1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaAssertions.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "compiler/compilerOracle.hpp"
29 #include "memory/allocation.inline.hpp"
30 #include "memory/cardTableRS.hpp"
31 #include "memory/referenceProcessor.hpp"
32 #include "memory/universe.inline.hpp"
33 #include "oops/oop.inline.hpp"
34 #include "prims/jvmtiExport.hpp"
35 #include "runtime/arguments.hpp"
36 #include "runtime/globals_extension.hpp"
37 #include "runtime/java.hpp"
38 #include "services/management.hpp"
39 #include "services/memTracker.hpp"
40 #include "utilities/defaultStream.hpp"
41 #include "utilities/macros.hpp"
42 #include "utilities/taskqueue.hpp"
43 #ifdef TARGET_OS_FAMILY_linux
44 # include "os_linux.inline.hpp"
45 #endif
46 #ifdef TARGET_OS_FAMILY_solaris
47 # include "os_solaris.inline.hpp"
48 #endif
49 #ifdef TARGET_OS_FAMILY_windows
50 # include "os_windows.inline.hpp"
51 #endif
52 #ifdef TARGET_OS_FAMILY_bsd
53 # include "os_bsd.inline.hpp"
54 #endif
55 #if INCLUDE_ALL_GCS
56 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
57 #endif // INCLUDE_ALL_GCS
58
59 // Note: This is a special bug reporting site for the JVM
60 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
61 #define DEFAULT_JAVA_LAUNCHER "generic"
62
63 char** Arguments::_jvm_flags_array = NULL;
64 int Arguments::_num_jvm_flags = 0;
65 char** Arguments::_jvm_args_array = NULL;
66 int Arguments::_num_jvm_args = 0;
67 char* Arguments::_java_command = NULL;
68 SystemProperty* Arguments::_system_properties = NULL;
69 const char* Arguments::_gc_log_filename = NULL;
70 bool Arguments::_has_profile = false;
71 uintx Arguments::_min_heap_size = 0;
72 Arguments::Mode Arguments::_mode = _mixed;
73 bool Arguments::_java_compiler = false;
74 bool Arguments::_xdebug_mode = false;
75 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
76 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
77 int Arguments::_sun_java_launcher_pid = -1;
78 bool Arguments::_created_by_gamma_launcher = false;
79
80 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
81 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
82 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
83 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
84 bool Arguments::_ClipInlining = ClipInlining;
85
86 char* Arguments::SharedArchivePath = NULL;
87
88 AgentLibraryList Arguments::_libraryList;
89 AgentLibraryList Arguments::_agentList;
90
91 abort_hook_t Arguments::_abort_hook = NULL;
92 exit_hook_t Arguments::_exit_hook = NULL;
93 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
94
95
96 SystemProperty *Arguments::_java_ext_dirs = NULL;
97 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
98 SystemProperty *Arguments::_sun_boot_library_path = NULL;
99 SystemProperty *Arguments::_java_library_path = NULL;
100 SystemProperty *Arguments::_java_home = NULL;
101 SystemProperty *Arguments::_java_class_path = NULL;
102 SystemProperty *Arguments::_sun_boot_class_path = NULL;
103
104 char* Arguments::_meta_index_path = NULL;
105 char* Arguments::_meta_index_dir = NULL;
106
107 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
108
109 static bool match_option(const JavaVMOption *option, const char* name,
110 const char** tail) {
111 int len = (int)strlen(name);
112 if (strncmp(option->optionString, name, len) == 0) {
113 *tail = option->optionString + len;
114 return true;
115 } else {
116 return false;
117 }
118 }
119
120 static void logOption(const char* opt) {
121 if (PrintVMOptions) {
122 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
123 }
124 }
125
126 // Process java launcher properties.
127 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
128 // See if sun.java.launcher or sun.java.launcher.pid is defined.
129 // Must do this before setting up other system properties,
130 // as some of them may depend on launcher type.
131 for (int index = 0; index < args->nOptions; index++) {
132 const JavaVMOption* option = args->options + index;
133 const char* tail;
134
135 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
136 process_java_launcher_argument(tail, option->extraInfo);
137 continue;
138 }
139 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
140 _sun_java_launcher_pid = atoi(tail);
141 continue;
142 }
143 }
144 }
145
146 // Initialize system properties key and value.
147 void Arguments::init_system_properties() {
148
149 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
150 "Java Virtual Machine Specification", false));
151 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
153 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
154
155 // following are JVMTI agent writeable properties.
156 // Properties values are set to NULL and they are
157 // os specific they are initialized in os::init_system_properties_values().
158 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
159 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
160 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
161 _java_library_path = new SystemProperty("java.library.path", NULL, true);
162 _java_home = new SystemProperty("java.home", NULL, true);
163 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
164
165 _java_class_path = new SystemProperty("java.class.path", "", true);
166
167 // Add to System Property list.
168 PropertyList_add(&_system_properties, _java_ext_dirs);
169 PropertyList_add(&_system_properties, _java_endorsed_dirs);
170 PropertyList_add(&_system_properties, _sun_boot_library_path);
171 PropertyList_add(&_system_properties, _java_library_path);
172 PropertyList_add(&_system_properties, _java_home);
173 PropertyList_add(&_system_properties, _java_class_path);
174 PropertyList_add(&_system_properties, _sun_boot_class_path);
175
176 // Set OS specific system properties values
177 os::init_system_properties_values();
178 }
179
180
181 // Update/Initialize System properties after JDK version number is known
182 void Arguments::init_version_specific_system_properties() {
183 enum { bufsz = 16 };
184 char buffer[bufsz];
185 const char* spec_vendor = "Sun Microsystems Inc.";
186 uint32_t spec_version = 0;
187
188 if (JDK_Version::is_gte_jdk17x_version()) {
189 spec_vendor = "Oracle Corporation";
190 spec_version = JDK_Version::current().major_version();
191 }
192 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
193
194 PropertyList_add(&_system_properties,
195 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
196 PropertyList_add(&_system_properties,
197 new SystemProperty("java.vm.specification.version", buffer, false));
198 PropertyList_add(&_system_properties,
199 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
200 }
201
202 /**
203 * Provide a slightly more user-friendly way of eliminating -XX flags.
204 * When a flag is eliminated, it can be added to this list in order to
205 * continue accepting this flag on the command-line, while issuing a warning
206 * and ignoring the value. Once the JDK version reaches the 'accept_until'
207 * limit, we flatly refuse to admit the existence of the flag. This allows
208 * a flag to die correctly over JDK releases using HSX.
209 */
210 typedef struct {
211 const char* name;
212 JDK_Version obsoleted_in; // when the flag went away
213 JDK_Version accept_until; // which version to start denying the existence
214 } ObsoleteFlag;
215
216 static ObsoleteFlag obsolete_jvm_flags[] = {
217 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
218 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
219 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
220 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
221 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
222 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
223 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
229 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
230 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
231 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
232 { "DefaultInitialRAMFraction",
233 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
234 { "UseDepthFirstScavengeOrder",
235 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
236 { "HandlePromotionFailure",
237 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
238 { "MaxLiveObjectEvacuationRatio",
239 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
240 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
241 { "UseParallelOldGCCompacting",
242 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
243 { "UseParallelDensePrefixUpdate",
244 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
245 { "UseParallelOldGCDensePrefix",
246 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
247 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
248 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
249 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
250 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
251 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
252 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
253 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
254 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
255 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
256 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
257 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
258 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
259 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
260 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
261 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
262 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
263 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
264 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
265 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
266 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
267 #ifdef PRODUCT
268 { "DesiredMethodLimit",
269 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
270 #endif // PRODUCT
271 { NULL, JDK_Version(0), JDK_Version(0) }
272 };
273
274 // Returns true if the flag is obsolete and fits into the range specified
275 // for being ignored. In the case that the flag is ignored, the 'version'
276 // value is filled in with the version number when the flag became
277 // obsolete so that that value can be displayed to the user.
278 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
279 int i = 0;
280 assert(version != NULL, "Must provide a version buffer");
281 while (obsolete_jvm_flags[i].name != NULL) {
282 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
283 // <flag>=xxx form
284 // [-|+]<flag> form
285 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
286 ((s[0] == '+' || s[0] == '-') &&
287 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
288 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
289 *version = flag_status.obsoleted_in;
290 return true;
291 }
292 }
293 i++;
294 }
295 return false;
296 }
297
298 // Constructs the system class path (aka boot class path) from the following
299 // components, in order:
300 //
301 // prefix // from -Xbootclasspath/p:...
302 // endorsed // the expansion of -Djava.endorsed.dirs=...
303 // base // from os::get_system_properties() or -Xbootclasspath=
304 // suffix // from -Xbootclasspath/a:...
305 //
306 // java.endorsed.dirs is a list of directories; any jar or zip files in the
307 // directories are added to the sysclasspath just before the base.
308 //
309 // This could be AllStatic, but it isn't needed after argument processing is
310 // complete.
311 class SysClassPath: public StackObj {
312 public:
313 SysClassPath(const char* base);
314 ~SysClassPath();
315
316 inline void set_base(const char* base);
317 inline void add_prefix(const char* prefix);
318 inline void add_suffix_to_prefix(const char* suffix);
319 inline void add_suffix(const char* suffix);
320 inline void reset_path(const char* base);
321
322 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
323 // property. Must be called after all command-line arguments have been
324 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
325 // combined_path().
326 void expand_endorsed();
327
328 inline const char* get_base() const { return _items[_scp_base]; }
329 inline const char* get_prefix() const { return _items[_scp_prefix]; }
330 inline const char* get_suffix() const { return _items[_scp_suffix]; }
331 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
332
333 // Combine all the components into a single c-heap-allocated string; caller
334 // must free the string if/when no longer needed.
335 char* combined_path();
336
337 private:
338 // Utility routines.
339 static char* add_to_path(const char* path, const char* str, bool prepend);
340 static char* add_jars_to_path(char* path, const char* directory);
341
342 inline void reset_item_at(int index);
343
344 // Array indices for the items that make up the sysclasspath. All except the
345 // base are allocated in the C heap and freed by this class.
346 enum {
347 _scp_prefix, // from -Xbootclasspath/p:...
348 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
349 _scp_base, // the default sysclasspath
350 _scp_suffix, // from -Xbootclasspath/a:...
351 _scp_nitems // the number of items, must be last.
352 };
353
354 const char* _items[_scp_nitems];
355 DEBUG_ONLY(bool _expansion_done;)
356 };
357
358 SysClassPath::SysClassPath(const char* base) {
359 memset(_items, 0, sizeof(_items));
360 _items[_scp_base] = base;
361 DEBUG_ONLY(_expansion_done = false;)
362 }
363
364 SysClassPath::~SysClassPath() {
365 // Free everything except the base.
366 for (int i = 0; i < _scp_nitems; ++i) {
367 if (i != _scp_base) reset_item_at(i);
368 }
369 DEBUG_ONLY(_expansion_done = false;)
370 }
371
372 inline void SysClassPath::set_base(const char* base) {
373 _items[_scp_base] = base;
374 }
375
376 inline void SysClassPath::add_prefix(const char* prefix) {
377 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
378 }
379
380 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
381 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
382 }
383
384 inline void SysClassPath::add_suffix(const char* suffix) {
385 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
386 }
387
388 inline void SysClassPath::reset_item_at(int index) {
389 assert(index < _scp_nitems && index != _scp_base, "just checking");
390 if (_items[index] != NULL) {
391 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
392 _items[index] = NULL;
393 }
394 }
395
396 inline void SysClassPath::reset_path(const char* base) {
397 // Clear the prefix and suffix.
398 reset_item_at(_scp_prefix);
399 reset_item_at(_scp_suffix);
400 set_base(base);
401 }
402
403 //------------------------------------------------------------------------------
404
405 void SysClassPath::expand_endorsed() {
406 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
407
408 const char* path = Arguments::get_property("java.endorsed.dirs");
409 if (path == NULL) {
410 path = Arguments::get_endorsed_dir();
411 assert(path != NULL, "no default for java.endorsed.dirs");
412 }
413
414 char* expanded_path = NULL;
415 const char separator = *os::path_separator();
416 const char* const end = path + strlen(path);
417 while (path < end) {
418 const char* tmp_end = strchr(path, separator);
419 if (tmp_end == NULL) {
420 expanded_path = add_jars_to_path(expanded_path, path);
421 path = end;
422 } else {
423 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
424 memcpy(dirpath, path, tmp_end - path);
425 dirpath[tmp_end - path] = '\0';
426 expanded_path = add_jars_to_path(expanded_path, dirpath);
427 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
428 path = tmp_end + 1;
429 }
430 }
431 _items[_scp_endorsed] = expanded_path;
432 DEBUG_ONLY(_expansion_done = true;)
433 }
434
435 // Combine the bootclasspath elements, some of which may be null, into a single
436 // c-heap-allocated string.
437 char* SysClassPath::combined_path() {
438 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
439 assert(_expansion_done, "must call expand_endorsed() first.");
440
441 size_t lengths[_scp_nitems];
442 size_t total_len = 0;
443
444 const char separator = *os::path_separator();
445
446 // Get the lengths.
447 int i;
448 for (i = 0; i < _scp_nitems; ++i) {
449 if (_items[i] != NULL) {
450 lengths[i] = strlen(_items[i]);
451 // Include space for the separator char (or a NULL for the last item).
452 total_len += lengths[i] + 1;
453 }
454 }
455 assert(total_len > 0, "empty sysclasspath not allowed");
456
457 // Copy the _items to a single string.
458 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
459 char* cp_tmp = cp;
460 for (i = 0; i < _scp_nitems; ++i) {
461 if (_items[i] != NULL) {
462 memcpy(cp_tmp, _items[i], lengths[i]);
463 cp_tmp += lengths[i];
464 *cp_tmp++ = separator;
465 }
466 }
467 *--cp_tmp = '\0'; // Replace the extra separator.
468 return cp;
469 }
470
471 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
472 char*
473 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
474 char *cp;
475
476 assert(str != NULL, "just checking");
477 if (path == NULL) {
478 size_t len = strlen(str) + 1;
479 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
480 memcpy(cp, str, len); // copy the trailing null
481 } else {
482 const char separator = *os::path_separator();
483 size_t old_len = strlen(path);
484 size_t str_len = strlen(str);
485 size_t len = old_len + str_len + 2;
486
487 if (prepend) {
488 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
489 char* cp_tmp = cp;
490 memcpy(cp_tmp, str, str_len);
491 cp_tmp += str_len;
492 *cp_tmp = separator;
493 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
494 FREE_C_HEAP_ARRAY(char, path, mtInternal);
495 } else {
496 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
497 char* cp_tmp = cp + old_len;
498 *cp_tmp = separator;
499 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
500 }
501 }
502 return cp;
503 }
504
505 // Scan the directory and append any jar or zip files found to path.
506 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
507 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
508 DIR* dir = os::opendir(directory);
509 if (dir == NULL) return path;
510
511 char dir_sep[2] = { '\0', '\0' };
512 size_t directory_len = strlen(directory);
513 const char fileSep = *os::file_separator();
514 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
515
516 /* Scan the directory for jars/zips, appending them to path. */
517 struct dirent *entry;
518 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
519 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
520 const char* name = entry->d_name;
521 const char* ext = name + strlen(name) - 4;
522 bool isJarOrZip = ext > name &&
523 (os::file_name_strcmp(ext, ".jar") == 0 ||
524 os::file_name_strcmp(ext, ".zip") == 0);
525 if (isJarOrZip) {
526 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
527 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
528 path = add_to_path(path, jarpath, false);
529 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
530 }
531 }
532 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
533 os::closedir(dir);
534 return path;
535 }
536
537 // Parses a memory size specification string.
538 static bool atomull(const char *s, julong* result) {
539 julong n = 0;
540 int args_read = sscanf(s, JULONG_FORMAT, &n);
541 if (args_read != 1) {
542 return false;
543 }
544 while (*s != '\0' && isdigit(*s)) {
545 s++;
546 }
547 // 4705540: illegal if more characters are found after the first non-digit
548 if (strlen(s) > 1) {
549 return false;
550 }
551 switch (*s) {
552 case 'T': case 't':
553 *result = n * G * K;
554 // Check for overflow.
555 if (*result/((julong)G * K) != n) return false;
556 return true;
557 case 'G': case 'g':
558 *result = n * G;
559 if (*result/G != n) return false;
560 return true;
561 case 'M': case 'm':
562 *result = n * M;
563 if (*result/M != n) return false;
564 return true;
565 case 'K': case 'k':
566 *result = n * K;
567 if (*result/K != n) return false;
568 return true;
569 case '\0':
570 *result = n;
571 return true;
572 default:
573 return false;
574 }
575 }
576
577 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
578 if (size < min_size) return arg_too_small;
579 // Check that size will fit in a size_t (only relevant on 32-bit)
580 if (size > max_uintx) return arg_too_big;
581 return arg_in_range;
582 }
583
584 // Describe an argument out of range error
585 void Arguments::describe_range_error(ArgsRange errcode) {
586 switch(errcode) {
587 case arg_too_big:
588 jio_fprintf(defaultStream::error_stream(),
589 "The specified size exceeds the maximum "
590 "representable size.\n");
591 break;
592 case arg_too_small:
593 case arg_unreadable:
594 case arg_in_range:
595 // do nothing for now
596 break;
597 default:
598 ShouldNotReachHere();
599 }
600 }
601
602 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
603 return CommandLineFlags::boolAtPut(name, &value, origin);
604 }
605
606 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
607 double v;
608 if (sscanf(value, "%lf", &v) != 1) {
609 return false;
610 }
611
612 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
613 return true;
614 }
615 return false;
616 }
617
618 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
619 julong v;
620 intx intx_v;
621 bool is_neg = false;
622 // Check the sign first since atomull() parses only unsigned values.
623 if (*value == '-') {
624 if (!CommandLineFlags::intxAt(name, &intx_v)) {
625 return false;
626 }
627 value++;
628 is_neg = true;
629 }
630 if (!atomull(value, &v)) {
631 return false;
632 }
633 intx_v = (intx) v;
634 if (is_neg) {
635 intx_v = -intx_v;
636 }
637 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
638 return true;
639 }
640 uintx uintx_v = (uintx) v;
641 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
642 return true;
643 }
644 uint64_t uint64_t_v = (uint64_t) v;
645 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
646 return true;
647 }
648 return false;
649 }
650
651 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
652 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
653 // Contract: CommandLineFlags always returns a pointer that needs freeing.
654 FREE_C_HEAP_ARRAY(char, value, mtInternal);
655 return true;
656 }
657
658 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
659 const char* old_value = "";
660 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
661 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
662 size_t new_len = strlen(new_value);
663 const char* value;
664 char* free_this_too = NULL;
665 if (old_len == 0) {
666 value = new_value;
667 } else if (new_len == 0) {
668 value = old_value;
669 } else {
670 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
671 // each new setting adds another LINE to the switch:
672 sprintf(buf, "%s\n%s", old_value, new_value);
673 value = buf;
674 free_this_too = buf;
675 }
676 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
677 // CommandLineFlags always returns a pointer that needs freeing.
678 FREE_C_HEAP_ARRAY(char, value, mtInternal);
679 if (free_this_too != NULL) {
680 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
681 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
682 }
683 return true;
684 }
685
686 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
687
688 // range of acceptable characters spelled out for portability reasons
689 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
690 #define BUFLEN 255
691 char name[BUFLEN+1];
692 char dummy;
693
694 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
695 return set_bool_flag(name, false, origin);
696 }
697 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
698 return set_bool_flag(name, true, origin);
699 }
700
701 char punct;
702 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
703 const char* value = strchr(arg, '=') + 1;
704 Flag* flag = Flag::find_flag(name, strlen(name));
705 if (flag != NULL && flag->is_ccstr()) {
706 if (flag->ccstr_accumulates()) {
707 return append_to_string_flag(name, value, origin);
708 } else {
709 if (value[0] == '\0') {
710 value = NULL;
711 }
712 return set_string_flag(name, value, origin);
713 }
714 }
715 }
716
717 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
718 const char* value = strchr(arg, '=') + 1;
719 // -XX:Foo:=xxx will reset the string flag to the given value.
720 if (value[0] == '\0') {
721 value = NULL;
722 }
723 return set_string_flag(name, value, origin);
724 }
725
726 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
727 #define SIGNED_NUMBER_RANGE "[-0123456789]"
728 #define NUMBER_RANGE "[0123456789]"
729 char value[BUFLEN + 1];
730 char value2[BUFLEN + 1];
731 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
732 // Looks like a floating-point number -- try again with more lenient format string
733 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
734 return set_fp_numeric_flag(name, value, origin);
735 }
736 }
737
738 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
739 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
740 return set_numeric_flag(name, value, origin);
741 }
742
743 return false;
744 }
745
746 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
747 assert(bldarray != NULL, "illegal argument");
748
749 if (arg == NULL) {
750 return;
751 }
752
753 int new_count = *count + 1;
754
755 // expand the array and add arg to the last element
756 if (*bldarray == NULL) {
757 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
758 } else {
759 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
760 }
761 (*bldarray)[*count] = strdup(arg);
762 *count = new_count;
763 }
764
765 void Arguments::build_jvm_args(const char* arg) {
766 add_string(&_jvm_args_array, &_num_jvm_args, arg);
767 }
768
769 void Arguments::build_jvm_flags(const char* arg) {
770 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
771 }
772
773 // utility function to return a string that concatenates all
774 // strings in a given char** array
775 const char* Arguments::build_resource_string(char** args, int count) {
776 if (args == NULL || count == 0) {
777 return NULL;
778 }
779 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
780 for (int i = 1; i < count; i++) {
781 length += strlen(args[i]) + 1; // add 1 for a space
782 }
783 char* s = NEW_RESOURCE_ARRAY(char, length);
784 strcpy(s, args[0]);
785 for (int j = 1; j < count; j++) {
786 strcat(s, " ");
787 strcat(s, args[j]);
788 }
789 return (const char*) s;
790 }
791
792 void Arguments::print_on(outputStream* st) {
793 st->print_cr("VM Arguments:");
794 if (num_jvm_flags() > 0) {
795 st->print("jvm_flags: "); print_jvm_flags_on(st);
796 }
797 if (num_jvm_args() > 0) {
798 st->print("jvm_args: "); print_jvm_args_on(st);
799 }
800 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
801 if (_java_class_path != NULL) {
802 char* path = _java_class_path->value();
803 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
804 }
805 st->print_cr("Launcher Type: %s", _sun_java_launcher);
806 }
807
808 void Arguments::print_jvm_flags_on(outputStream* st) {
809 if (_num_jvm_flags > 0) {
810 for (int i=0; i < _num_jvm_flags; i++) {
811 st->print("%s ", _jvm_flags_array[i]);
812 }
813 st->print_cr("");
814 }
815 }
816
817 void Arguments::print_jvm_args_on(outputStream* st) {
818 if (_num_jvm_args > 0) {
819 for (int i=0; i < _num_jvm_args; i++) {
820 st->print("%s ", _jvm_args_array[i]);
821 }
822 st->print_cr("");
823 }
824 }
825
826 bool Arguments::process_argument(const char* arg,
827 jboolean ignore_unrecognized, FlagValueOrigin origin) {
828
829 JDK_Version since = JDK_Version();
830
831 if (parse_argument(arg, origin) || ignore_unrecognized) {
832 return true;
833 }
834
835 bool has_plus_minus = (*arg == '+' || *arg == '-');
836 const char* const argname = has_plus_minus ? arg + 1 : arg;
837 if (is_newly_obsolete(arg, &since)) {
838 char version[256];
839 since.to_string(version, sizeof(version));
840 warning("ignoring option %s; support was removed in %s", argname, version);
841 return true;
842 }
843
844 // For locked flags, report a custom error message if available.
845 // Otherwise, report the standard unrecognized VM option.
846
847 size_t arg_len;
848 const char* equal_sign = strchr(argname, '=');
849 if (equal_sign == NULL) {
850 arg_len = strlen(argname);
851 } else {
852 arg_len = equal_sign - argname;
853 }
854
855 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true);
856 if (found_flag != NULL) {
857 char locked_message_buf[BUFLEN];
858 found_flag->get_locked_message(locked_message_buf, BUFLEN);
859 if (strlen(locked_message_buf) == 0) {
860 if (found_flag->is_bool() && !has_plus_minus) {
861 jio_fprintf(defaultStream::error_stream(),
862 "Missing +/- setting for VM option '%s'\n", argname);
863 } else if (!found_flag->is_bool() && has_plus_minus) {
864 jio_fprintf(defaultStream::error_stream(),
865 "Unexpected +/- setting in VM option '%s'\n", argname);
866 } else {
867 jio_fprintf(defaultStream::error_stream(),
868 "Improperly specified VM option '%s'\n", argname);
869 }
870 } else {
871 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
872 }
873 } else {
874 jio_fprintf(defaultStream::error_stream(),
875 "Unrecognized VM option '%s'\n", argname);
876 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
877 if (fuzzy_matched != NULL) {
878 jio_fprintf(defaultStream::error_stream(),
879 "Did you mean '%s%s%s'?\n",
880 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
881 fuzzy_matched->name,
882 (fuzzy_matched->is_bool()) ? "" : "=<value>");
883 }
884 }
885
886 // allow for commandline "commenting out" options like -XX:#+Verbose
887 return arg[0] == '#';
888 }
889
890 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
891 FILE* stream = fopen(file_name, "rb");
892 if (stream == NULL) {
893 if (should_exist) {
894 jio_fprintf(defaultStream::error_stream(),
895 "Could not open settings file %s\n", file_name);
896 return false;
897 } else {
898 return true;
899 }
900 }
901
902 char token[1024];
903 int pos = 0;
904
905 bool in_white_space = true;
906 bool in_comment = false;
907 bool in_quote = false;
908 char quote_c = 0;
909 bool result = true;
910
911 int c = getc(stream);
912 while(c != EOF && pos < (int)(sizeof(token)-1)) {
913 if (in_white_space) {
914 if (in_comment) {
915 if (c == '\n') in_comment = false;
916 } else {
917 if (c == '#') in_comment = true;
918 else if (!isspace(c)) {
919 in_white_space = false;
920 token[pos++] = c;
921 }
922 }
923 } else {
924 if (c == '\n' || (!in_quote && isspace(c))) {
925 // token ends at newline, or at unquoted whitespace
926 // this allows a way to include spaces in string-valued options
927 token[pos] = '\0';
928 logOption(token);
929 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
930 build_jvm_flags(token);
931 pos = 0;
932 in_white_space = true;
933 in_quote = false;
934 } else if (!in_quote && (c == '\'' || c == '"')) {
935 in_quote = true;
936 quote_c = c;
937 } else if (in_quote && (c == quote_c)) {
938 in_quote = false;
939 } else {
940 token[pos++] = c;
941 }
942 }
943 c = getc(stream);
944 }
945 if (pos > 0) {
946 token[pos] = '\0';
947 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
948 build_jvm_flags(token);
949 }
950 fclose(stream);
951 return result;
952 }
953
954 //=============================================================================================================
955 // Parsing of properties (-D)
956
957 const char* Arguments::get_property(const char* key) {
958 return PropertyList_get_value(system_properties(), key);
959 }
960
961 bool Arguments::add_property(const char* prop) {
962 const char* eq = strchr(prop, '=');
963 char* key;
964 // ns must be static--its address may be stored in a SystemProperty object.
965 const static char ns[1] = {0};
966 char* value = (char *)ns;
967
968 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
969 key = AllocateHeap(key_len + 1, mtInternal);
970 strncpy(key, prop, key_len);
971 key[key_len] = '\0';
972
973 if (eq != NULL) {
974 size_t value_len = strlen(prop) - key_len - 1;
975 value = AllocateHeap(value_len + 1, mtInternal);
976 strncpy(value, &prop[key_len + 1], value_len + 1);
977 }
978
979 if (strcmp(key, "java.compiler") == 0) {
980 process_java_compiler_argument(value);
981 FreeHeap(key);
982 if (eq != NULL) {
983 FreeHeap(value);
984 }
985 return true;
986 } else if (strcmp(key, "sun.java.command") == 0) {
987 _java_command = value;
988
989 // Record value in Arguments, but let it get passed to Java.
990 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
991 // launcher.pid property is private and is processed
992 // in process_sun_java_launcher_properties();
993 // the sun.java.launcher property is passed on to the java application
994 FreeHeap(key);
995 if (eq != NULL) {
996 FreeHeap(value);
997 }
998 return true;
999 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1000 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1001 // its value without going through the property list or making a Java call.
1002 _java_vendor_url_bug = value;
1003 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1004 PropertyList_unique_add(&_system_properties, key, value, true);
1005 return true;
1006 }
1007 // Create new property and add at the end of the list
1008 PropertyList_unique_add(&_system_properties, key, value);
1009 return true;
1010 }
1011
1012 //===========================================================================================================
1013 // Setting int/mixed/comp mode flags
1014
1015 void Arguments::set_mode_flags(Mode mode) {
1016 // Set up default values for all flags.
1017 // If you add a flag to any of the branches below,
1018 // add a default value for it here.
1019 set_java_compiler(false);
1020 _mode = mode;
1021
1022 // Ensure Agent_OnLoad has the correct initial values.
1023 // This may not be the final mode; mode may change later in onload phase.
1024 PropertyList_unique_add(&_system_properties, "java.vm.info",
1025 (char*)VM_Version::vm_info_string(), false);
1026
1027 UseInterpreter = true;
1028 UseCompiler = true;
1029 UseLoopCounter = true;
1030
1031 #ifndef ZERO
1032 // Turn these off for mixed and comp. Leave them on for Zero.
1033 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1034 UseFastAccessorMethods = (mode == _int);
1035 }
1036 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1037 UseFastEmptyMethods = (mode == _int);
1038 }
1039 #endif
1040
1041 // Default values may be platform/compiler dependent -
1042 // use the saved values
1043 ClipInlining = Arguments::_ClipInlining;
1044 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1045 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1046 BackgroundCompilation = Arguments::_BackgroundCompilation;
1047
1048 // Change from defaults based on mode
1049 switch (mode) {
1050 default:
1051 ShouldNotReachHere();
1052 break;
1053 case _int:
1054 UseCompiler = false;
1055 UseLoopCounter = false;
1056 AlwaysCompileLoopMethods = false;
1057 UseOnStackReplacement = false;
1058 break;
1059 case _mixed:
1060 // same as default
1061 break;
1062 case _comp:
1063 UseInterpreter = false;
1064 BackgroundCompilation = false;
1065 ClipInlining = false;
1066 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1067 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1068 // compile a level 4 (C2) and then continue executing it.
1069 if (TieredCompilation) {
1070 Tier3InvokeNotifyFreqLog = 0;
1071 Tier4InvocationThreshold = 0;
1072 }
1073 break;
1074 }
1075 }
1076
1077 // Conflict: required to use shared spaces (-Xshare:on), but
1078 // incompatible command line options were chosen.
1079
1080 static void no_shared_spaces() {
1081 if (RequireSharedSpaces) {
1082 jio_fprintf(defaultStream::error_stream(),
1083 "Class data sharing is inconsistent with other specified options.\n");
1084 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1085 } else {
1086 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1087 }
1088 }
1089
1090 void Arguments::set_tiered_flags() {
1091 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1092 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1093 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1094 }
1095 if (CompilationPolicyChoice < 2) {
1096 vm_exit_during_initialization(
1097 "Incompatible compilation policy selected", NULL);
1098 }
1099 // Increase the code cache size - tiered compiles a lot more.
1100 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1101 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1102 }
1103 if (!UseInterpreter) { // -Xcomp
1104 Tier3InvokeNotifyFreqLog = 0;
1105 Tier4InvocationThreshold = 0;
1106 }
1107 }
1108
1109 #if INCLUDE_ALL_GCS
1110 static void disable_adaptive_size_policy(const char* collector_name) {
1111 if (UseAdaptiveSizePolicy) {
1112 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1113 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1114 collector_name);
1115 }
1116 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1117 }
1118 }
1119
1120 void Arguments::set_parnew_gc_flags() {
1121 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1122 "control point invariant");
1123 assert(UseParNewGC, "Error");
1124
1125 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1126 disable_adaptive_size_policy("UseParNewGC");
1127
1128 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1129 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1130 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1131 } else if (ParallelGCThreads == 0) {
1132 jio_fprintf(defaultStream::error_stream(),
1133 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1134 vm_exit(1);
1135 }
1136
1137 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1138 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1139 // we set them to 1024 and 1024.
1140 // See CR 6362902.
1141 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1142 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1143 }
1144 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1145 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1146 }
1147
1148 // AlwaysTenure flag should make ParNew promote all at first collection.
1149 // See CR 6362902.
1150 if (AlwaysTenure) {
1151 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1152 }
1153 // When using compressed oops, we use local overflow stacks,
1154 // rather than using a global overflow list chained through
1155 // the klass word of the object's pre-image.
1156 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1157 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1158 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1159 }
1160 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1161 }
1162 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1163 }
1164
1165 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1166 // sparc/solaris for certain applications, but would gain from
1167 // further optimization and tuning efforts, and would almost
1168 // certainly gain from analysis of platform and environment.
1169 void Arguments::set_cms_and_parnew_gc_flags() {
1170 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1171 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1172
1173 // If we are using CMS, we prefer to UseParNewGC,
1174 // unless explicitly forbidden.
1175 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1176 FLAG_SET_ERGO(bool, UseParNewGC, true);
1177 }
1178
1179 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1180 disable_adaptive_size_policy("UseConcMarkSweepGC");
1181
1182 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1183 // as needed.
1184 if (UseParNewGC) {
1185 set_parnew_gc_flags();
1186 }
1187
1188 size_t max_heap = align_size_down(MaxHeapSize,
1189 CardTableRS::ct_max_alignment_constraint());
1190
1191 // Now make adjustments for CMS
1192 intx tenuring_default = (intx)6;
1193 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1194
1195 // Preferred young gen size for "short" pauses:
1196 // upper bound depends on # of threads and NewRatio.
1197 const uintx parallel_gc_threads =
1198 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1199 const size_t preferred_max_new_size_unaligned =
1200 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1201 size_t preferred_max_new_size =
1202 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1203
1204 // Unless explicitly requested otherwise, size young gen
1205 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1206
1207 // If either MaxNewSize or NewRatio is set on the command line,
1208 // assume the user is trying to set the size of the young gen.
1209 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1210
1211 // Set MaxNewSize to our calculated preferred_max_new_size unless
1212 // NewSize was set on the command line and it is larger than
1213 // preferred_max_new_size.
1214 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1215 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1216 } else {
1217 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1218 }
1219 if (PrintGCDetails && Verbose) {
1220 // Too early to use gclog_or_tty
1221 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1222 }
1223
1224 // Code along this path potentially sets NewSize and OldSize
1225 if (PrintGCDetails && Verbose) {
1226 // Too early to use gclog_or_tty
1227 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1228 " initial_heap_size: " SIZE_FORMAT
1229 " max_heap: " SIZE_FORMAT,
1230 min_heap_size(), InitialHeapSize, max_heap);
1231 }
1232 size_t min_new = preferred_max_new_size;
1233 if (FLAG_IS_CMDLINE(NewSize)) {
1234 min_new = NewSize;
1235 }
1236 if (max_heap > min_new && min_heap_size() > min_new) {
1237 // Unless explicitly requested otherwise, make young gen
1238 // at least min_new, and at most preferred_max_new_size.
1239 if (FLAG_IS_DEFAULT(NewSize)) {
1240 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1241 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1242 if (PrintGCDetails && Verbose) {
1243 // Too early to use gclog_or_tty
1244 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1245 }
1246 }
1247 // Unless explicitly requested otherwise, size old gen
1248 // so it's NewRatio x of NewSize.
1249 if (FLAG_IS_DEFAULT(OldSize)) {
1250 if (max_heap > NewSize) {
1251 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1252 if (PrintGCDetails && Verbose) {
1253 // Too early to use gclog_or_tty
1254 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1255 }
1256 }
1257 }
1258 }
1259 }
1260 // Unless explicitly requested otherwise, definitely
1261 // promote all objects surviving "tenuring_default" scavenges.
1262 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1263 FLAG_IS_DEFAULT(SurvivorRatio)) {
1264 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1265 }
1266 // If we decided above (or user explicitly requested)
1267 // `promote all' (via MaxTenuringThreshold := 0),
1268 // prefer minuscule survivor spaces so as not to waste
1269 // space for (non-existent) survivors
1270 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1271 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1272 }
1273 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1274 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1275 // This is done in order to make ParNew+CMS configuration to work
1276 // with YoungPLABSize and OldPLABSize options.
1277 // See CR 6362902.
1278 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1279 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1280 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1281 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1282 // the value (either from the command line or ergonomics) of
1283 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1284 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1285 } else {
1286 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1287 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1288 // we'll let it to take precedence.
1289 jio_fprintf(defaultStream::error_stream(),
1290 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1291 " options are specified for the CMS collector."
1292 " CMSParPromoteBlocksToClaim will take precedence.\n");
1293 }
1294 }
1295 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1296 // OldPLAB sizing manually turned off: Use a larger default setting,
1297 // unless it was manually specified. This is because a too-low value
1298 // will slow down scavenges.
1299 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1300 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1301 }
1302 }
1303 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1304 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1305 // If either of the static initialization defaults have changed, note this
1306 // modification.
1307 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1308 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1309 }
1310 if (PrintGCDetails && Verbose) {
1311 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1312 MarkStackSize / K, MarkStackSizeMax / K);
1313 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1314 }
1315 }
1316 #endif // INCLUDE_ALL_GCS
1317
1318 void set_object_alignment() {
1319 // Object alignment.
1320 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1321 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1322 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1323 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1324 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1325 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1326
1327 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1328 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1329
1330 // Oop encoding heap max
1331 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1332
1333 #if INCLUDE_ALL_GCS
1334 // Set CMS global values
1335 CompactibleFreeListSpace::set_cms_values();
1336 #endif // INCLUDE_ALL_GCS
1337 }
1338
1339 bool verify_object_alignment() {
1340 // Object alignment.
1341 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1342 jio_fprintf(defaultStream::error_stream(),
1343 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1344 (int)ObjectAlignmentInBytes);
1345 return false;
1346 }
1347 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1348 jio_fprintf(defaultStream::error_stream(),
1349 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1350 (int)ObjectAlignmentInBytes, BytesPerLong);
1351 return false;
1352 }
1353 // It does not make sense to have big object alignment
1354 // since a space lost due to alignment will be greater
1355 // then a saved space from compressed oops.
1356 if ((int)ObjectAlignmentInBytes > 256) {
1357 jio_fprintf(defaultStream::error_stream(),
1358 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1359 (int)ObjectAlignmentInBytes);
1360 return false;
1361 }
1362 // In case page size is very small.
1363 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1364 jio_fprintf(defaultStream::error_stream(),
1365 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1366 (int)ObjectAlignmentInBytes, os::vm_page_size());
1367 return false;
1368 }
1369 return true;
1370 }
1371
1372 inline uintx max_heap_for_compressed_oops() {
1373 // Avoid sign flip.
1374 if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) {
1375 return 0;
1376 }
1377 LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size());
1378 NOT_LP64(ShouldNotReachHere(); return 0);
1379 }
1380
1381 bool Arguments::should_auto_select_low_pause_collector() {
1382 if (UseAutoGCSelectPolicy &&
1383 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1384 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1385 if (PrintGCDetails) {
1386 // Cannot use gclog_or_tty yet.
1387 tty->print_cr("Automatic selection of the low pause collector"
1388 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1389 }
1390 return true;
1391 }
1392 return false;
1393 }
1394
1395 void Arguments::set_use_compressed_oops() {
1396 #ifndef ZERO
1397 #ifdef _LP64
1398 // MaxHeapSize is not set up properly at this point, but
1399 // the only value that can override MaxHeapSize if we are
1400 // to use UseCompressedOops is InitialHeapSize.
1401 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1402
1403 if (max_heap_size <= max_heap_for_compressed_oops()) {
1404 #if !defined(COMPILER1) || defined(TIERED)
1405 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1406 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1407 }
1408 #endif
1409 #ifdef _WIN64
1410 if (UseLargePages && UseCompressedOops) {
1411 // Cannot allocate guard pages for implicit checks in indexed addressing
1412 // mode, when large pages are specified on windows.
1413 // This flag could be switched ON if narrow oop base address is set to 0,
1414 // see code in Universe::initialize_heap().
1415 Universe::set_narrow_oop_use_implicit_null_checks(false);
1416 }
1417 #endif // _WIN64
1418 } else {
1419 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1420 warning("Max heap size too large for Compressed Oops");
1421 FLAG_SET_DEFAULT(UseCompressedOops, false);
1422 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1423 }
1424 }
1425 #endif // _LP64
1426 #endif // ZERO
1427 }
1428
1429 void Arguments::set_ergonomics_flags() {
1430
1431 if (os::is_server_class_machine()) {
1432 // If no other collector is requested explicitly,
1433 // let the VM select the collector based on
1434 // machine class and automatic selection policy.
1435 if (!UseSerialGC &&
1436 !UseConcMarkSweepGC &&
1437 !UseG1GC &&
1438 !UseParNewGC &&
1439 FLAG_IS_DEFAULT(UseParallelGC)) {
1440 if (should_auto_select_low_pause_collector()) {
1441 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1442 } else {
1443 FLAG_SET_ERGO(bool, UseParallelGC, true);
1444 }
1445 }
1446 // Shared spaces work fine with other GCs but causes bytecode rewriting
1447 // to be disabled, which hurts interpreter performance and decreases
1448 // server performance. On server class machines, keep the default
1449 // off unless it is asked for. Future work: either add bytecode rewriting
1450 // at link time, or rewrite bytecodes in non-shared methods.
1451 if (!DumpSharedSpaces && !RequireSharedSpaces) {
1452 no_shared_spaces();
1453 }
1454 }
1455
1456 #ifndef ZERO
1457 #ifdef _LP64
1458 set_use_compressed_oops();
1459 // UseCompressedOops must be on for UseCompressedKlassPointers to be on.
1460 if (!UseCompressedOops) {
1461 if (UseCompressedKlassPointers) {
1462 warning("UseCompressedKlassPointers requires UseCompressedOops");
1463 }
1464 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1465 } else {
1466 // Turn on UseCompressedKlassPointers too
1467 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) {
1468 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true);
1469 }
1470 // Set the ClassMetaspaceSize to something that will not need to be
1471 // expanded, since it cannot be expanded.
1472 if (UseCompressedKlassPointers) {
1473 if (ClassMetaspaceSize > KlassEncodingMetaspaceMax) {
1474 warning("Class metaspace size is too large for UseCompressedKlassPointers");
1475 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1476 } else if (FLAG_IS_DEFAULT(ClassMetaspaceSize)) {
1477 // 100,000 classes seems like a good size, so 100M assumes around 1K
1478 // per klass. The vtable and oopMap is embedded so we don't have a fixed
1479 // size per klass. Eventually, this will be parameterized because it
1480 // would also be useful to determine the optimal size of the
1481 // systemDictionary.
1482 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M);
1483 }
1484 }
1485 }
1486 // Also checks that certain machines are slower with compressed oops
1487 // in vm_version initialization code.
1488 #endif // _LP64
1489 #endif // !ZERO
1490 }
1491
1492 void Arguments::set_parallel_gc_flags() {
1493 assert(UseParallelGC || UseParallelOldGC, "Error");
1494 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1495 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1496 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1497 }
1498 FLAG_SET_DEFAULT(UseParallelGC, true);
1499
1500 // If no heap maximum was requested explicitly, use some reasonable fraction
1501 // of the physical memory, up to a maximum of 1GB.
1502 FLAG_SET_DEFAULT(ParallelGCThreads,
1503 Abstract_VM_Version::parallel_worker_threads());
1504 if (ParallelGCThreads == 0) {
1505 jio_fprintf(defaultStream::error_stream(),
1506 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1507 vm_exit(1);
1508 }
1509
1510
1511 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1512 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1513 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1514 // See CR 6362902 for details.
1515 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1516 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1517 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1518 }
1519 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1520 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1521 }
1522 }
1523
1524 if (UseParallelOldGC) {
1525 // Par compact uses lower default values since they are treated as
1526 // minimums. These are different defaults because of the different
1527 // interpretation and are not ergonomically set.
1528 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1529 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1530 }
1531 }
1532 }
1533
1534 void Arguments::set_g1_gc_flags() {
1535 assert(UseG1GC, "Error");
1536 #ifdef COMPILER1
1537 FastTLABRefill = false;
1538 #endif
1539 FLAG_SET_DEFAULT(ParallelGCThreads,
1540 Abstract_VM_Version::parallel_worker_threads());
1541 if (ParallelGCThreads == 0) {
1542 FLAG_SET_DEFAULT(ParallelGCThreads,
1543 Abstract_VM_Version::parallel_worker_threads());
1544 }
1545
1546 // MarkStackSize will be set (if it hasn't been set by the user)
1547 // when concurrent marking is initialized.
1548 // Its value will be based upon the number of parallel marking threads.
1549 // But we do set the maximum mark stack size here.
1550 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1551 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1552 }
1553
1554 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1555 // In G1, we want the default GC overhead goal to be higher than
1556 // say in PS. So we set it here to 10%. Otherwise the heap might
1557 // be expanded more aggressively than we would like it to. In
1558 // fact, even 10% seems to not be high enough in some cases
1559 // (especially small GC stress tests that the main thing they do
1560 // is allocation). We might consider increase it further.
1561 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1562 }
1563
1564 if (PrintGCDetails && Verbose) {
1565 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1566 MarkStackSize / K, MarkStackSizeMax / K);
1567 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1568 }
1569 }
1570
1571 julong Arguments::limit_by_allocatable_memory(julong limit) {
1572 julong max_allocatable;
1573 julong result = limit;
1574 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1575 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1576 }
1577 return result;
1578 }
1579
1580 void Arguments::set_heap_base_min_address() {
1581 if (FLAG_IS_DEFAULT(HeapBaseMinAddress) && UseG1GC && HeapBaseMinAddress < 1*G) {
1582 // By default HeapBaseMinAddress is 2G on all platforms except Solaris x86.
1583 // G1 currently needs a lot of C-heap, so on Solaris we have to give G1
1584 // some extra space for the C-heap compared to other collectors.
1585 // Use FLAG_SET_DEFAULT here rather than FLAG_SET_ERGO to make sure that
1586 // code that checks for default values work correctly.
1587 FLAG_SET_DEFAULT(HeapBaseMinAddress, 1*G);
1588 }
1589 }
1590
1591 void Arguments::set_heap_size() {
1592 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1593 // Deprecated flag
1594 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1595 }
1596
1597 const julong phys_mem =
1598 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1599 : (julong)MaxRAM;
1600
1601 // If the maximum heap size has not been set with -Xmx,
1602 // then set it as fraction of the size of physical memory,
1603 // respecting the maximum and minimum sizes of the heap.
1604 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1605 julong reasonable_max = phys_mem / MaxRAMFraction;
1606
1607 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1608 // Small physical memory, so use a minimum fraction of it for the heap
1609 reasonable_max = phys_mem / MinRAMFraction;
1610 } else {
1611 // Not-small physical memory, so require a heap at least
1612 // as large as MaxHeapSize
1613 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1614 }
1615 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1616 // Limit the heap size to ErgoHeapSizeLimit
1617 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1618 }
1619 if (UseCompressedOops) {
1620 // Limit the heap size to the maximum possible when using compressed oops
1621 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1622 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1623 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1624 // but it should be not less than default MaxHeapSize.
1625 max_coop_heap -= HeapBaseMinAddress;
1626 }
1627 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1628 }
1629 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1630
1631 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1632 // An initial heap size was specified on the command line,
1633 // so be sure that the maximum size is consistent. Done
1634 // after call to limit_by_allocatable_memory because that
1635 // method might reduce the allocation size.
1636 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1637 }
1638
1639 if (PrintGCDetails && Verbose) {
1640 // Cannot use gclog_or_tty yet.
1641 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1642 }
1643 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1644 }
1645
1646 // If the minimum or initial heap_size have not been set or requested to be set
1647 // ergonomically, set them accordingly.
1648 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1649 julong reasonable_minimum = (julong)(OldSize + NewSize);
1650
1651 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1652
1653 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1654
1655 if (InitialHeapSize == 0) {
1656 julong reasonable_initial = phys_mem / InitialRAMFraction;
1657
1658 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1659 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1660
1661 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1662
1663 if (PrintGCDetails && Verbose) {
1664 // Cannot use gclog_or_tty yet.
1665 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1666 }
1667 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1668 }
1669 // If the minimum heap size has not been set (via -Xms),
1670 // synchronize with InitialHeapSize to avoid errors with the default value.
1671 if (min_heap_size() == 0) {
1672 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1673 if (PrintGCDetails && Verbose) {
1674 // Cannot use gclog_or_tty yet.
1675 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1676 }
1677 }
1678 }
1679 }
1680
1681 // This must be called after ergonomics because we want bytecode rewriting
1682 // if the server compiler is used, or if UseSharedSpaces is disabled.
1683 void Arguments::set_bytecode_flags() {
1684 // Better not attempt to store into a read-only space.
1685 if (UseSharedSpaces) {
1686 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1687 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1688 }
1689
1690 if (!RewriteBytecodes) {
1691 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1692 }
1693 }
1694
1695 // Aggressive optimization flags -XX:+AggressiveOpts
1696 void Arguments::set_aggressive_opts_flags() {
1697 #ifdef COMPILER2
1698 if (AggressiveUnboxing) {
1699 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1700 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1701 } else if (!EliminateAutoBox) {
1702 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1703 AggressiveUnboxing = false;
1704 }
1705 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1706 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1707 } else if (!DoEscapeAnalysis) {
1708 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1709 AggressiveUnboxing = false;
1710 }
1711 }
1712 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1713 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1714 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1715 }
1716 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1717 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1718 }
1719
1720 // Feed the cache size setting into the JDK
1721 char buffer[1024];
1722 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1723 add_property(buffer);
1724 }
1725 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1726 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1727 }
1728 #endif
1729
1730 if (AggressiveOpts) {
1731 // Sample flag setting code
1732 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1733 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1734 // }
1735 }
1736 }
1737
1738 //===========================================================================================================
1739 // Parsing of java.compiler property
1740
1741 void Arguments::process_java_compiler_argument(char* arg) {
1742 // For backwards compatibility, Djava.compiler=NONE or ""
1743 // causes us to switch to -Xint mode UNLESS -Xdebug
1744 // is also specified.
1745 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1746 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1747 }
1748 }
1749
1750 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1751 _sun_java_launcher = strdup(launcher);
1752 if (strcmp("gamma", _sun_java_launcher) == 0) {
1753 _created_by_gamma_launcher = true;
1754 }
1755 }
1756
1757 bool Arguments::created_by_java_launcher() {
1758 assert(_sun_java_launcher != NULL, "property must have value");
1759 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1760 }
1761
1762 bool Arguments::created_by_gamma_launcher() {
1763 return _created_by_gamma_launcher;
1764 }
1765
1766 //===========================================================================================================
1767 // Parsing of main arguments
1768
1769 bool Arguments::verify_interval(uintx val, uintx min,
1770 uintx max, const char* name) {
1771 // Returns true iff value is in the inclusive interval [min..max]
1772 // false, otherwise.
1773 if (val >= min && val <= max) {
1774 return true;
1775 }
1776 jio_fprintf(defaultStream::error_stream(),
1777 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1778 " and " UINTX_FORMAT "\n",
1779 name, val, min, max);
1780 return false;
1781 }
1782
1783 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1784 // Returns true if given value is at least specified min threshold
1785 // false, otherwise.
1786 if (val >= min ) {
1787 return true;
1788 }
1789 jio_fprintf(defaultStream::error_stream(),
1790 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1791 name, val, min);
1792 return false;
1793 }
1794
1795 bool Arguments::verify_percentage(uintx value, const char* name) {
1796 if (value <= 100) {
1797 return true;
1798 }
1799 jio_fprintf(defaultStream::error_stream(),
1800 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1801 name, value);
1802 return false;
1803 }
1804
1805 #if !INCLUDE_ALL_GCS
1806 #ifdef ASSERT
1807 static bool verify_serial_gc_flags() {
1808 return (UseSerialGC &&
1809 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1810 UseParallelGC || UseParallelOldGC));
1811 }
1812 #endif // ASSERT
1813 #endif // INCLUDE_ALL_GCS
1814
1815 // check if do gclog rotation
1816 // +UseGCLogFileRotation is a must,
1817 // no gc log rotation when log file not supplied or
1818 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1819 void check_gclog_consistency() {
1820 if (UseGCLogFileRotation) {
1821 if ((Arguments::gc_log_filename() == NULL) ||
1822 (NumberOfGCLogFiles == 0) ||
1823 (GCLogFileSize == 0)) {
1824 jio_fprintf(defaultStream::output_stream(),
1825 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1826 "where num_of_file > 0 and num_of_size > 0\n"
1827 "GC log rotation is turned off\n");
1828 UseGCLogFileRotation = false;
1829 }
1830 }
1831
1832 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1833 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1834 jio_fprintf(defaultStream::output_stream(),
1835 "GCLogFileSize changed to minimum 8K\n");
1836 }
1837 }
1838
1839 // Check consistency of GC selection
1840 bool Arguments::check_gc_consistency() {
1841 check_gclog_consistency();
1842 bool status = true;
1843 // Ensure that the user has not selected conflicting sets
1844 // of collectors. [Note: this check is merely a user convenience;
1845 // collectors over-ride each other so that only a non-conflicting
1846 // set is selected; however what the user gets is not what they
1847 // may have expected from the combination they asked for. It's
1848 // better to reduce user confusion by not allowing them to
1849 // select conflicting combinations.
1850 uint i = 0;
1851 if (UseSerialGC) i++;
1852 if (UseConcMarkSweepGC || UseParNewGC) i++;
1853 if (UseParallelGC || UseParallelOldGC) i++;
1854 if (UseG1GC) i++;
1855 if (i > 1) {
1856 jio_fprintf(defaultStream::error_stream(),
1857 "Conflicting collector combinations in option list; "
1858 "please refer to the release notes for the combinations "
1859 "allowed\n");
1860 status = false;
1861 } else if (ReservedCodeCacheSize > 2*G) {
1862 // Code cache size larger than MAXINT is not supported.
1863 jio_fprintf(defaultStream::error_stream(),
1864 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
1865 (2*G)/M);
1866 status = false;
1867 }
1868 return status;
1869 }
1870
1871 void Arguments::check_deprecated_gcs() {
1872 if (UseConcMarkSweepGC && !UseParNewGC) {
1873 warning("Using the DefNew young collector with the CMS collector is deprecated "
1874 "and will likely be removed in a future release");
1875 }
1876
1877 if (UseParNewGC && !UseConcMarkSweepGC) {
1878 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
1879 // set up UseSerialGC properly, so that can't be used in the check here.
1880 warning("Using the ParNew young collector with the Serial old collector is deprecated "
1881 "and will likely be removed in a future release");
1882 }
1883
1884 if (CMSIncrementalMode) {
1885 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
1886 }
1887 }
1888
1889 void Arguments::check_deprecated_gc_flags() {
1890 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
1891 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
1892 "and will likely be removed in future release");
1893 }
1894 }
1895
1896 // Check stack pages settings
1897 bool Arguments::check_stack_pages()
1898 {
1899 bool status = true;
1900 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1901 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1902 // greater stack shadow pages can't generate instruction to bang stack
1903 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1904 return status;
1905 }
1906
1907 // Check the consistency of vm_init_args
1908 bool Arguments::check_vm_args_consistency() {
1909 // Method for adding checks for flag consistency.
1910 // The intent is to warn the user of all possible conflicts,
1911 // before returning an error.
1912 // Note: Needs platform-dependent factoring.
1913 bool status = true;
1914
1915 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1916 // builds so the cost of stack banging can be measured.
1917 #if (defined(PRODUCT) && defined(SOLARIS))
1918 if (!UseBoundThreads && !UseStackBanging) {
1919 jio_fprintf(defaultStream::error_stream(),
1920 "-UseStackBanging conflicts with -UseBoundThreads\n");
1921
1922 status = false;
1923 }
1924 #endif
1925
1926 if (TLABRefillWasteFraction == 0) {
1927 jio_fprintf(defaultStream::error_stream(),
1928 "TLABRefillWasteFraction should be a denominator, "
1929 "not " SIZE_FORMAT "\n",
1930 TLABRefillWasteFraction);
1931 status = false;
1932 }
1933
1934 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
1935 "AdaptiveSizePolicyWeight");
1936 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1937 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1938 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1939
1940 // Divide by bucket size to prevent a large size from causing rollover when
1941 // calculating amount of memory needed to be allocated for the String table.
1942 status = status && verify_interval(StringTableSize, minimumStringTableSize,
1943 (max_uintx / StringTable::bucket_size()), "StringTable size");
1944
1945 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1946 jio_fprintf(defaultStream::error_stream(),
1947 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1948 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1949 MinHeapFreeRatio, MaxHeapFreeRatio);
1950 status = false;
1951 }
1952 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1953 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1954
1955 // Min/MaxMetaspaceFreeRatio
1956 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
1957 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
1958
1959 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
1960 jio_fprintf(defaultStream::error_stream(),
1961 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
1962 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
1963 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
1964 MinMetaspaceFreeRatio,
1965 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
1966 MaxMetaspaceFreeRatio);
1967 status = false;
1968 }
1969
1970 // Trying to keep 100% free is not practical
1971 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
1972
1973 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1974 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1975 }
1976
1977 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1978 // Settings to encourage splitting.
1979 if (!FLAG_IS_CMDLINE(NewRatio)) {
1980 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
1981 }
1982 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1983 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1984 }
1985 }
1986
1987 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1988 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1989 if (GCTimeLimit == 100) {
1990 // Turn off gc-overhead-limit-exceeded checks
1991 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1992 }
1993
1994 status = status && check_gc_consistency();
1995 status = status && check_stack_pages();
1996
1997 if (CMSIncrementalMode) {
1998 if (!UseConcMarkSweepGC) {
1999 jio_fprintf(defaultStream::error_stream(),
2000 "error: invalid argument combination.\n"
2001 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2002 "selected in order\nto use CMSIncrementalMode.\n");
2003 status = false;
2004 } else {
2005 status = status && verify_percentage(CMSIncrementalDutyCycle,
2006 "CMSIncrementalDutyCycle");
2007 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2008 "CMSIncrementalDutyCycleMin");
2009 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2010 "CMSIncrementalSafetyFactor");
2011 status = status && verify_percentage(CMSIncrementalOffset,
2012 "CMSIncrementalOffset");
2013 status = status && verify_percentage(CMSExpAvgFactor,
2014 "CMSExpAvgFactor");
2015 // If it was not set on the command line, set
2016 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2017 if (CMSInitiatingOccupancyFraction < 0) {
2018 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2019 }
2020 }
2021 }
2022
2023 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2024 // insists that we hold the requisite locks so that the iteration is
2025 // MT-safe. For the verification at start-up and shut-down, we don't
2026 // yet have a good way of acquiring and releasing these locks,
2027 // which are not visible at the CollectedHeap level. We want to
2028 // be able to acquire these locks and then do the iteration rather
2029 // than just disable the lock verification. This will be fixed under
2030 // bug 4788986.
2031 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2032 if (VerifyDuringStartup) {
2033 warning("Heap verification at start-up disabled "
2034 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2035 VerifyDuringStartup = false; // Disable verification at start-up
2036 }
2037
2038 if (VerifyBeforeExit) {
2039 warning("Heap verification at shutdown disabled "
2040 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2041 VerifyBeforeExit = false; // Disable verification at shutdown
2042 }
2043 }
2044
2045 // Note: only executed in non-PRODUCT mode
2046 if (!UseAsyncConcMarkSweepGC &&
2047 (ExplicitGCInvokesConcurrent ||
2048 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2049 jio_fprintf(defaultStream::error_stream(),
2050 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2051 " with -UseAsyncConcMarkSweepGC");
2052 status = false;
2053 }
2054
2055 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2056
2057 #if INCLUDE_ALL_GCS
2058 if (UseG1GC) {
2059 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2060 "InitiatingHeapOccupancyPercent");
2061 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2062 "G1RefProcDrainInterval");
2063 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2064 "G1ConcMarkStepDurationMillis");
2065 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2066 "G1ConcRSHotCardLimit");
2067 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2068 "G1ConcRSLogCacheSize");
2069 }
2070 if (UseConcMarkSweepGC) {
2071 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2072 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2073 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2074 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2075
2076 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2077
2078 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2079 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2080 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2081
2082 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2083
2084 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2085 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2086
2087 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2088 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2089 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2090
2091 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2092
2093 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2094
2095 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2096 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2097 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2098 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2099 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2100 }
2101
2102 if (UseParallelGC || UseParallelOldGC) {
2103 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2104 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2105
2106 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2107 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2108
2109 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2110 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2111
2112 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2113
2114 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2115 }
2116 #endif // INCLUDE_ALL_GCS
2117
2118 status = status && verify_interval(RefDiscoveryPolicy,
2119 ReferenceProcessor::DiscoveryPolicyMin,
2120 ReferenceProcessor::DiscoveryPolicyMax,
2121 "RefDiscoveryPolicy");
2122
2123 // Limit the lower bound of this flag to 1 as it is used in a division
2124 // expression.
2125 status = status && verify_interval(TLABWasteTargetPercent,
2126 1, 100, "TLABWasteTargetPercent");
2127
2128 status = status && verify_object_alignment();
2129
2130 status = status && verify_min_value(ClassMetaspaceSize, 1*M,
2131 "ClassMetaspaceSize");
2132
2133 status = status && verify_interval(MarkStackSizeMax,
2134 1, (max_jint - 1), "MarkStackSizeMax");
2135 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2136
2137 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2138
2139 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2140
2141 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2142
2143 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2144 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2145
2146 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2147
2148 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2149 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2150 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2151 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2152
2153 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2154 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2155
2156 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2157 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2158 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2159
2160 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2161 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2162
2163 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2164 // just for that, so hardcode here.
2165 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2166 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2167 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2168 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2169
2170 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2171 #ifdef SPARC
2172 if (UseConcMarkSweepGC || UseG1GC) {
2173 // Issue a stern warning if the user has explicitly set
2174 // UseMemSetInBOT (it is known to cause issues), but allow
2175 // use for experimentation and debugging.
2176 if (VM_Version::is_sun4v() && UseMemSetInBOT) {
2177 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
2178 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
2179 " on sun4v; please understand that you are using at your own risk!");
2180 }
2181 }
2182 #endif // SPARC
2183
2184 if (PrintNMTStatistics) {
2185 #if INCLUDE_NMT
2186 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2187 #endif // INCLUDE_NMT
2188 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2189 PrintNMTStatistics = false;
2190 #if INCLUDE_NMT
2191 }
2192 #endif
2193 }
2194
2195 // Need to limit the extent of the padding to reasonable size.
2196 // 8K is well beyond the reasonable HW cache line size, even with the
2197 // aggressive prefetching, while still leaving the room for segregating
2198 // among the distinct pages.
2199 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2200 jio_fprintf(defaultStream::error_stream(),
2201 "ContendedPaddingWidth=" INTX_FORMAT " must be the between %d and %d\n",
2202 ContendedPaddingWidth, 0, 8192);
2203 status = false;
2204 }
2205
2206 // Need to enforce the padding not to break the existing field alignments.
2207 // It is sufficient to check against the largest type size.
2208 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2209 jio_fprintf(defaultStream::error_stream(),
2210 "ContendedPaddingWidth=" INTX_FORMAT " must be the multiple of %d\n",
2211 ContendedPaddingWidth, BytesPerLong);
2212 status = false;
2213 }
2214
2215 // Check lower bounds of the code cache
2216 // Template Interpreter code is approximately 3X larger in debug builds.
2217 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2218 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2219 jio_fprintf(defaultStream::error_stream(),
2220 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2221 os::vm_page_size()/K);
2222 status = false;
2223 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2224 jio_fprintf(defaultStream::error_stream(),
2225 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2226 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2227 status = false;
2228 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2229 jio_fprintf(defaultStream::error_stream(),
2230 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2231 min_code_cache_size/K);
2232 status = false;
2233 } else if (ReservedCodeCacheSize > 2*G) {
2234 // Code cache size larger than MAXINT is not supported.
2235 jio_fprintf(defaultStream::error_stream(),
2236 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2237 (2*G)/M);
2238 status = false;
2239 }
2240 return status;
2241 }
2242
2243 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2244 const char* option_type) {
2245 if (ignore) return false;
2246
2247 const char* spacer = " ";
2248 if (option_type == NULL) {
2249 option_type = ++spacer; // Set both to the empty string.
2250 }
2251
2252 if (os::obsolete_option(option)) {
2253 jio_fprintf(defaultStream::error_stream(),
2254 "Obsolete %s%soption: %s\n", option_type, spacer,
2255 option->optionString);
2256 return false;
2257 } else {
2258 jio_fprintf(defaultStream::error_stream(),
2259 "Unrecognized %s%soption: %s\n", option_type, spacer,
2260 option->optionString);
2261 return true;
2262 }
2263 }
2264
2265 static const char* user_assertion_options[] = {
2266 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2267 };
2268
2269 static const char* system_assertion_options[] = {
2270 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2271 };
2272
2273 // Return true if any of the strings in null-terminated array 'names' matches.
2274 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2275 // the option must match exactly.
2276 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2277 bool tail_allowed) {
2278 for (/* empty */; *names != NULL; ++names) {
2279 if (match_option(option, *names, tail)) {
2280 if (**tail == '\0' || tail_allowed && **tail == ':') {
2281 return true;
2282 }
2283 }
2284 }
2285 return false;
2286 }
2287
2288 bool Arguments::parse_uintx(const char* value,
2289 uintx* uintx_arg,
2290 uintx min_size) {
2291
2292 // Check the sign first since atomull() parses only unsigned values.
2293 bool value_is_positive = !(*value == '-');
2294
2295 if (value_is_positive) {
2296 julong n;
2297 bool good_return = atomull(value, &n);
2298 if (good_return) {
2299 bool above_minimum = n >= min_size;
2300 bool value_is_too_large = n > max_uintx;
2301
2302 if (above_minimum && !value_is_too_large) {
2303 *uintx_arg = n;
2304 return true;
2305 }
2306 }
2307 }
2308 return false;
2309 }
2310
2311 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2312 julong* long_arg,
2313 julong min_size) {
2314 if (!atomull(s, long_arg)) return arg_unreadable;
2315 return check_memory_size(*long_arg, min_size);
2316 }
2317
2318 // Parse JavaVMInitArgs structure
2319
2320 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2321 // For components of the system classpath.
2322 SysClassPath scp(Arguments::get_sysclasspath());
2323 bool scp_assembly_required = false;
2324
2325 // Save default settings for some mode flags
2326 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2327 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2328 Arguments::_ClipInlining = ClipInlining;
2329 Arguments::_BackgroundCompilation = BackgroundCompilation;
2330
2331 // Setup flags for mixed which is the default
2332 set_mode_flags(_mixed);
2333
2334 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2335 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2336 if (result != JNI_OK) {
2337 return result;
2338 }
2339
2340 // Parse JavaVMInitArgs structure passed in
2341 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2342 if (result != JNI_OK) {
2343 return result;
2344 }
2345
2346 if (AggressiveOpts) {
2347 // Insert alt-rt.jar between user-specified bootclasspath
2348 // prefix and the default bootclasspath. os::set_boot_path()
2349 // uses meta_index_dir as the default bootclasspath directory.
2350 const char* altclasses_jar = "alt-rt.jar";
2351 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2352 strlen(altclasses_jar);
2353 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal);
2354 strcpy(altclasses_path, get_meta_index_dir());
2355 strcat(altclasses_path, altclasses_jar);
2356 scp.add_suffix_to_prefix(altclasses_path);
2357 scp_assembly_required = true;
2358 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal);
2359 }
2360
2361 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2362 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2363 if (result != JNI_OK) {
2364 return result;
2365 }
2366
2367 // Do final processing now that all arguments have been parsed
2368 result = finalize_vm_init_args(&scp, scp_assembly_required);
2369 if (result != JNI_OK) {
2370 return result;
2371 }
2372
2373 return JNI_OK;
2374 }
2375
2376 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2377 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2378 // are dealing with -agentpath (case where name is a path), otherwise with
2379 // -agentlib
2380 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2381 char *_name;
2382 const char *_hprof = "hprof", *_jdwp = "jdwp";
2383 size_t _len_hprof, _len_jdwp, _len_prefix;
2384
2385 if (is_path) {
2386 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2387 return false;
2388 }
2389
2390 _name++; // skip past last path separator
2391 _len_prefix = strlen(JNI_LIB_PREFIX);
2392
2393 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2394 return false;
2395 }
2396
2397 _name += _len_prefix;
2398 _len_hprof = strlen(_hprof);
2399 _len_jdwp = strlen(_jdwp);
2400
2401 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2402 _name += _len_hprof;
2403 }
2404 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2405 _name += _len_jdwp;
2406 }
2407 else {
2408 return false;
2409 }
2410
2411 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2412 return false;
2413 }
2414
2415 return true;
2416 }
2417
2418 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2419 return true;
2420 }
2421
2422 return false;
2423 }
2424
2425 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2426 SysClassPath* scp_p,
2427 bool* scp_assembly_required_p,
2428 FlagValueOrigin origin) {
2429 // Remaining part of option string
2430 const char* tail;
2431
2432 // iterate over arguments
2433 for (int index = 0; index < args->nOptions; index++) {
2434 bool is_absolute_path = false; // for -agentpath vs -agentlib
2435
2436 const JavaVMOption* option = args->options + index;
2437
2438 if (!match_option(option, "-Djava.class.path", &tail) &&
2439 !match_option(option, "-Dsun.java.command", &tail) &&
2440 !match_option(option, "-Dsun.java.launcher", &tail)) {
2441
2442 // add all jvm options to the jvm_args string. This string
2443 // is used later to set the java.vm.args PerfData string constant.
2444 // the -Djava.class.path and the -Dsun.java.command options are
2445 // omitted from jvm_args string as each have their own PerfData
2446 // string constant object.
2447 build_jvm_args(option->optionString);
2448 }
2449
2450 // -verbose:[class/gc/jni]
2451 if (match_option(option, "-verbose", &tail)) {
2452 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2453 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2454 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2455 } else if (!strcmp(tail, ":gc")) {
2456 FLAG_SET_CMDLINE(bool, PrintGC, true);
2457 } else if (!strcmp(tail, ":jni")) {
2458 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2459 }
2460 // -da / -ea / -disableassertions / -enableassertions
2461 // These accept an optional class/package name separated by a colon, e.g.,
2462 // -da:java.lang.Thread.
2463 } else if (match_option(option, user_assertion_options, &tail, true)) {
2464 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2465 if (*tail == '\0') {
2466 JavaAssertions::setUserClassDefault(enable);
2467 } else {
2468 assert(*tail == ':', "bogus match by match_option()");
2469 JavaAssertions::addOption(tail + 1, enable);
2470 }
2471 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2472 } else if (match_option(option, system_assertion_options, &tail, false)) {
2473 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2474 JavaAssertions::setSystemClassDefault(enable);
2475 // -bootclasspath:
2476 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2477 scp_p->reset_path(tail);
2478 *scp_assembly_required_p = true;
2479 // -bootclasspath/a:
2480 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2481 scp_p->add_suffix(tail);
2482 *scp_assembly_required_p = true;
2483 // -bootclasspath/p:
2484 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2485 scp_p->add_prefix(tail);
2486 *scp_assembly_required_p = true;
2487 // -Xrun
2488 } else if (match_option(option, "-Xrun", &tail)) {
2489 if (tail != NULL) {
2490 const char* pos = strchr(tail, ':');
2491 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2492 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2493 name[len] = '\0';
2494
2495 char *options = NULL;
2496 if(pos != NULL) {
2497 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2498 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2499 }
2500 #if !INCLUDE_JVMTI
2501 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2502 jio_fprintf(defaultStream::error_stream(),
2503 "Profiling and debugging agents are not supported in this VM\n");
2504 return JNI_ERR;
2505 }
2506 #endif // !INCLUDE_JVMTI
2507 add_init_library(name, options);
2508 }
2509 // -agentlib and -agentpath
2510 } else if (match_option(option, "-agentlib:", &tail) ||
2511 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2512 if(tail != NULL) {
2513 const char* pos = strchr(tail, '=');
2514 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2515 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2516 name[len] = '\0';
2517
2518 char *options = NULL;
2519 if(pos != NULL) {
2520 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2521 }
2522 #if !INCLUDE_JVMTI
2523 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2524 jio_fprintf(defaultStream::error_stream(),
2525 "Profiling and debugging agents are not supported in this VM\n");
2526 return JNI_ERR;
2527 }
2528 #endif // !INCLUDE_JVMTI
2529 add_init_agent(name, options, is_absolute_path);
2530 }
2531 // -javaagent
2532 } else if (match_option(option, "-javaagent:", &tail)) {
2533 #if !INCLUDE_JVMTI
2534 jio_fprintf(defaultStream::error_stream(),
2535 "Instrumentation agents are not supported in this VM\n");
2536 return JNI_ERR;
2537 #else
2538 if(tail != NULL) {
2539 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2540 add_init_agent("instrument", options, false);
2541 }
2542 #endif // !INCLUDE_JVMTI
2543 // -Xnoclassgc
2544 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2545 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2546 // -Xincgc: i-CMS
2547 } else if (match_option(option, "-Xincgc", &tail)) {
2548 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2549 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2550 // -Xnoincgc: no i-CMS
2551 } else if (match_option(option, "-Xnoincgc", &tail)) {
2552 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2553 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2554 // -Xconcgc
2555 } else if (match_option(option, "-Xconcgc", &tail)) {
2556 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2557 // -Xnoconcgc
2558 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2559 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2560 // -Xbatch
2561 } else if (match_option(option, "-Xbatch", &tail)) {
2562 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2563 // -Xmn for compatibility with other JVM vendors
2564 } else if (match_option(option, "-Xmn", &tail)) {
2565 julong long_initial_eden_size = 0;
2566 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2567 if (errcode != arg_in_range) {
2568 jio_fprintf(defaultStream::error_stream(),
2569 "Invalid initial eden size: %s\n", option->optionString);
2570 describe_range_error(errcode);
2571 return JNI_EINVAL;
2572 }
2573 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2574 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2575 // -Xms
2576 } else if (match_option(option, "-Xms", &tail)) {
2577 julong long_initial_heap_size = 0;
2578 // an initial heap size of 0 means automatically determine
2579 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2580 if (errcode != arg_in_range) {
2581 jio_fprintf(defaultStream::error_stream(),
2582 "Invalid initial heap size: %s\n", option->optionString);
2583 describe_range_error(errcode);
2584 return JNI_EINVAL;
2585 }
2586 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2587 // Currently the minimum size and the initial heap sizes are the same.
2588 set_min_heap_size(InitialHeapSize);
2589 // -Xmx
2590 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2591 julong long_max_heap_size = 0;
2592 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2593 if (errcode != arg_in_range) {
2594 jio_fprintf(defaultStream::error_stream(),
2595 "Invalid maximum heap size: %s\n", option->optionString);
2596 describe_range_error(errcode);
2597 return JNI_EINVAL;
2598 }
2599 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2600 // Xmaxf
2601 } else if (match_option(option, "-Xmaxf", &tail)) {
2602 int maxf = (int)(atof(tail) * 100);
2603 if (maxf < 0 || maxf > 100) {
2604 jio_fprintf(defaultStream::error_stream(),
2605 "Bad max heap free percentage size: %s\n",
2606 option->optionString);
2607 return JNI_EINVAL;
2608 } else {
2609 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2610 }
2611 // Xminf
2612 } else if (match_option(option, "-Xminf", &tail)) {
2613 int minf = (int)(atof(tail) * 100);
2614 if (minf < 0 || minf > 100) {
2615 jio_fprintf(defaultStream::error_stream(),
2616 "Bad min heap free percentage size: %s\n",
2617 option->optionString);
2618 return JNI_EINVAL;
2619 } else {
2620 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2621 }
2622 // -Xss
2623 } else if (match_option(option, "-Xss", &tail)) {
2624 julong long_ThreadStackSize = 0;
2625 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2626 if (errcode != arg_in_range) {
2627 jio_fprintf(defaultStream::error_stream(),
2628 "Invalid thread stack size: %s\n", option->optionString);
2629 describe_range_error(errcode);
2630 return JNI_EINVAL;
2631 }
2632 // Internally track ThreadStackSize in units of 1024 bytes.
2633 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2634 round_to((int)long_ThreadStackSize, K) / K);
2635 // -Xoss
2636 } else if (match_option(option, "-Xoss", &tail)) {
2637 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2638 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2639 julong long_CodeCacheExpansionSize = 0;
2640 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2641 if (errcode != arg_in_range) {
2642 jio_fprintf(defaultStream::error_stream(),
2643 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2644 os::vm_page_size()/K);
2645 return JNI_EINVAL;
2646 }
2647 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2648 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2649 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2650 julong long_ReservedCodeCacheSize = 0;
2651
2652 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2653 if (errcode != arg_in_range) {
2654 jio_fprintf(defaultStream::error_stream(),
2655 "Invalid maximum code cache size: %s.\n", option->optionString);
2656 return JNI_EINVAL;
2657 }
2658 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2659 //-XX:IncreaseFirstTierCompileThresholdAt=
2660 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2661 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2662 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2663 jio_fprintf(defaultStream::error_stream(),
2664 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2665 option->optionString);
2666 return JNI_EINVAL;
2667 }
2668 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2669 // -green
2670 } else if (match_option(option, "-green", &tail)) {
2671 jio_fprintf(defaultStream::error_stream(),
2672 "Green threads support not available\n");
2673 return JNI_EINVAL;
2674 // -native
2675 } else if (match_option(option, "-native", &tail)) {
2676 // HotSpot always uses native threads, ignore silently for compatibility
2677 // -Xsqnopause
2678 } else if (match_option(option, "-Xsqnopause", &tail)) {
2679 // EVM option, ignore silently for compatibility
2680 // -Xrs
2681 } else if (match_option(option, "-Xrs", &tail)) {
2682 // Classic/EVM option, new functionality
2683 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2684 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2685 // change default internal VM signals used - lower case for back compat
2686 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2687 // -Xoptimize
2688 } else if (match_option(option, "-Xoptimize", &tail)) {
2689 // EVM option, ignore silently for compatibility
2690 // -Xprof
2691 } else if (match_option(option, "-Xprof", &tail)) {
2692 #if INCLUDE_FPROF
2693 _has_profile = true;
2694 #else // INCLUDE_FPROF
2695 jio_fprintf(defaultStream::error_stream(),
2696 "Flat profiling is not supported in this VM.\n");
2697 return JNI_ERR;
2698 #endif // INCLUDE_FPROF
2699 // -Xconcurrentio
2700 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2701 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2702 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2703 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2704 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2705 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2706
2707 // -Xinternalversion
2708 } else if (match_option(option, "-Xinternalversion", &tail)) {
2709 jio_fprintf(defaultStream::output_stream(), "%s\n",
2710 VM_Version::internal_vm_info_string());
2711 vm_exit(0);
2712 #ifndef PRODUCT
2713 // -Xprintflags
2714 } else if (match_option(option, "-Xprintflags", &tail)) {
2715 CommandLineFlags::printFlags(tty, false);
2716 vm_exit(0);
2717 #endif
2718 // -D
2719 } else if (match_option(option, "-D", &tail)) {
2720 if (!add_property(tail)) {
2721 return JNI_ENOMEM;
2722 }
2723 // Out of the box management support
2724 if (match_option(option, "-Dcom.sun.management", &tail)) {
2725 #if INCLUDE_MANAGEMENT
2726 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2727 #else
2728 jio_fprintf(defaultStream::output_stream(),
2729 "-Dcom.sun.management is not supported in this VM.\n");
2730 return JNI_ERR;
2731 #endif
2732 }
2733 // -Xint
2734 } else if (match_option(option, "-Xint", &tail)) {
2735 set_mode_flags(_int);
2736 // -Xmixed
2737 } else if (match_option(option, "-Xmixed", &tail)) {
2738 set_mode_flags(_mixed);
2739 // -Xcomp
2740 } else if (match_option(option, "-Xcomp", &tail)) {
2741 // for testing the compiler; turn off all flags that inhibit compilation
2742 set_mode_flags(_comp);
2743 // -Xshare:dump
2744 } else if (match_option(option, "-Xshare:dump", &tail)) {
2745 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2746 set_mode_flags(_int); // Prevent compilation, which creates objects
2747 // -Xshare:on
2748 } else if (match_option(option, "-Xshare:on", &tail)) {
2749 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2750 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2751 // -Xshare:auto
2752 } else if (match_option(option, "-Xshare:auto", &tail)) {
2753 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2754 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2755 // -Xshare:off
2756 } else if (match_option(option, "-Xshare:off", &tail)) {
2757 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2758 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2759 // -Xverify
2760 } else if (match_option(option, "-Xverify", &tail)) {
2761 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2762 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2763 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2764 } else if (strcmp(tail, ":remote") == 0) {
2765 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2766 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2767 } else if (strcmp(tail, ":none") == 0) {
2768 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2769 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2770 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2771 return JNI_EINVAL;
2772 }
2773 // -Xdebug
2774 } else if (match_option(option, "-Xdebug", &tail)) {
2775 // note this flag has been used, then ignore
2776 set_xdebug_mode(true);
2777 // -Xnoagent
2778 } else if (match_option(option, "-Xnoagent", &tail)) {
2779 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2780 } else if (match_option(option, "-Xboundthreads", &tail)) {
2781 // Bind user level threads to kernel threads (Solaris only)
2782 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2783 } else if (match_option(option, "-Xloggc:", &tail)) {
2784 // Redirect GC output to the file. -Xloggc:<filename>
2785 // ostream_init_log(), when called will use this filename
2786 // to initialize a fileStream.
2787 _gc_log_filename = strdup(tail);
2788 FLAG_SET_CMDLINE(bool, PrintGC, true);
2789 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2790
2791 // JNI hooks
2792 } else if (match_option(option, "-Xcheck", &tail)) {
2793 if (!strcmp(tail, ":jni")) {
2794 #if !INCLUDE_JNI_CHECK
2795 warning("JNI CHECKING is not supported in this VM");
2796 #else
2797 CheckJNICalls = true;
2798 #endif // INCLUDE_JNI_CHECK
2799 } else if (is_bad_option(option, args->ignoreUnrecognized,
2800 "check")) {
2801 return JNI_EINVAL;
2802 }
2803 } else if (match_option(option, "vfprintf", &tail)) {
2804 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2805 } else if (match_option(option, "exit", &tail)) {
2806 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2807 } else if (match_option(option, "abort", &tail)) {
2808 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2809 // -XX:+AggressiveHeap
2810 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2811
2812 // This option inspects the machine and attempts to set various
2813 // parameters to be optimal for long-running, memory allocation
2814 // intensive jobs. It is intended for machines with large
2815 // amounts of cpu and memory.
2816
2817 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2818 // VM, but we may not be able to represent the total physical memory
2819 // available (like having 8gb of memory on a box but using a 32bit VM).
2820 // Thus, we need to make sure we're using a julong for intermediate
2821 // calculations.
2822 julong initHeapSize;
2823 julong total_memory = os::physical_memory();
2824
2825 if (total_memory < (julong)256*M) {
2826 jio_fprintf(defaultStream::error_stream(),
2827 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2828 vm_exit(1);
2829 }
2830
2831 // The heap size is half of available memory, or (at most)
2832 // all of possible memory less 160mb (leaving room for the OS
2833 // when using ISM). This is the maximum; because adaptive sizing
2834 // is turned on below, the actual space used may be smaller.
2835
2836 initHeapSize = MIN2(total_memory / (julong)2,
2837 total_memory - (julong)160*M);
2838
2839 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2840
2841 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2842 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2843 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2844 // Currently the minimum size and the initial heap sizes are the same.
2845 set_min_heap_size(initHeapSize);
2846 }
2847 if (FLAG_IS_DEFAULT(NewSize)) {
2848 // Make the young generation 3/8ths of the total heap.
2849 FLAG_SET_CMDLINE(uintx, NewSize,
2850 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2851 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2852 }
2853
2854 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2855 FLAG_SET_DEFAULT(UseLargePages, true);
2856 #endif
2857
2858 // Increase some data structure sizes for efficiency
2859 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2860 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2861 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2862
2863 // See the OldPLABSize comment below, but replace 'after promotion'
2864 // with 'after copying'. YoungPLABSize is the size of the survivor
2865 // space per-gc-thread buffers. The default is 4kw.
2866 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2867
2868 // OldPLABSize is the size of the buffers in the old gen that
2869 // UseParallelGC uses to promote live data that doesn't fit in the
2870 // survivor spaces. At any given time, there's one for each gc thread.
2871 // The default size is 1kw. These buffers are rarely used, since the
2872 // survivor spaces are usually big enough. For specjbb, however, there
2873 // are occasions when there's lots of live data in the young gen
2874 // and we end up promoting some of it. We don't have a definite
2875 // explanation for why bumping OldPLABSize helps, but the theory
2876 // is that a bigger PLAB results in retaining something like the
2877 // original allocation order after promotion, which improves mutator
2878 // locality. A minor effect may be that larger PLABs reduce the
2879 // number of PLAB allocation events during gc. The value of 8kw
2880 // was arrived at by experimenting with specjbb.
2881 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2882
2883 // Enable parallel GC and adaptive generation sizing
2884 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2885 FLAG_SET_DEFAULT(ParallelGCThreads,
2886 Abstract_VM_Version::parallel_worker_threads());
2887
2888 // Encourage steady state memory management
2889 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2890
2891 // This appears to improve mutator locality
2892 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2893
2894 // Get around early Solaris scheduling bug
2895 // (affinity vs other jobs on system)
2896 // but disallow DR and offlining (5008695).
2897 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2898
2899 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2900 // The last option must always win.
2901 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2902 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2903 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2904 // The last option must always win.
2905 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2906 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2907 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2908 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2909 jio_fprintf(defaultStream::error_stream(),
2910 "Please use CMSClassUnloadingEnabled in place of "
2911 "CMSPermGenSweepingEnabled in the future\n");
2912 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2913 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2914 jio_fprintf(defaultStream::error_stream(),
2915 "Please use -XX:+UseGCOverheadLimit in place of "
2916 "-XX:+UseGCTimeLimit in the future\n");
2917 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2918 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2919 jio_fprintf(defaultStream::error_stream(),
2920 "Please use -XX:-UseGCOverheadLimit in place of "
2921 "-XX:-UseGCTimeLimit in the future\n");
2922 // The TLE options are for compatibility with 1.3 and will be
2923 // removed without notice in a future release. These options
2924 // are not to be documented.
2925 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2926 // No longer used.
2927 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2928 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2929 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2930 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2931 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2932 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2933 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2934 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2935 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2936 // No longer used.
2937 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2938 julong long_tlab_size = 0;
2939 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2940 if (errcode != arg_in_range) {
2941 jio_fprintf(defaultStream::error_stream(),
2942 "Invalid TLAB size: %s\n", option->optionString);
2943 describe_range_error(errcode);
2944 return JNI_EINVAL;
2945 }
2946 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2947 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2948 // No longer used.
2949 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2950 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2951 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2952 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2953 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2954 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2955 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2956 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2957 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2958 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2959 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2960 #if defined(DTRACE_ENABLED)
2961 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2962 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2963 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2964 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2965 #else // defined(DTRACE_ENABLED)
2966 jio_fprintf(defaultStream::error_stream(),
2967 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2968 return JNI_EINVAL;
2969 #endif // defined(DTRACE_ENABLED)
2970 #ifdef ASSERT
2971 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2972 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2973 // disable scavenge before parallel mark-compact
2974 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2975 #endif
2976 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2977 julong cms_blocks_to_claim = (julong)atol(tail);
2978 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2979 jio_fprintf(defaultStream::error_stream(),
2980 "Please use -XX:OldPLABSize in place of "
2981 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2982 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2983 julong cms_blocks_to_claim = (julong)atol(tail);
2984 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2985 jio_fprintf(defaultStream::error_stream(),
2986 "Please use -XX:OldPLABSize in place of "
2987 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2988 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2989 julong old_plab_size = 0;
2990 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2991 if (errcode != arg_in_range) {
2992 jio_fprintf(defaultStream::error_stream(),
2993 "Invalid old PLAB size: %s\n", option->optionString);
2994 describe_range_error(errcode);
2995 return JNI_EINVAL;
2996 }
2997 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2998 jio_fprintf(defaultStream::error_stream(),
2999 "Please use -XX:OldPLABSize in place of "
3000 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3001 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3002 julong young_plab_size = 0;
3003 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3004 if (errcode != arg_in_range) {
3005 jio_fprintf(defaultStream::error_stream(),
3006 "Invalid young PLAB size: %s\n", option->optionString);
3007 describe_range_error(errcode);
3008 return JNI_EINVAL;
3009 }
3010 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3011 jio_fprintf(defaultStream::error_stream(),
3012 "Please use -XX:YoungPLABSize in place of "
3013 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3014 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3015 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3016 julong stack_size = 0;
3017 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3018 if (errcode != arg_in_range) {
3019 jio_fprintf(defaultStream::error_stream(),
3020 "Invalid mark stack size: %s\n", option->optionString);
3021 describe_range_error(errcode);
3022 return JNI_EINVAL;
3023 }
3024 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3025 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3026 julong max_stack_size = 0;
3027 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3028 if (errcode != arg_in_range) {
3029 jio_fprintf(defaultStream::error_stream(),
3030 "Invalid maximum mark stack size: %s\n",
3031 option->optionString);
3032 describe_range_error(errcode);
3033 return JNI_EINVAL;
3034 }
3035 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3036 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3037 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3038 uintx conc_threads = 0;
3039 if (!parse_uintx(tail, &conc_threads, 1)) {
3040 jio_fprintf(defaultStream::error_stream(),
3041 "Invalid concurrent threads: %s\n", option->optionString);
3042 return JNI_EINVAL;
3043 }
3044 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3045 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3046 julong max_direct_memory_size = 0;
3047 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3048 if (errcode != arg_in_range) {
3049 jio_fprintf(defaultStream::error_stream(),
3050 "Invalid maximum direct memory size: %s\n",
3051 option->optionString);
3052 describe_range_error(errcode);
3053 return JNI_EINVAL;
3054 }
3055 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3056 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3057 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3058 // away and will cause VM initialization failures!
3059 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3060 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3061 #if !INCLUDE_MANAGEMENT
3062 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3063 jio_fprintf(defaultStream::error_stream(),
3064 "ManagementServer is not supported in this VM.\n");
3065 return JNI_ERR;
3066 #endif // INCLUDE_MANAGEMENT
3067 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3068 // Skip -XX:Flags= since that case has already been handled
3069 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3070 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3071 return JNI_EINVAL;
3072 }
3073 }
3074 // Unknown option
3075 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3076 return JNI_ERR;
3077 }
3078 }
3079
3080 // Change the default value for flags which have different default values
3081 // when working with older JDKs.
3082 #ifdef LINUX
3083 if (JDK_Version::current().compare_major(6) <= 0 &&
3084 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3085 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3086 }
3087 #endif // LINUX
3088 return JNI_OK;
3089 }
3090
3091 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3092 // This must be done after all -D arguments have been processed.
3093 scp_p->expand_endorsed();
3094
3095 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3096 // Assemble the bootclasspath elements into the final path.
3097 Arguments::set_sysclasspath(scp_p->combined_path());
3098 }
3099
3100 // This must be done after all arguments have been processed.
3101 // java_compiler() true means set to "NONE" or empty.
3102 if (java_compiler() && !xdebug_mode()) {
3103 // For backwards compatibility, we switch to interpreted mode if
3104 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3105 // not specified.
3106 set_mode_flags(_int);
3107 }
3108 if (CompileThreshold == 0) {
3109 set_mode_flags(_int);
3110 }
3111
3112 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3113 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3114 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3115 }
3116
3117 #ifndef COMPILER2
3118 // Don't degrade server performance for footprint
3119 if (FLAG_IS_DEFAULT(UseLargePages) &&
3120 MaxHeapSize < LargePageHeapSizeThreshold) {
3121 // No need for large granularity pages w/small heaps.
3122 // Note that large pages are enabled/disabled for both the
3123 // Java heap and the code cache.
3124 FLAG_SET_DEFAULT(UseLargePages, false);
3125 }
3126
3127 // Tiered compilation is undefined with C1.
3128 TieredCompilation = false;
3129 #else
3130 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3131 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3132 }
3133 #endif
3134
3135 // If we are running in a headless jre, force java.awt.headless property
3136 // to be true unless the property has already been set.
3137 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3138 if (os::is_headless_jre()) {
3139 const char* headless = Arguments::get_property("java.awt.headless");
3140 if (headless == NULL) {
3141 char envbuffer[128];
3142 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3143 if (!add_property("java.awt.headless=true")) {
3144 return JNI_ENOMEM;
3145 }
3146 } else {
3147 char buffer[256];
3148 strcpy(buffer, "java.awt.headless=");
3149 strcat(buffer, envbuffer);
3150 if (!add_property(buffer)) {
3151 return JNI_ENOMEM;
3152 }
3153 }
3154 }
3155 }
3156
3157 if (!check_vm_args_consistency()) {
3158 return JNI_ERR;
3159 }
3160
3161 return JNI_OK;
3162 }
3163
3164 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3165 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3166 scp_assembly_required_p);
3167 }
3168
3169 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3170 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3171 scp_assembly_required_p);
3172 }
3173
3174 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3175 const int N_MAX_OPTIONS = 64;
3176 const int OPTION_BUFFER_SIZE = 1024;
3177 char buffer[OPTION_BUFFER_SIZE];
3178
3179 // The variable will be ignored if it exceeds the length of the buffer.
3180 // Don't check this variable if user has special privileges
3181 // (e.g. unix su command).
3182 if (os::getenv(name, buffer, sizeof(buffer)) &&
3183 !os::have_special_privileges()) {
3184 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3185 jio_fprintf(defaultStream::error_stream(),
3186 "Picked up %s: %s\n", name, buffer);
3187 char* rd = buffer; // pointer to the input string (rd)
3188 int i;
3189 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3190 while (isspace(*rd)) rd++; // skip whitespace
3191 if (*rd == 0) break; // we re done when the input string is read completely
3192
3193 // The output, option string, overwrites the input string.
3194 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3195 // input string (rd).
3196 char* wrt = rd;
3197
3198 options[i++].optionString = wrt; // Fill in option
3199 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3200 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3201 int quote = *rd; // matching quote to look for
3202 rd++; // don't copy open quote
3203 while (*rd != quote) { // include everything (even spaces) up until quote
3204 if (*rd == 0) { // string termination means unmatched string
3205 jio_fprintf(defaultStream::error_stream(),
3206 "Unmatched quote in %s\n", name);
3207 return JNI_ERR;
3208 }
3209 *wrt++ = *rd++; // copy to option string
3210 }
3211 rd++; // don't copy close quote
3212 } else {
3213 *wrt++ = *rd++; // copy to option string
3214 }
3215 }
3216 // Need to check if we're done before writing a NULL,
3217 // because the write could be to the byte that rd is pointing to.
3218 if (*rd++ == 0) {
3219 *wrt = 0;
3220 break;
3221 }
3222 *wrt = 0; // Zero terminate option
3223 }
3224 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3225 JavaVMInitArgs vm_args;
3226 vm_args.version = JNI_VERSION_1_2;
3227 vm_args.options = options;
3228 vm_args.nOptions = i;
3229 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3230
3231 if (PrintVMOptions) {
3232 const char* tail;
3233 for (int i = 0; i < vm_args.nOptions; i++) {
3234 const JavaVMOption *option = vm_args.options + i;
3235 if (match_option(option, "-XX:", &tail)) {
3236 logOption(tail);
3237 }
3238 }
3239 }
3240
3241 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
3242 }
3243 return JNI_OK;
3244 }
3245
3246 void Arguments::set_shared_spaces_flags() {
3247 #ifdef _LP64
3248 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
3249
3250 // CompressedOops cannot be used with CDS. The offsets of oopmaps and
3251 // static fields are incorrect in the archive. With some more clever
3252 // initialization, this restriction can probably be lifted.
3253 if (UseCompressedOops) {
3254 if (must_share) {
3255 warning("disabling compressed oops because of %s",
3256 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
3257 FLAG_SET_CMDLINE(bool, UseCompressedOops, false);
3258 FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false);
3259 } else {
3260 // Prefer compressed oops to class data sharing
3261 if (UseSharedSpaces && Verbose) {
3262 warning("turning off use of shared archive because of compressed oops");
3263 }
3264 no_shared_spaces();
3265 }
3266 }
3267 #endif
3268
3269 if (DumpSharedSpaces) {
3270 if (RequireSharedSpaces) {
3271 warning("cannot dump shared archive while using shared archive");
3272 }
3273 UseSharedSpaces = false;
3274 }
3275 }
3276
3277 // Disable options not supported in this release, with a warning if they
3278 // were explicitly requested on the command-line
3279 #define UNSUPPORTED_OPTION(opt, description) \
3280 do { \
3281 if (opt) { \
3282 if (FLAG_IS_CMDLINE(opt)) { \
3283 warning(description " is disabled in this release."); \
3284 } \
3285 FLAG_SET_DEFAULT(opt, false); \
3286 } \
3287 } while(0)
3288
3289
3290 #define UNSUPPORTED_GC_OPTION(gc) \
3291 do { \
3292 if (gc) { \
3293 if (FLAG_IS_CMDLINE(gc)) { \
3294 warning(#gc " is not supported in this VM. Using Serial GC."); \
3295 } \
3296 FLAG_SET_DEFAULT(gc, false); \
3297 } \
3298 } while(0)
3299
3300 #if !INCLUDE_ALL_GCS
3301 static void force_serial_gc() {
3302 FLAG_SET_DEFAULT(UseSerialGC, true);
3303 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3304 UNSUPPORTED_GC_OPTION(UseG1GC);
3305 UNSUPPORTED_GC_OPTION(UseParallelGC);
3306 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3307 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3308 UNSUPPORTED_GC_OPTION(UseParNewGC);
3309 }
3310 #endif // INCLUDE_ALL_GCS
3311
3312 // Sharing support
3313 // Construct the path to the archive
3314 static char* get_shared_archive_path() {
3315 char *shared_archive_path;
3316 if (SharedArchiveFile == NULL) {
3317 char jvm_path[JVM_MAXPATHLEN];
3318 os::jvm_path(jvm_path, sizeof(jvm_path));
3319 char *end = strrchr(jvm_path, *os::file_separator());
3320 if (end != NULL) *end = '\0';
3321 size_t jvm_path_len = strlen(jvm_path);
3322 size_t file_sep_len = strlen(os::file_separator());
3323 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3324 file_sep_len + 20, mtInternal);
3325 if (shared_archive_path != NULL) {
3326 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3327 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3328 strncat(shared_archive_path, "classes.jsa", 11);
3329 }
3330 } else {
3331 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3332 if (shared_archive_path != NULL) {
3333 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3334 }
3335 }
3336 return shared_archive_path;
3337 }
3338
3339 // Parse entry point called from JNI_CreateJavaVM
3340
3341 jint Arguments::parse(const JavaVMInitArgs* args) {
3342
3343 // Remaining part of option string
3344 const char* tail;
3345
3346 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3347 const char* hotspotrc = ".hotspotrc";
3348 bool settings_file_specified = false;
3349 bool needs_hotspotrc_warning = false;
3350
3351 const char* flags_file;
3352 int index;
3353 for (index = 0; index < args->nOptions; index++) {
3354 const JavaVMOption *option = args->options + index;
3355 if (match_option(option, "-XX:Flags=", &tail)) {
3356 flags_file = tail;
3357 settings_file_specified = true;
3358 }
3359 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3360 PrintVMOptions = true;
3361 }
3362 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3363 PrintVMOptions = false;
3364 }
3365 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3366 IgnoreUnrecognizedVMOptions = true;
3367 }
3368 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3369 IgnoreUnrecognizedVMOptions = false;
3370 }
3371 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3372 CommandLineFlags::printFlags(tty, false);
3373 vm_exit(0);
3374 }
3375 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3376 #if INCLUDE_NMT
3377 MemTracker::init_tracking_options(tail);
3378 #else
3379 jio_fprintf(defaultStream::error_stream(),
3380 "Native Memory Tracking is not supported in this VM\n");
3381 return JNI_ERR;
3382 #endif
3383 }
3384
3385
3386 #ifndef PRODUCT
3387 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3388 CommandLineFlags::printFlags(tty, true);
3389 vm_exit(0);
3390 }
3391 #endif
3392 }
3393
3394 if (IgnoreUnrecognizedVMOptions) {
3395 // uncast const to modify the flag args->ignoreUnrecognized
3396 *(jboolean*)(&args->ignoreUnrecognized) = true;
3397 }
3398
3399 // Parse specified settings file
3400 if (settings_file_specified) {
3401 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3402 return JNI_EINVAL;
3403 }
3404 } else {
3405 #ifdef ASSERT
3406 // Parse default .hotspotrc settings file
3407 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3408 return JNI_EINVAL;
3409 }
3410 #else
3411 struct stat buf;
3412 if (os::stat(hotspotrc, &buf) == 0) {
3413 needs_hotspotrc_warning = true;
3414 }
3415 #endif
3416 }
3417
3418 if (PrintVMOptions) {
3419 for (index = 0; index < args->nOptions; index++) {
3420 const JavaVMOption *option = args->options + index;
3421 if (match_option(option, "-XX:", &tail)) {
3422 logOption(tail);
3423 }
3424 }
3425 }
3426
3427 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3428 jint result = parse_vm_init_args(args);
3429 if (result != JNI_OK) {
3430 return result;
3431 }
3432
3433 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3434 SharedArchivePath = get_shared_archive_path();
3435 if (SharedArchivePath == NULL) {
3436 return JNI_ENOMEM;
3437 }
3438
3439 // Delay warning until here so that we've had a chance to process
3440 // the -XX:-PrintWarnings flag
3441 if (needs_hotspotrc_warning) {
3442 warning("%s file is present but has been ignored. "
3443 "Run with -XX:Flags=%s to load the file.",
3444 hotspotrc, hotspotrc);
3445 }
3446
3447 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3448 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3449 #endif
3450
3451 #if INCLUDE_ALL_GCS
3452 #if (defined JAVASE_EMBEDDED || defined ARM)
3453 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3454 #endif
3455 #endif
3456
3457 #ifndef PRODUCT
3458 if (TraceBytecodesAt != 0) {
3459 TraceBytecodes = true;
3460 }
3461 if (CountCompiledCalls) {
3462 if (UseCounterDecay) {
3463 warning("UseCounterDecay disabled because CountCalls is set");
3464 UseCounterDecay = false;
3465 }
3466 }
3467 #endif // PRODUCT
3468
3469 // JSR 292 is not supported before 1.7
3470 if (!JDK_Version::is_gte_jdk17x_version()) {
3471 if (EnableInvokeDynamic) {
3472 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3473 warning("JSR 292 is not supported before 1.7. Disabling support.");
3474 }
3475 EnableInvokeDynamic = false;
3476 }
3477 }
3478
3479 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3480 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3481 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3482 }
3483 ScavengeRootsInCode = 1;
3484 }
3485
3486 if (PrintGCDetails) {
3487 // Turn on -verbose:gc options as well
3488 PrintGC = true;
3489 }
3490
3491 if (!JDK_Version::is_gte_jdk18x_version()) {
3492 // To avoid changing the log format for 7 updates this flag is only
3493 // true by default in JDK8 and above.
3494 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3495 FLAG_SET_DEFAULT(PrintGCCause, false);
3496 }
3497 }
3498
3499 // Set object alignment values.
3500 set_object_alignment();
3501
3502 #if !INCLUDE_ALL_GCS
3503 force_serial_gc();
3504 #endif // INCLUDE_ALL_GCS
3505 #if !INCLUDE_CDS
3506 if (DumpSharedSpaces || RequireSharedSpaces) {
3507 jio_fprintf(defaultStream::error_stream(),
3508 "Shared spaces are not supported in this VM\n");
3509 return JNI_ERR;
3510 }
3511 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3512 warning("Shared spaces are not supported in this VM");
3513 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3514 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3515 }
3516 no_shared_spaces();
3517 #endif // INCLUDE_CDS
3518
3519 // Set flags based on ergonomics.
3520 set_ergonomics_flags();
3521
3522 set_shared_spaces_flags();
3523
3524 // Check the GC selections again.
3525 if (!check_gc_consistency()) {
3526 return JNI_EINVAL;
3527 }
3528
3529 if (TieredCompilation) {
3530 set_tiered_flags();
3531 } else {
3532 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3533 if (CompilationPolicyChoice >= 2) {
3534 vm_exit_during_initialization(
3535 "Incompatible compilation policy selected", NULL);
3536 }
3537 }
3538
3539 set_heap_base_min_address();
3540
3541 // Set heap size based on available physical memory
3542 set_heap_size();
3543
3544 #if INCLUDE_ALL_GCS
3545 // Set per-collector flags
3546 if (UseParallelGC || UseParallelOldGC) {
3547 set_parallel_gc_flags();
3548 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3549 set_cms_and_parnew_gc_flags();
3550 } else if (UseParNewGC) { // skipped if CMS is set above
3551 set_parnew_gc_flags();
3552 } else if (UseG1GC) {
3553 set_g1_gc_flags();
3554 }
3555 check_deprecated_gcs();
3556 check_deprecated_gc_flags();
3557 if (AssumeMP && !UseSerialGC) {
3558 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3559 warning("If the number of processors is expected to increase from one, then"
3560 " you should configure the number of parallel GC threads appropriately"
3561 " using -XX:ParallelGCThreads=N");
3562 }
3563 }
3564 #else // INCLUDE_ALL_GCS
3565 assert(verify_serial_gc_flags(), "SerialGC unset");
3566 #endif // INCLUDE_ALL_GCS
3567
3568 // Set bytecode rewriting flags
3569 set_bytecode_flags();
3570
3571 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3572 set_aggressive_opts_flags();
3573
3574 // Turn off biased locking for locking debug mode flags,
3575 // which are subtlely different from each other but neither works with
3576 // biased locking.
3577 if (UseHeavyMonitors
3578 #ifdef COMPILER1
3579 || !UseFastLocking
3580 #endif // COMPILER1
3581 ) {
3582 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3583 // flag set to true on command line; warn the user that they
3584 // can't enable biased locking here
3585 warning("Biased Locking is not supported with locking debug flags"
3586 "; ignoring UseBiasedLocking flag." );
3587 }
3588 UseBiasedLocking = false;
3589 }
3590
3591 #ifdef CC_INTERP
3592 // Clear flags not supported by the C++ interpreter
3593 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3594 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3595 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3596 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false));
3597 #endif // CC_INTERP
3598
3599 #ifdef COMPILER2
3600 if (!UseBiasedLocking || EmitSync != 0) {
3601 UseOptoBiasInlining = false;
3602 }
3603 if (!EliminateLocks) {
3604 EliminateNestedLocks = false;
3605 }
3606 if (!Inline) {
3607 IncrementalInline = false;
3608 }
3609 #ifndef PRODUCT
3610 if (!IncrementalInline) {
3611 AlwaysIncrementalInline = false;
3612 }
3613 #endif
3614 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3615 // incremental inlining: bump MaxNodeLimit
3616 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3617 }
3618 #endif
3619
3620 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3621 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3622 DebugNonSafepoints = true;
3623 }
3624
3625 #ifndef PRODUCT
3626 if (CompileTheWorld) {
3627 // Force NmethodSweeper to sweep whole CodeCache each time.
3628 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3629 NmethodSweepFraction = 1;
3630 }
3631 }
3632 #endif
3633
3634 if (PrintCommandLineFlags) {
3635 CommandLineFlags::printSetFlags(tty);
3636 }
3637
3638 // Apply CPU specific policy for the BiasedLocking
3639 if (UseBiasedLocking) {
3640 if (!VM_Version::use_biased_locking() &&
3641 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3642 UseBiasedLocking = false;
3643 }
3644 }
3645
3646 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3647 // but only if not already set on the commandline
3648 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3649 bool set = false;
3650 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3651 if (!set) {
3652 FLAG_SET_DEFAULT(PauseAtExit, true);
3653 }
3654 }
3655
3656 return JNI_OK;
3657 }
3658
3659 jint Arguments::adjust_after_os() {
3660 #if INCLUDE_ALL_GCS
3661 if (UseParallelGC || UseParallelOldGC) {
3662 if (UseNUMA) {
3663 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3664 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3665 }
3666 // For those collectors or operating systems (eg, Windows) that do
3667 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3668 UseNUMAInterleaving = true;
3669 }
3670 }
3671 #endif // INCLUDE_ALL_GCS
3672 return JNI_OK;
3673 }
3674
3675 int Arguments::PropertyList_count(SystemProperty* pl) {
3676 int count = 0;
3677 while(pl != NULL) {
3678 count++;
3679 pl = pl->next();
3680 }
3681 return count;
3682 }
3683
3684 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3685 assert(key != NULL, "just checking");
3686 SystemProperty* prop;
3687 for (prop = pl; prop != NULL; prop = prop->next()) {
3688 if (strcmp(key, prop->key()) == 0) return prop->value();
3689 }
3690 return NULL;
3691 }
3692
3693 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3694 int count = 0;
3695 const char* ret_val = NULL;
3696
3697 while(pl != NULL) {
3698 if(count >= index) {
3699 ret_val = pl->key();
3700 break;
3701 }
3702 count++;
3703 pl = pl->next();
3704 }
3705
3706 return ret_val;
3707 }
3708
3709 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3710 int count = 0;
3711 char* ret_val = NULL;
3712
3713 while(pl != NULL) {
3714 if(count >= index) {
3715 ret_val = pl->value();
3716 break;
3717 }
3718 count++;
3719 pl = pl->next();
3720 }
3721
3722 return ret_val;
3723 }
3724
3725 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3726 SystemProperty* p = *plist;
3727 if (p == NULL) {
3728 *plist = new_p;
3729 } else {
3730 while (p->next() != NULL) {
3731 p = p->next();
3732 }
3733 p->set_next(new_p);
3734 }
3735 }
3736
3737 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3738 if (plist == NULL)
3739 return;
3740
3741 SystemProperty* new_p = new SystemProperty(k, v, true);
3742 PropertyList_add(plist, new_p);
3743 }
3744
3745 // This add maintains unique property key in the list.
3746 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3747 if (plist == NULL)
3748 return;
3749
3750 // If property key exist then update with new value.
3751 SystemProperty* prop;
3752 for (prop = *plist; prop != NULL; prop = prop->next()) {
3753 if (strcmp(k, prop->key()) == 0) {
3754 if (append) {
3755 prop->append_value(v);
3756 } else {
3757 prop->set_value(v);
3758 }
3759 return;
3760 }
3761 }
3762
3763 PropertyList_add(plist, k, v);
3764 }
3765
3766 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3767 // Returns true if all of the source pointed by src has been copied over to
3768 // the destination buffer pointed by buf. Otherwise, returns false.
3769 // Notes:
3770 // 1. If the length (buflen) of the destination buffer excluding the
3771 // NULL terminator character is not long enough for holding the expanded
3772 // pid characters, it also returns false instead of returning the partially
3773 // expanded one.
3774 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3775 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3776 char* buf, size_t buflen) {
3777 const char* p = src;
3778 char* b = buf;
3779 const char* src_end = &src[srclen];
3780 char* buf_end = &buf[buflen - 1];
3781
3782 while (p < src_end && b < buf_end) {
3783 if (*p == '%') {
3784 switch (*(++p)) {
3785 case '%': // "%%" ==> "%"
3786 *b++ = *p++;
3787 break;
3788 case 'p': { // "%p" ==> current process id
3789 // buf_end points to the character before the last character so
3790 // that we could write '\0' to the end of the buffer.
3791 size_t buf_sz = buf_end - b + 1;
3792 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3793
3794 // if jio_snprintf fails or the buffer is not long enough to hold
3795 // the expanded pid, returns false.
3796 if (ret < 0 || ret >= (int)buf_sz) {
3797 return false;
3798 } else {
3799 b += ret;
3800 assert(*b == '\0', "fail in copy_expand_pid");
3801 if (p == src_end && b == buf_end + 1) {
3802 // reach the end of the buffer.
3803 return true;
3804 }
3805 }
3806 p++;
3807 break;
3808 }
3809 default :
3810 *b++ = '%';
3811 }
3812 } else {
3813 *b++ = *p++;
3814 }
3815 }
3816 *b = '\0';
3817 return (p == src_end); // return false if not all of the source was copied
3818 }