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