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