1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "code/codeCacheExtensions.hpp"
31 #include "gc/shared/cardTableRS.hpp"
32 #include "gc/shared/genCollectedHeap.hpp"
33 #include "gc/shared/referenceProcessor.hpp"
34 #include "gc/shared/taskqueue.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logTag.hpp"
37 #include "logging/logConfiguration.hpp"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/universe.inline.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "prims/jvmtiExport.hpp"
42 #include "runtime/arguments.hpp"
43 #include "runtime/arguments_ext.hpp"
44 #include "runtime/commandLineFlagConstraintList.hpp"
45 #include "runtime/commandLineFlagRangeList.hpp"
46 #include "runtime/globals.hpp"
47 #include "runtime/globals_extension.hpp"
48 #include "runtime/java.hpp"
49 #include "runtime/os.hpp"
50 #include "runtime/vm_version.hpp"
51 #include "services/management.hpp"
52 #include "services/memTracker.hpp"
53 #include "utilities/defaultStream.hpp"
54 #include "utilities/macros.hpp"
55 #include "utilities/stringUtils.hpp"
56 #if INCLUDE_JVMCI
57 #include "jvmci/jvmciRuntime.hpp"
58 #endif
59 #if INCLUDE_ALL_GCS
60 #include "gc/cms/compactibleFreeListSpace.hpp"
61 #include "gc/g1/g1CollectedHeap.inline.hpp"
62 #include "gc/parallel/parallelScavengeHeap.hpp"
63 #endif // INCLUDE_ALL_GCS
64
65 // Note: This is a special bug reporting site for the JVM
66 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
67 #define DEFAULT_JAVA_LAUNCHER "generic"
68
69 char* Arguments::_jvm_flags_file = NULL;
70 char** Arguments::_jvm_flags_array = NULL;
71 int Arguments::_num_jvm_flags = 0;
72 char** Arguments::_jvm_args_array = NULL;
73 int Arguments::_num_jvm_args = 0;
74 char* Arguments::_java_command = NULL;
75 SystemProperty* Arguments::_system_properties = NULL;
76 const char* Arguments::_gc_log_filename = NULL;
77 bool Arguments::_has_profile = false;
78 size_t Arguments::_conservative_max_heap_alignment = 0;
79 size_t Arguments::_min_heap_size = 0;
80 Arguments::Mode Arguments::_mode = _mixed;
81 bool Arguments::_java_compiler = false;
82 bool Arguments::_xdebug_mode = false;
83 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
84 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
85 int Arguments::_sun_java_launcher_pid = -1;
86 bool Arguments::_sun_java_launcher_is_altjvm = false;
87 int Arguments::_patch_dirs_count = 0;
88 char** Arguments::_patch_dirs = NULL;
89 int Arguments::_bootclassloader_append_index = -1;
90
91 // These parameters are reset in method parse_vm_init_args()
92 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
93 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
94 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
95 bool Arguments::_ClipInlining = ClipInlining;
96 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
97 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
98
99 char* Arguments::SharedArchivePath = NULL;
100
101 AgentLibraryList Arguments::_libraryList;
102 AgentLibraryList Arguments::_agentList;
103
104 abort_hook_t Arguments::_abort_hook = NULL;
105 exit_hook_t Arguments::_exit_hook = NULL;
106 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
107
108
109 SystemProperty *Arguments::_sun_boot_library_path = NULL;
110 SystemProperty *Arguments::_java_library_path = NULL;
111 SystemProperty *Arguments::_java_home = NULL;
112 SystemProperty *Arguments::_java_class_path = NULL;
113 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
114
115 PathString *Arguments::_system_boot_class_path = NULL;
116
117 char* Arguments::_ext_dirs = NULL;
118
119 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
120 // part of the option string.
121 static bool match_option(const JavaVMOption *option, const char* name,
122 const char** tail) {
123 size_t len = strlen(name);
124 if (strncmp(option->optionString, name, len) == 0) {
125 *tail = option->optionString + len;
126 return true;
127 } else {
128 return false;
129 }
130 }
131
132 // Check if 'option' matches 'name'. No "tail" is allowed.
133 static bool match_option(const JavaVMOption *option, const char* name) {
134 const char* tail = NULL;
135 bool result = match_option(option, name, &tail);
136 if (tail != NULL && *tail == '\0') {
137 return result;
138 } else {
139 return false;
140 }
141 }
142
143 // Return true if any of the strings in null-terminated array 'names' matches.
144 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
145 // the option must match exactly.
146 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
147 bool tail_allowed) {
148 for (/* empty */; *names != NULL; ++names) {
149 if (match_option(option, *names, tail)) {
150 if (**tail == '\0' || tail_allowed && **tail == ':') {
151 return true;
152 }
153 }
154 }
155 return false;
156 }
157
158 static void logOption(const char* opt) {
159 if (PrintVMOptions) {
160 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
161 }
162 }
163
164 // Process java launcher properties.
165 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
166 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
167 // sun.java.launcher.pid is defined.
168 // Must do this before setting up other system properties,
169 // as some of them may depend on launcher type.
170 for (int index = 0; index < args->nOptions; index++) {
171 const JavaVMOption* option = args->options + index;
172 const char* tail;
173
174 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
175 process_java_launcher_argument(tail, option->extraInfo);
176 continue;
177 }
178 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
179 if (strcmp(tail, "true") == 0) {
180 _sun_java_launcher_is_altjvm = true;
181 }
182 continue;
183 }
184 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
185 _sun_java_launcher_pid = atoi(tail);
186 continue;
187 }
188 }
189 }
190
191 // Initialize system properties key and value.
192 void Arguments::init_system_properties() {
193
194 // Set up _system_boot_class_path which is not a property but
195 // relies heavily on argument processing and the jdk.boot.class.path.append
196 // property. It is used to store the underlying system boot class path.
197 _system_boot_class_path = new PathString(NULL);
198
199 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
200 "Java Virtual Machine Specification", false));
201 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
202 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
203 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
204 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
205
206 // Following are JVMTI agent writable properties.
207 // Properties values are set to NULL and they are
208 // os specific they are initialized in os::init_system_properties_values().
209 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
210 _java_library_path = new SystemProperty("java.library.path", NULL, true);
211 _java_home = new SystemProperty("java.home", NULL, true);
212 _java_class_path = new SystemProperty("java.class.path", "", true);
213 // jdk.boot.class.path.append is a non-writeable, internal property.
214 // It can only be set by either:
215 // - -Xbootclasspath/a:
216 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
217 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
218
219 // Add to System Property list.
220 PropertyList_add(&_system_properties, _sun_boot_library_path);
221 PropertyList_add(&_system_properties, _java_library_path);
222 PropertyList_add(&_system_properties, _java_home);
223 PropertyList_add(&_system_properties, _java_class_path);
224 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
225
226 // Set OS specific system properties values
227 os::init_system_properties_values();
228 }
229
230 // Update/Initialize System properties after JDK version number is known
231 void Arguments::init_version_specific_system_properties() {
232 enum { bufsz = 16 };
233 char buffer[bufsz];
234 const char* spec_vendor = "Oracle Corporation";
235 uint32_t spec_version = JDK_Version::current().major_version();
236
237 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
238
239 PropertyList_add(&_system_properties,
240 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
241 PropertyList_add(&_system_properties,
242 new SystemProperty("java.vm.specification.version", buffer, false));
243 PropertyList_add(&_system_properties,
244 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
245 }
246
247 /*
248 * -XX argument processing:
249 *
250 * -XX arguments are defined in several places, such as:
251 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
252 * -XX arguments are parsed in parse_argument().
253 * -XX argument bounds checking is done in check_vm_args_consistency().
254 *
255 * Over time -XX arguments may change. There are mechanisms to handle common cases:
256 *
257 * ALIASED: An option that is simply another name for another option. This is often
258 * part of the process of deprecating a flag, but not all aliases need
259 * to be deprecated.
260 *
261 * Create an alias for an option by adding the old and new option names to the
262 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
263 *
264 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
265 * support may be removed in the future. Both regular and aliased options may be
266 * deprecated.
267 *
268 * Add a deprecation warning for an option (or alias) by adding an entry in the
269 * "special_jvm_flags" table and setting the "deprecated_in" field.
270 * Often an option "deprecated" in one major release will
271 * be made "obsolete" in the next. In this case the entry should also have it's
272 * "obsolete_in" field set.
273 *
274 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
275 * on the command line. A warning is printed to let the user know that option might not
276 * be accepted in the future.
277 *
278 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
279 * table and setting the "obsolete_in" field.
280 *
281 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
282 * to the current JDK version. The system will flatly refuse to admit the existence of
283 * the flag. This allows a flag to die automatically over JDK releases.
284 *
285 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
286 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
287 * - Newly obsolete or expired deprecated options should have their global variable
288 * definitions removed (from globals.hpp, etc) and related implementations removed.
289 *
290 * Recommended approach for removing options:
291 *
292 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
293 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
294 *
295 * To remove internal options (e.g. diagnostic, experimental, develop options), use
296 * a 2-step model adding major release numbers to the obsolete and expire columns.
297 *
298 * To change the name of an option, use the alias table as well as a 2-step
299 * model adding major release numbers to the deprecate and expire columns.
300 * Think twice about aliasing commonly used customer options.
301 *
302 * There are times when it is appropriate to leave a future release number as undefined.
303 *
304 * Tests: Aliases should be tested in VMAliasOptions.java.
305 * Deprecated options should be tested in VMDeprecatedOptions.java.
306 */
307
308 // Obsolete or deprecated -XX flag.
309 typedef struct {
310 const char* name;
311 JDK_Version deprecated_in; // When the deprecation warning started (or "undefined").
312 JDK_Version obsolete_in; // When the obsolete warning started (or "undefined").
313 JDK_Version expired_in; // When the option expires (or "undefined").
314 } SpecialFlag;
315
316 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
317 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
318 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
319 // the command-line as usual, but will issue a warning.
320 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
321 // the command-line, while issuing a warning and ignoring the flag value.
322 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
323 // existence of the flag.
324 //
325 // MANUAL CLEANUP ON JDK VERSION UPDATES:
326 // This table ensures that the handling of options will update automatically when the JDK
327 // version is incremented, but the source code needs to be cleanup up manually:
328 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
329 // variable should be removed, as well as users of the variable.
330 // - As "deprecated" options age into "obsolete" options, move the entry into the
331 // "Obsolete Flags" section of the table.
332 // - All expired options should be removed from the table.
333 static SpecialFlag const special_jvm_flags[] = {
334 // -------------- Deprecated Flags --------------
335 // --- Non-alias flags - sorted by obsolete_in then expired_in:
336 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
337 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
338 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
339 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
340
341 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
342 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
343 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
344 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
345 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
346 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
347 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
348 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
349
350 // -------------- Obsolete Flags - sorted by expired_in --------------
351 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
352 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
353 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
354 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
355 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
356 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
357 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
358 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
359 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
360 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
361 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
362 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
363 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
364 #ifndef ZERO
365 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
366 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
367 #endif // ZERO
368 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
369 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
370 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
371 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
372 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
373 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
374 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
375 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
376 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
377 { "SegmentedHeapDumpThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
378 { "PrintOopAddress", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
379
380 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
381 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
382 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
383 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
384 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
385 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
386 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
387 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
388 #endif
389
390 { NULL, JDK_Version(0), JDK_Version(0) }
391 };
392
393 // Flags that are aliases for other flags.
394 typedef struct {
395 const char* alias_name;
396 const char* real_name;
397 } AliasedFlag;
398
399 static AliasedFlag const aliased_jvm_flags[] = {
400 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
401 { "CMSMarkStackSizeMax", "MarkStackSizeMax" },
402 { "CMSMarkStackSize", "MarkStackSize" },
403 { "G1MarkStackSize", "MarkStackSize" },
404 { "ParallelMarkingThreads", "ConcGCThreads" },
405 { "ParallelCMSThreads", "ConcGCThreads" },
406 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
407 { NULL, NULL}
408 };
409
410 // NOTE: A compatibility request will be necessary for each alias to be removed.
411 static AliasedLoggingFlag const aliased_logging_flags[] = {
412 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
413 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
414 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(classload) },
415 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(classload, preorder) },
416 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(classpath) },
417 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(classresolve) },
418 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(classunload) },
419 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
420 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(classload, constraints) },
421 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
422 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepointcleanup) },
423 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
424 };
425
426 #ifndef PRODUCT
427 // These options are removed in jdk9. Remove this code for jdk10.
428 static AliasedFlag const removed_develop_logging_flags[] = {
429 { "TraceClassInitialization", "-Xlog:classinit" },
430 { "TraceClassLoaderData", "-Xlog:classloaderdata" },
431 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
432 { "TraceItables", "-Xlog:itables=debug" },
433 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
434 { "TraceSafepoint", "-Xlog:safepoint=debug" },
435 { "TraceStartupTime", "-Xlog:startuptime" },
436 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
437 { "PrintVtables", "-Xlog:vtables=debug" },
438 { "VerboseVerification", "-Xlog:verification" },
439 { NULL, NULL }
440 };
441 #endif //PRODUCT
442
443 // Return true if "v" is less than "other", where "other" may be "undefined".
444 static bool version_less_than(JDK_Version v, JDK_Version other) {
445 assert(!v.is_undefined(), "must be defined");
446 if (!other.is_undefined() && v.compare(other) >= 0) {
447 return false;
448 } else {
449 return true;
450 }
451 }
452
453 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
454 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
455 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
456 flag = special_jvm_flags[i];
457 return true;
458 }
459 }
460 return false;
461 }
462
463 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
464 assert(version != NULL, "Must provide a version buffer");
465 SpecialFlag flag;
466 if (lookup_special_flag(flag_name, flag)) {
467 if (!flag.obsolete_in.is_undefined()) {
468 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
469 *version = flag.obsolete_in;
470 return true;
471 }
472 }
473 }
474 return false;
475 }
476
477 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
478 assert(version != NULL, "Must provide a version buffer");
479 SpecialFlag flag;
480 if (lookup_special_flag(flag_name, flag)) {
481 if (!flag.deprecated_in.is_undefined()) {
482 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
483 version_less_than(JDK_Version::current(), flag.expired_in)) {
484 *version = flag.deprecated_in;
485 return 1;
486 } else {
487 return -1;
488 }
489 }
490 }
491 return 0;
492 }
493
494 #ifndef PRODUCT
495 const char* Arguments::removed_develop_logging_flag_name(const char* name){
496 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
497 const AliasedFlag& flag = removed_develop_logging_flags[i];
498 if (strcmp(flag.alias_name, name) == 0) {
499 return flag.real_name;
500 }
501 }
502 return NULL;
503 }
504 #endif // PRODUCT
505
506 const char* Arguments::real_flag_name(const char *flag_name) {
507 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
508 const AliasedFlag& flag_status = aliased_jvm_flags[i];
509 if (strcmp(flag_status.alias_name, flag_name) == 0) {
510 return flag_status.real_name;
511 }
512 }
513 return flag_name;
514 }
515
516 #ifdef ASSERT
517 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
518 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
519 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
520 return true;
521 }
522 }
523 return false;
524 }
525
526 static bool verify_special_jvm_flags() {
527 bool success = true;
528 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
529 const SpecialFlag& flag = special_jvm_flags[i];
530 if (lookup_special_flag(flag.name, i)) {
531 warning("Duplicate special flag declaration \"%s\"", flag.name);
532 success = false;
533 }
534 if (flag.deprecated_in.is_undefined() &&
535 flag.obsolete_in.is_undefined()) {
536 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
537 success = false;
538 }
539
540 if (!flag.deprecated_in.is_undefined()) {
541 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
542 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
543 success = false;
544 }
545
546 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
547 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
548 success = false;
549 }
550 }
551
552 if (!flag.obsolete_in.is_undefined()) {
553 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
554 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
555 success = false;
556 }
557
558 // if flag has become obsolete it should not have a "globals" flag defined anymore.
559 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
560 if (Flag::find_flag(flag.name) != NULL) {
561 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
562 success = false;
563 }
564 }
565 }
566
567 if (!flag.expired_in.is_undefined()) {
568 // if flag has become expired it should not have a "globals" flag defined anymore.
569 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
570 if (Flag::find_flag(flag.name) != NULL) {
571 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
572 success = false;
573 }
574 }
575 }
576
577 }
578 return success;
579 }
580 #endif
581
582 // Constructs the system boot class path from the following components, in order:
583 //
584 // prefix // from -Xpatch:...
585 // base // from os::get_system_properties()
586 // suffix // from -Xbootclasspath/a:...
587 //
588 // This could be AllStatic, but it isn't needed after argument processing is
589 // complete. After argument processing, the combined components are copied
590 // to Arguments::_system_boot_class_path via a call to Arguments::set_sysclasspath.
591 class ArgumentBootClassPath: public StackObj {
592 public:
593 ArgumentBootClassPath(const char* base);
594 ~ArgumentBootClassPath();
595
596 inline void set_base(const char* base);
597 inline void add_prefix(const char* prefix);
598 inline void add_suffix_to_prefix(const char* suffix);
599 inline void add_suffix(const char* suffix);
600 inline void reset_path(const char* base);
601
602 inline const char* get_base() const { return _items[_bcp_base]; }
603 inline const char* get_prefix() const { return _items[_bcp_prefix]; }
604 inline const char* get_suffix() const { return _items[_bcp_suffix]; }
605
606 // Combine all the components into a single c-heap-allocated string; caller
607 // must free the string if/when no longer needed.
608 char* combined_path();
609
610 private:
611 // Utility routines.
612 static char* add_to_path(const char* path, const char* str, bool prepend);
613 static char* add_jars_to_path(char* path, const char* directory);
614
615 inline void reset_item_at(int index);
616
617 // Array indices for the items that make up the sysclasspath. All except the
618 // base are allocated in the C heap and freed by this class.
619 enum {
620 _bcp_prefix, // was -Xpatch:...
621 _bcp_base, // the default system boot class path
622 _bcp_suffix, // from -Xbootclasspath/a:...
623 _bcp_nitems // the number of items, must be last.
624 };
625
626 const char* _items[_bcp_nitems];
627 };
628
629 ArgumentBootClassPath::ArgumentBootClassPath(const char* base) {
630 memset(_items, 0, sizeof(_items));
631 _items[_bcp_base] = base;
632 }
633
634 ArgumentBootClassPath::~ArgumentBootClassPath() {
635 // Free everything except the base.
636 for (int i = 0; i < _bcp_nitems; ++i) {
637 if (i != _bcp_base) reset_item_at(i);
638 }
639 }
640
641 inline void ArgumentBootClassPath::set_base(const char* base) {
642 _items[_bcp_base] = base;
643 }
644
645 inline void ArgumentBootClassPath::add_prefix(const char* prefix) {
646 _items[_bcp_prefix] = add_to_path(_items[_bcp_prefix], prefix, true);
647 }
648
649 inline void ArgumentBootClassPath::add_suffix_to_prefix(const char* suffix) {
650 _items[_bcp_prefix] = add_to_path(_items[_bcp_prefix], suffix, false);
651 }
652
653 inline void ArgumentBootClassPath::add_suffix(const char* suffix) {
654 _items[_bcp_suffix] = add_to_path(_items[_bcp_suffix], suffix, false);
655 }
656
657 inline void ArgumentBootClassPath::reset_item_at(int index) {
658 assert(index < _bcp_nitems && index != _bcp_base, "just checking");
659 if (_items[index] != NULL) {
660 FREE_C_HEAP_ARRAY(char, _items[index]);
661 _items[index] = NULL;
662 }
663 }
664
665 inline void ArgumentBootClassPath::reset_path(const char* base) {
666 // Clear the prefix and suffix.
667 reset_item_at(_bcp_prefix);
668 reset_item_at(_bcp_suffix);
669 set_base(base);
670 }
671
672 //------------------------------------------------------------------------------
673
674
675 // Combine the bootclasspath elements, some of which may be null, into a single
676 // c-heap-allocated string.
677 char* ArgumentBootClassPath::combined_path() {
678 assert(_items[_bcp_base] != NULL, "empty default sysclasspath");
679
680 size_t lengths[_bcp_nitems];
681 size_t total_len = 0;
682
683 const char separator = *os::path_separator();
684
685 // Get the lengths.
686 int i;
687 for (i = 0; i < _bcp_nitems; ++i) {
688 if (i == _bcp_suffix) {
689 // Record index of boot loader's append path.
690 Arguments::set_bootclassloader_append_index((int)total_len);
691 }
692 if (_items[i] != NULL) {
693 lengths[i] = strlen(_items[i]);
694 // Include space for the separator char (or a NULL for the last item).
695 total_len += lengths[i] + 1;
696 }
697 }
698 assert(total_len > 0, "empty sysclasspath not allowed");
699
700 // Copy the _items to a single string.
701 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtArguments);
702 char* cp_tmp = cp;
703 for (i = 0; i < _bcp_nitems; ++i) {
704 if (_items[i] != NULL) {
705 memcpy(cp_tmp, _items[i], lengths[i]);
706 cp_tmp += lengths[i];
707 *cp_tmp++ = separator;
708 }
709 }
710 *--cp_tmp = '\0'; // Replace the extra separator.
711 return cp;
712 }
713
714 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
715 char*
716 ArgumentBootClassPath::add_to_path(const char* path, const char* str, bool prepend) {
717 char *cp;
718
719 assert(str != NULL, "just checking");
720 if (path == NULL) {
721 size_t len = strlen(str) + 1;
722 cp = NEW_C_HEAP_ARRAY(char, len, mtArguments);
723 memcpy(cp, str, len); // copy the trailing null
724 } else {
725 const char separator = *os::path_separator();
726 size_t old_len = strlen(path);
727 size_t str_len = strlen(str);
728 size_t len = old_len + str_len + 2;
729
730 if (prepend) {
731 cp = NEW_C_HEAP_ARRAY(char, len, mtArguments);
732 char* cp_tmp = cp;
733 memcpy(cp_tmp, str, str_len);
734 cp_tmp += str_len;
735 *cp_tmp = separator;
736 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
737 FREE_C_HEAP_ARRAY(char, path);
738 } else {
739 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtArguments);
740 char* cp_tmp = cp + old_len;
741 *cp_tmp = separator;
742 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
743 }
744 }
745 return cp;
746 }
747
748 // Scan the directory and append any jar or zip files found to path.
749 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
750 char* ArgumentBootClassPath::add_jars_to_path(char* path, const char* directory) {
751 DIR* dir = os::opendir(directory);
752 if (dir == NULL) return path;
753
754 char dir_sep[2] = { '\0', '\0' };
755 size_t directory_len = strlen(directory);
756 const char fileSep = *os::file_separator();
757 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
758
759 /* Scan the directory for jars/zips, appending them to path. */
760 struct dirent *entry;
761 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
762 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
763 const char* name = entry->d_name;
764 const char* ext = name + strlen(name) - 4;
765 bool isJarOrZip = ext > name &&
766 (os::file_name_strcmp(ext, ".jar") == 0 ||
767 os::file_name_strcmp(ext, ".zip") == 0);
768 if (isJarOrZip) {
769 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtArguments);
770 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
771 path = add_to_path(path, jarpath, false);
772 FREE_C_HEAP_ARRAY(char, jarpath);
773 }
774 }
775 FREE_C_HEAP_ARRAY(char, dbuf);
776 os::closedir(dir);
777 return path;
778 }
779
780 // Parses a size specification string.
781 bool Arguments::atojulong(const char *s, julong* result) {
782 julong n = 0;
783 int args_read = 0;
784 bool is_hex = false;
785 // Skip leading 0[xX] for hexadecimal
786 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
787 s += 2;
788 is_hex = true;
789 args_read = sscanf(s, JULONG_FORMAT_X, &n);
790 } else {
791 args_read = sscanf(s, JULONG_FORMAT, &n);
792 }
793 if (args_read != 1) {
794 return false;
795 }
796 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
797 s++;
798 }
799 // 4705540: illegal if more characters are found after the first non-digit
800 if (strlen(s) > 1) {
801 return false;
802 }
803 switch (*s) {
804 case 'T': case 't':
805 *result = n * G * K;
806 // Check for overflow.
807 if (*result/((julong)G * K) != n) return false;
808 return true;
809 case 'G': case 'g':
810 *result = n * G;
811 if (*result/G != n) return false;
812 return true;
813 case 'M': case 'm':
814 *result = n * M;
815 if (*result/M != n) return false;
816 return true;
817 case 'K': case 'k':
818 *result = n * K;
819 if (*result/K != n) return false;
820 return true;
821 case '\0':
822 *result = n;
823 return true;
824 default:
825 return false;
826 }
827 }
828
829 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
830 if (size < min_size) return arg_too_small;
831 // Check that size will fit in a size_t (only relevant on 32-bit)
832 if (size > max_uintx) return arg_too_big;
833 return arg_in_range;
834 }
835
836 // Describe an argument out of range error
837 void Arguments::describe_range_error(ArgsRange errcode) {
838 switch(errcode) {
839 case arg_too_big:
840 jio_fprintf(defaultStream::error_stream(),
841 "The specified size exceeds the maximum "
842 "representable size.\n");
843 break;
844 case arg_too_small:
845 case arg_unreadable:
846 case arg_in_range:
847 // do nothing for now
848 break;
849 default:
850 ShouldNotReachHere();
851 }
852 }
853
854 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
855 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
856 return true;
857 } else {
858 return false;
859 }
860 }
861
862 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
863 char* end;
864 errno = 0;
865 double v = strtod(value, &end);
866 if ((errno != 0) || (*end != 0)) {
867 return false;
868 }
869
870 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
871 return true;
872 }
873 return false;
874 }
875
876 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
877 julong v;
878 int int_v;
879 intx intx_v;
880 bool is_neg = false;
881 Flag* result = Flag::find_flag(name, strlen(name));
882
883 if (result == NULL) {
884 return false;
885 }
886
887 // Check the sign first since atojulong() parses only unsigned values.
888 if (*value == '-') {
889 if (!result->is_intx() && !result->is_int()) {
890 return false;
891 }
892 value++;
893 is_neg = true;
894 }
895 if (!Arguments::atojulong(value, &v)) {
896 return false;
897 }
898 if (result->is_int()) {
899 int_v = (int) v;
900 if (is_neg) {
901 int_v = -int_v;
902 }
903 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
904 } else if (result->is_uint()) {
905 uint uint_v = (uint) v;
906 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
907 } else if (result->is_intx()) {
908 intx_v = (intx) v;
909 if (is_neg) {
910 intx_v = -intx_v;
911 }
912 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
913 } else if (result->is_uintx()) {
914 uintx uintx_v = (uintx) v;
915 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
916 } else if (result->is_uint64_t()) {
917 uint64_t uint64_t_v = (uint64_t) v;
918 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
919 } else if (result->is_size_t()) {
920 size_t size_t_v = (size_t) v;
921 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
922 } else {
923 return false;
924 }
925 }
926
927 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
928 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
929 // Contract: CommandLineFlags always returns a pointer that needs freeing.
930 FREE_C_HEAP_ARRAY(char, value);
931 return true;
932 }
933
934 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
935 const char* old_value = "";
936 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
937 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
938 size_t new_len = strlen(new_value);
939 const char* value;
940 char* free_this_too = NULL;
941 if (old_len == 0) {
942 value = new_value;
943 } else if (new_len == 0) {
944 value = old_value;
945 } else {
946 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtArguments);
947 // each new setting adds another LINE to the switch:
948 sprintf(buf, "%s\n%s", old_value, new_value);
949 value = buf;
950 free_this_too = buf;
951 }
952 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
953 // CommandLineFlags always returns a pointer that needs freeing.
954 FREE_C_HEAP_ARRAY(char, value);
955 if (free_this_too != NULL) {
956 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
957 FREE_C_HEAP_ARRAY(char, free_this_too);
958 }
959 return true;
960 }
961
962 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
963 const char* real_name = real_flag_name(arg);
964 JDK_Version since = JDK_Version();
965 switch (is_deprecated_flag(arg, &since)) {
966 case -1:
967 return NULL; // obsolete or expired, don't process normally
968 case 0:
969 return real_name;
970 case 1: {
971 if (warn) {
972 char version[256];
973 since.to_string(version, sizeof(version));
974 if (real_name != arg) {
975 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
976 arg, version, real_name);
977 } else {
978 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
979 arg, version);
980 }
981 }
982 return real_name;
983 }
984 }
985 ShouldNotReachHere();
986 return NULL;
987 }
988
989 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
990 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
991 // Set tagset string buffer at max size of 256, large enough for any alias tagset
992 const int max_tagset_size = 256;
993 int max_tagset_len = max_tagset_size - 1;
994 char tagset_buffer[max_tagset_size];
995 tagset_buffer[0] = '\0';
996
997 // Write tag-set for aliased logging option, in string list form
998 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
999 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
1000 if (i > 0) {
1001 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
1002 }
1003 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
1004 }
1005
1006 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
1007 (on) ? "+" : "-",
1008 name,
1009 tagset_buffer,
1010 (on) ? LogLevel::name(alf.level) : "off");
1011 }
1012
1013 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1014 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1015 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1016 if (strcmp(alf.alias_name, name) == 0) {
1017 log_deprecated_flag(name, on, alf);
1018 return alf;
1019 }
1020 }
1021 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1022 return a;
1023 }
1024
1025 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
1026
1027 // range of acceptable characters spelled out for portability reasons
1028 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1029 #define BUFLEN 255
1030 char name[BUFLEN+1];
1031 char dummy;
1032 const char* real_name;
1033 bool warn_if_deprecated = true;
1034
1035 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1036 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1037 if (alf.alias_name != NULL){
1038 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1039 return true;
1040 }
1041 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1042 if (real_name == NULL) {
1043 return false;
1044 }
1045 return set_bool_flag(real_name, false, origin);
1046 }
1047 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1048 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1049 if (alf.alias_name != NULL){
1050 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1051 return true;
1052 }
1053 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1054 if (real_name == NULL) {
1055 return false;
1056 }
1057 return set_bool_flag(real_name, true, origin);
1058 }
1059
1060 char punct;
1061 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1062 const char* value = strchr(arg, '=') + 1;
1063 Flag* flag;
1064
1065 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1066 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1067 if (real_name == NULL) {
1068 return false;
1069 }
1070 flag = Flag::find_flag(real_name);
1071 if (flag != NULL && flag->is_ccstr()) {
1072 if (flag->ccstr_accumulates()) {
1073 return append_to_string_flag(real_name, value, origin);
1074 } else {
1075 if (value[0] == '\0') {
1076 value = NULL;
1077 }
1078 return set_string_flag(real_name, value, origin);
1079 }
1080 } else {
1081 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1082 }
1083 }
1084
1085 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1086 const char* value = strchr(arg, '=') + 1;
1087 // -XX:Foo:=xxx will reset the string flag to the given value.
1088 if (value[0] == '\0') {
1089 value = NULL;
1090 }
1091 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1092 if (real_name == NULL) {
1093 return false;
1094 }
1095 return set_string_flag(real_name, value, origin);
1096 }
1097
1098 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1099 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1100 #define NUMBER_RANGE "[0123456789eE+-]"
1101 char value[BUFLEN + 1];
1102 char value2[BUFLEN + 1];
1103 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1104 // Looks like a floating-point number -- try again with more lenient format string
1105 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1106 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1107 if (real_name == NULL) {
1108 return false;
1109 }
1110 return set_fp_numeric_flag(real_name, value, origin);
1111 }
1112 }
1113
1114 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1115 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1116 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1117 if (real_name == NULL) {
1118 return false;
1119 }
1120 return set_numeric_flag(real_name, value, origin);
1121 }
1122
1123 return false;
1124 }
1125
1126 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1127 assert(bldarray != NULL, "illegal argument");
1128
1129 if (arg == NULL) {
1130 return;
1131 }
1132
1133 int new_count = *count + 1;
1134
1135 // expand the array and add arg to the last element
1136 if (*bldarray == NULL) {
1137 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1138 } else {
1139 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1140 }
1141 (*bldarray)[*count] = os::strdup_check_oom(arg);
1142 *count = new_count;
1143 }
1144
1145 void Arguments::build_jvm_args(const char* arg) {
1146 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1147 }
1148
1149 void Arguments::build_jvm_flags(const char* arg) {
1150 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1151 }
1152
1153 // utility function to return a string that concatenates all
1154 // strings in a given char** array
1155 const char* Arguments::build_resource_string(char** args, int count) {
1156 if (args == NULL || count == 0) {
1157 return NULL;
1158 }
1159 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
1160 for (int i = 1; i < count; i++) {
1161 length += strlen(args[i]) + 1; // add 1 for a space
1162 }
1163 char* s = NEW_RESOURCE_ARRAY(char, length);
1164 strcpy(s, args[0]);
1165 for (int j = 1; j < count; j++) {
1166 strcat(s, " ");
1167 strcat(s, args[j]);
1168 }
1169 return (const char*) s;
1170 }
1171
1172 void Arguments::print_on(outputStream* st) {
1173 st->print_cr("VM Arguments:");
1174 if (num_jvm_flags() > 0) {
1175 st->print("jvm_flags: "); print_jvm_flags_on(st);
1176 st->cr();
1177 }
1178 if (num_jvm_args() > 0) {
1179 st->print("jvm_args: "); print_jvm_args_on(st);
1180 st->cr();
1181 }
1182 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1183 if (_java_class_path != NULL) {
1184 char* path = _java_class_path->value();
1185 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1186 }
1187 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1188 }
1189
1190 void Arguments::print_summary_on(outputStream* st) {
1191 // Print the command line. Environment variables that are helpful for
1192 // reproducing the problem are written later in the hs_err file.
1193 // flags are from setting file
1194 if (num_jvm_flags() > 0) {
1195 st->print_raw("Settings File: ");
1196 print_jvm_flags_on(st);
1197 st->cr();
1198 }
1199 // args are the command line and environment variable arguments.
1200 st->print_raw("Command Line: ");
1201 if (num_jvm_args() > 0) {
1202 print_jvm_args_on(st);
1203 }
1204 // this is the classfile and any arguments to the java program
1205 if (java_command() != NULL) {
1206 st->print("%s", java_command());
1207 }
1208 st->cr();
1209 }
1210
1211 void Arguments::print_jvm_flags_on(outputStream* st) {
1212 if (_num_jvm_flags > 0) {
1213 for (int i=0; i < _num_jvm_flags; i++) {
1214 st->print("%s ", _jvm_flags_array[i]);
1215 }
1216 }
1217 }
1218
1219 void Arguments::print_jvm_args_on(outputStream* st) {
1220 if (_num_jvm_args > 0) {
1221 for (int i=0; i < _num_jvm_args; i++) {
1222 st->print("%s ", _jvm_args_array[i]);
1223 }
1224 }
1225 }
1226
1227 bool Arguments::process_argument(const char* arg,
1228 jboolean ignore_unrecognized,
1229 Flag::Flags origin) {
1230 JDK_Version since = JDK_Version();
1231
1232 if (parse_argument(arg, origin)) {
1233 return true;
1234 }
1235
1236 // Determine if the flag has '+', '-', or '=' characters.
1237 bool has_plus_minus = (*arg == '+' || *arg == '-');
1238 const char* const argname = has_plus_minus ? arg + 1 : arg;
1239
1240 size_t arg_len;
1241 const char* equal_sign = strchr(argname, '=');
1242 if (equal_sign == NULL) {
1243 arg_len = strlen(argname);
1244 } else {
1245 arg_len = equal_sign - argname;
1246 }
1247
1248 // Only make the obsolete check for valid arguments.
1249 if (arg_len <= BUFLEN) {
1250 // Construct a string which consists only of the argument name without '+', '-', or '='.
1251 char stripped_argname[BUFLEN+1];
1252 strncpy(stripped_argname, argname, arg_len);
1253 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate.
1254 if (is_obsolete_flag(stripped_argname, &since)) {
1255 char version[256];
1256 since.to_string(version, sizeof(version));
1257 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1258 return true;
1259 }
1260 #ifndef PRODUCT
1261 else {
1262 const char* replacement;
1263 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1264 log_warning(arguments)("%s has been removed. Please use %s instead.",
1265 stripped_argname,
1266 replacement);
1267 return false;
1268 }
1269 }
1270 #endif //PRODUCT
1271 }
1272
1273 // For locked flags, report a custom error message if available.
1274 // Otherwise, report the standard unrecognized VM option.
1275 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1276 if (found_flag != NULL) {
1277 char locked_message_buf[BUFLEN];
1278 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1279 if (strlen(locked_message_buf) == 0) {
1280 if (found_flag->is_bool() && !has_plus_minus) {
1281 jio_fprintf(defaultStream::error_stream(),
1282 "Missing +/- setting for VM option '%s'\n", argname);
1283 } else if (!found_flag->is_bool() && has_plus_minus) {
1284 jio_fprintf(defaultStream::error_stream(),
1285 "Unexpected +/- setting in VM option '%s'\n", argname);
1286 } else {
1287 jio_fprintf(defaultStream::error_stream(),
1288 "Improperly specified VM option '%s'\n", argname);
1289 }
1290 } else {
1291 #ifdef PRODUCT
1292 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1293 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1294 if (ignore_unrecognized && mismatched) {
1295 return true;
1296 }
1297 #endif
1298 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1299 }
1300 } else {
1301 if (ignore_unrecognized) {
1302 return true;
1303 }
1304 jio_fprintf(defaultStream::error_stream(),
1305 "Unrecognized VM option '%s'\n", argname);
1306 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1307 if (fuzzy_matched != NULL) {
1308 jio_fprintf(defaultStream::error_stream(),
1309 "Did you mean '%s%s%s'? ",
1310 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1311 fuzzy_matched->_name,
1312 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1313 }
1314 }
1315
1316 // allow for commandline "commenting out" options like -XX:#+Verbose
1317 return arg[0] == '#';
1318 }
1319
1320 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1321 FILE* stream = fopen(file_name, "rb");
1322 if (stream == NULL) {
1323 if (should_exist) {
1324 jio_fprintf(defaultStream::error_stream(),
1325 "Could not open settings file %s\n", file_name);
1326 return false;
1327 } else {
1328 return true;
1329 }
1330 }
1331
1332 char token[1024];
1333 int pos = 0;
1334
1335 bool in_white_space = true;
1336 bool in_comment = false;
1337 bool in_quote = false;
1338 char quote_c = 0;
1339 bool result = true;
1340
1341 int c = getc(stream);
1342 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1343 if (in_white_space) {
1344 if (in_comment) {
1345 if (c == '\n') in_comment = false;
1346 } else {
1347 if (c == '#') in_comment = true;
1348 else if (!isspace(c)) {
1349 in_white_space = false;
1350 token[pos++] = c;
1351 }
1352 }
1353 } else {
1354 if (c == '\n' || (!in_quote && isspace(c))) {
1355 // token ends at newline, or at unquoted whitespace
1356 // this allows a way to include spaces in string-valued options
1357 token[pos] = '\0';
1358 logOption(token);
1359 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1360 build_jvm_flags(token);
1361 pos = 0;
1362 in_white_space = true;
1363 in_quote = false;
1364 } else if (!in_quote && (c == '\'' || c == '"')) {
1365 in_quote = true;
1366 quote_c = c;
1367 } else if (in_quote && (c == quote_c)) {
1368 in_quote = false;
1369 } else {
1370 token[pos++] = c;
1371 }
1372 }
1373 c = getc(stream);
1374 }
1375 if (pos > 0) {
1376 token[pos] = '\0';
1377 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1378 build_jvm_flags(token);
1379 }
1380 fclose(stream);
1381 return result;
1382 }
1383
1384 //=============================================================================================================
1385 // Parsing of properties (-D)
1386
1387 const char* Arguments::get_property(const char* key) {
1388 return PropertyList_get_value(system_properties(), key);
1389 }
1390
1391 bool Arguments::add_property(const char* prop) {
1392 const char* eq = strchr(prop, '=');
1393 const char* key;
1394 const char* value = "";
1395
1396 if (eq == NULL) {
1397 // property doesn't have a value, thus use passed string
1398 key = prop;
1399 } else {
1400 // property have a value, thus extract it and save to the
1401 // allocated string
1402 size_t key_len = eq - prop;
1403 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1404
1405 strncpy(tmp_key, prop, key_len);
1406 tmp_key[key_len] = '\0';
1407 key = tmp_key;
1408
1409 value = &prop[key_len + 1];
1410 }
1411
1412 if (strcmp(key, "java.compiler") == 0) {
1413 process_java_compiler_argument(value);
1414 // Record value in Arguments, but let it get passed to Java.
1415 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1416 strcmp(key, "sun.java.launcher.pid") == 0) {
1417 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1418 // private and are processed in process_sun_java_launcher_properties();
1419 // the sun.java.launcher property is passed on to the java application
1420 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1421 PropertyList_unique_add(&_system_properties, key, value, true);
1422 } else {
1423 if (strcmp(key, "sun.java.command") == 0) {
1424 char *old_java_command = _java_command;
1425 _java_command = os::strdup_check_oom(value, mtArguments);
1426 if (old_java_command != NULL) {
1427 os::free(old_java_command);
1428 }
1429 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1430 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1431 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1432 // its value without going through the property list or making a Java call.
1433 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1434 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1435 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1436 os::free((void *)old_java_vendor_url_bug);
1437 }
1438 }
1439
1440 // Create new property and add at the end of the list
1441 PropertyList_unique_add(&_system_properties, key, value);
1442 }
1443
1444 if (key != prop) {
1445 // SystemProperty copy passed value, thus free previously allocated
1446 // memory
1447 FreeHeap((void *)key);
1448 }
1449
1450 return true;
1451 }
1452
1453 // sets or adds a module name to the jdk.launcher.addmods property
1454 bool Arguments::append_to_addmods_property(const char* module_name) {
1455 const char* key = "jdk.launcher.addmods";
1456 const char* old_value = Arguments::get_property(key);
1457 size_t buf_len = strlen(key) + strlen(module_name) + 2;
1458 if (old_value != NULL) {
1459 buf_len += strlen(old_value) + 1;
1460 }
1461 char* new_value = AllocateHeap(buf_len, mtArguments);
1462 if (new_value == NULL) {
1463 return false;
1464 }
1465 if (old_value == NULL) {
1466 jio_snprintf(new_value, buf_len, "%s=%s", key, module_name);
1467 } else {
1468 jio_snprintf(new_value, buf_len, "%s=%s,%s", key, old_value, module_name);
1469 }
1470 bool added = add_property(new_value);
1471 FreeHeap(new_value);
1472 return added;
1473 }
1474
1475 #if INCLUDE_CDS
1476 void Arguments::check_unsupported_dumping_properties() {
1477 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1478 const char* unsupported_properties[5] = { "jdk.module.main",
1479 "jdk.module.path",
1480 "jdk.upgrade.module.path",
1481 "jdk.launcher.addmods",
1482 "jdk.launcher.limitmods" };
1483 const char* unsupported_options[5] = { "-m",
1484 "-modulepath",
1485 "-upgrademodulepath",
1486 "-addmods",
1487 "-limitmods" };
1488 SystemProperty* sp = system_properties();
1489 while (sp != NULL) {
1490 for (int i = 0; i < 5; i++) {
1491 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1492 vm_exit_during_initialization(
1493 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1494 }
1495 }
1496 sp = sp->next();
1497 }
1498 }
1499 #endif
1500
1501 //===========================================================================================================
1502 // Setting int/mixed/comp mode flags
1503
1504 void Arguments::set_mode_flags(Mode mode) {
1505 // Set up default values for all flags.
1506 // If you add a flag to any of the branches below,
1507 // add a default value for it here.
1508 set_java_compiler(false);
1509 _mode = mode;
1510
1511 // Ensure Agent_OnLoad has the correct initial values.
1512 // This may not be the final mode; mode may change later in onload phase.
1513 PropertyList_unique_add(&_system_properties, "java.vm.info",
1514 VM_Version::vm_info_string(), false);
1515
1516 UseInterpreter = true;
1517 UseCompiler = true;
1518 UseLoopCounter = true;
1519
1520 // Default values may be platform/compiler dependent -
1521 // use the saved values
1522 ClipInlining = Arguments::_ClipInlining;
1523 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1524 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1525 BackgroundCompilation = Arguments::_BackgroundCompilation;
1526 if (TieredCompilation) {
1527 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1528 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1529 }
1530 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1531 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1532 }
1533 }
1534
1535 // Change from defaults based on mode
1536 switch (mode) {
1537 default:
1538 ShouldNotReachHere();
1539 break;
1540 case _int:
1541 UseCompiler = false;
1542 UseLoopCounter = false;
1543 AlwaysCompileLoopMethods = false;
1544 UseOnStackReplacement = false;
1545 break;
1546 case _mixed:
1547 // same as default
1548 break;
1549 case _comp:
1550 UseInterpreter = false;
1551 BackgroundCompilation = false;
1552 ClipInlining = false;
1553 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1554 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1555 // compile a level 4 (C2) and then continue executing it.
1556 if (TieredCompilation) {
1557 Tier3InvokeNotifyFreqLog = 0;
1558 Tier4InvocationThreshold = 0;
1559 }
1560 break;
1561 }
1562 }
1563
1564 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS
1565 // Conflict: required to use shared spaces (-Xshare:on), but
1566 // incompatible command line options were chosen.
1567
1568 static void no_shared_spaces(const char* message) {
1569 if (RequireSharedSpaces) {
1570 jio_fprintf(defaultStream::error_stream(),
1571 "Class data sharing is inconsistent with other specified options.\n");
1572 vm_exit_during_initialization("Unable to use shared archive.", message);
1573 } else {
1574 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1575 }
1576 }
1577 #endif
1578
1579 // Returns threshold scaled with the value of scale.
1580 // If scale < 0.0, threshold is returned without scaling.
1581 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1582 if (scale == 1.0 || scale < 0.0) {
1583 return threshold;
1584 } else {
1585 return (intx)(threshold * scale);
1586 }
1587 }
1588
1589 // Returns freq_log scaled with the value of scale.
1590 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1591 // If scale < 0.0, freq_log is returned without scaling.
1592 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1593 // Check if scaling is necessary or if negative value was specified.
1594 if (scale == 1.0 || scale < 0.0) {
1595 return freq_log;
1596 }
1597 // Check values to avoid calculating log2 of 0.
1598 if (scale == 0.0 || freq_log == 0) {
1599 return 0;
1600 }
1601 // Determine the maximum notification frequency value currently supported.
1602 // The largest mask value that the interpreter/C1 can handle is
1603 // of length InvocationCounter::number_of_count_bits. Mask values are always
1604 // one bit shorter then the value of the notification frequency. Set
1605 // max_freq_bits accordingly.
1606 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1607 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1608 if (scaled_freq == 0) {
1609 // Return 0 right away to avoid calculating log2 of 0.
1610 return 0;
1611 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1612 return max_freq_bits;
1613 } else {
1614 return log2_intptr(scaled_freq);
1615 }
1616 }
1617
1618 void Arguments::set_tiered_flags() {
1619 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1620 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1621 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1622 }
1623 if (CompilationPolicyChoice < 2) {
1624 vm_exit_during_initialization(
1625 "Incompatible compilation policy selected", NULL);
1626 }
1627 // Increase the code cache size - tiered compiles a lot more.
1628 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1629 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1630 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1631 }
1632 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1633 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1634 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1635 }
1636 if (!UseInterpreter) { // -Xcomp
1637 Tier3InvokeNotifyFreqLog = 0;
1638 Tier4InvocationThreshold = 0;
1639 }
1640
1641 if (CompileThresholdScaling < 0) {
1642 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1643 }
1644
1645 // Scale tiered compilation thresholds.
1646 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1647 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1648 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1649 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1650
1651 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1652 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1653 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1654 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1655
1656 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1657 // once these thresholds become supported.
1658
1659 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1660 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1661
1662 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1663 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1664
1665 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1666
1667 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1668 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1669 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1670 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1671 }
1672 }
1673
1674 #if INCLUDE_ALL_GCS
1675 static void disable_adaptive_size_policy(const char* collector_name) {
1676 if (UseAdaptiveSizePolicy) {
1677 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1678 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1679 collector_name);
1680 }
1681 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1682 }
1683 }
1684
1685 void Arguments::set_parnew_gc_flags() {
1686 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1687 "control point invariant");
1688 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1689 assert(UseParNewGC, "ParNew should always be used with CMS");
1690
1691 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1692 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1693 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1694 } else if (ParallelGCThreads == 0) {
1695 jio_fprintf(defaultStream::error_stream(),
1696 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1697 vm_exit(1);
1698 }
1699
1700 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1701 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1702 // we set them to 1024 and 1024.
1703 // See CR 6362902.
1704 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1705 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1706 }
1707 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1708 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1709 }
1710
1711 // When using compressed oops, we use local overflow stacks,
1712 // rather than using a global overflow list chained through
1713 // the klass word of the object's pre-image.
1714 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1715 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1716 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1717 }
1718 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1719 }
1720 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1721 }
1722
1723 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1724 // sparc/solaris for certain applications, but would gain from
1725 // further optimization and tuning efforts, and would almost
1726 // certainly gain from analysis of platform and environment.
1727 void Arguments::set_cms_and_parnew_gc_flags() {
1728 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1729 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1730 assert(UseParNewGC, "ParNew should always be used with CMS");
1731
1732 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1733 disable_adaptive_size_policy("UseConcMarkSweepGC");
1734
1735 set_parnew_gc_flags();
1736
1737 size_t max_heap = align_size_down(MaxHeapSize,
1738 CardTableRS::ct_max_alignment_constraint());
1739
1740 // Now make adjustments for CMS
1741 intx tenuring_default = (intx)6;
1742 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1743
1744 // Preferred young gen size for "short" pauses:
1745 // upper bound depends on # of threads and NewRatio.
1746 const size_t preferred_max_new_size_unaligned =
1747 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1748 size_t preferred_max_new_size =
1749 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1750
1751 // Unless explicitly requested otherwise, size young gen
1752 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1753
1754 // If either MaxNewSize or NewRatio is set on the command line,
1755 // assume the user is trying to set the size of the young gen.
1756 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1757
1758 // Set MaxNewSize to our calculated preferred_max_new_size unless
1759 // NewSize was set on the command line and it is larger than
1760 // preferred_max_new_size.
1761 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1762 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1763 } else {
1764 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1765 }
1766 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1767
1768 // Code along this path potentially sets NewSize and OldSize
1769 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1770 min_heap_size(), InitialHeapSize, max_heap);
1771 size_t min_new = preferred_max_new_size;
1772 if (FLAG_IS_CMDLINE(NewSize)) {
1773 min_new = NewSize;
1774 }
1775 if (max_heap > min_new && min_heap_size() > min_new) {
1776 // Unless explicitly requested otherwise, make young gen
1777 // at least min_new, and at most preferred_max_new_size.
1778 if (FLAG_IS_DEFAULT(NewSize)) {
1779 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1780 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1781 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1782 }
1783 // Unless explicitly requested otherwise, size old gen
1784 // so it's NewRatio x of NewSize.
1785 if (FLAG_IS_DEFAULT(OldSize)) {
1786 if (max_heap > NewSize) {
1787 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1788 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1789 }
1790 }
1791 }
1792 }
1793 // Unless explicitly requested otherwise, definitely
1794 // promote all objects surviving "tenuring_default" scavenges.
1795 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1796 FLAG_IS_DEFAULT(SurvivorRatio)) {
1797 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1798 }
1799 // If we decided above (or user explicitly requested)
1800 // `promote all' (via MaxTenuringThreshold := 0),
1801 // prefer minuscule survivor spaces so as not to waste
1802 // space for (non-existent) survivors
1803 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1804 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1805 }
1806
1807 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1808 // but rather the number of free blocks of a given size that are used when
1809 // replenishing the local per-worker free list caches.
1810 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1811 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1812 // OldPLAB sizing manually turned off: Use a larger default setting,
1813 // unless it was manually specified. This is because a too-low value
1814 // will slow down scavenges.
1815 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1816 } else {
1817 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1818 }
1819 }
1820
1821 // If either of the static initialization defaults have changed, note this
1822 // modification.
1823 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1824 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1825 }
1826
1827 if (!ClassUnloading) {
1828 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1829 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1830 }
1831
1832 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1833 log_trace(gc)("ConcGCThreads: %u", ConcGCThreads);
1834 }
1835 #endif // INCLUDE_ALL_GCS
1836
1837 void set_object_alignment() {
1838 // Object alignment.
1839 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1840 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1841 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1842 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1843 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1844 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1845
1846 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1847 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1848
1849 // Oop encoding heap max
1850 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1851
1852 if (SurvivorAlignmentInBytes == 0) {
1853 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1854 }
1855
1856 #if INCLUDE_ALL_GCS
1857 // Set CMS global values
1858 CompactibleFreeListSpace::set_cms_values();
1859 #endif // INCLUDE_ALL_GCS
1860 }
1861
1862 size_t Arguments::max_heap_for_compressed_oops() {
1863 // Avoid sign flip.
1864 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1865 // We need to fit both the NULL page and the heap into the memory budget, while
1866 // keeping alignment constraints of the heap. To guarantee the latter, as the
1867 // NULL page is located before the heap, we pad the NULL page to the conservative
1868 // maximum alignment that the GC may ever impose upon the heap.
1869 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1870 _conservative_max_heap_alignment);
1871
1872 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1873 NOT_LP64(ShouldNotReachHere(); return 0);
1874 }
1875
1876 bool Arguments::should_auto_select_low_pause_collector() {
1877 if (UseAutoGCSelectPolicy &&
1878 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1879 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1880 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1881 return true;
1882 }
1883 return false;
1884 }
1885
1886 void Arguments::set_use_compressed_oops() {
1887 #ifndef ZERO
1888 #ifdef _LP64
1889 // MaxHeapSize is not set up properly at this point, but
1890 // the only value that can override MaxHeapSize if we are
1891 // to use UseCompressedOops is InitialHeapSize.
1892 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1893
1894 if (max_heap_size <= max_heap_for_compressed_oops()) {
1895 #if !defined(COMPILER1) || defined(TIERED)
1896 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1897 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1898 }
1899 #endif
1900 } else {
1901 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1902 warning("Max heap size too large for Compressed Oops");
1903 FLAG_SET_DEFAULT(UseCompressedOops, false);
1904 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1905 }
1906 }
1907 #endif // _LP64
1908 #endif // ZERO
1909 }
1910
1911
1912 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1913 // set_use_compressed_oops().
1914 void Arguments::set_use_compressed_klass_ptrs() {
1915 #ifndef ZERO
1916 #ifdef _LP64
1917 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1918 if (!UseCompressedOops) {
1919 if (UseCompressedClassPointers) {
1920 warning("UseCompressedClassPointers requires UseCompressedOops");
1921 }
1922 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1923 } else {
1924 // Turn on UseCompressedClassPointers too
1925 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1926 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1927 }
1928 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1929 if (UseCompressedClassPointers) {
1930 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1931 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1932 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1933 }
1934 }
1935 }
1936 #endif // _LP64
1937 #endif // !ZERO
1938 }
1939
1940 void Arguments::set_conservative_max_heap_alignment() {
1941 // The conservative maximum required alignment for the heap is the maximum of
1942 // the alignments imposed by several sources: any requirements from the heap
1943 // itself, the collector policy and the maximum page size we may run the VM
1944 // with.
1945 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1946 #if INCLUDE_ALL_GCS
1947 if (UseParallelGC) {
1948 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1949 } else if (UseG1GC) {
1950 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1951 }
1952 #endif // INCLUDE_ALL_GCS
1953 _conservative_max_heap_alignment = MAX4(heap_alignment,
1954 (size_t)os::vm_allocation_granularity(),
1955 os::max_page_size(),
1956 CollectorPolicy::compute_heap_alignment());
1957 }
1958
1959 bool Arguments::gc_selected() {
1960 #if INCLUDE_ALL_GCS
1961 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC;
1962 #else
1963 return UseSerialGC;
1964 #endif // INCLUDE_ALL_GCS
1965 }
1966
1967 void Arguments::select_gc_ergonomically() {
1968 #if INCLUDE_ALL_GCS
1969 if (os::is_server_class_machine()) {
1970 if (should_auto_select_low_pause_collector()) {
1971 FLAG_SET_ERGO_IF_DEFAULT(bool, UseConcMarkSweepGC, true);
1972 } else {
1973 #if defined(JAVASE_EMBEDDED)
1974 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParallelGC, true);
1975 #else
1976 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
1977 #endif
1978 }
1979 } else {
1980 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1981 }
1982 #else
1983 UNSUPPORTED_OPTION(UseG1GC);
1984 UNSUPPORTED_OPTION(UseParallelGC);
1985 UNSUPPORTED_OPTION(UseParallelOldGC);
1986 UNSUPPORTED_OPTION(UseConcMarkSweepGC);
1987 UNSUPPORTED_OPTION(UseParNewGC);
1988 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1989 #endif // INCLUDE_ALL_GCS
1990 }
1991
1992 void Arguments::select_gc() {
1993 if (!gc_selected()) {
1994 select_gc_ergonomically();
1995 if (!gc_selected()) {
1996 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL);
1997 }
1998 }
1999 }
2000
2001 void Arguments::set_ergonomics_flags() {
2002 select_gc();
2003
2004 #if defined(COMPILER2) || INCLUDE_JVMCI
2005 // Shared spaces work fine with other GCs but causes bytecode rewriting
2006 // to be disabled, which hurts interpreter performance and decreases
2007 // server performance. When -server is specified, keep the default off
2008 // unless it is asked for. Future work: either add bytecode rewriting
2009 // at link time, or rewrite bytecodes in non-shared methods.
2010 if (!DumpSharedSpaces && !RequireSharedSpaces &&
2011 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
2012 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
2013 }
2014 #endif
2015
2016 set_conservative_max_heap_alignment();
2017
2018 #ifndef ZERO
2019 #ifdef _LP64
2020 set_use_compressed_oops();
2021
2022 // set_use_compressed_klass_ptrs() must be called after calling
2023 // set_use_compressed_oops().
2024 set_use_compressed_klass_ptrs();
2025
2026 // Also checks that certain machines are slower with compressed oops
2027 // in vm_version initialization code.
2028 #endif // _LP64
2029 #endif // !ZERO
2030
2031 CodeCacheExtensions::set_ergonomics_flags();
2032 }
2033
2034 void Arguments::set_parallel_gc_flags() {
2035 assert(UseParallelGC || UseParallelOldGC, "Error");
2036 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
2037 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
2038 FLAG_SET_DEFAULT(UseParallelOldGC, true);
2039 }
2040 FLAG_SET_DEFAULT(UseParallelGC, true);
2041
2042 // If no heap maximum was requested explicitly, use some reasonable fraction
2043 // of the physical memory, up to a maximum of 1GB.
2044 FLAG_SET_DEFAULT(ParallelGCThreads,
2045 Abstract_VM_Version::parallel_worker_threads());
2046 if (ParallelGCThreads == 0) {
2047 jio_fprintf(defaultStream::error_stream(),
2048 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
2049 vm_exit(1);
2050 }
2051
2052 if (UseAdaptiveSizePolicy) {
2053 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
2054 // unless the user actually sets these flags.
2055 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
2056 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
2057 }
2058 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
2059 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
2060 }
2061 }
2062
2063 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
2064 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
2065 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
2066 // See CR 6362902 for details.
2067 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
2068 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
2069 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
2070 }
2071 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
2072 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
2073 }
2074 }
2075
2076 if (UseParallelOldGC) {
2077 // Par compact uses lower default values since they are treated as
2078 // minimums. These are different defaults because of the different
2079 // interpretation and are not ergonomically set.
2080 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
2081 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
2082 }
2083 }
2084 }
2085
2086 void Arguments::set_g1_gc_flags() {
2087 assert(UseG1GC, "Error");
2088 #if defined(COMPILER1) || INCLUDE_JVMCI
2089 FastTLABRefill = false;
2090 #endif
2091 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
2092 if (ParallelGCThreads == 0) {
2093 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
2094 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
2095 }
2096
2097 #if INCLUDE_ALL_GCS
2098 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) {
2099 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads);
2100 }
2101 #endif
2102
2103 // MarkStackSize will be set (if it hasn't been set by the user)
2104 // when concurrent marking is initialized.
2105 // Its value will be based upon the number of parallel marking threads.
2106 // But we do set the maximum mark stack size here.
2107 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
2108 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
2109 }
2110
2111 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
2112 // In G1, we want the default GC overhead goal to be higher than
2113 // it is for PS, or the heap might be expanded too aggressively.
2114 // We set it here to ~8%.
2115 FLAG_SET_DEFAULT(GCTimeRatio, 12);
2116 }
2117
2118 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
2119 log_trace(gc)("ConcGCThreads: %u", ConcGCThreads);
2120 }
2121
2122 void Arguments::set_gc_specific_flags() {
2123 #if INCLUDE_ALL_GCS
2124 // Set per-collector flags
2125 if (UseParallelGC || UseParallelOldGC) {
2126 set_parallel_gc_flags();
2127 } else if (UseConcMarkSweepGC) {
2128 set_cms_and_parnew_gc_flags();
2129 } else if (UseG1GC) {
2130 set_g1_gc_flags();
2131 }
2132 if (AssumeMP && !UseSerialGC) {
2133 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
2134 warning("If the number of processors is expected to increase from one, then"
2135 " you should configure the number of parallel GC threads appropriately"
2136 " using -XX:ParallelGCThreads=N");
2137 }
2138 }
2139 if (MinHeapFreeRatio == 100) {
2140 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2141 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
2142 }
2143 #endif // INCLUDE_ALL_GCS
2144 }
2145
2146 julong Arguments::limit_by_allocatable_memory(julong limit) {
2147 julong max_allocatable;
2148 julong result = limit;
2149 if (os::has_allocatable_memory_limit(&max_allocatable)) {
2150 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2151 }
2152 return result;
2153 }
2154
2155 // Use static initialization to get the default before parsing
2156 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2157
2158 void Arguments::set_heap_size() {
2159 const julong phys_mem =
2160 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2161 : (julong)MaxRAM;
2162
2163 // If the maximum heap size has not been set with -Xmx,
2164 // then set it as fraction of the size of physical memory,
2165 // respecting the maximum and minimum sizes of the heap.
2166 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2167 julong reasonable_max = phys_mem / MaxRAMFraction;
2168
2169 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2170 // Small physical memory, so use a minimum fraction of it for the heap
2171 reasonable_max = phys_mem / MinRAMFraction;
2172 } else {
2173 // Not-small physical memory, so require a heap at least
2174 // as large as MaxHeapSize
2175 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2176 }
2177 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2178 // Limit the heap size to ErgoHeapSizeLimit
2179 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2180 }
2181 if (UseCompressedOops) {
2182 // Limit the heap size to the maximum possible when using compressed oops
2183 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2184
2185 // HeapBaseMinAddress can be greater than default but not less than.
2186 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2187 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2188 // matches compressed oops printing flags
2189 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
2190 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
2191 DefaultHeapBaseMinAddress,
2192 DefaultHeapBaseMinAddress/G,
2193 HeapBaseMinAddress);
2194 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2195 }
2196 }
2197
2198 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2199 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2200 // but it should be not less than default MaxHeapSize.
2201 max_coop_heap -= HeapBaseMinAddress;
2202 }
2203 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2204 }
2205 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2206
2207 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2208 // An initial heap size was specified on the command line,
2209 // so be sure that the maximum size is consistent. Done
2210 // after call to limit_by_allocatable_memory because that
2211 // method might reduce the allocation size.
2212 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2213 }
2214
2215 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2216 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2217 }
2218
2219 // If the minimum or initial heap_size have not been set or requested to be set
2220 // ergonomically, set them accordingly.
2221 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2222 julong reasonable_minimum = (julong)(OldSize + NewSize);
2223
2224 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2225
2226 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2227
2228 if (InitialHeapSize == 0) {
2229 julong reasonable_initial = phys_mem / InitialRAMFraction;
2230
2231 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2232 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2233
2234 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2235
2236 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2237 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2238 }
2239 // If the minimum heap size has not been set (via -Xms),
2240 // synchronize with InitialHeapSize to avoid errors with the default value.
2241 if (min_heap_size() == 0) {
2242 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2243 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2244 }
2245 }
2246 }
2247
2248 // This option inspects the machine and attempts to set various
2249 // parameters to be optimal for long-running, memory allocation
2250 // intensive jobs. It is intended for machines with large
2251 // amounts of cpu and memory.
2252 jint Arguments::set_aggressive_heap_flags() {
2253 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2254 // VM, but we may not be able to represent the total physical memory
2255 // available (like having 8gb of memory on a box but using a 32bit VM).
2256 // Thus, we need to make sure we're using a julong for intermediate
2257 // calculations.
2258 julong initHeapSize;
2259 julong total_memory = os::physical_memory();
2260
2261 if (total_memory < (julong) 256 * M) {
2262 jio_fprintf(defaultStream::error_stream(),
2263 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2264 vm_exit(1);
2265 }
2266
2267 // The heap size is half of available memory, or (at most)
2268 // all of possible memory less 160mb (leaving room for the OS
2269 // when using ISM). This is the maximum; because adaptive sizing
2270 // is turned on below, the actual space used may be smaller.
2271
2272 initHeapSize = MIN2(total_memory / (julong) 2,
2273 total_memory - (julong) 160 * M);
2274
2275 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2276
2277 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2278 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2279 return JNI_EINVAL;
2280 }
2281 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2282 return JNI_EINVAL;
2283 }
2284 // Currently the minimum size and the initial heap sizes are the same.
2285 set_min_heap_size(initHeapSize);
2286 }
2287 if (FLAG_IS_DEFAULT(NewSize)) {
2288 // Make the young generation 3/8ths of the total heap.
2289 if (FLAG_SET_CMDLINE(size_t, NewSize,
2290 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2291 return JNI_EINVAL;
2292 }
2293 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2294 return JNI_EINVAL;
2295 }
2296 }
2297
2298 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2299 FLAG_SET_DEFAULT(UseLargePages, true);
2300 #endif
2301
2302 // Increase some data structure sizes for efficiency
2303 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2304 return JNI_EINVAL;
2305 }
2306 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2307 return JNI_EINVAL;
2308 }
2309 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2310 return JNI_EINVAL;
2311 }
2312
2313 // See the OldPLABSize comment below, but replace 'after promotion'
2314 // with 'after copying'. YoungPLABSize is the size of the survivor
2315 // space per-gc-thread buffers. The default is 4kw.
2316 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2317 return JNI_EINVAL;
2318 }
2319
2320 // OldPLABSize is the size of the buffers in the old gen that
2321 // UseParallelGC uses to promote live data that doesn't fit in the
2322 // survivor spaces. At any given time, there's one for each gc thread.
2323 // The default size is 1kw. These buffers are rarely used, since the
2324 // survivor spaces are usually big enough. For specjbb, however, there
2325 // are occasions when there's lots of live data in the young gen
2326 // and we end up promoting some of it. We don't have a definite
2327 // explanation for why bumping OldPLABSize helps, but the theory
2328 // is that a bigger PLAB results in retaining something like the
2329 // original allocation order after promotion, which improves mutator
2330 // locality. A minor effect may be that larger PLABs reduce the
2331 // number of PLAB allocation events during gc. The value of 8kw
2332 // was arrived at by experimenting with specjbb.
2333 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2334 return JNI_EINVAL;
2335 }
2336
2337 // Enable parallel GC and adaptive generation sizing
2338 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2339 return JNI_EINVAL;
2340 }
2341 FLAG_SET_DEFAULT(ParallelGCThreads,
2342 Abstract_VM_Version::parallel_worker_threads());
2343
2344 // Encourage steady state memory management
2345 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2346 return JNI_EINVAL;
2347 }
2348
2349 // This appears to improve mutator locality
2350 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2351 return JNI_EINVAL;
2352 }
2353
2354 // Get around early Solaris scheduling bug
2355 // (affinity vs other jobs on system)
2356 // but disallow DR and offlining (5008695).
2357 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2358 return JNI_EINVAL;
2359 }
2360
2361 return JNI_OK;
2362 }
2363
2364 // This must be called after ergonomics.
2365 void Arguments::set_bytecode_flags() {
2366 if (!RewriteBytecodes) {
2367 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2368 }
2369 }
2370
2371 // Aggressive optimization flags -XX:+AggressiveOpts
2372 jint Arguments::set_aggressive_opts_flags() {
2373 #ifdef COMPILER2
2374 if (AggressiveUnboxing) {
2375 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2376 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2377 } else if (!EliminateAutoBox) {
2378 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2379 AggressiveUnboxing = false;
2380 }
2381 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2382 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2383 } else if (!DoEscapeAnalysis) {
2384 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2385 AggressiveUnboxing = false;
2386 }
2387 }
2388 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2389 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2390 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2391 }
2392 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2393 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2394 }
2395
2396 // Feed the cache size setting into the JDK
2397 char buffer[1024];
2398 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2399 if (!add_property(buffer)) {
2400 return JNI_ENOMEM;
2401 }
2402 }
2403 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2404 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2405 }
2406 #endif
2407
2408 if (AggressiveOpts) {
2409 // Sample flag setting code
2410 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2411 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2412 // }
2413 }
2414
2415 return JNI_OK;
2416 }
2417
2418 //===========================================================================================================
2419 // Parsing of java.compiler property
2420
2421 void Arguments::process_java_compiler_argument(const char* arg) {
2422 // For backwards compatibility, Djava.compiler=NONE or ""
2423 // causes us to switch to -Xint mode UNLESS -Xdebug
2424 // is also specified.
2425 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2426 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2427 }
2428 }
2429
2430 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2431 _sun_java_launcher = os::strdup_check_oom(launcher);
2432 }
2433
2434 bool Arguments::created_by_java_launcher() {
2435 assert(_sun_java_launcher != NULL, "property must have value");
2436 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2437 }
2438
2439 bool Arguments::sun_java_launcher_is_altjvm() {
2440 return _sun_java_launcher_is_altjvm;
2441 }
2442
2443 //===========================================================================================================
2444 // Parsing of main arguments
2445
2446 #if INCLUDE_JVMCI
2447 // Check consistency of jvmci vm argument settings.
2448 bool Arguments::check_jvmci_args_consistency() {
2449 if (!EnableJVMCI && !JVMCIGlobals::check_jvmci_flags_are_consistent()) {
2450 JVMCIGlobals::print_jvmci_args_inconsistency_error_message();
2451 return false;
2452 }
2453 return true;
2454 }
2455 #endif //INCLUDE_JVMCI
2456
2457 // Check consistency of GC selection
2458 bool Arguments::check_gc_consistency() {
2459 // Ensure that the user has not selected conflicting sets
2460 // of collectors.
2461 uint i = 0;
2462 if (UseSerialGC) i++;
2463 if (UseConcMarkSweepGC) i++;
2464 if (UseParallelGC || UseParallelOldGC) i++;
2465 if (UseG1GC) i++;
2466 if (i > 1) {
2467 jio_fprintf(defaultStream::error_stream(),
2468 "Conflicting collector combinations in option list; "
2469 "please refer to the release notes for the combinations "
2470 "allowed\n");
2471 return false;
2472 }
2473
2474 if (UseConcMarkSweepGC && !UseParNewGC) {
2475 jio_fprintf(defaultStream::error_stream(),
2476 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2477 return false;
2478 }
2479
2480 if (UseParNewGC && !UseConcMarkSweepGC) {
2481 jio_fprintf(defaultStream::error_stream(),
2482 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2483 return false;
2484 }
2485
2486 return true;
2487 }
2488
2489 // Check the consistency of vm_init_args
2490 bool Arguments::check_vm_args_consistency() {
2491 // Method for adding checks for flag consistency.
2492 // The intent is to warn the user of all possible conflicts,
2493 // before returning an error.
2494 // Note: Needs platform-dependent factoring.
2495 bool status = true;
2496
2497 if (TLABRefillWasteFraction == 0) {
2498 jio_fprintf(defaultStream::error_stream(),
2499 "TLABRefillWasteFraction should be a denominator, "
2500 "not " SIZE_FORMAT "\n",
2501 TLABRefillWasteFraction);
2502 status = false;
2503 }
2504
2505 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2506 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2507 }
2508
2509 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2510 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2511 }
2512
2513 if (GCTimeLimit == 100) {
2514 // Turn off gc-overhead-limit-exceeded checks
2515 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2516 }
2517
2518 status = status && check_gc_consistency();
2519
2520 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2521 // insists that we hold the requisite locks so that the iteration is
2522 // MT-safe. For the verification at start-up and shut-down, we don't
2523 // yet have a good way of acquiring and releasing these locks,
2524 // which are not visible at the CollectedHeap level. We want to
2525 // be able to acquire these locks and then do the iteration rather
2526 // than just disable the lock verification. This will be fixed under
2527 // bug 4788986.
2528 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2529 if (VerifyDuringStartup) {
2530 warning("Heap verification at start-up disabled "
2531 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2532 VerifyDuringStartup = false; // Disable verification at start-up
2533 }
2534
2535 if (VerifyBeforeExit) {
2536 warning("Heap verification at shutdown disabled "
2537 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2538 VerifyBeforeExit = false; // Disable verification at shutdown
2539 }
2540 }
2541
2542 if (PrintNMTStatistics) {
2543 #if INCLUDE_NMT
2544 if (MemTracker::tracking_level() == NMT_off) {
2545 #endif // INCLUDE_NMT
2546 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2547 PrintNMTStatistics = false;
2548 #if INCLUDE_NMT
2549 }
2550 #endif
2551 }
2552 #if INCLUDE_JVMCI
2553
2554 status = status && check_jvmci_args_consistency();
2555
2556 if (EnableJVMCI) {
2557 if (!ScavengeRootsInCode) {
2558 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2559 ScavengeRootsInCode = 1;
2560 }
2561 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2562 TypeProfileLevel = 0;
2563 }
2564 if (UseJVMCICompiler) {
2565 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2566 TypeProfileWidth = 8;
2567 }
2568 }
2569 }
2570 #endif
2571
2572 // Check lower bounds of the code cache
2573 // Template Interpreter code is approximately 3X larger in debug builds.
2574 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2575 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2576 jio_fprintf(defaultStream::error_stream(),
2577 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2578 os::vm_page_size()/K);
2579 status = false;
2580 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2581 jio_fprintf(defaultStream::error_stream(),
2582 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2583 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2584 status = false;
2585 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2586 jio_fprintf(defaultStream::error_stream(),
2587 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2588 min_code_cache_size/K);
2589 status = false;
2590 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2591 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2592 jio_fprintf(defaultStream::error_stream(),
2593 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2594 CODE_CACHE_SIZE_LIMIT/M);
2595 status = false;
2596 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2597 jio_fprintf(defaultStream::error_stream(),
2598 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2599 min_code_cache_size/K);
2600 status = false;
2601 }
2602
2603 #ifdef _LP64
2604 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2605 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2606 }
2607 #endif
2608
2609 #ifndef SUPPORT_RESERVED_STACK_AREA
2610 if (StackReservedPages != 0) {
2611 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2612 warning("Reserved Stack Area not supported on this platform");
2613 }
2614 #endif
2615
2616 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2617 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2618 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2619 }
2620 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2621 }
2622 return status;
2623 }
2624
2625 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2626 const char* option_type) {
2627 if (ignore) return false;
2628
2629 const char* spacer = " ";
2630 if (option_type == NULL) {
2631 option_type = ++spacer; // Set both to the empty string.
2632 }
2633
2634 if (os::obsolete_option(option)) {
2635 jio_fprintf(defaultStream::error_stream(),
2636 "Obsolete %s%soption: %s\n", option_type, spacer,
2637 option->optionString);
2638 return false;
2639 } else {
2640 jio_fprintf(defaultStream::error_stream(),
2641 "Unrecognized %s%soption: %s\n", option_type, spacer,
2642 option->optionString);
2643 return true;
2644 }
2645 }
2646
2647 static const char* user_assertion_options[] = {
2648 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2649 };
2650
2651 static const char* system_assertion_options[] = {
2652 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2653 };
2654
2655 bool Arguments::parse_uintx(const char* value,
2656 uintx* uintx_arg,
2657 uintx min_size) {
2658
2659 // Check the sign first since atojulong() parses only unsigned values.
2660 bool value_is_positive = !(*value == '-');
2661
2662 if (value_is_positive) {
2663 julong n;
2664 bool good_return = atojulong(value, &n);
2665 if (good_return) {
2666 bool above_minimum = n >= min_size;
2667 bool value_is_too_large = n > max_uintx;
2668
2669 if (above_minimum && !value_is_too_large) {
2670 *uintx_arg = n;
2671 return true;
2672 }
2673 }
2674 }
2675 return false;
2676 }
2677
2678 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2679 julong* long_arg,
2680 julong min_size) {
2681 if (!atojulong(s, long_arg)) return arg_unreadable;
2682 return check_memory_size(*long_arg, min_size);
2683 }
2684
2685 // Parse JavaVMInitArgs structure
2686
2687 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2688 const JavaVMInitArgs *java_options_args,
2689 const JavaVMInitArgs *cmd_line_args) {
2690 // For components of the system classpath.
2691 ArgumentBootClassPath bcp(Arguments::get_sysclasspath());
2692 bool bcp_assembly_required = false;
2693
2694 // Save default settings for some mode flags
2695 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2696 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2697 Arguments::_ClipInlining = ClipInlining;
2698 Arguments::_BackgroundCompilation = BackgroundCompilation;
2699 if (TieredCompilation) {
2700 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2701 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2702 }
2703
2704 // Setup flags for mixed which is the default
2705 set_mode_flags(_mixed);
2706
2707 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2708 // variable (if present).
2709 jint result = parse_each_vm_init_arg(
2710 java_tool_options_args, &bcp, &bcp_assembly_required, Flag::ENVIRON_VAR);
2711 if (result != JNI_OK) {
2712 return result;
2713 }
2714
2715 // Parse args structure generated from the command line flags.
2716 result = parse_each_vm_init_arg(cmd_line_args, &bcp, &bcp_assembly_required,
2717 Flag::COMMAND_LINE);
2718 if (result != JNI_OK) {
2719 return result;
2720 }
2721
2722 // Parse args structure generated from the _JAVA_OPTIONS environment
2723 // variable (if present) (mimics classic VM)
2724 result = parse_each_vm_init_arg(
2725 java_options_args, &bcp, &bcp_assembly_required, Flag::ENVIRON_VAR);
2726 if (result != JNI_OK) {
2727 return result;
2728 }
2729
2730 // Do final processing now that all arguments have been parsed
2731 result = finalize_vm_init_args(&bcp, bcp_assembly_required);
2732 if (result != JNI_OK) {
2733 return result;
2734 }
2735
2736 return JNI_OK;
2737 }
2738
2739 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2740 // represents a valid JDWP agent. is_path==true denotes that we
2741 // are dealing with -agentpath (case where name is a path), otherwise with
2742 // -agentlib
2743 bool valid_jdwp_agent(char *name, bool is_path) {
2744 char *_name;
2745 const char *_jdwp = "jdwp";
2746 size_t _len_jdwp, _len_prefix;
2747
2748 if (is_path) {
2749 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2750 return false;
2751 }
2752
2753 _name++; // skip past last path separator
2754 _len_prefix = strlen(JNI_LIB_PREFIX);
2755
2756 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2757 return false;
2758 }
2759
2760 _name += _len_prefix;
2761 _len_jdwp = strlen(_jdwp);
2762
2763 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2764 _name += _len_jdwp;
2765 }
2766 else {
2767 return false;
2768 }
2769
2770 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2771 return false;
2772 }
2773
2774 return true;
2775 }
2776
2777 if (strcmp(name, _jdwp) == 0) {
2778 return true;
2779 }
2780
2781 return false;
2782 }
2783
2784 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2785 ArgumentBootClassPath* bcp_p,
2786 bool* bcp_assembly_required_p,
2787 Flag::Flags origin) {
2788 // For match_option to return remaining or value part of option string
2789 const char* tail;
2790
2791 // iterate over arguments
2792 for (int index = 0; index < args->nOptions; index++) {
2793 bool is_absolute_path = false; // for -agentpath vs -agentlib
2794
2795 const JavaVMOption* option = args->options + index;
2796
2797 if (!match_option(option, "-Djava.class.path", &tail) &&
2798 !match_option(option, "-Dsun.java.command", &tail) &&
2799 !match_option(option, "-Dsun.java.launcher", &tail)) {
2800
2801 // add all jvm options to the jvm_args string. This string
2802 // is used later to set the java.vm.args PerfData string constant.
2803 // the -Djava.class.path and the -Dsun.java.command options are
2804 // omitted from jvm_args string as each have their own PerfData
2805 // string constant object.
2806 build_jvm_args(option->optionString);
2807 }
2808
2809 // -verbose:[class/gc/jni]
2810 if (match_option(option, "-verbose", &tail)) {
2811 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2812 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(classload));
2813 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(classunload));
2814 } else if (!strcmp(tail, ":gc")) {
2815 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2816 } else if (!strcmp(tail, ":jni")) {
2817 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2818 return JNI_EINVAL;
2819 }
2820 }
2821 // -da / -ea / -disableassertions / -enableassertions
2822 // These accept an optional class/package name separated by a colon, e.g.,
2823 // -da:java.lang.Thread.
2824 } else if (match_option(option, user_assertion_options, &tail, true)) {
2825 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2826 if (*tail == '\0') {
2827 JavaAssertions::setUserClassDefault(enable);
2828 } else {
2829 assert(*tail == ':', "bogus match by match_option()");
2830 JavaAssertions::addOption(tail + 1, enable);
2831 }
2832 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2833 } else if (match_option(option, system_assertion_options, &tail, false)) {
2834 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2835 JavaAssertions::setSystemClassDefault(enable);
2836 // -bootclasspath:
2837 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2838 jio_fprintf(defaultStream::output_stream(),
2839 "-Xbootclasspath is no longer a supported option.\n");
2840 return JNI_EINVAL;
2841 // -bootclasspath/a:
2842 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2843 bcp_p->add_suffix(tail);
2844 *bcp_assembly_required_p = true;
2845 // -bootclasspath/p:
2846 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2847 jio_fprintf(defaultStream::output_stream(),
2848 "-Xbootclasspath/p is no longer a supported option.\n");
2849 return JNI_EINVAL;
2850 // -Xrun
2851 } else if (match_option(option, "-Xrun", &tail)) {
2852 if (tail != NULL) {
2853 const char* pos = strchr(tail, ':');
2854 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2855 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2856 name[len] = '\0';
2857
2858 char *options = NULL;
2859 if(pos != NULL) {
2860 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2861 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2862 }
2863 #if !INCLUDE_JVMTI
2864 if (strcmp(name, "jdwp") == 0) {
2865 jio_fprintf(defaultStream::error_stream(),
2866 "Debugging agents are not supported in this VM\n");
2867 return JNI_ERR;
2868 }
2869 #endif // !INCLUDE_JVMTI
2870 add_init_library(name, options);
2871 }
2872 // -agentlib and -agentpath
2873 } else if (match_option(option, "-agentlib:", &tail) ||
2874 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2875 if(tail != NULL) {
2876 const char* pos = strchr(tail, '=');
2877 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2878 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2879 name[len] = '\0';
2880
2881 char *options = NULL;
2882 if(pos != NULL) {
2883 options = os::strdup_check_oom(pos + 1, mtArguments);
2884 }
2885 #if !INCLUDE_JVMTI
2886 if (valid_jdwp_agent(name, is_absolute_path)) {
2887 jio_fprintf(defaultStream::error_stream(),
2888 "Debugging agents are not supported in this VM\n");
2889 return JNI_ERR;
2890 }
2891 #endif // !INCLUDE_JVMTI
2892 add_init_agent(name, options, is_absolute_path);
2893 }
2894 // -javaagent
2895 } else if (match_option(option, "-javaagent:", &tail)) {
2896 #if !INCLUDE_JVMTI
2897 jio_fprintf(defaultStream::error_stream(),
2898 "Instrumentation agents are not supported in this VM\n");
2899 return JNI_ERR;
2900 #else
2901 if (tail != NULL) {
2902 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtArguments), tail);
2903 add_init_agent("instrument", options, false);
2904 // java agents need module java.instrument. Also -addmods ALL-SYSTEM because
2905 // the java agent is in the unmamed module of the application class loader
2906 if (!Arguments::append_to_addmods_property("java.instrument,ALL-SYSTEM")) {
2907 return JNI_ENOMEM;
2908 }
2909 }
2910 #endif // !INCLUDE_JVMTI
2911 // -Xnoclassgc
2912 } else if (match_option(option, "-Xnoclassgc")) {
2913 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2914 return JNI_EINVAL;
2915 }
2916 // -Xconcgc
2917 } else if (match_option(option, "-Xconcgc")) {
2918 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2919 return JNI_EINVAL;
2920 }
2921 // -Xnoconcgc
2922 } else if (match_option(option, "-Xnoconcgc")) {
2923 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2924 return JNI_EINVAL;
2925 }
2926 // -Xbatch
2927 } else if (match_option(option, "-Xbatch")) {
2928 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2929 return JNI_EINVAL;
2930 }
2931 // -Xmn for compatibility with other JVM vendors
2932 } else if (match_option(option, "-Xmn", &tail)) {
2933 julong long_initial_young_size = 0;
2934 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2935 if (errcode != arg_in_range) {
2936 jio_fprintf(defaultStream::error_stream(),
2937 "Invalid initial young generation size: %s\n", option->optionString);
2938 describe_range_error(errcode);
2939 return JNI_EINVAL;
2940 }
2941 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2942 return JNI_EINVAL;
2943 }
2944 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2945 return JNI_EINVAL;
2946 }
2947 // -Xms
2948 } else if (match_option(option, "-Xms", &tail)) {
2949 julong long_initial_heap_size = 0;
2950 // an initial heap size of 0 means automatically determine
2951 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2952 if (errcode != arg_in_range) {
2953 jio_fprintf(defaultStream::error_stream(),
2954 "Invalid initial heap size: %s\n", option->optionString);
2955 describe_range_error(errcode);
2956 return JNI_EINVAL;
2957 }
2958 set_min_heap_size((size_t)long_initial_heap_size);
2959 // Currently the minimum size and the initial heap sizes are the same.
2960 // Can be overridden with -XX:InitialHeapSize.
2961 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2962 return JNI_EINVAL;
2963 }
2964 // -Xmx
2965 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2966 julong long_max_heap_size = 0;
2967 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2968 if (errcode != arg_in_range) {
2969 jio_fprintf(defaultStream::error_stream(),
2970 "Invalid maximum heap size: %s\n", option->optionString);
2971 describe_range_error(errcode);
2972 return JNI_EINVAL;
2973 }
2974 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2975 return JNI_EINVAL;
2976 }
2977 // Xmaxf
2978 } else if (match_option(option, "-Xmaxf", &tail)) {
2979 char* err;
2980 int maxf = (int)(strtod(tail, &err) * 100);
2981 if (*err != '\0' || *tail == '\0') {
2982 jio_fprintf(defaultStream::error_stream(),
2983 "Bad max heap free percentage size: %s\n",
2984 option->optionString);
2985 return JNI_EINVAL;
2986 } else {
2987 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2988 return JNI_EINVAL;
2989 }
2990 }
2991 // Xminf
2992 } else if (match_option(option, "-Xminf", &tail)) {
2993 char* err;
2994 int minf = (int)(strtod(tail, &err) * 100);
2995 if (*err != '\0' || *tail == '\0') {
2996 jio_fprintf(defaultStream::error_stream(),
2997 "Bad min heap free percentage size: %s\n",
2998 option->optionString);
2999 return JNI_EINVAL;
3000 } else {
3001 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
3002 return JNI_EINVAL;
3003 }
3004 }
3005 // -Xss
3006 } else if (match_option(option, "-Xss", &tail)) {
3007 julong long_ThreadStackSize = 0;
3008 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
3009 if (errcode != arg_in_range) {
3010 jio_fprintf(defaultStream::error_stream(),
3011 "Invalid thread stack size: %s\n", option->optionString);
3012 describe_range_error(errcode);
3013 return JNI_EINVAL;
3014 }
3015 // Internally track ThreadStackSize in units of 1024 bytes.
3016 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
3017 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
3018 return JNI_EINVAL;
3019 }
3020 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
3021 } else if (match_option(option, "-Xoss", &tail) ||
3022 match_option(option, "-Xsqnopause") ||
3023 match_option(option, "-Xoptimize") ||
3024 match_option(option, "-Xboundthreads") ||
3025 match_option(option, "-Xusealtsigs")) {
3026 // All these options are deprecated in JDK 9 and will be removed in a future release
3027 char version[256];
3028 JDK_Version::jdk(9).to_string(version, sizeof(version));
3029 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
3030 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3031 julong long_CodeCacheExpansionSize = 0;
3032 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3033 if (errcode != arg_in_range) {
3034 jio_fprintf(defaultStream::error_stream(),
3035 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3036 os::vm_page_size()/K);
3037 return JNI_EINVAL;
3038 }
3039 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
3040 return JNI_EINVAL;
3041 }
3042 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3043 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3044 julong long_ReservedCodeCacheSize = 0;
3045
3046 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3047 if (errcode != arg_in_range) {
3048 jio_fprintf(defaultStream::error_stream(),
3049 "Invalid maximum code cache size: %s.\n", option->optionString);
3050 return JNI_EINVAL;
3051 }
3052 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
3053 return JNI_EINVAL;
3054 }
3055 // -XX:NonNMethodCodeHeapSize=
3056 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
3057 julong long_NonNMethodCodeHeapSize = 0;
3058
3059 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
3060 if (errcode != arg_in_range) {
3061 jio_fprintf(defaultStream::error_stream(),
3062 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3063 return JNI_EINVAL;
3064 }
3065 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
3066 return JNI_EINVAL;
3067 }
3068 // -XX:ProfiledCodeHeapSize=
3069 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3070 julong long_ProfiledCodeHeapSize = 0;
3071
3072 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3073 if (errcode != arg_in_range) {
3074 jio_fprintf(defaultStream::error_stream(),
3075 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3076 return JNI_EINVAL;
3077 }
3078 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
3079 return JNI_EINVAL;
3080 }
3081 // -XX:NonProfiledCodeHeapSizee=
3082 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3083 julong long_NonProfiledCodeHeapSize = 0;
3084
3085 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3086 if (errcode != arg_in_range) {
3087 jio_fprintf(defaultStream::error_stream(),
3088 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3089 return JNI_EINVAL;
3090 }
3091 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
3092 return JNI_EINVAL;
3093 }
3094 // -green
3095 } else if (match_option(option, "-green")) {
3096 jio_fprintf(defaultStream::error_stream(),
3097 "Green threads support not available\n");
3098 return JNI_EINVAL;
3099 // -native
3100 } else if (match_option(option, "-native")) {
3101 // HotSpot always uses native threads, ignore silently for compatibility
3102 // -Xrs
3103 } else if (match_option(option, "-Xrs")) {
3104 // Classic/EVM option, new functionality
3105 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3106 return JNI_EINVAL;
3107 }
3108 // -Xprof
3109 } else if (match_option(option, "-Xprof")) {
3110 #if INCLUDE_FPROF
3111 _has_profile = true;
3112 #else // INCLUDE_FPROF
3113 jio_fprintf(defaultStream::error_stream(),
3114 "Flat profiling is not supported in this VM.\n");
3115 return JNI_ERR;
3116 #endif // INCLUDE_FPROF
3117 // -Xconcurrentio
3118 } else if (match_option(option, "-Xconcurrentio")) {
3119 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3120 return JNI_EINVAL;
3121 }
3122 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3123 return JNI_EINVAL;
3124 }
3125 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3126 return JNI_EINVAL;
3127 }
3128 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3129 return JNI_EINVAL;
3130 }
3131 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
3132 return JNI_EINVAL;
3133 }
3134
3135 // -Xinternalversion
3136 } else if (match_option(option, "-Xinternalversion")) {
3137 jio_fprintf(defaultStream::output_stream(), "%s\n",
3138 VM_Version::internal_vm_info_string());
3139 vm_exit(0);
3140 #ifndef PRODUCT
3141 // -Xprintflags
3142 } else if (match_option(option, "-Xprintflags")) {
3143 CommandLineFlags::printFlags(tty, false);
3144 vm_exit(0);
3145 #endif
3146 // -D
3147 } else if (match_option(option, "-D", &tail)) {
3148 const char* value;
3149 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3150 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3151 // abort if -Djava.endorsed.dirs is set
3152 jio_fprintf(defaultStream::output_stream(),
3153 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3154 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3155 return JNI_EINVAL;
3156 }
3157 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3158 *value != '\0' && strcmp(value, "\"\"") != 0) {
3159 // abort if -Djava.ext.dirs is set
3160 jio_fprintf(defaultStream::output_stream(),
3161 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3162 return JNI_EINVAL;
3163 }
3164
3165 if (!add_property(tail)) {
3166 return JNI_ENOMEM;
3167 }
3168 // Out of the box management support
3169 if (match_option(option, "-Dcom.sun.management", &tail)) {
3170 #if INCLUDE_MANAGEMENT
3171 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3172 return JNI_EINVAL;
3173 }
3174 // management agent in module java.management
3175 if (!Arguments::append_to_addmods_property("java.management")) {
3176 return JNI_ENOMEM;
3177 }
3178 #else
3179 jio_fprintf(defaultStream::output_stream(),
3180 "-Dcom.sun.management is not supported in this VM.\n");
3181 return JNI_ERR;
3182 #endif
3183 }
3184 if (match_option(option, "-Djdk.launcher.patch.0=", &tail)) {
3185 // -Xpatch
3186 int dir_count;
3187 char** patch_dirs = os::split_path(tail, &dir_count);
3188 if (patch_dirs == NULL) {
3189 jio_fprintf(defaultStream::output_stream(),
3190 "Bad value for -Xpatch.\n");
3191 return JNI_ERR;
3192 }
3193 set_patch_dirs(patch_dirs);
3194 set_patch_dirs_count(dir_count);
3195
3196 // Create a path for each patch dir consisting of dir/java.base.
3197 char file_sep = os::file_separator()[0];
3198 for (int x = 0; x < dir_count; x++) {
3199 // Really shouldn't be NULL, but check can't hurt
3200 if (patch_dirs[x] != NULL) {
3201 size_t len = strlen(patch_dirs[x]);
3202 if (len != 0) { // Ignore empty strings.
3203 len += 11; // file_sep + "java.base" + null terminator.
3204 char* dir = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3205 jio_snprintf(dir, len, "%s%cjava.base", patch_dirs[x], file_sep);
3206
3207 // See if Xpatch module path exists.
3208 struct stat st;
3209 if ((os::stat(dir, &st) == 0)) {
3210 bcp_p->add_prefix(dir);
3211 *bcp_assembly_required_p = true;
3212 }
3213 FREE_C_HEAP_ARRAY(char, dir);
3214 }
3215 }
3216 }
3217 }
3218 // -Xint
3219 } else if (match_option(option, "-Xint")) {
3220 set_mode_flags(_int);
3221 // -Xmixed
3222 } else if (match_option(option, "-Xmixed")) {
3223 set_mode_flags(_mixed);
3224 // -Xcomp
3225 } else if (match_option(option, "-Xcomp")) {
3226 // for testing the compiler; turn off all flags that inhibit compilation
3227 set_mode_flags(_comp);
3228 // -Xshare:dump
3229 } else if (match_option(option, "-Xshare:dump")) {
3230 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3231 return JNI_EINVAL;
3232 }
3233 set_mode_flags(_int); // Prevent compilation, which creates objects
3234 // -Xshare:on
3235 } else if (match_option(option, "-Xshare:on")) {
3236 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3237 return JNI_EINVAL;
3238 }
3239 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3240 return JNI_EINVAL;
3241 }
3242 // -Xshare:auto
3243 } else if (match_option(option, "-Xshare:auto")) {
3244 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3245 return JNI_EINVAL;
3246 }
3247 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3248 return JNI_EINVAL;
3249 }
3250 // -Xshare:off
3251 } else if (match_option(option, "-Xshare:off")) {
3252 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3253 return JNI_EINVAL;
3254 }
3255 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3256 return JNI_EINVAL;
3257 }
3258 // -Xverify
3259 } else if (match_option(option, "-Xverify", &tail)) {
3260 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3261 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3262 return JNI_EINVAL;
3263 }
3264 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3265 return JNI_EINVAL;
3266 }
3267 } else if (strcmp(tail, ":remote") == 0) {
3268 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3269 return JNI_EINVAL;
3270 }
3271 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3272 return JNI_EINVAL;
3273 }
3274 } else if (strcmp(tail, ":none") == 0) {
3275 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3276 return JNI_EINVAL;
3277 }
3278 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3279 return JNI_EINVAL;
3280 }
3281 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3282 return JNI_EINVAL;
3283 }
3284 // -Xdebug
3285 } else if (match_option(option, "-Xdebug")) {
3286 // note this flag has been used, then ignore
3287 set_xdebug_mode(true);
3288 // -Xnoagent
3289 } else if (match_option(option, "-Xnoagent")) {
3290 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3291 } else if (match_option(option, "-Xloggc:", &tail)) {
3292 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3293 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3294 _gc_log_filename = os::strdup_check_oom(tail);
3295 } else if (match_option(option, "-Xlog", &tail)) {
3296 bool ret = false;
3297 if (strcmp(tail, ":help") == 0) {
3298 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3299 vm_exit(0);
3300 } else if (strcmp(tail, ":disable") == 0) {
3301 LogConfiguration::disable_logging();
3302 ret = true;
3303 } else if (*tail == '\0') {
3304 ret = LogConfiguration::parse_command_line_arguments();
3305 assert(ret, "-Xlog without arguments should never fail to parse");
3306 } else if (*tail == ':') {
3307 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3308 }
3309 if (ret == false) {
3310 jio_fprintf(defaultStream::error_stream(),
3311 "Invalid -Xlog option '-Xlog%s'\n",
3312 tail);
3313 return JNI_EINVAL;
3314 }
3315 // JNI hooks
3316 } else if (match_option(option, "-Xcheck", &tail)) {
3317 if (!strcmp(tail, ":jni")) {
3318 #if !INCLUDE_JNI_CHECK
3319 warning("JNI CHECKING is not supported in this VM");
3320 #else
3321 CheckJNICalls = true;
3322 #endif // INCLUDE_JNI_CHECK
3323 } else if (is_bad_option(option, args->ignoreUnrecognized,
3324 "check")) {
3325 return JNI_EINVAL;
3326 }
3327 } else if (match_option(option, "vfprintf")) {
3328 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3329 } else if (match_option(option, "exit")) {
3330 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3331 } else if (match_option(option, "abort")) {
3332 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3333 // -XX:+AggressiveHeap
3334 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3335 jint result = set_aggressive_heap_flags();
3336 if (result != JNI_OK) {
3337 return result;
3338 }
3339 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3340 // and the last option wins.
3341 } else if (match_option(option, "-XX:+NeverTenure")) {
3342 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3343 return JNI_EINVAL;
3344 }
3345 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3346 return JNI_EINVAL;
3347 }
3348 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3349 return JNI_EINVAL;
3350 }
3351 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3352 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3353 return JNI_EINVAL;
3354 }
3355 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3356 return JNI_EINVAL;
3357 }
3358 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3359 return JNI_EINVAL;
3360 }
3361 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3362 uintx max_tenuring_thresh = 0;
3363 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3364 jio_fprintf(defaultStream::error_stream(),
3365 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3366 return JNI_EINVAL;
3367 }
3368
3369 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3370 return JNI_EINVAL;
3371 }
3372
3373 if (MaxTenuringThreshold == 0) {
3374 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3375 return JNI_EINVAL;
3376 }
3377 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3378 return JNI_EINVAL;
3379 }
3380 } else {
3381 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3382 return JNI_EINVAL;
3383 }
3384 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3385 return JNI_EINVAL;
3386 }
3387 }
3388 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3389 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3390 return JNI_EINVAL;
3391 }
3392 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3393 return JNI_EINVAL;
3394 }
3395 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3396 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3397 return JNI_EINVAL;
3398 }
3399 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3400 return JNI_EINVAL;
3401 }
3402 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3403 #if defined(DTRACE_ENABLED)
3404 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3405 return JNI_EINVAL;
3406 }
3407 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3408 return JNI_EINVAL;
3409 }
3410 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3411 return JNI_EINVAL;
3412 }
3413 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3414 return JNI_EINVAL;
3415 }
3416 #else // defined(DTRACE_ENABLED)
3417 jio_fprintf(defaultStream::error_stream(),
3418 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3419 return JNI_EINVAL;
3420 #endif // defined(DTRACE_ENABLED)
3421 #ifdef ASSERT
3422 } else if (match_option(option, "-XX:+FullGCALot")) {
3423 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3424 return JNI_EINVAL;
3425 }
3426 // disable scavenge before parallel mark-compact
3427 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3428 return JNI_EINVAL;
3429 }
3430 #endif
3431 #if !INCLUDE_MANAGEMENT
3432 } else if (match_option(option, "-XX:+ManagementServer")) {
3433 jio_fprintf(defaultStream::error_stream(),
3434 "ManagementServer is not supported in this VM.\n");
3435 return JNI_ERR;
3436 #endif // INCLUDE_MANAGEMENT
3437 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3438 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3439 // already been handled
3440 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3441 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3442 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3443 return JNI_EINVAL;
3444 }
3445 }
3446 // Unknown option
3447 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3448 return JNI_ERR;
3449 }
3450 }
3451
3452 // PrintSharedArchiveAndExit will turn on
3453 // -Xshare:on
3454 // -Xlog:classpath=info
3455 if (PrintSharedArchiveAndExit) {
3456 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3457 return JNI_EINVAL;
3458 }
3459 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3460 return JNI_EINVAL;
3461 }
3462 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(classpath));
3463 }
3464
3465 // Change the default value for flags which have different default values
3466 // when working with older JDKs.
3467 #ifdef LINUX
3468 if (JDK_Version::current().compare_major(6) <= 0 &&
3469 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3470 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3471 }
3472 #endif // LINUX
3473 fix_appclasspath();
3474 return JNI_OK;
3475 }
3476
3477 // Set property jdk.boot.class.path.append to the contents of the bootclasspath
3478 // that follows either the jimage file or exploded module directories. The
3479 // property will contain -Xbootclasspath/a and/or jvmti appended additions.
3480 void Arguments::set_jdkbootclasspath_append() {
3481 char *sysclasspath = get_sysclasspath();
3482 assert(sysclasspath != NULL, "NULL sysclasspath");
3483 int bcp_a_idx = bootclassloader_append_index();
3484 if (bcp_a_idx != -1 && bcp_a_idx < (int)strlen(sysclasspath)) {
3485 _jdk_boot_class_path_append->set_value(sysclasspath + bcp_a_idx);
3486 }
3487 }
3488
3489 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3490 //
3491 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3492 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3493 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3494 // path is treated as the current directory.
3495 //
3496 // This causes problems with CDS, which requires that all directories specified in the classpath
3497 // must be empty. In most cases, applications do NOT want to load classes from the current
3498 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3499 // scripts compatible with CDS.
3500 void Arguments::fix_appclasspath() {
3501 if (IgnoreEmptyClassPaths) {
3502 const char separator = *os::path_separator();
3503 const char* src = _java_class_path->value();
3504
3505 // skip over all the leading empty paths
3506 while (*src == separator) {
3507 src ++;
3508 }
3509
3510 char* copy = os::strdup_check_oom(src, mtArguments);
3511
3512 // trim all trailing empty paths
3513 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3514 *tail = '\0';
3515 }
3516
3517 char from[3] = {separator, separator, '\0'};
3518 char to [2] = {separator, '\0'};
3519 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3520 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3521 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3522 }
3523
3524 _java_class_path->set_writeable_value(copy);
3525 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3526 }
3527 }
3528
3529 static bool has_jar_files(const char* directory) {
3530 DIR* dir = os::opendir(directory);
3531 if (dir == NULL) return false;
3532
3533 struct dirent *entry;
3534 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3535 bool hasJarFile = false;
3536 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3537 const char* name = entry->d_name;
3538 const char* ext = name + strlen(name) - 4;
3539 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3540 }
3541 FREE_C_HEAP_ARRAY(char, dbuf);
3542 os::closedir(dir);
3543 return hasJarFile ;
3544 }
3545
3546 static int check_non_empty_dirs(const char* path) {
3547 const char separator = *os::path_separator();
3548 const char* const end = path + strlen(path);
3549 int nonEmptyDirs = 0;
3550 while (path < end) {
3551 const char* tmp_end = strchr(path, separator);
3552 if (tmp_end == NULL) {
3553 if (has_jar_files(path)) {
3554 nonEmptyDirs++;
3555 jio_fprintf(defaultStream::output_stream(),
3556 "Non-empty directory: %s\n", path);
3557 }
3558 path = end;
3559 } else {
3560 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3561 memcpy(dirpath, path, tmp_end - path);
3562 dirpath[tmp_end - path] = '\0';
3563 if (has_jar_files(dirpath)) {
3564 nonEmptyDirs++;
3565 jio_fprintf(defaultStream::output_stream(),
3566 "Non-empty directory: %s\n", dirpath);
3567 }
3568 FREE_C_HEAP_ARRAY(char, dirpath);
3569 path = tmp_end + 1;
3570 }
3571 }
3572 return nonEmptyDirs;
3573 }
3574
3575 jint Arguments::finalize_vm_init_args(ArgumentBootClassPath* bcp_p, bool bcp_assembly_required) {
3576 // check if the default lib/endorsed directory exists; if so, error
3577 char path[JVM_MAXPATHLEN];
3578 const char* fileSep = os::file_separator();
3579 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3580
3581 if (CheckEndorsedAndExtDirs) {
3582 int nonEmptyDirs = 0;
3583 // check endorsed directory
3584 nonEmptyDirs += check_non_empty_dirs(path);
3585 // check the extension directories
3586 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3587 if (nonEmptyDirs > 0) {
3588 return JNI_ERR;
3589 }
3590 }
3591
3592 DIR* dir = os::opendir(path);
3593 if (dir != NULL) {
3594 jio_fprintf(defaultStream::output_stream(),
3595 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3596 "in modular form will be supported via the concept of upgradeable modules.\n");
3597 os::closedir(dir);
3598 return JNI_ERR;
3599 }
3600
3601 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3602 dir = os::opendir(path);
3603 if (dir != NULL) {
3604 jio_fprintf(defaultStream::output_stream(),
3605 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3606 "Use -classpath instead.\n.");
3607 os::closedir(dir);
3608 return JNI_ERR;
3609 }
3610
3611 if (bcp_assembly_required) {
3612 // Assemble the bootclasspath elements into the final path.
3613 char *combined_path = bcp_p->combined_path();
3614 Arguments::set_sysclasspath(combined_path);
3615 FREE_C_HEAP_ARRAY(char, combined_path);
3616 } else {
3617 // At this point in sysclasspath processing anything
3618 // added would be considered in the boot loader's append path.
3619 // Record this index, including +1 for the file separator character.
3620 Arguments::set_bootclassloader_append_index(((int)strlen(Arguments::get_sysclasspath()))+1);
3621 }
3622
3623 // This must be done after all arguments have been processed.
3624 // java_compiler() true means set to "NONE" or empty.
3625 if (java_compiler() && !xdebug_mode()) {
3626 // For backwards compatibility, we switch to interpreted mode if
3627 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3628 // not specified.
3629 set_mode_flags(_int);
3630 }
3631
3632 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3633 // but like -Xint, leave compilation thresholds unaffected.
3634 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3635 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3636 set_mode_flags(_int);
3637 }
3638
3639 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3640 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3641 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3642 }
3643
3644 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3645 // Don't degrade server performance for footprint
3646 if (FLAG_IS_DEFAULT(UseLargePages) &&
3647 MaxHeapSize < LargePageHeapSizeThreshold) {
3648 // No need for large granularity pages w/small heaps.
3649 // Note that large pages are enabled/disabled for both the
3650 // Java heap and the code cache.
3651 FLAG_SET_DEFAULT(UseLargePages, false);
3652 }
3653
3654 #elif defined(COMPILER2)
3655 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3656 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3657 }
3658 #endif
3659
3660 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3661 UNSUPPORTED_OPTION(ProfileInterpreter);
3662 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3663 #endif
3664
3665 #ifndef TIERED
3666 // Tiered compilation is undefined.
3667 UNSUPPORTED_OPTION(TieredCompilation);
3668 #endif
3669
3670 // If we are running in a headless jre, force java.awt.headless property
3671 // to be true unless the property has already been set.
3672 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3673 if (os::is_headless_jre()) {
3674 const char* headless = Arguments::get_property("java.awt.headless");
3675 if (headless == NULL) {
3676 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3677 if (headless_env == NULL) {
3678 if (!add_property("java.awt.headless=true")) {
3679 return JNI_ENOMEM;
3680 }
3681 } else {
3682 char buffer[256];
3683 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3684 if (!add_property(buffer)) {
3685 return JNI_ENOMEM;
3686 }
3687 }
3688 }
3689 }
3690
3691 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3692 // CMS can only be used with ParNew
3693 FLAG_SET_ERGO(bool, UseParNewGC, true);
3694 }
3695
3696 if (!check_vm_args_consistency()) {
3697 return JNI_ERR;
3698 }
3699
3700 return JNI_OK;
3701 }
3702
3703 // Helper class for controlling the lifetime of JavaVMInitArgs
3704 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3705 // deleted on the destruction of the ScopedVMInitArgs object.
3706 class ScopedVMInitArgs : public StackObj {
3707 private:
3708 JavaVMInitArgs _args;
3709 char* _container_name;
3710 bool _is_set;
3711 char* _vm_options_file_arg;
3712
3713 public:
3714 ScopedVMInitArgs(const char *container_name) {
3715 _args.version = JNI_VERSION_1_2;
3716 _args.nOptions = 0;
3717 _args.options = NULL;
3718 _args.ignoreUnrecognized = false;
3719 _container_name = (char *)container_name;
3720 _is_set = false;
3721 _vm_options_file_arg = NULL;
3722 }
3723
3724 // Populates the JavaVMInitArgs object represented by this
3725 // ScopedVMInitArgs object with the arguments in options. The
3726 // allocated memory is deleted by the destructor. If this method
3727 // returns anything other than JNI_OK, then this object is in a
3728 // partially constructed state, and should be abandoned.
3729 jint set_args(GrowableArray<JavaVMOption>* options) {
3730 _is_set = true;
3731 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3732 JavaVMOption, options->length(), mtArguments);
3733 if (options_arr == NULL) {
3734 return JNI_ENOMEM;
3735 }
3736 _args.options = options_arr;
3737
3738 for (int i = 0; i < options->length(); i++) {
3739 options_arr[i] = options->at(i);
3740 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3741 if (options_arr[i].optionString == NULL) {
3742 // Rely on the destructor to do cleanup.
3743 _args.nOptions = i;
3744 return JNI_ENOMEM;
3745 }
3746 }
3747
3748 _args.nOptions = options->length();
3749 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3750 return JNI_OK;
3751 }
3752
3753 JavaVMInitArgs* get() { return &_args; }
3754 char* container_name() { return _container_name; }
3755 bool is_set() { return _is_set; }
3756 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3757 char* vm_options_file_arg() { return _vm_options_file_arg; }
3758
3759 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3760 if (_vm_options_file_arg != NULL) {
3761 os::free(_vm_options_file_arg);
3762 }
3763 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3764 }
3765
3766 ~ScopedVMInitArgs() {
3767 if (_vm_options_file_arg != NULL) {
3768 os::free(_vm_options_file_arg);
3769 }
3770 if (_args.options == NULL) return;
3771 for (int i = 0; i < _args.nOptions; i++) {
3772 os::free(_args.options[i].optionString);
3773 }
3774 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3775 }
3776
3777 // Insert options into this option list, to replace option at
3778 // vm_options_file_pos (-XX:VMOptionsFile)
3779 jint insert(const JavaVMInitArgs* args,
3780 const JavaVMInitArgs* args_to_insert,
3781 const int vm_options_file_pos) {
3782 assert(_args.options == NULL, "shouldn't be set yet");
3783 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3784 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3785
3786 int length = args->nOptions + args_to_insert->nOptions - 1;
3787 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3788 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3789 for (int i = 0; i < args->nOptions; i++) {
3790 if (i == vm_options_file_pos) {
3791 // insert the new options starting at the same place as the
3792 // -XX:VMOptionsFile option
3793 for (int j = 0; j < args_to_insert->nOptions; j++) {
3794 options->push(args_to_insert->options[j]);
3795 }
3796 } else {
3797 options->push(args->options[i]);
3798 }
3799 }
3800 // make into options array
3801 jint result = set_args(options);
3802 delete options;
3803 return result;
3804 }
3805 };
3806
3807 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3808 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3809 }
3810
3811 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3812 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3813 }
3814
3815 jint Arguments::parse_options_environment_variable(const char* name,
3816 ScopedVMInitArgs* vm_args) {
3817 char *buffer = ::getenv(name);
3818
3819 // Don't check this environment variable if user has special privileges
3820 // (e.g. unix su command).
3821 if (buffer == NULL || os::have_special_privileges()) {
3822 return JNI_OK;
3823 }
3824
3825 if ((buffer = os::strdup(buffer)) == NULL) {
3826 return JNI_ENOMEM;
3827 }
3828
3829 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3830
3831 os::free(buffer);
3832 return retcode;
3833 }
3834
3835 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3836 // read file into buffer
3837 int fd = ::open(file_name, O_RDONLY);
3838 if (fd < 0) {
3839 jio_fprintf(defaultStream::error_stream(),
3840 "Could not open options file '%s'\n",
3841 file_name);
3842 return JNI_ERR;
3843 }
3844
3845 struct stat stbuf;
3846 int retcode = os::stat(file_name, &stbuf);
3847 if (retcode != 0) {
3848 jio_fprintf(defaultStream::error_stream(),
3849 "Could not stat options file '%s'\n",
3850 file_name);
3851 os::close(fd);
3852 return JNI_ERR;
3853 }
3854
3855 if (stbuf.st_size == 0) {
3856 // tell caller there is no option data and that is ok
3857 os::close(fd);
3858 return JNI_OK;
3859 }
3860
3861 // '+ 1' for NULL termination even with max bytes
3862 size_t bytes_alloc = stbuf.st_size + 1;
3863
3864 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3865 if (NULL == buf) {
3866 jio_fprintf(defaultStream::error_stream(),
3867 "Could not allocate read buffer for options file parse\n");
3868 os::close(fd);
3869 return JNI_ENOMEM;
3870 }
3871
3872 memset(buf, 0, bytes_alloc);
3873
3874 // Fill buffer
3875 // Use ::read() instead of os::read because os::read()
3876 // might do a thread state transition
3877 // and it is too early for that here
3878
3879 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3880 os::close(fd);
3881 if (bytes_read < 0) {
3882 FREE_C_HEAP_ARRAY(char, buf);
3883 jio_fprintf(defaultStream::error_stream(),
3884 "Could not read options file '%s'\n", file_name);
3885 return JNI_ERR;
3886 }
3887
3888 if (bytes_read == 0) {
3889 // tell caller there is no option data and that is ok
3890 FREE_C_HEAP_ARRAY(char, buf);
3891 return JNI_OK;
3892 }
3893
3894 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3895
3896 FREE_C_HEAP_ARRAY(char, buf);
3897 return retcode;
3898 }
3899
3900 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3901 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3902
3903 // some pointers to help with parsing
3904 char *buffer_end = buffer + buf_len;
3905 char *opt_hd = buffer;
3906 char *wrt = buffer;
3907 char *rd = buffer;
3908
3909 // parse all options
3910 while (rd < buffer_end) {
3911 // skip leading white space from the input string
3912 while (rd < buffer_end && isspace(*rd)) {
3913 rd++;
3914 }
3915
3916 if (rd >= buffer_end) {
3917 break;
3918 }
3919
3920 // Remember this is where we found the head of the token.
3921 opt_hd = wrt;
3922
3923 // Tokens are strings of non white space characters separated
3924 // by one or more white spaces.
3925 while (rd < buffer_end && !isspace(*rd)) {
3926 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3927 int quote = *rd; // matching quote to look for
3928 rd++; // don't copy open quote
3929 while (rd < buffer_end && *rd != quote) {
3930 // include everything (even spaces)
3931 // up until the close quote
3932 *wrt++ = *rd++; // copy to option string
3933 }
3934
3935 if (rd < buffer_end) {
3936 rd++; // don't copy close quote
3937 } else {
3938 // did not see closing quote
3939 jio_fprintf(defaultStream::error_stream(),
3940 "Unmatched quote in %s\n", name);
3941 delete options;
3942 return JNI_ERR;
3943 }
3944 } else {
3945 *wrt++ = *rd++; // copy to option string
3946 }
3947 }
3948
3949 // steal a white space character and set it to NULL
3950 *wrt++ = '\0';
3951 // We now have a complete token
3952
3953 JavaVMOption option;
3954 option.optionString = opt_hd;
3955 option.extraInfo = NULL;
3956
3957 options->append(option); // Fill in option
3958
3959 rd++; // Advance to next character
3960 }
3961
3962 // Fill out JavaVMInitArgs structure.
3963 jint status = vm_args->set_args(options);
3964
3965 delete options;
3966 return status;
3967 }
3968
3969 void Arguments::set_shared_spaces_flags() {
3970 if (DumpSharedSpaces) {
3971 if (Arguments::patch_dirs() != NULL) {
3972 vm_exit_during_initialization(
3973 "Cannot use the following option when dumping the shared archive", "-Xpatch");
3974 }
3975
3976 if (RequireSharedSpaces) {
3977 warning("Cannot dump shared archive while using shared archive");
3978 }
3979 UseSharedSpaces = false;
3980 #ifdef _LP64
3981 if (!UseCompressedOops || !UseCompressedClassPointers) {
3982 vm_exit_during_initialization(
3983 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3984 }
3985 } else {
3986 if (!UseCompressedOops || !UseCompressedClassPointers) {
3987 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3988 }
3989 #endif
3990 }
3991 }
3992
3993 // Sharing support
3994 // Construct the path to the archive
3995 static char* get_shared_archive_path() {
3996 char *shared_archive_path;
3997 if (SharedArchiveFile == NULL) {
3998 char jvm_path[JVM_MAXPATHLEN];
3999 os::jvm_path(jvm_path, sizeof(jvm_path));
4000 char *end = strrchr(jvm_path, *os::file_separator());
4001 if (end != NULL) *end = '\0';
4002 size_t jvm_path_len = strlen(jvm_path);
4003 size_t file_sep_len = strlen(os::file_separator());
4004 const size_t len = jvm_path_len + file_sep_len + 20;
4005 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
4006 if (shared_archive_path != NULL) {
4007 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
4008 jvm_path, os::file_separator());
4009 }
4010 } else {
4011 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
4012 }
4013 return shared_archive_path;
4014 }
4015
4016 #ifndef PRODUCT
4017 // Determine whether LogVMOutput should be implicitly turned on.
4018 static bool use_vm_log() {
4019 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
4020 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
4021 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
4022 PrintAssembly || TraceDeoptimization || TraceDependencies ||
4023 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
4024 return true;
4025 }
4026
4027 #ifdef COMPILER1
4028 if (PrintC1Statistics) {
4029 return true;
4030 }
4031 #endif // COMPILER1
4032
4033 #ifdef COMPILER2
4034 if (PrintOptoAssembly || PrintOptoStatistics) {
4035 return true;
4036 }
4037 #endif // COMPILER2
4038
4039 return false;
4040 }
4041
4042 #endif // PRODUCT
4043
4044 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
4045 for (int index = 0; index < args->nOptions; index++) {
4046 const JavaVMOption* option = args->options + index;
4047 const char* tail;
4048 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4049 return true;
4050 }
4051 }
4052 return false;
4053 }
4054
4055 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
4056 const char* vm_options_file,
4057 const int vm_options_file_pos,
4058 ScopedVMInitArgs* vm_options_file_args,
4059 ScopedVMInitArgs* args_out) {
4060 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
4061 if (code != JNI_OK) {
4062 return code;
4063 }
4064
4065 if (vm_options_file_args->get()->nOptions < 1) {
4066 return JNI_OK;
4067 }
4068
4069 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
4070 jio_fprintf(defaultStream::error_stream(),
4071 "A VM options file may not refer to a VM options file. "
4072 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
4073 "options file '%s' in options container '%s' is an error.\n",
4074 vm_options_file_args->vm_options_file_arg(),
4075 vm_options_file_args->container_name());
4076 return JNI_EINVAL;
4077 }
4078
4079 return args_out->insert(args, vm_options_file_args->get(),
4080 vm_options_file_pos);
4081 }
4082
4083 // Expand -XX:VMOptionsFile found in args_in as needed.
4084 // mod_args and args_out parameters may return values as needed.
4085 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
4086 ScopedVMInitArgs* mod_args,
4087 JavaVMInitArgs** args_out) {
4088 jint code = match_special_option_and_act(args_in, mod_args);
4089 if (code != JNI_OK) {
4090 return code;
4091 }
4092
4093 if (mod_args->is_set()) {
4094 // args_in contains -XX:VMOptionsFile and mod_args contains the
4095 // original options from args_in along with the options expanded
4096 // from the VMOptionsFile. Return a short-hand to the caller.
4097 *args_out = mod_args->get();
4098 } else {
4099 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
4100 }
4101 return JNI_OK;
4102 }
4103
4104 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
4105 ScopedVMInitArgs* args_out) {
4106 // Remaining part of option string
4107 const char* tail;
4108 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
4109
4110 for (int index = 0; index < args->nOptions; index++) {
4111 const JavaVMOption* option = args->options + index;
4112 if (ArgumentsExt::process_options(option)) {
4113 continue;
4114 }
4115 if (match_option(option, "-XX:Flags=", &tail)) {
4116 Arguments::set_jvm_flags_file(tail);
4117 continue;
4118 }
4119 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4120 if (vm_options_file_args.found_vm_options_file_arg()) {
4121 jio_fprintf(defaultStream::error_stream(),
4122 "The option '%s' is already specified in the options "
4123 "container '%s' so the specification of '%s' in the "
4124 "same options container is an error.\n",
4125 vm_options_file_args.vm_options_file_arg(),
4126 vm_options_file_args.container_name(),
4127 option->optionString);
4128 return JNI_EINVAL;
4129 }
4130 vm_options_file_args.set_vm_options_file_arg(option->optionString);
4131 // If there's a VMOptionsFile, parse that
4132 jint code = insert_vm_options_file(args, tail, index,
4133 &vm_options_file_args, args_out);
4134 if (code != JNI_OK) {
4135 return code;
4136 }
4137 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
4138 if (args_out->is_set()) {
4139 // The VMOptions file inserted some options so switch 'args'
4140 // to the new set of options, and continue processing which
4141 // preserves "last option wins" semantics.
4142 args = args_out->get();
4143 // The first option from the VMOptionsFile replaces the
4144 // current option. So we back track to process the
4145 // replacement option.
4146 index--;
4147 }
4148 continue;
4149 }
4150 if (match_option(option, "-XX:+PrintVMOptions")) {
4151 PrintVMOptions = true;
4152 continue;
4153 }
4154 if (match_option(option, "-XX:-PrintVMOptions")) {
4155 PrintVMOptions = false;
4156 continue;
4157 }
4158 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4159 IgnoreUnrecognizedVMOptions = true;
4160 continue;
4161 }
4162 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4163 IgnoreUnrecognizedVMOptions = false;
4164 continue;
4165 }
4166 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4167 CommandLineFlags::printFlags(tty, false);
4168 vm_exit(0);
4169 }
4170 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4171 #if INCLUDE_NMT
4172 // The launcher did not setup nmt environment variable properly.
4173 if (!MemTracker::check_launcher_nmt_support(tail)) {
4174 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4175 }
4176
4177 // Verify if nmt option is valid.
4178 if (MemTracker::verify_nmt_option()) {
4179 // Late initialization, still in single-threaded mode.
4180 if (MemTracker::tracking_level() >= NMT_summary) {
4181 MemTracker::init();
4182 }
4183 } else {
4184 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4185 }
4186 continue;
4187 #else
4188 jio_fprintf(defaultStream::error_stream(),
4189 "Native Memory Tracking is not supported in this VM\n");
4190 return JNI_ERR;
4191 #endif
4192 }
4193
4194 #ifndef PRODUCT
4195 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4196 CommandLineFlags::printFlags(tty, true);
4197 vm_exit(0);
4198 }
4199 #endif
4200 }
4201 return JNI_OK;
4202 }
4203
4204 static void print_options(const JavaVMInitArgs *args) {
4205 const char* tail;
4206 for (int index = 0; index < args->nOptions; index++) {
4207 const JavaVMOption *option = args->options + index;
4208 if (match_option(option, "-XX:", &tail)) {
4209 logOption(tail);
4210 }
4211 }
4212 }
4213
4214 bool Arguments::handle_deprecated_print_gc_flags() {
4215 if (PrintGC) {
4216 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4217 }
4218 if (PrintGCDetails) {
4219 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4220 }
4221
4222 if (_gc_log_filename != NULL) {
4223 // -Xloggc was used to specify a filename
4224 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4225 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, NULL);
4226 } else if (PrintGC || PrintGCDetails) {
4227 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4228 }
4229 return true;
4230 }
4231
4232 // Parse entry point called from JNI_CreateJavaVM
4233
4234 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4235 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4236
4237 // Initialize ranges and constraints
4238 CommandLineFlagRangeList::init();
4239 CommandLineFlagConstraintList::init();
4240
4241 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4242 const char* hotspotrc = ".hotspotrc";
4243 bool settings_file_specified = false;
4244 bool needs_hotspotrc_warning = false;
4245 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4246 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4247
4248 // Pointers to current working set of containers
4249 JavaVMInitArgs* cur_cmd_args;
4250 JavaVMInitArgs* cur_java_options_args;
4251 JavaVMInitArgs* cur_java_tool_options_args;
4252
4253 // Containers for modified/expanded options
4254 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4255 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4256 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4257
4258
4259 jint code =
4260 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4261 if (code != JNI_OK) {
4262 return code;
4263 }
4264
4265 code = parse_java_options_environment_variable(&initial_java_options_args);
4266 if (code != JNI_OK) {
4267 return code;
4268 }
4269
4270 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4271 &mod_java_tool_options_args,
4272 &cur_java_tool_options_args);
4273 if (code != JNI_OK) {
4274 return code;
4275 }
4276
4277 code = expand_vm_options_as_needed(initial_cmd_args,
4278 &mod_cmd_args,
4279 &cur_cmd_args);
4280 if (code != JNI_OK) {
4281 return code;
4282 }
4283
4284 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4285 &mod_java_options_args,
4286 &cur_java_options_args);
4287 if (code != JNI_OK) {
4288 return code;
4289 }
4290
4291 const char* flags_file = Arguments::get_jvm_flags_file();
4292 settings_file_specified = (flags_file != NULL);
4293
4294 if (IgnoreUnrecognizedVMOptions) {
4295 cur_cmd_args->ignoreUnrecognized = true;
4296 cur_java_tool_options_args->ignoreUnrecognized = true;
4297 cur_java_options_args->ignoreUnrecognized = true;
4298 }
4299
4300 // Parse specified settings file
4301 if (settings_file_specified) {
4302 if (!process_settings_file(flags_file, true,
4303 cur_cmd_args->ignoreUnrecognized)) {
4304 return JNI_EINVAL;
4305 }
4306 } else {
4307 #ifdef ASSERT
4308 // Parse default .hotspotrc settings file
4309 if (!process_settings_file(".hotspotrc", false,
4310 cur_cmd_args->ignoreUnrecognized)) {
4311 return JNI_EINVAL;
4312 }
4313 #else
4314 struct stat buf;
4315 if (os::stat(hotspotrc, &buf) == 0) {
4316 needs_hotspotrc_warning = true;
4317 }
4318 #endif
4319 }
4320
4321 if (PrintVMOptions) {
4322 print_options(cur_java_tool_options_args);
4323 print_options(cur_cmd_args);
4324 print_options(cur_java_options_args);
4325 }
4326
4327 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4328 jint result = parse_vm_init_args(cur_java_tool_options_args,
4329 cur_java_options_args,
4330 cur_cmd_args);
4331
4332 if (result != JNI_OK) {
4333 return result;
4334 }
4335
4336 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4337 SharedArchivePath = get_shared_archive_path();
4338 if (SharedArchivePath == NULL) {
4339 return JNI_ENOMEM;
4340 }
4341
4342 // Set up VerifySharedSpaces
4343 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4344 VerifySharedSpaces = true;
4345 }
4346
4347 // Delay warning until here so that we've had a chance to process
4348 // the -XX:-PrintWarnings flag
4349 if (needs_hotspotrc_warning) {
4350 warning("%s file is present but has been ignored. "
4351 "Run with -XX:Flags=%s to load the file.",
4352 hotspotrc, hotspotrc);
4353 }
4354
4355 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4356 UNSUPPORTED_OPTION(UseLargePages);
4357 #endif
4358
4359 ArgumentsExt::report_unsupported_options();
4360
4361 #ifndef PRODUCT
4362 if (TraceBytecodesAt != 0) {
4363 TraceBytecodes = true;
4364 }
4365 if (CountCompiledCalls) {
4366 if (UseCounterDecay) {
4367 warning("UseCounterDecay disabled because CountCalls is set");
4368 UseCounterDecay = false;
4369 }
4370 }
4371 #endif // PRODUCT
4372
4373 if (ScavengeRootsInCode == 0) {
4374 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4375 warning("Forcing ScavengeRootsInCode non-zero");
4376 }
4377 ScavengeRootsInCode = 1;
4378 }
4379
4380 if (!handle_deprecated_print_gc_flags()) {
4381 return JNI_EINVAL;
4382 }
4383
4384 // Set object alignment values.
4385 set_object_alignment();
4386
4387 #if !INCLUDE_CDS
4388 if (DumpSharedSpaces || RequireSharedSpaces) {
4389 jio_fprintf(defaultStream::error_stream(),
4390 "Shared spaces are not supported in this VM\n");
4391 return JNI_ERR;
4392 }
4393 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4394 warning("Shared spaces are not supported in this VM");
4395 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4396 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4397 }
4398 no_shared_spaces("CDS Disabled");
4399 #endif // INCLUDE_CDS
4400
4401 return JNI_OK;
4402 }
4403
4404 jint Arguments::apply_ergo() {
4405
4406 // Set flags based on ergonomics.
4407 set_ergonomics_flags();
4408
4409 set_shared_spaces_flags();
4410
4411 // Check the GC selections again.
4412 if (!check_gc_consistency()) {
4413 return JNI_EINVAL;
4414 }
4415
4416 if (TieredCompilation) {
4417 set_tiered_flags();
4418 } else {
4419 int max_compilation_policy_choice = 1;
4420 #ifdef COMPILER2
4421 max_compilation_policy_choice = 2;
4422 #endif
4423 // Check if the policy is valid.
4424 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4425 vm_exit_during_initialization(
4426 "Incompatible compilation policy selected", NULL);
4427 }
4428 // Scale CompileThreshold
4429 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4430 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4431 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4432 }
4433 }
4434
4435 #ifdef COMPILER2
4436 #ifndef PRODUCT
4437 if (PrintIdealGraphLevel > 0) {
4438 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4439 }
4440 #endif
4441 #endif
4442
4443 // Set heap size based on available physical memory
4444 set_heap_size();
4445
4446 ArgumentsExt::set_gc_specific_flags();
4447
4448 // Initialize Metaspace flags and alignments
4449 Metaspace::ergo_initialize();
4450
4451 // Set bytecode rewriting flags
4452 set_bytecode_flags();
4453
4454 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4455 jint code = set_aggressive_opts_flags();
4456 if (code != JNI_OK) {
4457 return code;
4458 }
4459
4460 // Turn off biased locking for locking debug mode flags,
4461 // which are subtly different from each other but neither works with
4462 // biased locking
4463 if (UseHeavyMonitors
4464 #ifdef COMPILER1
4465 || !UseFastLocking
4466 #endif // COMPILER1
4467 #if INCLUDE_JVMCI
4468 || !JVMCIUseFastLocking
4469 #endif
4470 ) {
4471 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4472 // flag set to true on command line; warn the user that they
4473 // can't enable biased locking here
4474 warning("Biased Locking is not supported with locking debug flags"
4475 "; ignoring UseBiasedLocking flag." );
4476 }
4477 UseBiasedLocking = false;
4478 }
4479
4480 #ifdef CC_INTERP
4481 // Clear flags not supported on zero.
4482 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4483 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4484 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4485 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4486 #endif // CC_INTERP
4487
4488 #ifdef COMPILER2
4489 if (!EliminateLocks) {
4490 EliminateNestedLocks = false;
4491 }
4492 if (!Inline) {
4493 IncrementalInline = false;
4494 }
4495 #ifndef PRODUCT
4496 if (!IncrementalInline) {
4497 AlwaysIncrementalInline = false;
4498 }
4499 #endif
4500 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4501 // nothing to use the profiling, turn if off
4502 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4503 }
4504 #endif
4505
4506 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4507 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4508 DebugNonSafepoints = true;
4509 }
4510
4511 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4512 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4513 }
4514
4515 #ifndef PRODUCT
4516 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4517 if (use_vm_log()) {
4518 LogVMOutput = true;
4519 }
4520 }
4521 #endif // PRODUCT
4522
4523 if (PrintCommandLineFlags) {
4524 CommandLineFlags::printSetFlags(tty);
4525 }
4526
4527 // Apply CPU specific policy for the BiasedLocking
4528 if (UseBiasedLocking) {
4529 if (!VM_Version::use_biased_locking() &&
4530 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4531 UseBiasedLocking = false;
4532 }
4533 }
4534 #ifdef COMPILER2
4535 if (!UseBiasedLocking || EmitSync != 0) {
4536 UseOptoBiasInlining = false;
4537 }
4538 #endif
4539
4540 return JNI_OK;
4541 }
4542
4543 jint Arguments::adjust_after_os() {
4544 if (UseNUMA) {
4545 if (UseParallelGC || UseParallelOldGC) {
4546 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4547 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4548 }
4549 }
4550 // UseNUMAInterleaving is set to ON for all collectors and
4551 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4552 // such as the parallel collector for Linux and Solaris will
4553 // interleave old gen and survivor spaces on top of NUMA
4554 // allocation policy for the eden space.
4555 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4556 // all platforms and ParallelGC on Windows will interleave all
4557 // of the heap spaces across NUMA nodes.
4558 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4559 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4560 }
4561 }
4562 return JNI_OK;
4563 }
4564
4565 int Arguments::PropertyList_count(SystemProperty* pl) {
4566 int count = 0;
4567 while(pl != NULL) {
4568 count++;
4569 pl = pl->next();
4570 }
4571 return count;
4572 }
4573
4574 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4575 assert(key != NULL, "just checking");
4576 SystemProperty* prop;
4577 for (prop = pl; prop != NULL; prop = prop->next()) {
4578 if (strcmp(key, prop->key()) == 0) return prop->value();
4579 }
4580 return NULL;
4581 }
4582
4583 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4584 int count = 0;
4585 const char* ret_val = NULL;
4586
4587 while(pl != NULL) {
4588 if(count >= index) {
4589 ret_val = pl->key();
4590 break;
4591 }
4592 count++;
4593 pl = pl->next();
4594 }
4595
4596 return ret_val;
4597 }
4598
4599 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4600 int count = 0;
4601 char* ret_val = NULL;
4602
4603 while(pl != NULL) {
4604 if(count >= index) {
4605 ret_val = pl->value();
4606 break;
4607 }
4608 count++;
4609 pl = pl->next();
4610 }
4611
4612 return ret_val;
4613 }
4614
4615 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4616 SystemProperty* p = *plist;
4617 if (p == NULL) {
4618 *plist = new_p;
4619 } else {
4620 while (p->next() != NULL) {
4621 p = p->next();
4622 }
4623 p->set_next(new_p);
4624 }
4625 }
4626
4627 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v) {
4628 if (plist == NULL)
4629 return;
4630
4631 SystemProperty* new_p = new SystemProperty(k, v, true);
4632 PropertyList_add(plist, new_p);
4633 }
4634
4635 void Arguments::PropertyList_add(SystemProperty *element) {
4636 PropertyList_add(&_system_properties, element);
4637 }
4638
4639 // This add maintains unique property key in the list.
4640 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, jboolean append) {
4641 if (plist == NULL)
4642 return;
4643
4644 // If property key exist then update with new value.
4645 SystemProperty* prop;
4646 for (prop = *plist; prop != NULL; prop = prop->next()) {
4647 if (strcmp(k, prop->key()) == 0) {
4648 if (append) {
4649 prop->append_value(v);
4650 } else {
4651 prop->set_writeable_value(v);
4652 }
4653 return;
4654 }
4655 }
4656
4657 PropertyList_add(plist, k, v);
4658 }
4659
4660 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4661 // Returns true if all of the source pointed by src has been copied over to
4662 // the destination buffer pointed by buf. Otherwise, returns false.
4663 // Notes:
4664 // 1. If the length (buflen) of the destination buffer excluding the
4665 // NULL terminator character is not long enough for holding the expanded
4666 // pid characters, it also returns false instead of returning the partially
4667 // expanded one.
4668 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4669 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4670 char* buf, size_t buflen) {
4671 const char* p = src;
4672 char* b = buf;
4673 const char* src_end = &src[srclen];
4674 char* buf_end = &buf[buflen - 1];
4675
4676 while (p < src_end && b < buf_end) {
4677 if (*p == '%') {
4678 switch (*(++p)) {
4679 case '%': // "%%" ==> "%"
4680 *b++ = *p++;
4681 break;
4682 case 'p': { // "%p" ==> current process id
4683 // buf_end points to the character before the last character so
4684 // that we could write '\0' to the end of the buffer.
4685 size_t buf_sz = buf_end - b + 1;
4686 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4687
4688 // if jio_snprintf fails or the buffer is not long enough to hold
4689 // the expanded pid, returns false.
4690 if (ret < 0 || ret >= (int)buf_sz) {
4691 return false;
4692 } else {
4693 b += ret;
4694 assert(*b == '\0', "fail in copy_expand_pid");
4695 if (p == src_end && b == buf_end + 1) {
4696 // reach the end of the buffer.
4697 return true;
4698 }
4699 }
4700 p++;
4701 break;
4702 }
4703 default :
4704 *b++ = '%';
4705 }
4706 } else {
4707 *b++ = *p++;
4708 }
4709 }
4710 *b = '\0';
4711 return (p == src_end); // return false if not all of the source was copied
4712 }