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