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