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