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 #if INCLUDE_ALL_GCS
56 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
57 #endif // INCLUDE_ALL_GCS
58
59 // Note: This is a special bug reporting site for the JVM
60 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
61 #define DEFAULT_JAVA_LAUNCHER "generic"
62
63 char** Arguments::_jvm_flags_array = NULL;
64 int Arguments::_num_jvm_flags = 0;
65 char** Arguments::_jvm_args_array = NULL;
66 int Arguments::_num_jvm_args = 0;
67 char* Arguments::_java_command = NULL;
68 SystemProperty* Arguments::_system_properties = NULL;
69 const char* Arguments::_gc_log_filename = NULL;
70 bool Arguments::_has_profile = false;
71 uintx Arguments::_min_heap_size = 0;
72 Arguments::Mode Arguments::_mode = _mixed;
73 bool Arguments::_java_compiler = false;
74 bool Arguments::_xdebug_mode = false;
75 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
76 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
77 int Arguments::_sun_java_launcher_pid = -1;
78 bool Arguments::_created_by_gamma_launcher = false;
79
80 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
81 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
82 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
83 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
84 bool Arguments::_ClipInlining = ClipInlining;
85
86 char* Arguments::SharedArchivePath = NULL;
87
88 AgentLibraryList Arguments::_libraryList;
89 AgentLibraryList Arguments::_agentList;
90
91 abort_hook_t Arguments::_abort_hook = NULL;
92 exit_hook_t Arguments::_exit_hook = NULL;
93 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
94
95
96 SystemProperty *Arguments::_java_ext_dirs = NULL;
97 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
98 SystemProperty *Arguments::_sun_boot_library_path = NULL;
99 SystemProperty *Arguments::_java_library_path = NULL;
100 SystemProperty *Arguments::_java_home = NULL;
101 SystemProperty *Arguments::_java_class_path = NULL;
102 SystemProperty *Arguments::_sun_boot_class_path = NULL;
103
104 char* Arguments::_meta_index_path = NULL;
105 char* Arguments::_meta_index_dir = NULL;
106
107 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
108
109 static bool match_option(const JavaVMOption *option, const char* name,
110 const char** tail) {
111 int len = (int)strlen(name);
112 if (strncmp(option->optionString, name, len) == 0) {
113 *tail = option->optionString + len;
114 return true;
115 } else {
116 return false;
117 }
118 }
119
120 static void logOption(const char* opt) {
121 if (PrintVMOptions) {
122 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
123 }
124 }
125
126 // Process java launcher properties.
127 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
128 // See if sun.java.launcher or sun.java.launcher.pid is defined.
129 // Must do this before setting up other system properties,
130 // as some of them may depend on launcher type.
131 for (int index = 0; index < args->nOptions; index++) {
132 const JavaVMOption* option = args->options + index;
133 const char* tail;
134
135 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
136 process_java_launcher_argument(tail, option->extraInfo);
137 continue;
138 }
139 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
140 _sun_java_launcher_pid = atoi(tail);
141 continue;
142 }
143 }
144 }
145
146 // Initialize system properties key and value.
147 void Arguments::init_system_properties() {
148
149 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
150 "Java Virtual Machine Specification", false));
151 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
153 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
154
155 // following are JVMTI agent writeable properties.
156 // Properties values are set to NULL and they are
157 // os specific they are initialized in os::init_system_properties_values().
158 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
159 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
160 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
161 _java_library_path = new SystemProperty("java.library.path", NULL, true);
162 _java_home = new SystemProperty("java.home", NULL, true);
163 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
164
165 _java_class_path = new SystemProperty("java.class.path", "", true);
166
167 // Add to System Property list.
168 PropertyList_add(&_system_properties, _java_ext_dirs);
169 PropertyList_add(&_system_properties, _java_endorsed_dirs);
170 PropertyList_add(&_system_properties, _sun_boot_library_path);
171 PropertyList_add(&_system_properties, _java_library_path);
172 PropertyList_add(&_system_properties, _java_home);
173 PropertyList_add(&_system_properties, _java_class_path);
174 PropertyList_add(&_system_properties, _sun_boot_class_path);
175
176 // Set OS specific system properties values
177 os::init_system_properties_values();
178 }
179
180
181 // Update/Initialize System properties after JDK version number is known
182 void Arguments::init_version_specific_system_properties() {
183 enum { bufsz = 16 };
184 char buffer[bufsz];
185 const char* spec_vendor = "Sun Microsystems Inc.";
186 uint32_t spec_version = 0;
187
188 if (JDK_Version::is_gte_jdk17x_version()) {
189 spec_vendor = "Oracle Corporation";
190 spec_version = JDK_Version::current().major_version();
191 }
192 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
193
194 PropertyList_add(&_system_properties,
195 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
196 PropertyList_add(&_system_properties,
197 new SystemProperty("java.vm.specification.version", buffer, false));
198 PropertyList_add(&_system_properties,
199 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
200 }
201
202 /**
203 * Provide a slightly more user-friendly way of eliminating -XX flags.
204 * When a flag is eliminated, it can be added to this list in order to
205 * continue accepting this flag on the command-line, while issuing a warning
206 * and ignoring the value. Once the JDK version reaches the 'accept_until'
207 * limit, we flatly refuse to admit the existence of the flag. This allows
208 * a flag to die correctly over JDK releases using HSX.
209 */
210 typedef struct {
211 const char* name;
212 JDK_Version obsoleted_in; // when the flag went away
213 JDK_Version accept_until; // which version to start denying the existence
214 } ObsoleteFlag;
215
216 static ObsoleteFlag obsolete_jvm_flags[] = {
217 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
218 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
219 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
220 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
221 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
222 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
223 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
229 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
230 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
231 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
232 { "DefaultInitialRAMFraction",
233 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
234 { "UseDepthFirstScavengeOrder",
235 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
236 { "HandlePromotionFailure",
237 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
238 { "MaxLiveObjectEvacuationRatio",
239 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
240 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
241 { "UseParallelOldGCCompacting",
242 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
243 { "UseParallelDensePrefixUpdate",
244 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
245 { "UseParallelOldGCDensePrefix",
246 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
247 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
248 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
249 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
250 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
251 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
252 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
253 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
254 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
255 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
256 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
257 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
258 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
259 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
260 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
261 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
262 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
263 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
264 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
265 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
266 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
267 #ifdef PRODUCT
268 { "DesiredMethodLimit",
269 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
270 #endif // PRODUCT
271 { NULL, JDK_Version(0), JDK_Version(0) }
272 };
273
274 // Returns true if the flag is obsolete and fits into the range specified
275 // for being ignored. In the case that the flag is ignored, the 'version'
276 // value is filled in with the version number when the flag became
277 // obsolete so that that value can be displayed to the user.
278 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
279 int i = 0;
280 assert(version != NULL, "Must provide a version buffer");
281 while (obsolete_jvm_flags[i].name != NULL) {
282 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
283 // <flag>=xxx form
284 // [-|+]<flag> form
285 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
286 ((s[0] == '+' || s[0] == '-') &&
287 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
288 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
289 *version = flag_status.obsoleted_in;
290 return true;
291 }
292 }
293 i++;
294 }
295 return false;
296 }
297
298 // Constructs the system class path (aka boot class path) from the following
299 // components, in order:
300 //
301 // prefix // from -Xbootclasspath/p:...
302 // endorsed // the expansion of -Djava.endorsed.dirs=...
303 // base // from os::get_system_properties() or -Xbootclasspath=
304 // suffix // from -Xbootclasspath/a:...
305 //
306 // java.endorsed.dirs is a list of directories; any jar or zip files in the
307 // directories are added to the sysclasspath just before the base.
308 //
309 // This could be AllStatic, but it isn't needed after argument processing is
310 // complete.
311 class SysClassPath: public StackObj {
312 public:
313 SysClassPath(const char* base);
314 ~SysClassPath();
315
316 inline void set_base(const char* base);
317 inline void add_prefix(const char* prefix);
318 inline void add_suffix_to_prefix(const char* suffix);
319 inline void add_suffix(const char* suffix);
320 inline void reset_path(const char* base);
321
322 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
323 // property. Must be called after all command-line arguments have been
324 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
325 // combined_path().
326 void expand_endorsed();
327
328 inline const char* get_base() const { return _items[_scp_base]; }
329 inline const char* get_prefix() const { return _items[_scp_prefix]; }
330 inline const char* get_suffix() const { return _items[_scp_suffix]; }
331 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
332
333 // Combine all the components into a single c-heap-allocated string; caller
334 // must free the string if/when no longer needed.
335 char* combined_path();
336
337 private:
338 // Utility routines.
339 static char* add_to_path(const char* path, const char* str, bool prepend);
340 static char* add_jars_to_path(char* path, const char* directory);
341
342 inline void reset_item_at(int index);
343
344 // Array indices for the items that make up the sysclasspath. All except the
345 // base are allocated in the C heap and freed by this class.
346 enum {
347 _scp_prefix, // from -Xbootclasspath/p:...
348 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
349 _scp_base, // the default sysclasspath
350 _scp_suffix, // from -Xbootclasspath/a:...
351 _scp_nitems // the number of items, must be last.
352 };
353
354 const char* _items[_scp_nitems];
355 DEBUG_ONLY(bool _expansion_done;)
356 };
357
358 SysClassPath::SysClassPath(const char* base) {
359 memset(_items, 0, sizeof(_items));
360 _items[_scp_base] = base;
361 DEBUG_ONLY(_expansion_done = false;)
362 }
363
364 SysClassPath::~SysClassPath() {
365 // Free everything except the base.
366 for (int i = 0; i < _scp_nitems; ++i) {
367 if (i != _scp_base) reset_item_at(i);
368 }
369 DEBUG_ONLY(_expansion_done = false;)
370 }
371
372 inline void SysClassPath::set_base(const char* base) {
373 _items[_scp_base] = base;
374 }
375
376 inline void SysClassPath::add_prefix(const char* prefix) {
377 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
378 }
379
380 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
381 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
382 }
383
384 inline void SysClassPath::add_suffix(const char* suffix) {
385 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
386 }
387
388 inline void SysClassPath::reset_item_at(int index) {
389 assert(index < _scp_nitems && index != _scp_base, "just checking");
390 if (_items[index] != NULL) {
391 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
392 _items[index] = NULL;
393 }
394 }
395
396 inline void SysClassPath::reset_path(const char* base) {
397 // Clear the prefix and suffix.
398 reset_item_at(_scp_prefix);
399 reset_item_at(_scp_suffix);
400 set_base(base);
401 }
402
403 //------------------------------------------------------------------------------
404
405 void SysClassPath::expand_endorsed() {
406 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
407
408 const char* path = Arguments::get_property("java.endorsed.dirs");
409 if (path == NULL) {
410 path = Arguments::get_endorsed_dir();
411 assert(path != NULL, "no default for java.endorsed.dirs");
412 }
413
414 char* expanded_path = NULL;
415 const char separator = *os::path_separator();
416 const char* const end = path + strlen(path);
417 while (path < end) {
418 const char* tmp_end = strchr(path, separator);
419 if (tmp_end == NULL) {
420 expanded_path = add_jars_to_path(expanded_path, path);
421 path = end;
422 } else {
423 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
424 memcpy(dirpath, path, tmp_end - path);
425 dirpath[tmp_end - path] = '\0';
426 expanded_path = add_jars_to_path(expanded_path, dirpath);
427 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
428 path = tmp_end + 1;
429 }
430 }
431 _items[_scp_endorsed] = expanded_path;
432 DEBUG_ONLY(_expansion_done = true;)
433 }
434
435 // Combine the bootclasspath elements, some of which may be null, into a single
436 // c-heap-allocated string.
437 char* SysClassPath::combined_path() {
438 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
439 assert(_expansion_done, "must call expand_endorsed() first.");
440
441 size_t lengths[_scp_nitems];
442 size_t total_len = 0;
443
444 const char separator = *os::path_separator();
445
446 // Get the lengths.
447 int i;
448 for (i = 0; i < _scp_nitems; ++i) {
449 if (_items[i] != NULL) {
450 lengths[i] = strlen(_items[i]);
451 // Include space for the separator char (or a NULL for the last item).
452 total_len += lengths[i] + 1;
453 }
454 }
455 assert(total_len > 0, "empty sysclasspath not allowed");
456
457 // Copy the _items to a single string.
458 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
459 char* cp_tmp = cp;
460 for (i = 0; i < _scp_nitems; ++i) {
461 if (_items[i] != NULL) {
462 memcpy(cp_tmp, _items[i], lengths[i]);
463 cp_tmp += lengths[i];
464 *cp_tmp++ = separator;
465 }
466 }
467 *--cp_tmp = '\0'; // Replace the extra separator.
468 return cp;
469 }
470
471 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
472 char*
473 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
474 char *cp;
475
476 assert(str != NULL, "just checking");
477 if (path == NULL) {
478 size_t len = strlen(str) + 1;
479 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
480 memcpy(cp, str, len); // copy the trailing null
481 } else {
482 const char separator = *os::path_separator();
483 size_t old_len = strlen(path);
484 size_t str_len = strlen(str);
485 size_t len = old_len + str_len + 2;
486
487 if (prepend) {
488 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
489 char* cp_tmp = cp;
490 memcpy(cp_tmp, str, str_len);
491 cp_tmp += str_len;
492 *cp_tmp = separator;
493 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
494 FREE_C_HEAP_ARRAY(char, path, mtInternal);
495 } else {
496 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
497 char* cp_tmp = cp + old_len;
498 *cp_tmp = separator;
499 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
500 }
501 }
502 return cp;
503 }
504
505 // Scan the directory and append any jar or zip files found to path.
506 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
507 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
508 DIR* dir = os::opendir(directory);
509 if (dir == NULL) return path;
510
511 char dir_sep[2] = { '\0', '\0' };
512 size_t directory_len = strlen(directory);
513 const char fileSep = *os::file_separator();
514 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
515
516 /* Scan the directory for jars/zips, appending them to path. */
517 struct dirent *entry;
518 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
519 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
520 const char* name = entry->d_name;
521 const char* ext = name + strlen(name) - 4;
522 bool isJarOrZip = ext > name &&
523 (os::file_name_strcmp(ext, ".jar") == 0 ||
524 os::file_name_strcmp(ext, ".zip") == 0);
525 if (isJarOrZip) {
526 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
527 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
528 path = add_to_path(path, jarpath, false);
529 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
530 }
531 }
532 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
533 os::closedir(dir);
534 return path;
535 }
536
537 // Parses a memory size specification string.
538 static bool atomull(const char *s, julong* result) {
539 julong n = 0;
540 int args_read = sscanf(s, JULONG_FORMAT, &n);
541 if (args_read != 1) {
542 return false;
543 }
544 while (*s != '\0' && isdigit(*s)) {
545 s++;
546 }
547 // 4705540: illegal if more characters are found after the first non-digit
548 if (strlen(s) > 1) {
549 return false;
550 }
551 switch (*s) {
552 case 'T': case 't':
553 *result = n * G * K;
554 // Check for overflow.
555 if (*result/((julong)G * K) != n) return false;
556 return true;
557 case 'G': case 'g':
558 *result = n * G;
559 if (*result/G != n) return false;
560 return true;
561 case 'M': case 'm':
562 *result = n * M;
563 if (*result/M != n) return false;
564 return true;
565 case 'K': case 'k':
566 *result = n * K;
567 if (*result/K != n) return false;
568 return true;
569 case '\0':
570 *result = n;
571 return true;
572 default:
573 return false;
574 }
575 }
576
577 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
578 if (size < min_size) return arg_too_small;
579 // Check that size will fit in a size_t (only relevant on 32-bit)
580 if (size > max_uintx) return arg_too_big;
581 return arg_in_range;
582 }
583
584 // Describe an argument out of range error
585 void Arguments::describe_range_error(ArgsRange errcode) {
586 switch(errcode) {
587 case arg_too_big:
588 jio_fprintf(defaultStream::error_stream(),
589 "The specified size exceeds the maximum "
590 "representable size.\n");
591 break;
592 case arg_too_small:
593 case arg_unreadable:
594 case arg_in_range:
595 // do nothing for now
596 break;
597 default:
598 ShouldNotReachHere();
599 }
600 }
601
602 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
603 return CommandLineFlags::boolAtPut(name, &value, origin);
604 }
605
606 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
607 double v;
608 if (sscanf(value, "%lf", &v) != 1) {
609 return false;
610 }
611
612 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
613 return true;
614 }
615 return false;
616 }
617
618 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
619 julong v;
620 intx intx_v;
621 bool is_neg = false;
622 // Check the sign first since atomull() parses only unsigned values.
623 if (*value == '-') {
624 if (!CommandLineFlags::intxAt(name, &intx_v)) {
625 return false;
626 }
627 value++;
628 is_neg = true;
629 }
630 if (!atomull(value, &v)) {
631 return false;
632 }
633 intx_v = (intx) v;
634 if (is_neg) {
635 intx_v = -intx_v;
636 }
637 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
638 return true;
639 }
640 uintx uintx_v = (uintx) v;
641 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
642 return true;
643 }
644 uint64_t uint64_t_v = (uint64_t) v;
645 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
646 return true;
647 }
648 return false;
649 }
650
651 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
652 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
653 // Contract: CommandLineFlags always returns a pointer that needs freeing.
654 FREE_C_HEAP_ARRAY(char, value, mtInternal);
655 return true;
656 }
657
658 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
659 const char* old_value = "";
660 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
661 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
662 size_t new_len = strlen(new_value);
663 const char* value;
664 char* free_this_too = NULL;
665 if (old_len == 0) {
666 value = new_value;
667 } else if (new_len == 0) {
668 value = old_value;
669 } else {
670 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
671 // each new setting adds another LINE to the switch:
672 sprintf(buf, "%s\n%s", old_value, new_value);
673 value = buf;
674 free_this_too = buf;
675 }
676 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
677 // CommandLineFlags always returns a pointer that needs freeing.
678 FREE_C_HEAP_ARRAY(char, value, mtInternal);
679 if (free_this_too != NULL) {
680 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
681 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
682 }
683 return true;
684 }
685
686 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
687
688 // range of acceptable characters spelled out for portability reasons
689 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
690 #define BUFLEN 255
691 char name[BUFLEN+1];
692 char dummy;
693
694 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
695 return set_bool_flag(name, false, origin);
696 }
697 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
698 return set_bool_flag(name, true, origin);
699 }
700
701 char punct;
702 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
703 const char* value = strchr(arg, '=') + 1;
704 Flag* flag = Flag::find_flag(name, strlen(name));
705 if (flag != NULL && flag->is_ccstr()) {
706 if (flag->ccstr_accumulates()) {
707 return append_to_string_flag(name, value, origin);
708 } else {
709 if (value[0] == '\0') {
710 value = NULL;
711 }
712 return set_string_flag(name, value, origin);
713 }
714 }
715 }
716
717 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
718 const char* value = strchr(arg, '=') + 1;
719 // -XX:Foo:=xxx will reset the string flag to the given value.
720 if (value[0] == '\0') {
721 value = NULL;
722 }
723 return set_string_flag(name, value, origin);
724 }
725
726 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
727 #define SIGNED_NUMBER_RANGE "[-0123456789]"
728 #define NUMBER_RANGE "[0123456789]"
729 char value[BUFLEN + 1];
730 char value2[BUFLEN + 1];
731 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
732 // Looks like a floating-point number -- try again with more lenient format string
733 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
734 return set_fp_numeric_flag(name, value, origin);
735 }
736 }
737
738 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
739 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
740 return set_numeric_flag(name, value, origin);
741 }
742
743 return false;
744 }
745
746 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
747 assert(bldarray != NULL, "illegal argument");
748
749 if (arg == NULL) {
750 return;
751 }
752
753 int new_count = *count + 1;
754
755 // expand the array and add arg to the last element
756 if (*bldarray == NULL) {
757 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
758 } else {
759 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
760 }
761 (*bldarray)[*count] = strdup(arg);
762 *count = new_count;
763 }
764
765 void Arguments::build_jvm_args(const char* arg) {
766 add_string(&_jvm_args_array, &_num_jvm_args, arg);
767 }
768
769 void Arguments::build_jvm_flags(const char* arg) {
770 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
771 }
772
773 // utility function to return a string that concatenates all
774 // strings in a given char** array
775 const char* Arguments::build_resource_string(char** args, int count) {
776 if (args == NULL || count == 0) {
777 return NULL;
778 }
779 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
780 for (int i = 1; i < count; i++) {
781 length += strlen(args[i]) + 1; // add 1 for a space
782 }
783 char* s = NEW_RESOURCE_ARRAY(char, length);
784 strcpy(s, args[0]);
785 for (int j = 1; j < count; j++) {
786 strcat(s, " ");
787 strcat(s, args[j]);
788 }
789 return (const char*) s;
790 }
791
792 void Arguments::print_on(outputStream* st) {
793 st->print_cr("VM Arguments:");
794 if (num_jvm_flags() > 0) {
795 st->print("jvm_flags: "); print_jvm_flags_on(st);
796 }
797 if (num_jvm_args() > 0) {
798 st->print("jvm_args: "); print_jvm_args_on(st);
799 }
800 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
801 if (_java_class_path != NULL) {
802 char* path = _java_class_path->value();
803 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
804 }
805 st->print_cr("Launcher Type: %s", _sun_java_launcher);
806 }
807
808 void Arguments::print_jvm_flags_on(outputStream* st) {
809 if (_num_jvm_flags > 0) {
810 for (int i=0; i < _num_jvm_flags; i++) {
811 st->print("%s ", _jvm_flags_array[i]);
812 }
813 st->print_cr("");
814 }
815 }
816
817 void Arguments::print_jvm_args_on(outputStream* st) {
818 if (_num_jvm_args > 0) {
819 for (int i=0; i < _num_jvm_args; i++) {
820 st->print("%s ", _jvm_args_array[i]);
821 }
822 st->print_cr("");
823 }
824 }
825
826 bool Arguments::process_argument(const char* arg,
827 jboolean ignore_unrecognized, FlagValueOrigin origin) {
828
829 JDK_Version since = JDK_Version();
830
831 if (parse_argument(arg, origin) || ignore_unrecognized) {
832 return true;
833 }
834
835 bool has_plus_minus = (*arg == '+' || *arg == '-');
836 const char* const argname = has_plus_minus ? arg + 1 : arg;
837 if (is_newly_obsolete(arg, &since)) {
838 char version[256];
839 since.to_string(version, sizeof(version));
840 warning("ignoring option %s; support was removed in %s", argname, version);
841 return true;
842 }
843
844 // For locked flags, report a custom error message if available.
845 // Otherwise, report the standard unrecognized VM option.
846
847 size_t arg_len;
848 const char* equal_sign = strchr(argname, '=');
849 if (equal_sign == NULL) {
850 arg_len = strlen(argname);
851 } else {
852 arg_len = equal_sign - argname;
853 }
854
855 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true);
856 if (found_flag != NULL) {
857 char locked_message_buf[BUFLEN];
858 found_flag->get_locked_message(locked_message_buf, BUFLEN);
859 if (strlen(locked_message_buf) == 0) {
860 if (found_flag->is_bool() && !has_plus_minus) {
861 jio_fprintf(defaultStream::error_stream(),
862 "Missing +/- setting for VM option '%s'\n", argname);
863 } else if (!found_flag->is_bool() && has_plus_minus) {
864 jio_fprintf(defaultStream::error_stream(),
865 "Unexpected +/- setting in VM option '%s'\n", argname);
866 } else {
867 jio_fprintf(defaultStream::error_stream(),
868 "Improperly specified VM option '%s'\n", argname);
869 }
870 } else {
871 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
872 }
873 } else {
874 jio_fprintf(defaultStream::error_stream(),
875 "Unrecognized VM option '%s'\n", argname);
876 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
877 if (fuzzy_matched != NULL) {
878 jio_fprintf(defaultStream::error_stream(),
879 "Did you mean '%s%s%s'?\n",
880 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
881 fuzzy_matched->name,
882 (fuzzy_matched->is_bool()) ? "" : "=<value>");
883 }
884 }
885
886 // allow for commandline "commenting out" options like -XX:#+Verbose
887 return arg[0] == '#';
888 }
889
890 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
891 FILE* stream = fopen(file_name, "rb");
892 if (stream == NULL) {
893 if (should_exist) {
894 jio_fprintf(defaultStream::error_stream(),
895 "Could not open settings file %s\n", file_name);
896 return false;
897 } else {
898 return true;
899 }
900 }
901
902 char token[1024];
903 int pos = 0;
904
905 bool in_white_space = true;
906 bool in_comment = false;
907 bool in_quote = false;
908 char quote_c = 0;
909 bool result = true;
910
911 int c = getc(stream);
912 while(c != EOF && pos < (int)(sizeof(token)-1)) {
913 if (in_white_space) {
914 if (in_comment) {
915 if (c == '\n') in_comment = false;
916 } else {
917 if (c == '#') in_comment = true;
918 else if (!isspace(c)) {
919 in_white_space = false;
920 token[pos++] = c;
921 }
922 }
923 } else {
924 if (c == '\n' || (!in_quote && isspace(c))) {
925 // token ends at newline, or at unquoted whitespace
926 // this allows a way to include spaces in string-valued options
927 token[pos] = '\0';
928 logOption(token);
929 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
930 build_jvm_flags(token);
931 pos = 0;
932 in_white_space = true;
933 in_quote = false;
934 } else if (!in_quote && (c == '\'' || c == '"')) {
935 in_quote = true;
936 quote_c = c;
937 } else if (in_quote && (c == quote_c)) {
938 in_quote = false;
939 } else {
940 token[pos++] = c;
941 }
942 }
943 c = getc(stream);
944 }
945 if (pos > 0) {
946 token[pos] = '\0';
947 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
948 build_jvm_flags(token);
949 }
950 fclose(stream);
951 return result;
952 }
953
954 //=============================================================================================================
955 // Parsing of properties (-D)
956
957 const char* Arguments::get_property(const char* key) {
958 return PropertyList_get_value(system_properties(), key);
959 }
960
961 bool Arguments::add_property(const char* prop) {
962 const char* eq = strchr(prop, '=');
963 char* key;
964 // ns must be static--its address may be stored in a SystemProperty object.
965 const static char ns[1] = {0};
966 char* value = (char *)ns;
967
968 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
969 key = AllocateHeap(key_len + 1, mtInternal);
970 strncpy(key, prop, key_len);
971 key[key_len] = '\0';
972
973 if (eq != NULL) {
974 size_t value_len = strlen(prop) - key_len - 1;
975 value = AllocateHeap(value_len + 1, mtInternal);
976 strncpy(value, &prop[key_len + 1], value_len + 1);
977 }
978
979 if (strcmp(key, "java.compiler") == 0) {
980 process_java_compiler_argument(value);
981 FreeHeap(key);
982 if (eq != NULL) {
983 FreeHeap(value);
984 }
985 return true;
986 } else if (strcmp(key, "sun.java.command") == 0) {
987 _java_command = value;
988
989 // Record value in Arguments, but let it get passed to Java.
990 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
991 // launcher.pid property is private and is processed
992 // in process_sun_java_launcher_properties();
993 // the sun.java.launcher property is passed on to the java application
994 FreeHeap(key);
995 if (eq != NULL) {
996 FreeHeap(value);
997 }
998 return true;
999 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1000 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1001 // its value without going through the property list or making a Java call.
1002 _java_vendor_url_bug = value;
1003 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1004 PropertyList_unique_add(&_system_properties, key, value, true);
1005 return true;
1006 }
1007 // Create new property and add at the end of the list
1008 PropertyList_unique_add(&_system_properties, key, value);
1009 return true;
1010 }
1011
1012 //===========================================================================================================
1013 // Setting int/mixed/comp mode flags
1014
1015 void Arguments::set_mode_flags(Mode mode) {
1016 // Set up default values for all flags.
1017 // If you add a flag to any of the branches below,
1018 // add a default value for it here.
1019 set_java_compiler(false);
1020 _mode = mode;
1021
1022 // Ensure Agent_OnLoad has the correct initial values.
1023 // This may not be the final mode; mode may change later in onload phase.
1024 PropertyList_unique_add(&_system_properties, "java.vm.info",
1025 (char*)VM_Version::vm_info_string(), false);
1026
1027 UseInterpreter = true;
1028 UseCompiler = true;
1029 UseLoopCounter = true;
1030
1031 #ifndef ZERO
1032 // Turn these off for mixed and comp. Leave them on for Zero.
1033 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1034 UseFastAccessorMethods = (mode == _int);
1035 }
1036 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1037 UseFastEmptyMethods = (mode == _int);
1038 }
1039 #endif
1040
1041 // Default values may be platform/compiler dependent -
1042 // use the saved values
1043 ClipInlining = Arguments::_ClipInlining;
1044 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1045 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1046 BackgroundCompilation = Arguments::_BackgroundCompilation;
1047
1048 // Change from defaults based on mode
1049 switch (mode) {
1050 default:
1051 ShouldNotReachHere();
1052 break;
1053 case _int:
1054 UseCompiler = false;
1055 UseLoopCounter = false;
1056 AlwaysCompileLoopMethods = false;
1057 UseOnStackReplacement = false;
1058 break;
1059 case _mixed:
1060 // same as default
1061 break;
1062 case _comp:
1063 UseInterpreter = false;
1064 BackgroundCompilation = false;
1065 ClipInlining = false;
1066 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1067 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1068 // compile a level 4 (C2) and then continue executing it.
1069 if (TieredCompilation) {
1070 Tier3InvokeNotifyFreqLog = 0;
1071 Tier4InvocationThreshold = 0;
1072 }
1073 break;
1074 }
1075 }
1076
1077 // Conflict: required to use shared spaces (-Xshare:on), but
1078 // incompatible command line options were chosen.
1079
1080 static void no_shared_spaces() {
1081 if (RequireSharedSpaces) {
1082 jio_fprintf(defaultStream::error_stream(),
1083 "Class data sharing is inconsistent with other specified options.\n");
1084 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1085 } else {
1086 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1087 }
1088 }
1089
1090 void Arguments::set_tiered_flags() {
1091 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1092 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1093 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1094 }
1095 if (CompilationPolicyChoice < 2) {
1096 vm_exit_during_initialization(
1097 "Incompatible compilation policy selected", NULL);
1098 }
1099 // Increase the code cache size - tiered compiles a lot more.
1100 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1101 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1102 }
1103 if (!UseInterpreter) { // -Xcomp
1104 Tier3InvokeNotifyFreqLog = 0;
1105 Tier4InvocationThreshold = 0;
1106 }
1107 }
1108
1109 #if INCLUDE_ALL_GCS
1110 static void disable_adaptive_size_policy(const char* collector_name) {
1111 if (UseAdaptiveSizePolicy) {
1112 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1113 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1114 collector_name);
1115 }
1116 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1117 }
1118 }
1119
1120 void Arguments::set_parnew_gc_flags() {
1121 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1122 "control point invariant");
1123 assert(UseParNewGC, "Error");
1124
1125 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1126 disable_adaptive_size_policy("UseParNewGC");
1127
1128 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1129 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1130 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1131 } else if (ParallelGCThreads == 0) {
1132 jio_fprintf(defaultStream::error_stream(),
1133 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1134 vm_exit(1);
1135 }
1136
1137 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1138 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1139 // we set them to 1024 and 1024.
1140 // See CR 6362902.
1141 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1142 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1143 }
1144 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1145 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1146 }
1147
1148 // AlwaysTenure flag should make ParNew promote all at first collection.
1149 // See CR 6362902.
1150 if (AlwaysTenure) {
1151 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1152 }
1153 // When using compressed oops, we use local overflow stacks,
1154 // rather than using a global overflow list chained through
1155 // the klass word of the object's pre-image.
1156 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1157 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1158 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1159 }
1160 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1161 }
1162 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1163 }
1164
1165 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1166 // sparc/solaris for certain applications, but would gain from
1167 // further optimization and tuning efforts, and would almost
1168 // certainly gain from analysis of platform and environment.
1169 void Arguments::set_cms_and_parnew_gc_flags() {
1170 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1171 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1172
1173 // If we are using CMS, we prefer to UseParNewGC,
1174 // unless explicitly forbidden.
1175 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1176 FLAG_SET_ERGO(bool, UseParNewGC, true);
1177 }
1178
1179 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1180 disable_adaptive_size_policy("UseConcMarkSweepGC");
1181
1182 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1183 // as needed.
1184 if (UseParNewGC) {
1185 set_parnew_gc_flags();
1186 }
1187
1188 size_t max_heap = align_size_down(MaxHeapSize,
1189 CardTableRS::ct_max_alignment_constraint());
1190
1191 // Now make adjustments for CMS
1192 intx tenuring_default = (intx)6;
1193 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1194
1195 // Preferred young gen size for "short" pauses:
1196 // upper bound depends on # of threads and NewRatio.
1197 const uintx parallel_gc_threads =
1198 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1199 const size_t preferred_max_new_size_unaligned =
1200 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1201 size_t preferred_max_new_size =
1202 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1203
1204 // Unless explicitly requested otherwise, size young gen
1205 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1206
1207 // If either MaxNewSize or NewRatio is set on the command line,
1208 // assume the user is trying to set the size of the young gen.
1209 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1210
1211 // Set MaxNewSize to our calculated preferred_max_new_size unless
1212 // NewSize was set on the command line and it is larger than
1213 // preferred_max_new_size.
1214 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1215 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1216 } else {
1217 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1218 }
1219 if (PrintGCDetails && Verbose) {
1220 // Too early to use gclog_or_tty
1221 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1222 }
1223
1224 // Code along this path potentially sets NewSize and OldSize
1225 if (PrintGCDetails && Verbose) {
1226 // Too early to use gclog_or_tty
1227 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1228 " initial_heap_size: " SIZE_FORMAT
1229 " max_heap: " SIZE_FORMAT,
1230 min_heap_size(), InitialHeapSize, max_heap);
1231 }
1232 size_t min_new = preferred_max_new_size;
1233 if (FLAG_IS_CMDLINE(NewSize)) {
1234 min_new = NewSize;
1235 }
1236 if (max_heap > min_new && min_heap_size() > min_new) {
1237 // Unless explicitly requested otherwise, make young gen
1238 // at least min_new, and at most preferred_max_new_size.
1239 if (FLAG_IS_DEFAULT(NewSize)) {
1240 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1241 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1242 if (PrintGCDetails && Verbose) {
1243 // Too early to use gclog_or_tty
1244 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1245 }
1246 }
1247 // Unless explicitly requested otherwise, size old gen
1248 // so it's NewRatio x of NewSize.
1249 if (FLAG_IS_DEFAULT(OldSize)) {
1250 if (max_heap > NewSize) {
1251 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1252 if (PrintGCDetails && Verbose) {
1253 // Too early to use gclog_or_tty
1254 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1255 }
1256 }
1257 }
1258 }
1259 }
1260 // Unless explicitly requested otherwise, definitely
1261 // promote all objects surviving "tenuring_default" scavenges.
1262 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1263 FLAG_IS_DEFAULT(SurvivorRatio)) {
1264 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1265 }
1266 // If we decided above (or user explicitly requested)
1267 // `promote all' (via MaxTenuringThreshold := 0),
1268 // prefer minuscule survivor spaces so as not to waste
1269 // space for (non-existent) survivors
1270 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1271 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1272 }
1273 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1274 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1275 // This is done in order to make ParNew+CMS configuration to work
1276 // with YoungPLABSize and OldPLABSize options.
1277 // See CR 6362902.
1278 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1279 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1280 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1281 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1282 // the value (either from the command line or ergonomics) of
1283 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1284 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1285 } else {
1286 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1287 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1288 // we'll let it to take precedence.
1289 jio_fprintf(defaultStream::error_stream(),
1290 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1291 " options are specified for the CMS collector."
1292 " CMSParPromoteBlocksToClaim will take precedence.\n");
1293 }
1294 }
1295 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1296 // OldPLAB sizing manually turned off: Use a larger default setting,
1297 // unless it was manually specified. This is because a too-low value
1298 // will slow down scavenges.
1299 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1300 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1301 }
1302 }
1303 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1304 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1305 // If either of the static initialization defaults have changed, note this
1306 // modification.
1307 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1308 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1309 }
1310 if (PrintGCDetails && Verbose) {
1311 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1312 MarkStackSize / K, MarkStackSizeMax / K);
1313 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1314 }
1315 }
1316 #endif // INCLUDE_ALL_GCS
1317
1318 void set_object_alignment() {
1319 // Object alignment.
1320 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1321 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1322 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1323 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1324 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1325 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1326
1327 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1328 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1329
1330 // Oop encoding heap max
1331 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1332
1333 #if INCLUDE_ALL_GCS
1334 // Set CMS global values
1335 CompactibleFreeListSpace::set_cms_values();
1336 #endif // INCLUDE_ALL_GCS
1337 }
1338
1339 bool verify_object_alignment() {
1340 // Object alignment.
1341 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1342 jio_fprintf(defaultStream::error_stream(),
1343 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1344 (int)ObjectAlignmentInBytes);
1345 return false;
1346 }
1347 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1348 jio_fprintf(defaultStream::error_stream(),
1349 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1350 (int)ObjectAlignmentInBytes, BytesPerLong);
1351 return false;
1352 }
1353 // It does not make sense to have big object alignment
1354 // since a space lost due to alignment will be greater
1355 // then a saved space from compressed oops.
1356 if ((int)ObjectAlignmentInBytes > 256) {
1357 jio_fprintf(defaultStream::error_stream(),
1358 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1359 (int)ObjectAlignmentInBytes);
1360 return false;
1361 }
1362 // In case page size is very small.
1363 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1364 jio_fprintf(defaultStream::error_stream(),
1365 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1366 (int)ObjectAlignmentInBytes, os::vm_page_size());
1367 return false;
1368 }
1369 return true;
1370 }
1371
1372 inline uintx max_heap_for_compressed_oops() {
1373 // Avoid sign flip.
1374 if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) {
1375 return 0;
1376 }
1377 LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size());
1378 NOT_LP64(ShouldNotReachHere(); return 0);
1379 }
1380
1381 bool Arguments::should_auto_select_low_pause_collector() {
1382 if (UseAutoGCSelectPolicy &&
1383 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1384 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1385 if (PrintGCDetails) {
1386 // Cannot use gclog_or_tty yet.
1387 tty->print_cr("Automatic selection of the low pause collector"
1388 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1389 }
1390 return true;
1391 }
1392 return false;
1393 }
1394
1395 void Arguments::set_use_compressed_oops() {
1396 #ifndef ZERO
1397 #ifdef _LP64
1398 // MaxHeapSize is not set up properly at this point, but
1399 // the only value that can override MaxHeapSize if we are
1400 // to use UseCompressedOops is InitialHeapSize.
1401 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1402
1403 if (max_heap_size <= max_heap_for_compressed_oops()) {
1404 #if !defined(COMPILER1) || defined(TIERED)
1405 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1406 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1407 }
1408 #endif
1409 #ifdef _WIN64
1410 if (UseLargePages && UseCompressedOops) {
1411 // Cannot allocate guard pages for implicit checks in indexed addressing
1412 // mode, when large pages are specified on windows.
1413 // This flag could be switched ON if narrow oop base address is set to 0,
1414 // see code in Universe::initialize_heap().
1415 Universe::set_narrow_oop_use_implicit_null_checks(false);
1416 }
1417 #endif // _WIN64
1418 } else {
1419 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1420 warning("Max heap size too large for Compressed Oops");
1421 FLAG_SET_DEFAULT(UseCompressedOops, false);
1422 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1423 }
1424 }
1425 #endif // _LP64
1426 #endif // ZERO
1427 }
1428
1429 void Arguments::set_ergonomics_flags() {
1430
1431 if (os::is_server_class_machine()) {
1432 // If no other collector is requested explicitly,
1433 // let the VM select the collector based on
1434 // machine class and automatic selection policy.
1435 if (!UseSerialGC &&
1436 !UseConcMarkSweepGC &&
1437 !UseG1GC &&
1438 !UseParNewGC &&
1439 FLAG_IS_DEFAULT(UseParallelGC)) {
1440 if (should_auto_select_low_pause_collector()) {
1441 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1442 } else {
1443 FLAG_SET_ERGO(bool, UseParallelGC, true);
1444 }
1445 }
1446 // Shared spaces work fine with other GCs but causes bytecode rewriting
1447 // to be disabled, which hurts interpreter performance and decreases
1448 // server performance. On server class machines, keep the default
1449 // off unless it is asked for. Future work: either add bytecode rewriting
1450 // at link time, or rewrite bytecodes in non-shared methods.
1451 if (!DumpSharedSpaces && !RequireSharedSpaces) {
1452 no_shared_spaces();
1453 }
1454 }
1455
1456 #ifndef ZERO
1457 #ifdef _LP64
1458 set_use_compressed_oops();
1459 // UseCompressedOops must be on for UseCompressedKlassPointers to be on.
1460 if (!UseCompressedOops) {
1461 if (UseCompressedKlassPointers) {
1462 warning("UseCompressedKlassPointers requires UseCompressedOops");
1463 }
1464 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1465 } else {
1466 // Turn on UseCompressedKlassPointers too
1467 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) {
1468 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true);
1469 }
1470 // Set the ClassMetaspaceSize to something that will not need to be
1471 // expanded, since it cannot be expanded.
1472 if (UseCompressedKlassPointers) {
1473 if (ClassMetaspaceSize > KlassEncodingMetaspaceMax) {
1474 warning("Class metaspace size is too large for UseCompressedKlassPointers");
1475 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1476 } else if (FLAG_IS_DEFAULT(ClassMetaspaceSize)) {
1477 // 100,000 classes seems like a good size, so 100M assumes around 1K
1478 // per klass. The vtable and oopMap is embedded so we don't have a fixed
1479 // size per klass. Eventually, this will be parameterized because it
1480 // would also be useful to determine the optimal size of the
1481 // systemDictionary.
1482 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M);
1483 }
1484 }
1485 }
1486 // Also checks that certain machines are slower with compressed oops
1487 // in vm_version initialization code.
1488 #endif // _LP64
1489 #endif // !ZERO
1490 }
1491
1492 void Arguments::set_parallel_gc_flags() {
1493 assert(UseParallelGC || UseParallelOldGC, "Error");
1494 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1495 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1496 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1497 }
1498 FLAG_SET_DEFAULT(UseParallelGC, true);
1499
1500 // If no heap maximum was requested explicitly, use some reasonable fraction
1501 // of the physical memory, up to a maximum of 1GB.
1502 FLAG_SET_DEFAULT(ParallelGCThreads,
1503 Abstract_VM_Version::parallel_worker_threads());
1504 if (ParallelGCThreads == 0) {
1505 jio_fprintf(defaultStream::error_stream(),
1506 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1507 vm_exit(1);
1508 }
1509
1510
1511 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1512 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1513 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1514 // See CR 6362902 for details.
1515 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1516 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1517 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1518 }
1519 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1520 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1521 }
1522 }
1523
1524 if (UseParallelOldGC) {
1525 // Par compact uses lower default values since they are treated as
1526 // minimums. These are different defaults because of the different
1527 // interpretation and are not ergonomically set.
1528 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1529 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1530 }
1531 }
1532 }
1533
1534 void Arguments::set_g1_gc_flags() {
1535 assert(UseG1GC, "Error");
1536 #ifdef COMPILER1
1537 FastTLABRefill = false;
1538 #endif
1539 FLAG_SET_DEFAULT(ParallelGCThreads,
1540 Abstract_VM_Version::parallel_worker_threads());
1541 if (ParallelGCThreads == 0) {
1542 FLAG_SET_DEFAULT(ParallelGCThreads,
1543 Abstract_VM_Version::parallel_worker_threads());
1544 }
1545
1546 // MarkStackSize will be set (if it hasn't been set by the user)
1547 // when concurrent marking is initialized.
1548 // Its value will be based upon the number of parallel marking threads.
1549 // But we do set the maximum mark stack size here.
1550 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1551 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1552 }
1553
1554 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1555 // In G1, we want the default GC overhead goal to be higher than
1556 // say in PS. So we set it here to 10%. Otherwise the heap might
1557 // be expanded more aggressively than we would like it to. In
1558 // fact, even 10% seems to not be high enough in some cases
1559 // (especially small GC stress tests that the main thing they do
1560 // is allocation). We might consider increase it further.
1561 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1562 }
1563
1564 if (PrintGCDetails && Verbose) {
1565 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1566 MarkStackSize / K, MarkStackSizeMax / K);
1567 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1568 }
1569 }
1570
1571 julong Arguments::limit_by_allocatable_memory(julong limit) {
1572 julong max_allocatable;
1573 julong result = limit;
1574 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1575 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1576 }
1577 return result;
1578 }
1579
1580 void Arguments::set_heap_base_min_address() {
1581 if (FLAG_IS_DEFAULT(HeapBaseMinAddress) && UseG1GC && HeapBaseMinAddress < 1*G) {
1582 // By default HeapBaseMinAddress is 2G on all platforms except Solaris x86.
1583 // G1 currently needs a lot of C-heap, so on Solaris we have to give G1
1584 // some extra space for the C-heap compared to other collectors.
1585 // Use FLAG_SET_DEFAULT here rather than FLAG_SET_ERGO to make sure that
1586 // code that checks for default values work correctly.
1587 FLAG_SET_DEFAULT(HeapBaseMinAddress, 1*G);
1588 }
1589 }
1590
1591 void Arguments::set_heap_size() {
1592 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1593 // Deprecated flag
1594 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
1595 "Use MaxRAMFraction instead.");
1596 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1597 }
1598
1599 const julong phys_mem =
1600 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1601 : (julong)MaxRAM;
1602
1603 // If the maximum heap size has not been set with -Xmx,
1604 // then set it as fraction of the size of physical memory,
1605 // respecting the maximum and minimum sizes of the heap.
1606 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1607 julong reasonable_max = phys_mem / MaxRAMFraction;
1608
1609 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1610 // Small physical memory, so use a minimum fraction of it for the heap
1611 reasonable_max = phys_mem / MinRAMFraction;
1612 } else {
1613 // Not-small physical memory, so require a heap at least
1614 // as large as MaxHeapSize
1615 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1616 }
1617 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1618 // Limit the heap size to ErgoHeapSizeLimit
1619 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1620 }
1621 if (UseCompressedOops) {
1622 // Limit the heap size to the maximum possible when using compressed oops
1623 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1624 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1625 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1626 // but it should be not less than default MaxHeapSize.
1627 max_coop_heap -= HeapBaseMinAddress;
1628 }
1629 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1630 }
1631 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1632
1633 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1634 // An initial heap size was specified on the command line,
1635 // so be sure that the maximum size is consistent. Done
1636 // after call to limit_by_allocatable_memory because that
1637 // method might reduce the allocation size.
1638 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1639 }
1640
1641 if (PrintGCDetails && Verbose) {
1642 // Cannot use gclog_or_tty yet.
1643 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1644 }
1645 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1646 }
1647
1648 // If the minimum or initial heap_size have not been set or requested to be set
1649 // ergonomically, set them accordingly.
1650 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1651 julong reasonable_minimum = (julong)(OldSize + NewSize);
1652
1653 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1654
1655 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1656
1657 if (InitialHeapSize == 0) {
1658 julong reasonable_initial = phys_mem / InitialRAMFraction;
1659
1660 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1661 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1662
1663 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1664
1665 if (PrintGCDetails && Verbose) {
1666 // Cannot use gclog_or_tty yet.
1667 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1668 }
1669 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1670 }
1671 // If the minimum heap size has not been set (via -Xms),
1672 // synchronize with InitialHeapSize to avoid errors with the default value.
1673 if (min_heap_size() == 0) {
1674 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1675 if (PrintGCDetails && Verbose) {
1676 // Cannot use gclog_or_tty yet.
1677 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1678 }
1679 }
1680 }
1681 }
1682
1683 // This must be called after ergonomics because we want bytecode rewriting
1684 // if the server compiler is used, or if UseSharedSpaces is disabled.
1685 void Arguments::set_bytecode_flags() {
1686 // Better not attempt to store into a read-only space.
1687 if (UseSharedSpaces) {
1688 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1689 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1690 }
1691
1692 if (!RewriteBytecodes) {
1693 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1694 }
1695 }
1696
1697 // Aggressive optimization flags -XX:+AggressiveOpts
1698 void Arguments::set_aggressive_opts_flags() {
1699 #ifdef COMPILER2
1700 if (AggressiveUnboxing) {
1701 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1702 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1703 } else if (!EliminateAutoBox) {
1704 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1705 AggressiveUnboxing = false;
1706 }
1707 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1708 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1709 } else if (!DoEscapeAnalysis) {
1710 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1711 AggressiveUnboxing = false;
1712 }
1713 }
1714 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1715 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1716 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1717 }
1718 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1719 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1720 }
1721
1722 // Feed the cache size setting into the JDK
1723 char buffer[1024];
1724 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1725 add_property(buffer);
1726 }
1727 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1728 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1729 }
1730 #endif
1731
1732 if (AggressiveOpts) {
1733 // Sample flag setting code
1734 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1735 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1736 // }
1737 }
1738 }
1739
1740 //===========================================================================================================
1741 // Parsing of java.compiler property
1742
1743 void Arguments::process_java_compiler_argument(char* arg) {
1744 // For backwards compatibility, Djava.compiler=NONE or ""
1745 // causes us to switch to -Xint mode UNLESS -Xdebug
1746 // is also specified.
1747 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1748 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1749 }
1750 }
1751
1752 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1753 _sun_java_launcher = strdup(launcher);
1754 if (strcmp("gamma", _sun_java_launcher) == 0) {
1755 _created_by_gamma_launcher = true;
1756 }
1757 }
1758
1759 bool Arguments::created_by_java_launcher() {
1760 assert(_sun_java_launcher != NULL, "property must have value");
1761 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1762 }
1763
1764 bool Arguments::created_by_gamma_launcher() {
1765 return _created_by_gamma_launcher;
1766 }
1767
1768 //===========================================================================================================
1769 // Parsing of main arguments
1770
1771 bool Arguments::verify_interval(uintx val, uintx min,
1772 uintx max, const char* name) {
1773 // Returns true iff value is in the inclusive interval [min..max]
1774 // false, otherwise.
1775 if (val >= min && val <= max) {
1776 return true;
1777 }
1778 jio_fprintf(defaultStream::error_stream(),
1779 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1780 " and " UINTX_FORMAT "\n",
1781 name, val, min, max);
1782 return false;
1783 }
1784
1785 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1786 // Returns true if given value is at least specified min threshold
1787 // false, otherwise.
1788 if (val >= min ) {
1789 return true;
1790 }
1791 jio_fprintf(defaultStream::error_stream(),
1792 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1793 name, val, min);
1794 return false;
1795 }
1796
1797 bool Arguments::verify_percentage(uintx value, const char* name) {
1798 if (value <= 100) {
1799 return true;
1800 }
1801 jio_fprintf(defaultStream::error_stream(),
1802 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1803 name, value);
1804 return false;
1805 }
1806
1807 #if !INCLUDE_ALL_GCS
1808 #ifdef ASSERT
1809 static bool verify_serial_gc_flags() {
1810 return (UseSerialGC &&
1811 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1812 UseParallelGC || UseParallelOldGC));
1813 }
1814 #endif // ASSERT
1815 #endif // INCLUDE_ALL_GCS
1816
1817 // check if do gclog rotation
1818 // +UseGCLogFileRotation is a must,
1819 // no gc log rotation when log file not supplied or
1820 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1821 void check_gclog_consistency() {
1822 if (UseGCLogFileRotation) {
1823 if ((Arguments::gc_log_filename() == NULL) ||
1824 (NumberOfGCLogFiles == 0) ||
1825 (GCLogFileSize == 0)) {
1826 jio_fprintf(defaultStream::output_stream(),
1827 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1828 "where num_of_file > 0 and num_of_size > 0\n"
1829 "GC log rotation is turned off\n");
1830 UseGCLogFileRotation = false;
1831 }
1832 }
1833
1834 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1835 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1836 jio_fprintf(defaultStream::output_stream(),
1837 "GCLogFileSize changed to minimum 8K\n");
1838 }
1839 }
1840
1841 // Check consistency of GC selection
1842 bool Arguments::check_gc_consistency() {
1843 check_gclog_consistency();
1844 bool status = true;
1845 // Ensure that the user has not selected conflicting sets
1846 // of collectors. [Note: this check is merely a user convenience;
1847 // collectors over-ride each other so that only a non-conflicting
1848 // set is selected; however what the user gets is not what they
1849 // may have expected from the combination they asked for. It's
1850 // better to reduce user confusion by not allowing them to
1851 // select conflicting combinations.
1852 uint i = 0;
1853 if (UseSerialGC) i++;
1854 if (UseConcMarkSweepGC || UseParNewGC) i++;
1855 if (UseParallelGC || UseParallelOldGC) i++;
1856 if (UseG1GC) i++;
1857 if (i > 1) {
1858 jio_fprintf(defaultStream::error_stream(),
1859 "Conflicting collector combinations in option list; "
1860 "please refer to the release notes for the combinations "
1861 "allowed\n");
1862 status = false;
1863 } else if (ReservedCodeCacheSize > 2*G) {
1864 // Code cache size larger than MAXINT is not supported.
1865 jio_fprintf(defaultStream::error_stream(),
1866 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
1867 (2*G)/M);
1868 status = false;
1869 }
1870 return status;
1871 }
1872
1873 void Arguments::check_deprecated_gcs() {
1874 if (UseConcMarkSweepGC && !UseParNewGC) {
1875 warning("Using the DefNew young collector with the CMS collector is deprecated "
1876 "and will likely be removed in a future release");
1877 }
1878
1879 if (UseParNewGC && !UseConcMarkSweepGC) {
1880 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
1881 // set up UseSerialGC properly, so that can't be used in the check here.
1882 warning("Using the ParNew young collector with the Serial old collector is deprecated "
1883 "and will likely be removed in a future release");
1884 }
1885
1886 if (CMSIncrementalMode) {
1887 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
1888 }
1889 }
1890
1891 void Arguments::check_deprecated_gc_flags() {
1892 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
1893 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
1894 "and will likely be removed in future release");
1895 }
1896 }
1897
1898 // Check stack pages settings
1899 bool Arguments::check_stack_pages()
1900 {
1901 bool status = true;
1902 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1903 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1904 // greater stack shadow pages can't generate instruction to bang stack
1905 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1906 return status;
1907 }
1908
1909 // Check the consistency of vm_init_args
1910 bool Arguments::check_vm_args_consistency() {
1911 // Method for adding checks for flag consistency.
1912 // The intent is to warn the user of all possible conflicts,
1913 // before returning an error.
1914 // Note: Needs platform-dependent factoring.
1915 bool status = true;
1916
1917 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1918 // builds so the cost of stack banging can be measured.
1919 #if (defined(PRODUCT) && defined(SOLARIS))
1920 if (!UseBoundThreads && !UseStackBanging) {
1921 jio_fprintf(defaultStream::error_stream(),
1922 "-UseStackBanging conflicts with -UseBoundThreads\n");
1923
1924 status = false;
1925 }
1926 #endif
1927
1928 if (TLABRefillWasteFraction == 0) {
1929 jio_fprintf(defaultStream::error_stream(),
1930 "TLABRefillWasteFraction should be a denominator, "
1931 "not " SIZE_FORMAT "\n",
1932 TLABRefillWasteFraction);
1933 status = false;
1934 }
1935
1936 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
1937 "AdaptiveSizePolicyWeight");
1938 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1939 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1940 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1941
1942 // Divide by bucket size to prevent a large size from causing rollover when
1943 // calculating amount of memory needed to be allocated for the String table.
1944 status = status && verify_interval(StringTableSize, minimumStringTableSize,
1945 (max_uintx / StringTable::bucket_size()), "StringTable size");
1946
1947 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1948 jio_fprintf(defaultStream::error_stream(),
1949 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1950 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1951 MinHeapFreeRatio, MaxHeapFreeRatio);
1952 status = false;
1953 }
1954 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1955 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1956
1957 // Min/MaxMetaspaceFreeRatio
1958 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
1959 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
1960
1961 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
1962 jio_fprintf(defaultStream::error_stream(),
1963 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
1964 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
1965 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
1966 MinMetaspaceFreeRatio,
1967 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
1968 MaxMetaspaceFreeRatio);
1969 status = false;
1970 }
1971
1972 // Trying to keep 100% free is not practical
1973 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
1974
1975 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1976 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1977 }
1978
1979 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1980 // Settings to encourage splitting.
1981 if (!FLAG_IS_CMDLINE(NewRatio)) {
1982 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
1983 }
1984 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1985 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1986 }
1987 }
1988
1989 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1990 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1991 if (GCTimeLimit == 100) {
1992 // Turn off gc-overhead-limit-exceeded checks
1993 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1994 }
1995
1996 status = status && check_gc_consistency();
1997 status = status && check_stack_pages();
1998
1999 if (CMSIncrementalMode) {
2000 if (!UseConcMarkSweepGC) {
2001 jio_fprintf(defaultStream::error_stream(),
2002 "error: invalid argument combination.\n"
2003 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2004 "selected in order\nto use CMSIncrementalMode.\n");
2005 status = false;
2006 } else {
2007 status = status && verify_percentage(CMSIncrementalDutyCycle,
2008 "CMSIncrementalDutyCycle");
2009 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2010 "CMSIncrementalDutyCycleMin");
2011 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2012 "CMSIncrementalSafetyFactor");
2013 status = status && verify_percentage(CMSIncrementalOffset,
2014 "CMSIncrementalOffset");
2015 status = status && verify_percentage(CMSExpAvgFactor,
2016 "CMSExpAvgFactor");
2017 // If it was not set on the command line, set
2018 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2019 if (CMSInitiatingOccupancyFraction < 0) {
2020 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2021 }
2022 }
2023 }
2024
2025 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2026 // insists that we hold the requisite locks so that the iteration is
2027 // MT-safe. For the verification at start-up and shut-down, we don't
2028 // yet have a good way of acquiring and releasing these locks,
2029 // which are not visible at the CollectedHeap level. We want to
2030 // be able to acquire these locks and then do the iteration rather
2031 // than just disable the lock verification. This will be fixed under
2032 // bug 4788986.
2033 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2034 if (VerifyDuringStartup) {
2035 warning("Heap verification at start-up disabled "
2036 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2037 VerifyDuringStartup = false; // Disable verification at start-up
2038 }
2039
2040 if (VerifyBeforeExit) {
2041 warning("Heap verification at shutdown disabled "
2042 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2043 VerifyBeforeExit = false; // Disable verification at shutdown
2044 }
2045 }
2046
2047 // Note: only executed in non-PRODUCT mode
2048 if (!UseAsyncConcMarkSweepGC &&
2049 (ExplicitGCInvokesConcurrent ||
2050 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2051 jio_fprintf(defaultStream::error_stream(),
2052 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2053 " with -UseAsyncConcMarkSweepGC");
2054 status = false;
2055 }
2056
2057 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2058
2059 #if INCLUDE_ALL_GCS
2060 if (UseG1GC) {
2061 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2062 "InitiatingHeapOccupancyPercent");
2063 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2064 "G1RefProcDrainInterval");
2065 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2066 "G1ConcMarkStepDurationMillis");
2067 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2068 "G1ConcRSHotCardLimit");
2069 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2070 "G1ConcRSLogCacheSize");
2071 }
2072 if (UseConcMarkSweepGC) {
2073 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2074 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2075 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2076 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2077
2078 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2079
2080 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2081 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2082 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2083
2084 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2085
2086 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2087 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2088
2089 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2090 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2091 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2092
2093 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2094
2095 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2096
2097 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2098 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2099 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2100 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2101 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2102 }
2103
2104 if (UseParallelGC || UseParallelOldGC) {
2105 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2106 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2107
2108 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2109 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2110
2111 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2112 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2113
2114 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2115
2116 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2117 }
2118 #endif // INCLUDE_ALL_GCS
2119
2120 status = status && verify_interval(RefDiscoveryPolicy,
2121 ReferenceProcessor::DiscoveryPolicyMin,
2122 ReferenceProcessor::DiscoveryPolicyMax,
2123 "RefDiscoveryPolicy");
2124
2125 // Limit the lower bound of this flag to 1 as it is used in a division
2126 // expression.
2127 status = status && verify_interval(TLABWasteTargetPercent,
2128 1, 100, "TLABWasteTargetPercent");
2129
2130 status = status && verify_object_alignment();
2131
2132 status = status && verify_min_value(ClassMetaspaceSize, 1*M,
2133 "ClassMetaspaceSize");
2134
2135 status = status && verify_interval(MarkStackSizeMax,
2136 1, (max_jint - 1), "MarkStackSizeMax");
2137 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2138
2139 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2140
2141 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2142
2143 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2144
2145 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2146 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2147
2148 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2149
2150 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2151 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2152 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2153 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2154
2155 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2156 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2157
2158 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2159 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2160 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2161
2162 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2163 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2164
2165 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2166 // just for that, so hardcode here.
2167 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2168 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2169 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2170 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2171
2172 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2173 #ifdef SPARC
2174 if (UseConcMarkSweepGC || UseG1GC) {
2175 // Issue a stern warning if the user has explicitly set
2176 // UseMemSetInBOT (it is known to cause issues), but allow
2177 // use for experimentation and debugging.
2178 if (VM_Version::is_sun4v() && UseMemSetInBOT) {
2179 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
2180 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
2181 " on sun4v; please understand that you are using at your own risk!");
2182 }
2183 }
2184 #endif // SPARC
2185
2186 if (PrintNMTStatistics) {
2187 #if INCLUDE_NMT
2188 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2189 #endif // INCLUDE_NMT
2190 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2191 PrintNMTStatistics = false;
2192 #if INCLUDE_NMT
2193 }
2194 #endif
2195 }
2196
2197 // Need to limit the extent of the padding to reasonable size.
2198 // 8K is well beyond the reasonable HW cache line size, even with the
2199 // aggressive prefetching, while still leaving the room for segregating
2200 // among the distinct pages.
2201 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2202 jio_fprintf(defaultStream::error_stream(),
2203 "ContendedPaddingWidth=" INTX_FORMAT " must be the between %d and %d\n",
2204 ContendedPaddingWidth, 0, 8192);
2205 status = false;
2206 }
2207
2208 // Need to enforce the padding not to break the existing field alignments.
2209 // It is sufficient to check against the largest type size.
2210 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2211 jio_fprintf(defaultStream::error_stream(),
2212 "ContendedPaddingWidth=" INTX_FORMAT " must be the multiple of %d\n",
2213 ContendedPaddingWidth, BytesPerLong);
2214 status = false;
2215 }
2216
2217 // Check lower bounds of the code cache
2218 // Template Interpreter code is approximately 3X larger in debug builds.
2219 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2220 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2221 jio_fprintf(defaultStream::error_stream(),
2222 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2223 os::vm_page_size()/K);
2224 status = false;
2225 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2226 jio_fprintf(defaultStream::error_stream(),
2227 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2228 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2229 status = false;
2230 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2231 jio_fprintf(defaultStream::error_stream(),
2232 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2233 min_code_cache_size/K);
2234 status = false;
2235 } else if (ReservedCodeCacheSize > 2*G) {
2236 // Code cache size larger than MAXINT is not supported.
2237 jio_fprintf(defaultStream::error_stream(),
2238 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2239 (2*G)/M);
2240 status = false;
2241 }
2242 return status;
2243 }
2244
2245 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2246 const char* option_type) {
2247 if (ignore) return false;
2248
2249 const char* spacer = " ";
2250 if (option_type == NULL) {
2251 option_type = ++spacer; // Set both to the empty string.
2252 }
2253
2254 if (os::obsolete_option(option)) {
2255 jio_fprintf(defaultStream::error_stream(),
2256 "Obsolete %s%soption: %s\n", option_type, spacer,
2257 option->optionString);
2258 return false;
2259 } else {
2260 jio_fprintf(defaultStream::error_stream(),
2261 "Unrecognized %s%soption: %s\n", option_type, spacer,
2262 option->optionString);
2263 return true;
2264 }
2265 }
2266
2267 static const char* user_assertion_options[] = {
2268 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2269 };
2270
2271 static const char* system_assertion_options[] = {
2272 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2273 };
2274
2275 // Return true if any of the strings in null-terminated array 'names' matches.
2276 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2277 // the option must match exactly.
2278 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2279 bool tail_allowed) {
2280 for (/* empty */; *names != NULL; ++names) {
2281 if (match_option(option, *names, tail)) {
2282 if (**tail == '\0' || tail_allowed && **tail == ':') {
2283 return true;
2284 }
2285 }
2286 }
2287 return false;
2288 }
2289
2290 bool Arguments::parse_uintx(const char* value,
2291 uintx* uintx_arg,
2292 uintx min_size) {
2293
2294 // Check the sign first since atomull() parses only unsigned values.
2295 bool value_is_positive = !(*value == '-');
2296
2297 if (value_is_positive) {
2298 julong n;
2299 bool good_return = atomull(value, &n);
2300 if (good_return) {
2301 bool above_minimum = n >= min_size;
2302 bool value_is_too_large = n > max_uintx;
2303
2304 if (above_minimum && !value_is_too_large) {
2305 *uintx_arg = n;
2306 return true;
2307 }
2308 }
2309 }
2310 return false;
2311 }
2312
2313 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2314 julong* long_arg,
2315 julong min_size) {
2316 if (!atomull(s, long_arg)) return arg_unreadable;
2317 return check_memory_size(*long_arg, min_size);
2318 }
2319
2320 // Parse JavaVMInitArgs structure
2321
2322 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2323 // For components of the system classpath.
2324 SysClassPath scp(Arguments::get_sysclasspath());
2325 bool scp_assembly_required = false;
2326
2327 // Save default settings for some mode flags
2328 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2329 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2330 Arguments::_ClipInlining = ClipInlining;
2331 Arguments::_BackgroundCompilation = BackgroundCompilation;
2332
2333 // Setup flags for mixed which is the default
2334 set_mode_flags(_mixed);
2335
2336 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2337 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2338 if (result != JNI_OK) {
2339 return result;
2340 }
2341
2342 // Parse JavaVMInitArgs structure passed in
2343 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2344 if (result != JNI_OK) {
2345 return result;
2346 }
2347
2348 if (AggressiveOpts) {
2349 // Insert alt-rt.jar between user-specified bootclasspath
2350 // prefix and the default bootclasspath. os::set_boot_path()
2351 // uses meta_index_dir as the default bootclasspath directory.
2352 const char* altclasses_jar = "alt-rt.jar";
2353 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2354 strlen(altclasses_jar);
2355 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal);
2356 strcpy(altclasses_path, get_meta_index_dir());
2357 strcat(altclasses_path, altclasses_jar);
2358 scp.add_suffix_to_prefix(altclasses_path);
2359 scp_assembly_required = true;
2360 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal);
2361 }
2362
2363 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2364 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2365 if (result != JNI_OK) {
2366 return result;
2367 }
2368
2369 // Do final processing now that all arguments have been parsed
2370 result = finalize_vm_init_args(&scp, scp_assembly_required);
2371 if (result != JNI_OK) {
2372 return result;
2373 }
2374
2375 return JNI_OK;
2376 }
2377
2378 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2379 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2380 // are dealing with -agentpath (case where name is a path), otherwise with
2381 // -agentlib
2382 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2383 char *_name;
2384 const char *_hprof = "hprof", *_jdwp = "jdwp";
2385 size_t _len_hprof, _len_jdwp, _len_prefix;
2386
2387 if (is_path) {
2388 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2389 return false;
2390 }
2391
2392 _name++; // skip past last path separator
2393 _len_prefix = strlen(JNI_LIB_PREFIX);
2394
2395 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2396 return false;
2397 }
2398
2399 _name += _len_prefix;
2400 _len_hprof = strlen(_hprof);
2401 _len_jdwp = strlen(_jdwp);
2402
2403 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2404 _name += _len_hprof;
2405 }
2406 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2407 _name += _len_jdwp;
2408 }
2409 else {
2410 return false;
2411 }
2412
2413 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2414 return false;
2415 }
2416
2417 return true;
2418 }
2419
2420 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2421 return true;
2422 }
2423
2424 return false;
2425 }
2426
2427 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2428 SysClassPath* scp_p,
2429 bool* scp_assembly_required_p,
2430 FlagValueOrigin origin) {
2431 // Remaining part of option string
2432 const char* tail;
2433
2434 // iterate over arguments
2435 for (int index = 0; index < args->nOptions; index++) {
2436 bool is_absolute_path = false; // for -agentpath vs -agentlib
2437
2438 const JavaVMOption* option = args->options + index;
2439
2440 if (!match_option(option, "-Djava.class.path", &tail) &&
2441 !match_option(option, "-Dsun.java.command", &tail) &&
2442 !match_option(option, "-Dsun.java.launcher", &tail)) {
2443
2444 // add all jvm options to the jvm_args string. This string
2445 // is used later to set the java.vm.args PerfData string constant.
2446 // the -Djava.class.path and the -Dsun.java.command options are
2447 // omitted from jvm_args string as each have their own PerfData
2448 // string constant object.
2449 build_jvm_args(option->optionString);
2450 }
2451
2452 // -verbose:[class/gc/jni]
2453 if (match_option(option, "-verbose", &tail)) {
2454 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2455 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2456 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2457 } else if (!strcmp(tail, ":gc")) {
2458 FLAG_SET_CMDLINE(bool, PrintGC, true);
2459 } else if (!strcmp(tail, ":jni")) {
2460 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2461 }
2462 // -da / -ea / -disableassertions / -enableassertions
2463 // These accept an optional class/package name separated by a colon, e.g.,
2464 // -da:java.lang.Thread.
2465 } else if (match_option(option, user_assertion_options, &tail, true)) {
2466 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2467 if (*tail == '\0') {
2468 JavaAssertions::setUserClassDefault(enable);
2469 } else {
2470 assert(*tail == ':', "bogus match by match_option()");
2471 JavaAssertions::addOption(tail + 1, enable);
2472 }
2473 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2474 } else if (match_option(option, system_assertion_options, &tail, false)) {
2475 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2476 JavaAssertions::setSystemClassDefault(enable);
2477 // -bootclasspath:
2478 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2479 scp_p->reset_path(tail);
2480 *scp_assembly_required_p = true;
2481 // -bootclasspath/a:
2482 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2483 scp_p->add_suffix(tail);
2484 *scp_assembly_required_p = true;
2485 // -bootclasspath/p:
2486 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2487 scp_p->add_prefix(tail);
2488 *scp_assembly_required_p = true;
2489 // -Xrun
2490 } else if (match_option(option, "-Xrun", &tail)) {
2491 if (tail != NULL) {
2492 const char* pos = strchr(tail, ':');
2493 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2494 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2495 name[len] = '\0';
2496
2497 char *options = NULL;
2498 if(pos != NULL) {
2499 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2500 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2501 }
2502 #if !INCLUDE_JVMTI
2503 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2504 jio_fprintf(defaultStream::error_stream(),
2505 "Profiling and debugging agents are not supported in this VM\n");
2506 return JNI_ERR;
2507 }
2508 #endif // !INCLUDE_JVMTI
2509 add_init_library(name, options);
2510 }
2511 // -agentlib and -agentpath
2512 } else if (match_option(option, "-agentlib:", &tail) ||
2513 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2514 if(tail != NULL) {
2515 const char* pos = strchr(tail, '=');
2516 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2517 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2518 name[len] = '\0';
2519
2520 char *options = NULL;
2521 if(pos != NULL) {
2522 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2523 }
2524 #if !INCLUDE_JVMTI
2525 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2526 jio_fprintf(defaultStream::error_stream(),
2527 "Profiling and debugging agents are not supported in this VM\n");
2528 return JNI_ERR;
2529 }
2530 #endif // !INCLUDE_JVMTI
2531 add_init_agent(name, options, is_absolute_path);
2532 }
2533 // -javaagent
2534 } else if (match_option(option, "-javaagent:", &tail)) {
2535 #if !INCLUDE_JVMTI
2536 jio_fprintf(defaultStream::error_stream(),
2537 "Instrumentation agents are not supported in this VM\n");
2538 return JNI_ERR;
2539 #else
2540 if(tail != NULL) {
2541 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2542 add_init_agent("instrument", options, false);
2543 }
2544 #endif // !INCLUDE_JVMTI
2545 // -Xnoclassgc
2546 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2547 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2548 // -Xincgc: i-CMS
2549 } else if (match_option(option, "-Xincgc", &tail)) {
2550 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2551 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2552 // -Xnoincgc: no i-CMS
2553 } else if (match_option(option, "-Xnoincgc", &tail)) {
2554 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2555 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2556 // -Xconcgc
2557 } else if (match_option(option, "-Xconcgc", &tail)) {
2558 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2559 // -Xnoconcgc
2560 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2561 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2562 // -Xbatch
2563 } else if (match_option(option, "-Xbatch", &tail)) {
2564 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2565 // -Xmn for compatibility with other JVM vendors
2566 } else if (match_option(option, "-Xmn", &tail)) {
2567 julong long_initial_eden_size = 0;
2568 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2569 if (errcode != arg_in_range) {
2570 jio_fprintf(defaultStream::error_stream(),
2571 "Invalid initial eden size: %s\n", option->optionString);
2572 describe_range_error(errcode);
2573 return JNI_EINVAL;
2574 }
2575 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2576 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2577 // -Xms
2578 } else if (match_option(option, "-Xms", &tail)) {
2579 julong long_initial_heap_size = 0;
2580 // an initial heap size of 0 means automatically determine
2581 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2582 if (errcode != arg_in_range) {
2583 jio_fprintf(defaultStream::error_stream(),
2584 "Invalid initial heap size: %s\n", option->optionString);
2585 describe_range_error(errcode);
2586 return JNI_EINVAL;
2587 }
2588 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2589 // Currently the minimum size and the initial heap sizes are the same.
2590 set_min_heap_size(InitialHeapSize);
2591 // -Xmx
2592 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2593 julong long_max_heap_size = 0;
2594 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2595 if (errcode != arg_in_range) {
2596 jio_fprintf(defaultStream::error_stream(),
2597 "Invalid maximum heap size: %s\n", option->optionString);
2598 describe_range_error(errcode);
2599 return JNI_EINVAL;
2600 }
2601 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2602 // Xmaxf
2603 } else if (match_option(option, "-Xmaxf", &tail)) {
2604 int maxf = (int)(atof(tail) * 100);
2605 if (maxf < 0 || maxf > 100) {
2606 jio_fprintf(defaultStream::error_stream(),
2607 "Bad max heap free percentage size: %s\n",
2608 option->optionString);
2609 return JNI_EINVAL;
2610 } else {
2611 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2612 }
2613 // Xminf
2614 } else if (match_option(option, "-Xminf", &tail)) {
2615 int minf = (int)(atof(tail) * 100);
2616 if (minf < 0 || minf > 100) {
2617 jio_fprintf(defaultStream::error_stream(),
2618 "Bad min heap free percentage size: %s\n",
2619 option->optionString);
2620 return JNI_EINVAL;
2621 } else {
2622 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2623 }
2624 // -Xss
2625 } else if (match_option(option, "-Xss", &tail)) {
2626 julong long_ThreadStackSize = 0;
2627 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2628 if (errcode != arg_in_range) {
2629 jio_fprintf(defaultStream::error_stream(),
2630 "Invalid thread stack size: %s\n", option->optionString);
2631 describe_range_error(errcode);
2632 return JNI_EINVAL;
2633 }
2634 // Internally track ThreadStackSize in units of 1024 bytes.
2635 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2636 round_to((int)long_ThreadStackSize, K) / K);
2637 // -Xoss
2638 } else if (match_option(option, "-Xoss", &tail)) {
2639 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2640 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2641 julong long_CodeCacheExpansionSize = 0;
2642 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2643 if (errcode != arg_in_range) {
2644 jio_fprintf(defaultStream::error_stream(),
2645 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2646 os::vm_page_size()/K);
2647 return JNI_EINVAL;
2648 }
2649 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2650 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2651 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2652 julong long_ReservedCodeCacheSize = 0;
2653
2654 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2655 if (errcode != arg_in_range) {
2656 jio_fprintf(defaultStream::error_stream(),
2657 "Invalid maximum code cache size: %s.\n", option->optionString);
2658 return JNI_EINVAL;
2659 }
2660 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2661 //-XX:IncreaseFirstTierCompileThresholdAt=
2662 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2663 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2664 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2665 jio_fprintf(defaultStream::error_stream(),
2666 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2667 option->optionString);
2668 return JNI_EINVAL;
2669 }
2670 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2671 // -green
2672 } else if (match_option(option, "-green", &tail)) {
2673 jio_fprintf(defaultStream::error_stream(),
2674 "Green threads support not available\n");
2675 return JNI_EINVAL;
2676 // -native
2677 } else if (match_option(option, "-native", &tail)) {
2678 // HotSpot always uses native threads, ignore silently for compatibility
2679 // -Xsqnopause
2680 } else if (match_option(option, "-Xsqnopause", &tail)) {
2681 // EVM option, ignore silently for compatibility
2682 // -Xrs
2683 } else if (match_option(option, "-Xrs", &tail)) {
2684 // Classic/EVM option, new functionality
2685 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2686 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2687 // change default internal VM signals used - lower case for back compat
2688 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2689 // -Xoptimize
2690 } else if (match_option(option, "-Xoptimize", &tail)) {
2691 // EVM option, ignore silently for compatibility
2692 // -Xprof
2693 } else if (match_option(option, "-Xprof", &tail)) {
2694 #if INCLUDE_FPROF
2695 _has_profile = true;
2696 #else // INCLUDE_FPROF
2697 jio_fprintf(defaultStream::error_stream(),
2698 "Flat profiling is not supported in this VM.\n");
2699 return JNI_ERR;
2700 #endif // INCLUDE_FPROF
2701 // -Xconcurrentio
2702 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2703 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2704 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2705 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2706 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2707 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2708
2709 // -Xinternalversion
2710 } else if (match_option(option, "-Xinternalversion", &tail)) {
2711 jio_fprintf(defaultStream::output_stream(), "%s\n",
2712 VM_Version::internal_vm_info_string());
2713 vm_exit(0);
2714 #ifndef PRODUCT
2715 // -Xprintflags
2716 } else if (match_option(option, "-Xprintflags", &tail)) {
2717 CommandLineFlags::printFlags(tty, false);
2718 vm_exit(0);
2719 #endif
2720 // -D
2721 } else if (match_option(option, "-D", &tail)) {
2722 if (!add_property(tail)) {
2723 return JNI_ENOMEM;
2724 }
2725 // Out of the box management support
2726 if (match_option(option, "-Dcom.sun.management", &tail)) {
2727 #if INCLUDE_MANAGEMENT
2728 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2729 #else
2730 jio_fprintf(defaultStream::output_stream(),
2731 "-Dcom.sun.management is not supported in this VM.\n");
2732 return JNI_ERR;
2733 #endif
2734 }
2735 // -Xint
2736 } else if (match_option(option, "-Xint", &tail)) {
2737 set_mode_flags(_int);
2738 // -Xmixed
2739 } else if (match_option(option, "-Xmixed", &tail)) {
2740 set_mode_flags(_mixed);
2741 // -Xcomp
2742 } else if (match_option(option, "-Xcomp", &tail)) {
2743 // for testing the compiler; turn off all flags that inhibit compilation
2744 set_mode_flags(_comp);
2745 // -Xshare:dump
2746 } else if (match_option(option, "-Xshare:dump", &tail)) {
2747 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2748 set_mode_flags(_int); // Prevent compilation, which creates objects
2749 // -Xshare:on
2750 } else if (match_option(option, "-Xshare:on", &tail)) {
2751 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2752 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2753 // -Xshare:auto
2754 } else if (match_option(option, "-Xshare:auto", &tail)) {
2755 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2756 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2757 // -Xshare:off
2758 } else if (match_option(option, "-Xshare:off", &tail)) {
2759 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2760 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2761 // -Xverify
2762 } else if (match_option(option, "-Xverify", &tail)) {
2763 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2764 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2765 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2766 } else if (strcmp(tail, ":remote") == 0) {
2767 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2768 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2769 } else if (strcmp(tail, ":none") == 0) {
2770 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2771 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2772 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2773 return JNI_EINVAL;
2774 }
2775 // -Xdebug
2776 } else if (match_option(option, "-Xdebug", &tail)) {
2777 // note this flag has been used, then ignore
2778 set_xdebug_mode(true);
2779 // -Xnoagent
2780 } else if (match_option(option, "-Xnoagent", &tail)) {
2781 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2782 } else if (match_option(option, "-Xboundthreads", &tail)) {
2783 // Bind user level threads to kernel threads (Solaris only)
2784 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2785 } else if (match_option(option, "-Xloggc:", &tail)) {
2786 // Redirect GC output to the file. -Xloggc:<filename>
2787 // ostream_init_log(), when called will use this filename
2788 // to initialize a fileStream.
2789 _gc_log_filename = strdup(tail);
2790 FLAG_SET_CMDLINE(bool, PrintGC, true);
2791 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2792
2793 // JNI hooks
2794 } else if (match_option(option, "-Xcheck", &tail)) {
2795 if (!strcmp(tail, ":jni")) {
2796 #if !INCLUDE_JNI_CHECK
2797 warning("JNI CHECKING is not supported in this VM");
2798 #else
2799 CheckJNICalls = true;
2800 #endif // INCLUDE_JNI_CHECK
2801 } else if (is_bad_option(option, args->ignoreUnrecognized,
2802 "check")) {
2803 return JNI_EINVAL;
2804 }
2805 } else if (match_option(option, "vfprintf", &tail)) {
2806 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2807 } else if (match_option(option, "exit", &tail)) {
2808 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2809 } else if (match_option(option, "abort", &tail)) {
2810 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2811 // -XX:+AggressiveHeap
2812 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2813
2814 // This option inspects the machine and attempts to set various
2815 // parameters to be optimal for long-running, memory allocation
2816 // intensive jobs. It is intended for machines with large
2817 // amounts of cpu and memory.
2818
2819 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2820 // VM, but we may not be able to represent the total physical memory
2821 // available (like having 8gb of memory on a box but using a 32bit VM).
2822 // Thus, we need to make sure we're using a julong for intermediate
2823 // calculations.
2824 julong initHeapSize;
2825 julong total_memory = os::physical_memory();
2826
2827 if (total_memory < (julong)256*M) {
2828 jio_fprintf(defaultStream::error_stream(),
2829 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2830 vm_exit(1);
2831 }
2832
2833 // The heap size is half of available memory, or (at most)
2834 // all of possible memory less 160mb (leaving room for the OS
2835 // when using ISM). This is the maximum; because adaptive sizing
2836 // is turned on below, the actual space used may be smaller.
2837
2838 initHeapSize = MIN2(total_memory / (julong)2,
2839 total_memory - (julong)160*M);
2840
2841 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2842
2843 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2844 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2845 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2846 // Currently the minimum size and the initial heap sizes are the same.
2847 set_min_heap_size(initHeapSize);
2848 }
2849 if (FLAG_IS_DEFAULT(NewSize)) {
2850 // Make the young generation 3/8ths of the total heap.
2851 FLAG_SET_CMDLINE(uintx, NewSize,
2852 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2853 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2854 }
2855
2856 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2857 FLAG_SET_DEFAULT(UseLargePages, true);
2858 #endif
2859
2860 // Increase some data structure sizes for efficiency
2861 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2862 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2863 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2864
2865 // See the OldPLABSize comment below, but replace 'after promotion'
2866 // with 'after copying'. YoungPLABSize is the size of the survivor
2867 // space per-gc-thread buffers. The default is 4kw.
2868 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2869
2870 // OldPLABSize is the size of the buffers in the old gen that
2871 // UseParallelGC uses to promote live data that doesn't fit in the
2872 // survivor spaces. At any given time, there's one for each gc thread.
2873 // The default size is 1kw. These buffers are rarely used, since the
2874 // survivor spaces are usually big enough. For specjbb, however, there
2875 // are occasions when there's lots of live data in the young gen
2876 // and we end up promoting some of it. We don't have a definite
2877 // explanation for why bumping OldPLABSize helps, but the theory
2878 // is that a bigger PLAB results in retaining something like the
2879 // original allocation order after promotion, which improves mutator
2880 // locality. A minor effect may be that larger PLABs reduce the
2881 // number of PLAB allocation events during gc. The value of 8kw
2882 // was arrived at by experimenting with specjbb.
2883 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2884
2885 // Enable parallel GC and adaptive generation sizing
2886 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2887 FLAG_SET_DEFAULT(ParallelGCThreads,
2888 Abstract_VM_Version::parallel_worker_threads());
2889
2890 // Encourage steady state memory management
2891 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2892
2893 // This appears to improve mutator locality
2894 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2895
2896 // Get around early Solaris scheduling bug
2897 // (affinity vs other jobs on system)
2898 // but disallow DR and offlining (5008695).
2899 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2900
2901 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2902 // The last option must always win.
2903 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2904 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2905 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2906 // The last option must always win.
2907 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2908 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2909 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2910 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2911 jio_fprintf(defaultStream::error_stream(),
2912 "Please use CMSClassUnloadingEnabled in place of "
2913 "CMSPermGenSweepingEnabled in the future\n");
2914 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2915 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2916 jio_fprintf(defaultStream::error_stream(),
2917 "Please use -XX:+UseGCOverheadLimit in place of "
2918 "-XX:+UseGCTimeLimit in the future\n");
2919 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2920 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2921 jio_fprintf(defaultStream::error_stream(),
2922 "Please use -XX:-UseGCOverheadLimit in place of "
2923 "-XX:-UseGCTimeLimit in the future\n");
2924 // The TLE options are for compatibility with 1.3 and will be
2925 // removed without notice in a future release. These options
2926 // are not to be documented.
2927 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2928 // No longer used.
2929 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2930 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2931 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2932 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2933 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2934 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2935 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2936 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2937 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2938 // No longer used.
2939 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2940 julong long_tlab_size = 0;
2941 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2942 if (errcode != arg_in_range) {
2943 jio_fprintf(defaultStream::error_stream(),
2944 "Invalid TLAB size: %s\n", option->optionString);
2945 describe_range_error(errcode);
2946 return JNI_EINVAL;
2947 }
2948 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2949 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2950 // No longer used.
2951 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2952 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2953 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2954 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2955 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2956 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2957 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2958 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2959 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2960 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2961 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2962 #if defined(DTRACE_ENABLED)
2963 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2964 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2965 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2966 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2967 #else // defined(DTRACE_ENABLED)
2968 jio_fprintf(defaultStream::error_stream(),
2969 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2970 return JNI_EINVAL;
2971 #endif // defined(DTRACE_ENABLED)
2972 #ifdef ASSERT
2973 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2974 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2975 // disable scavenge before parallel mark-compact
2976 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2977 #endif
2978 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2979 julong cms_blocks_to_claim = (julong)atol(tail);
2980 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2981 jio_fprintf(defaultStream::error_stream(),
2982 "Please use -XX:OldPLABSize in place of "
2983 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2984 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2985 julong cms_blocks_to_claim = (julong)atol(tail);
2986 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2987 jio_fprintf(defaultStream::error_stream(),
2988 "Please use -XX:OldPLABSize in place of "
2989 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2990 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2991 julong old_plab_size = 0;
2992 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2993 if (errcode != arg_in_range) {
2994 jio_fprintf(defaultStream::error_stream(),
2995 "Invalid old PLAB size: %s\n", option->optionString);
2996 describe_range_error(errcode);
2997 return JNI_EINVAL;
2998 }
2999 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3000 jio_fprintf(defaultStream::error_stream(),
3001 "Please use -XX:OldPLABSize in place of "
3002 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3003 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3004 julong young_plab_size = 0;
3005 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3006 if (errcode != arg_in_range) {
3007 jio_fprintf(defaultStream::error_stream(),
3008 "Invalid young PLAB size: %s\n", option->optionString);
3009 describe_range_error(errcode);
3010 return JNI_EINVAL;
3011 }
3012 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3013 jio_fprintf(defaultStream::error_stream(),
3014 "Please use -XX:YoungPLABSize in place of "
3015 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3016 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3017 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3018 julong stack_size = 0;
3019 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3020 if (errcode != arg_in_range) {
3021 jio_fprintf(defaultStream::error_stream(),
3022 "Invalid mark stack size: %s\n", option->optionString);
3023 describe_range_error(errcode);
3024 return JNI_EINVAL;
3025 }
3026 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3027 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3028 julong max_stack_size = 0;
3029 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3030 if (errcode != arg_in_range) {
3031 jio_fprintf(defaultStream::error_stream(),
3032 "Invalid maximum mark stack size: %s\n",
3033 option->optionString);
3034 describe_range_error(errcode);
3035 return JNI_EINVAL;
3036 }
3037 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3038 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3039 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3040 uintx conc_threads = 0;
3041 if (!parse_uintx(tail, &conc_threads, 1)) {
3042 jio_fprintf(defaultStream::error_stream(),
3043 "Invalid concurrent threads: %s\n", option->optionString);
3044 return JNI_EINVAL;
3045 }
3046 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3047 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3048 julong max_direct_memory_size = 0;
3049 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3050 if (errcode != arg_in_range) {
3051 jio_fprintf(defaultStream::error_stream(),
3052 "Invalid maximum direct memory size: %s\n",
3053 option->optionString);
3054 describe_range_error(errcode);
3055 return JNI_EINVAL;
3056 }
3057 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3058 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3059 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3060 // away and will cause VM initialization failures!
3061 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3062 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3063 #if !INCLUDE_MANAGEMENT
3064 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3065 jio_fprintf(defaultStream::error_stream(),
3066 "ManagementServer is not supported in this VM.\n");
3067 return JNI_ERR;
3068 #endif // INCLUDE_MANAGEMENT
3069 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3070 // Skip -XX:Flags= since that case has already been handled
3071 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3072 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3073 return JNI_EINVAL;
3074 }
3075 }
3076 // Unknown option
3077 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3078 return JNI_ERR;
3079 }
3080 }
3081
3082 // Change the default value for flags which have different default values
3083 // when working with older JDKs.
3084 #ifdef LINUX
3085 if (JDK_Version::current().compare_major(6) <= 0 &&
3086 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3087 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3088 }
3089 #endif // LINUX
3090 return JNI_OK;
3091 }
3092
3093 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3094 // This must be done after all -D arguments have been processed.
3095 scp_p->expand_endorsed();
3096
3097 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3098 // Assemble the bootclasspath elements into the final path.
3099 Arguments::set_sysclasspath(scp_p->combined_path());
3100 }
3101
3102 // This must be done after all arguments have been processed.
3103 // java_compiler() true means set to "NONE" or empty.
3104 if (java_compiler() && !xdebug_mode()) {
3105 // For backwards compatibility, we switch to interpreted mode if
3106 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3107 // not specified.
3108 set_mode_flags(_int);
3109 }
3110 if (CompileThreshold == 0) {
3111 set_mode_flags(_int);
3112 }
3113
3114 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3115 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3116 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3117 }
3118
3119 #ifndef COMPILER2
3120 // Don't degrade server performance for footprint
3121 if (FLAG_IS_DEFAULT(UseLargePages) &&
3122 MaxHeapSize < LargePageHeapSizeThreshold) {
3123 // No need for large granularity pages w/small heaps.
3124 // Note that large pages are enabled/disabled for both the
3125 // Java heap and the code cache.
3126 FLAG_SET_DEFAULT(UseLargePages, false);
3127 }
3128
3129 // Tiered compilation is undefined with C1.
3130 TieredCompilation = false;
3131 #else
3132 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3133 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3134 }
3135 #endif
3136
3137 // If we are running in a headless jre, force java.awt.headless property
3138 // to be true unless the property has already been set.
3139 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3140 if (os::is_headless_jre()) {
3141 const char* headless = Arguments::get_property("java.awt.headless");
3142 if (headless == NULL) {
3143 char envbuffer[128];
3144 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3145 if (!add_property("java.awt.headless=true")) {
3146 return JNI_ENOMEM;
3147 }
3148 } else {
3149 char buffer[256];
3150 strcpy(buffer, "java.awt.headless=");
3151 strcat(buffer, envbuffer);
3152 if (!add_property(buffer)) {
3153 return JNI_ENOMEM;
3154 }
3155 }
3156 }
3157 }
3158
3159 if (!check_vm_args_consistency()) {
3160 return JNI_ERR;
3161 }
3162
3163 return JNI_OK;
3164 }
3165
3166 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3167 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3168 scp_assembly_required_p);
3169 }
3170
3171 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3172 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3173 scp_assembly_required_p);
3174 }
3175
3176 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3177 const int N_MAX_OPTIONS = 64;
3178 const int OPTION_BUFFER_SIZE = 1024;
3179 char buffer[OPTION_BUFFER_SIZE];
3180
3181 // The variable will be ignored if it exceeds the length of the buffer.
3182 // Don't check this variable if user has special privileges
3183 // (e.g. unix su command).
3184 if (os::getenv(name, buffer, sizeof(buffer)) &&
3185 !os::have_special_privileges()) {
3186 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3187 jio_fprintf(defaultStream::error_stream(),
3188 "Picked up %s: %s\n", name, buffer);
3189 char* rd = buffer; // pointer to the input string (rd)
3190 int i;
3191 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3192 while (isspace(*rd)) rd++; // skip whitespace
3193 if (*rd == 0) break; // we re done when the input string is read completely
3194
3195 // The output, option string, overwrites the input string.
3196 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3197 // input string (rd).
3198 char* wrt = rd;
3199
3200 options[i++].optionString = wrt; // Fill in option
3201 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3202 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3203 int quote = *rd; // matching quote to look for
3204 rd++; // don't copy open quote
3205 while (*rd != quote) { // include everything (even spaces) up until quote
3206 if (*rd == 0) { // string termination means unmatched string
3207 jio_fprintf(defaultStream::error_stream(),
3208 "Unmatched quote in %s\n", name);
3209 return JNI_ERR;
3210 }
3211 *wrt++ = *rd++; // copy to option string
3212 }
3213 rd++; // don't copy close quote
3214 } else {
3215 *wrt++ = *rd++; // copy to option string
3216 }
3217 }
3218 // Need to check if we're done before writing a NULL,
3219 // because the write could be to the byte that rd is pointing to.
3220 if (*rd++ == 0) {
3221 *wrt = 0;
3222 break;
3223 }
3224 *wrt = 0; // Zero terminate option
3225 }
3226 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3227 JavaVMInitArgs vm_args;
3228 vm_args.version = JNI_VERSION_1_2;
3229 vm_args.options = options;
3230 vm_args.nOptions = i;
3231 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3232
3233 if (PrintVMOptions) {
3234 const char* tail;
3235 for (int i = 0; i < vm_args.nOptions; i++) {
3236 const JavaVMOption *option = vm_args.options + i;
3237 if (match_option(option, "-XX:", &tail)) {
3238 logOption(tail);
3239 }
3240 }
3241 }
3242
3243 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
3244 }
3245 return JNI_OK;
3246 }
3247
3248 void Arguments::set_shared_spaces_flags() {
3249 #ifdef _LP64
3250 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
3251
3252 // CompressedOops cannot be used with CDS. The offsets of oopmaps and
3253 // static fields are incorrect in the archive. With some more clever
3254 // initialization, this restriction can probably be lifted.
3255 if (UseCompressedOops) {
3256 if (must_share) {
3257 warning("disabling compressed oops because of %s",
3258 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
3259 FLAG_SET_CMDLINE(bool, UseCompressedOops, false);
3260 FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false);
3261 } else {
3262 // Prefer compressed oops to class data sharing
3263 if (UseSharedSpaces && Verbose) {
3264 warning("turning off use of shared archive because of compressed oops");
3265 }
3266 no_shared_spaces();
3267 }
3268 }
3269 #endif
3270
3271 if (DumpSharedSpaces) {
3272 if (RequireSharedSpaces) {
3273 warning("cannot dump shared archive while using shared archive");
3274 }
3275 UseSharedSpaces = false;
3276 }
3277 }
3278
3279 // Disable options not supported in this release, with a warning if they
3280 // were explicitly requested on the command-line
3281 #define UNSUPPORTED_OPTION(opt, description) \
3282 do { \
3283 if (opt) { \
3284 if (FLAG_IS_CMDLINE(opt)) { \
3285 warning(description " is disabled in this release."); \
3286 } \
3287 FLAG_SET_DEFAULT(opt, false); \
3288 } \
3289 } while(0)
3290
3291
3292 #define UNSUPPORTED_GC_OPTION(gc) \
3293 do { \
3294 if (gc) { \
3295 if (FLAG_IS_CMDLINE(gc)) { \
3296 warning(#gc " is not supported in this VM. Using Serial GC."); \
3297 } \
3298 FLAG_SET_DEFAULT(gc, false); \
3299 } \
3300 } while(0)
3301
3302 #if !INCLUDE_ALL_GCS
3303 static void force_serial_gc() {
3304 FLAG_SET_DEFAULT(UseSerialGC, true);
3305 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3306 UNSUPPORTED_GC_OPTION(UseG1GC);
3307 UNSUPPORTED_GC_OPTION(UseParallelGC);
3308 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3309 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3310 UNSUPPORTED_GC_OPTION(UseParNewGC);
3311 }
3312 #endif // INCLUDE_ALL_GCS
3313
3314 // Sharing support
3315 // Construct the path to the archive
3316 static char* get_shared_archive_path() {
3317 char *shared_archive_path;
3318 if (SharedArchiveFile == NULL) {
3319 char jvm_path[JVM_MAXPATHLEN];
3320 os::jvm_path(jvm_path, sizeof(jvm_path));
3321 char *end = strrchr(jvm_path, *os::file_separator());
3322 if (end != NULL) *end = '\0';
3323 size_t jvm_path_len = strlen(jvm_path);
3324 size_t file_sep_len = strlen(os::file_separator());
3325 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3326 file_sep_len + 20, mtInternal);
3327 if (shared_archive_path != NULL) {
3328 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3329 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3330 strncat(shared_archive_path, "classes.jsa", 11);
3331 }
3332 } else {
3333 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3334 if (shared_archive_path != NULL) {
3335 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3336 }
3337 }
3338 return shared_archive_path;
3339 }
3340
3341 // Parse entry point called from JNI_CreateJavaVM
3342
3343 jint Arguments::parse(const JavaVMInitArgs* args) {
3344
3345 // Remaining part of option string
3346 const char* tail;
3347
3348 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3349 const char* hotspotrc = ".hotspotrc";
3350 bool settings_file_specified = false;
3351 bool needs_hotspotrc_warning = false;
3352
3353 const char* flags_file;
3354 int index;
3355 for (index = 0; index < args->nOptions; index++) {
3356 const JavaVMOption *option = args->options + index;
3357 if (match_option(option, "-XX:Flags=", &tail)) {
3358 flags_file = tail;
3359 settings_file_specified = true;
3360 }
3361 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3362 PrintVMOptions = true;
3363 }
3364 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3365 PrintVMOptions = false;
3366 }
3367 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3368 IgnoreUnrecognizedVMOptions = true;
3369 }
3370 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3371 IgnoreUnrecognizedVMOptions = false;
3372 }
3373 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3374 CommandLineFlags::printFlags(tty, false);
3375 vm_exit(0);
3376 }
3377 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3378 #if INCLUDE_NMT
3379 MemTracker::init_tracking_options(tail);
3380 #else
3381 jio_fprintf(defaultStream::error_stream(),
3382 "Native Memory Tracking is not supported in this VM\n");
3383 return JNI_ERR;
3384 #endif
3385 }
3386
3387
3388 #ifndef PRODUCT
3389 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3390 CommandLineFlags::printFlags(tty, true);
3391 vm_exit(0);
3392 }
3393 #endif
3394 }
3395
3396 if (IgnoreUnrecognizedVMOptions) {
3397 // uncast const to modify the flag args->ignoreUnrecognized
3398 *(jboolean*)(&args->ignoreUnrecognized) = true;
3399 }
3400
3401 // Parse specified settings file
3402 if (settings_file_specified) {
3403 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3404 return JNI_EINVAL;
3405 }
3406 } else {
3407 #ifdef ASSERT
3408 // Parse default .hotspotrc settings file
3409 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3410 return JNI_EINVAL;
3411 }
3412 #else
3413 struct stat buf;
3414 if (os::stat(hotspotrc, &buf) == 0) {
3415 needs_hotspotrc_warning = true;
3416 }
3417 #endif
3418 }
3419
3420 if (PrintVMOptions) {
3421 for (index = 0; index < args->nOptions; index++) {
3422 const JavaVMOption *option = args->options + index;
3423 if (match_option(option, "-XX:", &tail)) {
3424 logOption(tail);
3425 }
3426 }
3427 }
3428
3429 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3430 jint result = parse_vm_init_args(args);
3431 if (result != JNI_OK) {
3432 return result;
3433 }
3434
3435 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3436 SharedArchivePath = get_shared_archive_path();
3437 if (SharedArchivePath == NULL) {
3438 return JNI_ENOMEM;
3439 }
3440
3441 // Delay warning until here so that we've had a chance to process
3442 // the -XX:-PrintWarnings flag
3443 if (needs_hotspotrc_warning) {
3444 warning("%s file is present but has been ignored. "
3445 "Run with -XX:Flags=%s to load the file.",
3446 hotspotrc, hotspotrc);
3447 }
3448
3449 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3450 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3451 #endif
3452
3453 #if INCLUDE_ALL_GCS
3454 #if (defined JAVASE_EMBEDDED || defined ARM)
3455 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3456 #endif
3457 #endif
3458
3459 #ifndef PRODUCT
3460 if (TraceBytecodesAt != 0) {
3461 TraceBytecodes = true;
3462 }
3463 if (CountCompiledCalls) {
3464 if (UseCounterDecay) {
3465 warning("UseCounterDecay disabled because CountCalls is set");
3466 UseCounterDecay = false;
3467 }
3468 }
3469 #endif // PRODUCT
3470
3471 // JSR 292 is not supported before 1.7
3472 if (!JDK_Version::is_gte_jdk17x_version()) {
3473 if (EnableInvokeDynamic) {
3474 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3475 warning("JSR 292 is not supported before 1.7. Disabling support.");
3476 }
3477 EnableInvokeDynamic = false;
3478 }
3479 }
3480
3481 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3482 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3483 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3484 }
3485 ScavengeRootsInCode = 1;
3486 }
3487
3488 if (PrintGCDetails) {
3489 // Turn on -verbose:gc options as well
3490 PrintGC = true;
3491 }
3492
3493 if (!JDK_Version::is_gte_jdk18x_version()) {
3494 // To avoid changing the log format for 7 updates this flag is only
3495 // true by default in JDK8 and above.
3496 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3497 FLAG_SET_DEFAULT(PrintGCCause, false);
3498 }
3499 }
3500
3501 // Set object alignment values.
3502 set_object_alignment();
3503
3504 #if !INCLUDE_ALL_GCS
3505 force_serial_gc();
3506 #endif // INCLUDE_ALL_GCS
3507 #if !INCLUDE_CDS
3508 if (DumpSharedSpaces || RequireSharedSpaces) {
3509 jio_fprintf(defaultStream::error_stream(),
3510 "Shared spaces are not supported in this VM\n");
3511 return JNI_ERR;
3512 }
3513 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3514 warning("Shared spaces are not supported in this VM");
3515 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3516 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3517 }
3518 no_shared_spaces();
3519 #endif // INCLUDE_CDS
3520
3521 // Set flags based on ergonomics.
3522 set_ergonomics_flags();
3523
3524 set_shared_spaces_flags();
3525
3526 // Check the GC selections again.
3527 if (!check_gc_consistency()) {
3528 return JNI_EINVAL;
3529 }
3530
3531 if (TieredCompilation) {
3532 set_tiered_flags();
3533 } else {
3534 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3535 if (CompilationPolicyChoice >= 2) {
3536 vm_exit_during_initialization(
3537 "Incompatible compilation policy selected", NULL);
3538 }
3539 }
3540
3541 set_heap_base_min_address();
3542
3543 // Set heap size based on available physical memory
3544 set_heap_size();
3545
3546 #if INCLUDE_ALL_GCS
3547 // Set per-collector flags
3548 if (UseParallelGC || UseParallelOldGC) {
3549 set_parallel_gc_flags();
3550 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3551 set_cms_and_parnew_gc_flags();
3552 } else if (UseParNewGC) { // skipped if CMS is set above
3553 set_parnew_gc_flags();
3554 } else if (UseG1GC) {
3555 set_g1_gc_flags();
3556 }
3557 check_deprecated_gcs();
3558 check_deprecated_gc_flags();
3559 if (AssumeMP && !UseSerialGC) {
3560 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3561 warning("If the number of processors is expected to increase from one, then"
3562 " you should configure the number of parallel GC threads appropriately"
3563 " using -XX:ParallelGCThreads=N");
3564 }
3565 }
3566 #else // INCLUDE_ALL_GCS
3567 assert(verify_serial_gc_flags(), "SerialGC unset");
3568 #endif // INCLUDE_ALL_GCS
3569
3570 // Set bytecode rewriting flags
3571 set_bytecode_flags();
3572
3573 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3574 set_aggressive_opts_flags();
3575
3576 // Turn off biased locking for locking debug mode flags,
3577 // which are subtlely different from each other but neither works with
3578 // biased locking.
3579 if (UseHeavyMonitors
3580 #ifdef COMPILER1
3581 || !UseFastLocking
3582 #endif // COMPILER1
3583 ) {
3584 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3585 // flag set to true on command line; warn the user that they
3586 // can't enable biased locking here
3587 warning("Biased Locking is not supported with locking debug flags"
3588 "; ignoring UseBiasedLocking flag." );
3589 }
3590 UseBiasedLocking = false;
3591 }
3592
3593 #ifdef CC_INTERP
3594 // Clear flags not supported by the C++ interpreter
3595 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3596 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3597 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3598 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false));
3599 #endif // CC_INTERP
3600
3601 #ifdef COMPILER2
3602 if (!UseBiasedLocking || EmitSync != 0) {
3603 UseOptoBiasInlining = false;
3604 }
3605 if (!EliminateLocks) {
3606 EliminateNestedLocks = false;
3607 }
3608 if (!Inline) {
3609 IncrementalInline = false;
3610 }
3611 #ifndef PRODUCT
3612 if (!IncrementalInline) {
3613 AlwaysIncrementalInline = false;
3614 }
3615 #endif
3616 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3617 // incremental inlining: bump MaxNodeLimit
3618 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3619 }
3620 #endif
3621
3622 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3623 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3624 DebugNonSafepoints = true;
3625 }
3626
3627 #ifndef PRODUCT
3628 if (CompileTheWorld) {
3629 // Force NmethodSweeper to sweep whole CodeCache each time.
3630 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3631 NmethodSweepFraction = 1;
3632 }
3633 }
3634 #endif
3635
3636 if (PrintCommandLineFlags) {
3637 CommandLineFlags::printSetFlags(tty);
3638 }
3639
3640 // Apply CPU specific policy for the BiasedLocking
3641 if (UseBiasedLocking) {
3642 if (!VM_Version::use_biased_locking() &&
3643 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3644 UseBiasedLocking = false;
3645 }
3646 }
3647
3648 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3649 // but only if not already set on the commandline
3650 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3651 bool set = false;
3652 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3653 if (!set) {
3654 FLAG_SET_DEFAULT(PauseAtExit, true);
3655 }
3656 }
3657
3658 return JNI_OK;
3659 }
3660
3661 jint Arguments::adjust_after_os() {
3662 #if INCLUDE_ALL_GCS
3663 if (UseParallelGC || UseParallelOldGC) {
3664 if (UseNUMA) {
3665 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3666 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3667 }
3668 // For those collectors or operating systems (eg, Windows) that do
3669 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3670 UseNUMAInterleaving = true;
3671 }
3672 }
3673 #endif // INCLUDE_ALL_GCS
3674 return JNI_OK;
3675 }
3676
3677 int Arguments::PropertyList_count(SystemProperty* pl) {
3678 int count = 0;
3679 while(pl != NULL) {
3680 count++;
3681 pl = pl->next();
3682 }
3683 return count;
3684 }
3685
3686 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3687 assert(key != NULL, "just checking");
3688 SystemProperty* prop;
3689 for (prop = pl; prop != NULL; prop = prop->next()) {
3690 if (strcmp(key, prop->key()) == 0) return prop->value();
3691 }
3692 return NULL;
3693 }
3694
3695 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3696 int count = 0;
3697 const char* ret_val = NULL;
3698
3699 while(pl != NULL) {
3700 if(count >= index) {
3701 ret_val = pl->key();
3702 break;
3703 }
3704 count++;
3705 pl = pl->next();
3706 }
3707
3708 return ret_val;
3709 }
3710
3711 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3712 int count = 0;
3713 char* ret_val = NULL;
3714
3715 while(pl != NULL) {
3716 if(count >= index) {
3717 ret_val = pl->value();
3718 break;
3719 }
3720 count++;
3721 pl = pl->next();
3722 }
3723
3724 return ret_val;
3725 }
3726
3727 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3728 SystemProperty* p = *plist;
3729 if (p == NULL) {
3730 *plist = new_p;
3731 } else {
3732 while (p->next() != NULL) {
3733 p = p->next();
3734 }
3735 p->set_next(new_p);
3736 }
3737 }
3738
3739 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3740 if (plist == NULL)
3741 return;
3742
3743 SystemProperty* new_p = new SystemProperty(k, v, true);
3744 PropertyList_add(plist, new_p);
3745 }
3746
3747 // This add maintains unique property key in the list.
3748 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3749 if (plist == NULL)
3750 return;
3751
3752 // If property key exist then update with new value.
3753 SystemProperty* prop;
3754 for (prop = *plist; prop != NULL; prop = prop->next()) {
3755 if (strcmp(k, prop->key()) == 0) {
3756 if (append) {
3757 prop->append_value(v);
3758 } else {
3759 prop->set_value(v);
3760 }
3761 return;
3762 }
3763 }
3764
3765 PropertyList_add(plist, k, v);
3766 }
3767
3768 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3769 // Returns true if all of the source pointed by src has been copied over to
3770 // the destination buffer pointed by buf. Otherwise, returns false.
3771 // Notes:
3772 // 1. If the length (buflen) of the destination buffer excluding the
3773 // NULL terminator character is not long enough for holding the expanded
3774 // pid characters, it also returns false instead of returning the partially
3775 // expanded one.
3776 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3777 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3778 char* buf, size_t buflen) {
3779 const char* p = src;
3780 char* b = buf;
3781 const char* src_end = &src[srclen];
3782 char* buf_end = &buf[buflen - 1];
3783
3784 while (p < src_end && b < buf_end) {
3785 if (*p == '%') {
3786 switch (*(++p)) {
3787 case '%': // "%%" ==> "%"
3788 *b++ = *p++;
3789 break;
3790 case 'p': { // "%p" ==> current process id
3791 // buf_end points to the character before the last character so
3792 // that we could write '\0' to the end of the buffer.
3793 size_t buf_sz = buf_end - b + 1;
3794 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3795
3796 // if jio_snprintf fails or the buffer is not long enough to hold
3797 // the expanded pid, returns false.
3798 if (ret < 0 || ret >= (int)buf_sz) {
3799 return false;
3800 } else {
3801 b += ret;
3802 assert(*b == '\0', "fail in copy_expand_pid");
3803 if (p == src_end && b == buf_end + 1) {
3804 // reach the end of the buffer.
3805 return true;
3806 }
3807 }
3808 p++;
3809 break;
3810 }
3811 default :
3812 *b++ = '%';
3813 }
3814 } else {
3815 *b++ = *p++;
3816 }
3817 }
3818 *b = '\0';
3819 return (p == src_end); // return false if not all of the source was copied
3820 }