1 /*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "code/codeCacheExtensions.hpp"
31 #include "gc/shared/cardTableRS.hpp"
32 #include "gc/shared/genCollectedHeap.hpp"
33 #include "gc/shared/referenceProcessor.hpp"
34 #include "gc/shared/taskqueue.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logTag.hpp"
37 #include "logging/logConfiguration.hpp"
38 #include "memory/allocation.inline.hpp"
39 #include "memory/universe.inline.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "prims/jvmtiExport.hpp"
42 #include "runtime/arguments.hpp"
43 #include "runtime/arguments_ext.hpp"
44 #include "runtime/commandLineFlagConstraintList.hpp"
45 #include "runtime/commandLineFlagRangeList.hpp"
46 #include "runtime/globals.hpp"
47 #include "runtime/globals_extension.hpp"
48 #include "runtime/java.hpp"
49 #include "runtime/os.hpp"
50 #include "runtime/vm_version.hpp"
51 #include "services/management.hpp"
52 #include "services/memTracker.hpp"
53 #include "utilities/defaultStream.hpp"
54 #include "utilities/macros.hpp"
55 #include "utilities/stringUtils.hpp"
56 #if INCLUDE_JVMCI
57 #include "jvmci/jvmciRuntime.hpp"
58 #endif
59 #if INCLUDE_ALL_GCS
60 #include "gc/cms/compactibleFreeListSpace.hpp"
61 #include "gc/g1/g1CollectedHeap.inline.hpp"
62 #include "gc/parallel/parallelScavengeHeap.hpp"
63 #endif // INCLUDE_ALL_GCS
64
65 // Note: This is a special bug reporting site for the JVM
66 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
67 #define DEFAULT_JAVA_LAUNCHER "generic"
68
69 char* Arguments::_jvm_flags_file = NULL;
70 char** Arguments::_jvm_flags_array = NULL;
71 int Arguments::_num_jvm_flags = 0;
72 char** Arguments::_jvm_args_array = NULL;
73 int Arguments::_num_jvm_args = 0;
74 char* Arguments::_java_command = NULL;
75 SystemProperty* Arguments::_system_properties = NULL;
76 const char* Arguments::_gc_log_filename = NULL;
77 bool Arguments::_has_profile = false;
78 size_t Arguments::_conservative_max_heap_alignment = 0;
79 size_t Arguments::_min_heap_size = 0;
80 Arguments::Mode Arguments::_mode = _mixed;
81 bool Arguments::_java_compiler = false;
82 bool Arguments::_xdebug_mode = false;
83 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
84 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
85 int Arguments::_sun_java_launcher_pid = -1;
86 bool Arguments::_sun_java_launcher_is_altjvm = false;
87 int Arguments::_patch_dirs_count = 0;
88 char** Arguments::_patch_dirs = NULL;
89 int Arguments::_bootclassloader_append_index = -1;
90
91 // These parameters are reset in method parse_vm_init_args()
92 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
93 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
94 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
95 bool Arguments::_ClipInlining = ClipInlining;
96 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
97 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
98
99 char* Arguments::SharedArchivePath = NULL;
100
101 AgentLibraryList Arguments::_libraryList;
102 AgentLibraryList Arguments::_agentList;
103
104 abort_hook_t Arguments::_abort_hook = NULL;
105 exit_hook_t Arguments::_exit_hook = NULL;
106 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
107
108
109 SystemProperty *Arguments::_sun_boot_library_path = NULL;
110 SystemProperty *Arguments::_java_library_path = NULL;
111 SystemProperty *Arguments::_java_home = NULL;
112 SystemProperty *Arguments::_java_class_path = NULL;
113 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
114
115 PathString *Arguments::_system_boot_class_path = NULL;
116
117 char* Arguments::_ext_dirs = NULL;
118
119 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
120 // part of the option string.
121 static bool match_option(const JavaVMOption *option, const char* name,
122 const char** tail) {
123 size_t len = strlen(name);
124 if (strncmp(option->optionString, name, len) == 0) {
125 *tail = option->optionString + len;
126 return true;
127 } else {
128 return false;
129 }
130 }
131
132 // Check if 'option' matches 'name'. No "tail" is allowed.
133 static bool match_option(const JavaVMOption *option, const char* name) {
134 const char* tail = NULL;
135 bool result = match_option(option, name, &tail);
136 if (tail != NULL && *tail == '\0') {
137 return result;
138 } else {
139 return false;
140 }
141 }
142
143 // Return true if any of the strings in null-terminated array 'names' matches.
144 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
145 // the option must match exactly.
146 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
147 bool tail_allowed) {
148 for (/* empty */; *names != NULL; ++names) {
149 if (match_option(option, *names, tail)) {
150 if (**tail == '\0' || tail_allowed && **tail == ':') {
151 return true;
152 }
153 }
154 }
155 return false;
156 }
157
158 static void logOption(const char* opt) {
159 if (PrintVMOptions) {
160 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
161 }
162 }
163
164 // Process java launcher properties.
165 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
166 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
167 // sun.java.launcher.pid is defined.
168 // Must do this before setting up other system properties,
169 // as some of them may depend on launcher type.
170 for (int index = 0; index < args->nOptions; index++) {
171 const JavaVMOption* option = args->options + index;
172 const char* tail;
173
174 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
175 process_java_launcher_argument(tail, option->extraInfo);
176 continue;
177 }
178 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
179 if (strcmp(tail, "true") == 0) {
180 _sun_java_launcher_is_altjvm = true;
181 }
182 continue;
183 }
184 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
185 _sun_java_launcher_pid = atoi(tail);
186 continue;
187 }
188 }
189 }
190
191 // Initialize system properties key and value.
192 void Arguments::init_system_properties() {
193
194 // Set up _system_boot_class_path which is not a property but
195 // relies heavily on argument processing and the jdk.boot.class.path.append
196 // property. It is used to store the underlying system boot class path.
197 _system_boot_class_path = new PathString(NULL);
198
199 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
200 "Java Virtual Machine Specification", false));
201 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
202 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
203 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
204 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
205
206 // Following are JVMTI agent writable properties.
207 // Properties values are set to NULL and they are
208 // os specific they are initialized in os::init_system_properties_values().
209 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
210 _java_library_path = new SystemProperty("java.library.path", NULL, true);
211 _java_home = new SystemProperty("java.home", NULL, true);
212 _java_class_path = new SystemProperty("java.class.path", "", true);
213 // jdk.boot.class.path.append is a non-writeable, internal property.
214 // It can only be set by either:
215 // - -Xbootclasspath/a:
216 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
217 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
218
219 // Add to System Property list.
220 PropertyList_add(&_system_properties, _sun_boot_library_path);
221 PropertyList_add(&_system_properties, _java_library_path);
222 PropertyList_add(&_system_properties, _java_home);
223 PropertyList_add(&_system_properties, _java_class_path);
224 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
225
226 // Set OS specific system properties values
227 os::init_system_properties_values();
228 }
229
230 // Update/Initialize System properties after JDK version number is known
231 void Arguments::init_version_specific_system_properties() {
232 enum { bufsz = 16 };
233 char buffer[bufsz];
234 const char* spec_vendor = "Oracle Corporation";
235 uint32_t spec_version = JDK_Version::current().major_version();
236
237 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
238
239 PropertyList_add(&_system_properties,
240 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
241 PropertyList_add(&_system_properties,
242 new SystemProperty("java.vm.specification.version", buffer, false));
243 PropertyList_add(&_system_properties,
244 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
245 }
246
247 /*
248 * -XX argument processing:
249 *
250 * -XX arguments are defined in several places, such as:
251 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
252 * -XX arguments are parsed in parse_argument().
253 * -XX argument bounds checking is done in check_vm_args_consistency().
254 *
255 * Over time -XX arguments may change. There are mechanisms to handle common cases:
256 *
257 * ALIASED: An option that is simply another name for another option. This is often
258 * part of the process of deprecating a flag, but not all aliases need
259 * to be deprecated.
260 *
261 * Create an alias for an option by adding the old and new option names to the
262 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
263 *
264 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
265 * support may be removed in the future. Both regular and aliased options may be
266 * deprecated.
267 *
268 * Add a deprecation warning for an option (or alias) by adding an entry in the
269 * "special_jvm_flags" table and setting the "deprecated_in" field.
270 * Often an option "deprecated" in one major release will
271 * be made "obsolete" in the next. In this case the entry should also have it's
272 * "obsolete_in" field set.
273 *
274 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
275 * on the command line. A warning is printed to let the user know that option might not
276 * be accepted in the future.
277 *
278 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
279 * table and setting the "obsolete_in" field.
280 *
281 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
282 * to the current JDK version. The system will flatly refuse to admit the existence of
283 * the flag. This allows a flag to die automatically over JDK releases.
284 *
285 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
286 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
287 * - Newly obsolete or expired deprecated options should have their global variable
288 * definitions removed (from globals.hpp, etc) and related implementations removed.
289 *
290 * Recommended approach for removing options:
291 *
292 * To remove options commonly used by customers (e.g. product, commercial -XX options), use
293 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
294 *
295 * To remove internal options (e.g. diagnostic, experimental, develop options), use
296 * a 2-step model adding major release numbers to the obsolete and expire columns.
297 *
298 * To change the name of an option, use the alias table as well as a 2-step
299 * model adding major release numbers to the deprecate and expire columns.
300 * Think twice about aliasing commonly used customer options.
301 *
302 * There are times when it is appropriate to leave a future release number as undefined.
303 *
304 * Tests: Aliases should be tested in VMAliasOptions.java.
305 * Deprecated options should be tested in VMDeprecatedOptions.java.
306 */
307
308 // Obsolete or deprecated -XX flag.
309 typedef struct {
310 const char* name;
311 JDK_Version deprecated_in; // When the deprecation warning started (or "undefined").
312 JDK_Version obsolete_in; // When the obsolete warning started (or "undefined").
313 JDK_Version expired_in; // When the option expires (or "undefined").
314 } SpecialFlag;
315
316 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
317 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
318 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
319 // the command-line as usual, but will issue a warning.
320 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
321 // the command-line, while issuing a warning and ignoring the flag value.
322 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
323 // existence of the flag.
324 //
325 // MANUAL CLEANUP ON JDK VERSION UPDATES:
326 // This table ensures that the handling of options will update automatically when the JDK
327 // version is incremented, but the source code needs to be cleanup up manually:
328 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
329 // variable should be removed, as well as users of the variable.
330 // - As "deprecated" options age into "obsolete" options, move the entry into the
331 // "Obsolete Flags" section of the table.
332 // - All expired options should be removed from the table.
333 static SpecialFlag const special_jvm_flags[] = {
334 // -------------- Deprecated Flags --------------
335 // --- Non-alias flags - sorted by obsolete_in then expired_in:
336 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
337 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
338 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
339 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) },
340
341 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
342 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
343 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
344 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
345 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
346 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
347 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
348 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
349
350 // -------------- Obsolete Flags - sorted by expired_in --------------
351 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
352 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
353 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
354 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
355 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
356 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
357 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
358 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
359 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
360 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
361 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
362 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
363 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
364 #ifndef ZERO
365 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
366 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
367 #endif // ZERO
368 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
369 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
370 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
371 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
372 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
373 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
374 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
375 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
376 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
377 { "SegmentedHeapDumpThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
378 { "PrintOopAddress", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
379
380 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
381 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
382 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
383 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
384 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
385 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
386 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
387 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
388 #endif
389
390 { NULL, JDK_Version(0), JDK_Version(0) }
391 };
392
393 // Flags that are aliases for other flags.
394 typedef struct {
395 const char* alias_name;
396 const char* real_name;
397 } AliasedFlag;
398
399 static AliasedFlag const aliased_jvm_flags[] = {
400 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
401 { "CMSMarkStackSizeMax", "MarkStackSizeMax" },
402 { "CMSMarkStackSize", "MarkStackSize" },
403 { "G1MarkStackSize", "MarkStackSize" },
404 { "ParallelMarkingThreads", "ConcGCThreads" },
405 { "ParallelCMSThreads", "ConcGCThreads" },
406 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
407 { NULL, NULL}
408 };
409
410 // NOTE: A compatibility request will be necessary for each alias to be removed.
411 static AliasedLoggingFlag const aliased_logging_flags[] = {
412 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
413 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
414 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
415 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
416 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
417 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
418 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
419 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
420 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
421 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) },
422 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
423 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
424 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
425 };
426
427 #ifndef PRODUCT
428 // These options are removed in jdk9. Remove this code for jdk10.
429 static AliasedFlag const removed_develop_logging_flags[] = {
430 { "TraceClassInitialization", "-Xlog:class+init" },
431 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
432 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
433 { "TraceItables", "-Xlog:itables=debug" },
434 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
435 { "TraceSafepoint", "-Xlog:safepoint=debug" },
436 { "TraceStartupTime", "-Xlog:startuptime" },
437 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
438 { "PrintVtables", "-Xlog:vtables=debug" },
439 { "VerboseVerification", "-Xlog:verification" },
440 { NULL, NULL }
441 };
442 #endif //PRODUCT
443
444 // Return true if "v" is less than "other", where "other" may be "undefined".
445 static bool version_less_than(JDK_Version v, JDK_Version other) {
446 assert(!v.is_undefined(), "must be defined");
447 if (!other.is_undefined() && v.compare(other) >= 0) {
448 return false;
449 } else {
450 return true;
451 }
452 }
453
454 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
455 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
456 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
457 flag = special_jvm_flags[i];
458 return true;
459 }
460 }
461 return false;
462 }
463
464 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
465 assert(version != NULL, "Must provide a version buffer");
466 SpecialFlag flag;
467 if (lookup_special_flag(flag_name, flag)) {
468 if (!flag.obsolete_in.is_undefined()) {
469 if (version_less_than(JDK_Version::current(), flag.expired_in)) {
470 *version = flag.obsolete_in;
471 return true;
472 }
473 }
474 }
475 return false;
476 }
477
478 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
479 assert(version != NULL, "Must provide a version buffer");
480 SpecialFlag flag;
481 if (lookup_special_flag(flag_name, flag)) {
482 if (!flag.deprecated_in.is_undefined()) {
483 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
484 version_less_than(JDK_Version::current(), flag.expired_in)) {
485 *version = flag.deprecated_in;
486 return 1;
487 } else {
488 return -1;
489 }
490 }
491 }
492 return 0;
493 }
494
495 #ifndef PRODUCT
496 const char* Arguments::removed_develop_logging_flag_name(const char* name){
497 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
498 const AliasedFlag& flag = removed_develop_logging_flags[i];
499 if (strcmp(flag.alias_name, name) == 0) {
500 return flag.real_name;
501 }
502 }
503 return NULL;
504 }
505 #endif // PRODUCT
506
507 const char* Arguments::real_flag_name(const char *flag_name) {
508 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
509 const AliasedFlag& flag_status = aliased_jvm_flags[i];
510 if (strcmp(flag_status.alias_name, flag_name) == 0) {
511 return flag_status.real_name;
512 }
513 }
514 return flag_name;
515 }
516
517 #ifdef ASSERT
518 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
519 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
520 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
521 return true;
522 }
523 }
524 return false;
525 }
526
527 static bool verify_special_jvm_flags() {
528 bool success = true;
529 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
530 const SpecialFlag& flag = special_jvm_flags[i];
531 if (lookup_special_flag(flag.name, i)) {
532 warning("Duplicate special flag declaration \"%s\"", flag.name);
533 success = false;
534 }
535 if (flag.deprecated_in.is_undefined() &&
536 flag.obsolete_in.is_undefined()) {
537 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
538 success = false;
539 }
540
541 if (!flag.deprecated_in.is_undefined()) {
542 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
543 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
544 success = false;
545 }
546
547 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
548 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
549 success = false;
550 }
551 }
552
553 if (!flag.obsolete_in.is_undefined()) {
554 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
555 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
556 success = false;
557 }
558
559 // if flag has become obsolete it should not have a "globals" flag defined anymore.
560 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
561 if (Flag::find_flag(flag.name) != NULL) {
562 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
563 success = false;
564 }
565 }
566 }
567
568 if (!flag.expired_in.is_undefined()) {
569 // if flag has become expired it should not have a "globals" flag defined anymore.
570 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
571 if (Flag::find_flag(flag.name) != NULL) {
572 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
573 success = false;
574 }
575 }
576 }
577
578 }
579 return success;
580 }
581 #endif
582
583 // Constructs the system boot class path from the following components, in order:
584 //
585 // prefix // from -Xpatch:...
586 // base // from os::get_system_properties()
587 // suffix // from -Xbootclasspath/a:...
588 //
589 // This could be AllStatic, but it isn't needed after argument processing is
590 // complete. After argument processing, the combined components are copied
591 // to Arguments::_system_boot_class_path via a call to Arguments::set_sysclasspath.
592 class ArgumentBootClassPath: public StackObj {
593 public:
594 ArgumentBootClassPath(const char* base);
595 ~ArgumentBootClassPath();
596
597 inline void set_base(const char* base);
598 inline void add_prefix(const char* prefix);
599 inline void add_suffix_to_prefix(const char* suffix);
600 inline void add_suffix(const char* suffix);
601 inline void reset_path(const char* base);
602
603 inline const char* get_base() const { return _items[_bcp_base]; }
604 inline const char* get_prefix() const { return _items[_bcp_prefix]; }
605 inline const char* get_suffix() const { return _items[_bcp_suffix]; }
606
607 // Combine all the components into a single c-heap-allocated string; caller
608 // must free the string if/when no longer needed.
609 char* combined_path();
610
611 private:
612 // Utility routines.
613 static char* add_to_path(const char* path, const char* str, bool prepend);
614 static char* add_jars_to_path(char* path, const char* directory);
615
616 inline void reset_item_at(int index);
617
618 // Array indices for the items that make up the sysclasspath. All except the
619 // base are allocated in the C heap and freed by this class.
620 enum {
621 _bcp_prefix, // was -Xpatch:...
622 _bcp_base, // the default system boot class path
623 _bcp_suffix, // from -Xbootclasspath/a:...
624 _bcp_nitems // the number of items, must be last.
625 };
626
627 const char* _items[_bcp_nitems];
628 };
629
630 ArgumentBootClassPath::ArgumentBootClassPath(const char* base) {
631 memset(_items, 0, sizeof(_items));
632 _items[_bcp_base] = base;
633 }
634
635 ArgumentBootClassPath::~ArgumentBootClassPath() {
636 // Free everything except the base.
637 for (int i = 0; i < _bcp_nitems; ++i) {
638 if (i != _bcp_base) reset_item_at(i);
639 }
640 }
641
642 inline void ArgumentBootClassPath::set_base(const char* base) {
643 _items[_bcp_base] = base;
644 }
645
646 inline void ArgumentBootClassPath::add_prefix(const char* prefix) {
647 _items[_bcp_prefix] = add_to_path(_items[_bcp_prefix], prefix, true);
648 }
649
650 inline void ArgumentBootClassPath::add_suffix_to_prefix(const char* suffix) {
651 _items[_bcp_prefix] = add_to_path(_items[_bcp_prefix], suffix, false);
652 }
653
654 inline void ArgumentBootClassPath::add_suffix(const char* suffix) {
655 _items[_bcp_suffix] = add_to_path(_items[_bcp_suffix], suffix, false);
656 }
657
658 inline void ArgumentBootClassPath::reset_item_at(int index) {
659 assert(index < _bcp_nitems && index != _bcp_base, "just checking");
660 if (_items[index] != NULL) {
661 FREE_C_HEAP_ARRAY(char, _items[index]);
662 _items[index] = NULL;
663 }
664 }
665
666 inline void ArgumentBootClassPath::reset_path(const char* base) {
667 // Clear the prefix and suffix.
668 reset_item_at(_bcp_prefix);
669 reset_item_at(_bcp_suffix);
670 set_base(base);
671 }
672
673 //------------------------------------------------------------------------------
674
675
676 // Combine the bootclasspath elements, some of which may be null, into a single
677 // c-heap-allocated string.
678 char* ArgumentBootClassPath::combined_path() {
679 assert(_items[_bcp_base] != NULL, "empty default sysclasspath");
680
681 size_t lengths[_bcp_nitems];
682 size_t total_len = 0;
683
684 const char separator = *os::path_separator();
685
686 // Get the lengths.
687 int i;
688 for (i = 0; i < _bcp_nitems; ++i) {
689 if (i == _bcp_suffix) {
690 // Record index of boot loader's append path.
691 Arguments::set_bootclassloader_append_index((int)total_len);
692 }
693 if (_items[i] != NULL) {
694 lengths[i] = strlen(_items[i]);
695 // Include space for the separator char (or a NULL for the last item).
696 total_len += lengths[i] + 1;
697 }
698 }
699 assert(total_len > 0, "empty sysclasspath not allowed");
700
701 // Copy the _items to a single string.
702 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtArguments);
703 char* cp_tmp = cp;
704 for (i = 0; i < _bcp_nitems; ++i) {
705 if (_items[i] != NULL) {
706 memcpy(cp_tmp, _items[i], lengths[i]);
707 cp_tmp += lengths[i];
708 *cp_tmp++ = separator;
709 }
710 }
711 *--cp_tmp = '\0'; // Replace the extra separator.
712 return cp;
713 }
714
715 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
716 char*
717 ArgumentBootClassPath::add_to_path(const char* path, const char* str, bool prepend) {
718 char *cp;
719
720 assert(str != NULL, "just checking");
721 if (path == NULL) {
722 size_t len = strlen(str) + 1;
723 cp = NEW_C_HEAP_ARRAY(char, len, mtArguments);
724 memcpy(cp, str, len); // copy the trailing null
725 } else {
726 const char separator = *os::path_separator();
727 size_t old_len = strlen(path);
728 size_t str_len = strlen(str);
729 size_t len = old_len + str_len + 2;
730
731 if (prepend) {
732 cp = NEW_C_HEAP_ARRAY(char, len, mtArguments);
733 char* cp_tmp = cp;
734 memcpy(cp_tmp, str, str_len);
735 cp_tmp += str_len;
736 *cp_tmp = separator;
737 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
738 FREE_C_HEAP_ARRAY(char, path);
739 } else {
740 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtArguments);
741 char* cp_tmp = cp + old_len;
742 *cp_tmp = separator;
743 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
744 }
745 }
746 return cp;
747 }
748
749 // Scan the directory and append any jar or zip files found to path.
750 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
751 char* ArgumentBootClassPath::add_jars_to_path(char* path, const char* directory) {
752 DIR* dir = os::opendir(directory);
753 if (dir == NULL) return path;
754
755 char dir_sep[2] = { '\0', '\0' };
756 size_t directory_len = strlen(directory);
757 const char fileSep = *os::file_separator();
758 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
759
760 /* Scan the directory for jars/zips, appending them to path. */
761 struct dirent *entry;
762 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
763 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
764 const char* name = entry->d_name;
765 const char* ext = name + strlen(name) - 4;
766 bool isJarOrZip = ext > name &&
767 (os::file_name_strcmp(ext, ".jar") == 0 ||
768 os::file_name_strcmp(ext, ".zip") == 0);
769 if (isJarOrZip) {
770 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtArguments);
771 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
772 path = add_to_path(path, jarpath, false);
773 FREE_C_HEAP_ARRAY(char, jarpath);
774 }
775 }
776 FREE_C_HEAP_ARRAY(char, dbuf);
777 os::closedir(dir);
778 return path;
779 }
780
781 // Parses a memory size specification string.
782 static bool atomull(const char *s, julong* result) {
783 julong n = 0;
784 int args_read = 0;
785 bool is_hex = false;
786 // Skip leading 0[xX] for hexadecimal
787 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
788 s += 2;
789 is_hex = true;
790 args_read = sscanf(s, JULONG_FORMAT_X, &n);
791 } else {
792 args_read = sscanf(s, JULONG_FORMAT, &n);
793 }
794 if (args_read != 1) {
795 return false;
796 }
797 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
798 s++;
799 }
800 // 4705540: illegal if more characters are found after the first non-digit
801 if (strlen(s) > 1) {
802 return false;
803 }
804 switch (*s) {
805 case 'T': case 't':
806 *result = n * G * K;
807 // Check for overflow.
808 if (*result/((julong)G * K) != n) return false;
809 return true;
810 case 'G': case 'g':
811 *result = n * G;
812 if (*result/G != n) return false;
813 return true;
814 case 'M': case 'm':
815 *result = n * M;
816 if (*result/M != n) return false;
817 return true;
818 case 'K': case 'k':
819 *result = n * K;
820 if (*result/K != n) return false;
821 return true;
822 case '\0':
823 *result = n;
824 return true;
825 default:
826 return false;
827 }
828 }
829
830 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
831 if (size < min_size) return arg_too_small;
832 // Check that size will fit in a size_t (only relevant on 32-bit)
833 if (size > max_uintx) return arg_too_big;
834 return arg_in_range;
835 }
836
837 // Describe an argument out of range error
838 void Arguments::describe_range_error(ArgsRange errcode) {
839 switch(errcode) {
840 case arg_too_big:
841 jio_fprintf(defaultStream::error_stream(),
842 "The specified size exceeds the maximum "
843 "representable size.\n");
844 break;
845 case arg_too_small:
846 case arg_unreadable:
847 case arg_in_range:
848 // do nothing for now
849 break;
850 default:
851 ShouldNotReachHere();
852 }
853 }
854
855 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
856 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
857 return true;
858 } else {
859 return false;
860 }
861 }
862
863 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
864 char* end;
865 errno = 0;
866 double v = strtod(value, &end);
867 if ((errno != 0) || (*end != 0)) {
868 return false;
869 }
870
871 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
872 return true;
873 }
874 return false;
875 }
876
877 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
878 julong v;
879 int int_v;
880 intx intx_v;
881 bool is_neg = false;
882 Flag* result = Flag::find_flag(name, strlen(name));
883
884 if (result == NULL) {
885 return false;
886 }
887
888 // Check the sign first since atomull() parses only unsigned values.
889 if (*value == '-') {
890 if (!result->is_intx() && !result->is_int()) {
891 return false;
892 }
893 value++;
894 is_neg = true;
895 }
896 if (!atomull(value, &v)) {
897 return false;
898 }
899 if (result->is_int()) {
900 int_v = (int) v;
901 if (is_neg) {
902 int_v = -int_v;
903 }
904 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
905 } else if (result->is_uint()) {
906 uint uint_v = (uint) v;
907 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
908 } else if (result->is_intx()) {
909 intx_v = (intx) v;
910 if (is_neg) {
911 intx_v = -intx_v;
912 }
913 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
914 } else if (result->is_uintx()) {
915 uintx uintx_v = (uintx) v;
916 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
917 } else if (result->is_uint64_t()) {
918 uint64_t uint64_t_v = (uint64_t) v;
919 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
920 } else if (result->is_size_t()) {
921 size_t size_t_v = (size_t) v;
922 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
923 } else {
924 return false;
925 }
926 }
927
928 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
929 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
930 // Contract: CommandLineFlags always returns a pointer that needs freeing.
931 FREE_C_HEAP_ARRAY(char, value);
932 return true;
933 }
934
935 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
936 const char* old_value = "";
937 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
938 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
939 size_t new_len = strlen(new_value);
940 const char* value;
941 char* free_this_too = NULL;
942 if (old_len == 0) {
943 value = new_value;
944 } else if (new_len == 0) {
945 value = old_value;
946 } else {
947 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtArguments);
948 // each new setting adds another LINE to the switch:
949 sprintf(buf, "%s\n%s", old_value, new_value);
950 value = buf;
951 free_this_too = buf;
952 }
953 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
954 // CommandLineFlags always returns a pointer that needs freeing.
955 FREE_C_HEAP_ARRAY(char, value);
956 if (free_this_too != NULL) {
957 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
958 FREE_C_HEAP_ARRAY(char, free_this_too);
959 }
960 return true;
961 }
962
963 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
964 const char* real_name = real_flag_name(arg);
965 JDK_Version since = JDK_Version();
966 switch (is_deprecated_flag(arg, &since)) {
967 case -1:
968 return NULL; // obsolete or expired, don't process normally
969 case 0:
970 return real_name;
971 case 1: {
972 if (warn) {
973 char version[256];
974 since.to_string(version, sizeof(version));
975 if (real_name != arg) {
976 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
977 arg, version, real_name);
978 } else {
979 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
980 arg, version);
981 }
982 }
983 return real_name;
984 }
985 }
986 ShouldNotReachHere();
987 return NULL;
988 }
989
990 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
991 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
992 // Set tagset string buffer at max size of 256, large enough for any alias tagset
993 const int max_tagset_size = 256;
994 int max_tagset_len = max_tagset_size - 1;
995 char tagset_buffer[max_tagset_size];
996 tagset_buffer[0] = '\0';
997
998 // Write tag-set for aliased logging option, in string list form
999 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
1000 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
1001 if (i > 0) {
1002 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
1003 }
1004 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
1005 }
1006
1007 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
1008 (on) ? "+" : "-",
1009 name,
1010 tagset_buffer,
1011 (on) ? LogLevel::name(alf.level) : "off");
1012 }
1013
1014 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1015 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1016 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1017 if (strcmp(alf.alias_name, name) == 0) {
1018 log_deprecated_flag(name, on, alf);
1019 return alf;
1020 }
1021 }
1022 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1023 return a;
1024 }
1025
1026 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
1027
1028 // range of acceptable characters spelled out for portability reasons
1029 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1030 #define BUFLEN 255
1031 char name[BUFLEN+1];
1032 char dummy;
1033 const char* real_name;
1034 bool warn_if_deprecated = true;
1035
1036 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1037 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1038 if (alf.alias_name != NULL){
1039 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1040 return true;
1041 }
1042 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1043 if (real_name == NULL) {
1044 return false;
1045 }
1046 return set_bool_flag(real_name, false, origin);
1047 }
1048 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1049 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1050 if (alf.alias_name != NULL){
1051 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1052 return true;
1053 }
1054 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1055 if (real_name == NULL) {
1056 return false;
1057 }
1058 return set_bool_flag(real_name, true, origin);
1059 }
1060
1061 char punct;
1062 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1063 const char* value = strchr(arg, '=') + 1;
1064 Flag* flag;
1065
1066 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1067 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1068 if (real_name == NULL) {
1069 return false;
1070 }
1071 flag = Flag::find_flag(real_name);
1072 if (flag != NULL && flag->is_ccstr()) {
1073 if (flag->ccstr_accumulates()) {
1074 return append_to_string_flag(real_name, value, origin);
1075 } else {
1076 if (value[0] == '\0') {
1077 value = NULL;
1078 }
1079 return set_string_flag(real_name, value, origin);
1080 }
1081 } else {
1082 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1083 }
1084 }
1085
1086 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1087 const char* value = strchr(arg, '=') + 1;
1088 // -XX:Foo:=xxx will reset the string flag to the given value.
1089 if (value[0] == '\0') {
1090 value = NULL;
1091 }
1092 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1093 if (real_name == NULL) {
1094 return false;
1095 }
1096 return set_string_flag(real_name, value, origin);
1097 }
1098
1099 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1100 #define SIGNED_NUMBER_RANGE "[-0123456789]"
1101 #define NUMBER_RANGE "[0123456789eE+-]"
1102 char value[BUFLEN + 1];
1103 char value2[BUFLEN + 1];
1104 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1105 // Looks like a floating-point number -- try again with more lenient format string
1106 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1107 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1108 if (real_name == NULL) {
1109 return false;
1110 }
1111 return set_fp_numeric_flag(real_name, value, origin);
1112 }
1113 }
1114
1115 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1116 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1117 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1118 if (real_name == NULL) {
1119 return false;
1120 }
1121 return set_numeric_flag(real_name, value, origin);
1122 }
1123
1124 return false;
1125 }
1126
1127 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1128 assert(bldarray != NULL, "illegal argument");
1129
1130 if (arg == NULL) {
1131 return;
1132 }
1133
1134 int new_count = *count + 1;
1135
1136 // expand the array and add arg to the last element
1137 if (*bldarray == NULL) {
1138 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1139 } else {
1140 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1141 }
1142 (*bldarray)[*count] = os::strdup_check_oom(arg);
1143 *count = new_count;
1144 }
1145
1146 void Arguments::build_jvm_args(const char* arg) {
1147 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1148 }
1149
1150 void Arguments::build_jvm_flags(const char* arg) {
1151 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1152 }
1153
1154 // utility function to return a string that concatenates all
1155 // strings in a given char** array
1156 const char* Arguments::build_resource_string(char** args, int count) {
1157 if (args == NULL || count == 0) {
1158 return NULL;
1159 }
1160 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
1161 for (int i = 1; i < count; i++) {
1162 length += strlen(args[i]) + 1; // add 1 for a space
1163 }
1164 char* s = NEW_RESOURCE_ARRAY(char, length);
1165 strcpy(s, args[0]);
1166 for (int j = 1; j < count; j++) {
1167 strcat(s, " ");
1168 strcat(s, args[j]);
1169 }
1170 return (const char*) s;
1171 }
1172
1173 void Arguments::print_on(outputStream* st) {
1174 st->print_cr("VM Arguments:");
1175 if (num_jvm_flags() > 0) {
1176 st->print("jvm_flags: "); print_jvm_flags_on(st);
1177 st->cr();
1178 }
1179 if (num_jvm_args() > 0) {
1180 st->print("jvm_args: "); print_jvm_args_on(st);
1181 st->cr();
1182 }
1183 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1184 if (_java_class_path != NULL) {
1185 char* path = _java_class_path->value();
1186 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1187 }
1188 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1189 }
1190
1191 void Arguments::print_summary_on(outputStream* st) {
1192 // Print the command line. Environment variables that are helpful for
1193 // reproducing the problem are written later in the hs_err file.
1194 // flags are from setting file
1195 if (num_jvm_flags() > 0) {
1196 st->print_raw("Settings File: ");
1197 print_jvm_flags_on(st);
1198 st->cr();
1199 }
1200 // args are the command line and environment variable arguments.
1201 st->print_raw("Command Line: ");
1202 if (num_jvm_args() > 0) {
1203 print_jvm_args_on(st);
1204 }
1205 // this is the classfile and any arguments to the java program
1206 if (java_command() != NULL) {
1207 st->print("%s", java_command());
1208 }
1209 st->cr();
1210 }
1211
1212 void Arguments::print_jvm_flags_on(outputStream* st) {
1213 if (_num_jvm_flags > 0) {
1214 for (int i=0; i < _num_jvm_flags; i++) {
1215 st->print("%s ", _jvm_flags_array[i]);
1216 }
1217 }
1218 }
1219
1220 void Arguments::print_jvm_args_on(outputStream* st) {
1221 if (_num_jvm_args > 0) {
1222 for (int i=0; i < _num_jvm_args; i++) {
1223 st->print("%s ", _jvm_args_array[i]);
1224 }
1225 }
1226 }
1227
1228 bool Arguments::process_argument(const char* arg,
1229 jboolean ignore_unrecognized,
1230 Flag::Flags origin) {
1231 JDK_Version since = JDK_Version();
1232
1233 if (parse_argument(arg, origin)) {
1234 return true;
1235 }
1236
1237 // Determine if the flag has '+', '-', or '=' characters.
1238 bool has_plus_minus = (*arg == '+' || *arg == '-');
1239 const char* const argname = has_plus_minus ? arg + 1 : arg;
1240
1241 size_t arg_len;
1242 const char* equal_sign = strchr(argname, '=');
1243 if (equal_sign == NULL) {
1244 arg_len = strlen(argname);
1245 } else {
1246 arg_len = equal_sign - argname;
1247 }
1248
1249 // Only make the obsolete check for valid arguments.
1250 if (arg_len <= BUFLEN) {
1251 // Construct a string which consists only of the argument name without '+', '-', or '='.
1252 char stripped_argname[BUFLEN+1];
1253 strncpy(stripped_argname, argname, arg_len);
1254 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate.
1255 if (is_obsolete_flag(stripped_argname, &since)) {
1256 char version[256];
1257 since.to_string(version, sizeof(version));
1258 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1259 return true;
1260 }
1261 #ifndef PRODUCT
1262 else {
1263 const char* replacement;
1264 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1265 log_warning(arguments)("%s has been removed. Please use %s instead.",
1266 stripped_argname,
1267 replacement);
1268 return false;
1269 }
1270 }
1271 #endif //PRODUCT
1272 }
1273
1274 // For locked flags, report a custom error message if available.
1275 // Otherwise, report the standard unrecognized VM option.
1276 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1277 if (found_flag != NULL) {
1278 char locked_message_buf[BUFLEN];
1279 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1280 if (strlen(locked_message_buf) == 0) {
1281 if (found_flag->is_bool() && !has_plus_minus) {
1282 jio_fprintf(defaultStream::error_stream(),
1283 "Missing +/- setting for VM option '%s'\n", argname);
1284 } else if (!found_flag->is_bool() && has_plus_minus) {
1285 jio_fprintf(defaultStream::error_stream(),
1286 "Unexpected +/- setting in VM option '%s'\n", argname);
1287 } else {
1288 jio_fprintf(defaultStream::error_stream(),
1289 "Improperly specified VM option '%s'\n", argname);
1290 }
1291 } else {
1292 #ifdef PRODUCT
1293 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1294 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1295 if (ignore_unrecognized && mismatched) {
1296 return true;
1297 }
1298 #endif
1299 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1300 }
1301 } else {
1302 if (ignore_unrecognized) {
1303 return true;
1304 }
1305 jio_fprintf(defaultStream::error_stream(),
1306 "Unrecognized VM option '%s'\n", argname);
1307 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1308 if (fuzzy_matched != NULL) {
1309 jio_fprintf(defaultStream::error_stream(),
1310 "Did you mean '%s%s%s'? ",
1311 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1312 fuzzy_matched->_name,
1313 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1314 }
1315 }
1316
1317 // allow for commandline "commenting out" options like -XX:#+Verbose
1318 return arg[0] == '#';
1319 }
1320
1321 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1322 FILE* stream = fopen(file_name, "rb");
1323 if (stream == NULL) {
1324 if (should_exist) {
1325 jio_fprintf(defaultStream::error_stream(),
1326 "Could not open settings file %s\n", file_name);
1327 return false;
1328 } else {
1329 return true;
1330 }
1331 }
1332
1333 char token[1024];
1334 int pos = 0;
1335
1336 bool in_white_space = true;
1337 bool in_comment = false;
1338 bool in_quote = false;
1339 char quote_c = 0;
1340 bool result = true;
1341
1342 int c = getc(stream);
1343 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1344 if (in_white_space) {
1345 if (in_comment) {
1346 if (c == '\n') in_comment = false;
1347 } else {
1348 if (c == '#') in_comment = true;
1349 else if (!isspace(c)) {
1350 in_white_space = false;
1351 token[pos++] = c;
1352 }
1353 }
1354 } else {
1355 if (c == '\n' || (!in_quote && isspace(c))) {
1356 // token ends at newline, or at unquoted whitespace
1357 // this allows a way to include spaces in string-valued options
1358 token[pos] = '\0';
1359 logOption(token);
1360 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1361 build_jvm_flags(token);
1362 pos = 0;
1363 in_white_space = true;
1364 in_quote = false;
1365 } else if (!in_quote && (c == '\'' || c == '"')) {
1366 in_quote = true;
1367 quote_c = c;
1368 } else if (in_quote && (c == quote_c)) {
1369 in_quote = false;
1370 } else {
1371 token[pos++] = c;
1372 }
1373 }
1374 c = getc(stream);
1375 }
1376 if (pos > 0) {
1377 token[pos] = '\0';
1378 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1379 build_jvm_flags(token);
1380 }
1381 fclose(stream);
1382 return result;
1383 }
1384
1385 //=============================================================================================================
1386 // Parsing of properties (-D)
1387
1388 const char* Arguments::get_property(const char* key) {
1389 return PropertyList_get_value(system_properties(), key);
1390 }
1391
1392 bool Arguments::add_property(const char* prop) {
1393 const char* eq = strchr(prop, '=');
1394 const char* key;
1395 const char* value = "";
1396
1397 if (eq == NULL) {
1398 // property doesn't have a value, thus use passed string
1399 key = prop;
1400 } else {
1401 // property have a value, thus extract it and save to the
1402 // allocated string
1403 size_t key_len = eq - prop;
1404 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1405
1406 strncpy(tmp_key, prop, key_len);
1407 tmp_key[key_len] = '\0';
1408 key = tmp_key;
1409
1410 value = &prop[key_len + 1];
1411 }
1412
1413 if (strcmp(key, "java.compiler") == 0) {
1414 process_java_compiler_argument(value);
1415 // Record value in Arguments, but let it get passed to Java.
1416 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1417 strcmp(key, "sun.java.launcher.pid") == 0) {
1418 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1419 // private and are processed in process_sun_java_launcher_properties();
1420 // the sun.java.launcher property is passed on to the java application
1421 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1422 PropertyList_unique_add(&_system_properties, key, value, true);
1423 } else {
1424 if (strcmp(key, "sun.java.command") == 0) {
1425 char *old_java_command = _java_command;
1426 _java_command = os::strdup_check_oom(value, mtArguments);
1427 if (old_java_command != NULL) {
1428 os::free(old_java_command);
1429 }
1430 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1431 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1432 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1433 // its value without going through the property list or making a Java call.
1434 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1435 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1436 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1437 os::free((void *)old_java_vendor_url_bug);
1438 }
1439 }
1440
1441 // Create new property and add at the end of the list
1442 PropertyList_unique_add(&_system_properties, key, value);
1443 }
1444
1445 if (key != prop) {
1446 // SystemProperty copy passed value, thus free previously allocated
1447 // memory
1448 FreeHeap((void *)key);
1449 }
1450
1451 return true;
1452 }
1453
1454 // sets or adds a module name to the jdk.launcher.addmods property
1455 bool Arguments::append_to_addmods_property(const char* module_name) {
1456 const char* key = "jdk.launcher.addmods";
1457 const char* old_value = Arguments::get_property(key);
1458 size_t buf_len = strlen(key) + strlen(module_name) + 2;
1459 if (old_value != NULL) {
1460 buf_len += strlen(old_value) + 1;
1461 }
1462 char* new_value = AllocateHeap(buf_len, mtArguments);
1463 if (new_value == NULL) {
1464 return false;
1465 }
1466 if (old_value == NULL) {
1467 jio_snprintf(new_value, buf_len, "%s=%s", key, module_name);
1468 } else {
1469 jio_snprintf(new_value, buf_len, "%s=%s,%s", key, old_value, module_name);
1470 }
1471 bool added = add_property(new_value);
1472 FreeHeap(new_value);
1473 return added;
1474 }
1475
1476 #if INCLUDE_CDS
1477 void Arguments::check_unsupported_dumping_properties() {
1478 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1479 const char* unsupported_properties[5] = { "jdk.module.main",
1480 "jdk.module.path",
1481 "jdk.upgrade.module.path",
1482 "jdk.launcher.addmods",
1483 "jdk.launcher.limitmods" };
1484 const char* unsupported_options[5] = { "-m",
1485 "-modulepath",
1486 "-upgrademodulepath",
1487 "-addmods",
1488 "-limitmods" };
1489 SystemProperty* sp = system_properties();
1490 while (sp != NULL) {
1491 for (int i = 0; i < 5; i++) {
1492 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1493 vm_exit_during_initialization(
1494 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1495 }
1496 }
1497 sp = sp->next();
1498 }
1499 }
1500 #endif
1501
1502 //===========================================================================================================
1503 // Setting int/mixed/comp mode flags
1504
1505 void Arguments::set_mode_flags(Mode mode) {
1506 // Set up default values for all flags.
1507 // If you add a flag to any of the branches below,
1508 // add a default value for it here.
1509 set_java_compiler(false);
1510 _mode = mode;
1511
1512 // Ensure Agent_OnLoad has the correct initial values.
1513 // This may not be the final mode; mode may change later in onload phase.
1514 PropertyList_unique_add(&_system_properties, "java.vm.info",
1515 VM_Version::vm_info_string(), false);
1516
1517 UseInterpreter = true;
1518 UseCompiler = true;
1519 UseLoopCounter = true;
1520
1521 // Default values may be platform/compiler dependent -
1522 // use the saved values
1523 ClipInlining = Arguments::_ClipInlining;
1524 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1525 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1526 BackgroundCompilation = Arguments::_BackgroundCompilation;
1527 if (TieredCompilation) {
1528 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1529 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1530 }
1531 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1532 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1533 }
1534 }
1535
1536 // Change from defaults based on mode
1537 switch (mode) {
1538 default:
1539 ShouldNotReachHere();
1540 break;
1541 case _int:
1542 UseCompiler = false;
1543 UseLoopCounter = false;
1544 AlwaysCompileLoopMethods = false;
1545 UseOnStackReplacement = false;
1546 break;
1547 case _mixed:
1548 // same as default
1549 break;
1550 case _comp:
1551 UseInterpreter = false;
1552 BackgroundCompilation = false;
1553 ClipInlining = false;
1554 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1555 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1556 // compile a level 4 (C2) and then continue executing it.
1557 if (TieredCompilation) {
1558 Tier3InvokeNotifyFreqLog = 0;
1559 Tier4InvocationThreshold = 0;
1560 }
1561 break;
1562 }
1563 }
1564
1565 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS
1566 // Conflict: required to use shared spaces (-Xshare:on), but
1567 // incompatible command line options were chosen.
1568
1569 static void no_shared_spaces(const char* message) {
1570 if (RequireSharedSpaces) {
1571 jio_fprintf(defaultStream::error_stream(),
1572 "Class data sharing is inconsistent with other specified options.\n");
1573 vm_exit_during_initialization("Unable to use shared archive.", message);
1574 } else {
1575 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1576 }
1577 }
1578 #endif
1579
1580 // Returns threshold scaled with the value of scale.
1581 // If scale < 0.0, threshold is returned without scaling.
1582 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1583 if (scale == 1.0 || scale < 0.0) {
1584 return threshold;
1585 } else {
1586 return (intx)(threshold * scale);
1587 }
1588 }
1589
1590 // Returns freq_log scaled with the value of scale.
1591 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1592 // If scale < 0.0, freq_log is returned without scaling.
1593 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1594 // Check if scaling is necessary or if negative value was specified.
1595 if (scale == 1.0 || scale < 0.0) {
1596 return freq_log;
1597 }
1598 // Check values to avoid calculating log2 of 0.
1599 if (scale == 0.0 || freq_log == 0) {
1600 return 0;
1601 }
1602 // Determine the maximum notification frequency value currently supported.
1603 // The largest mask value that the interpreter/C1 can handle is
1604 // of length InvocationCounter::number_of_count_bits. Mask values are always
1605 // one bit shorter then the value of the notification frequency. Set
1606 // max_freq_bits accordingly.
1607 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1608 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1609 if (scaled_freq == 0) {
1610 // Return 0 right away to avoid calculating log2 of 0.
1611 return 0;
1612 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1613 return max_freq_bits;
1614 } else {
1615 return log2_intptr(scaled_freq);
1616 }
1617 }
1618
1619 void Arguments::set_tiered_flags() {
1620 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1621 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1622 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1623 }
1624 if (CompilationPolicyChoice < 2) {
1625 vm_exit_during_initialization(
1626 "Incompatible compilation policy selected", NULL);
1627 }
1628 // Increase the code cache size - tiered compiles a lot more.
1629 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1630 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1631 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1632 }
1633 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1634 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1635 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1636 }
1637 if (!UseInterpreter) { // -Xcomp
1638 Tier3InvokeNotifyFreqLog = 0;
1639 Tier4InvocationThreshold = 0;
1640 }
1641
1642 if (CompileThresholdScaling < 0) {
1643 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1644 }
1645
1646 // Scale tiered compilation thresholds.
1647 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1648 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1649 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1650 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1651
1652 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1653 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1654 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1655 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1656
1657 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1658 // once these thresholds become supported.
1659
1660 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1661 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1662
1663 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1664 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1665
1666 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1667
1668 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1669 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1670 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1671 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1672 }
1673 }
1674
1675 #if INCLUDE_ALL_GCS
1676 static void disable_adaptive_size_policy(const char* collector_name) {
1677 if (UseAdaptiveSizePolicy) {
1678 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1679 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1680 collector_name);
1681 }
1682 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1683 }
1684 }
1685
1686 void Arguments::set_parnew_gc_flags() {
1687 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1688 "control point invariant");
1689 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1690 assert(UseParNewGC, "ParNew should always be used with CMS");
1691
1692 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1693 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1694 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1695 } else if (ParallelGCThreads == 0) {
1696 jio_fprintf(defaultStream::error_stream(),
1697 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1698 vm_exit(1);
1699 }
1700
1701 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1702 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1703 // we set them to 1024 and 1024.
1704 // See CR 6362902.
1705 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1706 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1707 }
1708 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1709 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1710 }
1711
1712 // When using compressed oops, we use local overflow stacks,
1713 // rather than using a global overflow list chained through
1714 // the klass word of the object's pre-image.
1715 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1716 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1717 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1718 }
1719 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1720 }
1721 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1722 }
1723
1724 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1725 // sparc/solaris for certain applications, but would gain from
1726 // further optimization and tuning efforts, and would almost
1727 // certainly gain from analysis of platform and environment.
1728 void Arguments::set_cms_and_parnew_gc_flags() {
1729 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1730 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1731 assert(UseParNewGC, "ParNew should always be used with CMS");
1732
1733 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1734 disable_adaptive_size_policy("UseConcMarkSweepGC");
1735
1736 set_parnew_gc_flags();
1737
1738 size_t max_heap = align_size_down(MaxHeapSize,
1739 CardTableRS::ct_max_alignment_constraint());
1740
1741 // Now make adjustments for CMS
1742 intx tenuring_default = (intx)6;
1743 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1744
1745 // Preferred young gen size for "short" pauses:
1746 // upper bound depends on # of threads and NewRatio.
1747 const size_t preferred_max_new_size_unaligned =
1748 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1749 size_t preferred_max_new_size =
1750 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1751
1752 // Unless explicitly requested otherwise, size young gen
1753 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1754
1755 // If either MaxNewSize or NewRatio is set on the command line,
1756 // assume the user is trying to set the size of the young gen.
1757 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1758
1759 // Set MaxNewSize to our calculated preferred_max_new_size unless
1760 // NewSize was set on the command line and it is larger than
1761 // preferred_max_new_size.
1762 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1763 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1764 } else {
1765 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1766 }
1767 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1768
1769 // Code along this path potentially sets NewSize and OldSize
1770 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1771 min_heap_size(), InitialHeapSize, max_heap);
1772 size_t min_new = preferred_max_new_size;
1773 if (FLAG_IS_CMDLINE(NewSize)) {
1774 min_new = NewSize;
1775 }
1776 if (max_heap > min_new && min_heap_size() > min_new) {
1777 // Unless explicitly requested otherwise, make young gen
1778 // at least min_new, and at most preferred_max_new_size.
1779 if (FLAG_IS_DEFAULT(NewSize)) {
1780 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1781 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1782 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1783 }
1784 // Unless explicitly requested otherwise, size old gen
1785 // so it's NewRatio x of NewSize.
1786 if (FLAG_IS_DEFAULT(OldSize)) {
1787 if (max_heap > NewSize) {
1788 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1789 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1790 }
1791 }
1792 }
1793 }
1794 // Unless explicitly requested otherwise, definitely
1795 // promote all objects surviving "tenuring_default" scavenges.
1796 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1797 FLAG_IS_DEFAULT(SurvivorRatio)) {
1798 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1799 }
1800 // If we decided above (or user explicitly requested)
1801 // `promote all' (via MaxTenuringThreshold := 0),
1802 // prefer minuscule survivor spaces so as not to waste
1803 // space for (non-existent) survivors
1804 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1805 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1806 }
1807
1808 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1809 // but rather the number of free blocks of a given size that are used when
1810 // replenishing the local per-worker free list caches.
1811 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1812 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1813 // OldPLAB sizing manually turned off: Use a larger default setting,
1814 // unless it was manually specified. This is because a too-low value
1815 // will slow down scavenges.
1816 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1817 } else {
1818 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1819 }
1820 }
1821
1822 // If either of the static initialization defaults have changed, note this
1823 // modification.
1824 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1825 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1826 }
1827
1828 if (!ClassUnloading) {
1829 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1830 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1831 }
1832
1833 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1834 log_trace(gc)("ConcGCThreads: %u", ConcGCThreads);
1835 }
1836 #endif // INCLUDE_ALL_GCS
1837
1838 void set_object_alignment() {
1839 // Object alignment.
1840 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1841 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1842 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1843 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1844 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1845 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1846
1847 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1848 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1849
1850 // Oop encoding heap max
1851 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1852
1853 if (SurvivorAlignmentInBytes == 0) {
1854 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1855 }
1856
1857 #if INCLUDE_ALL_GCS
1858 // Set CMS global values
1859 CompactibleFreeListSpace::set_cms_values();
1860 #endif // INCLUDE_ALL_GCS
1861 }
1862
1863 size_t Arguments::max_heap_for_compressed_oops() {
1864 // Avoid sign flip.
1865 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1866 // We need to fit both the NULL page and the heap into the memory budget, while
1867 // keeping alignment constraints of the heap. To guarantee the latter, as the
1868 // NULL page is located before the heap, we pad the NULL page to the conservative
1869 // maximum alignment that the GC may ever impose upon the heap.
1870 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1871 _conservative_max_heap_alignment);
1872
1873 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1874 NOT_LP64(ShouldNotReachHere(); return 0);
1875 }
1876
1877 bool Arguments::should_auto_select_low_pause_collector() {
1878 if (UseAutoGCSelectPolicy &&
1879 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1880 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1881 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1882 return true;
1883 }
1884 return false;
1885 }
1886
1887 void Arguments::set_use_compressed_oops() {
1888 #ifndef ZERO
1889 #ifdef _LP64
1890 // MaxHeapSize is not set up properly at this point, but
1891 // the only value that can override MaxHeapSize if we are
1892 // to use UseCompressedOops is InitialHeapSize.
1893 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1894
1895 if (max_heap_size <= max_heap_for_compressed_oops()) {
1896 #if !defined(COMPILER1) || defined(TIERED)
1897 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1898 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1899 }
1900 #endif
1901 } else {
1902 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1903 warning("Max heap size too large for Compressed Oops");
1904 FLAG_SET_DEFAULT(UseCompressedOops, false);
1905 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1906 }
1907 }
1908 #endif // _LP64
1909 #endif // ZERO
1910 }
1911
1912
1913 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1914 // set_use_compressed_oops().
1915 void Arguments::set_use_compressed_klass_ptrs() {
1916 #ifndef ZERO
1917 #ifdef _LP64
1918 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1919 if (!UseCompressedOops) {
1920 if (UseCompressedClassPointers) {
1921 warning("UseCompressedClassPointers requires UseCompressedOops");
1922 }
1923 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1924 } else {
1925 // Turn on UseCompressedClassPointers too
1926 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1927 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1928 }
1929 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1930 if (UseCompressedClassPointers) {
1931 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1932 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1933 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1934 }
1935 }
1936 }
1937 #endif // _LP64
1938 #endif // !ZERO
1939 }
1940
1941 void Arguments::set_conservative_max_heap_alignment() {
1942 // The conservative maximum required alignment for the heap is the maximum of
1943 // the alignments imposed by several sources: any requirements from the heap
1944 // itself, the collector policy and the maximum page size we may run the VM
1945 // with.
1946 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1947 #if INCLUDE_ALL_GCS
1948 if (UseParallelGC) {
1949 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1950 } else if (UseG1GC) {
1951 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1952 }
1953 #endif // INCLUDE_ALL_GCS
1954 _conservative_max_heap_alignment = MAX4(heap_alignment,
1955 (size_t)os::vm_allocation_granularity(),
1956 os::max_page_size(),
1957 CollectorPolicy::compute_heap_alignment());
1958 }
1959
1960 bool Arguments::gc_selected() {
1961 #if INCLUDE_ALL_GCS
1962 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC;
1963 #else
1964 return UseSerialGC;
1965 #endif // INCLUDE_ALL_GCS
1966 }
1967
1968 void Arguments::select_gc_ergonomically() {
1969 #if INCLUDE_ALL_GCS
1970 if (os::is_server_class_machine()) {
1971 if (should_auto_select_low_pause_collector()) {
1972 FLAG_SET_ERGO_IF_DEFAULT(bool, UseConcMarkSweepGC, true);
1973 } else {
1974 #if defined(JAVASE_EMBEDDED)
1975 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParallelGC, true);
1976 #else
1977 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
1978 #endif
1979 }
1980 } else {
1981 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1982 }
1983 #else
1984 UNSUPPORTED_OPTION(UseG1GC);
1985 UNSUPPORTED_OPTION(UseParallelGC);
1986 UNSUPPORTED_OPTION(UseParallelOldGC);
1987 UNSUPPORTED_OPTION(UseConcMarkSweepGC);
1988 UNSUPPORTED_OPTION(UseParNewGC);
1989 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1990 #endif // INCLUDE_ALL_GCS
1991 }
1992
1993 void Arguments::select_gc() {
1994 if (!gc_selected()) {
1995 select_gc_ergonomically();
1996 if (!gc_selected()) {
1997 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL);
1998 }
1999 }
2000 }
2001
2002 void Arguments::set_ergonomics_flags() {
2003 select_gc();
2004
2005 #if defined(COMPILER2) || INCLUDE_JVMCI
2006 // Shared spaces work fine with other GCs but causes bytecode rewriting
2007 // to be disabled, which hurts interpreter performance and decreases
2008 // server performance. When -server is specified, keep the default off
2009 // unless it is asked for. Future work: either add bytecode rewriting
2010 // at link time, or rewrite bytecodes in non-shared methods.
2011 if (!DumpSharedSpaces && !RequireSharedSpaces &&
2012 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
2013 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
2014 }
2015 #endif
2016
2017 set_conservative_max_heap_alignment();
2018
2019 #ifndef ZERO
2020 #ifdef _LP64
2021 set_use_compressed_oops();
2022
2023 // set_use_compressed_klass_ptrs() must be called after calling
2024 // set_use_compressed_oops().
2025 set_use_compressed_klass_ptrs();
2026
2027 // Also checks that certain machines are slower with compressed oops
2028 // in vm_version initialization code.
2029 #endif // _LP64
2030 #endif // !ZERO
2031
2032 CodeCacheExtensions::set_ergonomics_flags();
2033 }
2034
2035 void Arguments::set_parallel_gc_flags() {
2036 assert(UseParallelGC || UseParallelOldGC, "Error");
2037 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
2038 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
2039 FLAG_SET_DEFAULT(UseParallelOldGC, true);
2040 }
2041 FLAG_SET_DEFAULT(UseParallelGC, true);
2042
2043 // If no heap maximum was requested explicitly, use some reasonable fraction
2044 // of the physical memory, up to a maximum of 1GB.
2045 FLAG_SET_DEFAULT(ParallelGCThreads,
2046 Abstract_VM_Version::parallel_worker_threads());
2047 if (ParallelGCThreads == 0) {
2048 jio_fprintf(defaultStream::error_stream(),
2049 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
2050 vm_exit(1);
2051 }
2052
2053 if (UseAdaptiveSizePolicy) {
2054 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
2055 // unless the user actually sets these flags.
2056 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
2057 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
2058 }
2059 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
2060 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
2061 }
2062 }
2063
2064 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
2065 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
2066 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
2067 // See CR 6362902 for details.
2068 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
2069 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
2070 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
2071 }
2072 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
2073 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
2074 }
2075 }
2076
2077 if (UseParallelOldGC) {
2078 // Par compact uses lower default values since they are treated as
2079 // minimums. These are different defaults because of the different
2080 // interpretation and are not ergonomically set.
2081 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
2082 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
2083 }
2084 }
2085 }
2086
2087 void Arguments::set_g1_gc_flags() {
2088 assert(UseG1GC, "Error");
2089 #if defined(COMPILER1) || INCLUDE_JVMCI
2090 FastTLABRefill = false;
2091 #endif
2092 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
2093 if (ParallelGCThreads == 0) {
2094 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
2095 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
2096 }
2097
2098 #if INCLUDE_ALL_GCS
2099 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) {
2100 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads);
2101 }
2102 #endif
2103
2104 // MarkStackSize will be set (if it hasn't been set by the user)
2105 // when concurrent marking is initialized.
2106 // Its value will be based upon the number of parallel marking threads.
2107 // But we do set the maximum mark stack size here.
2108 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
2109 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
2110 }
2111
2112 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
2113 // In G1, we want the default GC overhead goal to be higher than
2114 // it is for PS, or the heap might be expanded too aggressively.
2115 // We set it here to ~8%.
2116 FLAG_SET_DEFAULT(GCTimeRatio, 12);
2117 }
2118
2119 // Below, we might need to calculate the pause time interval based on
2120 // the pause target. When we do so we are going to give G1 maximum
2121 // flexibility and allow it to do pauses when it needs to. So, we'll
2122 // arrange that the pause interval to be pause time target + 1 to
2123 // ensure that a) the pause time target is maximized with respect to
2124 // the pause interval and b) we maintain the invariant that pause
2125 // time target < pause interval. If the user does not want this
2126 // maximum flexibility, they will have to set the pause interval
2127 // explicitly.
2128
2129 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
2130 // The default pause time target in G1 is 200ms
2131 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
2132 }
2133
2134 // Then, if the interval parameter was not set, set it according to
2135 // the pause time target (this will also deal with the case when the
2136 // pause time target is the default value).
2137 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
2138 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
2139 }
2140
2141 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
2142 log_trace(gc)("ConcGCThreads: %u", ConcGCThreads);
2143 }
2144
2145 void Arguments::set_gc_specific_flags() {
2146 #if INCLUDE_ALL_GCS
2147 // Set per-collector flags
2148 if (UseParallelGC || UseParallelOldGC) {
2149 set_parallel_gc_flags();
2150 } else if (UseConcMarkSweepGC) {
2151 set_cms_and_parnew_gc_flags();
2152 } else if (UseG1GC) {
2153 set_g1_gc_flags();
2154 }
2155 if (AssumeMP && !UseSerialGC) {
2156 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
2157 warning("If the number of processors is expected to increase from one, then"
2158 " you should configure the number of parallel GC threads appropriately"
2159 " using -XX:ParallelGCThreads=N");
2160 }
2161 }
2162 if (MinHeapFreeRatio == 100) {
2163 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2164 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
2165 }
2166 #endif // INCLUDE_ALL_GCS
2167 }
2168
2169 julong Arguments::limit_by_allocatable_memory(julong limit) {
2170 julong max_allocatable;
2171 julong result = limit;
2172 if (os::has_allocatable_memory_limit(&max_allocatable)) {
2173 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2174 }
2175 return result;
2176 }
2177
2178 // Use static initialization to get the default before parsing
2179 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2180
2181 void Arguments::set_heap_size() {
2182 const julong phys_mem =
2183 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2184 : (julong)MaxRAM;
2185
2186 // If the maximum heap size has not been set with -Xmx,
2187 // then set it as fraction of the size of physical memory,
2188 // respecting the maximum and minimum sizes of the heap.
2189 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2190 julong reasonable_max = phys_mem / MaxRAMFraction;
2191
2192 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2193 // Small physical memory, so use a minimum fraction of it for the heap
2194 reasonable_max = phys_mem / MinRAMFraction;
2195 } else {
2196 // Not-small physical memory, so require a heap at least
2197 // as large as MaxHeapSize
2198 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2199 }
2200 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2201 // Limit the heap size to ErgoHeapSizeLimit
2202 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2203 }
2204 if (UseCompressedOops) {
2205 // Limit the heap size to the maximum possible when using compressed oops
2206 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2207
2208 // HeapBaseMinAddress can be greater than default but not less than.
2209 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2210 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2211 // matches compressed oops printing flags
2212 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
2213 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
2214 DefaultHeapBaseMinAddress,
2215 DefaultHeapBaseMinAddress/G,
2216 HeapBaseMinAddress);
2217 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2218 }
2219 }
2220
2221 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2222 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2223 // but it should be not less than default MaxHeapSize.
2224 max_coop_heap -= HeapBaseMinAddress;
2225 }
2226 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2227 }
2228 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2229
2230 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2231 // An initial heap size was specified on the command line,
2232 // so be sure that the maximum size is consistent. Done
2233 // after call to limit_by_allocatable_memory because that
2234 // method might reduce the allocation size.
2235 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2236 }
2237
2238 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2239 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2240 }
2241
2242 // If the minimum or initial heap_size have not been set or requested to be set
2243 // ergonomically, set them accordingly.
2244 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2245 julong reasonable_minimum = (julong)(OldSize + NewSize);
2246
2247 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2248
2249 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2250
2251 if (InitialHeapSize == 0) {
2252 julong reasonable_initial = phys_mem / InitialRAMFraction;
2253
2254 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2255 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2256
2257 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2258
2259 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2260 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2261 }
2262 // If the minimum heap size has not been set (via -Xms),
2263 // synchronize with InitialHeapSize to avoid errors with the default value.
2264 if (min_heap_size() == 0) {
2265 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2266 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2267 }
2268 }
2269 }
2270
2271 // This option inspects the machine and attempts to set various
2272 // parameters to be optimal for long-running, memory allocation
2273 // intensive jobs. It is intended for machines with large
2274 // amounts of cpu and memory.
2275 jint Arguments::set_aggressive_heap_flags() {
2276 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2277 // VM, but we may not be able to represent the total physical memory
2278 // available (like having 8gb of memory on a box but using a 32bit VM).
2279 // Thus, we need to make sure we're using a julong for intermediate
2280 // calculations.
2281 julong initHeapSize;
2282 julong total_memory = os::physical_memory();
2283
2284 if (total_memory < (julong) 256 * M) {
2285 jio_fprintf(defaultStream::error_stream(),
2286 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2287 vm_exit(1);
2288 }
2289
2290 // The heap size is half of available memory, or (at most)
2291 // all of possible memory less 160mb (leaving room for the OS
2292 // when using ISM). This is the maximum; because adaptive sizing
2293 // is turned on below, the actual space used may be smaller.
2294
2295 initHeapSize = MIN2(total_memory / (julong) 2,
2296 total_memory - (julong) 160 * M);
2297
2298 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2299
2300 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2301 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2302 return JNI_EINVAL;
2303 }
2304 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2305 return JNI_EINVAL;
2306 }
2307 // Currently the minimum size and the initial heap sizes are the same.
2308 set_min_heap_size(initHeapSize);
2309 }
2310 if (FLAG_IS_DEFAULT(NewSize)) {
2311 // Make the young generation 3/8ths of the total heap.
2312 if (FLAG_SET_CMDLINE(size_t, NewSize,
2313 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2314 return JNI_EINVAL;
2315 }
2316 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2317 return JNI_EINVAL;
2318 }
2319 }
2320
2321 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2322 FLAG_SET_DEFAULT(UseLargePages, true);
2323 #endif
2324
2325 // Increase some data structure sizes for efficiency
2326 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2327 return JNI_EINVAL;
2328 }
2329 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2330 return JNI_EINVAL;
2331 }
2332 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2333 return JNI_EINVAL;
2334 }
2335
2336 // See the OldPLABSize comment below, but replace 'after promotion'
2337 // with 'after copying'. YoungPLABSize is the size of the survivor
2338 // space per-gc-thread buffers. The default is 4kw.
2339 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2340 return JNI_EINVAL;
2341 }
2342
2343 // OldPLABSize is the size of the buffers in the old gen that
2344 // UseParallelGC uses to promote live data that doesn't fit in the
2345 // survivor spaces. At any given time, there's one for each gc thread.
2346 // The default size is 1kw. These buffers are rarely used, since the
2347 // survivor spaces are usually big enough. For specjbb, however, there
2348 // are occasions when there's lots of live data in the young gen
2349 // and we end up promoting some of it. We don't have a definite
2350 // explanation for why bumping OldPLABSize helps, but the theory
2351 // is that a bigger PLAB results in retaining something like the
2352 // original allocation order after promotion, which improves mutator
2353 // locality. A minor effect may be that larger PLABs reduce the
2354 // number of PLAB allocation events during gc. The value of 8kw
2355 // was arrived at by experimenting with specjbb.
2356 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2357 return JNI_EINVAL;
2358 }
2359
2360 // Enable parallel GC and adaptive generation sizing
2361 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2362 return JNI_EINVAL;
2363 }
2364 FLAG_SET_DEFAULT(ParallelGCThreads,
2365 Abstract_VM_Version::parallel_worker_threads());
2366
2367 // Encourage steady state memory management
2368 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2369 return JNI_EINVAL;
2370 }
2371
2372 // This appears to improve mutator locality
2373 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2374 return JNI_EINVAL;
2375 }
2376
2377 // Get around early Solaris scheduling bug
2378 // (affinity vs other jobs on system)
2379 // but disallow DR and offlining (5008695).
2380 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2381 return JNI_EINVAL;
2382 }
2383
2384 return JNI_OK;
2385 }
2386
2387 // This must be called after ergonomics.
2388 void Arguments::set_bytecode_flags() {
2389 if (!RewriteBytecodes) {
2390 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2391 }
2392 }
2393
2394 // Aggressive optimization flags -XX:+AggressiveOpts
2395 jint Arguments::set_aggressive_opts_flags() {
2396 #ifdef COMPILER2
2397 if (AggressiveUnboxing) {
2398 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2399 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2400 } else if (!EliminateAutoBox) {
2401 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2402 AggressiveUnboxing = false;
2403 }
2404 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2405 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2406 } else if (!DoEscapeAnalysis) {
2407 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2408 AggressiveUnboxing = false;
2409 }
2410 }
2411 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2412 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2413 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2414 }
2415 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2416 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2417 }
2418
2419 // Feed the cache size setting into the JDK
2420 char buffer[1024];
2421 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2422 if (!add_property(buffer)) {
2423 return JNI_ENOMEM;
2424 }
2425 }
2426 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2427 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2428 }
2429 #endif
2430
2431 if (AggressiveOpts) {
2432 // Sample flag setting code
2433 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2434 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2435 // }
2436 }
2437
2438 return JNI_OK;
2439 }
2440
2441 //===========================================================================================================
2442 // Parsing of java.compiler property
2443
2444 void Arguments::process_java_compiler_argument(const char* arg) {
2445 // For backwards compatibility, Djava.compiler=NONE or ""
2446 // causes us to switch to -Xint mode UNLESS -Xdebug
2447 // is also specified.
2448 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2449 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2450 }
2451 }
2452
2453 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2454 _sun_java_launcher = os::strdup_check_oom(launcher);
2455 }
2456
2457 bool Arguments::created_by_java_launcher() {
2458 assert(_sun_java_launcher != NULL, "property must have value");
2459 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2460 }
2461
2462 bool Arguments::sun_java_launcher_is_altjvm() {
2463 return _sun_java_launcher_is_altjvm;
2464 }
2465
2466 //===========================================================================================================
2467 // Parsing of main arguments
2468
2469 #if INCLUDE_JVMCI
2470 // Check consistency of jvmci vm argument settings.
2471 bool Arguments::check_jvmci_args_consistency() {
2472 if (!EnableJVMCI && !JVMCIGlobals::check_jvmci_flags_are_consistent()) {
2473 JVMCIGlobals::print_jvmci_args_inconsistency_error_message();
2474 return false;
2475 }
2476 return true;
2477 }
2478 #endif //INCLUDE_JVMCI
2479
2480 // Check consistency of GC selection
2481 bool Arguments::check_gc_consistency() {
2482 // Ensure that the user has not selected conflicting sets
2483 // of collectors.
2484 uint i = 0;
2485 if (UseSerialGC) i++;
2486 if (UseConcMarkSweepGC) i++;
2487 if (UseParallelGC || UseParallelOldGC) i++;
2488 if (UseG1GC) i++;
2489 if (i > 1) {
2490 jio_fprintf(defaultStream::error_stream(),
2491 "Conflicting collector combinations in option list; "
2492 "please refer to the release notes for the combinations "
2493 "allowed\n");
2494 return false;
2495 }
2496
2497 if (UseConcMarkSweepGC && !UseParNewGC) {
2498 jio_fprintf(defaultStream::error_stream(),
2499 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2500 return false;
2501 }
2502
2503 if (UseParNewGC && !UseConcMarkSweepGC) {
2504 jio_fprintf(defaultStream::error_stream(),
2505 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2506 return false;
2507 }
2508
2509 return true;
2510 }
2511
2512 // Check the consistency of vm_init_args
2513 bool Arguments::check_vm_args_consistency() {
2514 // Method for adding checks for flag consistency.
2515 // The intent is to warn the user of all possible conflicts,
2516 // before returning an error.
2517 // Note: Needs platform-dependent factoring.
2518 bool status = true;
2519
2520 if (TLABRefillWasteFraction == 0) {
2521 jio_fprintf(defaultStream::error_stream(),
2522 "TLABRefillWasteFraction should be a denominator, "
2523 "not " SIZE_FORMAT "\n",
2524 TLABRefillWasteFraction);
2525 status = false;
2526 }
2527
2528 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2529 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2530 }
2531
2532 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2533 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2534 }
2535
2536 if (GCTimeLimit == 100) {
2537 // Turn off gc-overhead-limit-exceeded checks
2538 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2539 }
2540
2541 status = status && check_gc_consistency();
2542
2543 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2544 // insists that we hold the requisite locks so that the iteration is
2545 // MT-safe. For the verification at start-up and shut-down, we don't
2546 // yet have a good way of acquiring and releasing these locks,
2547 // which are not visible at the CollectedHeap level. We want to
2548 // be able to acquire these locks and then do the iteration rather
2549 // than just disable the lock verification. This will be fixed under
2550 // bug 4788986.
2551 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2552 if (VerifyDuringStartup) {
2553 warning("Heap verification at start-up disabled "
2554 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2555 VerifyDuringStartup = false; // Disable verification at start-up
2556 }
2557
2558 if (VerifyBeforeExit) {
2559 warning("Heap verification at shutdown disabled "
2560 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2561 VerifyBeforeExit = false; // Disable verification at shutdown
2562 }
2563 }
2564
2565 if (PrintNMTStatistics) {
2566 #if INCLUDE_NMT
2567 if (MemTracker::tracking_level() == NMT_off) {
2568 #endif // INCLUDE_NMT
2569 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2570 PrintNMTStatistics = false;
2571 #if INCLUDE_NMT
2572 }
2573 #endif
2574 }
2575 #if INCLUDE_JVMCI
2576
2577 status = status && check_jvmci_args_consistency();
2578
2579 if (EnableJVMCI) {
2580 if (!ScavengeRootsInCode) {
2581 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2582 ScavengeRootsInCode = 1;
2583 }
2584 if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2585 TypeProfileLevel = 0;
2586 }
2587 if (UseJVMCICompiler) {
2588 if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2589 TypeProfileWidth = 8;
2590 }
2591 }
2592 }
2593 #endif
2594
2595 // Check lower bounds of the code cache
2596 // Template Interpreter code is approximately 3X larger in debug builds.
2597 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2598 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2599 jio_fprintf(defaultStream::error_stream(),
2600 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2601 os::vm_page_size()/K);
2602 status = false;
2603 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2604 jio_fprintf(defaultStream::error_stream(),
2605 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2606 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2607 status = false;
2608 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2609 jio_fprintf(defaultStream::error_stream(),
2610 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2611 min_code_cache_size/K);
2612 status = false;
2613 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2614 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2615 jio_fprintf(defaultStream::error_stream(),
2616 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2617 CODE_CACHE_SIZE_LIMIT/M);
2618 status = false;
2619 } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2620 jio_fprintf(defaultStream::error_stream(),
2621 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2622 min_code_cache_size/K);
2623 status = false;
2624 }
2625
2626 #ifdef _LP64
2627 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2628 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2629 }
2630 #endif
2631
2632 #ifndef SUPPORT_RESERVED_STACK_AREA
2633 if (StackReservedPages != 0) {
2634 FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2635 warning("Reserved Stack Area not supported on this platform");
2636 }
2637 #endif
2638
2639 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2640 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2641 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2642 }
2643 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2644 }
2645 if (UseCompiler && is_interpreter_only()) {
2646 if (!FLAG_IS_DEFAULT(UseCompiler)) {
2647 warning("UseCompiler disabled due to -Xint.");
2648 }
2649 FLAG_SET_CMDLINE(bool, UseCompiler, false);
2650 }
2651 #ifdef COMPILER2
2652 if (PostLoopMultiversioning && !RangeCheckElimination) {
2653 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2654 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2655 }
2656 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2657 }
2658 #endif
2659 return status;
2660 }
2661
2662 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2663 const char* option_type) {
2664 if (ignore) return false;
2665
2666 const char* spacer = " ";
2667 if (option_type == NULL) {
2668 option_type = ++spacer; // Set both to the empty string.
2669 }
2670
2671 if (os::obsolete_option(option)) {
2672 jio_fprintf(defaultStream::error_stream(),
2673 "Obsolete %s%soption: %s\n", option_type, spacer,
2674 option->optionString);
2675 return false;
2676 } else {
2677 jio_fprintf(defaultStream::error_stream(),
2678 "Unrecognized %s%soption: %s\n", option_type, spacer,
2679 option->optionString);
2680 return true;
2681 }
2682 }
2683
2684 static const char* user_assertion_options[] = {
2685 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2686 };
2687
2688 static const char* system_assertion_options[] = {
2689 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2690 };
2691
2692 bool Arguments::parse_uintx(const char* value,
2693 uintx* uintx_arg,
2694 uintx min_size) {
2695
2696 // Check the sign first since atomull() parses only unsigned values.
2697 bool value_is_positive = !(*value == '-');
2698
2699 if (value_is_positive) {
2700 julong n;
2701 bool good_return = atomull(value, &n);
2702 if (good_return) {
2703 bool above_minimum = n >= min_size;
2704 bool value_is_too_large = n > max_uintx;
2705
2706 if (above_minimum && !value_is_too_large) {
2707 *uintx_arg = n;
2708 return true;
2709 }
2710 }
2711 }
2712 return false;
2713 }
2714
2715 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2716 julong* long_arg,
2717 julong min_size) {
2718 if (!atomull(s, long_arg)) return arg_unreadable;
2719 return check_memory_size(*long_arg, min_size);
2720 }
2721
2722 // Parse JavaVMInitArgs structure
2723
2724 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2725 const JavaVMInitArgs *java_options_args,
2726 const JavaVMInitArgs *cmd_line_args) {
2727 // For components of the system classpath.
2728 ArgumentBootClassPath bcp(Arguments::get_sysclasspath());
2729 bool bcp_assembly_required = false;
2730
2731 // Save default settings for some mode flags
2732 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2733 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2734 Arguments::_ClipInlining = ClipInlining;
2735 Arguments::_BackgroundCompilation = BackgroundCompilation;
2736 if (TieredCompilation) {
2737 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2738 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2739 }
2740
2741 // Setup flags for mixed which is the default
2742 set_mode_flags(_mixed);
2743
2744 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2745 // variable (if present).
2746 jint result = parse_each_vm_init_arg(
2747 java_tool_options_args, &bcp, &bcp_assembly_required, Flag::ENVIRON_VAR);
2748 if (result != JNI_OK) {
2749 return result;
2750 }
2751
2752 // Parse args structure generated from the command line flags.
2753 result = parse_each_vm_init_arg(cmd_line_args, &bcp, &bcp_assembly_required,
2754 Flag::COMMAND_LINE);
2755 if (result != JNI_OK) {
2756 return result;
2757 }
2758
2759 // Parse args structure generated from the _JAVA_OPTIONS environment
2760 // variable (if present) (mimics classic VM)
2761 result = parse_each_vm_init_arg(
2762 java_options_args, &bcp, &bcp_assembly_required, Flag::ENVIRON_VAR);
2763 if (result != JNI_OK) {
2764 return result;
2765 }
2766
2767 // Do final processing now that all arguments have been parsed
2768 result = finalize_vm_init_args(&bcp, bcp_assembly_required);
2769 if (result != JNI_OK) {
2770 return result;
2771 }
2772
2773 return JNI_OK;
2774 }
2775
2776 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2777 // represents a valid JDWP agent. is_path==true denotes that we
2778 // are dealing with -agentpath (case where name is a path), otherwise with
2779 // -agentlib
2780 bool valid_jdwp_agent(char *name, bool is_path) {
2781 char *_name;
2782 const char *_jdwp = "jdwp";
2783 size_t _len_jdwp, _len_prefix;
2784
2785 if (is_path) {
2786 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2787 return false;
2788 }
2789
2790 _name++; // skip past last path separator
2791 _len_prefix = strlen(JNI_LIB_PREFIX);
2792
2793 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2794 return false;
2795 }
2796
2797 _name += _len_prefix;
2798 _len_jdwp = strlen(_jdwp);
2799
2800 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2801 _name += _len_jdwp;
2802 }
2803 else {
2804 return false;
2805 }
2806
2807 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2808 return false;
2809 }
2810
2811 return true;
2812 }
2813
2814 if (strcmp(name, _jdwp) == 0) {
2815 return true;
2816 }
2817
2818 return false;
2819 }
2820
2821 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2822 ArgumentBootClassPath* bcp_p,
2823 bool* bcp_assembly_required_p,
2824 Flag::Flags origin) {
2825 // For match_option to return remaining or value part of option string
2826 const char* tail;
2827
2828 // iterate over arguments
2829 for (int index = 0; index < args->nOptions; index++) {
2830 bool is_absolute_path = false; // for -agentpath vs -agentlib
2831
2832 const JavaVMOption* option = args->options + index;
2833
2834 if (!match_option(option, "-Djava.class.path", &tail) &&
2835 !match_option(option, "-Dsun.java.command", &tail) &&
2836 !match_option(option, "-Dsun.java.launcher", &tail)) {
2837
2838 // add all jvm options to the jvm_args string. This string
2839 // is used later to set the java.vm.args PerfData string constant.
2840 // the -Djava.class.path and the -Dsun.java.command options are
2841 // omitted from jvm_args string as each have their own PerfData
2842 // string constant object.
2843 build_jvm_args(option->optionString);
2844 }
2845
2846 // -verbose:[class/gc/jni]
2847 if (match_option(option, "-verbose", &tail)) {
2848 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2849 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2850 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2851 } else if (!strcmp(tail, ":gc")) {
2852 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2853 } else if (!strcmp(tail, ":jni")) {
2854 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2855 return JNI_EINVAL;
2856 }
2857 }
2858 // -da / -ea / -disableassertions / -enableassertions
2859 // These accept an optional class/package name separated by a colon, e.g.,
2860 // -da:java.lang.Thread.
2861 } else if (match_option(option, user_assertion_options, &tail, true)) {
2862 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2863 if (*tail == '\0') {
2864 JavaAssertions::setUserClassDefault(enable);
2865 } else {
2866 assert(*tail == ':', "bogus match by match_option()");
2867 JavaAssertions::addOption(tail + 1, enable);
2868 }
2869 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2870 } else if (match_option(option, system_assertion_options, &tail, false)) {
2871 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2872 JavaAssertions::setSystemClassDefault(enable);
2873 // -bootclasspath:
2874 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2875 jio_fprintf(defaultStream::output_stream(),
2876 "-Xbootclasspath is no longer a supported option.\n");
2877 return JNI_EINVAL;
2878 // -bootclasspath/a:
2879 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2880 bcp_p->add_suffix(tail);
2881 *bcp_assembly_required_p = true;
2882 // -bootclasspath/p:
2883 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2884 jio_fprintf(defaultStream::output_stream(),
2885 "-Xbootclasspath/p is no longer a supported option.\n");
2886 return JNI_EINVAL;
2887 // -Xrun
2888 } else if (match_option(option, "-Xrun", &tail)) {
2889 if (tail != NULL) {
2890 const char* pos = strchr(tail, ':');
2891 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2892 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2893 name[len] = '\0';
2894
2895 char *options = NULL;
2896 if(pos != NULL) {
2897 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2898 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2899 }
2900 #if !INCLUDE_JVMTI
2901 if (strcmp(name, "jdwp") == 0) {
2902 jio_fprintf(defaultStream::error_stream(),
2903 "Debugging agents are not supported in this VM\n");
2904 return JNI_ERR;
2905 }
2906 #endif // !INCLUDE_JVMTI
2907 add_init_library(name, options);
2908 }
2909 // -agentlib and -agentpath
2910 } else if (match_option(option, "-agentlib:", &tail) ||
2911 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2912 if(tail != NULL) {
2913 const char* pos = strchr(tail, '=');
2914 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2915 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2916 name[len] = '\0';
2917
2918 char *options = NULL;
2919 if(pos != NULL) {
2920 options = os::strdup_check_oom(pos + 1, mtArguments);
2921 }
2922 #if !INCLUDE_JVMTI
2923 if (valid_jdwp_agent(name, is_absolute_path)) {
2924 jio_fprintf(defaultStream::error_stream(),
2925 "Debugging agents are not supported in this VM\n");
2926 return JNI_ERR;
2927 }
2928 #endif // !INCLUDE_JVMTI
2929 add_init_agent(name, options, is_absolute_path);
2930 }
2931 // -javaagent
2932 } else if (match_option(option, "-javaagent:", &tail)) {
2933 #if !INCLUDE_JVMTI
2934 jio_fprintf(defaultStream::error_stream(),
2935 "Instrumentation agents are not supported in this VM\n");
2936 return JNI_ERR;
2937 #else
2938 if (tail != NULL) {
2939 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtArguments), tail);
2940 add_init_agent("instrument", options, false);
2941 // java agents need module java.instrument. Also -addmods ALL-SYSTEM because
2942 // the java agent is in the unmamed module of the application class loader
2943 if (!Arguments::append_to_addmods_property("java.instrument,ALL-SYSTEM")) {
2944 return JNI_ENOMEM;
2945 }
2946 }
2947 #endif // !INCLUDE_JVMTI
2948 // -Xnoclassgc
2949 } else if (match_option(option, "-Xnoclassgc")) {
2950 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2951 return JNI_EINVAL;
2952 }
2953 // -Xconcgc
2954 } else if (match_option(option, "-Xconcgc")) {
2955 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2956 return JNI_EINVAL;
2957 }
2958 // -Xnoconcgc
2959 } else if (match_option(option, "-Xnoconcgc")) {
2960 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2961 return JNI_EINVAL;
2962 }
2963 // -Xbatch
2964 } else if (match_option(option, "-Xbatch")) {
2965 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2966 return JNI_EINVAL;
2967 }
2968 // -Xmn for compatibility with other JVM vendors
2969 } else if (match_option(option, "-Xmn", &tail)) {
2970 julong long_initial_young_size = 0;
2971 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2972 if (errcode != arg_in_range) {
2973 jio_fprintf(defaultStream::error_stream(),
2974 "Invalid initial young generation size: %s\n", option->optionString);
2975 describe_range_error(errcode);
2976 return JNI_EINVAL;
2977 }
2978 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2979 return JNI_EINVAL;
2980 }
2981 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2982 return JNI_EINVAL;
2983 }
2984 // -Xms
2985 } else if (match_option(option, "-Xms", &tail)) {
2986 julong long_initial_heap_size = 0;
2987 // an initial heap size of 0 means automatically determine
2988 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2989 if (errcode != arg_in_range) {
2990 jio_fprintf(defaultStream::error_stream(),
2991 "Invalid initial heap size: %s\n", option->optionString);
2992 describe_range_error(errcode);
2993 return JNI_EINVAL;
2994 }
2995 set_min_heap_size((size_t)long_initial_heap_size);
2996 // Currently the minimum size and the initial heap sizes are the same.
2997 // Can be overridden with -XX:InitialHeapSize.
2998 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2999 return JNI_EINVAL;
3000 }
3001 // -Xmx
3002 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
3003 julong long_max_heap_size = 0;
3004 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
3005 if (errcode != arg_in_range) {
3006 jio_fprintf(defaultStream::error_stream(),
3007 "Invalid maximum heap size: %s\n", option->optionString);
3008 describe_range_error(errcode);
3009 return JNI_EINVAL;
3010 }
3011 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
3012 return JNI_EINVAL;
3013 }
3014 // Xmaxf
3015 } else if (match_option(option, "-Xmaxf", &tail)) {
3016 char* err;
3017 int maxf = (int)(strtod(tail, &err) * 100);
3018 if (*err != '\0' || *tail == '\0') {
3019 jio_fprintf(defaultStream::error_stream(),
3020 "Bad max heap free percentage size: %s\n",
3021 option->optionString);
3022 return JNI_EINVAL;
3023 } else {
3024 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
3025 return JNI_EINVAL;
3026 }
3027 }
3028 // Xminf
3029 } else if (match_option(option, "-Xminf", &tail)) {
3030 char* err;
3031 int minf = (int)(strtod(tail, &err) * 100);
3032 if (*err != '\0' || *tail == '\0') {
3033 jio_fprintf(defaultStream::error_stream(),
3034 "Bad min heap free percentage size: %s\n",
3035 option->optionString);
3036 return JNI_EINVAL;
3037 } else {
3038 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
3039 return JNI_EINVAL;
3040 }
3041 }
3042 // -Xss
3043 } else if (match_option(option, "-Xss", &tail)) {
3044 julong long_ThreadStackSize = 0;
3045 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
3046 if (errcode != arg_in_range) {
3047 jio_fprintf(defaultStream::error_stream(),
3048 "Invalid thread stack size: %s\n", option->optionString);
3049 describe_range_error(errcode);
3050 return JNI_EINVAL;
3051 }
3052 // Internally track ThreadStackSize in units of 1024 bytes.
3053 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
3054 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
3055 return JNI_EINVAL;
3056 }
3057 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
3058 } else if (match_option(option, "-Xoss", &tail) ||
3059 match_option(option, "-Xsqnopause") ||
3060 match_option(option, "-Xoptimize") ||
3061 match_option(option, "-Xboundthreads") ||
3062 match_option(option, "-Xusealtsigs")) {
3063 // All these options are deprecated in JDK 9 and will be removed in a future release
3064 char version[256];
3065 JDK_Version::jdk(9).to_string(version, sizeof(version));
3066 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
3067 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3068 julong long_CodeCacheExpansionSize = 0;
3069 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3070 if (errcode != arg_in_range) {
3071 jio_fprintf(defaultStream::error_stream(),
3072 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3073 os::vm_page_size()/K);
3074 return JNI_EINVAL;
3075 }
3076 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
3077 return JNI_EINVAL;
3078 }
3079 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3080 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3081 julong long_ReservedCodeCacheSize = 0;
3082
3083 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3084 if (errcode != arg_in_range) {
3085 jio_fprintf(defaultStream::error_stream(),
3086 "Invalid maximum code cache size: %s.\n", option->optionString);
3087 return JNI_EINVAL;
3088 }
3089 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
3090 return JNI_EINVAL;
3091 }
3092 // -XX:NonNMethodCodeHeapSize=
3093 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
3094 julong long_NonNMethodCodeHeapSize = 0;
3095
3096 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
3097 if (errcode != arg_in_range) {
3098 jio_fprintf(defaultStream::error_stream(),
3099 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3100 return JNI_EINVAL;
3101 }
3102 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
3103 return JNI_EINVAL;
3104 }
3105 // -XX:ProfiledCodeHeapSize=
3106 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3107 julong long_ProfiledCodeHeapSize = 0;
3108
3109 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3110 if (errcode != arg_in_range) {
3111 jio_fprintf(defaultStream::error_stream(),
3112 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3113 return JNI_EINVAL;
3114 }
3115 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
3116 return JNI_EINVAL;
3117 }
3118 // -XX:NonProfiledCodeHeapSizee=
3119 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3120 julong long_NonProfiledCodeHeapSize = 0;
3121
3122 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3123 if (errcode != arg_in_range) {
3124 jio_fprintf(defaultStream::error_stream(),
3125 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3126 return JNI_EINVAL;
3127 }
3128 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
3129 return JNI_EINVAL;
3130 }
3131 // -green
3132 } else if (match_option(option, "-green")) {
3133 jio_fprintf(defaultStream::error_stream(),
3134 "Green threads support not available\n");
3135 return JNI_EINVAL;
3136 // -native
3137 } else if (match_option(option, "-native")) {
3138 // HotSpot always uses native threads, ignore silently for compatibility
3139 // -Xrs
3140 } else if (match_option(option, "-Xrs")) {
3141 // Classic/EVM option, new functionality
3142 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3143 return JNI_EINVAL;
3144 }
3145 // -Xprof
3146 } else if (match_option(option, "-Xprof")) {
3147 #if INCLUDE_FPROF
3148 _has_profile = true;
3149 #else // INCLUDE_FPROF
3150 jio_fprintf(defaultStream::error_stream(),
3151 "Flat profiling is not supported in this VM.\n");
3152 return JNI_ERR;
3153 #endif // INCLUDE_FPROF
3154 // -Xconcurrentio
3155 } else if (match_option(option, "-Xconcurrentio")) {
3156 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3157 return JNI_EINVAL;
3158 }
3159 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3160 return JNI_EINVAL;
3161 }
3162 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3163 return JNI_EINVAL;
3164 }
3165 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3166 return JNI_EINVAL;
3167 }
3168 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
3169 return JNI_EINVAL;
3170 }
3171
3172 // -Xinternalversion
3173 } else if (match_option(option, "-Xinternalversion")) {
3174 jio_fprintf(defaultStream::output_stream(), "%s\n",
3175 VM_Version::internal_vm_info_string());
3176 vm_exit(0);
3177 #ifndef PRODUCT
3178 // -Xprintflags
3179 } else if (match_option(option, "-Xprintflags")) {
3180 CommandLineFlags::printFlags(tty, false);
3181 vm_exit(0);
3182 #endif
3183 // -D
3184 } else if (match_option(option, "-D", &tail)) {
3185 const char* value;
3186 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3187 *value!= '\0' && strcmp(value, "\"\"") != 0) {
3188 // abort if -Djava.endorsed.dirs is set
3189 jio_fprintf(defaultStream::output_stream(),
3190 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3191 "in modular form will be supported via the concept of upgradeable modules.\n", value);
3192 return JNI_EINVAL;
3193 }
3194 if (match_option(option, "-Djava.ext.dirs=", &value) &&
3195 *value != '\0' && strcmp(value, "\"\"") != 0) {
3196 // abort if -Djava.ext.dirs is set
3197 jio_fprintf(defaultStream::output_stream(),
3198 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
3199 return JNI_EINVAL;
3200 }
3201
3202 if (!add_property(tail)) {
3203 return JNI_ENOMEM;
3204 }
3205 // Out of the box management support
3206 if (match_option(option, "-Dcom.sun.management", &tail)) {
3207 #if INCLUDE_MANAGEMENT
3208 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3209 return JNI_EINVAL;
3210 }
3211 // management agent in module java.management
3212 if (!Arguments::append_to_addmods_property("java.management")) {
3213 return JNI_ENOMEM;
3214 }
3215 #else
3216 jio_fprintf(defaultStream::output_stream(),
3217 "-Dcom.sun.management is not supported in this VM.\n");
3218 return JNI_ERR;
3219 #endif
3220 }
3221 if (match_option(option, "-Djdk.launcher.patch.0=", &tail)) {
3222 // -Xpatch
3223 int dir_count;
3224 char** patch_dirs = os::split_path(tail, &dir_count);
3225 if (patch_dirs == NULL) {
3226 jio_fprintf(defaultStream::output_stream(),
3227 "Bad value for -Xpatch.\n");
3228 return JNI_ERR;
3229 }
3230 set_patch_dirs(patch_dirs);
3231 set_patch_dirs_count(dir_count);
3232
3233 // Create a path for each patch dir consisting of dir/java.base.
3234 char file_sep = os::file_separator()[0];
3235 for (int x = 0; x < dir_count; x++) {
3236 // Really shouldn't be NULL, but check can't hurt
3237 if (patch_dirs[x] != NULL) {
3238 size_t len = strlen(patch_dirs[x]);
3239 if (len != 0) { // Ignore empty strings.
3240 len += 11; // file_sep + "java.base" + null terminator.
3241 char* dir = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3242 jio_snprintf(dir, len, "%s%cjava.base", patch_dirs[x], file_sep);
3243
3244 // See if Xpatch module path exists.
3245 struct stat st;
3246 if ((os::stat(dir, &st) == 0)) {
3247 bcp_p->add_prefix(dir);
3248 *bcp_assembly_required_p = true;
3249 }
3250 FREE_C_HEAP_ARRAY(char, dir);
3251 }
3252 }
3253 }
3254 }
3255 // -Xint
3256 } else if (match_option(option, "-Xint")) {
3257 set_mode_flags(_int);
3258 // -Xmixed
3259 } else if (match_option(option, "-Xmixed")) {
3260 set_mode_flags(_mixed);
3261 // -Xcomp
3262 } else if (match_option(option, "-Xcomp")) {
3263 // for testing the compiler; turn off all flags that inhibit compilation
3264 set_mode_flags(_comp);
3265 // -Xshare:dump
3266 } else if (match_option(option, "-Xshare:dump")) {
3267 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3268 return JNI_EINVAL;
3269 }
3270 set_mode_flags(_int); // Prevent compilation, which creates objects
3271 // -Xshare:on
3272 } else if (match_option(option, "-Xshare:on")) {
3273 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3274 return JNI_EINVAL;
3275 }
3276 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3277 return JNI_EINVAL;
3278 }
3279 // -Xshare:auto
3280 } else if (match_option(option, "-Xshare:auto")) {
3281 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3282 return JNI_EINVAL;
3283 }
3284 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3285 return JNI_EINVAL;
3286 }
3287 // -Xshare:off
3288 } else if (match_option(option, "-Xshare:off")) {
3289 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3290 return JNI_EINVAL;
3291 }
3292 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3293 return JNI_EINVAL;
3294 }
3295 // -Xverify
3296 } else if (match_option(option, "-Xverify", &tail)) {
3297 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3298 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3299 return JNI_EINVAL;
3300 }
3301 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3302 return JNI_EINVAL;
3303 }
3304 } else if (strcmp(tail, ":remote") == 0) {
3305 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3306 return JNI_EINVAL;
3307 }
3308 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3309 return JNI_EINVAL;
3310 }
3311 } else if (strcmp(tail, ":none") == 0) {
3312 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3313 return JNI_EINVAL;
3314 }
3315 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3316 return JNI_EINVAL;
3317 }
3318 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3319 return JNI_EINVAL;
3320 }
3321 // -Xdebug
3322 } else if (match_option(option, "-Xdebug")) {
3323 // note this flag has been used, then ignore
3324 set_xdebug_mode(true);
3325 // -Xnoagent
3326 } else if (match_option(option, "-Xnoagent")) {
3327 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3328 } else if (match_option(option, "-Xloggc:", &tail)) {
3329 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3330 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3331 _gc_log_filename = os::strdup_check_oom(tail);
3332 } else if (match_option(option, "-Xlog", &tail)) {
3333 bool ret = false;
3334 if (strcmp(tail, ":help") == 0) {
3335 LogConfiguration::print_command_line_help(defaultStream::output_stream());
3336 vm_exit(0);
3337 } else if (strcmp(tail, ":disable") == 0) {
3338 LogConfiguration::disable_logging();
3339 ret = true;
3340 } else if (*tail == '\0') {
3341 ret = LogConfiguration::parse_command_line_arguments();
3342 assert(ret, "-Xlog without arguments should never fail to parse");
3343 } else if (*tail == ':') {
3344 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3345 }
3346 if (ret == false) {
3347 jio_fprintf(defaultStream::error_stream(),
3348 "Invalid -Xlog option '-Xlog%s'\n",
3349 tail);
3350 return JNI_EINVAL;
3351 }
3352 // JNI hooks
3353 } else if (match_option(option, "-Xcheck", &tail)) {
3354 if (!strcmp(tail, ":jni")) {
3355 #if !INCLUDE_JNI_CHECK
3356 warning("JNI CHECKING is not supported in this VM");
3357 #else
3358 CheckJNICalls = true;
3359 #endif // INCLUDE_JNI_CHECK
3360 } else if (is_bad_option(option, args->ignoreUnrecognized,
3361 "check")) {
3362 return JNI_EINVAL;
3363 }
3364 } else if (match_option(option, "vfprintf")) {
3365 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3366 } else if (match_option(option, "exit")) {
3367 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3368 } else if (match_option(option, "abort")) {
3369 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3370 // -XX:+AggressiveHeap
3371 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3372 jint result = set_aggressive_heap_flags();
3373 if (result != JNI_OK) {
3374 return result;
3375 }
3376 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3377 // and the last option wins.
3378 } else if (match_option(option, "-XX:+NeverTenure")) {
3379 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3380 return JNI_EINVAL;
3381 }
3382 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3383 return JNI_EINVAL;
3384 }
3385 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3386 return JNI_EINVAL;
3387 }
3388 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3389 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3390 return JNI_EINVAL;
3391 }
3392 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3393 return JNI_EINVAL;
3394 }
3395 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3396 return JNI_EINVAL;
3397 }
3398 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3399 uintx max_tenuring_thresh = 0;
3400 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3401 jio_fprintf(defaultStream::error_stream(),
3402 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3403 return JNI_EINVAL;
3404 }
3405
3406 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3407 return JNI_EINVAL;
3408 }
3409
3410 if (MaxTenuringThreshold == 0) {
3411 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3412 return JNI_EINVAL;
3413 }
3414 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3415 return JNI_EINVAL;
3416 }
3417 } else {
3418 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3419 return JNI_EINVAL;
3420 }
3421 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3422 return JNI_EINVAL;
3423 }
3424 }
3425 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3426 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3427 return JNI_EINVAL;
3428 }
3429 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3430 return JNI_EINVAL;
3431 }
3432 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3433 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3434 return JNI_EINVAL;
3435 }
3436 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3437 return JNI_EINVAL;
3438 }
3439 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3440 #if defined(DTRACE_ENABLED)
3441 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3442 return JNI_EINVAL;
3443 }
3444 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3445 return JNI_EINVAL;
3446 }
3447 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3448 return JNI_EINVAL;
3449 }
3450 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3451 return JNI_EINVAL;
3452 }
3453 #else // defined(DTRACE_ENABLED)
3454 jio_fprintf(defaultStream::error_stream(),
3455 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3456 return JNI_EINVAL;
3457 #endif // defined(DTRACE_ENABLED)
3458 #ifdef ASSERT
3459 } else if (match_option(option, "-XX:+FullGCALot")) {
3460 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3461 return JNI_EINVAL;
3462 }
3463 // disable scavenge before parallel mark-compact
3464 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3465 return JNI_EINVAL;
3466 }
3467 #endif
3468 #if !INCLUDE_MANAGEMENT
3469 } else if (match_option(option, "-XX:+ManagementServer")) {
3470 jio_fprintf(defaultStream::error_stream(),
3471 "ManagementServer is not supported in this VM.\n");
3472 return JNI_ERR;
3473 #endif // INCLUDE_MANAGEMENT
3474 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3475 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3476 // already been handled
3477 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3478 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3479 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3480 return JNI_EINVAL;
3481 }
3482 }
3483 // Unknown option
3484 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3485 return JNI_ERR;
3486 }
3487 }
3488
3489 // PrintSharedArchiveAndExit will turn on
3490 // -Xshare:on
3491 // -Xlog:class+path=info
3492 if (PrintSharedArchiveAndExit) {
3493 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3494 return JNI_EINVAL;
3495 }
3496 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3497 return JNI_EINVAL;
3498 }
3499 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3500 }
3501
3502 // Change the default value for flags which have different default values
3503 // when working with older JDKs.
3504 #ifdef LINUX
3505 if (JDK_Version::current().compare_major(6) <= 0 &&
3506 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3507 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3508 }
3509 #endif // LINUX
3510 fix_appclasspath();
3511 return JNI_OK;
3512 }
3513
3514 // Set property jdk.boot.class.path.append to the contents of the bootclasspath
3515 // that follows either the jimage file or exploded module directories. The
3516 // property will contain -Xbootclasspath/a and/or jvmti appended additions.
3517 void Arguments::set_jdkbootclasspath_append() {
3518 char *sysclasspath = get_sysclasspath();
3519 assert(sysclasspath != NULL, "NULL sysclasspath");
3520 int bcp_a_idx = bootclassloader_append_index();
3521 if (bcp_a_idx != -1 && bcp_a_idx < (int)strlen(sysclasspath)) {
3522 _jdk_boot_class_path_append->set_value(sysclasspath + bcp_a_idx);
3523 }
3524 }
3525
3526 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3527 //
3528 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3529 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3530 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3531 // path is treated as the current directory.
3532 //
3533 // This causes problems with CDS, which requires that all directories specified in the classpath
3534 // must be empty. In most cases, applications do NOT want to load classes from the current
3535 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3536 // scripts compatible with CDS.
3537 void Arguments::fix_appclasspath() {
3538 if (IgnoreEmptyClassPaths) {
3539 const char separator = *os::path_separator();
3540 const char* src = _java_class_path->value();
3541
3542 // skip over all the leading empty paths
3543 while (*src == separator) {
3544 src ++;
3545 }
3546
3547 char* copy = os::strdup_check_oom(src, mtArguments);
3548
3549 // trim all trailing empty paths
3550 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3551 *tail = '\0';
3552 }
3553
3554 char from[3] = {separator, separator, '\0'};
3555 char to [2] = {separator, '\0'};
3556 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3557 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3558 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3559 }
3560
3561 _java_class_path->set_writeable_value(copy);
3562 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3563 }
3564 }
3565
3566 static bool has_jar_files(const char* directory) {
3567 DIR* dir = os::opendir(directory);
3568 if (dir == NULL) return false;
3569
3570 struct dirent *entry;
3571 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3572 bool hasJarFile = false;
3573 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3574 const char* name = entry->d_name;
3575 const char* ext = name + strlen(name) - 4;
3576 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3577 }
3578 FREE_C_HEAP_ARRAY(char, dbuf);
3579 os::closedir(dir);
3580 return hasJarFile ;
3581 }
3582
3583 static int check_non_empty_dirs(const char* path) {
3584 const char separator = *os::path_separator();
3585 const char* const end = path + strlen(path);
3586 int nonEmptyDirs = 0;
3587 while (path < end) {
3588 const char* tmp_end = strchr(path, separator);
3589 if (tmp_end == NULL) {
3590 if (has_jar_files(path)) {
3591 nonEmptyDirs++;
3592 jio_fprintf(defaultStream::output_stream(),
3593 "Non-empty directory: %s\n", path);
3594 }
3595 path = end;
3596 } else {
3597 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3598 memcpy(dirpath, path, tmp_end - path);
3599 dirpath[tmp_end - path] = '\0';
3600 if (has_jar_files(dirpath)) {
3601 nonEmptyDirs++;
3602 jio_fprintf(defaultStream::output_stream(),
3603 "Non-empty directory: %s\n", dirpath);
3604 }
3605 FREE_C_HEAP_ARRAY(char, dirpath);
3606 path = tmp_end + 1;
3607 }
3608 }
3609 return nonEmptyDirs;
3610 }
3611
3612 jint Arguments::finalize_vm_init_args(ArgumentBootClassPath* bcp_p, bool bcp_assembly_required) {
3613 // check if the default lib/endorsed directory exists; if so, error
3614 char path[JVM_MAXPATHLEN];
3615 const char* fileSep = os::file_separator();
3616 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3617
3618 if (CheckEndorsedAndExtDirs) {
3619 int nonEmptyDirs = 0;
3620 // check endorsed directory
3621 nonEmptyDirs += check_non_empty_dirs(path);
3622 // check the extension directories
3623 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3624 if (nonEmptyDirs > 0) {
3625 return JNI_ERR;
3626 }
3627 }
3628
3629 DIR* dir = os::opendir(path);
3630 if (dir != NULL) {
3631 jio_fprintf(defaultStream::output_stream(),
3632 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3633 "in modular form will be supported via the concept of upgradeable modules.\n");
3634 os::closedir(dir);
3635 return JNI_ERR;
3636 }
3637
3638 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3639 dir = os::opendir(path);
3640 if (dir != NULL) {
3641 jio_fprintf(defaultStream::output_stream(),
3642 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3643 "Use -classpath instead.\n.");
3644 os::closedir(dir);
3645 return JNI_ERR;
3646 }
3647
3648 if (bcp_assembly_required) {
3649 // Assemble the bootclasspath elements into the final path.
3650 char *combined_path = bcp_p->combined_path();
3651 Arguments::set_sysclasspath(combined_path);
3652 FREE_C_HEAP_ARRAY(char, combined_path);
3653 } else {
3654 // At this point in sysclasspath processing anything
3655 // added would be considered in the boot loader's append path.
3656 // Record this index, including +1 for the file separator character.
3657 Arguments::set_bootclassloader_append_index(((int)strlen(Arguments::get_sysclasspath()))+1);
3658 }
3659
3660 // This must be done after all arguments have been processed.
3661 // java_compiler() true means set to "NONE" or empty.
3662 if (java_compiler() && !xdebug_mode()) {
3663 // For backwards compatibility, we switch to interpreted mode if
3664 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3665 // not specified.
3666 set_mode_flags(_int);
3667 }
3668
3669 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3670 // but like -Xint, leave compilation thresholds unaffected.
3671 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3672 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3673 set_mode_flags(_int);
3674 }
3675
3676 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3677 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3678 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3679 }
3680
3681 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3682 // Don't degrade server performance for footprint
3683 if (FLAG_IS_DEFAULT(UseLargePages) &&
3684 MaxHeapSize < LargePageHeapSizeThreshold) {
3685 // No need for large granularity pages w/small heaps.
3686 // Note that large pages are enabled/disabled for both the
3687 // Java heap and the code cache.
3688 FLAG_SET_DEFAULT(UseLargePages, false);
3689 }
3690
3691 #elif defined(COMPILER2)
3692 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3693 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3694 }
3695 #endif
3696
3697 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3698 UNSUPPORTED_OPTION(ProfileInterpreter);
3699 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3700 #endif
3701
3702 #ifndef TIERED
3703 // Tiered compilation is undefined.
3704 UNSUPPORTED_OPTION(TieredCompilation);
3705 #endif
3706
3707 // If we are running in a headless jre, force java.awt.headless property
3708 // to be true unless the property has already been set.
3709 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3710 if (os::is_headless_jre()) {
3711 const char* headless = Arguments::get_property("java.awt.headless");
3712 if (headless == NULL) {
3713 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3714 if (headless_env == NULL) {
3715 if (!add_property("java.awt.headless=true")) {
3716 return JNI_ENOMEM;
3717 }
3718 } else {
3719 char buffer[256];
3720 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3721 if (!add_property(buffer)) {
3722 return JNI_ENOMEM;
3723 }
3724 }
3725 }
3726 }
3727
3728 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3729 // CMS can only be used with ParNew
3730 FLAG_SET_ERGO(bool, UseParNewGC, true);
3731 }
3732
3733 if (!check_vm_args_consistency()) {
3734 return JNI_ERR;
3735 }
3736
3737 return JNI_OK;
3738 }
3739
3740 // Helper class for controlling the lifetime of JavaVMInitArgs
3741 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3742 // deleted on the destruction of the ScopedVMInitArgs object.
3743 class ScopedVMInitArgs : public StackObj {
3744 private:
3745 JavaVMInitArgs _args;
3746 char* _container_name;
3747 bool _is_set;
3748 char* _vm_options_file_arg;
3749
3750 public:
3751 ScopedVMInitArgs(const char *container_name) {
3752 _args.version = JNI_VERSION_1_2;
3753 _args.nOptions = 0;
3754 _args.options = NULL;
3755 _args.ignoreUnrecognized = false;
3756 _container_name = (char *)container_name;
3757 _is_set = false;
3758 _vm_options_file_arg = NULL;
3759 }
3760
3761 // Populates the JavaVMInitArgs object represented by this
3762 // ScopedVMInitArgs object with the arguments in options. The
3763 // allocated memory is deleted by the destructor. If this method
3764 // returns anything other than JNI_OK, then this object is in a
3765 // partially constructed state, and should be abandoned.
3766 jint set_args(GrowableArray<JavaVMOption>* options) {
3767 _is_set = true;
3768 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3769 JavaVMOption, options->length(), mtArguments);
3770 if (options_arr == NULL) {
3771 return JNI_ENOMEM;
3772 }
3773 _args.options = options_arr;
3774
3775 for (int i = 0; i < options->length(); i++) {
3776 options_arr[i] = options->at(i);
3777 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3778 if (options_arr[i].optionString == NULL) {
3779 // Rely on the destructor to do cleanup.
3780 _args.nOptions = i;
3781 return JNI_ENOMEM;
3782 }
3783 }
3784
3785 _args.nOptions = options->length();
3786 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3787 return JNI_OK;
3788 }
3789
3790 JavaVMInitArgs* get() { return &_args; }
3791 char* container_name() { return _container_name; }
3792 bool is_set() { return _is_set; }
3793 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3794 char* vm_options_file_arg() { return _vm_options_file_arg; }
3795
3796 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3797 if (_vm_options_file_arg != NULL) {
3798 os::free(_vm_options_file_arg);
3799 }
3800 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3801 }
3802
3803 ~ScopedVMInitArgs() {
3804 if (_vm_options_file_arg != NULL) {
3805 os::free(_vm_options_file_arg);
3806 }
3807 if (_args.options == NULL) return;
3808 for (int i = 0; i < _args.nOptions; i++) {
3809 os::free(_args.options[i].optionString);
3810 }
3811 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3812 }
3813
3814 // Insert options into this option list, to replace option at
3815 // vm_options_file_pos (-XX:VMOptionsFile)
3816 jint insert(const JavaVMInitArgs* args,
3817 const JavaVMInitArgs* args_to_insert,
3818 const int vm_options_file_pos) {
3819 assert(_args.options == NULL, "shouldn't be set yet");
3820 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3821 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3822
3823 int length = args->nOptions + args_to_insert->nOptions - 1;
3824 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3825 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3826 for (int i = 0; i < args->nOptions; i++) {
3827 if (i == vm_options_file_pos) {
3828 // insert the new options starting at the same place as the
3829 // -XX:VMOptionsFile option
3830 for (int j = 0; j < args_to_insert->nOptions; j++) {
3831 options->push(args_to_insert->options[j]);
3832 }
3833 } else {
3834 options->push(args->options[i]);
3835 }
3836 }
3837 // make into options array
3838 jint result = set_args(options);
3839 delete options;
3840 return result;
3841 }
3842 };
3843
3844 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3845 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3846 }
3847
3848 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3849 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3850 }
3851
3852 jint Arguments::parse_options_environment_variable(const char* name,
3853 ScopedVMInitArgs* vm_args) {
3854 char *buffer = ::getenv(name);
3855
3856 // Don't check this environment variable if user has special privileges
3857 // (e.g. unix su command).
3858 if (buffer == NULL || os::have_special_privileges()) {
3859 return JNI_OK;
3860 }
3861
3862 if ((buffer = os::strdup(buffer)) == NULL) {
3863 return JNI_ENOMEM;
3864 }
3865
3866 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3867
3868 os::free(buffer);
3869 return retcode;
3870 }
3871
3872 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3873 // read file into buffer
3874 int fd = ::open(file_name, O_RDONLY);
3875 if (fd < 0) {
3876 jio_fprintf(defaultStream::error_stream(),
3877 "Could not open options file '%s'\n",
3878 file_name);
3879 return JNI_ERR;
3880 }
3881
3882 struct stat stbuf;
3883 int retcode = os::stat(file_name, &stbuf);
3884 if (retcode != 0) {
3885 jio_fprintf(defaultStream::error_stream(),
3886 "Could not stat options file '%s'\n",
3887 file_name);
3888 os::close(fd);
3889 return JNI_ERR;
3890 }
3891
3892 if (stbuf.st_size == 0) {
3893 // tell caller there is no option data and that is ok
3894 os::close(fd);
3895 return JNI_OK;
3896 }
3897
3898 // '+ 1' for NULL termination even with max bytes
3899 size_t bytes_alloc = stbuf.st_size + 1;
3900
3901 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3902 if (NULL == buf) {
3903 jio_fprintf(defaultStream::error_stream(),
3904 "Could not allocate read buffer for options file parse\n");
3905 os::close(fd);
3906 return JNI_ENOMEM;
3907 }
3908
3909 memset(buf, 0, bytes_alloc);
3910
3911 // Fill buffer
3912 // Use ::read() instead of os::read because os::read()
3913 // might do a thread state transition
3914 // and it is too early for that here
3915
3916 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3917 os::close(fd);
3918 if (bytes_read < 0) {
3919 FREE_C_HEAP_ARRAY(char, buf);
3920 jio_fprintf(defaultStream::error_stream(),
3921 "Could not read options file '%s'\n", file_name);
3922 return JNI_ERR;
3923 }
3924
3925 if (bytes_read == 0) {
3926 // tell caller there is no option data and that is ok
3927 FREE_C_HEAP_ARRAY(char, buf);
3928 return JNI_OK;
3929 }
3930
3931 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3932
3933 FREE_C_HEAP_ARRAY(char, buf);
3934 return retcode;
3935 }
3936
3937 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3938 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3939
3940 // some pointers to help with parsing
3941 char *buffer_end = buffer + buf_len;
3942 char *opt_hd = buffer;
3943 char *wrt = buffer;
3944 char *rd = buffer;
3945
3946 // parse all options
3947 while (rd < buffer_end) {
3948 // skip leading white space from the input string
3949 while (rd < buffer_end && isspace(*rd)) {
3950 rd++;
3951 }
3952
3953 if (rd >= buffer_end) {
3954 break;
3955 }
3956
3957 // Remember this is where we found the head of the token.
3958 opt_hd = wrt;
3959
3960 // Tokens are strings of non white space characters separated
3961 // by one or more white spaces.
3962 while (rd < buffer_end && !isspace(*rd)) {
3963 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3964 int quote = *rd; // matching quote to look for
3965 rd++; // don't copy open quote
3966 while (rd < buffer_end && *rd != quote) {
3967 // include everything (even spaces)
3968 // up until the close quote
3969 *wrt++ = *rd++; // copy to option string
3970 }
3971
3972 if (rd < buffer_end) {
3973 rd++; // don't copy close quote
3974 } else {
3975 // did not see closing quote
3976 jio_fprintf(defaultStream::error_stream(),
3977 "Unmatched quote in %s\n", name);
3978 delete options;
3979 return JNI_ERR;
3980 }
3981 } else {
3982 *wrt++ = *rd++; // copy to option string
3983 }
3984 }
3985
3986 // steal a white space character and set it to NULL
3987 *wrt++ = '\0';
3988 // We now have a complete token
3989
3990 JavaVMOption option;
3991 option.optionString = opt_hd;
3992 option.extraInfo = NULL;
3993
3994 options->append(option); // Fill in option
3995
3996 rd++; // Advance to next character
3997 }
3998
3999 // Fill out JavaVMInitArgs structure.
4000 jint status = vm_args->set_args(options);
4001
4002 delete options;
4003 return status;
4004 }
4005
4006 void Arguments::set_shared_spaces_flags() {
4007 if (DumpSharedSpaces) {
4008 if (Arguments::patch_dirs() != NULL) {
4009 vm_exit_during_initialization(
4010 "Cannot use the following option when dumping the shared archive", "-Xpatch");
4011 }
4012
4013 if (RequireSharedSpaces) {
4014 warning("Cannot dump shared archive while using shared archive");
4015 }
4016 UseSharedSpaces = false;
4017 #ifdef _LP64
4018 if (!UseCompressedOops || !UseCompressedClassPointers) {
4019 vm_exit_during_initialization(
4020 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
4021 }
4022 } else {
4023 if (!UseCompressedOops || !UseCompressedClassPointers) {
4024 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
4025 }
4026 #endif
4027 }
4028 }
4029
4030 // Sharing support
4031 // Construct the path to the archive
4032 static char* get_shared_archive_path() {
4033 char *shared_archive_path;
4034 if (SharedArchiveFile == NULL) {
4035 char jvm_path[JVM_MAXPATHLEN];
4036 os::jvm_path(jvm_path, sizeof(jvm_path));
4037 char *end = strrchr(jvm_path, *os::file_separator());
4038 if (end != NULL) *end = '\0';
4039 size_t jvm_path_len = strlen(jvm_path);
4040 size_t file_sep_len = strlen(os::file_separator());
4041 const size_t len = jvm_path_len + file_sep_len + 20;
4042 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
4043 if (shared_archive_path != NULL) {
4044 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
4045 jvm_path, os::file_separator());
4046 }
4047 } else {
4048 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
4049 }
4050 return shared_archive_path;
4051 }
4052
4053 #ifndef PRODUCT
4054 // Determine whether LogVMOutput should be implicitly turned on.
4055 static bool use_vm_log() {
4056 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
4057 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
4058 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
4059 PrintAssembly || TraceDeoptimization || TraceDependencies ||
4060 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
4061 return true;
4062 }
4063
4064 #ifdef COMPILER1
4065 if (PrintC1Statistics) {
4066 return true;
4067 }
4068 #endif // COMPILER1
4069
4070 #ifdef COMPILER2
4071 if (PrintOptoAssembly || PrintOptoStatistics) {
4072 return true;
4073 }
4074 #endif // COMPILER2
4075
4076 return false;
4077 }
4078
4079 #endif // PRODUCT
4080
4081 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
4082 for (int index = 0; index < args->nOptions; index++) {
4083 const JavaVMOption* option = args->options + index;
4084 const char* tail;
4085 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4086 return true;
4087 }
4088 }
4089 return false;
4090 }
4091
4092 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
4093 const char* vm_options_file,
4094 const int vm_options_file_pos,
4095 ScopedVMInitArgs* vm_options_file_args,
4096 ScopedVMInitArgs* args_out) {
4097 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
4098 if (code != JNI_OK) {
4099 return code;
4100 }
4101
4102 if (vm_options_file_args->get()->nOptions < 1) {
4103 return JNI_OK;
4104 }
4105
4106 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
4107 jio_fprintf(defaultStream::error_stream(),
4108 "A VM options file may not refer to a VM options file. "
4109 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
4110 "options file '%s' in options container '%s' is an error.\n",
4111 vm_options_file_args->vm_options_file_arg(),
4112 vm_options_file_args->container_name());
4113 return JNI_EINVAL;
4114 }
4115
4116 return args_out->insert(args, vm_options_file_args->get(),
4117 vm_options_file_pos);
4118 }
4119
4120 // Expand -XX:VMOptionsFile found in args_in as needed.
4121 // mod_args and args_out parameters may return values as needed.
4122 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
4123 ScopedVMInitArgs* mod_args,
4124 JavaVMInitArgs** args_out) {
4125 jint code = match_special_option_and_act(args_in, mod_args);
4126 if (code != JNI_OK) {
4127 return code;
4128 }
4129
4130 if (mod_args->is_set()) {
4131 // args_in contains -XX:VMOptionsFile and mod_args contains the
4132 // original options from args_in along with the options expanded
4133 // from the VMOptionsFile. Return a short-hand to the caller.
4134 *args_out = mod_args->get();
4135 } else {
4136 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
4137 }
4138 return JNI_OK;
4139 }
4140
4141 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
4142 ScopedVMInitArgs* args_out) {
4143 // Remaining part of option string
4144 const char* tail;
4145 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
4146
4147 for (int index = 0; index < args->nOptions; index++) {
4148 const JavaVMOption* option = args->options + index;
4149 if (ArgumentsExt::process_options(option)) {
4150 continue;
4151 }
4152 if (match_option(option, "-XX:Flags=", &tail)) {
4153 Arguments::set_jvm_flags_file(tail);
4154 continue;
4155 }
4156 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4157 if (vm_options_file_args.found_vm_options_file_arg()) {
4158 jio_fprintf(defaultStream::error_stream(),
4159 "The option '%s' is already specified in the options "
4160 "container '%s' so the specification of '%s' in the "
4161 "same options container is an error.\n",
4162 vm_options_file_args.vm_options_file_arg(),
4163 vm_options_file_args.container_name(),
4164 option->optionString);
4165 return JNI_EINVAL;
4166 }
4167 vm_options_file_args.set_vm_options_file_arg(option->optionString);
4168 // If there's a VMOptionsFile, parse that
4169 jint code = insert_vm_options_file(args, tail, index,
4170 &vm_options_file_args, args_out);
4171 if (code != JNI_OK) {
4172 return code;
4173 }
4174 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
4175 if (args_out->is_set()) {
4176 // The VMOptions file inserted some options so switch 'args'
4177 // to the new set of options, and continue processing which
4178 // preserves "last option wins" semantics.
4179 args = args_out->get();
4180 // The first option from the VMOptionsFile replaces the
4181 // current option. So we back track to process the
4182 // replacement option.
4183 index--;
4184 }
4185 continue;
4186 }
4187 if (match_option(option, "-XX:+PrintVMOptions")) {
4188 PrintVMOptions = true;
4189 continue;
4190 }
4191 if (match_option(option, "-XX:-PrintVMOptions")) {
4192 PrintVMOptions = false;
4193 continue;
4194 }
4195 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4196 IgnoreUnrecognizedVMOptions = true;
4197 continue;
4198 }
4199 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4200 IgnoreUnrecognizedVMOptions = false;
4201 continue;
4202 }
4203 if (match_option(option, "-XX:+PrintFlagsInitial")) {
4204 CommandLineFlags::printFlags(tty, false);
4205 vm_exit(0);
4206 }
4207 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4208 #if INCLUDE_NMT
4209 // The launcher did not setup nmt environment variable properly.
4210 if (!MemTracker::check_launcher_nmt_support(tail)) {
4211 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4212 }
4213
4214 // Verify if nmt option is valid.
4215 if (MemTracker::verify_nmt_option()) {
4216 // Late initialization, still in single-threaded mode.
4217 if (MemTracker::tracking_level() >= NMT_summary) {
4218 MemTracker::init();
4219 }
4220 } else {
4221 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4222 }
4223 continue;
4224 #else
4225 jio_fprintf(defaultStream::error_stream(),
4226 "Native Memory Tracking is not supported in this VM\n");
4227 return JNI_ERR;
4228 #endif
4229 }
4230
4231 #ifndef PRODUCT
4232 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4233 CommandLineFlags::printFlags(tty, true);
4234 vm_exit(0);
4235 }
4236 #endif
4237 }
4238 return JNI_OK;
4239 }
4240
4241 static void print_options(const JavaVMInitArgs *args) {
4242 const char* tail;
4243 for (int index = 0; index < args->nOptions; index++) {
4244 const JavaVMOption *option = args->options + index;
4245 if (match_option(option, "-XX:", &tail)) {
4246 logOption(tail);
4247 }
4248 }
4249 }
4250
4251 bool Arguments::handle_deprecated_print_gc_flags() {
4252 if (PrintGC) {
4253 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4254 }
4255 if (PrintGCDetails) {
4256 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4257 }
4258
4259 if (_gc_log_filename != NULL) {
4260 // -Xloggc was used to specify a filename
4261 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4262 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, NULL);
4263 } else if (PrintGC || PrintGCDetails) {
4264 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4265 }
4266 return true;
4267 }
4268
4269 // Parse entry point called from JNI_CreateJavaVM
4270
4271 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4272 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4273
4274 // Initialize ranges and constraints
4275 CommandLineFlagRangeList::init();
4276 CommandLineFlagConstraintList::init();
4277
4278 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4279 const char* hotspotrc = ".hotspotrc";
4280 bool settings_file_specified = false;
4281 bool needs_hotspotrc_warning = false;
4282 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4283 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4284
4285 // Pointers to current working set of containers
4286 JavaVMInitArgs* cur_cmd_args;
4287 JavaVMInitArgs* cur_java_options_args;
4288 JavaVMInitArgs* cur_java_tool_options_args;
4289
4290 // Containers for modified/expanded options
4291 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4292 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4293 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4294
4295
4296 jint code =
4297 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4298 if (code != JNI_OK) {
4299 return code;
4300 }
4301
4302 code = parse_java_options_environment_variable(&initial_java_options_args);
4303 if (code != JNI_OK) {
4304 return code;
4305 }
4306
4307 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4308 &mod_java_tool_options_args,
4309 &cur_java_tool_options_args);
4310 if (code != JNI_OK) {
4311 return code;
4312 }
4313
4314 code = expand_vm_options_as_needed(initial_cmd_args,
4315 &mod_cmd_args,
4316 &cur_cmd_args);
4317 if (code != JNI_OK) {
4318 return code;
4319 }
4320
4321 code = expand_vm_options_as_needed(initial_java_options_args.get(),
4322 &mod_java_options_args,
4323 &cur_java_options_args);
4324 if (code != JNI_OK) {
4325 return code;
4326 }
4327
4328 const char* flags_file = Arguments::get_jvm_flags_file();
4329 settings_file_specified = (flags_file != NULL);
4330
4331 if (IgnoreUnrecognizedVMOptions) {
4332 cur_cmd_args->ignoreUnrecognized = true;
4333 cur_java_tool_options_args->ignoreUnrecognized = true;
4334 cur_java_options_args->ignoreUnrecognized = true;
4335 }
4336
4337 // Parse specified settings file
4338 if (settings_file_specified) {
4339 if (!process_settings_file(flags_file, true,
4340 cur_cmd_args->ignoreUnrecognized)) {
4341 return JNI_EINVAL;
4342 }
4343 } else {
4344 #ifdef ASSERT
4345 // Parse default .hotspotrc settings file
4346 if (!process_settings_file(".hotspotrc", false,
4347 cur_cmd_args->ignoreUnrecognized)) {
4348 return JNI_EINVAL;
4349 }
4350 #else
4351 struct stat buf;
4352 if (os::stat(hotspotrc, &buf) == 0) {
4353 needs_hotspotrc_warning = true;
4354 }
4355 #endif
4356 }
4357
4358 if (PrintVMOptions) {
4359 print_options(cur_java_tool_options_args);
4360 print_options(cur_cmd_args);
4361 print_options(cur_java_options_args);
4362 }
4363
4364 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4365 jint result = parse_vm_init_args(cur_java_tool_options_args,
4366 cur_java_options_args,
4367 cur_cmd_args);
4368
4369 if (result != JNI_OK) {
4370 return result;
4371 }
4372
4373 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4374 SharedArchivePath = get_shared_archive_path();
4375 if (SharedArchivePath == NULL) {
4376 return JNI_ENOMEM;
4377 }
4378
4379 // Set up VerifySharedSpaces
4380 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4381 VerifySharedSpaces = true;
4382 }
4383
4384 // Delay warning until here so that we've had a chance to process
4385 // the -XX:-PrintWarnings flag
4386 if (needs_hotspotrc_warning) {
4387 warning("%s file is present but has been ignored. "
4388 "Run with -XX:Flags=%s to load the file.",
4389 hotspotrc, hotspotrc);
4390 }
4391
4392 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
4393 UNSUPPORTED_OPTION(UseLargePages);
4394 #endif
4395
4396 ArgumentsExt::report_unsupported_options();
4397
4398 #ifndef PRODUCT
4399 if (TraceBytecodesAt != 0) {
4400 TraceBytecodes = true;
4401 }
4402 if (CountCompiledCalls) {
4403 if (UseCounterDecay) {
4404 warning("UseCounterDecay disabled because CountCalls is set");
4405 UseCounterDecay = false;
4406 }
4407 }
4408 #endif // PRODUCT
4409
4410 if (ScavengeRootsInCode == 0) {
4411 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4412 warning("Forcing ScavengeRootsInCode non-zero");
4413 }
4414 ScavengeRootsInCode = 1;
4415 }
4416
4417 if (!handle_deprecated_print_gc_flags()) {
4418 return JNI_EINVAL;
4419 }
4420
4421 // Set object alignment values.
4422 set_object_alignment();
4423
4424 #if !INCLUDE_CDS
4425 if (DumpSharedSpaces || RequireSharedSpaces) {
4426 jio_fprintf(defaultStream::error_stream(),
4427 "Shared spaces are not supported in this VM\n");
4428 return JNI_ERR;
4429 }
4430 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4431 warning("Shared spaces are not supported in this VM");
4432 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4433 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4434 }
4435 no_shared_spaces("CDS Disabled");
4436 #endif // INCLUDE_CDS
4437
4438 return JNI_OK;
4439 }
4440
4441 jint Arguments::apply_ergo() {
4442
4443 // Set flags based on ergonomics.
4444 set_ergonomics_flags();
4445
4446 set_shared_spaces_flags();
4447
4448 // Check the GC selections again.
4449 if (!check_gc_consistency()) {
4450 return JNI_EINVAL;
4451 }
4452
4453 if (TieredCompilation) {
4454 set_tiered_flags();
4455 } else {
4456 int max_compilation_policy_choice = 1;
4457 #ifdef COMPILER2
4458 max_compilation_policy_choice = 2;
4459 #endif
4460 // Check if the policy is valid.
4461 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4462 vm_exit_during_initialization(
4463 "Incompatible compilation policy selected", NULL);
4464 }
4465 // Scale CompileThreshold
4466 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4467 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4468 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4469 }
4470 }
4471
4472 #ifdef COMPILER2
4473 #ifndef PRODUCT
4474 if (PrintIdealGraphLevel > 0) {
4475 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4476 }
4477 #endif
4478 #endif
4479
4480 // Set heap size based on available physical memory
4481 set_heap_size();
4482
4483 ArgumentsExt::set_gc_specific_flags();
4484
4485 // Initialize Metaspace flags and alignments
4486 Metaspace::ergo_initialize();
4487
4488 // Set bytecode rewriting flags
4489 set_bytecode_flags();
4490
4491 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4492 jint code = set_aggressive_opts_flags();
4493 if (code != JNI_OK) {
4494 return code;
4495 }
4496
4497 // Turn off biased locking for locking debug mode flags,
4498 // which are subtly different from each other but neither works with
4499 // biased locking
4500 if (UseHeavyMonitors
4501 #ifdef COMPILER1
4502 || !UseFastLocking
4503 #endif // COMPILER1
4504 #if INCLUDE_JVMCI
4505 || !JVMCIUseFastLocking
4506 #endif
4507 ) {
4508 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4509 // flag set to true on command line; warn the user that they
4510 // can't enable biased locking here
4511 warning("Biased Locking is not supported with locking debug flags"
4512 "; ignoring UseBiasedLocking flag." );
4513 }
4514 UseBiasedLocking = false;
4515 }
4516
4517 #ifdef CC_INTERP
4518 // Clear flags not supported on zero.
4519 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4520 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4521 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4522 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4523 #endif // CC_INTERP
4524
4525 #ifdef COMPILER2
4526 if (!EliminateLocks) {
4527 EliminateNestedLocks = false;
4528 }
4529 if (!Inline) {
4530 IncrementalInline = false;
4531 }
4532 #ifndef PRODUCT
4533 if (!IncrementalInline) {
4534 AlwaysIncrementalInline = false;
4535 }
4536 #endif
4537 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4538 // nothing to use the profiling, turn if off
4539 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4540 }
4541 #endif
4542
4543 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4544 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4545 DebugNonSafepoints = true;
4546 }
4547
4548 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4549 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4550 }
4551
4552 if (UseOnStackReplacement && !UseLoopCounter) {
4553 warning("On-stack-replacement requires loop counters; enabling loop counters");
4554 FLAG_SET_DEFAULT(UseLoopCounter, true);
4555 }
4556
4557 #ifndef PRODUCT
4558 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4559 if (use_vm_log()) {
4560 LogVMOutput = true;
4561 }
4562 }
4563 #endif // PRODUCT
4564
4565 if (PrintCommandLineFlags) {
4566 CommandLineFlags::printSetFlags(tty);
4567 }
4568
4569 // Apply CPU specific policy for the BiasedLocking
4570 if (UseBiasedLocking) {
4571 if (!VM_Version::use_biased_locking() &&
4572 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4573 UseBiasedLocking = false;
4574 }
4575 }
4576 #ifdef COMPILER2
4577 if (!UseBiasedLocking || EmitSync != 0) {
4578 UseOptoBiasInlining = false;
4579 }
4580 #endif
4581
4582 return JNI_OK;
4583 }
4584
4585 jint Arguments::adjust_after_os() {
4586 if (UseNUMA) {
4587 if (UseParallelGC || UseParallelOldGC) {
4588 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4589 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4590 }
4591 }
4592 // UseNUMAInterleaving is set to ON for all collectors and
4593 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4594 // such as the parallel collector for Linux and Solaris will
4595 // interleave old gen and survivor spaces on top of NUMA
4596 // allocation policy for the eden space.
4597 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4598 // all platforms and ParallelGC on Windows will interleave all
4599 // of the heap spaces across NUMA nodes.
4600 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4601 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4602 }
4603 }
4604 return JNI_OK;
4605 }
4606
4607 int Arguments::PropertyList_count(SystemProperty* pl) {
4608 int count = 0;
4609 while(pl != NULL) {
4610 count++;
4611 pl = pl->next();
4612 }
4613 return count;
4614 }
4615
4616 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4617 assert(key != NULL, "just checking");
4618 SystemProperty* prop;
4619 for (prop = pl; prop != NULL; prop = prop->next()) {
4620 if (strcmp(key, prop->key()) == 0) return prop->value();
4621 }
4622 return NULL;
4623 }
4624
4625 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4626 int count = 0;
4627 const char* ret_val = NULL;
4628
4629 while(pl != NULL) {
4630 if(count >= index) {
4631 ret_val = pl->key();
4632 break;
4633 }
4634 count++;
4635 pl = pl->next();
4636 }
4637
4638 return ret_val;
4639 }
4640
4641 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4642 int count = 0;
4643 char* ret_val = NULL;
4644
4645 while(pl != NULL) {
4646 if(count >= index) {
4647 ret_val = pl->value();
4648 break;
4649 }
4650 count++;
4651 pl = pl->next();
4652 }
4653
4654 return ret_val;
4655 }
4656
4657 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4658 SystemProperty* p = *plist;
4659 if (p == NULL) {
4660 *plist = new_p;
4661 } else {
4662 while (p->next() != NULL) {
4663 p = p->next();
4664 }
4665 p->set_next(new_p);
4666 }
4667 }
4668
4669 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v) {
4670 if (plist == NULL)
4671 return;
4672
4673 SystemProperty* new_p = new SystemProperty(k, v, true);
4674 PropertyList_add(plist, new_p);
4675 }
4676
4677 void Arguments::PropertyList_add(SystemProperty *element) {
4678 PropertyList_add(&_system_properties, element);
4679 }
4680
4681 // This add maintains unique property key in the list.
4682 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, jboolean append) {
4683 if (plist == NULL)
4684 return;
4685
4686 // If property key exist then update with new value.
4687 SystemProperty* prop;
4688 for (prop = *plist; prop != NULL; prop = prop->next()) {
4689 if (strcmp(k, prop->key()) == 0) {
4690 if (append) {
4691 prop->append_value(v);
4692 } else {
4693 prop->set_writeable_value(v);
4694 }
4695 return;
4696 }
4697 }
4698
4699 PropertyList_add(plist, k, v);
4700 }
4701
4702 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4703 // Returns true if all of the source pointed by src has been copied over to
4704 // the destination buffer pointed by buf. Otherwise, returns false.
4705 // Notes:
4706 // 1. If the length (buflen) of the destination buffer excluding the
4707 // NULL terminator character is not long enough for holding the expanded
4708 // pid characters, it also returns false instead of returning the partially
4709 // expanded one.
4710 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4711 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4712 char* buf, size_t buflen) {
4713 const char* p = src;
4714 char* b = buf;
4715 const char* src_end = &src[srclen];
4716 char* buf_end = &buf[buflen - 1];
4717
4718 while (p < src_end && b < buf_end) {
4719 if (*p == '%') {
4720 switch (*(++p)) {
4721 case '%': // "%%" ==> "%"
4722 *b++ = *p++;
4723 break;
4724 case 'p': { // "%p" ==> current process id
4725 // buf_end points to the character before the last character so
4726 // that we could write '\0' to the end of the buffer.
4727 size_t buf_sz = buf_end - b + 1;
4728 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4729
4730 // if jio_snprintf fails or the buffer is not long enough to hold
4731 // the expanded pid, returns false.
4732 if (ret < 0 || ret >= (int)buf_sz) {
4733 return false;
4734 } else {
4735 b += ret;
4736 assert(*b == '\0', "fail in copy_expand_pid");
4737 if (p == src_end && b == buf_end + 1) {
4738 // reach the end of the buffer.
4739 return true;
4740 }
4741 }
4742 p++;
4743 break;
4744 }
4745 default :
4746 *b++ = '%';
4747 }
4748 } else {
4749 *b++ = *p++;
4750 }
4751 }
4752 *b = '\0';
4753 return (p == src_end); // return false if not all of the source was copied
4754 }