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