1 /*
2 * Copyright (c) 1997, 2013, 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/javaAssertions.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "compiler/compilerOracle.hpp"
29 #include "memory/allocation.inline.hpp"
30 #include "memory/cardTableRS.hpp"
31 #include "memory/referenceProcessor.hpp"
32 #include "memory/universe.inline.hpp"
33 #include "oops/oop.inline.hpp"
34 #include "prims/jvmtiExport.hpp"
35 #include "runtime/arguments.hpp"
36 #include "runtime/globals_extension.hpp"
37 #include "runtime/java.hpp"
38 #include "services/management.hpp"
39 #include "services/memTracker.hpp"
40 #include "utilities/defaultStream.hpp"
41 #include "utilities/macros.hpp"
42 #include "utilities/taskqueue.hpp"
43 #ifdef TARGET_OS_FAMILY_linux
44 # include "os_linux.inline.hpp"
45 #endif
46 #ifdef TARGET_OS_FAMILY_solaris
47 # include "os_solaris.inline.hpp"
48 #endif
49 #ifdef TARGET_OS_FAMILY_windows
50 # include "os_windows.inline.hpp"
51 #endif
52 #ifdef TARGET_OS_FAMILY_bsd
53 # include "os_bsd.inline.hpp"
54 #endif
55 #include "memory/genCollectedHeap.hpp"
56 #if INCLUDE_ALL_GCS
57 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
58 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
59 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
60 #endif // INCLUDE_ALL_GCS
61
62 // Note: This is a special bug reporting site for the JVM
63 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
64 #define DEFAULT_JAVA_LAUNCHER "generic"
65
66 char** Arguments::_jvm_flags_array = NULL;
67 int Arguments::_num_jvm_flags = 0;
68 char** Arguments::_jvm_args_array = NULL;
69 int Arguments::_num_jvm_args = 0;
70 char* Arguments::_java_command = NULL;
71 SystemProperty* Arguments::_system_properties = NULL;
72 const char* Arguments::_gc_log_filename = NULL;
73 bool Arguments::_has_profile = false;
74 bool Arguments::_has_alloc_profile = false;
75 size_t Arguments::_max_heap_alignment = 0;
76 uintx Arguments::_min_heap_size = 0;
77 Arguments::Mode Arguments::_mode = _mixed;
78 bool Arguments::_java_compiler = false;
79 bool Arguments::_xdebug_mode = false;
80 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
81 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
82 int Arguments::_sun_java_launcher_pid = -1;
83 bool Arguments::_created_by_gamma_launcher = false;
84
85 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
86 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
87 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
88 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
89 bool Arguments::_ClipInlining = ClipInlining;
90
91 char* Arguments::SharedArchivePath = NULL;
92
93 AgentLibraryList Arguments::_libraryList;
94 AgentLibraryList Arguments::_agentList;
95
96 abort_hook_t Arguments::_abort_hook = NULL;
97 exit_hook_t Arguments::_exit_hook = NULL;
98 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
99
100
101 SystemProperty *Arguments::_java_ext_dirs = NULL;
102 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
103 SystemProperty *Arguments::_sun_boot_library_path = NULL;
104 SystemProperty *Arguments::_java_library_path = NULL;
105 SystemProperty *Arguments::_java_home = NULL;
106 SystemProperty *Arguments::_java_class_path = NULL;
107 SystemProperty *Arguments::_sun_boot_class_path = NULL;
108
109 char* Arguments::_meta_index_path = NULL;
110 char* Arguments::_meta_index_dir = NULL;
111
112 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
113
114 static bool match_option(const JavaVMOption *option, const char* name,
115 const char** tail) {
116 int len = (int)strlen(name);
117 if (strncmp(option->optionString, name, len) == 0) {
118 *tail = option->optionString + len;
119 return true;
120 } else {
121 return false;
122 }
123 }
124
125 static void logOption(const char* opt) {
126 if (PrintVMOptions) {
127 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
128 }
129 }
130
131 // Process java launcher properties.
132 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
133 // See if sun.java.launcher or sun.java.launcher.pid is defined.
134 // Must do this before setting up other system properties,
135 // as some of them may depend on launcher type.
136 for (int index = 0; index < args->nOptions; index++) {
137 const JavaVMOption* option = args->options + index;
138 const char* tail;
139
140 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
141 process_java_launcher_argument(tail, option->extraInfo);
142 continue;
143 }
144 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
145 _sun_java_launcher_pid = atoi(tail);
146 continue;
147 }
148 }
149 }
150
151 // Initialize system properties key and value.
152 void Arguments::init_system_properties() {
153
154 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
155 "Java Virtual Machine Specification", false));
156 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
157 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
158 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
159
160 // following are JVMTI agent writeable properties.
161 // Properties values are set to NULL and they are
162 // os specific they are initialized in os::init_system_properties_values().
163 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
164 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
165 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
166 _java_library_path = new SystemProperty("java.library.path", NULL, true);
167 _java_home = new SystemProperty("java.home", NULL, true);
168 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
169
170 _java_class_path = new SystemProperty("java.class.path", "", true);
171
172 // Add to System Property list.
173 PropertyList_add(&_system_properties, _java_ext_dirs);
174 PropertyList_add(&_system_properties, _java_endorsed_dirs);
175 PropertyList_add(&_system_properties, _sun_boot_library_path);
176 PropertyList_add(&_system_properties, _java_library_path);
177 PropertyList_add(&_system_properties, _java_home);
178 PropertyList_add(&_system_properties, _java_class_path);
179 PropertyList_add(&_system_properties, _sun_boot_class_path);
180
181 // Set OS specific system properties values
182 os::init_system_properties_values();
183 }
184
185
186 // Update/Initialize System properties after JDK version number is known
187 void Arguments::init_version_specific_system_properties() {
188 enum { bufsz = 16 };
189 char buffer[bufsz];
190 const char* spec_vendor = "Sun Microsystems Inc.";
191 uint32_t spec_version = 0;
192
193 if (JDK_Version::is_gte_jdk17x_version()) {
194 spec_vendor = "Oracle Corporation";
195 spec_version = JDK_Version::current().major_version();
196 }
197 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
198
199 PropertyList_add(&_system_properties,
200 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
201 PropertyList_add(&_system_properties,
202 new SystemProperty("java.vm.specification.version", buffer, false));
203 PropertyList_add(&_system_properties,
204 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
205 }
206
207 /**
208 * Provide a slightly more user-friendly way of eliminating -XX flags.
209 * When a flag is eliminated, it can be added to this list in order to
210 * continue accepting this flag on the command-line, while issuing a warning
211 * and ignoring the value. Once the JDK version reaches the 'accept_until'
212 * limit, we flatly refuse to admit the existence of the flag. This allows
213 * a flag to die correctly over JDK releases using HSX.
214 */
215 typedef struct {
216 const char* name;
217 JDK_Version obsoleted_in; // when the flag went away
218 JDK_Version accept_until; // which version to start denying the existence
219 } ObsoleteFlag;
220
221 static ObsoleteFlag obsolete_jvm_flags[] = {
222 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
223 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
229 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
230 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
231 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
232 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
233 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
234 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
235 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
236 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
237 { "DefaultInitialRAMFraction",
238 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
239 { "UseDepthFirstScavengeOrder",
240 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
241 { "HandlePromotionFailure",
242 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
243 { "MaxLiveObjectEvacuationRatio",
244 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
245 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
246 { "UseParallelOldGCCompacting",
247 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
248 { "UseParallelDensePrefixUpdate",
249 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
250 { "UseParallelOldGCDensePrefix",
251 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
252 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
253 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
254 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
255 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
256 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
257 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
258 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
259 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
260 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
261 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
262 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
263 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
264 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
265 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
266 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
267 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
268 #ifdef PRODUCT
269 { "DesiredMethodLimit",
270 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
271 #endif // PRODUCT
272 { NULL, JDK_Version(0), JDK_Version(0) }
273 };
274
275 // Returns true if the flag is obsolete and fits into the range specified
276 // for being ignored. In the case that the flag is ignored, the 'version'
277 // value is filled in with the version number when the flag became
278 // obsolete so that that value can be displayed to the user.
279 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
280 int i = 0;
281 assert(version != NULL, "Must provide a version buffer");
282 while (obsolete_jvm_flags[i].name != NULL) {
283 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
284 // <flag>=xxx form
285 // [-|+]<flag> form
286 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
287 ((s[0] == '+' || s[0] == '-') &&
288 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
289 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
290 *version = flag_status.obsoleted_in;
291 return true;
292 }
293 }
294 i++;
295 }
296 return false;
297 }
298
299 // Constructs the system class path (aka boot class path) from the following
300 // components, in order:
301 //
302 // prefix // from -Xbootclasspath/p:...
303 // endorsed // the expansion of -Djava.endorsed.dirs=...
304 // base // from os::get_system_properties() or -Xbootclasspath=
305 // suffix // from -Xbootclasspath/a:...
306 //
307 // java.endorsed.dirs is a list of directories; any jar or zip files in the
308 // directories are added to the sysclasspath just before the base.
309 //
310 // This could be AllStatic, but it isn't needed after argument processing is
311 // complete.
312 class SysClassPath: public StackObj {
313 public:
314 SysClassPath(const char* base);
315 ~SysClassPath();
316
317 inline void set_base(const char* base);
318 inline void add_prefix(const char* prefix);
319 inline void add_suffix_to_prefix(const char* suffix);
320 inline void add_suffix(const char* suffix);
321 inline void reset_path(const char* base);
322
323 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
324 // property. Must be called after all command-line arguments have been
325 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
326 // combined_path().
327 void expand_endorsed();
328
329 inline const char* get_base() const { return _items[_scp_base]; }
330 inline const char* get_prefix() const { return _items[_scp_prefix]; }
331 inline const char* get_suffix() const { return _items[_scp_suffix]; }
332 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
333
334 // Combine all the components into a single c-heap-allocated string; caller
335 // must free the string if/when no longer needed.
336 char* combined_path();
337
338 private:
339 // Utility routines.
340 static char* add_to_path(const char* path, const char* str, bool prepend);
341 static char* add_jars_to_path(char* path, const char* directory);
342
343 inline void reset_item_at(int index);
344
345 // Array indices for the items that make up the sysclasspath. All except the
346 // base are allocated in the C heap and freed by this class.
347 enum {
348 _scp_prefix, // from -Xbootclasspath/p:...
349 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
350 _scp_base, // the default sysclasspath
351 _scp_suffix, // from -Xbootclasspath/a:...
352 _scp_nitems // the number of items, must be last.
353 };
354
355 const char* _items[_scp_nitems];
356 DEBUG_ONLY(bool _expansion_done;)
357 };
358
359 SysClassPath::SysClassPath(const char* base) {
360 memset(_items, 0, sizeof(_items));
361 _items[_scp_base] = base;
362 DEBUG_ONLY(_expansion_done = false;)
363 }
364
365 SysClassPath::~SysClassPath() {
366 // Free everything except the base.
367 for (int i = 0; i < _scp_nitems; ++i) {
368 if (i != _scp_base) reset_item_at(i);
369 }
370 DEBUG_ONLY(_expansion_done = false;)
371 }
372
373 inline void SysClassPath::set_base(const char* base) {
374 _items[_scp_base] = base;
375 }
376
377 inline void SysClassPath::add_prefix(const char* prefix) {
378 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
379 }
380
381 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
382 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
383 }
384
385 inline void SysClassPath::add_suffix(const char* suffix) {
386 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
387 }
388
389 inline void SysClassPath::reset_item_at(int index) {
390 assert(index < _scp_nitems && index != _scp_base, "just checking");
391 if (_items[index] != NULL) {
392 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
393 _items[index] = NULL;
394 }
395 }
396
397 inline void SysClassPath::reset_path(const char* base) {
398 // Clear the prefix and suffix.
399 reset_item_at(_scp_prefix);
400 reset_item_at(_scp_suffix);
401 set_base(base);
402 }
403
404 //------------------------------------------------------------------------------
405
406 void SysClassPath::expand_endorsed() {
407 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
408
409 const char* path = Arguments::get_property("java.endorsed.dirs");
410 if (path == NULL) {
411 path = Arguments::get_endorsed_dir();
412 assert(path != NULL, "no default for java.endorsed.dirs");
413 }
414
415 char* expanded_path = NULL;
416 const char separator = *os::path_separator();
417 const char* const end = path + strlen(path);
418 while (path < end) {
419 const char* tmp_end = strchr(path, separator);
420 if (tmp_end == NULL) {
421 expanded_path = add_jars_to_path(expanded_path, path);
422 path = end;
423 } else {
424 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
425 memcpy(dirpath, path, tmp_end - path);
426 dirpath[tmp_end - path] = '\0';
427 expanded_path = add_jars_to_path(expanded_path, dirpath);
428 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
429 path = tmp_end + 1;
430 }
431 }
432 _items[_scp_endorsed] = expanded_path;
433 DEBUG_ONLY(_expansion_done = true;)
434 }
435
436 // Combine the bootclasspath elements, some of which may be null, into a single
437 // c-heap-allocated string.
438 char* SysClassPath::combined_path() {
439 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
440 assert(_expansion_done, "must call expand_endorsed() first.");
441
442 size_t lengths[_scp_nitems];
443 size_t total_len = 0;
444
445 const char separator = *os::path_separator();
446
447 // Get the lengths.
448 int i;
449 for (i = 0; i < _scp_nitems; ++i) {
450 if (_items[i] != NULL) {
451 lengths[i] = strlen(_items[i]);
452 // Include space for the separator char (or a NULL for the last item).
453 total_len += lengths[i] + 1;
454 }
455 }
456 assert(total_len > 0, "empty sysclasspath not allowed");
457
458 // Copy the _items to a single string.
459 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
460 char* cp_tmp = cp;
461 for (i = 0; i < _scp_nitems; ++i) {
462 if (_items[i] != NULL) {
463 memcpy(cp_tmp, _items[i], lengths[i]);
464 cp_tmp += lengths[i];
465 *cp_tmp++ = separator;
466 }
467 }
468 *--cp_tmp = '\0'; // Replace the extra separator.
469 return cp;
470 }
471
472 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
473 char*
474 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
475 char *cp;
476
477 assert(str != NULL, "just checking");
478 if (path == NULL) {
479 size_t len = strlen(str) + 1;
480 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
481 memcpy(cp, str, len); // copy the trailing null
482 } else {
483 const char separator = *os::path_separator();
484 size_t old_len = strlen(path);
485 size_t str_len = strlen(str);
486 size_t len = old_len + str_len + 2;
487
488 if (prepend) {
489 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
490 char* cp_tmp = cp;
491 memcpy(cp_tmp, str, str_len);
492 cp_tmp += str_len;
493 *cp_tmp = separator;
494 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
495 FREE_C_HEAP_ARRAY(char, path, mtInternal);
496 } else {
497 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
498 char* cp_tmp = cp + old_len;
499 *cp_tmp = separator;
500 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
501 }
502 }
503 return cp;
504 }
505
506 // Scan the directory and append any jar or zip files found to path.
507 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
508 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
509 DIR* dir = os::opendir(directory);
510 if (dir == NULL) return path;
511
512 char dir_sep[2] = { '\0', '\0' };
513 size_t directory_len = strlen(directory);
514 const char fileSep = *os::file_separator();
515 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
516
517 /* Scan the directory for jars/zips, appending them to path. */
518 struct dirent *entry;
519 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
520 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
521 const char* name = entry->d_name;
522 const char* ext = name + strlen(name) - 4;
523 bool isJarOrZip = ext > name &&
524 (os::file_name_strcmp(ext, ".jar") == 0 ||
525 os::file_name_strcmp(ext, ".zip") == 0);
526 if (isJarOrZip) {
527 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
528 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
529 path = add_to_path(path, jarpath, false);
530 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
531 }
532 }
533 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
534 os::closedir(dir);
535 return path;
536 }
537
538 // Parses a memory size specification string.
539 static bool atomull(const char *s, julong* result) {
540 julong n = 0;
541 int args_read = sscanf(s, JULONG_FORMAT, &n);
542 if (args_read != 1) {
543 return false;
544 }
545 while (*s != '\0' && isdigit(*s)) {
546 s++;
547 }
548 // 4705540: illegal if more characters are found after the first non-digit
549 if (strlen(s) > 1) {
550 return false;
551 }
552 switch (*s) {
553 case 'T': case 't':
554 *result = n * G * K;
555 // Check for overflow.
556 if (*result/((julong)G * K) != n) return false;
557 return true;
558 case 'G': case 'g':
559 *result = n * G;
560 if (*result/G != n) return false;
561 return true;
562 case 'M': case 'm':
563 *result = n * M;
564 if (*result/M != n) return false;
565 return true;
566 case 'K': case 'k':
567 *result = n * K;
568 if (*result/K != n) return false;
569 return true;
570 case '\0':
571 *result = n;
572 return true;
573 default:
574 return false;
575 }
576 }
577
578 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
579 if (size < min_size) return arg_too_small;
580 // Check that size will fit in a size_t (only relevant on 32-bit)
581 if (size > max_uintx) return arg_too_big;
582 return arg_in_range;
583 }
584
585 // Describe an argument out of range error
586 void Arguments::describe_range_error(ArgsRange errcode) {
587 switch(errcode) {
588 case arg_too_big:
589 jio_fprintf(defaultStream::error_stream(),
590 "The specified size exceeds the maximum "
591 "representable size.\n");
592 break;
593 case arg_too_small:
594 case arg_unreadable:
595 case arg_in_range:
596 // do nothing for now
597 break;
598 default:
599 ShouldNotReachHere();
600 }
601 }
602
603 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
604 return CommandLineFlags::boolAtPut(name, &value, origin);
605 }
606
607 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
608 double v;
609 if (sscanf(value, "%lf", &v) != 1) {
610 return false;
611 }
612
613 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
614 return true;
615 }
616 return false;
617 }
618
619 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
620 julong v;
621 intx intx_v;
622 bool is_neg = false;
623 // Check the sign first since atomull() parses only unsigned values.
624 if (*value == '-') {
625 if (!CommandLineFlags::intxAt(name, &intx_v)) {
626 return false;
627 }
628 value++;
629 is_neg = true;
630 }
631 if (!atomull(value, &v)) {
632 return false;
633 }
634 intx_v = (intx) v;
635 if (is_neg) {
636 intx_v = -intx_v;
637 }
638 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
639 return true;
640 }
641 uintx uintx_v = (uintx) v;
642 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
643 return true;
644 }
645 uint64_t uint64_t_v = (uint64_t) v;
646 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
647 return true;
648 }
649 return false;
650 }
651
652 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
653 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
654 // Contract: CommandLineFlags always returns a pointer that needs freeing.
655 FREE_C_HEAP_ARRAY(char, value, mtInternal);
656 return true;
657 }
658
659 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
660 const char* old_value = "";
661 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
662 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
663 size_t new_len = strlen(new_value);
664 const char* value;
665 char* free_this_too = NULL;
666 if (old_len == 0) {
667 value = new_value;
668 } else if (new_len == 0) {
669 value = old_value;
670 } else {
671 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
672 // each new setting adds another LINE to the switch:
673 sprintf(buf, "%s\n%s", old_value, new_value);
674 value = buf;
675 free_this_too = buf;
676 }
677 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
678 // CommandLineFlags always returns a pointer that needs freeing.
679 FREE_C_HEAP_ARRAY(char, value, mtInternal);
680 if (free_this_too != NULL) {
681 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
682 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
683 }
684 return true;
685 }
686
687 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
688
689 // range of acceptable characters spelled out for portability reasons
690 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
691 #define BUFLEN 255
692 char name[BUFLEN+1];
693 char dummy;
694
695 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
696 return set_bool_flag(name, false, origin);
697 }
698 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
699 return set_bool_flag(name, true, origin);
700 }
701
702 char punct;
703 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
704 const char* value = strchr(arg, '=') + 1;
705 Flag* flag = Flag::find_flag(name, strlen(name));
706 if (flag != NULL && flag->is_ccstr()) {
707 if (flag->ccstr_accumulates()) {
708 return append_to_string_flag(name, value, origin);
709 } else {
710 if (value[0] == '\0') {
711 value = NULL;
712 }
713 return set_string_flag(name, value, origin);
714 }
715 }
716 }
717
718 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
719 const char* value = strchr(arg, '=') + 1;
720 // -XX:Foo:=xxx will reset the string flag to the given value.
721 if (value[0] == '\0') {
722 value = NULL;
723 }
724 return set_string_flag(name, value, origin);
725 }
726
727 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
728 #define SIGNED_NUMBER_RANGE "[-0123456789]"
729 #define NUMBER_RANGE "[0123456789]"
730 char value[BUFLEN + 1];
731 char value2[BUFLEN + 1];
732 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
733 // Looks like a floating-point number -- try again with more lenient format string
734 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
735 return set_fp_numeric_flag(name, value, origin);
736 }
737 }
738
739 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
740 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
741 return set_numeric_flag(name, value, origin);
742 }
743
744 return false;
745 }
746
747 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
748 assert(bldarray != NULL, "illegal argument");
749
750 if (arg == NULL) {
751 return;
752 }
753
754 int new_count = *count + 1;
755
756 // expand the array and add arg to the last element
757 if (*bldarray == NULL) {
758 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
759 } else {
760 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
761 }
762 (*bldarray)[*count] = strdup(arg);
763 *count = new_count;
764 }
765
766 void Arguments::build_jvm_args(const char* arg) {
767 add_string(&_jvm_args_array, &_num_jvm_args, arg);
768 }
769
770 void Arguments::build_jvm_flags(const char* arg) {
771 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
772 }
773
774 // utility function to return a string that concatenates all
775 // strings in a given char** array
776 const char* Arguments::build_resource_string(char** args, int count) {
777 if (args == NULL || count == 0) {
778 return NULL;
779 }
780 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
781 for (int i = 1; i < count; i++) {
782 length += strlen(args[i]) + 1; // add 1 for a space
783 }
784 char* s = NEW_RESOURCE_ARRAY(char, length);
785 strcpy(s, args[0]);
786 for (int j = 1; j < count; j++) {
787 strcat(s, " ");
788 strcat(s, args[j]);
789 }
790 return (const char*) s;
791 }
792
793 void Arguments::print_on(outputStream* st) {
794 st->print_cr("VM Arguments:");
795 if (num_jvm_flags() > 0) {
796 st->print("jvm_flags: "); print_jvm_flags_on(st);
797 }
798 if (num_jvm_args() > 0) {
799 st->print("jvm_args: "); print_jvm_args_on(st);
800 }
801 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
802 if (_java_class_path != NULL) {
803 char* path = _java_class_path->value();
804 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
805 }
806 st->print_cr("Launcher Type: %s", _sun_java_launcher);
807 }
808
809 void Arguments::print_jvm_flags_on(outputStream* st) {
810 if (_num_jvm_flags > 0) {
811 for (int i=0; i < _num_jvm_flags; i++) {
812 st->print("%s ", _jvm_flags_array[i]);
813 }
814 st->print_cr("");
815 }
816 }
817
818 void Arguments::print_jvm_args_on(outputStream* st) {
819 if (_num_jvm_args > 0) {
820 for (int i=0; i < _num_jvm_args; i++) {
821 st->print("%s ", _jvm_args_array[i]);
822 }
823 st->print_cr("");
824 }
825 }
826
827 bool Arguments::process_argument(const char* arg,
828 jboolean ignore_unrecognized, FlagValueOrigin origin) {
829
830 JDK_Version since = JDK_Version();
831
832 if (parse_argument(arg, origin) || ignore_unrecognized) {
833 return true;
834 }
835
836 bool has_plus_minus = (*arg == '+' || *arg == '-');
837 const char* const argname = has_plus_minus ? arg + 1 : arg;
838 if (is_newly_obsolete(arg, &since)) {
839 char version[256];
840 since.to_string(version, sizeof(version));
841 warning("ignoring option %s; support was removed in %s", argname, version);
842 return true;
843 }
844
845 // For locked flags, report a custom error message if available.
846 // Otherwise, report the standard unrecognized VM option.
847
848 size_t arg_len;
849 const char* equal_sign = strchr(argname, '=');
850 if (equal_sign == NULL) {
851 arg_len = strlen(argname);
852 } else {
853 arg_len = equal_sign - argname;
854 }
855
856 Flag* found_flag = Flag::find_flag((char*)argname, arg_len, true);
857 if (found_flag != NULL) {
858 char locked_message_buf[BUFLEN];
859 found_flag->get_locked_message(locked_message_buf, BUFLEN);
860 if (strlen(locked_message_buf) == 0) {
861 if (found_flag->is_bool() && !has_plus_minus) {
862 jio_fprintf(defaultStream::error_stream(),
863 "Missing +/- setting for VM option '%s'\n", argname);
864 } else if (!found_flag->is_bool() && has_plus_minus) {
865 jio_fprintf(defaultStream::error_stream(),
866 "Unexpected +/- setting in VM option '%s'\n", argname);
867 } else {
868 jio_fprintf(defaultStream::error_stream(),
869 "Improperly specified VM option '%s'\n", argname);
870 }
871 } else {
872 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
873 }
874 } else {
875 jio_fprintf(defaultStream::error_stream(),
876 "Unrecognized VM option '%s'\n", argname);
877 }
878
879 // allow for commandline "commenting out" options like -XX:#+Verbose
880 return arg[0] == '#';
881 }
882
883 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
884 FILE* stream = fopen(file_name, "rb");
885 if (stream == NULL) {
886 if (should_exist) {
887 jio_fprintf(defaultStream::error_stream(),
888 "Could not open settings file %s\n", file_name);
889 return false;
890 } else {
891 return true;
892 }
893 }
894
895 char token[1024];
896 int pos = 0;
897
898 bool in_white_space = true;
899 bool in_comment = false;
900 bool in_quote = false;
901 char quote_c = 0;
902 bool result = true;
903
904 int c = getc(stream);
905 while(c != EOF && pos < (int)(sizeof(token)-1)) {
906 if (in_white_space) {
907 if (in_comment) {
908 if (c == '\n') in_comment = false;
909 } else {
910 if (c == '#') in_comment = true;
911 else if (!isspace(c)) {
912 in_white_space = false;
913 token[pos++] = c;
914 }
915 }
916 } else {
917 if (c == '\n' || (!in_quote && isspace(c))) {
918 // token ends at newline, or at unquoted whitespace
919 // this allows a way to include spaces in string-valued options
920 token[pos] = '\0';
921 logOption(token);
922 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
923 build_jvm_flags(token);
924 pos = 0;
925 in_white_space = true;
926 in_quote = false;
927 } else if (!in_quote && (c == '\'' || c == '"')) {
928 in_quote = true;
929 quote_c = c;
930 } else if (in_quote && (c == quote_c)) {
931 in_quote = false;
932 } else {
933 token[pos++] = c;
934 }
935 }
936 c = getc(stream);
937 }
938 if (pos > 0) {
939 token[pos] = '\0';
940 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
941 build_jvm_flags(token);
942 }
943 fclose(stream);
944 return result;
945 }
946
947 //=============================================================================================================
948 // Parsing of properties (-D)
949
950 const char* Arguments::get_property(const char* key) {
951 return PropertyList_get_value(system_properties(), key);
952 }
953
954 bool Arguments::add_property(const char* prop) {
955 const char* eq = strchr(prop, '=');
956 char* key;
957 // ns must be static--its address may be stored in a SystemProperty object.
958 const static char ns[1] = {0};
959 char* value = (char *)ns;
960
961 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
962 key = AllocateHeap(key_len + 1, mtInternal);
963 strncpy(key, prop, key_len);
964 key[key_len] = '\0';
965
966 if (eq != NULL) {
967 size_t value_len = strlen(prop) - key_len - 1;
968 value = AllocateHeap(value_len + 1, mtInternal);
969 strncpy(value, &prop[key_len + 1], value_len + 1);
970 }
971
972 if (strcmp(key, "java.compiler") == 0) {
973 process_java_compiler_argument(value);
974 FreeHeap(key);
975 if (eq != NULL) {
976 FreeHeap(value);
977 }
978 return true;
979 } else if (strcmp(key, "sun.java.command") == 0) {
980 _java_command = value;
981
982 // Record value in Arguments, but let it get passed to Java.
983 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
984 // launcher.pid property is private and is processed
985 // in process_sun_java_launcher_properties();
986 // the sun.java.launcher property is passed on to the java application
987 FreeHeap(key);
988 if (eq != NULL) {
989 FreeHeap(value);
990 }
991 return true;
992 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
993 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
994 // its value without going through the property list or making a Java call.
995 _java_vendor_url_bug = value;
996 } else if (strcmp(key, "sun.boot.library.path") == 0) {
997 PropertyList_unique_add(&_system_properties, key, value, true);
998 return true;
999 }
1000 // Create new property and add at the end of the list
1001 PropertyList_unique_add(&_system_properties, key, value);
1002 return true;
1003 }
1004
1005 //===========================================================================================================
1006 // Setting int/mixed/comp mode flags
1007
1008 void Arguments::set_mode_flags(Mode mode) {
1009 // Set up default values for all flags.
1010 // If you add a flag to any of the branches below,
1011 // add a default value for it here.
1012 set_java_compiler(false);
1013 _mode = mode;
1014
1015 // Ensure Agent_OnLoad has the correct initial values.
1016 // This may not be the final mode; mode may change later in onload phase.
1017 PropertyList_unique_add(&_system_properties, "java.vm.info",
1018 (char*)VM_Version::vm_info_string(), false);
1019
1020 UseInterpreter = true;
1021 UseCompiler = true;
1022 UseLoopCounter = true;
1023
1024 #ifndef ZERO
1025 // Turn these off for mixed and comp. Leave them on for Zero.
1026 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1027 UseFastAccessorMethods = (mode == _int);
1028 }
1029 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1030 UseFastEmptyMethods = (mode == _int);
1031 }
1032 #endif
1033
1034 // Default values may be platform/compiler dependent -
1035 // use the saved values
1036 ClipInlining = Arguments::_ClipInlining;
1037 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1038 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1039 BackgroundCompilation = Arguments::_BackgroundCompilation;
1040
1041 // Change from defaults based on mode
1042 switch (mode) {
1043 default:
1044 ShouldNotReachHere();
1045 break;
1046 case _int:
1047 UseCompiler = false;
1048 UseLoopCounter = false;
1049 AlwaysCompileLoopMethods = false;
1050 UseOnStackReplacement = false;
1051 break;
1052 case _mixed:
1053 // same as default
1054 break;
1055 case _comp:
1056 UseInterpreter = false;
1057 BackgroundCompilation = false;
1058 ClipInlining = false;
1059 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1060 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1061 // compile a level 4 (C2) and then continue executing it.
1062 if (TieredCompilation) {
1063 Tier3InvokeNotifyFreqLog = 0;
1064 Tier4InvocationThreshold = 0;
1065 }
1066 break;
1067 }
1068 }
1069
1070 // Conflict: required to use shared spaces (-Xshare:on), but
1071 // incompatible command line options were chosen.
1072
1073 static void no_shared_spaces() {
1074 if (RequireSharedSpaces) {
1075 jio_fprintf(defaultStream::error_stream(),
1076 "Class data sharing is inconsistent with other specified options.\n");
1077 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1078 } else {
1079 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1080 }
1081 }
1082
1083 void Arguments::set_tiered_flags() {
1084 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1085 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1086 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1087 }
1088 if (CompilationPolicyChoice < 2) {
1089 vm_exit_during_initialization(
1090 "Incompatible compilation policy selected", NULL);
1091 }
1092 // Increase the code cache size - tiered compiles a lot more.
1093 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1094 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1095 }
1096 if (!UseInterpreter) { // -Xcomp
1097 Tier3InvokeNotifyFreqLog = 0;
1098 Tier4InvocationThreshold = 0;
1099 }
1100 }
1101
1102 #if INCLUDE_ALL_GCS
1103 static void disable_adaptive_size_policy(const char* collector_name) {
1104 if (UseAdaptiveSizePolicy) {
1105 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1106 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1107 collector_name);
1108 }
1109 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1110 }
1111 }
1112
1113 void Arguments::set_parnew_gc_flags() {
1114 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1115 "control point invariant");
1116 assert(UseParNewGC, "Error");
1117
1118 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1119 disable_adaptive_size_policy("UseParNewGC");
1120
1121 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1122 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1123 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1124 } else if (ParallelGCThreads == 0) {
1125 jio_fprintf(defaultStream::error_stream(),
1126 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1127 vm_exit(1);
1128 }
1129
1130 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1131 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1132 // we set them to 1024 and 1024.
1133 // See CR 6362902.
1134 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1135 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1136 }
1137 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1138 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1139 }
1140
1141 // AlwaysTenure flag should make ParNew promote all at first collection.
1142 // See CR 6362902.
1143 if (AlwaysTenure) {
1144 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1145 }
1146 // When using compressed oops, we use local overflow stacks,
1147 // rather than using a global overflow list chained through
1148 // the klass word of the object's pre-image.
1149 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1150 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1151 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1152 }
1153 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1154 }
1155 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1156 }
1157
1158 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1159 // sparc/solaris for certain applications, but would gain from
1160 // further optimization and tuning efforts, and would almost
1161 // certainly gain from analysis of platform and environment.
1162 void Arguments::set_cms_and_parnew_gc_flags() {
1163 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1164 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1165
1166 // If we are using CMS, we prefer to UseParNewGC,
1167 // unless explicitly forbidden.
1168 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1169 FLAG_SET_ERGO(bool, UseParNewGC, true);
1170 }
1171
1172 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1173 disable_adaptive_size_policy("UseConcMarkSweepGC");
1174
1175 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1176 // as needed.
1177 if (UseParNewGC) {
1178 set_parnew_gc_flags();
1179 }
1180
1181 size_t max_heap = align_size_down(MaxHeapSize,
1182 CardTableRS::ct_max_alignment_constraint());
1183
1184 // Now make adjustments for CMS
1185 intx tenuring_default = (intx)6;
1186 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1187
1188 // Preferred young gen size for "short" pauses:
1189 // upper bound depends on # of threads and NewRatio.
1190 const uintx parallel_gc_threads =
1191 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1192 const size_t preferred_max_new_size_unaligned =
1193 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1194 size_t preferred_max_new_size =
1195 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1196
1197 // Unless explicitly requested otherwise, size young gen
1198 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1199
1200 // If either MaxNewSize or NewRatio is set on the command line,
1201 // assume the user is trying to set the size of the young gen.
1202 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1203
1204 // Set MaxNewSize to our calculated preferred_max_new_size unless
1205 // NewSize was set on the command line and it is larger than
1206 // preferred_max_new_size.
1207 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1208 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1209 } else {
1210 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1211 }
1212 if (PrintGCDetails && Verbose) {
1213 // Too early to use gclog_or_tty
1214 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1215 }
1216
1217 // Code along this path potentially sets NewSize and OldSize
1218 if (PrintGCDetails && Verbose) {
1219 // Too early to use gclog_or_tty
1220 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1221 " initial_heap_size: " SIZE_FORMAT
1222 " max_heap: " SIZE_FORMAT,
1223 min_heap_size(), InitialHeapSize, max_heap);
1224 }
1225 size_t min_new = preferred_max_new_size;
1226 if (FLAG_IS_CMDLINE(NewSize)) {
1227 min_new = NewSize;
1228 }
1229 if (max_heap > min_new && min_heap_size() > min_new) {
1230 // Unless explicitly requested otherwise, make young gen
1231 // at least min_new, and at most preferred_max_new_size.
1232 if (FLAG_IS_DEFAULT(NewSize)) {
1233 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1234 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1235 if (PrintGCDetails && Verbose) {
1236 // Too early to use gclog_or_tty
1237 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1238 }
1239 }
1240 // Unless explicitly requested otherwise, size old gen
1241 // so it's NewRatio x of NewSize.
1242 if (FLAG_IS_DEFAULT(OldSize)) {
1243 if (max_heap > NewSize) {
1244 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1245 if (PrintGCDetails && Verbose) {
1246 // Too early to use gclog_or_tty
1247 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1248 }
1249 }
1250 }
1251 }
1252 }
1253 // Unless explicitly requested otherwise, definitely
1254 // promote all objects surviving "tenuring_default" scavenges.
1255 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1256 FLAG_IS_DEFAULT(SurvivorRatio)) {
1257 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1258 }
1259 // If we decided above (or user explicitly requested)
1260 // `promote all' (via MaxTenuringThreshold := 0),
1261 // prefer minuscule survivor spaces so as not to waste
1262 // space for (non-existent) survivors
1263 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1264 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1265 }
1266 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1267 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1268 // This is done in order to make ParNew+CMS configuration to work
1269 // with YoungPLABSize and OldPLABSize options.
1270 // See CR 6362902.
1271 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1272 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1273 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1274 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1275 // the value (either from the command line or ergonomics) of
1276 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1277 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1278 } else {
1279 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1280 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1281 // we'll let it to take precedence.
1282 jio_fprintf(defaultStream::error_stream(),
1283 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1284 " options are specified for the CMS collector."
1285 " CMSParPromoteBlocksToClaim will take precedence.\n");
1286 }
1287 }
1288 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1289 // OldPLAB sizing manually turned off: Use a larger default setting,
1290 // unless it was manually specified. This is because a too-low value
1291 // will slow down scavenges.
1292 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1293 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1294 }
1295 }
1296 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1297 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1298 // If either of the static initialization defaults have changed, note this
1299 // modification.
1300 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1301 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1302 }
1303 if (PrintGCDetails && Verbose) {
1304 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1305 MarkStackSize / K, MarkStackSizeMax / K);
1306 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1307 }
1308 }
1309 #endif // INCLUDE_ALL_GCS
1310
1311 void set_object_alignment() {
1312 // Object alignment.
1313 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1314 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1315 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1316 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1317 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1318 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1319
1320 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1321 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1322
1323 // Oop encoding heap max
1324 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1325
1326 #if INCLUDE_ALL_GCS
1327 // Set CMS global values
1328 CompactibleFreeListSpace::set_cms_values();
1329 #endif // INCLUDE_ALL_GCS
1330 }
1331
1332 bool verify_object_alignment() {
1333 // Object alignment.
1334 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1335 jio_fprintf(defaultStream::error_stream(),
1336 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1337 (int)ObjectAlignmentInBytes);
1338 return false;
1339 }
1340 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1341 jio_fprintf(defaultStream::error_stream(),
1342 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1343 (int)ObjectAlignmentInBytes, BytesPerLong);
1344 return false;
1345 }
1346 // It does not make sense to have big object alignment
1347 // since a space lost due to alignment will be greater
1348 // then a saved space from compressed oops.
1349 if ((int)ObjectAlignmentInBytes > 256) {
1350 jio_fprintf(defaultStream::error_stream(),
1351 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1352 (int)ObjectAlignmentInBytes);
1353 return false;
1354 }
1355 // In case page size is very small.
1356 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1357 jio_fprintf(defaultStream::error_stream(),
1358 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1359 (int)ObjectAlignmentInBytes, os::vm_page_size());
1360 return false;
1361 }
1362 return true;
1363 }
1364
1365 bool Arguments::apply_ergonomics_on_classmetaspacesize() {
1366 return FLAG_IS_DEFAULT(ClassMetaspaceSize);
1367 }
1368
1369 size_t Arguments::max_heap_for_compressed_oops() {
1370 // determine the maximum heap size that allows compressed oops. Use the theoretical
1371 // maximum (OopEncodingHeapMax) and subtract the sizes of other areas that need
1372 // to be below that maximum. Use a conservative estimate on the alignment returned
1373 // by max_heap_alignment() to calculate these estimates for the other areas.
1374 // We need to apply the alignment on all areas separately to make sure that later,
1375 // when aligning the final heap size up, all sizes fit below the absolute maximum.
1376
1377 // the absolute theoretical maximum for the heap with compressed oops
1378 size_t max_total_heap = OopEncodingHeapMax;
1379
1380 size_t max_class_metaspace_size = ClassMetaspaceSize;
1381 if (apply_ergonomics_on_classmetaspacesize()) {
1382 max_class_metaspace_size = MAX2(max_class_metaspace_size, ErgoClassMetaspaceSize);
1383 }
1384 size_t aligned_metaspace_size = align_size_up_(max_class_metaspace_size, max_heap_alignment());
1385 size_t aligned_page_size = align_size_up_(os::vm_page_size(), max_heap_alignment());
1386 // Avoid sign flip.
1387 if (max_total_heap < aligned_metaspace_size + aligned_page_size) {
1388 return 0;
1389 }
1390 LP64_ONLY(return max_total_heap - aligned_metaspace_size - aligned_page_size);
1391 NOT_LP64(ShouldNotReachHere(); return 0);
1392 }
1393
1394 bool Arguments::should_auto_select_low_pause_collector() {
1395 if (UseAutoGCSelectPolicy &&
1396 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1397 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1398 if (PrintGCDetails) {
1399 // Cannot use gclog_or_tty yet.
1400 tty->print_cr("Automatic selection of the low pause collector"
1401 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1402 }
1403 return true;
1404 }
1405 return false;
1406 }
1407
1408 void Arguments::set_use_compressed_oops() {
1409 #ifndef ZERO
1410 #ifdef _LP64
1411 // MaxHeapSize is not set up properly at this point, but
1412 // the only value that can override MaxHeapSize if we are
1413 // to use UseCompressedOops is InitialHeapSize.
1414 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1415
1416 if (max_heap_size <= max_heap_for_compressed_oops()) {
1417 #if !defined(COMPILER1) || defined(TIERED)
1418 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1419 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1420 }
1421 #endif
1422 #ifdef _WIN64
1423 if (UseLargePages && UseCompressedOops) {
1424 // Cannot allocate guard pages for implicit checks in indexed addressing
1425 // mode, when large pages are specified on windows.
1426 // This flag could be switched ON if narrow oop base address is set to 0,
1427 // see code in Universe::initialize_heap().
1428 Universe::set_narrow_oop_use_implicit_null_checks(false);
1429 }
1430 #endif // _WIN64
1431 } else {
1432 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1433 warning("Max heap size too large for Compressed Oops");
1434 FLAG_SET_DEFAULT(UseCompressedOops, false);
1435 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1436 }
1437 }
1438 #endif // _LP64
1439 #endif // ZERO
1440 }
1441
1442 void Arguments::set_max_heap_alignment() {
1443 size_t gc_alignment;
1444 #if INCLUDE_ALL_GCS
1445 if (UseParallelGC) {
1446 gc_alignment = ParallelScavengeHeap::max_heap_alignment();
1447 } else if (UseG1GC) {
1448 gc_alignment = G1CollectedHeap::max_heap_alignment();
1449 } else {
1450 #endif // INCLUDE_ALL_GCS
1451 gc_alignment = GenCollectedHeap::max_heap_alignment();
1452 #if INCLUDE_ALL_GCS
1453 }
1454 #endif // INCLUDE_ALL_GCS
1455 _max_heap_alignment = MAX3(gc_alignment, os::max_page_size(),
1456 CollectorPolicy::compute_max_alignment());
1457 }
1458
1459 void Arguments::set_ergonomics_flags() {
1460
1461 if (os::is_server_class_machine()) {
1462 // If no other collector is requested explicitly,
1463 // let the VM select the collector based on
1464 // machine class and automatic selection policy.
1465 if (!UseSerialGC &&
1466 !UseConcMarkSweepGC &&
1467 !UseG1GC &&
1468 !UseParNewGC &&
1469 FLAG_IS_DEFAULT(UseParallelGC)) {
1470 if (should_auto_select_low_pause_collector()) {
1471 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1472 } else {
1473 FLAG_SET_ERGO(bool, UseParallelGC, true);
1474 }
1475 }
1476 // Shared spaces work fine with other GCs but causes bytecode rewriting
1477 // to be disabled, which hurts interpreter performance and decreases
1478 // server performance. On server class machines, keep the default
1479 // off unless it is asked for. Future work: either add bytecode rewriting
1480 // at link time, or rewrite bytecodes in non-shared methods.
1481 if (!DumpSharedSpaces && !RequireSharedSpaces) {
1482 no_shared_spaces();
1483 }
1484 }
1485
1486 set_max_heap_alignment();
1487
1488 #ifndef ZERO
1489 #ifdef _LP64
1490 set_use_compressed_oops();
1491 // UseCompressedOops must be on for UseCompressedKlassPointers to be on.
1492 if (!UseCompressedOops) {
1493 if (UseCompressedKlassPointers) {
1494 warning("UseCompressedKlassPointers requires UseCompressedOops");
1495 }
1496 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1497 } else {
1498 // Turn on UseCompressedKlassPointers too
1499 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) {
1500 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true);
1501 }
1502 // Set the ClassMetaspaceSize to something that will not need to be
1503 // expanded, since it cannot be expanded.
1504 if (UseCompressedKlassPointers) {
1505 if (ClassMetaspaceSize > KlassEncodingMetaspaceMax) {
1506 warning("Class metaspace size is too large for UseCompressedKlassPointers");
1507 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1508 } else if (apply_ergonomics_on_classmetaspacesize()) {
1509 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, ErgoClassMetaspaceSize);
1510 }
1511 }
1512 }
1513 // Also checks that certain machines are slower with compressed oops
1514 // in vm_version initialization code.
1515 #endif // _LP64
1516 #endif // !ZERO
1517 }
1518
1519 void Arguments::set_parallel_gc_flags() {
1520 assert(UseParallelGC || UseParallelOldGC, "Error");
1521 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1522 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1523 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1524 }
1525 FLAG_SET_DEFAULT(UseParallelGC, true);
1526
1527 // If no heap maximum was requested explicitly, use some reasonable fraction
1528 // of the physical memory, up to a maximum of 1GB.
1529 FLAG_SET_DEFAULT(ParallelGCThreads,
1530 Abstract_VM_Version::parallel_worker_threads());
1531 if (ParallelGCThreads == 0) {
1532 jio_fprintf(defaultStream::error_stream(),
1533 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1534 vm_exit(1);
1535 }
1536
1537
1538 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1539 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1540 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1541 // See CR 6362902 for details.
1542 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1543 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1544 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1545 }
1546 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1547 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1548 }
1549 }
1550
1551 if (UseParallelOldGC) {
1552 // Par compact uses lower default values since they are treated as
1553 // minimums. These are different defaults because of the different
1554 // interpretation and are not ergonomically set.
1555 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1556 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1557 }
1558 }
1559 }
1560
1561 void Arguments::set_g1_gc_flags() {
1562 assert(UseG1GC, "Error");
1563 #ifdef COMPILER1
1564 FastTLABRefill = false;
1565 #endif
1566 FLAG_SET_DEFAULT(ParallelGCThreads,
1567 Abstract_VM_Version::parallel_worker_threads());
1568 if (ParallelGCThreads == 0) {
1569 FLAG_SET_DEFAULT(ParallelGCThreads,
1570 Abstract_VM_Version::parallel_worker_threads());
1571 }
1572
1573 // MarkStackSize will be set (if it hasn't been set by the user)
1574 // when concurrent marking is initialized.
1575 // Its value will be based upon the number of parallel marking threads.
1576 // But we do set the maximum mark stack size here.
1577 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1578 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1579 }
1580
1581 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1582 // In G1, we want the default GC overhead goal to be higher than
1583 // say in PS. So we set it here to 10%. Otherwise the heap might
1584 // be expanded more aggressively than we would like it to. In
1585 // fact, even 10% seems to not be high enough in some cases
1586 // (especially small GC stress tests that the main thing they do
1587 // is allocation). We might consider increase it further.
1588 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1589 }
1590
1591 if (PrintGCDetails && Verbose) {
1592 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1593 MarkStackSize / K, MarkStackSizeMax / K);
1594 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1595 }
1596 }
1597
1598 julong Arguments::limit_by_allocatable_memory(julong limit) {
1599 julong max_allocatable;
1600 julong result = limit;
1601 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1602 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1603 }
1604 return result;
1605 }
1606
1607 void Arguments::set_heap_size() {
1608 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1609 // Deprecated flag
1610 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1611 }
1612
1613 const julong phys_mem =
1614 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1615 : (julong)MaxRAM;
1616
1617 // If the maximum heap size has not been set with -Xmx,
1618 // then set it as fraction of the size of physical memory,
1619 // respecting the maximum and minimum sizes of the heap.
1620 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1621 julong reasonable_max = phys_mem / MaxRAMFraction;
1622
1623 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1624 // Small physical memory, so use a minimum fraction of it for the heap
1625 reasonable_max = phys_mem / MinRAMFraction;
1626 } else {
1627 // Not-small physical memory, so require a heap at least
1628 // as large as MaxHeapSize
1629 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1630 }
1631 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1632 // Limit the heap size to ErgoHeapSizeLimit
1633 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1634 }
1635 if (UseCompressedOops) {
1636 // Limit the heap size to the maximum possible when using compressed oops
1637 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1638 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1639 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1640 // but it should be not less than default MaxHeapSize.
1641 max_coop_heap -= HeapBaseMinAddress;
1642 }
1643 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1644 }
1645 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1646
1647 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1648 // An initial heap size was specified on the command line,
1649 // so be sure that the maximum size is consistent. Done
1650 // after call to limit_by_allocatable_memory because that
1651 // method might reduce the allocation size.
1652 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1653 }
1654
1655 if (PrintGCDetails && Verbose) {
1656 // Cannot use gclog_or_tty yet.
1657 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1658 }
1659 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1660 }
1661
1662 // If the minimum or initial heap_size have not been set or requested to be set
1663 // ergonomically, set them accordingly.
1664 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1665 julong reasonable_minimum = (julong)(OldSize + NewSize);
1666
1667 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1668
1669 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1670
1671 if (InitialHeapSize == 0) {
1672 julong reasonable_initial = phys_mem / InitialRAMFraction;
1673
1674 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1675 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1676
1677 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1678
1679 if (PrintGCDetails && Verbose) {
1680 // Cannot use gclog_or_tty yet.
1681 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1682 }
1683 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1684 }
1685 // If the minimum heap size has not been set (via -Xms),
1686 // synchronize with InitialHeapSize to avoid errors with the default value.
1687 if (min_heap_size() == 0) {
1688 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1689 if (PrintGCDetails && Verbose) {
1690 // Cannot use gclog_or_tty yet.
1691 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1692 }
1693 }
1694 }
1695 }
1696
1697 // This must be called after ergonomics because we want bytecode rewriting
1698 // if the server compiler is used, or if UseSharedSpaces is disabled.
1699 void Arguments::set_bytecode_flags() {
1700 // Better not attempt to store into a read-only space.
1701 if (UseSharedSpaces) {
1702 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1703 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1704 }
1705
1706 if (!RewriteBytecodes) {
1707 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1708 }
1709 }
1710
1711 // Aggressive optimization flags -XX:+AggressiveOpts
1712 void Arguments::set_aggressive_opts_flags() {
1713 #ifdef COMPILER2
1714 if (AggressiveUnboxing) {
1715 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1716 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1717 } else if (!EliminateAutoBox) {
1718 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1719 AggressiveUnboxing = false;
1720 }
1721 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1722 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1723 } else if (!DoEscapeAnalysis) {
1724 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1725 AggressiveUnboxing = false;
1726 }
1727 }
1728 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1729 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1730 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1731 }
1732 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1733 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1734 }
1735
1736 // Feed the cache size setting into the JDK
1737 char buffer[1024];
1738 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1739 add_property(buffer);
1740 }
1741 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1742 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1743 }
1744 #endif
1745
1746 if (AggressiveOpts) {
1747 // Sample flag setting code
1748 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1749 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1750 // }
1751 }
1752 }
1753
1754 //===========================================================================================================
1755 // Parsing of java.compiler property
1756
1757 void Arguments::process_java_compiler_argument(char* arg) {
1758 // For backwards compatibility, Djava.compiler=NONE or ""
1759 // causes us to switch to -Xint mode UNLESS -Xdebug
1760 // is also specified.
1761 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1762 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1763 }
1764 }
1765
1766 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1767 _sun_java_launcher = strdup(launcher);
1768 if (strcmp("gamma", _sun_java_launcher) == 0) {
1769 _created_by_gamma_launcher = true;
1770 }
1771 }
1772
1773 bool Arguments::created_by_java_launcher() {
1774 assert(_sun_java_launcher != NULL, "property must have value");
1775 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1776 }
1777
1778 bool Arguments::created_by_gamma_launcher() {
1779 return _created_by_gamma_launcher;
1780 }
1781
1782 //===========================================================================================================
1783 // Parsing of main arguments
1784
1785 bool Arguments::verify_interval(uintx val, uintx min,
1786 uintx max, const char* name) {
1787 // Returns true iff value is in the inclusive interval [min..max]
1788 // false, otherwise.
1789 if (val >= min && val <= max) {
1790 return true;
1791 }
1792 jio_fprintf(defaultStream::error_stream(),
1793 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1794 " and " UINTX_FORMAT "\n",
1795 name, val, min, max);
1796 return false;
1797 }
1798
1799 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1800 // Returns true if given value is at least specified min threshold
1801 // false, otherwise.
1802 if (val >= min ) {
1803 return true;
1804 }
1805 jio_fprintf(defaultStream::error_stream(),
1806 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1807 name, val, min);
1808 return false;
1809 }
1810
1811 bool Arguments::verify_percentage(uintx value, const char* name) {
1812 if (value <= 100) {
1813 return true;
1814 }
1815 jio_fprintf(defaultStream::error_stream(),
1816 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1817 name, value);
1818 return false;
1819 }
1820
1821 #if !INCLUDE_ALL_GCS
1822 #ifdef ASSERT
1823 static bool verify_serial_gc_flags() {
1824 return (UseSerialGC &&
1825 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1826 UseParallelGC || UseParallelOldGC));
1827 }
1828 #endif // ASSERT
1829 #endif // INCLUDE_ALL_GCS
1830
1831 // check if do gclog rotation
1832 // +UseGCLogFileRotation is a must,
1833 // no gc log rotation when log file not supplied or
1834 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1835 void check_gclog_consistency() {
1836 if (UseGCLogFileRotation) {
1837 if ((Arguments::gc_log_filename() == NULL) ||
1838 (NumberOfGCLogFiles == 0) ||
1839 (GCLogFileSize == 0)) {
1840 jio_fprintf(defaultStream::output_stream(),
1841 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1842 "where num_of_file > 0 and num_of_size > 0\n"
1843 "GC log rotation is turned off\n");
1844 UseGCLogFileRotation = false;
1845 }
1846 }
1847
1848 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1849 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1850 jio_fprintf(defaultStream::output_stream(),
1851 "GCLogFileSize changed to minimum 8K\n");
1852 }
1853 }
1854
1855 // Check consistency of GC selection
1856 bool Arguments::check_gc_consistency() {
1857 check_gclog_consistency();
1858 bool status = true;
1859 // Ensure that the user has not selected conflicting sets
1860 // of collectors. [Note: this check is merely a user convenience;
1861 // collectors over-ride each other so that only a non-conflicting
1862 // set is selected; however what the user gets is not what they
1863 // may have expected from the combination they asked for. It's
1864 // better to reduce user confusion by not allowing them to
1865 // select conflicting combinations.
1866 uint i = 0;
1867 if (UseSerialGC) i++;
1868 if (UseConcMarkSweepGC || UseParNewGC) i++;
1869 if (UseParallelGC || UseParallelOldGC) i++;
1870 if (UseG1GC) i++;
1871 if (i > 1) {
1872 jio_fprintf(defaultStream::error_stream(),
1873 "Conflicting collector combinations in option list; "
1874 "please refer to the release notes for the combinations "
1875 "allowed\n");
1876 status = false;
1877 }
1878
1879 return status;
1880 }
1881
1882 void Arguments::check_deprecated_gcs() {
1883 if (UseConcMarkSweepGC && !UseParNewGC) {
1884 warning("Using the DefNew young collector with the CMS collector is deprecated "
1885 "and will likely be removed in a future release");
1886 }
1887
1888 if (UseParNewGC && !UseConcMarkSweepGC) {
1889 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
1890 // set up UseSerialGC properly, so that can't be used in the check here.
1891 warning("Using the ParNew young collector with the Serial old collector is deprecated "
1892 "and will likely be removed in a future release");
1893 }
1894
1895 if (CMSIncrementalMode) {
1896 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
1897 }
1898 }
1899
1900 void Arguments::check_deprecated_gc_flags() {
1901 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
1902 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
1903 "and will likely be removed in future release");
1904 }
1905 }
1906
1907 // Check stack pages settings
1908 bool Arguments::check_stack_pages()
1909 {
1910 bool status = true;
1911 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1912 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1913 // greater stack shadow pages can't generate instruction to bang stack
1914 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1915 return status;
1916 }
1917
1918 // Check the consistency of vm_init_args
1919 bool Arguments::check_vm_args_consistency() {
1920 // Method for adding checks for flag consistency.
1921 // The intent is to warn the user of all possible conflicts,
1922 // before returning an error.
1923 // Note: Needs platform-dependent factoring.
1924 bool status = true;
1925
1926 #if ( (defined(COMPILER2) && defined(SPARC)))
1927 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1928 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1929 // x86. Normally, VM_Version_init must be called from init_globals in
1930 // init.cpp, which is called by the initial java thread *after* arguments
1931 // have been parsed. VM_Version_init gets called twice on sparc.
1932 extern void VM_Version_init();
1933 VM_Version_init();
1934 if (!VM_Version::has_v9()) {
1935 jio_fprintf(defaultStream::error_stream(),
1936 "V8 Machine detected, Server requires V9\n");
1937 status = false;
1938 }
1939 #endif /* COMPILER2 && SPARC */
1940
1941 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1942 // builds so the cost of stack banging can be measured.
1943 #if (defined(PRODUCT) && defined(SOLARIS))
1944 if (!UseBoundThreads && !UseStackBanging) {
1945 jio_fprintf(defaultStream::error_stream(),
1946 "-UseStackBanging conflicts with -UseBoundThreads\n");
1947
1948 status = false;
1949 }
1950 #endif
1951
1952 if (TLABRefillWasteFraction == 0) {
1953 jio_fprintf(defaultStream::error_stream(),
1954 "TLABRefillWasteFraction should be a denominator, "
1955 "not " SIZE_FORMAT "\n",
1956 TLABRefillWasteFraction);
1957 status = false;
1958 }
1959
1960 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
1961 "AdaptiveSizePolicyWeight");
1962 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1963 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1964 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1965
1966 // Divide by bucket size to prevent a large size from causing rollover when
1967 // calculating amount of memory needed to be allocated for the String table.
1968 status = status && verify_interval(StringTableSize, minimumStringTableSize,
1969 (max_uintx / StringTable::bucket_size()), "StringTable size");
1970
1971 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1972 jio_fprintf(defaultStream::error_stream(),
1973 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1974 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1975 MinHeapFreeRatio, MaxHeapFreeRatio);
1976 status = false;
1977 }
1978 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1979 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1980
1981 // Min/MaxMetaspaceFreeRatio
1982 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
1983 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
1984
1985 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
1986 jio_fprintf(defaultStream::error_stream(),
1987 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
1988 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
1989 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
1990 MinMetaspaceFreeRatio,
1991 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
1992 MaxMetaspaceFreeRatio);
1993 status = false;
1994 }
1995
1996 // Trying to keep 100% free is not practical
1997 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
1998
1999 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2000 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2001 }
2002
2003 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2004 // Settings to encourage splitting.
2005 if (!FLAG_IS_CMDLINE(NewRatio)) {
2006 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2007 }
2008 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2009 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2010 }
2011 }
2012
2013 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2014 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2015 if (GCTimeLimit == 100) {
2016 // Turn off gc-overhead-limit-exceeded checks
2017 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2018 }
2019
2020 status = status && check_gc_consistency();
2021 status = status && check_stack_pages();
2022
2023 if (_has_alloc_profile) {
2024 if (UseParallelGC || UseParallelOldGC) {
2025 jio_fprintf(defaultStream::error_stream(),
2026 "error: invalid argument combination.\n"
2027 "Allocation profiling (-Xaprof) cannot be used together with "
2028 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
2029 status = false;
2030 }
2031 if (UseConcMarkSweepGC) {
2032 jio_fprintf(defaultStream::error_stream(),
2033 "error: invalid argument combination.\n"
2034 "Allocation profiling (-Xaprof) cannot be used together with "
2035 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
2036 status = false;
2037 }
2038 }
2039
2040 if (CMSIncrementalMode) {
2041 if (!UseConcMarkSweepGC) {
2042 jio_fprintf(defaultStream::error_stream(),
2043 "error: invalid argument combination.\n"
2044 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2045 "selected in order\nto use CMSIncrementalMode.\n");
2046 status = false;
2047 } else {
2048 status = status && verify_percentage(CMSIncrementalDutyCycle,
2049 "CMSIncrementalDutyCycle");
2050 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2051 "CMSIncrementalDutyCycleMin");
2052 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2053 "CMSIncrementalSafetyFactor");
2054 status = status && verify_percentage(CMSIncrementalOffset,
2055 "CMSIncrementalOffset");
2056 status = status && verify_percentage(CMSExpAvgFactor,
2057 "CMSExpAvgFactor");
2058 // If it was not set on the command line, set
2059 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2060 if (CMSInitiatingOccupancyFraction < 0) {
2061 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2062 }
2063 }
2064 }
2065
2066 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2067 // insists that we hold the requisite locks so that the iteration is
2068 // MT-safe. For the verification at start-up and shut-down, we don't
2069 // yet have a good way of acquiring and releasing these locks,
2070 // which are not visible at the CollectedHeap level. We want to
2071 // be able to acquire these locks and then do the iteration rather
2072 // than just disable the lock verification. This will be fixed under
2073 // bug 4788986.
2074 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2075 if (VerifyDuringStartup) {
2076 warning("Heap verification at start-up disabled "
2077 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2078 VerifyDuringStartup = false; // Disable verification at start-up
2079 }
2080
2081 if (VerifyBeforeExit) {
2082 warning("Heap verification at shutdown disabled "
2083 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2084 VerifyBeforeExit = false; // Disable verification at shutdown
2085 }
2086 }
2087
2088 // Note: only executed in non-PRODUCT mode
2089 if (!UseAsyncConcMarkSweepGC &&
2090 (ExplicitGCInvokesConcurrent ||
2091 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2092 jio_fprintf(defaultStream::error_stream(),
2093 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2094 " with -UseAsyncConcMarkSweepGC");
2095 status = false;
2096 }
2097
2098 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2099
2100 #if INCLUDE_ALL_GCS
2101 if (UseG1GC) {
2102 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2103 "InitiatingHeapOccupancyPercent");
2104 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2105 "G1RefProcDrainInterval");
2106 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2107 "G1ConcMarkStepDurationMillis");
2108 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2109 "G1ConcRSHotCardLimit");
2110 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2111 "G1ConcRSLogCacheSize");
2112 }
2113 if (UseConcMarkSweepGC) {
2114 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2115 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2116 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2117 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2118
2119 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2120
2121 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2122 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2123 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2124
2125 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2126
2127 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2128 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2129
2130 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2131 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2132 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2133
2134 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2135
2136 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2137
2138 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2139 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2140 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2141 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2142 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2143 }
2144
2145 if (UseParallelGC || UseParallelOldGC) {
2146 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2147 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2148
2149 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2150 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2151
2152 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2153 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2154
2155 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2156
2157 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2158 }
2159 #endif // INCLUDE_ALL_GCS
2160
2161 status = status && verify_interval(RefDiscoveryPolicy,
2162 ReferenceProcessor::DiscoveryPolicyMin,
2163 ReferenceProcessor::DiscoveryPolicyMax,
2164 "RefDiscoveryPolicy");
2165
2166 // Limit the lower bound of this flag to 1 as it is used in a division
2167 // expression.
2168 status = status && verify_interval(TLABWasteTargetPercent,
2169 1, 100, "TLABWasteTargetPercent");
2170
2171 status = status && verify_object_alignment();
2172
2173 status = status && verify_min_value(ClassMetaspaceSize, 1*M,
2174 "ClassMetaspaceSize");
2175
2176 status = status && verify_interval(MarkStackSizeMax,
2177 1, (max_jint - 1), "MarkStackSizeMax");
2178 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2179
2180 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2181
2182 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2183
2184 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2185
2186 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2187 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2188
2189 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2190
2191 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2192 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2193 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2194 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2195
2196 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2197 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2198
2199 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2200 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2201 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2202
2203 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2204 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2205
2206 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2207 // just for that, so hardcode here.
2208 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2209 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2210 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2211 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2212
2213 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2214 #ifdef SPARC
2215 if (UseConcMarkSweepGC || UseG1GC) {
2216 // Issue a stern warning if the user has explicitly set
2217 // UseMemSetInBOT (it is known to cause issues), but allow
2218 // use for experimentation and debugging.
2219 if (VM_Version::is_sun4v() && UseMemSetInBOT) {
2220 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
2221 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
2222 " on sun4v; please understand that you are using at your own risk!");
2223 }
2224 }
2225 #endif // SPARC
2226
2227 if (PrintNMTStatistics) {
2228 #if INCLUDE_NMT
2229 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2230 #endif // INCLUDE_NMT
2231 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2232 PrintNMTStatistics = false;
2233 #if INCLUDE_NMT
2234 }
2235 #endif
2236 }
2237
2238 // Need to limit the extent of the padding to reasonable size.
2239 // 8K is well beyond the reasonable HW cache line size, even with the
2240 // aggressive prefetching, while still leaving the room for segregating
2241 // among the distinct pages.
2242 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2243 jio_fprintf(defaultStream::error_stream(),
2244 "ContendedPaddingWidth=" INTX_FORMAT " must be the between %d and %d\n",
2245 ContendedPaddingWidth, 0, 8192);
2246 status = false;
2247 }
2248
2249 // Need to enforce the padding not to break the existing field alignments.
2250 // It is sufficient to check against the largest type size.
2251 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2252 jio_fprintf(defaultStream::error_stream(),
2253 "ContendedPaddingWidth=" INTX_FORMAT " must be the multiple of %d\n",
2254 ContendedPaddingWidth, BytesPerLong);
2255 status = false;
2256 }
2257
2258 return status;
2259 }
2260
2261 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2262 const char* option_type) {
2263 if (ignore) return false;
2264
2265 const char* spacer = " ";
2266 if (option_type == NULL) {
2267 option_type = ++spacer; // Set both to the empty string.
2268 }
2269
2270 if (os::obsolete_option(option)) {
2271 jio_fprintf(defaultStream::error_stream(),
2272 "Obsolete %s%soption: %s\n", option_type, spacer,
2273 option->optionString);
2274 return false;
2275 } else {
2276 jio_fprintf(defaultStream::error_stream(),
2277 "Unrecognized %s%soption: %s\n", option_type, spacer,
2278 option->optionString);
2279 return true;
2280 }
2281 }
2282
2283 static const char* user_assertion_options[] = {
2284 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2285 };
2286
2287 static const char* system_assertion_options[] = {
2288 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2289 };
2290
2291 // Return true if any of the strings in null-terminated array 'names' matches.
2292 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2293 // the option must match exactly.
2294 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2295 bool tail_allowed) {
2296 for (/* empty */; *names != NULL; ++names) {
2297 if (match_option(option, *names, tail)) {
2298 if (**tail == '\0' || tail_allowed && **tail == ':') {
2299 return true;
2300 }
2301 }
2302 }
2303 return false;
2304 }
2305
2306 bool Arguments::parse_uintx(const char* value,
2307 uintx* uintx_arg,
2308 uintx min_size) {
2309
2310 // Check the sign first since atomull() parses only unsigned values.
2311 bool value_is_positive = !(*value == '-');
2312
2313 if (value_is_positive) {
2314 julong n;
2315 bool good_return = atomull(value, &n);
2316 if (good_return) {
2317 bool above_minimum = n >= min_size;
2318 bool value_is_too_large = n > max_uintx;
2319
2320 if (above_minimum && !value_is_too_large) {
2321 *uintx_arg = n;
2322 return true;
2323 }
2324 }
2325 }
2326 return false;
2327 }
2328
2329 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2330 julong* long_arg,
2331 julong min_size) {
2332 if (!atomull(s, long_arg)) return arg_unreadable;
2333 return check_memory_size(*long_arg, min_size);
2334 }
2335
2336 // Parse JavaVMInitArgs structure
2337
2338 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2339 // For components of the system classpath.
2340 SysClassPath scp(Arguments::get_sysclasspath());
2341 bool scp_assembly_required = false;
2342
2343 // Save default settings for some mode flags
2344 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2345 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2346 Arguments::_ClipInlining = ClipInlining;
2347 Arguments::_BackgroundCompilation = BackgroundCompilation;
2348
2349 // Setup flags for mixed which is the default
2350 set_mode_flags(_mixed);
2351
2352 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2353 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2354 if (result != JNI_OK) {
2355 return result;
2356 }
2357
2358 // Parse JavaVMInitArgs structure passed in
2359 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2360 if (result != JNI_OK) {
2361 return result;
2362 }
2363
2364 if (AggressiveOpts) {
2365 // Insert alt-rt.jar between user-specified bootclasspath
2366 // prefix and the default bootclasspath. os::set_boot_path()
2367 // uses meta_index_dir as the default bootclasspath directory.
2368 const char* altclasses_jar = "alt-rt.jar";
2369 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2370 strlen(altclasses_jar);
2371 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal);
2372 strcpy(altclasses_path, get_meta_index_dir());
2373 strcat(altclasses_path, altclasses_jar);
2374 scp.add_suffix_to_prefix(altclasses_path);
2375 scp_assembly_required = true;
2376 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal);
2377 }
2378
2379 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2380 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2381 if (result != JNI_OK) {
2382 return result;
2383 }
2384
2385 // Do final processing now that all arguments have been parsed
2386 result = finalize_vm_init_args(&scp, scp_assembly_required);
2387 if (result != JNI_OK) {
2388 return result;
2389 }
2390
2391 return JNI_OK;
2392 }
2393
2394 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2395 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2396 // are dealing with -agentpath (case where name is a path), otherwise with
2397 // -agentlib
2398 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2399 char *_name;
2400 const char *_hprof = "hprof", *_jdwp = "jdwp";
2401 size_t _len_hprof, _len_jdwp, _len_prefix;
2402
2403 if (is_path) {
2404 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2405 return false;
2406 }
2407
2408 _name++; // skip past last path separator
2409 _len_prefix = strlen(JNI_LIB_PREFIX);
2410
2411 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2412 return false;
2413 }
2414
2415 _name += _len_prefix;
2416 _len_hprof = strlen(_hprof);
2417 _len_jdwp = strlen(_jdwp);
2418
2419 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2420 _name += _len_hprof;
2421 }
2422 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2423 _name += _len_jdwp;
2424 }
2425 else {
2426 return false;
2427 }
2428
2429 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2430 return false;
2431 }
2432
2433 return true;
2434 }
2435
2436 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2437 return true;
2438 }
2439
2440 return false;
2441 }
2442
2443 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2444 SysClassPath* scp_p,
2445 bool* scp_assembly_required_p,
2446 FlagValueOrigin origin) {
2447 // Remaining part of option string
2448 const char* tail;
2449
2450 // iterate over arguments
2451 for (int index = 0; index < args->nOptions; index++) {
2452 bool is_absolute_path = false; // for -agentpath vs -agentlib
2453
2454 const JavaVMOption* option = args->options + index;
2455
2456 if (!match_option(option, "-Djava.class.path", &tail) &&
2457 !match_option(option, "-Dsun.java.command", &tail) &&
2458 !match_option(option, "-Dsun.java.launcher", &tail)) {
2459
2460 // add all jvm options to the jvm_args string. This string
2461 // is used later to set the java.vm.args PerfData string constant.
2462 // the -Djava.class.path and the -Dsun.java.command options are
2463 // omitted from jvm_args string as each have their own PerfData
2464 // string constant object.
2465 build_jvm_args(option->optionString);
2466 }
2467
2468 // -verbose:[class/gc/jni]
2469 if (match_option(option, "-verbose", &tail)) {
2470 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2471 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2472 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2473 } else if (!strcmp(tail, ":gc")) {
2474 FLAG_SET_CMDLINE(bool, PrintGC, true);
2475 } else if (!strcmp(tail, ":jni")) {
2476 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2477 }
2478 // -da / -ea / -disableassertions / -enableassertions
2479 // These accept an optional class/package name separated by a colon, e.g.,
2480 // -da:java.lang.Thread.
2481 } else if (match_option(option, user_assertion_options, &tail, true)) {
2482 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2483 if (*tail == '\0') {
2484 JavaAssertions::setUserClassDefault(enable);
2485 } else {
2486 assert(*tail == ':', "bogus match by match_option()");
2487 JavaAssertions::addOption(tail + 1, enable);
2488 }
2489 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2490 } else if (match_option(option, system_assertion_options, &tail, false)) {
2491 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2492 JavaAssertions::setSystemClassDefault(enable);
2493 // -bootclasspath:
2494 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2495 scp_p->reset_path(tail);
2496 *scp_assembly_required_p = true;
2497 // -bootclasspath/a:
2498 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2499 scp_p->add_suffix(tail);
2500 *scp_assembly_required_p = true;
2501 // -bootclasspath/p:
2502 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2503 scp_p->add_prefix(tail);
2504 *scp_assembly_required_p = true;
2505 // -Xrun
2506 } else if (match_option(option, "-Xrun", &tail)) {
2507 if (tail != NULL) {
2508 const char* pos = strchr(tail, ':');
2509 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2510 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2511 name[len] = '\0';
2512
2513 char *options = NULL;
2514 if(pos != NULL) {
2515 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2516 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2517 }
2518 #if !INCLUDE_JVMTI
2519 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2520 jio_fprintf(defaultStream::error_stream(),
2521 "Profiling and debugging agents are not supported in this VM\n");
2522 return JNI_ERR;
2523 }
2524 #endif // !INCLUDE_JVMTI
2525 add_init_library(name, options);
2526 }
2527 // -agentlib and -agentpath
2528 } else if (match_option(option, "-agentlib:", &tail) ||
2529 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2530 if(tail != NULL) {
2531 const char* pos = strchr(tail, '=');
2532 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2533 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2534 name[len] = '\0';
2535
2536 char *options = NULL;
2537 if(pos != NULL) {
2538 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2539 }
2540 #if !INCLUDE_JVMTI
2541 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2542 jio_fprintf(defaultStream::error_stream(),
2543 "Profiling and debugging agents are not supported in this VM\n");
2544 return JNI_ERR;
2545 }
2546 #endif // !INCLUDE_JVMTI
2547 add_init_agent(name, options, is_absolute_path);
2548 }
2549 // -javaagent
2550 } else if (match_option(option, "-javaagent:", &tail)) {
2551 #if !INCLUDE_JVMTI
2552 jio_fprintf(defaultStream::error_stream(),
2553 "Instrumentation agents are not supported in this VM\n");
2554 return JNI_ERR;
2555 #else
2556 if(tail != NULL) {
2557 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2558 add_init_agent("instrument", options, false);
2559 }
2560 #endif // !INCLUDE_JVMTI
2561 // -Xnoclassgc
2562 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2563 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2564 // -Xincgc: i-CMS
2565 } else if (match_option(option, "-Xincgc", &tail)) {
2566 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2567 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2568 // -Xnoincgc: no i-CMS
2569 } else if (match_option(option, "-Xnoincgc", &tail)) {
2570 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2571 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2572 // -Xconcgc
2573 } else if (match_option(option, "-Xconcgc", &tail)) {
2574 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2575 // -Xnoconcgc
2576 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2577 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2578 // -Xbatch
2579 } else if (match_option(option, "-Xbatch", &tail)) {
2580 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2581 // -Xmn for compatibility with other JVM vendors
2582 } else if (match_option(option, "-Xmn", &tail)) {
2583 julong long_initial_eden_size = 0;
2584 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2585 if (errcode != arg_in_range) {
2586 jio_fprintf(defaultStream::error_stream(),
2587 "Invalid initial eden size: %s\n", option->optionString);
2588 describe_range_error(errcode);
2589 return JNI_EINVAL;
2590 }
2591 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2592 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2593 // -Xms
2594 } else if (match_option(option, "-Xms", &tail)) {
2595 julong long_initial_heap_size = 0;
2596 // an initial heap size of 0 means automatically determine
2597 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2598 if (errcode != arg_in_range) {
2599 jio_fprintf(defaultStream::error_stream(),
2600 "Invalid initial heap size: %s\n", option->optionString);
2601 describe_range_error(errcode);
2602 return JNI_EINVAL;
2603 }
2604 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2605 // Currently the minimum size and the initial heap sizes are the same.
2606 set_min_heap_size(InitialHeapSize);
2607 // -Xmx
2608 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2609 julong long_max_heap_size = 0;
2610 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2611 if (errcode != arg_in_range) {
2612 jio_fprintf(defaultStream::error_stream(),
2613 "Invalid maximum heap size: %s\n", option->optionString);
2614 describe_range_error(errcode);
2615 return JNI_EINVAL;
2616 }
2617 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2618 // Xmaxf
2619 } else if (match_option(option, "-Xmaxf", &tail)) {
2620 int maxf = (int)(atof(tail) * 100);
2621 if (maxf < 0 || maxf > 100) {
2622 jio_fprintf(defaultStream::error_stream(),
2623 "Bad max heap free percentage size: %s\n",
2624 option->optionString);
2625 return JNI_EINVAL;
2626 } else {
2627 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2628 }
2629 // Xminf
2630 } else if (match_option(option, "-Xminf", &tail)) {
2631 int minf = (int)(atof(tail) * 100);
2632 if (minf < 0 || minf > 100) {
2633 jio_fprintf(defaultStream::error_stream(),
2634 "Bad min heap free percentage size: %s\n",
2635 option->optionString);
2636 return JNI_EINVAL;
2637 } else {
2638 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2639 }
2640 // -Xss
2641 } else if (match_option(option, "-Xss", &tail)) {
2642 julong long_ThreadStackSize = 0;
2643 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2644 if (errcode != arg_in_range) {
2645 jio_fprintf(defaultStream::error_stream(),
2646 "Invalid thread stack size: %s\n", option->optionString);
2647 describe_range_error(errcode);
2648 return JNI_EINVAL;
2649 }
2650 // Internally track ThreadStackSize in units of 1024 bytes.
2651 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2652 round_to((int)long_ThreadStackSize, K) / K);
2653 // -Xoss
2654 } else if (match_option(option, "-Xoss", &tail)) {
2655 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2656 // -Xmaxjitcodesize
2657 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2658 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2659 julong long_ReservedCodeCacheSize = 0;
2660 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2661 (size_t)InitialCodeCacheSize);
2662 if (errcode != arg_in_range) {
2663 jio_fprintf(defaultStream::error_stream(),
2664 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2665 option->optionString, InitialCodeCacheSize/K);
2666 describe_range_error(errcode);
2667 return JNI_EINVAL;
2668 }
2669 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2670 //-XX:IncreaseFirstTierCompileThresholdAt=
2671 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2672 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2673 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2674 jio_fprintf(defaultStream::error_stream(),
2675 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2676 option->optionString);
2677 return JNI_EINVAL;
2678 }
2679 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2680 // -green
2681 } else if (match_option(option, "-green", &tail)) {
2682 jio_fprintf(defaultStream::error_stream(),
2683 "Green threads support not available\n");
2684 return JNI_EINVAL;
2685 // -native
2686 } else if (match_option(option, "-native", &tail)) {
2687 // HotSpot always uses native threads, ignore silently for compatibility
2688 // -Xsqnopause
2689 } else if (match_option(option, "-Xsqnopause", &tail)) {
2690 // EVM option, ignore silently for compatibility
2691 // -Xrs
2692 } else if (match_option(option, "-Xrs", &tail)) {
2693 // Classic/EVM option, new functionality
2694 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2695 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2696 // change default internal VM signals used - lower case for back compat
2697 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2698 // -Xoptimize
2699 } else if (match_option(option, "-Xoptimize", &tail)) {
2700 // EVM option, ignore silently for compatibility
2701 // -Xprof
2702 } else if (match_option(option, "-Xprof", &tail)) {
2703 #if INCLUDE_FPROF
2704 _has_profile = true;
2705 #else // INCLUDE_FPROF
2706 jio_fprintf(defaultStream::error_stream(),
2707 "Flat profiling is not supported in this VM.\n");
2708 return JNI_ERR;
2709 #endif // INCLUDE_FPROF
2710 // -Xaprof
2711 } else if (match_option(option, "-Xaprof", &tail)) {
2712 _has_alloc_profile = true;
2713 // -Xconcurrentio
2714 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2715 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2716 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2717 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2718 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2719 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2720
2721 // -Xinternalversion
2722 } else if (match_option(option, "-Xinternalversion", &tail)) {
2723 jio_fprintf(defaultStream::output_stream(), "%s\n",
2724 VM_Version::internal_vm_info_string());
2725 vm_exit(0);
2726 #ifndef PRODUCT
2727 // -Xprintflags
2728 } else if (match_option(option, "-Xprintflags", &tail)) {
2729 CommandLineFlags::printFlags(tty, false);
2730 vm_exit(0);
2731 #endif
2732 // -D
2733 } else if (match_option(option, "-D", &tail)) {
2734 if (!add_property(tail)) {
2735 return JNI_ENOMEM;
2736 }
2737 // Out of the box management support
2738 if (match_option(option, "-Dcom.sun.management", &tail)) {
2739 #if INCLUDE_MANAGEMENT
2740 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2741 #else
2742 jio_fprintf(defaultStream::output_stream(),
2743 "-Dcom.sun.management is not supported in this VM.\n");
2744 return JNI_ERR;
2745 #endif
2746 }
2747 // -Xint
2748 } else if (match_option(option, "-Xint", &tail)) {
2749 set_mode_flags(_int);
2750 // -Xmixed
2751 } else if (match_option(option, "-Xmixed", &tail)) {
2752 set_mode_flags(_mixed);
2753 // -Xcomp
2754 } else if (match_option(option, "-Xcomp", &tail)) {
2755 // for testing the compiler; turn off all flags that inhibit compilation
2756 set_mode_flags(_comp);
2757 // -Xshare:dump
2758 } else if (match_option(option, "-Xshare:dump", &tail)) {
2759 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2760 set_mode_flags(_int); // Prevent compilation, which creates objects
2761 // -Xshare:on
2762 } else if (match_option(option, "-Xshare:on", &tail)) {
2763 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2764 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2765 // -Xshare:auto
2766 } else if (match_option(option, "-Xshare:auto", &tail)) {
2767 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2768 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2769 // -Xshare:off
2770 } else if (match_option(option, "-Xshare:off", &tail)) {
2771 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2772 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2773 // -Xverify
2774 } else if (match_option(option, "-Xverify", &tail)) {
2775 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2776 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2777 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2778 } else if (strcmp(tail, ":remote") == 0) {
2779 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2780 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2781 } else if (strcmp(tail, ":none") == 0) {
2782 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2783 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2784 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2785 return JNI_EINVAL;
2786 }
2787 // -Xdebug
2788 } else if (match_option(option, "-Xdebug", &tail)) {
2789 // note this flag has been used, then ignore
2790 set_xdebug_mode(true);
2791 // -Xnoagent
2792 } else if (match_option(option, "-Xnoagent", &tail)) {
2793 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2794 } else if (match_option(option, "-Xboundthreads", &tail)) {
2795 // Bind user level threads to kernel threads (Solaris only)
2796 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2797 } else if (match_option(option, "-Xloggc:", &tail)) {
2798 // Redirect GC output to the file. -Xloggc:<filename>
2799 // ostream_init_log(), when called will use this filename
2800 // to initialize a fileStream.
2801 _gc_log_filename = strdup(tail);
2802 FLAG_SET_CMDLINE(bool, PrintGC, true);
2803 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2804
2805 // JNI hooks
2806 } else if (match_option(option, "-Xcheck", &tail)) {
2807 if (!strcmp(tail, ":jni")) {
2808 #if !INCLUDE_JNI_CHECK
2809 warning("JNI CHECKING is not supported in this VM");
2810 #else
2811 CheckJNICalls = true;
2812 #endif // INCLUDE_JNI_CHECK
2813 } else if (is_bad_option(option, args->ignoreUnrecognized,
2814 "check")) {
2815 return JNI_EINVAL;
2816 }
2817 } else if (match_option(option, "vfprintf", &tail)) {
2818 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2819 } else if (match_option(option, "exit", &tail)) {
2820 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2821 } else if (match_option(option, "abort", &tail)) {
2822 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2823 // -XX:+AggressiveHeap
2824 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2825
2826 // This option inspects the machine and attempts to set various
2827 // parameters to be optimal for long-running, memory allocation
2828 // intensive jobs. It is intended for machines with large
2829 // amounts of cpu and memory.
2830
2831 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2832 // VM, but we may not be able to represent the total physical memory
2833 // available (like having 8gb of memory on a box but using a 32bit VM).
2834 // Thus, we need to make sure we're using a julong for intermediate
2835 // calculations.
2836 julong initHeapSize;
2837 julong total_memory = os::physical_memory();
2838
2839 if (total_memory < (julong)256*M) {
2840 jio_fprintf(defaultStream::error_stream(),
2841 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2842 vm_exit(1);
2843 }
2844
2845 // The heap size is half of available memory, or (at most)
2846 // all of possible memory less 160mb (leaving room for the OS
2847 // when using ISM). This is the maximum; because adaptive sizing
2848 // is turned on below, the actual space used may be smaller.
2849
2850 initHeapSize = MIN2(total_memory / (julong)2,
2851 total_memory - (julong)160*M);
2852
2853 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2854
2855 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2856 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2857 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2858 // Currently the minimum size and the initial heap sizes are the same.
2859 set_min_heap_size(initHeapSize);
2860 }
2861 if (FLAG_IS_DEFAULT(NewSize)) {
2862 // Make the young generation 3/8ths of the total heap.
2863 FLAG_SET_CMDLINE(uintx, NewSize,
2864 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2865 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2866 }
2867
2868 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2869 FLAG_SET_DEFAULT(UseLargePages, true);
2870 #endif
2871
2872 // Increase some data structure sizes for efficiency
2873 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2874 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2875 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2876
2877 // See the OldPLABSize comment below, but replace 'after promotion'
2878 // with 'after copying'. YoungPLABSize is the size of the survivor
2879 // space per-gc-thread buffers. The default is 4kw.
2880 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2881
2882 // OldPLABSize is the size of the buffers in the old gen that
2883 // UseParallelGC uses to promote live data that doesn't fit in the
2884 // survivor spaces. At any given time, there's one for each gc thread.
2885 // The default size is 1kw. These buffers are rarely used, since the
2886 // survivor spaces are usually big enough. For specjbb, however, there
2887 // are occasions when there's lots of live data in the young gen
2888 // and we end up promoting some of it. We don't have a definite
2889 // explanation for why bumping OldPLABSize helps, but the theory
2890 // is that a bigger PLAB results in retaining something like the
2891 // original allocation order after promotion, which improves mutator
2892 // locality. A minor effect may be that larger PLABs reduce the
2893 // number of PLAB allocation events during gc. The value of 8kw
2894 // was arrived at by experimenting with specjbb.
2895 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2896
2897 // Enable parallel GC and adaptive generation sizing
2898 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2899 FLAG_SET_DEFAULT(ParallelGCThreads,
2900 Abstract_VM_Version::parallel_worker_threads());
2901
2902 // Encourage steady state memory management
2903 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2904
2905 // This appears to improve mutator locality
2906 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2907
2908 // Get around early Solaris scheduling bug
2909 // (affinity vs other jobs on system)
2910 // but disallow DR and offlining (5008695).
2911 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2912
2913 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2914 // The last option must always win.
2915 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2916 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2917 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2918 // The last option must always win.
2919 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2920 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2921 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2922 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2923 jio_fprintf(defaultStream::error_stream(),
2924 "Please use CMSClassUnloadingEnabled in place of "
2925 "CMSPermGenSweepingEnabled in the future\n");
2926 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2927 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2928 jio_fprintf(defaultStream::error_stream(),
2929 "Please use -XX:+UseGCOverheadLimit in place of "
2930 "-XX:+UseGCTimeLimit in the future\n");
2931 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2932 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2933 jio_fprintf(defaultStream::error_stream(),
2934 "Please use -XX:-UseGCOverheadLimit in place of "
2935 "-XX:-UseGCTimeLimit in the future\n");
2936 // The TLE options are for compatibility with 1.3 and will be
2937 // removed without notice in a future release. These options
2938 // are not to be documented.
2939 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2940 // No longer used.
2941 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2942 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2943 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2944 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2945 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2946 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2947 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2948 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2949 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2950 // No longer used.
2951 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2952 julong long_tlab_size = 0;
2953 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2954 if (errcode != arg_in_range) {
2955 jio_fprintf(defaultStream::error_stream(),
2956 "Invalid TLAB size: %s\n", option->optionString);
2957 describe_range_error(errcode);
2958 return JNI_EINVAL;
2959 }
2960 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2961 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2962 // No longer used.
2963 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2964 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2965 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2966 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2967 SOLARIS_ONLY(
2968 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2969 warning("-XX:+UsePermISM is obsolete.");
2970 FLAG_SET_CMDLINE(bool, UseISM, true);
2971 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2972 FLAG_SET_CMDLINE(bool, UseISM, false);
2973 )
2974 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2975 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2976 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2977 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2978 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2979 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2980 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2981 #if defined(DTRACE_ENABLED)
2982 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2983 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2984 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2985 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2986 #else // defined(DTRACE_ENABLED)
2987 jio_fprintf(defaultStream::error_stream(),
2988 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2989 return JNI_EINVAL;
2990 #endif // defined(DTRACE_ENABLED)
2991 #ifdef ASSERT
2992 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2993 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2994 // disable scavenge before parallel mark-compact
2995 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2996 #endif
2997 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2998 julong cms_blocks_to_claim = (julong)atol(tail);
2999 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3000 jio_fprintf(defaultStream::error_stream(),
3001 "Please use -XX:OldPLABSize in place of "
3002 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3003 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3004 julong cms_blocks_to_claim = (julong)atol(tail);
3005 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3006 jio_fprintf(defaultStream::error_stream(),
3007 "Please use -XX:OldPLABSize in place of "
3008 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3009 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3010 julong old_plab_size = 0;
3011 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3012 if (errcode != arg_in_range) {
3013 jio_fprintf(defaultStream::error_stream(),
3014 "Invalid old PLAB size: %s\n", option->optionString);
3015 describe_range_error(errcode);
3016 return JNI_EINVAL;
3017 }
3018 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3019 jio_fprintf(defaultStream::error_stream(),
3020 "Please use -XX:OldPLABSize in place of "
3021 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3022 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3023 julong young_plab_size = 0;
3024 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3025 if (errcode != arg_in_range) {
3026 jio_fprintf(defaultStream::error_stream(),
3027 "Invalid young PLAB size: %s\n", option->optionString);
3028 describe_range_error(errcode);
3029 return JNI_EINVAL;
3030 }
3031 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3032 jio_fprintf(defaultStream::error_stream(),
3033 "Please use -XX:YoungPLABSize in place of "
3034 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3035 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3036 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3037 julong stack_size = 0;
3038 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3039 if (errcode != arg_in_range) {
3040 jio_fprintf(defaultStream::error_stream(),
3041 "Invalid mark stack size: %s\n", option->optionString);
3042 describe_range_error(errcode);
3043 return JNI_EINVAL;
3044 }
3045 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3046 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3047 julong max_stack_size = 0;
3048 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3049 if (errcode != arg_in_range) {
3050 jio_fprintf(defaultStream::error_stream(),
3051 "Invalid maximum mark stack size: %s\n",
3052 option->optionString);
3053 describe_range_error(errcode);
3054 return JNI_EINVAL;
3055 }
3056 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3057 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3058 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3059 uintx conc_threads = 0;
3060 if (!parse_uintx(tail, &conc_threads, 1)) {
3061 jio_fprintf(defaultStream::error_stream(),
3062 "Invalid concurrent threads: %s\n", option->optionString);
3063 return JNI_EINVAL;
3064 }
3065 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3066 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3067 julong max_direct_memory_size = 0;
3068 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3069 if (errcode != arg_in_range) {
3070 jio_fprintf(defaultStream::error_stream(),
3071 "Invalid maximum direct memory size: %s\n",
3072 option->optionString);
3073 describe_range_error(errcode);
3074 return JNI_EINVAL;
3075 }
3076 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3077 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3078 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3079 // away and will cause VM initialization failures!
3080 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3081 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3082 #if !INCLUDE_MANAGEMENT
3083 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3084 jio_fprintf(defaultStream::error_stream(),
3085 "ManagementServer is not supported in this VM.\n");
3086 return JNI_ERR;
3087 #endif // INCLUDE_MANAGEMENT
3088 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3089 // Skip -XX:Flags= since that case has already been handled
3090 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3091 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3092 return JNI_EINVAL;
3093 }
3094 }
3095 // Unknown option
3096 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3097 return JNI_ERR;
3098 }
3099 }
3100
3101 // Change the default value for flags which have different default values
3102 // when working with older JDKs.
3103 #ifdef LINUX
3104 if (JDK_Version::current().compare_major(6) <= 0 &&
3105 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3106 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3107 }
3108 #endif // LINUX
3109 return JNI_OK;
3110 }
3111
3112 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3113 // This must be done after all -D arguments have been processed.
3114 scp_p->expand_endorsed();
3115
3116 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3117 // Assemble the bootclasspath elements into the final path.
3118 Arguments::set_sysclasspath(scp_p->combined_path());
3119 }
3120
3121 // This must be done after all arguments have been processed.
3122 // java_compiler() true means set to "NONE" or empty.
3123 if (java_compiler() && !xdebug_mode()) {
3124 // For backwards compatibility, we switch to interpreted mode if
3125 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3126 // not specified.
3127 set_mode_flags(_int);
3128 }
3129 if (CompileThreshold == 0) {
3130 set_mode_flags(_int);
3131 }
3132
3133 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3134 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3135 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3136 }
3137
3138 #ifndef COMPILER2
3139 // Don't degrade server performance for footprint
3140 if (FLAG_IS_DEFAULT(UseLargePages) &&
3141 MaxHeapSize < LargePageHeapSizeThreshold) {
3142 // No need for large granularity pages w/small heaps.
3143 // Note that large pages are enabled/disabled for both the
3144 // Java heap and the code cache.
3145 FLAG_SET_DEFAULT(UseLargePages, false);
3146 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
3147 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
3148 }
3149
3150 // Tiered compilation is undefined with C1.
3151 TieredCompilation = false;
3152 #else
3153 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3154 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3155 }
3156 #endif
3157
3158 // If we are running in a headless jre, force java.awt.headless property
3159 // to be true unless the property has already been set.
3160 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3161 if (os::is_headless_jre()) {
3162 const char* headless = Arguments::get_property("java.awt.headless");
3163 if (headless == NULL) {
3164 char envbuffer[128];
3165 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3166 if (!add_property("java.awt.headless=true")) {
3167 return JNI_ENOMEM;
3168 }
3169 } else {
3170 char buffer[256];
3171 strcpy(buffer, "java.awt.headless=");
3172 strcat(buffer, envbuffer);
3173 if (!add_property(buffer)) {
3174 return JNI_ENOMEM;
3175 }
3176 }
3177 }
3178 }
3179
3180 if (!check_vm_args_consistency()) {
3181 return JNI_ERR;
3182 }
3183
3184 return JNI_OK;
3185 }
3186
3187 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3188 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3189 scp_assembly_required_p);
3190 }
3191
3192 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3193 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3194 scp_assembly_required_p);
3195 }
3196
3197 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3198 const int N_MAX_OPTIONS = 64;
3199 const int OPTION_BUFFER_SIZE = 1024;
3200 char buffer[OPTION_BUFFER_SIZE];
3201
3202 // The variable will be ignored if it exceeds the length of the buffer.
3203 // Don't check this variable if user has special privileges
3204 // (e.g. unix su command).
3205 if (os::getenv(name, buffer, sizeof(buffer)) &&
3206 !os::have_special_privileges()) {
3207 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3208 jio_fprintf(defaultStream::error_stream(),
3209 "Picked up %s: %s\n", name, buffer);
3210 char* rd = buffer; // pointer to the input string (rd)
3211 int i;
3212 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3213 while (isspace(*rd)) rd++; // skip whitespace
3214 if (*rd == 0) break; // we re done when the input string is read completely
3215
3216 // The output, option string, overwrites the input string.
3217 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3218 // input string (rd).
3219 char* wrt = rd;
3220
3221 options[i++].optionString = wrt; // Fill in option
3222 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3223 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3224 int quote = *rd; // matching quote to look for
3225 rd++; // don't copy open quote
3226 while (*rd != quote) { // include everything (even spaces) up until quote
3227 if (*rd == 0) { // string termination means unmatched string
3228 jio_fprintf(defaultStream::error_stream(),
3229 "Unmatched quote in %s\n", name);
3230 return JNI_ERR;
3231 }
3232 *wrt++ = *rd++; // copy to option string
3233 }
3234 rd++; // don't copy close quote
3235 } else {
3236 *wrt++ = *rd++; // copy to option string
3237 }
3238 }
3239 // Need to check if we're done before writing a NULL,
3240 // because the write could be to the byte that rd is pointing to.
3241 if (*rd++ == 0) {
3242 *wrt = 0;
3243 break;
3244 }
3245 *wrt = 0; // Zero terminate option
3246 }
3247 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3248 JavaVMInitArgs vm_args;
3249 vm_args.version = JNI_VERSION_1_2;
3250 vm_args.options = options;
3251 vm_args.nOptions = i;
3252 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3253
3254 if (PrintVMOptions) {
3255 const char* tail;
3256 for (int i = 0; i < vm_args.nOptions; i++) {
3257 const JavaVMOption *option = vm_args.options + i;
3258 if (match_option(option, "-XX:", &tail)) {
3259 logOption(tail);
3260 }
3261 }
3262 }
3263
3264 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
3265 }
3266 return JNI_OK;
3267 }
3268
3269 void Arguments::set_shared_spaces_flags() {
3270 #ifdef _LP64
3271 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
3272
3273 // CompressedOops cannot be used with CDS. The offsets of oopmaps and
3274 // static fields are incorrect in the archive. With some more clever
3275 // initialization, this restriction can probably be lifted.
3276 if (UseCompressedOops) {
3277 if (must_share) {
3278 warning("disabling compressed oops because of %s",
3279 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
3280 FLAG_SET_CMDLINE(bool, UseCompressedOops, false);
3281 FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false);
3282 } else {
3283 // Prefer compressed oops to class data sharing
3284 if (UseSharedSpaces && Verbose) {
3285 warning("turning off use of shared archive because of compressed oops");
3286 }
3287 no_shared_spaces();
3288 }
3289 }
3290 #endif
3291
3292 if (DumpSharedSpaces) {
3293 if (RequireSharedSpaces) {
3294 warning("cannot dump shared archive while using shared archive");
3295 }
3296 UseSharedSpaces = false;
3297 }
3298 }
3299
3300 // Disable options not supported in this release, with a warning if they
3301 // were explicitly requested on the command-line
3302 #define UNSUPPORTED_OPTION(opt, description) \
3303 do { \
3304 if (opt) { \
3305 if (FLAG_IS_CMDLINE(opt)) { \
3306 warning(description " is disabled in this release."); \
3307 } \
3308 FLAG_SET_DEFAULT(opt, false); \
3309 } \
3310 } while(0)
3311
3312
3313 #define UNSUPPORTED_GC_OPTION(gc) \
3314 do { \
3315 if (gc) { \
3316 if (FLAG_IS_CMDLINE(gc)) { \
3317 warning(#gc " is not supported in this VM. Using Serial GC."); \
3318 } \
3319 FLAG_SET_DEFAULT(gc, false); \
3320 } \
3321 } while(0)
3322
3323 #if !INCLUDE_ALL_GCS
3324 static void force_serial_gc() {
3325 FLAG_SET_DEFAULT(UseSerialGC, true);
3326 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3327 UNSUPPORTED_GC_OPTION(UseG1GC);
3328 UNSUPPORTED_GC_OPTION(UseParallelGC);
3329 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3330 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3331 UNSUPPORTED_GC_OPTION(UseParNewGC);
3332 }
3333 #endif // INCLUDE_ALL_GCS
3334
3335 // Sharing support
3336 // Construct the path to the archive
3337 static char* get_shared_archive_path() {
3338 char *shared_archive_path;
3339 if (SharedArchiveFile == NULL) {
3340 char jvm_path[JVM_MAXPATHLEN];
3341 os::jvm_path(jvm_path, sizeof(jvm_path));
3342 char *end = strrchr(jvm_path, *os::file_separator());
3343 if (end != NULL) *end = '\0';
3344 size_t jvm_path_len = strlen(jvm_path);
3345 size_t file_sep_len = strlen(os::file_separator());
3346 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3347 file_sep_len + 20, mtInternal);
3348 if (shared_archive_path != NULL) {
3349 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3350 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3351 strncat(shared_archive_path, "classes.jsa", 11);
3352 }
3353 } else {
3354 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3355 if (shared_archive_path != NULL) {
3356 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3357 }
3358 }
3359 return shared_archive_path;
3360 }
3361
3362 // Parse entry point called from JNI_CreateJavaVM
3363
3364 jint Arguments::parse(const JavaVMInitArgs* args) {
3365
3366 // Remaining part of option string
3367 const char* tail;
3368
3369 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3370 const char* hotspotrc = ".hotspotrc";
3371 bool settings_file_specified = false;
3372 bool needs_hotspotrc_warning = false;
3373
3374 const char* flags_file;
3375 int index;
3376 for (index = 0; index < args->nOptions; index++) {
3377 const JavaVMOption *option = args->options + index;
3378 if (match_option(option, "-XX:Flags=", &tail)) {
3379 flags_file = tail;
3380 settings_file_specified = true;
3381 }
3382 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3383 PrintVMOptions = true;
3384 }
3385 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3386 PrintVMOptions = false;
3387 }
3388 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3389 IgnoreUnrecognizedVMOptions = true;
3390 }
3391 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3392 IgnoreUnrecognizedVMOptions = false;
3393 }
3394 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3395 CommandLineFlags::printFlags(tty, false);
3396 vm_exit(0);
3397 }
3398 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3399 #if INCLUDE_NMT
3400 MemTracker::init_tracking_options(tail);
3401 #else
3402 jio_fprintf(defaultStream::error_stream(),
3403 "Native Memory Tracking is not supported in this VM\n");
3404 return JNI_ERR;
3405 #endif
3406 }
3407
3408
3409 #ifndef PRODUCT
3410 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3411 CommandLineFlags::printFlags(tty, true);
3412 vm_exit(0);
3413 }
3414 #endif
3415 }
3416
3417 if (IgnoreUnrecognizedVMOptions) {
3418 // uncast const to modify the flag args->ignoreUnrecognized
3419 *(jboolean*)(&args->ignoreUnrecognized) = true;
3420 }
3421
3422 // Parse specified settings file
3423 if (settings_file_specified) {
3424 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3425 return JNI_EINVAL;
3426 }
3427 } else {
3428 #ifdef ASSERT
3429 // Parse default .hotspotrc settings file
3430 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3431 return JNI_EINVAL;
3432 }
3433 #else
3434 struct stat buf;
3435 if (os::stat(hotspotrc, &buf) == 0) {
3436 needs_hotspotrc_warning = true;
3437 }
3438 #endif
3439 }
3440
3441 if (PrintVMOptions) {
3442 for (index = 0; index < args->nOptions; index++) {
3443 const JavaVMOption *option = args->options + index;
3444 if (match_option(option, "-XX:", &tail)) {
3445 logOption(tail);
3446 }
3447 }
3448 }
3449
3450 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3451 jint result = parse_vm_init_args(args);
3452 if (result != JNI_OK) {
3453 return result;
3454 }
3455
3456 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3457 SharedArchivePath = get_shared_archive_path();
3458 if (SharedArchivePath == NULL) {
3459 return JNI_ENOMEM;
3460 }
3461
3462 // Delay warning until here so that we've had a chance to process
3463 // the -XX:-PrintWarnings flag
3464 if (needs_hotspotrc_warning) {
3465 warning("%s file is present but has been ignored. "
3466 "Run with -XX:Flags=%s to load the file.",
3467 hotspotrc, hotspotrc);
3468 }
3469
3470 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3471 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3472 #endif
3473
3474 #if INCLUDE_ALL_GCS
3475 #if (defined JAVASE_EMBEDDED || defined ARM)
3476 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3477 #endif
3478 #endif
3479
3480 #ifndef PRODUCT
3481 if (TraceBytecodesAt != 0) {
3482 TraceBytecodes = true;
3483 }
3484 if (CountCompiledCalls) {
3485 if (UseCounterDecay) {
3486 warning("UseCounterDecay disabled because CountCalls is set");
3487 UseCounterDecay = false;
3488 }
3489 }
3490 #endif // PRODUCT
3491
3492 // JSR 292 is not supported before 1.7
3493 if (!JDK_Version::is_gte_jdk17x_version()) {
3494 if (EnableInvokeDynamic) {
3495 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3496 warning("JSR 292 is not supported before 1.7. Disabling support.");
3497 }
3498 EnableInvokeDynamic = false;
3499 }
3500 }
3501
3502 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3503 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3504 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3505 }
3506 ScavengeRootsInCode = 1;
3507 }
3508
3509 if (PrintGCDetails) {
3510 // Turn on -verbose:gc options as well
3511 PrintGC = true;
3512 }
3513
3514 if (!JDK_Version::is_gte_jdk18x_version()) {
3515 // To avoid changing the log format for 7 updates this flag is only
3516 // true by default in JDK8 and above.
3517 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3518 FLAG_SET_DEFAULT(PrintGCCause, false);
3519 }
3520 }
3521
3522 // Set object alignment values.
3523 set_object_alignment();
3524
3525 #if !INCLUDE_ALL_GCS
3526 force_serial_gc();
3527 #endif // INCLUDE_ALL_GCS
3528 #if !INCLUDE_CDS
3529 if (DumpSharedSpaces || RequireSharedSpaces) {
3530 jio_fprintf(defaultStream::error_stream(),
3531 "Shared spaces are not supported in this VM\n");
3532 return JNI_ERR;
3533 }
3534 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3535 warning("Shared spaces are not supported in this VM");
3536 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3537 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3538 }
3539 no_shared_spaces();
3540 #endif // INCLUDE_CDS
3541
3542 // We need to initialize large page support here because ergonomics takes some
3543 // decisions depending on large page support and the calculated large page size.
3544 // Ergonomics may turn off large page support off later again.
3545 os::large_page_init();
3546
3547 // Set flags based on ergonomics.
3548 set_ergonomics_flags();
3549
3550 set_shared_spaces_flags();
3551
3552 // Check the GC selections again.
3553 if (!check_gc_consistency()) {
3554 return JNI_EINVAL;
3555 }
3556
3557 if (TieredCompilation) {
3558 set_tiered_flags();
3559 } else {
3560 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3561 if (CompilationPolicyChoice >= 2) {
3562 vm_exit_during_initialization(
3563 "Incompatible compilation policy selected", NULL);
3564 }
3565 }
3566
3567 // Set heap size based on available physical memory
3568 set_heap_size();
3569
3570 #if INCLUDE_ALL_GCS
3571 // Set per-collector flags
3572 if (UseParallelGC || UseParallelOldGC) {
3573 set_parallel_gc_flags();
3574 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3575 set_cms_and_parnew_gc_flags();
3576 } else if (UseParNewGC) { // skipped if CMS is set above
3577 set_parnew_gc_flags();
3578 } else if (UseG1GC) {
3579 set_g1_gc_flags();
3580 }
3581 check_deprecated_gcs();
3582 check_deprecated_gc_flags();
3583 if (AssumeMP && !UseSerialGC) {
3584 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3585 warning("If the number of processors is expected to increase from one, then"
3586 " you should configure the number of parallel GC threads appropriately"
3587 " using -XX:ParallelGCThreads=N");
3588 }
3589 }
3590 #else // INCLUDE_ALL_GCS
3591 assert(verify_serial_gc_flags(), "SerialGC unset");
3592 #endif // INCLUDE_ALL_GCS
3593
3594 // Set bytecode rewriting flags
3595 set_bytecode_flags();
3596
3597 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3598 set_aggressive_opts_flags();
3599
3600 // Turn off biased locking for locking debug mode flags,
3601 // which are subtlely different from each other but neither works with
3602 // biased locking.
3603 if (UseHeavyMonitors
3604 #ifdef COMPILER1
3605 || !UseFastLocking
3606 #endif // COMPILER1
3607 ) {
3608 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3609 // flag set to true on command line; warn the user that they
3610 // can't enable biased locking here
3611 warning("Biased Locking is not supported with locking debug flags"
3612 "; ignoring UseBiasedLocking flag." );
3613 }
3614 UseBiasedLocking = false;
3615 }
3616
3617 #ifdef CC_INTERP
3618 // Clear flags not supported by the C++ interpreter
3619 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3620 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3621 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3622 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false));
3623 #endif // CC_INTERP
3624
3625 #ifdef COMPILER2
3626 if (!UseBiasedLocking || EmitSync != 0) {
3627 UseOptoBiasInlining = false;
3628 }
3629 if (!EliminateLocks) {
3630 EliminateNestedLocks = false;
3631 }
3632 if (!Inline) {
3633 IncrementalInline = false;
3634 }
3635 #ifndef PRODUCT
3636 if (!IncrementalInline) {
3637 AlwaysIncrementalInline = false;
3638 }
3639 #endif
3640 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3641 // incremental inlining: bump MaxNodeLimit
3642 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3643 }
3644 #endif
3645
3646 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3647 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3648 DebugNonSafepoints = true;
3649 }
3650
3651 #ifndef PRODUCT
3652 if (CompileTheWorld) {
3653 // Force NmethodSweeper to sweep whole CodeCache each time.
3654 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3655 NmethodSweepFraction = 1;
3656 }
3657 }
3658 #endif
3659
3660 if (PrintCommandLineFlags) {
3661 CommandLineFlags::printSetFlags(tty);
3662 }
3663
3664 // Apply CPU specific policy for the BiasedLocking
3665 if (UseBiasedLocking) {
3666 if (!VM_Version::use_biased_locking() &&
3667 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3668 UseBiasedLocking = false;
3669 }
3670 }
3671
3672 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3673 // but only if not already set on the commandline
3674 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3675 bool set = false;
3676 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3677 if (!set) {
3678 FLAG_SET_DEFAULT(PauseAtExit, true);
3679 }
3680 }
3681
3682 return JNI_OK;
3683 }
3684
3685 jint Arguments::adjust_after_os() {
3686 #if INCLUDE_ALL_GCS
3687 if (UseParallelGC || UseParallelOldGC) {
3688 if (UseNUMA) {
3689 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3690 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3691 }
3692 // For those collectors or operating systems (eg, Windows) that do
3693 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3694 UseNUMAInterleaving = true;
3695 }
3696 }
3697 #endif // INCLUDE_ALL_GCS
3698 return JNI_OK;
3699 }
3700
3701 int Arguments::PropertyList_count(SystemProperty* pl) {
3702 int count = 0;
3703 while(pl != NULL) {
3704 count++;
3705 pl = pl->next();
3706 }
3707 return count;
3708 }
3709
3710 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3711 assert(key != NULL, "just checking");
3712 SystemProperty* prop;
3713 for (prop = pl; prop != NULL; prop = prop->next()) {
3714 if (strcmp(key, prop->key()) == 0) return prop->value();
3715 }
3716 return NULL;
3717 }
3718
3719 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3720 int count = 0;
3721 const char* ret_val = NULL;
3722
3723 while(pl != NULL) {
3724 if(count >= index) {
3725 ret_val = pl->key();
3726 break;
3727 }
3728 count++;
3729 pl = pl->next();
3730 }
3731
3732 return ret_val;
3733 }
3734
3735 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3736 int count = 0;
3737 char* ret_val = NULL;
3738
3739 while(pl != NULL) {
3740 if(count >= index) {
3741 ret_val = pl->value();
3742 break;
3743 }
3744 count++;
3745 pl = pl->next();
3746 }
3747
3748 return ret_val;
3749 }
3750
3751 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3752 SystemProperty* p = *plist;
3753 if (p == NULL) {
3754 *plist = new_p;
3755 } else {
3756 while (p->next() != NULL) {
3757 p = p->next();
3758 }
3759 p->set_next(new_p);
3760 }
3761 }
3762
3763 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3764 if (plist == NULL)
3765 return;
3766
3767 SystemProperty* new_p = new SystemProperty(k, v, true);
3768 PropertyList_add(plist, new_p);
3769 }
3770
3771 // This add maintains unique property key in the list.
3772 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3773 if (plist == NULL)
3774 return;
3775
3776 // If property key exist then update with new value.
3777 SystemProperty* prop;
3778 for (prop = *plist; prop != NULL; prop = prop->next()) {
3779 if (strcmp(k, prop->key()) == 0) {
3780 if (append) {
3781 prop->append_value(v);
3782 } else {
3783 prop->set_value(v);
3784 }
3785 return;
3786 }
3787 }
3788
3789 PropertyList_add(plist, k, v);
3790 }
3791
3792 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3793 // Returns true if all of the source pointed by src has been copied over to
3794 // the destination buffer pointed by buf. Otherwise, returns false.
3795 // Notes:
3796 // 1. If the length (buflen) of the destination buffer excluding the
3797 // NULL terminator character is not long enough for holding the expanded
3798 // pid characters, it also returns false instead of returning the partially
3799 // expanded one.
3800 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3801 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3802 char* buf, size_t buflen) {
3803 const char* p = src;
3804 char* b = buf;
3805 const char* src_end = &src[srclen];
3806 char* buf_end = &buf[buflen - 1];
3807
3808 while (p < src_end && b < buf_end) {
3809 if (*p == '%') {
3810 switch (*(++p)) {
3811 case '%': // "%%" ==> "%"
3812 *b++ = *p++;
3813 break;
3814 case 'p': { // "%p" ==> current process id
3815 // buf_end points to the character before the last character so
3816 // that we could write '\0' to the end of the buffer.
3817 size_t buf_sz = buf_end - b + 1;
3818 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3819
3820 // if jio_snprintf fails or the buffer is not long enough to hold
3821 // the expanded pid, returns false.
3822 if (ret < 0 || ret >= (int)buf_sz) {
3823 return false;
3824 } else {
3825 b += ret;
3826 assert(*b == '\0', "fail in copy_expand_pid");
3827 if (p == src_end && b == buf_end + 1) {
3828 // reach the end of the buffer.
3829 return true;
3830 }
3831 }
3832 p++;
3833 break;
3834 }
3835 default :
3836 *b++ = '%';
3837 }
3838 } else {
3839 *b++ = *p++;
3840 }
3841 }
3842 *b = '\0';
3843 return (p == src_end); // return false if not all of the source was copied
3844 }