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
61 // Note: This is a special bug reporting site for the JVM
62 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
63 #define DEFAULT_JAVA_LAUNCHER "generic"
64
65 char* Arguments::_jvm_flags_file = NULL;
66 char** Arguments::_jvm_flags_array = NULL;
67 int Arguments::_num_jvm_flags = 0;
68 char** Arguments::_jvm_args_array = NULL;
69 int Arguments::_num_jvm_args = 0;
70 char* Arguments::_java_command = NULL;
71 SystemProperty* Arguments::_system_properties = NULL;
72 const char* Arguments::_gc_log_filename = NULL;
73 bool Arguments::_has_profile = false;
74 size_t Arguments::_conservative_max_heap_alignment = 0;
75 size_t Arguments::_min_heap_size = 0;
76 Arguments::Mode Arguments::_mode = _mixed;
77 bool Arguments::_java_compiler = false;
78 bool Arguments::_xdebug_mode = false;
79 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
80 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
81 int Arguments::_sun_java_launcher_pid = -1;
82 bool Arguments::_sun_java_launcher_is_altjvm = false;
83
84 // These parameters are reset in method parse_vm_init_args()
85 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
86 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
87 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
88 bool Arguments::_ClipInlining = ClipInlining;
89 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
90 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
91
92 char* Arguments::SharedArchivePath = NULL;
93
94 AgentLibraryList Arguments::_libraryList;
95 AgentLibraryList Arguments::_agentList;
96
97 abort_hook_t Arguments::_abort_hook = NULL;
98 exit_hook_t Arguments::_exit_hook = NULL;
99 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
100
101
102 SystemProperty *Arguments::_sun_boot_library_path = NULL;
103 SystemProperty *Arguments::_java_library_path = NULL;
104 SystemProperty *Arguments::_java_home = NULL;
105 SystemProperty *Arguments::_java_class_path = NULL;
106 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
107
108 GrowableArray<ModuleXPatchPath*> *Arguments::_xpatchprefix = NULL;
109 PathString *Arguments::_system_boot_class_path = NULL;
110 bool Arguments::_has_jimage = false;
111
112 char* Arguments::_ext_dirs = NULL;
113
114 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
115 // part of the option string.
116 static bool match_option(const JavaVMOption *option, const char* name,
117 const char** tail) {
118 size_t len = strlen(name);
119 if (strncmp(option->optionString, name, len) == 0) {
120 *tail = option->optionString + len;
121 return true;
122 } else {
123 return false;
124 }
125 }
126
127 // Check if 'option' matches 'name'. No "tail" is allowed.
128 static bool match_option(const JavaVMOption *option, const char* name) {
129 const char* tail = NULL;
130 bool result = match_option(option, name, &tail);
131 if (tail != NULL && *tail == '\0') {
132 return result;
133 } else {
134 return false;
135 }
136 }
137
138 // Return true if any of the strings in null-terminated array 'names' matches.
139 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
140 // the option must match exactly.
141 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
142 bool tail_allowed) {
143 for (/* empty */; *names != NULL; ++names) {
144 if (match_option(option, *names, tail)) {
145 if (**tail == '\0' || tail_allowed && **tail == ':') {
146 return true;
147 }
148 }
149 }
150 return false;
151 }
152
153 static void logOption(const char* opt) {
154 if (PrintVMOptions) {
155 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
156 }
157 }
158
159 // Process java launcher properties.
160 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
161 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
162 // sun.java.launcher.pid is defined.
163 // Must do this before setting up other system properties,
164 // as some of them may depend on launcher type.
165 for (int index = 0; index < args->nOptions; index++) {
166 const JavaVMOption* option = args->options + index;
167 const char* tail;
168
169 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
170 process_java_launcher_argument(tail, option->extraInfo);
171 continue;
172 }
173 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
174 if (strcmp(tail, "true") == 0) {
175 _sun_java_launcher_is_altjvm = true;
176 }
177 continue;
178 }
179 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
180 _sun_java_launcher_pid = atoi(tail);
181 continue;
182 }
183 }
184 }
185
186 // Initialize system properties key and value.
187 void Arguments::init_system_properties() {
188
189 // Set up _system_boot_class_path which is not a property but
190 // relies heavily on argument processing and the jdk.boot.class.path.append
191 // property. It is used to store the underlying system boot class path.
192 _system_boot_class_path = new PathString(NULL);
193
194 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
195 "Java Virtual Machine Specification", false));
196 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
197 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
198 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
199 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
200
201 // Following are JVMTI agent writable properties.
202 // Properties values are set to NULL and they are
203 // os specific they are initialized in os::init_system_properties_values().
204 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
205 _java_library_path = new SystemProperty("java.library.path", NULL, true);
206 _java_home = new SystemProperty("java.home", NULL, true);
207 _java_class_path = new SystemProperty("java.class.path", "", true);
208 // jdk.boot.class.path.append is a non-writeable, internal property.
209 // It can only be set by either:
210 // - -Xbootclasspath/a:
211 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
212 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
213
214 // Add to System Property list.
215 PropertyList_add(&_system_properties, _sun_boot_library_path);
216 PropertyList_add(&_system_properties, _java_library_path);
217 PropertyList_add(&_system_properties, _java_home);
218 PropertyList_add(&_system_properties, _java_class_path);
219 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
220
221 // Set OS specific system properties values
222 os::init_system_properties_values();
223 }
224
225 // Update/Initialize System properties after JDK version number is known
226 void Arguments::init_version_specific_system_properties() {
227 enum { bufsz = 16 };
228 char buffer[bufsz];
229 const char* spec_vendor = "Oracle Corporation";
230 uint32_t spec_version = JDK_Version::current().major_version();
231
232 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
233
234 PropertyList_add(&_system_properties,
235 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
236 PropertyList_add(&_system_properties,
237 new SystemProperty("java.vm.specification.version", buffer, false));
238 PropertyList_add(&_system_properties,
239 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
240 }
241
242 /*
243 * -XX argument processing:
244 *
245 * -XX arguments are defined in several places, such as:
246 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
247 * -XX arguments are parsed in parse_argument().
248 * -XX argument bounds checking is done in check_vm_args_consistency().
249 *
250 * Over time -XX arguments may change. There are mechanisms to handle common cases:
251 *
252 * ALIASED: An option that is simply another name for another option. This is often
253 * part of the process of deprecating a flag, but not all aliases need
254 * to be deprecated.
255 *
256 * Create an alias for an option by adding the old and new option names to the
257 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
258 *
259 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
260 * support may be removed in the future. Both regular and aliased options may be
261 * deprecated.
262 *
263 * Add a deprecation warning for an option (or alias) by adding an entry in the
264 * "special_jvm_flags" table and setting the "deprecated_in" field.
265 * Often an option "deprecated" in one major release will
266 * be made "obsolete" in the next. In this case the entry should also have it's
267 * "obsolete_in" field set.
268 *
269 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
270 * on the command line. A warning is printed to let the user know that option might not
271 * be accepted in the future.
272 *
273 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
274 * table and setting the "obsolete_in" field.
275 *
276 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
277 * to the current JDK version. The system will flatly refuse to admit the existence of
278 * the flag. This allows a flag to die automatically over JDK releases.
279 *
280 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
281 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
282 * - Newly obsolete or expired deprecated options should have their global variable
283 * definitions removed (from globals.hpp, etc) and related implementations removed.
284 *
285 * Recommended approach for removing options:
286 *
287 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
288 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
289 *
290 * To remove internal options (e.g. diagnostic, experimental, develop options), use
291 * a 2-step model adding major release numbers to the obsolete and expire columns.
292 *
293 * To change the name of an option, use the alias table as well as a 2-step
294 * model adding major release numbers to the deprecate and expire columns.
295 * Think twice about aliasing commonly used customer options.
296 *
297 * There are times when it is appropriate to leave a future release number as undefined.
298 *
299 * Tests: Aliases should be tested in VMAliasOptions.java.
300 * Deprecated options should be tested in VMDeprecatedOptions.java.
301 */
302
303 // Obsolete or deprecated -XX flag.
304 typedef struct {
305 const char* name;
306 JDK_Version deprecated_in; // When the deprecation warning started (or "undefined").
307 JDK_Version obsolete_in; // When the obsolete warning started (or "undefined").
308 JDK_Version expired_in; // When the option expires (or "undefined").
309 } SpecialFlag;
310
311 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
312 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
313 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
314 // the command-line as usual, but will issue a warning.
315 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
316 // the command-line, while issuing a warning and ignoring the flag value.
317 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
318 // existence of the flag.
319 //
320 // MANUAL CLEANUP ON JDK VERSION UPDATES:
321 // This table ensures that the handling of options will update automatically when the JDK
322 // version is incremented, but the source code needs to be cleanup up manually:
323 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
324 // variable should be removed, as well as users of the variable.
325 // - As "deprecated" options age into "obsolete" options, move the entry into the
326 // "Obsolete Flags" section of the table.
327 // - All expired options should be removed from the table.
328 static SpecialFlag const special_jvm_flags[] = {
329 // -------------- Deprecated Flags --------------
330 // --- Non-alias flags - sorted by obsolete_in then expired_in:
331 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
332 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
333 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
334 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
335
336 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
337 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
338 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
339 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
340 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
341 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
342 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
343 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
344
345 // -------------- Obsolete Flags - sorted by expired_in --------------
346 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
347 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
348 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
349 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
350 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
351 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
352 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
353 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
354 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
355 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
356 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
357 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
358 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
359 #ifndef ZERO
360 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
361 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
362 #endif // ZERO
363 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
364 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
365 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
366 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
367 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
368 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
369 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
370 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
371 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
372 { "SegmentedHeapDumpThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
373 { "PrintOopAddress", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
374
375 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
376 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
377 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
378 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
379 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
380 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
381 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
382 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
383 #endif
384
385 { NULL, JDK_Version(0), JDK_Version(0) }
386 };
387
388 // Flags that are aliases for other flags.
389 typedef struct {
390 const char* alias_name;
391 const char* real_name;
392 } AliasedFlag;
393
394 static AliasedFlag const aliased_jvm_flags[] = {
395 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
396 { "CMSMarkStackSizeMax", "MarkStackSizeMax" },
397 { "CMSMarkStackSize", "MarkStackSize" },
398 { "G1MarkStackSize", "MarkStackSize" },
399 { "ParallelMarkingThreads", "ConcGCThreads" },
400 { "ParallelCMSThreads", "ConcGCThreads" },
401 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
402 { NULL, NULL}
403 };
404
405 // NOTE: A compatibility request will be necessary for each alias to be removed.
406 static AliasedLoggingFlag const aliased_logging_flags[] = {
407 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
408 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
409 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
410 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
411 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
412 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
413 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
414 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
415 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
416 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
417 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
418 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
419 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
420 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
421 };
422
423 #ifndef PRODUCT
424 // These options are removed in jdk9. Remove this code for jdk10.
425 static AliasedFlag const removed_develop_logging_flags[] = {
426 { "TraceClassInitialization", "-Xlog:class+init" },
427 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
428 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
429 { "TraceItables", "-Xlog:itables=debug" },
430 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
431 { "TraceSafepoint", "-Xlog:safepoint=debug" },
432 { "TraceStartupTime", "-Xlog:startuptime" },
433 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
434 { "PrintVtables", "-Xlog:vtables=debug" },
435 { "VerboseVerification", "-Xlog:verification" },
436 { NULL, NULL }
437 };
438 #endif //PRODUCT
439
440 // Return true if "v" is less than "other", where "other" may be "undefined".
441 static bool version_less_than(JDK_Version v, JDK_Version other) {
442 assert(!v.is_undefined(), "must be defined");
443 if (!other.is_undefined() && v.compare(other) >= 0) {
444 return false;
445 } else {
446 return true;
447 }
448 }
449
450 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
451 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
452 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
453 flag = special_jvm_flags[i];
454 return true;
455 }
456 }
457 return false;
458 }
459
460 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
461 assert(version != NULL, "Must provide a version buffer");
462 SpecialFlag flag;
463 if (lookup_special_flag(flag_name, flag)) {
464 if (!flag.obsolete_in.is_undefined()) {
465 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
466 *version = flag.obsolete_in;
467 return true;
468 }
469 }
470 }
471 return false;
472 }
473
474 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
475 assert(version != NULL, "Must provide a version buffer");
476 SpecialFlag flag;
477 if (lookup_special_flag(flag_name, flag)) {
478 if (!flag.deprecated_in.is_undefined()) {
479 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
480 version_less_than(JDK_Version::current(), flag.expired_in)) {
481 *version = flag.deprecated_in;
482 return 1;
483 } else {
484 return -1;
485 }
486 }
487 }
488 return 0;
489 }
490
491 #ifndef PRODUCT
492 const char* Arguments::removed_develop_logging_flag_name(const char* name){
493 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
494 const AliasedFlag& flag = removed_develop_logging_flags[i];
495 if (strcmp(flag.alias_name, name) == 0) {
496 return flag.real_name;
497 }
498 }
499 return NULL;
500 }
501 #endif // PRODUCT
502
503 const char* Arguments::real_flag_name(const char *flag_name) {
504 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
505 const AliasedFlag& flag_status = aliased_jvm_flags[i];
506 if (strcmp(flag_status.alias_name, flag_name) == 0) {
507 return flag_status.real_name;
508 }
509 }
510 return flag_name;
511 }
512
513 #ifdef ASSERT
514 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
515 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
516 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
517 return true;
518 }
519 }
520 return false;
521 }
522
523 static bool verify_special_jvm_flags() {
524 bool success = true;
525 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
526 const SpecialFlag& flag = special_jvm_flags[i];
527 if (lookup_special_flag(flag.name, i)) {
528 warning("Duplicate special flag declaration \"%s\"", flag.name);
529 success = false;
530 }
531 if (flag.deprecated_in.is_undefined() &&
532 flag.obsolete_in.is_undefined()) {
533 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
534 success = false;
535 }
536
537 if (!flag.deprecated_in.is_undefined()) {
538 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
539 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
540 success = false;
541 }
542
543 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
544 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
545 success = false;
546 }
547 }
548
549 if (!flag.obsolete_in.is_undefined()) {
550 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
551 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
552 success = false;
553 }
554
555 // if flag has become obsolete it should not have a "globals" flag defined anymore.
556 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
557 if (Flag::find_flag(flag.name) != NULL) {
558 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
559 success = false;
560 }
561 }
562 }
563
564 if (!flag.expired_in.is_undefined()) {
565 // if flag has become expired it should not have a "globals" flag defined anymore.
566 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
567 if (Flag::find_flag(flag.name) != NULL) {
568 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
569 success = false;
570 }
571 }
572 }
573
574 }
575 return success;
576 }
577 #endif
578
579 // Parses a size specification string.
580 bool Arguments::atojulong(const char *s, julong* result) {
581 julong n = 0;
582
583 // First char must be a digit. Don't allow negative numbers or leading spaces.
584 if (!isdigit(*s)) {
585 return false;
586 }
587
588 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
589 char* remainder;
590 errno = 0;
591 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
592 if (errno != 0) {
593 return false;
594 }
595
596 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
597 if (remainder == s || strlen(remainder) > 1) {
598 return false;
599 }
600
601 switch (*remainder) {
602 case 'T': case 't':
603 *result = n * G * K;
604 // Check for overflow.
605 if (*result/((julong)G * K) != n) return false;
606 return true;
607 case 'G': case 'g':
608 *result = n * G;
609 if (*result/G != n) return false;
610 return true;
611 case 'M': case 'm':
612 *result = n * M;
613 if (*result/M != n) return false;
614 return true;
615 case 'K': case 'k':
616 *result = n * K;
617 if (*result/K != n) return false;
618 return true;
619 case '\0':
620 *result = n;
621 return true;
622 default:
623 return false;
624 }
625 }
626
627 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
628 if (size < min_size) return arg_too_small;
629 // Check that size will fit in a size_t (only relevant on 32-bit)
630 if (size > max_uintx) return arg_too_big;
631 return arg_in_range;
632 }
633
634 // Describe an argument out of range error
635 void Arguments::describe_range_error(ArgsRange errcode) {
636 switch(errcode) {
637 case arg_too_big:
638 jio_fprintf(defaultStream::error_stream(),
639 "The specified size exceeds the maximum "
640 "representable size.\n");
641 break;
642 case arg_too_small:
643 case arg_unreadable:
644 case arg_in_range:
645 // do nothing for now
646 break;
647 default:
648 ShouldNotReachHere();
649 }
650 }
651
652 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
653 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
654 return true;
655 } else {
656 return false;
657 }
658 }
659
660 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
661 char* end;
662 errno = 0;
663 double v = strtod(value, &end);
664 if ((errno != 0) || (*end != 0)) {
665 return false;
666 }
667
668 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
669 return true;
670 }
671 return false;
672 }
673
674 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
675 julong v;
676 int int_v;
677 intx intx_v;
678 bool is_neg = false;
679 Flag* result = Flag::find_flag(name, strlen(name));
680
681 if (result == NULL) {
682 return false;
683 }
684
685 // Check the sign first since atojulong() parses only unsigned values.
686 if (*value == '-') {
687 if (!result->is_intx() && !result->is_int()) {
688 return false;
689 }
690 value++;
691 is_neg = true;
692 }
693 if (!Arguments::atojulong(value, &v)) {
694 return false;
695 }
696 if (result->is_int()) {
697 int_v = (int) v;
698 if (is_neg) {
699 int_v = -int_v;
700 }
701 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
702 } else if (result->is_uint()) {
703 uint uint_v = (uint) v;
704 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
705 } else if (result->is_intx()) {
706 intx_v = (intx) v;
707 if (is_neg) {
708 intx_v = -intx_v;
709 }
710 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
711 } else if (result->is_uintx()) {
712 uintx uintx_v = (uintx) v;
713 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
714 } else if (result->is_uint64_t()) {
715 uint64_t uint64_t_v = (uint64_t) v;
716 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
717 } else if (result->is_size_t()) {
718 size_t size_t_v = (size_t) v;
719 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
720 } else {
721 return false;
722 }
723 }
724
725 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
726 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
727 // Contract: CommandLineFlags always returns a pointer that needs freeing.
728 FREE_C_HEAP_ARRAY(char, value);
729 return true;
730 }
731
732 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
733 const char* old_value = "";
734 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
735 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
736 size_t new_len = strlen(new_value);
737 const char* value;
738 char* free_this_too = NULL;
739 if (old_len == 0) {
740 value = new_value;
741 } else if (new_len == 0) {
742 value = old_value;
743 } else {
744 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtArguments);
745 // each new setting adds another LINE to the switch:
746 sprintf(buf, "%s\n%s", old_value, new_value);
747 value = buf;
748 free_this_too = buf;
749 }
750 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
751 // CommandLineFlags always returns a pointer that needs freeing.
752 FREE_C_HEAP_ARRAY(char, value);
753 if (free_this_too != NULL) {
754 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
755 FREE_C_HEAP_ARRAY(char, free_this_too);
756 }
757 return true;
758 }
759
760 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
761 const char* real_name = real_flag_name(arg);
762 JDK_Version since = JDK_Version();
763 switch (is_deprecated_flag(arg, &since)) {
764 case -1:
765 return NULL; // obsolete or expired, don't process normally
766 case 0:
767 return real_name;
768 case 1: {
769 if (warn) {
770 char version[256];
771 since.to_string(version, sizeof(version));
772 if (real_name != arg) {
773 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
774 arg, version, real_name);
775 } else {
776 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
777 arg, version);
778 }
779 }
780 return real_name;
781 }
782 }
783 ShouldNotReachHere();
784 return NULL;
785 }
786
787 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
788 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
789 // Set tagset string buffer at max size of 256, large enough for any alias tagset
790 const int max_tagset_size = 256;
791 int max_tagset_len = max_tagset_size - 1;
792 char tagset_buffer[max_tagset_size];
793 tagset_buffer[0] = '\0';
794
795 // Write tag-set for aliased logging option, in string list form
796 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
797 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
798 if (i > 0) {
799 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
800 }
801 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
802 }
803 if (!alf.exactMatch) {
804 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
805 }
806 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
807 (on) ? "+" : "-",
808 name,
809 tagset_buffer,
810 (on) ? LogLevel::name(alf.level) : "off");
811 }
812
813 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
814 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
815 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
816 if (strcmp(alf.alias_name, name) == 0) {
817 log_deprecated_flag(name, on, alf);
818 return alf;
819 }
820 }
821 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
822 return a;
823 }
824
825 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
826
827 // range of acceptable characters spelled out for portability reasons
828 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
829 #define BUFLEN 255
830 char name[BUFLEN+1];
831 char dummy;
832 const char* real_name;
833 bool warn_if_deprecated = true;
834
835 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
836 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
837 if (alf.alias_name != NULL){
838 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
839 return true;
840 }
841 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
842 if (real_name == NULL) {
843 return false;
844 }
845 return set_bool_flag(real_name, false, origin);
846 }
847 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
848 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
849 if (alf.alias_name != NULL){
850 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
851 return true;
852 }
853 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
854 if (real_name == NULL) {
855 return false;
856 }
857 return set_bool_flag(real_name, true, origin);
858 }
859
860 char punct;
861 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
862 const char* value = strchr(arg, '=') + 1;
863 Flag* flag;
864
865 // this scanf pattern matches both strings (handled here) and numbers (handled later))
866 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
867 if (alf.alias_name != NULL) {
868 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
869 return true;
870 }
871 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
872 if (real_name == NULL) {
873 return false;
874 }
875 flag = Flag::find_flag(real_name);
876 if (flag != NULL && flag->is_ccstr()) {
877 if (flag->ccstr_accumulates()) {
878 return append_to_string_flag(real_name, value, origin);
879 } else {
880 if (value[0] == '\0') {
881 value = NULL;
882 }
883 return set_string_flag(real_name, value, origin);
884 }
885 } else {
886 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
887 }
888 }
889
890 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
891 const char* value = strchr(arg, '=') + 1;
892 // -XX:Foo:=xxx will reset the string flag to the given value.
893 if (value[0] == '\0') {
894 value = NULL;
895 }
896 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
897 if (real_name == NULL) {
898 return false;
899 }
900 return set_string_flag(real_name, value, origin);
901 }
902
903 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
904 #define SIGNED_NUMBER_RANGE "[-0123456789]"
905 #define NUMBER_RANGE "[0123456789eE+-]"
906 char value[BUFLEN + 1];
907 char value2[BUFLEN + 1];
908 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
909 // Looks like a floating-point number -- try again with more lenient format string
910 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
911 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
912 if (real_name == NULL) {
913 return false;
914 }
915 return set_fp_numeric_flag(real_name, value, origin);
916 }
917 }
918
919 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
920 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
921 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
922 if (real_name == NULL) {
923 return false;
924 }
925 return set_numeric_flag(real_name, value, origin);
926 }
927
928 return false;
929 }
930
931 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
932 assert(bldarray != NULL, "illegal argument");
933
934 if (arg == NULL) {
935 return;
936 }
937
938 int new_count = *count + 1;
939
940 // expand the array and add arg to the last element
941 if (*bldarray == NULL) {
942 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
943 } else {
944 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
945 }
946 (*bldarray)[*count] = os::strdup_check_oom(arg);
947 *count = new_count;
948 }
949
950 void Arguments::build_jvm_args(const char* arg) {
951 add_string(&_jvm_args_array, &_num_jvm_args, arg);
952 }
953
954 void Arguments::build_jvm_flags(const char* arg) {
955 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
956 }
957
958 // utility function to return a string that concatenates all
959 // strings in a given char** array
960 const char* Arguments::build_resource_string(char** args, int count) {
961 if (args == NULL || count == 0) {
962 return NULL;
963 }
964 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
965 for (int i = 1; i < count; i++) {
966 length += strlen(args[i]) + 1; // add 1 for a space
967 }
968 char* s = NEW_RESOURCE_ARRAY(char, length);
969 strcpy(s, args[0]);
970 for (int j = 1; j < count; j++) {
971 strcat(s, " ");
972 strcat(s, args[j]);
973 }
974 return (const char*) s;
975 }
976
977 void Arguments::print_on(outputStream* st) {
978 st->print_cr("VM Arguments:");
979 if (num_jvm_flags() > 0) {
980 st->print("jvm_flags: "); print_jvm_flags_on(st);
981 st->cr();
982 }
983 if (num_jvm_args() > 0) {
984 st->print("jvm_args: "); print_jvm_args_on(st);
985 st->cr();
986 }
987 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
988 if (_java_class_path != NULL) {
989 char* path = _java_class_path->value();
990 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
991 }
992 st->print_cr("Launcher Type: %s", _sun_java_launcher);
993 }
994
995 void Arguments::print_summary_on(outputStream* st) {
996 // Print the command line. Environment variables that are helpful for
997 // reproducing the problem are written later in the hs_err file.
998 // flags are from setting file
999 if (num_jvm_flags() > 0) {
1000 st->print_raw("Settings File: ");
1001 print_jvm_flags_on(st);
1002 st->cr();
1003 }
1004 // args are the command line and environment variable arguments.
1005 st->print_raw("Command Line: ");
1006 if (num_jvm_args() > 0) {
1007 print_jvm_args_on(st);
1008 }
1009 // this is the classfile and any arguments to the java program
1010 if (java_command() != NULL) {
1011 st->print("%s", java_command());
1012 }
1013 st->cr();
1014 }
1015
1016 void Arguments::print_jvm_flags_on(outputStream* st) {
1017 if (_num_jvm_flags > 0) {
1018 for (int i=0; i < _num_jvm_flags; i++) {
1019 st->print("%s ", _jvm_flags_array[i]);
1020 }
1021 }
1022 }
1023
1024 void Arguments::print_jvm_args_on(outputStream* st) {
1025 if (_num_jvm_args > 0) {
1026 for (int i=0; i < _num_jvm_args; i++) {
1027 st->print("%s ", _jvm_args_array[i]);
1028 }
1029 }
1030 }
1031
1032 bool Arguments::process_argument(const char* arg,
1033 jboolean ignore_unrecognized,
1034 Flag::Flags origin) {
1035 JDK_Version since = JDK_Version();
1036
1037 if (parse_argument(arg, origin)) {
1038 return true;
1039 }
1040
1041 // Determine if the flag has '+', '-', or '=' characters.
1042 bool has_plus_minus = (*arg == '+' || *arg == '-');
1043 const char* const argname = has_plus_minus ? arg + 1 : arg;
1044
1045 size_t arg_len;
1046 const char* equal_sign = strchr(argname, '=');
1047 if (equal_sign == NULL) {
1048 arg_len = strlen(argname);
1049 } else {
1050 arg_len = equal_sign - argname;
1051 }
1052
1053 // Only make the obsolete check for valid arguments.
1054 if (arg_len <= BUFLEN) {
1055 // Construct a string which consists only of the argument name without '+', '-', or '='.
1056 char stripped_argname[BUFLEN+1];
1057 strncpy(stripped_argname, argname, arg_len);
1058 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate.
1059 if (is_obsolete_flag(stripped_argname, &since)) {
1060 char version[256];
1061 since.to_string(version, sizeof(version));
1062 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1063 return true;
1064 }
1065 #ifndef PRODUCT
1066 else {
1067 const char* replacement;
1068 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1069 log_warning(arguments)("%s has been removed. Please use %s instead.",
1070 stripped_argname,
1071 replacement);
1072 return false;
1073 }
1074 }
1075 #endif //PRODUCT
1076 }
1077
1078 // For locked flags, report a custom error message if available.
1079 // Otherwise, report the standard unrecognized VM option.
1080 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1081 if (found_flag != NULL) {
1082 char locked_message_buf[BUFLEN];
1083 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1084 if (strlen(locked_message_buf) == 0) {
1085 if (found_flag->is_bool() && !has_plus_minus) {
1086 jio_fprintf(defaultStream::error_stream(),
1087 "Missing +/- setting for VM option '%s'\n", argname);
1088 } else if (!found_flag->is_bool() && has_plus_minus) {
1089 jio_fprintf(defaultStream::error_stream(),
1090 "Unexpected +/- setting in VM option '%s'\n", argname);
1091 } else {
1092 jio_fprintf(defaultStream::error_stream(),
1093 "Improperly specified VM option '%s'\n", argname);
1094 }
1095 } else {
1096 #ifdef PRODUCT
1097 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1098 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1099 if (ignore_unrecognized && mismatched) {
1100 return true;
1101 }
1102 #endif
1103 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1104 }
1105 } else {
1106 if (ignore_unrecognized) {
1107 return true;
1108 }
1109 jio_fprintf(defaultStream::error_stream(),
1110 "Unrecognized VM option '%s'\n", argname);
1111 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1112 if (fuzzy_matched != NULL) {
1113 jio_fprintf(defaultStream::error_stream(),
1114 "Did you mean '%s%s%s'? ",
1115 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1116 fuzzy_matched->_name,
1117 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1118 }
1119 }
1120
1121 // allow for commandline "commenting out" options like -XX:#+Verbose
1122 return arg[0] == '#';
1123 }
1124
1125 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1126 FILE* stream = fopen(file_name, "rb");
1127 if (stream == NULL) {
1128 if (should_exist) {
1129 jio_fprintf(defaultStream::error_stream(),
1130 "Could not open settings file %s\n", file_name);
1131 return false;
1132 } else {
1133 return true;
1134 }
1135 }
1136
1137 char token[1024];
1138 int pos = 0;
1139
1140 bool in_white_space = true;
1141 bool in_comment = false;
1142 bool in_quote = false;
1143 char quote_c = 0;
1144 bool result = true;
1145
1146 int c = getc(stream);
1147 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1148 if (in_white_space) {
1149 if (in_comment) {
1150 if (c == '\n') in_comment = false;
1151 } else {
1152 if (c == '#') in_comment = true;
1153 else if (!isspace(c)) {
1154 in_white_space = false;
1155 token[pos++] = c;
1156 }
1157 }
1158 } else {
1159 if (c == '\n' || (!in_quote && isspace(c))) {
1160 // token ends at newline, or at unquoted whitespace
1161 // this allows a way to include spaces in string-valued options
1162 token[pos] = '\0';
1163 logOption(token);
1164 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1165 build_jvm_flags(token);
1166 pos = 0;
1167 in_white_space = true;
1168 in_quote = false;
1169 } else if (!in_quote && (c == '\'' || c == '"')) {
1170 in_quote = true;
1171 quote_c = c;
1172 } else if (in_quote && (c == quote_c)) {
1173 in_quote = false;
1174 } else {
1175 token[pos++] = c;
1176 }
1177 }
1178 c = getc(stream);
1179 }
1180 if (pos > 0) {
1181 token[pos] = '\0';
1182 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1183 build_jvm_flags(token);
1184 }
1185 fclose(stream);
1186 return result;
1187 }
1188
1189 //=============================================================================================================
1190 // Parsing of properties (-D)
1191
1192 const char* Arguments::get_property(const char* key) {
1193 return PropertyList_get_value(system_properties(), key);
1194 }
1195
1196 bool Arguments::add_property(const char* prop) {
1197 const char* eq = strchr(prop, '=');
1198 const char* key;
1199 const char* value = "";
1200
1201 if (eq == NULL) {
1202 // property doesn't have a value, thus use passed string
1203 key = prop;
1204 } else {
1205 // property have a value, thus extract it and save to the
1206 // allocated string
1207 size_t key_len = eq - prop;
1208 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1209
1210 strncpy(tmp_key, prop, key_len);
1211 tmp_key[key_len] = '\0';
1212 key = tmp_key;
1213
1214 value = &prop[key_len + 1];
1215 }
1216
1217 if (strcmp(key, "java.compiler") == 0) {
1218 process_java_compiler_argument(value);
1219 // Record value in Arguments, but let it get passed to Java.
1220 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1221 strcmp(key, "sun.java.launcher.pid") == 0) {
1222 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1223 // private and are processed in process_sun_java_launcher_properties();
1224 // the sun.java.launcher property is passed on to the java application
1225 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1226 PropertyList_unique_add(&_system_properties, key, value, true);
1227 } else {
1228 if (strcmp(key, "sun.java.command") == 0) {
1229 char *old_java_command = _java_command;
1230 _java_command = os::strdup_check_oom(value, mtArguments);
1231 if (old_java_command != NULL) {
1232 os::free(old_java_command);
1233 }
1234 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1235 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1236 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1237 // its value without going through the property list or making a Java call.
1238 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1239 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1240 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1241 os::free((void *)old_java_vendor_url_bug);
1242 }
1243 }
1244
1245 // Create new property and add at the end of the list
1246 PropertyList_unique_add(&_system_properties, key, value);
1247 }
1248
1249 if (key != prop) {
1250 // SystemProperty copy passed value, thus free previously allocated
1251 // memory
1252 FreeHeap((void *)key);
1253 }
1254
1255 return true;
1256 }
1257
1258 // sets or adds a module name to the jdk.launcher.addmods property
1259 bool Arguments::append_to_addmods_property(const char* module_name) {
1260 const char* key = "jdk.launcher.addmods";
1261 const char* old_value = Arguments::get_property(key);
1262 size_t buf_len = strlen(key) + strlen(module_name) + 2;
1263 if (old_value != NULL) {
1264 buf_len += strlen(old_value) + 1;
1265 }
1266 char* new_value = AllocateHeap(buf_len, mtArguments);
1267 if (new_value == NULL) {
1268 return false;
1269 }
1270 if (old_value == NULL) {
1271 jio_snprintf(new_value, buf_len, "%s=%s", key, module_name);
1272 } else {
1273 jio_snprintf(new_value, buf_len, "%s=%s,%s", key, old_value, module_name);
1274 }
1275 bool added = add_property(new_value);
1276 FreeHeap(new_value);
1277 return added;
1278 }
1279
1280 #if INCLUDE_CDS
1281 void Arguments::check_unsupported_dumping_properties() {
1282 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1283 const char* unsupported_properties[5] = { "jdk.module.main",
1284 "jdk.module.path",
1285 "jdk.upgrade.module.path",
1286 "jdk.launcher.addmods",
1287 "jdk.launcher.limitmods" };
1288 const char* unsupported_options[5] = { "-m",
1289 "-modulepath",
1290 "-upgrademodulepath",
1291 "-addmods",
1292 "-limitmods" };
1293 SystemProperty* sp = system_properties();
1294 while (sp != NULL) {
1295 for (int i = 0; i < 5; i++) {
1296 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1297 vm_exit_during_initialization(
1298 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1299 }
1300 }
1301 sp = sp->next();
1302 }
1303
1304 // Check for an exploded module build in use with -Xshare:dump.
1305 if (!has_jimage()) {
1306 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1307 }
1308 }
1309 #endif
1310
1311 //===========================================================================================================
1312 // Setting int/mixed/comp mode flags
1313
1314 void Arguments::set_mode_flags(Mode mode) {
1315 // Set up default values for all flags.
1316 // If you add a flag to any of the branches below,
1317 // add a default value for it here.
1318 set_java_compiler(false);
1319 _mode = mode;
1320
1321 // Ensure Agent_OnLoad has the correct initial values.
1322 // This may not be the final mode; mode may change later in onload phase.
1323 PropertyList_unique_add(&_system_properties, "java.vm.info",
1324 VM_Version::vm_info_string(), false);
1325
1326 UseInterpreter = true;
1327 UseCompiler = true;
1328 UseLoopCounter = true;
1329
1330 // Default values may be platform/compiler dependent -
1331 // use the saved values
1332 ClipInlining = Arguments::_ClipInlining;
1333 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1334 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1335 BackgroundCompilation = Arguments::_BackgroundCompilation;
1336 if (TieredCompilation) {
1337 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1338 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1339 }
1340 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1341 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1342 }
1343 }
1344
1345 // Change from defaults based on mode
1346 switch (mode) {
1347 default:
1348 ShouldNotReachHere();
1349 break;
1350 case _int:
1351 UseCompiler = false;
1352 UseLoopCounter = false;
1353 AlwaysCompileLoopMethods = false;
1354 UseOnStackReplacement = false;
1355 break;
1356 case _mixed:
1357 // same as default
1358 break;
1359 case _comp:
1360 UseInterpreter = false;
1361 BackgroundCompilation = false;
1362 ClipInlining = false;
1363 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1364 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1365 // compile a level 4 (C2) and then continue executing it.
1366 if (TieredCompilation) {
1367 Tier3InvokeNotifyFreqLog = 0;
1368 Tier4InvocationThreshold = 0;
1369 }
1370 break;
1371 }
1372 }
1373
1374 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS
1375 // Conflict: required to use shared spaces (-Xshare:on), but
1376 // incompatible command line options were chosen.
1377
1378 static void no_shared_spaces(const char* message) {
1379 if (RequireSharedSpaces) {
1380 jio_fprintf(defaultStream::error_stream(),
1381 "Class data sharing is inconsistent with other specified options.\n");
1382 vm_exit_during_initialization("Unable to use shared archive.", message);
1383 } else {
1384 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1385 }
1386 }
1387 #endif
1388
1389 // Returns threshold scaled with the value of scale.
1390 // If scale < 0.0, threshold is returned without scaling.
1391 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1392 if (scale == 1.0 || scale < 0.0) {
1393 return threshold;
1394 } else {
1395 return (intx)(threshold * scale);
1396 }
1397 }
1398
1399 // Returns freq_log scaled with the value of scale.
1400 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1401 // If scale < 0.0, freq_log is returned without scaling.
1402 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1403 // Check if scaling is necessary or if negative value was specified.
1404 if (scale == 1.0 || scale < 0.0) {
1405 return freq_log;
1406 }
1407 // Check values to avoid calculating log2 of 0.
1408 if (scale == 0.0 || freq_log == 0) {
1409 return 0;
1410 }
1411 // Determine the maximum notification frequency value currently supported.
1412 // The largest mask value that the interpreter/C1 can handle is
1413 // of length InvocationCounter::number_of_count_bits. Mask values are always
1414 // one bit shorter then the value of the notification frequency. Set
1415 // max_freq_bits accordingly.
1416 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1417 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1418 if (scaled_freq == 0) {
1419 // Return 0 right away to avoid calculating log2 of 0.
1420 return 0;
1421 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1422 return max_freq_bits;
1423 } else {
1424 return log2_intptr(scaled_freq);
1425 }
1426 }
1427
1428 void Arguments::set_tiered_flags() {
1429 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1430 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1431 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1432 }
1433 if (CompilationPolicyChoice < 2) {
1434 vm_exit_during_initialization(
1435 "Incompatible compilation policy selected", NULL);
1436 }
1437 // Increase the code cache size - tiered compiles a lot more.
1438 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1439 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1440 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1441 }
1442 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1443 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1444 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1445 }
1446 if (!UseInterpreter) { // -Xcomp
1447 Tier3InvokeNotifyFreqLog = 0;
1448 Tier4InvocationThreshold = 0;
1449 }
1450
1451 if (CompileThresholdScaling < 0) {
1452 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1453 }
1454
1455 // Scale tiered compilation thresholds.
1456 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1457 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1458 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1459 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1460
1461 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1462 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1463 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1464 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1465
1466 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1467 // once these thresholds become supported.
1468
1469 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1470 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1471
1472 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1473 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1474
1475 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1476
1477 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1478 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1479 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1480 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1481 }
1482 }
1483
1484 void set_object_alignment() {
1485 // Object alignment.
1486 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1487 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1488 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1489 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1490 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1491 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1492
1493 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1494 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1495
1496 // Oop encoding heap max
1497 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1498
1499 if (SurvivorAlignmentInBytes == 0) {
1500 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1501 }
1502
1503 }
1504
1505 size_t Arguments::max_heap_for_compressed_oops() {
1506 // Avoid sign flip.
1507 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1508 // We need to fit both the NULL page and the heap into the memory budget, while
1509 // keeping alignment constraints of the heap. To guarantee the latter, as the
1510 // NULL page is located before the heap, we pad the NULL page to the conservative
1511 // maximum alignment that the GC may ever impose upon the heap.
1512 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1513 _conservative_max_heap_alignment);
1514
1515 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1516 NOT_LP64(ShouldNotReachHere(); return 0);
1517 }
1518
1519 bool Arguments::should_auto_select_low_pause_collector() {
1520 if (UseAutoGCSelectPolicy &&
1521 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1522 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1523 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1524 return true;
1525 }
1526 return false;
1527 }
1528
1529 void Arguments::set_use_compressed_oops() {
1530 #ifndef ZERO
1531 #ifdef _LP64
1532 // MaxHeapSize is not set up properly at this point, but
1533 // the only value that can override MaxHeapSize if we are
1534 // to use UseCompressedOops is InitialHeapSize.
1535 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1536
1537 if (max_heap_size <= max_heap_for_compressed_oops()) {
1538 #if !defined(COMPILER1) || defined(TIERED)
1539 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1540 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1541 }
1542 #endif
1543 } else {
1544 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1545 warning("Max heap size too large for Compressed Oops");
1546 FLAG_SET_DEFAULT(UseCompressedOops, false);
1547 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1548 }
1549 }
1550 #endif // _LP64
1551 #endif // ZERO
1552 }
1553
1554
1555 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1556 // set_use_compressed_oops().
1557 void Arguments::set_use_compressed_klass_ptrs() {
1558 #ifndef ZERO
1559 #ifdef _LP64
1560 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1561 if (!UseCompressedOops) {
1562 if (UseCompressedClassPointers) {
1563 warning("UseCompressedClassPointers requires UseCompressedOops");
1564 }
1565 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1566 } else {
1567 // Turn on UseCompressedClassPointers too
1568 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1569 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1570 }
1571 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1572 if (UseCompressedClassPointers) {
1573 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1574 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1575 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1576 }
1577 }
1578 }
1579 #endif // _LP64
1580 #endif // !ZERO
1581 }
1582
1583 void Arguments::set_conservative_max_heap_alignment() {
1584 // The conservative maximum required alignment for the heap is the maximum of
1585 // the alignments imposed by several sources: any requirements from the heap
1586 // itself, the collector policy and the maximum page size we may run the VM
1587 // with.
1588 size_t heap_alignment = GC::gc()->conservative_max_heap_alignment();
1589 _conservative_max_heap_alignment = MAX4(heap_alignment,
1590 (size_t)os::vm_allocation_granularity(),
1591 os::max_page_size(),
1592 CollectorPolicy::compute_heap_alignment());
1593 }
1594
1595 bool Arguments::gc_selected() {
1596 #if INCLUDE_ALL_GCS
1597 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC;
1598 #else
1599 return UseSerialGC;
1600 #endif // INCLUDE_ALL_GCS
1601 }
1602
1603 void Arguments::select_gc_ergonomically() {
1604 #if INCLUDE_ALL_GCS
1605 if (os::is_server_class_machine()) {
1606 if (should_auto_select_low_pause_collector()) {
1607 FLAG_SET_ERGO_IF_DEFAULT(bool, UseConcMarkSweepGC, true);
1608 } else {
1609 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
1610 }
1611 } else {
1612 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1613 }
1614 #else
1615 UNSUPPORTED_OPTION(UseG1GC);
1616 UNSUPPORTED_OPTION(UseParallelGC);
1617 UNSUPPORTED_OPTION(UseParallelOldGC);
1618 UNSUPPORTED_OPTION(UseConcMarkSweepGC);
1619 UNSUPPORTED_OPTION(UseParNewGC);
1620 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1621 #endif // INCLUDE_ALL_GCS
1622 }
1623
1624 void Arguments::select_gc() {
1625 if (!gc_selected()) {
1626 select_gc_ergonomically();
1627 if (!gc_selected()) {
1628 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL);
1629 }
1630 }
1631 }
1632
1633 void Arguments::set_ergonomics_flags() {
1634
1635 #if defined(COMPILER2) || INCLUDE_JVMCI
1636 // Shared spaces work fine with other GCs but causes bytecode rewriting
1637 // to be disabled, which hurts interpreter performance and decreases
1638 // server performance. When -server is specified, keep the default off
1639 // unless it is asked for. Future work: either add bytecode rewriting
1640 // at link time, or rewrite bytecodes in non-shared methods.
1641 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1642 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1643 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1644 }
1645 #endif
1646
1647 set_conservative_max_heap_alignment();
1648
1649 #ifndef ZERO
1650 #ifdef _LP64
1651 set_use_compressed_oops();
1652
1653 // set_use_compressed_klass_ptrs() must be called after calling
1654 // set_use_compressed_oops().
1655 set_use_compressed_klass_ptrs();
1656
1657 // Also checks that certain machines are slower with compressed oops
1658 // in vm_version initialization code.
1659 #endif // _LP64
1660 #endif // !ZERO
1661
1662 CodeCacheExtensions::set_ergonomics_flags();
1663 }
1664
1665 void Arguments::set_gc_specific_flags() {
1666 GC::gc()->initialize_flags();
1667 #ifdef INCLUDE_ALL_GCS
1668 if (AssumeMP && !UseSerialGC) {
1669 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1670 warning("If the number of processors is expected to increase from one, then"
1671 " you should configure the number of parallel GC threads appropriately"
1672 " using -XX:ParallelGCThreads=N");
1673 }
1674 }
1675 if (MinHeapFreeRatio == 100) {
1676 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1677 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1678 }
1679 #endif // INCLUDE_ALL_GCS
1680 }
1681
1682 julong Arguments::limit_by_allocatable_memory(julong limit) {
1683 julong max_allocatable;
1684 julong result = limit;
1685 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1686 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1687 }
1688 return result;
1689 }
1690
1691 // Use static initialization to get the default before parsing
1692 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1693
1694 void Arguments::set_heap_size() {
1695 const julong phys_mem =
1696 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1697 : (julong)MaxRAM;
1698
1699 // If the maximum heap size has not been set with -Xmx,
1700 // then set it as fraction of the size of physical memory,
1701 // respecting the maximum and minimum sizes of the heap.
1702 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1703 julong reasonable_max = phys_mem / MaxRAMFraction;
1704
1705 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1706 // Small physical memory, so use a minimum fraction of it for the heap
1707 reasonable_max = phys_mem / MinRAMFraction;
1708 } else {
1709 // Not-small physical memory, so require a heap at least
1710 // as large as MaxHeapSize
1711 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1712 }
1713 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1714 // Limit the heap size to ErgoHeapSizeLimit
1715 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1716 }
1717 if (UseCompressedOops) {
1718 // Limit the heap size to the maximum possible when using compressed oops
1719 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1720
1721 // HeapBaseMinAddress can be greater than default but not less than.
1722 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1723 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1724 // matches compressed oops printing flags
1725 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1726 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1727 DefaultHeapBaseMinAddress,
1728 DefaultHeapBaseMinAddress/G,
1729 HeapBaseMinAddress);
1730 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1731 }
1732 }
1733
1734 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1735 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1736 // but it should be not less than default MaxHeapSize.
1737 max_coop_heap -= HeapBaseMinAddress;
1738 }
1739 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1740 }
1741 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1742
1743 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1744 // An initial heap size was specified on the command line,
1745 // so be sure that the maximum size is consistent. Done
1746 // after call to limit_by_allocatable_memory because that
1747 // method might reduce the allocation size.
1748 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1749 }
1750
1751 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1752 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1753 }
1754
1755 // If the minimum or initial heap_size have not been set or requested to be set
1756 // ergonomically, set them accordingly.
1757 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1758 julong reasonable_minimum = (julong)(OldSize + NewSize);
1759
1760 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1761
1762 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1763
1764 if (InitialHeapSize == 0) {
1765 julong reasonable_initial = phys_mem / InitialRAMFraction;
1766
1767 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1768 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1769
1770 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1771
1772 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1773 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1774 }
1775 // If the minimum heap size has not been set (via -Xms),
1776 // synchronize with InitialHeapSize to avoid errors with the default value.
1777 if (min_heap_size() == 0) {
1778 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1779 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1780 }
1781 }
1782 }
1783
1784 // This option inspects the machine and attempts to set various
1785 // parameters to be optimal for long-running, memory allocation
1786 // intensive jobs. It is intended for machines with large
1787 // amounts of cpu and memory.
1788 jint Arguments::set_aggressive_heap_flags() {
1789 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1790 // VM, but we may not be able to represent the total physical memory
1791 // available (like having 8gb of memory on a box but using a 32bit VM).
1792 // Thus, we need to make sure we're using a julong for intermediate
1793 // calculations.
1794 julong initHeapSize;
1795 julong total_memory = os::physical_memory();
1796
1797 if (total_memory < (julong) 256 * M) {
1798 jio_fprintf(defaultStream::error_stream(),
1799 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1800 vm_exit(1);
1801 }
1802
1803 // The heap size is half of available memory, or (at most)
1804 // all of possible memory less 160mb (leaving room for the OS
1805 // when using ISM). This is the maximum; because adaptive sizing
1806 // is turned on below, the actual space used may be smaller.
1807
1808 initHeapSize = MIN2(total_memory / (julong) 2,
1809 total_memory - (julong) 160 * M);
1810
1811 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1812
1813 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1814 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
1815 return JNI_EINVAL;
1816 }
1817 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
1818 return JNI_EINVAL;
1819 }
1820 // Currently the minimum size and the initial heap sizes are the same.
1821 set_min_heap_size(initHeapSize);
1822 }
1823 if (FLAG_IS_DEFAULT(NewSize)) {
1824 // Make the young generation 3/8ths of the total heap.
1825 if (FLAG_SET_CMDLINE(size_t, NewSize,
1826 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
1827 return JNI_EINVAL;
1828 }
1829 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
1830 return JNI_EINVAL;
1831 }
1832 }
1833
1834 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1835 FLAG_SET_DEFAULT(UseLargePages, true);
1836 #endif
1837
1838 // Increase some data structure sizes for efficiency
1839 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
1840 return JNI_EINVAL;
1841 }
1842 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
1843 return JNI_EINVAL;
1844 }
1845 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
1846 return JNI_EINVAL;
1847 }
1848
1849 // See the OldPLABSize comment below, but replace 'after promotion'
1850 // with 'after copying'. YoungPLABSize is the size of the survivor
1851 // space per-gc-thread buffers. The default is 4kw.
1852 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
1853 return JNI_EINVAL;
1854 }
1855
1856 // OldPLABSize is the size of the buffers in the old gen that
1857 // UseParallelGC uses to promote live data that doesn't fit in the
1858 // survivor spaces. At any given time, there's one for each gc thread.
1859 // The default size is 1kw. These buffers are rarely used, since the
1860 // survivor spaces are usually big enough. For specjbb, however, there
1861 // are occasions when there's lots of live data in the young gen
1862 // and we end up promoting some of it. We don't have a definite
1863 // explanation for why bumping OldPLABSize helps, but the theory
1864 // is that a bigger PLAB results in retaining something like the
1865 // original allocation order after promotion, which improves mutator
1866 // locality. A minor effect may be that larger PLABs reduce the
1867 // number of PLAB allocation events during gc. The value of 8kw
1868 // was arrived at by experimenting with specjbb.
1869 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
1870 return JNI_EINVAL;
1871 }
1872
1873 // Enable parallel GC and adaptive generation sizing
1874 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
1875 return JNI_EINVAL;
1876 }
1877 FLAG_SET_DEFAULT(ParallelGCThreads,
1878 Abstract_VM_Version::parallel_worker_threads());
1879
1880 // Encourage steady state memory management
1881 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
1882 return JNI_EINVAL;
1883 }
1884
1885 // This appears to improve mutator locality
1886 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
1887 return JNI_EINVAL;
1888 }
1889
1890 // Get around early Solaris scheduling bug
1891 // (affinity vs other jobs on system)
1892 // but disallow DR and offlining (5008695).
1893 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
1894 return JNI_EINVAL;
1895 }
1896
1897 return JNI_OK;
1898 }
1899
1900 // This must be called after ergonomics.
1901 void Arguments::set_bytecode_flags() {
1902 if (!RewriteBytecodes) {
1903 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1904 }
1905 }
1906
1907 // Aggressive optimization flags -XX:+AggressiveOpts
1908 jint Arguments::set_aggressive_opts_flags() {
1909 #ifdef COMPILER2
1910 if (AggressiveUnboxing) {
1911 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1912 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1913 } else if (!EliminateAutoBox) {
1914 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1915 AggressiveUnboxing = false;
1916 }
1917 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1918 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1919 } else if (!DoEscapeAnalysis) {
1920 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1921 AggressiveUnboxing = false;
1922 }
1923 }
1924 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1925 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1926 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1927 }
1928 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1929 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1930 }
1931
1932 // Feed the cache size setting into the JDK
1933 char buffer[1024];
1934 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1935 if (!add_property(buffer)) {
1936 return JNI_ENOMEM;
1937 }
1938 }
1939 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1940 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1941 }
1942 #endif
1943
1944 if (AggressiveOpts) {
1945 // Sample flag setting code
1946 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1947 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1948 // }
1949 }
1950
1951 return JNI_OK;
1952 }
1953
1954 //===========================================================================================================
1955 // Parsing of java.compiler property
1956
1957 void Arguments::process_java_compiler_argument(const char* arg) {
1958 // For backwards compatibility, Djava.compiler=NONE or ""
1959 // causes us to switch to -Xint mode UNLESS -Xdebug
1960 // is also specified.
1961 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1962 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1963 }
1964 }
1965
1966 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1967 _sun_java_launcher = os::strdup_check_oom(launcher);
1968 }
1969
1970 bool Arguments::created_by_java_launcher() {
1971 assert(_sun_java_launcher != NULL, "property must have value");
1972 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1973 }
1974
1975 bool Arguments::sun_java_launcher_is_altjvm() {
1976 return _sun_java_launcher_is_altjvm;
1977 }
1978
1979 //===========================================================================================================
1980 // Parsing of main arguments
1981
1982 #if INCLUDE_JVMCI
1983 // Check consistency of jvmci vm argument settings.
1984 bool Arguments::check_jvmci_args_consistency() {
1985 return JVMCIGlobals::check_jvmci_flags_are_consistent();
1986 }
1987 #endif //INCLUDE_JVMCI
1988
1989 // Check consistency of GC selection
1990 bool Arguments::check_gc_consistency() {
1991 // Ensure that the user has not selected conflicting sets
1992 // of collectors.
1993 uint i = 0;
1994 if (UseSerialGC) i++;
1995 if (UseConcMarkSweepGC) i++;
1996 if (UseParallelGC || UseParallelOldGC) i++;
1997 if (UseG1GC) i++;
1998 if (i > 1) {
1999 jio_fprintf(defaultStream::error_stream(),
2000 "Conflicting collector combinations in option list; "
2001 "please refer to the release notes for the combinations "
2002 "allowed\n");
2003 return false;
2004 }
2005
2006 if (UseConcMarkSweepGC && !UseParNewGC) {
2007 jio_fprintf(defaultStream::error_stream(),
2008 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2009 return false;
2010 }
2011
2012 if (UseParNewGC && !UseConcMarkSweepGC) {
2013 jio_fprintf(defaultStream::error_stream(),
2014 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2015 return false;
2016 }
2017
2018 return true;
2019 }
2020
2021 // Check the consistency of vm_init_args
2022 bool Arguments::check_vm_args_consistency() {
2023 // Method for adding checks for flag consistency.
2024 // The intent is to warn the user of all possible conflicts,
2025 // before returning an error.
2026 // Note: Needs platform-dependent factoring.
2027 bool status = true;
2028
2029 if (TLABRefillWasteFraction == 0) {
2030 jio_fprintf(defaultStream::error_stream(),
2031 "TLABRefillWasteFraction should be a denominator, "
2032 "not " SIZE_FORMAT "\n",
2033 TLABRefillWasteFraction);
2034 status = false;
2035 }
2036
2037 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2038 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2039 }
2040
2041 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2042 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2043 }
2044
2045 if (GCTimeLimit == 100) {
2046 // Turn off gc-overhead-limit-exceeded checks
2047 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2048 }
2049
2050 status = status && check_gc_consistency();
2051
2052 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2053 // insists that we hold the requisite locks so that the iteration is
2054 // MT-safe. For the verification at start-up and shut-down, we don't
2055 // yet have a good way of acquiring and releasing these locks,
2056 // which are not visible at the CollectedHeap level. We want to
2057 // be able to acquire these locks and then do the iteration rather
2058 // than just disable the lock verification. This will be fixed under
2059 // bug 4788986.
2060 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2061 if (VerifyDuringStartup) {
2062 warning("Heap verification at start-up disabled "
2063 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2064 VerifyDuringStartup = false; // Disable verification at start-up
2065 }
2066
2067 if (VerifyBeforeExit) {
2068 warning("Heap verification at shutdown disabled "
2069 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2070 VerifyBeforeExit = false; // Disable verification at shutdown
2071 }
2072 }
2073
2074 if (PrintNMTStatistics) {
2075 #if INCLUDE_NMT
2076 if (MemTracker::tracking_level() == NMT_off) {
2077 #endif // INCLUDE_NMT
2078 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2079 PrintNMTStatistics = false;
2080 #if INCLUDE_NMT
2081 }
2082 #endif
2083 }
2084 #if INCLUDE_JVMCI
2085
2086 status = status && check_jvmci_args_consistency();
2087
2088 if (EnableJVMCI) {
2089 if (!ScavengeRootsInCode) {
2090 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2091 ScavengeRootsInCode = 1;
2092 }
2093 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2094 TypeProfileLevel = 0;
2095 }
2096 if (UseJVMCICompiler) {
2097 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2098 TypeProfileWidth = 8;
2099 }
2100 }
2101 }
2102 #endif
2103
2104 // Check lower bounds of the code cache
2105 // Template Interpreter code is approximately 3X larger in debug builds.
2106 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2107 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2108 jio_fprintf(defaultStream::error_stream(),
2109 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2110 os::vm_page_size()/K);
2111 status = false;
2112 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2113 jio_fprintf(defaultStream::error_stream(),
2114 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2115 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2116 status = false;
2117 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2118 jio_fprintf(defaultStream::error_stream(),
2119 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2120 min_code_cache_size/K);
2121 status = false;
2122 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2123 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2124 jio_fprintf(defaultStream::error_stream(),
2125 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2126 CODE_CACHE_SIZE_LIMIT/M);
2127 status = false;
2128 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2129 jio_fprintf(defaultStream::error_stream(),
2130 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2131 min_code_cache_size/K);
2132 status = false;
2133 }
2134
2135 #ifdef _LP64
2136 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2137 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2138 }
2139 #endif
2140
2141 #ifndef SUPPORT_RESERVED_STACK_AREA
2142 if (StackReservedPages != 0) {
2143 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2144 warning("Reserved Stack Area not supported on this platform");
2145 }
2146 #endif
2147
2148 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2149 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2150 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2151 }
2152 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2153 }
2154 if (UseCompiler && is_interpreter_only()) {
2155 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2156 warning("UseCompiler disabled due to -Xint.");
2157 }
2158 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2159 }
2160 #ifdef COMPILER2
2161 if (PostLoopMultiversioning && !RangeCheckElimination) {
2162 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2163 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2164 }
2165 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2166 }
2167 #endif
2168 return status;
2169 }
2170
2171 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2172 const char* option_type) {
2173 if (ignore) return false;
2174
2175 const char* spacer = " ";
2176 if (option_type == NULL) {
2177 option_type = ++spacer; // Set both to the empty string.
2178 }
2179
2180 if (os::obsolete_option(option)) {
2181 jio_fprintf(defaultStream::error_stream(),
2182 "Obsolete %s%soption: %s\n", option_type, spacer,
2183 option->optionString);
2184 return false;
2185 } else {
2186 jio_fprintf(defaultStream::error_stream(),
2187 "Unrecognized %s%soption: %s\n", option_type, spacer,
2188 option->optionString);
2189 return true;
2190 }
2191 }
2192
2193 static const char* user_assertion_options[] = {
2194 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2195 };
2196
2197 static const char* system_assertion_options[] = {
2198 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2199 };
2200
2201 bool Arguments::parse_uintx(const char* value,
2202 uintx* uintx_arg,
2203 uintx min_size) {
2204
2205 // Check the sign first since atojulong() parses only unsigned values.
2206 bool value_is_positive = !(*value == '-');
2207
2208 if (value_is_positive) {
2209 julong n;
2210 bool good_return = atojulong(value, &n);
2211 if (good_return) {
2212 bool above_minimum = n >= min_size;
2213 bool value_is_too_large = n > max_uintx;
2214
2215 if (above_minimum && !value_is_too_large) {
2216 *uintx_arg = n;
2217 return true;
2218 }
2219 }
2220 }
2221 return false;
2222 }
2223
2224 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2225 julong* long_arg,
2226 julong min_size) {
2227 if (!atojulong(s, long_arg)) return arg_unreadable;
2228 return check_memory_size(*long_arg, min_size);
2229 }
2230
2231 // Parse JavaVMInitArgs structure
2232
2233 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2234 const JavaVMInitArgs *java_options_args,
2235 const JavaVMInitArgs *cmd_line_args) {
2236 bool xpatch_javabase = false;
2237
2238 // Save default settings for some mode flags
2239 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2240 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2241 Arguments::_ClipInlining = ClipInlining;
2242 Arguments::_BackgroundCompilation = BackgroundCompilation;
2243 if (TieredCompilation) {
2244 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2245 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2246 }
2247
2248 // Setup flags for mixed which is the default
2249 set_mode_flags(_mixed);
2250
2251 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2252 // variable (if present).
2253 jint result = parse_each_vm_init_arg(java_tool_options_args, &xpatch_javabase, Flag::ENVIRON_VAR);
2254 if (result != JNI_OK) {
2255 return result;
2256 }
2257
2258 // Parse args structure generated from the command line flags.
2259 result = parse_each_vm_init_arg(cmd_line_args, &xpatch_javabase, Flag::COMMAND_LINE);
2260 if (result != JNI_OK) {
2261 return result;
2262 }
2263
2264 // Parse args structure generated from the _JAVA_OPTIONS environment
2265 // variable (if present) (mimics classic VM)
2266 result = parse_each_vm_init_arg(java_options_args, &xpatch_javabase, Flag::ENVIRON_VAR);
2267 if (result != JNI_OK) {
2268 return result;
2269 }
2270
2271 // Do final processing now that all arguments have been parsed
2272 result = finalize_vm_init_args();
2273 if (result != JNI_OK) {
2274 return result;
2275 }
2276
2277 return JNI_OK;
2278 }
2279
2280 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2281 // represents a valid JDWP agent. is_path==true denotes that we
2282 // are dealing with -agentpath (case where name is a path), otherwise with
2283 // -agentlib
2284 bool valid_jdwp_agent(char *name, bool is_path) {
2285 char *_name;
2286 const char *_jdwp = "jdwp";
2287 size_t _len_jdwp, _len_prefix;
2288
2289 if (is_path) {
2290 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2291 return false;
2292 }
2293
2294 _name++; // skip past last path separator
2295 _len_prefix = strlen(JNI_LIB_PREFIX);
2296
2297 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2298 return false;
2299 }
2300
2301 _name += _len_prefix;
2302 _len_jdwp = strlen(_jdwp);
2303
2304 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2305 _name += _len_jdwp;
2306 }
2307 else {
2308 return false;
2309 }
2310
2311 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2312 return false;
2313 }
2314
2315 return true;
2316 }
2317
2318 if (strcmp(name, _jdwp) == 0) {
2319 return true;
2320 }
2321
2322 return false;
2323 }
2324
2325 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* xpatch_javabase, Flag::Flags origin) {
2326 // For match_option to return remaining or value part of option string
2327 const char* tail;
2328
2329 // iterate over arguments
2330 for (int index = 0; index < args->nOptions; index++) {
2331 bool is_absolute_path = false; // for -agentpath vs -agentlib
2332
2333 const JavaVMOption* option = args->options + index;
2334
2335 if (!match_option(option, "-Djava.class.path", &tail) &&
2336 !match_option(option, "-Dsun.java.command", &tail) &&
2337 !match_option(option, "-Dsun.java.launcher", &tail)) {
2338
2339 // add all jvm options to the jvm_args string. This string
2340 // is used later to set the java.vm.args PerfData string constant.
2341 // the -Djava.class.path and the -Dsun.java.command options are
2342 // omitted from jvm_args string as each have their own PerfData
2343 // string constant object.
2344 build_jvm_args(option->optionString);
2345 }
2346
2347 // -verbose:[class/gc/jni]
2348 if (match_option(option, "-verbose", &tail)) {
2349 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2350 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2351 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2352 } else if (!strcmp(tail, ":gc")) {
2353 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2354 } else if (!strcmp(tail, ":jni")) {
2355 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2356 return JNI_EINVAL;
2357 }
2358 }
2359 // -da / -ea / -disableassertions / -enableassertions
2360 // These accept an optional class/package name separated by a colon, e.g.,
2361 // -da:java.lang.Thread.
2362 } else if (match_option(option, user_assertion_options, &tail, true)) {
2363 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2364 if (*tail == '\0') {
2365 JavaAssertions::setUserClassDefault(enable);
2366 } else {
2367 assert(*tail == ':', "bogus match by match_option()");
2368 JavaAssertions::addOption(tail + 1, enable);
2369 }
2370 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2371 } else if (match_option(option, system_assertion_options, &tail, false)) {
2372 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2373 JavaAssertions::setSystemClassDefault(enable);
2374 // -bootclasspath:
2375 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2376 jio_fprintf(defaultStream::output_stream(),
2377 "-Xbootclasspath is no longer a supported option.\n");
2378 return JNI_EINVAL;
2379 // -bootclasspath/a:
2380 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2381 Arguments::append_sysclasspath(tail);
2382 // -bootclasspath/p:
2383 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2384 jio_fprintf(defaultStream::output_stream(),
2385 "-Xbootclasspath/p is no longer a supported option.\n");
2386 return JNI_EINVAL;
2387 // -Xrun
2388 } else if (match_option(option, "-Xrun", &tail)) {
2389 if (tail != NULL) {
2390 const char* pos = strchr(tail, ':');
2391 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2392 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2393 name[len] = '\0';
2394
2395 char *options = NULL;
2396 if(pos != NULL) {
2397 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2398 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2399 }
2400 #if !INCLUDE_JVMTI
2401 if (strcmp(name, "jdwp") == 0) {
2402 jio_fprintf(defaultStream::error_stream(),
2403 "Debugging agents are not supported in this VM\n");
2404 return JNI_ERR;
2405 }
2406 #endif // !INCLUDE_JVMTI
2407 add_init_library(name, options);
2408 }
2409 // -agentlib and -agentpath
2410 } else if (match_option(option, "-agentlib:", &tail) ||
2411 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2412 if(tail != NULL) {
2413 const char* pos = strchr(tail, '=');
2414 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2415 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2416 name[len] = '\0';
2417
2418 char *options = NULL;
2419 if(pos != NULL) {
2420 options = os::strdup_check_oom(pos + 1, mtArguments);
2421 }
2422 #if !INCLUDE_JVMTI
2423 if (valid_jdwp_agent(name, is_absolute_path)) {
2424 jio_fprintf(defaultStream::error_stream(),
2425 "Debugging agents are not supported in this VM\n");
2426 return JNI_ERR;
2427 }
2428 #endif // !INCLUDE_JVMTI
2429 add_init_agent(name, options, is_absolute_path);
2430 }
2431 // -javaagent
2432 } else if (match_option(option, "-javaagent:", &tail)) {
2433 #if !INCLUDE_JVMTI
2434 jio_fprintf(defaultStream::error_stream(),
2435 "Instrumentation agents are not supported in this VM\n");
2436 return JNI_ERR;
2437 #else
2438 if (tail != NULL) {
2439 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtArguments), tail);
2440 add_init_agent("instrument", options, false);
2441 // java agents need module java.instrument
2442 if (!Arguments::append_to_addmods_property("java.instrument")) {
2443 return JNI_ENOMEM;
2444 }
2445 }
2446 #endif // !INCLUDE_JVMTI
2447 // -Xnoclassgc
2448 } else if (match_option(option, "-Xnoclassgc")) {
2449 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2450 return JNI_EINVAL;
2451 }
2452 // -Xconcgc
2453 } else if (match_option(option, "-Xconcgc")) {
2454 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2455 return JNI_EINVAL;
2456 }
2457 // -Xnoconcgc
2458 } else if (match_option(option, "-Xnoconcgc")) {
2459 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2460 return JNI_EINVAL;
2461 }
2462 // -Xbatch
2463 } else if (match_option(option, "-Xbatch")) {
2464 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2465 return JNI_EINVAL;
2466 }
2467 // -Xmn for compatibility with other JVM vendors
2468 } else if (match_option(option, "-Xmn", &tail)) {
2469 julong long_initial_young_size = 0;
2470 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2471 if (errcode != arg_in_range) {
2472 jio_fprintf(defaultStream::error_stream(),
2473 "Invalid initial young generation size: %s\n", option->optionString);
2474 describe_range_error(errcode);
2475 return JNI_EINVAL;
2476 }
2477 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2478 return JNI_EINVAL;
2479 }
2480 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2481 return JNI_EINVAL;
2482 }
2483 // -Xms
2484 } else if (match_option(option, "-Xms", &tail)) {
2485 julong long_initial_heap_size = 0;
2486 // an initial heap size of 0 means automatically determine
2487 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2488 if (errcode != arg_in_range) {
2489 jio_fprintf(defaultStream::error_stream(),
2490 "Invalid initial heap size: %s\n", option->optionString);
2491 describe_range_error(errcode);
2492 return JNI_EINVAL;
2493 }
2494 set_min_heap_size((size_t)long_initial_heap_size);
2495 // Currently the minimum size and the initial heap sizes are the same.
2496 // Can be overridden with -XX:InitialHeapSize.
2497 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2498 return JNI_EINVAL;
2499 }
2500 // -Xmx
2501 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2502 julong long_max_heap_size = 0;
2503 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2504 if (errcode != arg_in_range) {
2505 jio_fprintf(defaultStream::error_stream(),
2506 "Invalid maximum heap size: %s\n", option->optionString);
2507 describe_range_error(errcode);
2508 return JNI_EINVAL;
2509 }
2510 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2511 return JNI_EINVAL;
2512 }
2513 // Xmaxf
2514 } else if (match_option(option, "-Xmaxf", &tail)) {
2515 char* err;
2516 int maxf = (int)(strtod(tail, &err) * 100);
2517 if (*err != '\0' || *tail == '\0') {
2518 jio_fprintf(defaultStream::error_stream(),
2519 "Bad max heap free percentage size: %s\n",
2520 option->optionString);
2521 return JNI_EINVAL;
2522 } else {
2523 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2524 return JNI_EINVAL;
2525 }
2526 }
2527 // Xminf
2528 } else if (match_option(option, "-Xminf", &tail)) {
2529 char* err;
2530 int minf = (int)(strtod(tail, &err) * 100);
2531 if (*err != '\0' || *tail == '\0') {
2532 jio_fprintf(defaultStream::error_stream(),
2533 "Bad min heap free percentage size: %s\n",
2534 option->optionString);
2535 return JNI_EINVAL;
2536 } else {
2537 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2538 return JNI_EINVAL;
2539 }
2540 }
2541 // -Xss
2542 } else if (match_option(option, "-Xss", &tail)) {
2543 julong long_ThreadStackSize = 0;
2544 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2545 if (errcode != arg_in_range) {
2546 jio_fprintf(defaultStream::error_stream(),
2547 "Invalid thread stack size: %s\n", option->optionString);
2548 describe_range_error(errcode);
2549 return JNI_EINVAL;
2550 }
2551 // Internally track ThreadStackSize in units of 1024 bytes.
2552 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2553 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2554 return JNI_EINVAL;
2555 }
2556 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
2557 } else if (match_option(option, "-Xoss", &tail) ||
2558 match_option(option, "-Xsqnopause") ||
2559 match_option(option, "-Xoptimize") ||
2560 match_option(option, "-Xboundthreads") ||
2561 match_option(option, "-Xusealtsigs")) {
2562 // All these options are deprecated in JDK 9 and will be removed in a future release
2563 char version[256];
2564 JDK_Version::jdk(9).to_string(version, sizeof(version));
2565 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2566 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2567 julong long_CodeCacheExpansionSize = 0;
2568 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2569 if (errcode != arg_in_range) {
2570 jio_fprintf(defaultStream::error_stream(),
2571 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2572 os::vm_page_size()/K);
2573 return JNI_EINVAL;
2574 }
2575 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
2576 return JNI_EINVAL;
2577 }
2578 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2579 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2580 julong long_ReservedCodeCacheSize = 0;
2581
2582 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2583 if (errcode != arg_in_range) {
2584 jio_fprintf(defaultStream::error_stream(),
2585 "Invalid maximum code cache size: %s.\n", option->optionString);
2586 return JNI_EINVAL;
2587 }
2588 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2589 return JNI_EINVAL;
2590 }
2591 // -XX:NonNMethodCodeHeapSize=
2592 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2593 julong long_NonNMethodCodeHeapSize = 0;
2594
2595 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2596 if (errcode != arg_in_range) {
2597 jio_fprintf(defaultStream::error_stream(),
2598 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2599 return JNI_EINVAL;
2600 }
2601 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
2602 return JNI_EINVAL;
2603 }
2604 // -XX:ProfiledCodeHeapSize=
2605 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2606 julong long_ProfiledCodeHeapSize = 0;
2607
2608 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2609 if (errcode != arg_in_range) {
2610 jio_fprintf(defaultStream::error_stream(),
2611 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2612 return JNI_EINVAL;
2613 }
2614 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
2615 return JNI_EINVAL;
2616 }
2617 // -XX:NonProfiledCodeHeapSizee=
2618 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2619 julong long_NonProfiledCodeHeapSize = 0;
2620
2621 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2622 if (errcode != arg_in_range) {
2623 jio_fprintf(defaultStream::error_stream(),
2624 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2625 return JNI_EINVAL;
2626 }
2627 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
2628 return JNI_EINVAL;
2629 }
2630 // -green
2631 } else if (match_option(option, "-green")) {
2632 jio_fprintf(defaultStream::error_stream(),
2633 "Green threads support not available\n");
2634 return JNI_EINVAL;
2635 // -native
2636 } else if (match_option(option, "-native")) {
2637 // HotSpot always uses native threads, ignore silently for compatibility
2638 // -Xrs
2639 } else if (match_option(option, "-Xrs")) {
2640 // Classic/EVM option, new functionality
2641 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2642 return JNI_EINVAL;
2643 }
2644 // -Xprof
2645 } else if (match_option(option, "-Xprof")) {
2646 #if INCLUDE_FPROF
2647 _has_profile = true;
2648 #else // INCLUDE_FPROF
2649 jio_fprintf(defaultStream::error_stream(),
2650 "Flat profiling is not supported in this VM.\n");
2651 return JNI_ERR;
2652 #endif // INCLUDE_FPROF
2653 // -Xconcurrentio
2654 } else if (match_option(option, "-Xconcurrentio")) {
2655 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2656 return JNI_EINVAL;
2657 }
2658 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2659 return JNI_EINVAL;
2660 }
2661 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
2662 return JNI_EINVAL;
2663 }
2664 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2665 return JNI_EINVAL;
2666 }
2667 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
2668 return JNI_EINVAL;
2669 }
2670
2671 // -Xinternalversion
2672 } else if (match_option(option, "-Xinternalversion")) {
2673 jio_fprintf(defaultStream::output_stream(), "%s\n",
2674 VM_Version::internal_vm_info_string());
2675 vm_exit(0);
2676 #ifndef PRODUCT
2677 // -Xprintflags
2678 } else if (match_option(option, "-Xprintflags")) {
2679 CommandLineFlags::printFlags(tty, false);
2680 vm_exit(0);
2681 #endif
2682 // -D
2683 } else if (match_option(option, "-D", &tail)) {
2684 const char* value;
2685 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2686 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2687 // abort if -Djava.endorsed.dirs is set
2688 jio_fprintf(defaultStream::output_stream(),
2689 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2690 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2691 return JNI_EINVAL;
2692 }
2693 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2694 *value != '\0' && strcmp(value, "\"\"") != 0) {
2695 // abort if -Djava.ext.dirs is set
2696 jio_fprintf(defaultStream::output_stream(),
2697 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2698 return JNI_EINVAL;
2699 }
2700
2701 if (!add_property(tail)) {
2702 return JNI_ENOMEM;
2703 }
2704 // Out of the box management support
2705 if (match_option(option, "-Dcom.sun.management", &tail)) {
2706 #if INCLUDE_MANAGEMENT
2707 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
2708 return JNI_EINVAL;
2709 }
2710 // management agent in module java.management
2711 if (!Arguments::append_to_addmods_property("java.management")) {
2712 return JNI_ENOMEM;
2713 }
2714 #else
2715 jio_fprintf(defaultStream::output_stream(),
2716 "-Dcom.sun.management is not supported in this VM.\n");
2717 return JNI_ERR;
2718 #endif
2719 }
2720 if (match_option(option, "-Djdk.launcher.patch.", &tail)) {
2721 // -Djdk.launcher.patch.#=<module>=<file>(<pathsep><file>)*
2722 // The number, #, specified will be increasing with each -Xpatch
2723 // specified on the command line.
2724 // Pick up module name, following the -D property's equal sign.
2725 const char* property_equal = strchr(tail, '=');
2726 if (property_equal == NULL) {
2727 jio_fprintf(defaultStream::output_stream(), "Missing '=' in -Xpatch specification\n");
2728 return JNI_ERR;
2729 } else {
2730 // Find the equal sign between the module name and the path specification
2731 const char* module_equal = strchr(property_equal + 1, '=');
2732 if (module_equal == NULL) {
2733 jio_fprintf(defaultStream::output_stream(), "Bad value for -Xpatch, no module name specified\n");
2734 return JNI_ERR;
2735 } else {
2736 // Pick out the module name, in between the two equal signs
2737 size_t module_len = module_equal - property_equal - 1;
2738 char* module_name = NEW_C_HEAP_ARRAY(char, module_len+1, mtArguments);
2739 memcpy(module_name, property_equal + 1, module_len);
2740 *(module_name + module_len) = '\0';
2741 // The path piece begins one past the module_equal sign
2742 Arguments::add_xpatchprefix(module_name, module_equal + 1, xpatch_javabase);
2743 FREE_C_HEAP_ARRAY(char, module_name);
2744 }
2745 }
2746 }
2747 // -Xint
2748 } else if (match_option(option, "-Xint")) {
2749 set_mode_flags(_int);
2750 // -Xmixed
2751 } else if (match_option(option, "-Xmixed")) {
2752 set_mode_flags(_mixed);
2753 // -Xcomp
2754 } else if (match_option(option, "-Xcomp")) {
2755 // for testing the compiler; turn off all flags that inhibit compilation
2756 set_mode_flags(_comp);
2757 // -Xshare:dump
2758 } else if (match_option(option, "-Xshare:dump")) {
2759 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
2760 return JNI_EINVAL;
2761 }
2762 set_mode_flags(_int); // Prevent compilation, which creates objects
2763 // -Xshare:on
2764 } else if (match_option(option, "-Xshare:on")) {
2765 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
2766 return JNI_EINVAL;
2767 }
2768 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
2769 return JNI_EINVAL;
2770 }
2771 // -Xshare:auto
2772 } else if (match_option(option, "-Xshare:auto")) {
2773 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
2774 return JNI_EINVAL;
2775 }
2776 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
2777 return JNI_EINVAL;
2778 }
2779 // -Xshare:off
2780 } else if (match_option(option, "-Xshare:off")) {
2781 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
2782 return JNI_EINVAL;
2783 }
2784 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
2785 return JNI_EINVAL;
2786 }
2787 // -Xverify
2788 } else if (match_option(option, "-Xverify", &tail)) {
2789 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2790 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
2791 return JNI_EINVAL;
2792 }
2793 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
2794 return JNI_EINVAL;
2795 }
2796 } else if (strcmp(tail, ":remote") == 0) {
2797 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
2798 return JNI_EINVAL;
2799 }
2800 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
2801 return JNI_EINVAL;
2802 }
2803 } else if (strcmp(tail, ":none") == 0) {
2804 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
2805 return JNI_EINVAL;
2806 }
2807 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
2808 return JNI_EINVAL;
2809 }
2810 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2811 return JNI_EINVAL;
2812 }
2813 // -Xdebug
2814 } else if (match_option(option, "-Xdebug")) {
2815 // note this flag has been used, then ignore
2816 set_xdebug_mode(true);
2817 // -Xnoagent
2818 } else if (match_option(option, "-Xnoagent")) {
2819 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2820 } else if (match_option(option, "-Xloggc:", &tail)) {
2821 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2822 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2823 _gc_log_filename = os::strdup_check_oom(tail);
2824 } else if (match_option(option, "-Xlog", &tail)) {
2825 bool ret = false;
2826 if (strcmp(tail, ":help") == 0) {
2827 LogConfiguration::print_command_line_help(defaultStream::output_stream());
2828 vm_exit(0);
2829 } else if (strcmp(tail, ":disable") == 0) {
2830 LogConfiguration::disable_logging();
2831 ret = true;
2832 } else if (*tail == '\0') {
2833 ret = LogConfiguration::parse_command_line_arguments();
2834 assert(ret, "-Xlog without arguments should never fail to parse");
2835 } else if (*tail == ':') {
2836 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2837 }
2838 if (ret == false) {
2839 jio_fprintf(defaultStream::error_stream(),
2840 "Invalid -Xlog option '-Xlog%s'\n",
2841 tail);
2842 return JNI_EINVAL;
2843 }
2844 // JNI hooks
2845 } else if (match_option(option, "-Xcheck", &tail)) {
2846 if (!strcmp(tail, ":jni")) {
2847 #if !INCLUDE_JNI_CHECK
2848 warning("JNI CHECKING is not supported in this VM");
2849 #else
2850 CheckJNICalls = true;
2851 #endif // INCLUDE_JNI_CHECK
2852 } else if (is_bad_option(option, args->ignoreUnrecognized,
2853 "check")) {
2854 return JNI_EINVAL;
2855 }
2856 } else if (match_option(option, "vfprintf")) {
2857 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2858 } else if (match_option(option, "exit")) {
2859 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2860 } else if (match_option(option, "abort")) {
2861 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2862 // -XX:+AggressiveHeap
2863 } else if (match_option(option, "-XX:+AggressiveHeap")) {
2864 jint result = set_aggressive_heap_flags();
2865 if (result != JNI_OK) {
2866 return result;
2867 }
2868 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2869 // and the last option wins.
2870 } else if (match_option(option, "-XX:+NeverTenure")) {
2871 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
2872 return JNI_EINVAL;
2873 }
2874 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
2875 return JNI_EINVAL;
2876 }
2877 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
2878 return JNI_EINVAL;
2879 }
2880 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2881 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
2882 return JNI_EINVAL;
2883 }
2884 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
2885 return JNI_EINVAL;
2886 }
2887 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
2888 return JNI_EINVAL;
2889 }
2890 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2891 uintx max_tenuring_thresh = 0;
2892 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2893 jio_fprintf(defaultStream::error_stream(),
2894 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2895 return JNI_EINVAL;
2896 }
2897
2898 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
2899 return JNI_EINVAL;
2900 }
2901
2902 if (MaxTenuringThreshold == 0) {
2903 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
2904 return JNI_EINVAL;
2905 }
2906 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
2907 return JNI_EINVAL;
2908 }
2909 } else {
2910 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
2911 return JNI_EINVAL;
2912 }
2913 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
2914 return JNI_EINVAL;
2915 }
2916 }
2917 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2918 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
2919 return JNI_EINVAL;
2920 }
2921 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
2922 return JNI_EINVAL;
2923 }
2924 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2925 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
2926 return JNI_EINVAL;
2927 }
2928 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
2929 return JNI_EINVAL;
2930 }
2931 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
2932 #if defined(DTRACE_ENABLED)
2933 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
2934 return JNI_EINVAL;
2935 }
2936 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
2937 return JNI_EINVAL;
2938 }
2939 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
2940 return JNI_EINVAL;
2941 }
2942 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
2943 return JNI_EINVAL;
2944 }
2945 #else // defined(DTRACE_ENABLED)
2946 jio_fprintf(defaultStream::error_stream(),
2947 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2948 return JNI_EINVAL;
2949 #endif // defined(DTRACE_ENABLED)
2950 #ifdef ASSERT
2951 } else if (match_option(option, "-XX:+FullGCALot")) {
2952 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
2953 return JNI_EINVAL;
2954 }
2955 // disable scavenge before parallel mark-compact
2956 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2957 return JNI_EINVAL;
2958 }
2959 #endif
2960 #if !INCLUDE_MANAGEMENT
2961 } else if (match_option(option, "-XX:+ManagementServer")) {
2962 jio_fprintf(defaultStream::error_stream(),
2963 "ManagementServer is not supported in this VM.\n");
2964 return JNI_ERR;
2965 #endif // INCLUDE_MANAGEMENT
2966 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2967 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2968 // already been handled
2969 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2970 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2971 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2972 return JNI_EINVAL;
2973 }
2974 }
2975 // Unknown option
2976 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2977 return JNI_ERR;
2978 }
2979 }
2980
2981 // PrintSharedArchiveAndExit will turn on
2982 // -Xshare:on
2983 // -Xlog:class+path=info
2984 if (PrintSharedArchiveAndExit) {
2985 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
2986 return JNI_EINVAL;
2987 }
2988 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
2989 return JNI_EINVAL;
2990 }
2991 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2992 }
2993
2994 // Change the default value for flags which have different default values
2995 // when working with older JDKs.
2996 #ifdef LINUX
2997 if (JDK_Version::current().compare_major(6) <= 0 &&
2998 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2999 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3000 }
3001 #endif // LINUX
3002 fix_appclasspath();
3003 return JNI_OK;
3004 }
3005
3006 void Arguments::add_xpatchprefix(const char* module_name, const char* path, bool* xpatch_javabase) {
3007 // For java.base check for duplicate -Xpatch options being specified on the command line.
3008 // This check is only required for java.base, all other duplicate module specifications
3009 // will be checked during module system initialization. The module system initialization
3010 // will throw an ExceptionInInitializerError if this situation occurs.
3011 if (strcmp(module_name, "java.base") == 0) {
3012 if (*xpatch_javabase) {
3013 vm_exit_during_initialization("Cannot specify java.base more than once to -Xpatch");
3014 } else {
3015 *xpatch_javabase = true;
3016 }
3017 }
3018
3019 // Create GrowableArray lazily, only if -Xpatch has been specified
3020 if (_xpatchprefix == NULL) {
3021 _xpatchprefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModuleXPatchPath*>(10, true);
3022 }
3023
3024 _xpatchprefix->push(new ModuleXPatchPath(module_name, path));
3025 }
3026
3027 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3028 //
3029 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3030 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3031 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3032 // path is treated as the current directory.
3033 //
3034 // This causes problems with CDS, which requires that all directories specified in the classpath
3035 // must be empty. In most cases, applications do NOT want to load classes from the current
3036 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3037 // scripts compatible with CDS.
3038 void Arguments::fix_appclasspath() {
3039 if (IgnoreEmptyClassPaths) {
3040 const char separator = *os::path_separator();
3041 const char* src = _java_class_path->value();
3042
3043 // skip over all the leading empty paths
3044 while (*src == separator) {
3045 src ++;
3046 }
3047
3048 char* copy = os::strdup_check_oom(src, mtArguments);
3049
3050 // trim all trailing empty paths
3051 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3052 *tail = '\0';
3053 }
3054
3055 char from[3] = {separator, separator, '\0'};
3056 char to [2] = {separator, '\0'};
3057 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3058 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3059 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3060 }
3061
3062 _java_class_path->set_writeable_value(copy);
3063 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3064 }
3065 }
3066
3067 static bool has_jar_files(const char* directory) {
3068 DIR* dir = os::opendir(directory);
3069 if (dir == NULL) return false;
3070
3071 struct dirent *entry;
3072 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3073 bool hasJarFile = false;
3074 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3075 const char* name = entry->d_name;
3076 const char* ext = name + strlen(name) - 4;
3077 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3078 }
3079 FREE_C_HEAP_ARRAY(char, dbuf);
3080 os::closedir(dir);
3081 return hasJarFile ;
3082 }
3083
3084 static int check_non_empty_dirs(const char* path) {
3085 const char separator = *os::path_separator();
3086 const char* const end = path + strlen(path);
3087 int nonEmptyDirs = 0;
3088 while (path < end) {
3089 const char* tmp_end = strchr(path, separator);
3090 if (tmp_end == NULL) {
3091 if (has_jar_files(path)) {
3092 nonEmptyDirs++;
3093 jio_fprintf(defaultStream::output_stream(),
3094 "Non-empty directory: %s\n", path);
3095 }
3096 path = end;
3097 } else {
3098 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3099 memcpy(dirpath, path, tmp_end - path);
3100 dirpath[tmp_end - path] = '\0';
3101 if (has_jar_files(dirpath)) {
3102 nonEmptyDirs++;
3103 jio_fprintf(defaultStream::output_stream(),
3104 "Non-empty directory: %s\n", dirpath);
3105 }
3106 FREE_C_HEAP_ARRAY(char, dirpath);
3107 path = tmp_end + 1;
3108 }
3109 }
3110 return nonEmptyDirs;
3111 }
3112
3113 jint Arguments::finalize_vm_init_args() {
3114 // check if the default lib/endorsed directory exists; if so, error
3115 char path[JVM_MAXPATHLEN];
3116 const char* fileSep = os::file_separator();
3117 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3118
3119 if (CheckEndorsedAndExtDirs) {
3120 int nonEmptyDirs = 0;
3121 // check endorsed directory
3122 nonEmptyDirs += check_non_empty_dirs(path);
3123 // check the extension directories
3124 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3125 if (nonEmptyDirs > 0) {
3126 return JNI_ERR;
3127 }
3128 }
3129
3130 DIR* dir = os::opendir(path);
3131 if (dir != NULL) {
3132 jio_fprintf(defaultStream::output_stream(),
3133 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3134 "in modular form will be supported via the concept of upgradeable modules.\n");
3135 os::closedir(dir);
3136 return JNI_ERR;
3137 }
3138
3139 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3140 dir = os::opendir(path);
3141 if (dir != NULL) {
3142 jio_fprintf(defaultStream::output_stream(),
3143 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3144 "Use -classpath instead.\n.");
3145 os::closedir(dir);
3146 return JNI_ERR;
3147 }
3148
3149 // This must be done after all arguments have been processed.
3150 // java_compiler() true means set to "NONE" or empty.
3151 if (java_compiler() && !xdebug_mode()) {
3152 // For backwards compatibility, we switch to interpreted mode if
3153 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3154 // not specified.
3155 set_mode_flags(_int);
3156 }
3157
3158 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3159 // but like -Xint, leave compilation thresholds unaffected.
3160 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3161 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3162 set_mode_flags(_int);
3163 }
3164
3165 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3166 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3167 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3168 }
3169
3170 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3171 // Don't degrade server performance for footprint
3172 if (FLAG_IS_DEFAULT(UseLargePages) &&
3173 MaxHeapSize < LargePageHeapSizeThreshold) {
3174 // No need for large granularity pages w/small heaps.
3175 // Note that large pages are enabled/disabled for both the
3176 // Java heap and the code cache.
3177 FLAG_SET_DEFAULT(UseLargePages, false);
3178 }
3179
3180 #elif defined(COMPILER2)
3181 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3182 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3183 }
3184 #endif
3185
3186 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3187 UNSUPPORTED_OPTION(ProfileInterpreter);
3188 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3189 #endif
3190
3191 #ifndef TIERED
3192 // Tiered compilation is undefined.
3193 UNSUPPORTED_OPTION(TieredCompilation);
3194 #endif
3195
3196 #if INCLUDE_JVMCI
3197 if (EnableJVMCI && !append_to_addmods_property("jdk.vm.ci")) {
3198 return JNI_ENOMEM;
3199 }
3200 #endif
3201
3202 // If we are running in a headless jre, force java.awt.headless property
3203 // to be true unless the property has already been set.
3204 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3205 if (os::is_headless_jre()) {
3206 const char* headless = Arguments::get_property("java.awt.headless");
3207 if (headless == NULL) {
3208 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3209 if (headless_env == NULL) {
3210 if (!add_property("java.awt.headless=true")) {
3211 return JNI_ENOMEM;
3212 }
3213 } else {
3214 char buffer[256];
3215 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3216 if (!add_property(buffer)) {
3217 return JNI_ENOMEM;
3218 }
3219 }
3220 }
3221 }
3222
3223 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3224 // CMS can only be used with ParNew
3225 FLAG_SET_ERGO(bool, UseParNewGC, true);
3226 }
3227
3228 if (!check_vm_args_consistency()) {
3229 return JNI_ERR;
3230 }
3231
3232 return JNI_OK;
3233 }
3234
3235 // Helper class for controlling the lifetime of JavaVMInitArgs
3236 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3237 // deleted on the destruction of the ScopedVMInitArgs object.
3238 class ScopedVMInitArgs : public StackObj {
3239 private:
3240 JavaVMInitArgs _args;
3241 char* _container_name;
3242 bool _is_set;
3243 char* _vm_options_file_arg;
3244
3245 public:
3246 ScopedVMInitArgs(const char *container_name) {
3247 _args.version = JNI_VERSION_1_2;
3248 _args.nOptions = 0;
3249 _args.options = NULL;
3250 _args.ignoreUnrecognized = false;
3251 _container_name = (char *)container_name;
3252 _is_set = false;
3253 _vm_options_file_arg = NULL;
3254 }
3255
3256 // Populates the JavaVMInitArgs object represented by this
3257 // ScopedVMInitArgs object with the arguments in options. The
3258 // allocated memory is deleted by the destructor. If this method
3259 // returns anything other than JNI_OK, then this object is in a
3260 // partially constructed state, and should be abandoned.
3261 jint set_args(GrowableArray<JavaVMOption>* options) {
3262 _is_set = true;
3263 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3264 JavaVMOption, options->length(), mtArguments);
3265 if (options_arr == NULL) {
3266 return JNI_ENOMEM;
3267 }
3268 _args.options = options_arr;
3269
3270 for (int i = 0; i < options->length(); i++) {
3271 options_arr[i] = options->at(i);
3272 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3273 if (options_arr[i].optionString == NULL) {
3274 // Rely on the destructor to do cleanup.
3275 _args.nOptions = i;
3276 return JNI_ENOMEM;
3277 }
3278 }
3279
3280 _args.nOptions = options->length();
3281 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3282 return JNI_OK;
3283 }
3284
3285 JavaVMInitArgs* get() { return &_args; }
3286 char* container_name() { return _container_name; }
3287 bool is_set() { return _is_set; }
3288 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3289 char* vm_options_file_arg() { return _vm_options_file_arg; }
3290
3291 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3292 if (_vm_options_file_arg != NULL) {
3293 os::free(_vm_options_file_arg);
3294 }
3295 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3296 }
3297
3298 ~ScopedVMInitArgs() {
3299 if (_vm_options_file_arg != NULL) {
3300 os::free(_vm_options_file_arg);
3301 }
3302 if (_args.options == NULL) return;
3303 for (int i = 0; i < _args.nOptions; i++) {
3304 os::free(_args.options[i].optionString);
3305 }
3306 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3307 }
3308
3309 // Insert options into this option list, to replace option at
3310 // vm_options_file_pos (-XX:VMOptionsFile)
3311 jint insert(const JavaVMInitArgs* args,
3312 const JavaVMInitArgs* args_to_insert,
3313 const int vm_options_file_pos) {
3314 assert(_args.options == NULL, "shouldn't be set yet");
3315 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3316 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3317
3318 int length = args->nOptions + args_to_insert->nOptions - 1;
3319 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3320 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3321 for (int i = 0; i < args->nOptions; i++) {
3322 if (i == vm_options_file_pos) {
3323 // insert the new options starting at the same place as the
3324 // -XX:VMOptionsFile option
3325 for (int j = 0; j < args_to_insert->nOptions; j++) {
3326 options->push(args_to_insert->options[j]);
3327 }
3328 } else {
3329 options->push(args->options[i]);
3330 }
3331 }
3332 // make into options array
3333 jint result = set_args(options);
3334 delete options;
3335 return result;
3336 }
3337 };
3338
3339 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3340 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3341 }
3342
3343 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3344 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3345 }
3346
3347 jint Arguments::parse_options_environment_variable(const char* name,
3348 ScopedVMInitArgs* vm_args) {
3349 char *buffer = ::getenv(name);
3350
3351 // Don't check this environment variable if user has special privileges
3352 // (e.g. unix su command).
3353 if (buffer == NULL || os::have_special_privileges()) {
3354 return JNI_OK;
3355 }
3356
3357 if ((buffer = os::strdup(buffer)) == NULL) {
3358 return JNI_ENOMEM;
3359 }
3360
3361 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3362
3363 os::free(buffer);
3364 return retcode;
3365 }
3366
3367 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3368 // read file into buffer
3369 int fd = ::open(file_name, O_RDONLY);
3370 if (fd < 0) {
3371 jio_fprintf(defaultStream::error_stream(),
3372 "Could not open options file '%s'\n",
3373 file_name);
3374 return JNI_ERR;
3375 }
3376
3377 struct stat stbuf;
3378 int retcode = os::stat(file_name, &stbuf);
3379 if (retcode != 0) {
3380 jio_fprintf(defaultStream::error_stream(),
3381 "Could not stat options file '%s'\n",
3382 file_name);
3383 os::close(fd);
3384 return JNI_ERR;
3385 }
3386
3387 if (stbuf.st_size == 0) {
3388 // tell caller there is no option data and that is ok
3389 os::close(fd);
3390 return JNI_OK;
3391 }
3392
3393 // '+ 1' for NULL termination even with max bytes
3394 size_t bytes_alloc = stbuf.st_size + 1;
3395
3396 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3397 if (NULL == buf) {
3398 jio_fprintf(defaultStream::error_stream(),
3399 "Could not allocate read buffer for options file parse\n");
3400 os::close(fd);
3401 return JNI_ENOMEM;
3402 }
3403
3404 memset(buf, 0, bytes_alloc);
3405
3406 // Fill buffer
3407 // Use ::read() instead of os::read because os::read()
3408 // might do a thread state transition
3409 // and it is too early for that here
3410
3411 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3412 os::close(fd);
3413 if (bytes_read < 0) {
3414 FREE_C_HEAP_ARRAY(char, buf);
3415 jio_fprintf(defaultStream::error_stream(),
3416 "Could not read options file '%s'\n", file_name);
3417 return JNI_ERR;
3418 }
3419
3420 if (bytes_read == 0) {
3421 // tell caller there is no option data and that is ok
3422 FREE_C_HEAP_ARRAY(char, buf);
3423 return JNI_OK;
3424 }
3425
3426 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3427
3428 FREE_C_HEAP_ARRAY(char, buf);
3429 return retcode;
3430 }
3431
3432 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3433 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3434
3435 // some pointers to help with parsing
3436 char *buffer_end = buffer + buf_len;
3437 char *opt_hd = buffer;
3438 char *wrt = buffer;
3439 char *rd = buffer;
3440
3441 // parse all options
3442 while (rd < buffer_end) {
3443 // skip leading white space from the input string
3444 while (rd < buffer_end && isspace(*rd)) {
3445 rd++;
3446 }
3447
3448 if (rd >= buffer_end) {
3449 break;
3450 }
3451
3452 // Remember this is where we found the head of the token.
3453 opt_hd = wrt;
3454
3455 // Tokens are strings of non white space characters separated
3456 // by one or more white spaces.
3457 while (rd < buffer_end && !isspace(*rd)) {
3458 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3459 int quote = *rd; // matching quote to look for
3460 rd++; // don't copy open quote
3461 while (rd < buffer_end && *rd != quote) {
3462 // include everything (even spaces)
3463 // up until the close quote
3464 *wrt++ = *rd++; // copy to option string
3465 }
3466
3467 if (rd < buffer_end) {
3468 rd++; // don't copy close quote
3469 } else {
3470 // did not see closing quote
3471 jio_fprintf(defaultStream::error_stream(),
3472 "Unmatched quote in %s\n", name);
3473 delete options;
3474 return JNI_ERR;
3475 }
3476 } else {
3477 *wrt++ = *rd++; // copy to option string
3478 }
3479 }
3480
3481 // steal a white space character and set it to NULL
3482 *wrt++ = '\0';
3483 // We now have a complete token
3484
3485 JavaVMOption option;
3486 option.optionString = opt_hd;
3487 option.extraInfo = NULL;
3488
3489 options->append(option); // Fill in option
3490
3491 rd++; // Advance to next character
3492 }
3493
3494 // Fill out JavaVMInitArgs structure.
3495 jint status = vm_args->set_args(options);
3496
3497 delete options;
3498 return status;
3499 }
3500
3501 void Arguments::set_shared_spaces_flags() {
3502 if (DumpSharedSpaces) {
3503 if (Arguments::get_xpatchprefix() != NULL) {
3504 vm_exit_during_initialization(
3505 "Cannot use the following option when dumping the shared archive", "-Xpatch");
3506 }
3507
3508 if (RequireSharedSpaces) {
3509 warning("Cannot dump shared archive while using shared archive");
3510 }
3511 UseSharedSpaces = false;
3512 #ifdef _LP64
3513 if (!UseCompressedOops || !UseCompressedClassPointers) {
3514 vm_exit_during_initialization(
3515 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3516 }
3517 } else {
3518 if (!UseCompressedOops || !UseCompressedClassPointers) {
3519 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3520 }
3521 #endif
3522 }
3523 }
3524
3525 // Sharing support
3526 // Construct the path to the archive
3527 static char* get_shared_archive_path() {
3528 char *shared_archive_path;
3529 if (SharedArchiveFile == NULL) {
3530 char jvm_path[JVM_MAXPATHLEN];
3531 os::jvm_path(jvm_path, sizeof(jvm_path));
3532 char *end = strrchr(jvm_path, *os::file_separator());
3533 if (end != NULL) *end = '\0';
3534 size_t jvm_path_len = strlen(jvm_path);
3535 size_t file_sep_len = strlen(os::file_separator());
3536 const size_t len = jvm_path_len + file_sep_len + 20;
3537 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3538 if (shared_archive_path != NULL) {
3539 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3540 jvm_path, os::file_separator());
3541 }
3542 } else {
3543 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3544 }
3545 return shared_archive_path;
3546 }
3547
3548 #ifndef PRODUCT
3549 // Determine whether LogVMOutput should be implicitly turned on.
3550 static bool use_vm_log() {
3551 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3552 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3553 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3554 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3555 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3556 return true;
3557 }
3558
3559 #ifdef COMPILER1
3560 if (PrintC1Statistics) {
3561 return true;
3562 }
3563 #endif // COMPILER1
3564
3565 #ifdef COMPILER2
3566 if (PrintOptoAssembly || PrintOptoStatistics) {
3567 return true;
3568 }
3569 #endif // COMPILER2
3570
3571 return false;
3572 }
3573
3574 #endif // PRODUCT
3575
3576 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3577 for (int index = 0; index < args->nOptions; index++) {
3578 const JavaVMOption* option = args->options + index;
3579 const char* tail;
3580 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3581 return true;
3582 }
3583 }
3584 return false;
3585 }
3586
3587 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3588 const char* vm_options_file,
3589 const int vm_options_file_pos,
3590 ScopedVMInitArgs* vm_options_file_args,
3591 ScopedVMInitArgs* args_out) {
3592 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3593 if (code != JNI_OK) {
3594 return code;
3595 }
3596
3597 if (vm_options_file_args->get()->nOptions < 1) {
3598 return JNI_OK;
3599 }
3600
3601 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3602 jio_fprintf(defaultStream::error_stream(),
3603 "A VM options file may not refer to a VM options file. "
3604 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3605 "options file '%s' in options container '%s' is an error.\n",
3606 vm_options_file_args->vm_options_file_arg(),
3607 vm_options_file_args->container_name());
3608 return JNI_EINVAL;
3609 }
3610
3611 return args_out->insert(args, vm_options_file_args->get(),
3612 vm_options_file_pos);
3613 }
3614
3615 // Expand -XX:VMOptionsFile found in args_in as needed.
3616 // mod_args and args_out parameters may return values as needed.
3617 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3618 ScopedVMInitArgs* mod_args,
3619 JavaVMInitArgs** args_out) {
3620 jint code = match_special_option_and_act(args_in, mod_args);
3621 if (code != JNI_OK) {
3622 return code;
3623 }
3624
3625 if (mod_args->is_set()) {
3626 // args_in contains -XX:VMOptionsFile and mod_args contains the
3627 // original options from args_in along with the options expanded
3628 // from the VMOptionsFile. Return a short-hand to the caller.
3629 *args_out = mod_args->get();
3630 } else {
3631 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3632 }
3633 return JNI_OK;
3634 }
3635
3636 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3637 ScopedVMInitArgs* args_out) {
3638 // Remaining part of option string
3639 const char* tail;
3640 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3641
3642 for (int index = 0; index < args->nOptions; index++) {
3643 const JavaVMOption* option = args->options + index;
3644 if (ArgumentsExt::process_options(option)) {
3645 continue;
3646 }
3647 if (match_option(option, "-XX:Flags=", &tail)) {
3648 Arguments::set_jvm_flags_file(tail);
3649 continue;
3650 }
3651 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3652 if (vm_options_file_args.found_vm_options_file_arg()) {
3653 jio_fprintf(defaultStream::error_stream(),
3654 "The option '%s' is already specified in the options "
3655 "container '%s' so the specification of '%s' in the "
3656 "same options container is an error.\n",
3657 vm_options_file_args.vm_options_file_arg(),
3658 vm_options_file_args.container_name(),
3659 option->optionString);
3660 return JNI_EINVAL;
3661 }
3662 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3663 // If there's a VMOptionsFile, parse that
3664 jint code = insert_vm_options_file(args, tail, index,
3665 &vm_options_file_args, args_out);
3666 if (code != JNI_OK) {
3667 return code;
3668 }
3669 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3670 if (args_out->is_set()) {
3671 // The VMOptions file inserted some options so switch 'args'
3672 // to the new set of options, and continue processing which
3673 // preserves "last option wins" semantics.
3674 args = args_out->get();
3675 // The first option from the VMOptionsFile replaces the
3676 // current option. So we back track to process the
3677 // replacement option.
3678 index--;
3679 }
3680 continue;
3681 }
3682 if (match_option(option, "-XX:+PrintVMOptions")) {
3683 PrintVMOptions = true;
3684 continue;
3685 }
3686 if (match_option(option, "-XX:-PrintVMOptions")) {
3687 PrintVMOptions = false;
3688 continue;
3689 }
3690 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3691 IgnoreUnrecognizedVMOptions = true;
3692 continue;
3693 }
3694 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3695 IgnoreUnrecognizedVMOptions = false;
3696 continue;
3697 }
3698 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3699 CommandLineFlags::printFlags(tty, false);
3700 vm_exit(0);
3701 }
3702 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3703 #if INCLUDE_NMT
3704 // The launcher did not setup nmt environment variable properly.
3705 if (!MemTracker::check_launcher_nmt_support(tail)) {
3706 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3707 }
3708
3709 // Verify if nmt option is valid.
3710 if (MemTracker::verify_nmt_option()) {
3711 // Late initialization, still in single-threaded mode.
3712 if (MemTracker::tracking_level() >= NMT_summary) {
3713 MemTracker::init();
3714 }
3715 } else {
3716 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3717 }
3718 continue;
3719 #else
3720 jio_fprintf(defaultStream::error_stream(),
3721 "Native Memory Tracking is not supported in this VM\n");
3722 return JNI_ERR;
3723 #endif
3724 }
3725
3726 #ifndef PRODUCT
3727 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3728 CommandLineFlags::printFlags(tty, true);
3729 vm_exit(0);
3730 }
3731 #endif
3732 }
3733 return JNI_OK;
3734 }
3735
3736 static void print_options(const JavaVMInitArgs *args) {
3737 const char* tail;
3738 for (int index = 0; index < args->nOptions; index++) {
3739 const JavaVMOption *option = args->options + index;
3740 if (match_option(option, "-XX:", &tail)) {
3741 logOption(tail);
3742 }
3743 }
3744 }
3745
3746 bool Arguments::handle_deprecated_print_gc_flags() {
3747 if (PrintGC) {
3748 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3749 }
3750 if (PrintGCDetails) {
3751 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3752 }
3753
3754 if (_gc_log_filename != NULL) {
3755 // -Xloggc was used to specify a filename
3756 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3757 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, NULL);
3758 } else if (PrintGC || PrintGCDetails) {
3759 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3760 }
3761 return true;
3762 }
3763
3764 // Parse entry point called from JNI_CreateJavaVM
3765
3766 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3767 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
3768
3769 // Initialize ranges, constraints and writeables
3770 CommandLineFlagRangeList::init();
3771 CommandLineFlagConstraintList::init();
3772 CommandLineFlagWriteableList::init();
3773
3774 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3775 const char* hotspotrc = ".hotspotrc";
3776 bool settings_file_specified = false;
3777 bool needs_hotspotrc_warning = false;
3778 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3779 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3780
3781 // Pointers to current working set of containers
3782 JavaVMInitArgs* cur_cmd_args;
3783 JavaVMInitArgs* cur_java_options_args;
3784 JavaVMInitArgs* cur_java_tool_options_args;
3785
3786 // Containers for modified/expanded options
3787 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3788 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3789 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3790
3791
3792 jint code =
3793 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3794 if (code != JNI_OK) {
3795 return code;
3796 }
3797
3798 code = parse_java_options_environment_variable(&initial_java_options_args);
3799 if (code != JNI_OK) {
3800 return code;
3801 }
3802
3803 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3804 &mod_java_tool_options_args,
3805 &cur_java_tool_options_args);
3806 if (code != JNI_OK) {
3807 return code;
3808 }
3809
3810 code = expand_vm_options_as_needed(initial_cmd_args,
3811 &mod_cmd_args,
3812 &cur_cmd_args);
3813 if (code != JNI_OK) {
3814 return code;
3815 }
3816
3817 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3818 &mod_java_options_args,
3819 &cur_java_options_args);
3820 if (code != JNI_OK) {
3821 return code;
3822 }
3823
3824 const char* flags_file = Arguments::get_jvm_flags_file();
3825 settings_file_specified = (flags_file != NULL);
3826
3827 if (IgnoreUnrecognizedVMOptions) {
3828 cur_cmd_args->ignoreUnrecognized = true;
3829 cur_java_tool_options_args->ignoreUnrecognized = true;
3830 cur_java_options_args->ignoreUnrecognized = true;
3831 }
3832
3833 // Parse specified settings file
3834 if (settings_file_specified) {
3835 if (!process_settings_file(flags_file, true,
3836 cur_cmd_args->ignoreUnrecognized)) {
3837 return JNI_EINVAL;
3838 }
3839 } else {
3840 #ifdef ASSERT
3841 // Parse default .hotspotrc settings file
3842 if (!process_settings_file(".hotspotrc", false,
3843 cur_cmd_args->ignoreUnrecognized)) {
3844 return JNI_EINVAL;
3845 }
3846 #else
3847 struct stat buf;
3848 if (os::stat(hotspotrc, &buf) == 0) {
3849 needs_hotspotrc_warning = true;
3850 }
3851 #endif
3852 }
3853
3854 if (PrintVMOptions) {
3855 print_options(cur_java_tool_options_args);
3856 print_options(cur_cmd_args);
3857 print_options(cur_java_options_args);
3858 }
3859
3860 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3861 jint result = parse_vm_init_args(cur_java_tool_options_args,
3862 cur_java_options_args,
3863 cur_cmd_args);
3864
3865 if (result != JNI_OK) {
3866 return result;
3867 }
3868
3869 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3870 SharedArchivePath = get_shared_archive_path();
3871 if (SharedArchivePath == NULL) {
3872 return JNI_ENOMEM;
3873 }
3874
3875 // Set up VerifySharedSpaces
3876 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3877 VerifySharedSpaces = true;
3878 }
3879
3880 // Delay warning until here so that we've had a chance to process
3881 // the -XX:-PrintWarnings flag
3882 if (needs_hotspotrc_warning) {
3883 warning("%s file is present but has been ignored. "
3884 "Run with -XX:Flags=%s to load the file.",
3885 hotspotrc, hotspotrc);
3886 }
3887
3888 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3889 UNSUPPORTED_OPTION(UseLargePages);
3890 #endif
3891
3892 ArgumentsExt::report_unsupported_options();
3893
3894 #ifndef PRODUCT
3895 if (TraceBytecodesAt != 0) {
3896 TraceBytecodes = true;
3897 }
3898 if (CountCompiledCalls) {
3899 if (UseCounterDecay) {
3900 warning("UseCounterDecay disabled because CountCalls is set");
3901 UseCounterDecay = false;
3902 }
3903 }
3904 #endif // PRODUCT
3905
3906 if (ScavengeRootsInCode == 0) {
3907 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3908 warning("Forcing ScavengeRootsInCode non-zero");
3909 }
3910 ScavengeRootsInCode = 1;
3911 }
3912
3913 if (!handle_deprecated_print_gc_flags()) {
3914 return JNI_EINVAL;
3915 }
3916
3917 // Set object alignment values.
3918 set_object_alignment();
3919
3920 #if !INCLUDE_CDS
3921 if (DumpSharedSpaces || RequireSharedSpaces) {
3922 jio_fprintf(defaultStream::error_stream(),
3923 "Shared spaces are not supported in this VM\n");
3924 return JNI_ERR;
3925 }
3926 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3927 warning("Shared spaces are not supported in this VM");
3928 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3929 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3930 }
3931 no_shared_spaces("CDS Disabled");
3932 #endif // INCLUDE_CDS
3933
3934 return JNI_OK;
3935 }
3936
3937 jint Arguments::apply_ergo() {
3938
3939 // Set flags based on ergonomics.
3940 set_ergonomics_flags();
3941
3942 set_shared_spaces_flags();
3943
3944 // Check the GC selections again.
3945 if (!check_gc_consistency()) {
3946 return JNI_EINVAL;
3947 }
3948
3949 if (TieredCompilation) {
3950 set_tiered_flags();
3951 } else {
3952 int max_compilation_policy_choice = 1;
3953 #ifdef COMPILER2
3954 max_compilation_policy_choice = 2;
3955 #endif
3956 // Check if the policy is valid.
3957 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
3958 vm_exit_during_initialization(
3959 "Incompatible compilation policy selected", NULL);
3960 }
3961 // Scale CompileThreshold
3962 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
3963 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
3964 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
3965 }
3966 }
3967
3968 #ifdef COMPILER2
3969 #ifndef PRODUCT
3970 if (PrintIdealGraphLevel > 0) {
3971 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
3972 }
3973 #endif
3974 #endif
3975
3976 // Set heap size based on available physical memory
3977 set_heap_size();
3978
3979 ArgumentsExt::set_gc_specific_flags();
3980
3981 // Initialize Metaspace flags and alignments
3982 Metaspace::ergo_initialize();
3983
3984 // Set bytecode rewriting flags
3985 set_bytecode_flags();
3986
3987 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3988 jint code = set_aggressive_opts_flags();
3989 if (code != JNI_OK) {
3990 return code;
3991 }
3992
3993 // Turn off biased locking for locking debug mode flags,
3994 // which are subtly different from each other but neither works with
3995 // biased locking
3996 if (UseHeavyMonitors
3997 #ifdef COMPILER1
3998 || !UseFastLocking
3999 #endif // COMPILER1
4000 #if INCLUDE_JVMCI
4001 || !JVMCIUseFastLocking
4002 #endif
4003 ) {
4004 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4005 // flag set to true on command line; warn the user that they
4006 // can't enable biased locking here
4007 warning("Biased Locking is not supported with locking debug flags"
4008 "; ignoring UseBiasedLocking flag." );
4009 }
4010 UseBiasedLocking = false;
4011 }
4012
4013 #ifdef CC_INTERP
4014 // Clear flags not supported on zero.
4015 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4016 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4017 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4018 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4019 #endif // CC_INTERP
4020
4021 #ifdef COMPILER2
4022 if (!EliminateLocks) {
4023 EliminateNestedLocks = false;
4024 }
4025 if (!Inline) {
4026 IncrementalInline = false;
4027 }
4028 #ifndef PRODUCT
4029 if (!IncrementalInline) {
4030 AlwaysIncrementalInline = false;
4031 }
4032 #endif
4033 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4034 // nothing to use the profiling, turn if off
4035 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4036 }
4037 #endif
4038
4039 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4040 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4041 DebugNonSafepoints = true;
4042 }
4043
4044 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4045 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4046 }
4047
4048 if (UseOnStackReplacement && !UseLoopCounter) {
4049 warning("On-stack-replacement requires loop counters; enabling loop counters");
4050 FLAG_SET_DEFAULT(UseLoopCounter, true);
4051 }
4052
4053 #ifndef PRODUCT
4054 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4055 if (use_vm_log()) {
4056 LogVMOutput = true;
4057 }
4058 }
4059 #endif // PRODUCT
4060
4061 if (PrintCommandLineFlags) {
4062 CommandLineFlags::printSetFlags(tty);
4063 }
4064
4065 // Apply CPU specific policy for the BiasedLocking
4066 if (UseBiasedLocking) {
4067 if (!VM_Version::use_biased_locking() &&
4068 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4069 UseBiasedLocking = false;
4070 }
4071 }
4072 #ifdef COMPILER2
4073 if (!UseBiasedLocking || EmitSync != 0) {
4074 UseOptoBiasInlining = false;
4075 }
4076 #endif
4077
4078 return JNI_OK;
4079 }
4080
4081 jint Arguments::adjust_after_os() {
4082 if (UseNUMA) {
4083 if (UseParallelGC || UseParallelOldGC) {
4084 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4085 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4086 }
4087 }
4088 // UseNUMAInterleaving is set to ON for all collectors and
4089 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4090 // such as the parallel collector for Linux and Solaris will
4091 // interleave old gen and survivor spaces on top of NUMA
4092 // allocation policy for the eden space.
4093 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4094 // all platforms and ParallelGC on Windows will interleave all
4095 // of the heap spaces across NUMA nodes.
4096 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4097 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4098 }
4099 }
4100 return JNI_OK;
4101 }
4102
4103 int Arguments::PropertyList_count(SystemProperty* pl) {
4104 int count = 0;
4105 while(pl != NULL) {
4106 count++;
4107 pl = pl->next();
4108 }
4109 return count;
4110 }
4111
4112 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4113 assert(key != NULL, "just checking");
4114 SystemProperty* prop;
4115 for (prop = pl; prop != NULL; prop = prop->next()) {
4116 if (strcmp(key, prop->key()) == 0) return prop->value();
4117 }
4118 return NULL;
4119 }
4120
4121 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4122 int count = 0;
4123 const char* ret_val = NULL;
4124
4125 while(pl != NULL) {
4126 if(count >= index) {
4127 ret_val = pl->key();
4128 break;
4129 }
4130 count++;
4131 pl = pl->next();
4132 }
4133
4134 return ret_val;
4135 }
4136
4137 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4138 int count = 0;
4139 char* ret_val = NULL;
4140
4141 while(pl != NULL) {
4142 if(count >= index) {
4143 ret_val = pl->value();
4144 break;
4145 }
4146 count++;
4147 pl = pl->next();
4148 }
4149
4150 return ret_val;
4151 }
4152
4153 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4154 SystemProperty* p = *plist;
4155 if (p == NULL) {
4156 *plist = new_p;
4157 } else {
4158 while (p->next() != NULL) {
4159 p = p->next();
4160 }
4161 p->set_next(new_p);
4162 }
4163 }
4164
4165 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v) {
4166 if (plist == NULL)
4167 return;
4168
4169 SystemProperty* new_p = new SystemProperty(k, v, true);
4170 PropertyList_add(plist, new_p);
4171 }
4172
4173 void Arguments::PropertyList_add(SystemProperty *element) {
4174 PropertyList_add(&_system_properties, element);
4175 }
4176
4177 // This add maintains unique property key in the list.
4178 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, jboolean append) {
4179 if (plist == NULL)
4180 return;
4181
4182 // If property key exist then update with new value.
4183 SystemProperty* prop;
4184 for (prop = *plist; prop != NULL; prop = prop->next()) {
4185 if (strcmp(k, prop->key()) == 0) {
4186 if (append) {
4187 prop->append_value(v);
4188 } else {
4189 prop->set_writeable_value(v);
4190 }
4191 return;
4192 }
4193 }
4194
4195 PropertyList_add(plist, k, v);
4196 }
4197
4198 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4199 // Returns true if all of the source pointed by src has been copied over to
4200 // the destination buffer pointed by buf. Otherwise, returns false.
4201 // Notes:
4202 // 1. If the length (buflen) of the destination buffer excluding the
4203 // NULL terminator character is not long enough for holding the expanded
4204 // pid characters, it also returns false instead of returning the partially
4205 // expanded one.
4206 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4207 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4208 char* buf, size_t buflen) {
4209 const char* p = src;
4210 char* b = buf;
4211 const char* src_end = &src[srclen];
4212 char* buf_end = &buf[buflen - 1];
4213
4214 while (p < src_end && b < buf_end) {
4215 if (*p == '%') {
4216 switch (*(++p)) {
4217 case '%': // "%%" ==> "%"
4218 *b++ = *p++;
4219 break;
4220 case 'p': { // "%p" ==> current process id
4221 // buf_end points to the character before the last character so
4222 // that we could write '\0' to the end of the buffer.
4223 size_t buf_sz = buf_end - b + 1;
4224 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4225
4226 // if jio_snprintf fails or the buffer is not long enough to hold
4227 // the expanded pid, returns false.
4228 if (ret < 0 || ret >= (int)buf_sz) {
4229 return false;
4230 } else {
4231 b += ret;
4232 assert(*b == '\0', "fail in copy_expand_pid");
4233 if (p == src_end && b == buf_end + 1) {
4234 // reach the end of the buffer.
4235 return true;
4236 }
4237 }
4238 p++;
4239 break;
4240 }
4241 default :
4242 *b++ = '%';
4243 }
4244 } else {
4245 *b++ = *p++;
4246 }
4247 }
4248 *b = '\0';
4249 return (p == src_end); // return false if not all of the source was copied
4250 }