Tue, 05 Nov 2013 17:38:04 -0800
Merge
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 */
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/genCollectedHeap.hpp"
32 #include "memory/referenceProcessor.hpp"
33 #include "memory/universe.inline.hpp"
34 #include "oops/oop.inline.hpp"
35 #include "prims/jvmtiExport.hpp"
36 #include "runtime/arguments.hpp"
37 #include "runtime/globals_extension.hpp"
38 #include "runtime/java.hpp"
39 #include "services/management.hpp"
40 #include "services/memTracker.hpp"
41 #include "utilities/defaultStream.hpp"
42 #include "utilities/macros.hpp"
43 #include "utilities/taskqueue.hpp"
44 #ifdef TARGET_OS_FAMILY_linux
45 # include "os_linux.inline.hpp"
46 #endif
47 #ifdef TARGET_OS_FAMILY_solaris
48 # include "os_solaris.inline.hpp"
49 #endif
50 #ifdef TARGET_OS_FAMILY_windows
51 # include "os_windows.inline.hpp"
52 #endif
53 #ifdef TARGET_OS_FAMILY_aix
54 # include "os_aix.inline.hpp"
55 #endif
56 #ifdef TARGET_OS_FAMILY_bsd
57 # include "os_bsd.inline.hpp"
58 #endif
59 #if INCLUDE_ALL_GCS
60 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
61 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
62 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
63 #endif // INCLUDE_ALL_GCS
65 // Note: This is a special bug reporting site for the JVM
66 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
67 #define DEFAULT_JAVA_LAUNCHER "generic"
69 // Disable options not supported in this release, with a warning if they
70 // were explicitly requested on the command-line
71 #define UNSUPPORTED_OPTION(opt, description) \
72 do { \
73 if (opt) { \
74 if (FLAG_IS_CMDLINE(opt)) { \
75 warning(description " is disabled in this release."); \
76 } \
77 FLAG_SET_DEFAULT(opt, false); \
78 } \
79 } while(0)
81 #define UNSUPPORTED_GC_OPTION(gc) \
82 do { \
83 if (gc) { \
84 if (FLAG_IS_CMDLINE(gc)) { \
85 warning(#gc " is not supported in this VM. Using Serial GC."); \
86 } \
87 FLAG_SET_DEFAULT(gc, false); \
88 } \
89 } while(0)
91 char** Arguments::_jvm_flags_array = NULL;
92 int Arguments::_num_jvm_flags = 0;
93 char** Arguments::_jvm_args_array = NULL;
94 int Arguments::_num_jvm_args = 0;
95 char* Arguments::_java_command = NULL;
96 SystemProperty* Arguments::_system_properties = NULL;
97 const char* Arguments::_gc_log_filename = NULL;
98 bool Arguments::_has_profile = false;
99 size_t Arguments::_conservative_max_heap_alignment = 0;
100 uintx Arguments::_min_heap_size = 0;
101 Arguments::Mode Arguments::_mode = _mixed;
102 bool Arguments::_java_compiler = false;
103 bool Arguments::_xdebug_mode = false;
104 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
105 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
106 int Arguments::_sun_java_launcher_pid = -1;
107 bool Arguments::_created_by_gamma_launcher = false;
109 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
110 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
111 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
112 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
113 bool Arguments::_ClipInlining = ClipInlining;
115 char* Arguments::SharedArchivePath = NULL;
117 AgentLibraryList Arguments::_libraryList;
118 AgentLibraryList Arguments::_agentList;
120 abort_hook_t Arguments::_abort_hook = NULL;
121 exit_hook_t Arguments::_exit_hook = NULL;
122 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
125 SystemProperty *Arguments::_java_ext_dirs = NULL;
126 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
127 SystemProperty *Arguments::_sun_boot_library_path = NULL;
128 SystemProperty *Arguments::_java_library_path = NULL;
129 SystemProperty *Arguments::_java_home = NULL;
130 SystemProperty *Arguments::_java_class_path = NULL;
131 SystemProperty *Arguments::_sun_boot_class_path = NULL;
133 char* Arguments::_meta_index_path = NULL;
134 char* Arguments::_meta_index_dir = NULL;
136 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
138 static bool match_option(const JavaVMOption *option, const char* name,
139 const char** tail) {
140 int len = (int)strlen(name);
141 if (strncmp(option->optionString, name, len) == 0) {
142 *tail = option->optionString + len;
143 return true;
144 } else {
145 return false;
146 }
147 }
149 static void logOption(const char* opt) {
150 if (PrintVMOptions) {
151 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
152 }
153 }
155 // Process java launcher properties.
156 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
157 // See if sun.java.launcher or sun.java.launcher.pid is defined.
158 // Must do this before setting up other system properties,
159 // as some of them may depend on launcher type.
160 for (int index = 0; index < args->nOptions; index++) {
161 const JavaVMOption* option = args->options + index;
162 const char* tail;
164 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
165 process_java_launcher_argument(tail, option->extraInfo);
166 continue;
167 }
168 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
169 _sun_java_launcher_pid = atoi(tail);
170 continue;
171 }
172 }
173 }
175 // Initialize system properties key and value.
176 void Arguments::init_system_properties() {
178 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
179 "Java Virtual Machine Specification", false));
180 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
181 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
182 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
184 // following are JVMTI agent writeable properties.
185 // Properties values are set to NULL and they are
186 // os specific they are initialized in os::init_system_properties_values().
187 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
188 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
189 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
190 _java_library_path = new SystemProperty("java.library.path", NULL, true);
191 _java_home = new SystemProperty("java.home", NULL, true);
192 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
194 _java_class_path = new SystemProperty("java.class.path", "", true);
196 // Add to System Property list.
197 PropertyList_add(&_system_properties, _java_ext_dirs);
198 PropertyList_add(&_system_properties, _java_endorsed_dirs);
199 PropertyList_add(&_system_properties, _sun_boot_library_path);
200 PropertyList_add(&_system_properties, _java_library_path);
201 PropertyList_add(&_system_properties, _java_home);
202 PropertyList_add(&_system_properties, _java_class_path);
203 PropertyList_add(&_system_properties, _sun_boot_class_path);
205 // Set OS specific system properties values
206 os::init_system_properties_values();
207 }
210 // Update/Initialize System properties after JDK version number is known
211 void Arguments::init_version_specific_system_properties() {
212 enum { bufsz = 16 };
213 char buffer[bufsz];
214 const char* spec_vendor = "Sun Microsystems Inc.";
215 uint32_t spec_version = 0;
217 if (JDK_Version::is_gte_jdk17x_version()) {
218 spec_vendor = "Oracle Corporation";
219 spec_version = JDK_Version::current().major_version();
220 }
221 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
223 PropertyList_add(&_system_properties,
224 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
225 PropertyList_add(&_system_properties,
226 new SystemProperty("java.vm.specification.version", buffer, false));
227 PropertyList_add(&_system_properties,
228 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
229 }
231 /**
232 * Provide a slightly more user-friendly way of eliminating -XX flags.
233 * When a flag is eliminated, it can be added to this list in order to
234 * continue accepting this flag on the command-line, while issuing a warning
235 * and ignoring the value. Once the JDK version reaches the 'accept_until'
236 * limit, we flatly refuse to admit the existence of the flag. This allows
237 * a flag to die correctly over JDK releases using HSX.
238 */
239 typedef struct {
240 const char* name;
241 JDK_Version obsoleted_in; // when the flag went away
242 JDK_Version accept_until; // which version to start denying the existence
243 } ObsoleteFlag;
245 static ObsoleteFlag obsolete_jvm_flags[] = {
246 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
247 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
248 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
249 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
250 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
251 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
252 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
253 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
254 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
255 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
256 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
257 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
258 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
259 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
260 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
261 { "DefaultInitialRAMFraction",
262 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
263 { "UseDepthFirstScavengeOrder",
264 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
265 { "HandlePromotionFailure",
266 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
267 { "MaxLiveObjectEvacuationRatio",
268 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
269 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
270 { "UseParallelOldGCCompacting",
271 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
272 { "UseParallelDensePrefixUpdate",
273 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
274 { "UseParallelOldGCDensePrefix",
275 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
276 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
277 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
278 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
279 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
280 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
281 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
282 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
283 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
284 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
285 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
286 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
293 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
294 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
295 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
296 #ifdef PRODUCT
297 { "DesiredMethodLimit",
298 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
299 #endif // PRODUCT
300 { NULL, JDK_Version(0), JDK_Version(0) }
301 };
303 // Returns true if the flag is obsolete and fits into the range specified
304 // for being ignored. In the case that the flag is ignored, the 'version'
305 // value is filled in with the version number when the flag became
306 // obsolete so that that value can be displayed to the user.
307 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
308 int i = 0;
309 assert(version != NULL, "Must provide a version buffer");
310 while (obsolete_jvm_flags[i].name != NULL) {
311 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
312 // <flag>=xxx form
313 // [-|+]<flag> form
314 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
315 ((s[0] == '+' || s[0] == '-') &&
316 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
317 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
318 *version = flag_status.obsoleted_in;
319 return true;
320 }
321 }
322 i++;
323 }
324 return false;
325 }
327 // Constructs the system class path (aka boot class path) from the following
328 // components, in order:
329 //
330 // prefix // from -Xbootclasspath/p:...
331 // endorsed // the expansion of -Djava.endorsed.dirs=...
332 // base // from os::get_system_properties() or -Xbootclasspath=
333 // suffix // from -Xbootclasspath/a:...
334 //
335 // java.endorsed.dirs is a list of directories; any jar or zip files in the
336 // directories are added to the sysclasspath just before the base.
337 //
338 // This could be AllStatic, but it isn't needed after argument processing is
339 // complete.
340 class SysClassPath: public StackObj {
341 public:
342 SysClassPath(const char* base);
343 ~SysClassPath();
345 inline void set_base(const char* base);
346 inline void add_prefix(const char* prefix);
347 inline void add_suffix_to_prefix(const char* suffix);
348 inline void add_suffix(const char* suffix);
349 inline void reset_path(const char* base);
351 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
352 // property. Must be called after all command-line arguments have been
353 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
354 // combined_path().
355 void expand_endorsed();
357 inline const char* get_base() const { return _items[_scp_base]; }
358 inline const char* get_prefix() const { return _items[_scp_prefix]; }
359 inline const char* get_suffix() const { return _items[_scp_suffix]; }
360 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
362 // Combine all the components into a single c-heap-allocated string; caller
363 // must free the string if/when no longer needed.
364 char* combined_path();
366 private:
367 // Utility routines.
368 static char* add_to_path(const char* path, const char* str, bool prepend);
369 static char* add_jars_to_path(char* path, const char* directory);
371 inline void reset_item_at(int index);
373 // Array indices for the items that make up the sysclasspath. All except the
374 // base are allocated in the C heap and freed by this class.
375 enum {
376 _scp_prefix, // from -Xbootclasspath/p:...
377 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
378 _scp_base, // the default sysclasspath
379 _scp_suffix, // from -Xbootclasspath/a:...
380 _scp_nitems // the number of items, must be last.
381 };
383 const char* _items[_scp_nitems];
384 DEBUG_ONLY(bool _expansion_done;)
385 };
387 SysClassPath::SysClassPath(const char* base) {
388 memset(_items, 0, sizeof(_items));
389 _items[_scp_base] = base;
390 DEBUG_ONLY(_expansion_done = false;)
391 }
393 SysClassPath::~SysClassPath() {
394 // Free everything except the base.
395 for (int i = 0; i < _scp_nitems; ++i) {
396 if (i != _scp_base) reset_item_at(i);
397 }
398 DEBUG_ONLY(_expansion_done = false;)
399 }
401 inline void SysClassPath::set_base(const char* base) {
402 _items[_scp_base] = base;
403 }
405 inline void SysClassPath::add_prefix(const char* prefix) {
406 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
407 }
409 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
410 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
411 }
413 inline void SysClassPath::add_suffix(const char* suffix) {
414 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
415 }
417 inline void SysClassPath::reset_item_at(int index) {
418 assert(index < _scp_nitems && index != _scp_base, "just checking");
419 if (_items[index] != NULL) {
420 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
421 _items[index] = NULL;
422 }
423 }
425 inline void SysClassPath::reset_path(const char* base) {
426 // Clear the prefix and suffix.
427 reset_item_at(_scp_prefix);
428 reset_item_at(_scp_suffix);
429 set_base(base);
430 }
432 //------------------------------------------------------------------------------
434 void SysClassPath::expand_endorsed() {
435 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
437 const char* path = Arguments::get_property("java.endorsed.dirs");
438 if (path == NULL) {
439 path = Arguments::get_endorsed_dir();
440 assert(path != NULL, "no default for java.endorsed.dirs");
441 }
443 char* expanded_path = NULL;
444 const char separator = *os::path_separator();
445 const char* const end = path + strlen(path);
446 while (path < end) {
447 const char* tmp_end = strchr(path, separator);
448 if (tmp_end == NULL) {
449 expanded_path = add_jars_to_path(expanded_path, path);
450 path = end;
451 } else {
452 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
453 memcpy(dirpath, path, tmp_end - path);
454 dirpath[tmp_end - path] = '\0';
455 expanded_path = add_jars_to_path(expanded_path, dirpath);
456 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
457 path = tmp_end + 1;
458 }
459 }
460 _items[_scp_endorsed] = expanded_path;
461 DEBUG_ONLY(_expansion_done = true;)
462 }
464 // Combine the bootclasspath elements, some of which may be null, into a single
465 // c-heap-allocated string.
466 char* SysClassPath::combined_path() {
467 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
468 assert(_expansion_done, "must call expand_endorsed() first.");
470 size_t lengths[_scp_nitems];
471 size_t total_len = 0;
473 const char separator = *os::path_separator();
475 // Get the lengths.
476 int i;
477 for (i = 0; i < _scp_nitems; ++i) {
478 if (_items[i] != NULL) {
479 lengths[i] = strlen(_items[i]);
480 // Include space for the separator char (or a NULL for the last item).
481 total_len += lengths[i] + 1;
482 }
483 }
484 assert(total_len > 0, "empty sysclasspath not allowed");
486 // Copy the _items to a single string.
487 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
488 char* cp_tmp = cp;
489 for (i = 0; i < _scp_nitems; ++i) {
490 if (_items[i] != NULL) {
491 memcpy(cp_tmp, _items[i], lengths[i]);
492 cp_tmp += lengths[i];
493 *cp_tmp++ = separator;
494 }
495 }
496 *--cp_tmp = '\0'; // Replace the extra separator.
497 return cp;
498 }
500 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
501 char*
502 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
503 char *cp;
505 assert(str != NULL, "just checking");
506 if (path == NULL) {
507 size_t len = strlen(str) + 1;
508 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
509 memcpy(cp, str, len); // copy the trailing null
510 } else {
511 const char separator = *os::path_separator();
512 size_t old_len = strlen(path);
513 size_t str_len = strlen(str);
514 size_t len = old_len + str_len + 2;
516 if (prepend) {
517 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
518 char* cp_tmp = cp;
519 memcpy(cp_tmp, str, str_len);
520 cp_tmp += str_len;
521 *cp_tmp = separator;
522 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
523 FREE_C_HEAP_ARRAY(char, path, mtInternal);
524 } else {
525 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
526 char* cp_tmp = cp + old_len;
527 *cp_tmp = separator;
528 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
529 }
530 }
531 return cp;
532 }
534 // Scan the directory and append any jar or zip files found to path.
535 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
536 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
537 DIR* dir = os::opendir(directory);
538 if (dir == NULL) return path;
540 char dir_sep[2] = { '\0', '\0' };
541 size_t directory_len = strlen(directory);
542 const char fileSep = *os::file_separator();
543 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
545 /* Scan the directory for jars/zips, appending them to path. */
546 struct dirent *entry;
547 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
548 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
549 const char* name = entry->d_name;
550 const char* ext = name + strlen(name) - 4;
551 bool isJarOrZip = ext > name &&
552 (os::file_name_strcmp(ext, ".jar") == 0 ||
553 os::file_name_strcmp(ext, ".zip") == 0);
554 if (isJarOrZip) {
555 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
556 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
557 path = add_to_path(path, jarpath, false);
558 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
559 }
560 }
561 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
562 os::closedir(dir);
563 return path;
564 }
566 // Parses a memory size specification string.
567 static bool atomull(const char *s, julong* result) {
568 julong n = 0;
569 int args_read = sscanf(s, JULONG_FORMAT, &n);
570 if (args_read != 1) {
571 return false;
572 }
573 while (*s != '\0' && isdigit(*s)) {
574 s++;
575 }
576 // 4705540: illegal if more characters are found after the first non-digit
577 if (strlen(s) > 1) {
578 return false;
579 }
580 switch (*s) {
581 case 'T': case 't':
582 *result = n * G * K;
583 // Check for overflow.
584 if (*result/((julong)G * K) != n) return false;
585 return true;
586 case 'G': case 'g':
587 *result = n * G;
588 if (*result/G != n) return false;
589 return true;
590 case 'M': case 'm':
591 *result = n * M;
592 if (*result/M != n) return false;
593 return true;
594 case 'K': case 'k':
595 *result = n * K;
596 if (*result/K != n) return false;
597 return true;
598 case '\0':
599 *result = n;
600 return true;
601 default:
602 return false;
603 }
604 }
606 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
607 if (size < min_size) return arg_too_small;
608 // Check that size will fit in a size_t (only relevant on 32-bit)
609 if (size > max_uintx) return arg_too_big;
610 return arg_in_range;
611 }
613 // Describe an argument out of range error
614 void Arguments::describe_range_error(ArgsRange errcode) {
615 switch(errcode) {
616 case arg_too_big:
617 jio_fprintf(defaultStream::error_stream(),
618 "The specified size exceeds the maximum "
619 "representable size.\n");
620 break;
621 case arg_too_small:
622 case arg_unreadable:
623 case arg_in_range:
624 // do nothing for now
625 break;
626 default:
627 ShouldNotReachHere();
628 }
629 }
631 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
632 return CommandLineFlags::boolAtPut(name, &value, origin);
633 }
635 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
636 double v;
637 if (sscanf(value, "%lf", &v) != 1) {
638 return false;
639 }
641 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
642 return true;
643 }
644 return false;
645 }
647 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
648 julong v;
649 intx intx_v;
650 bool is_neg = false;
651 // Check the sign first since atomull() parses only unsigned values.
652 if (*value == '-') {
653 if (!CommandLineFlags::intxAt(name, &intx_v)) {
654 return false;
655 }
656 value++;
657 is_neg = true;
658 }
659 if (!atomull(value, &v)) {
660 return false;
661 }
662 intx_v = (intx) v;
663 if (is_neg) {
664 intx_v = -intx_v;
665 }
666 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
667 return true;
668 }
669 uintx uintx_v = (uintx) v;
670 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
671 return true;
672 }
673 uint64_t uint64_t_v = (uint64_t) v;
674 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
675 return true;
676 }
677 return false;
678 }
680 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
681 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
682 // Contract: CommandLineFlags always returns a pointer that needs freeing.
683 FREE_C_HEAP_ARRAY(char, value, mtInternal);
684 return true;
685 }
687 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
688 const char* old_value = "";
689 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
690 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
691 size_t new_len = strlen(new_value);
692 const char* value;
693 char* free_this_too = NULL;
694 if (old_len == 0) {
695 value = new_value;
696 } else if (new_len == 0) {
697 value = old_value;
698 } else {
699 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
700 // each new setting adds another LINE to the switch:
701 sprintf(buf, "%s\n%s", old_value, new_value);
702 value = buf;
703 free_this_too = buf;
704 }
705 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
706 // CommandLineFlags always returns a pointer that needs freeing.
707 FREE_C_HEAP_ARRAY(char, value, mtInternal);
708 if (free_this_too != NULL) {
709 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
710 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
711 }
712 return true;
713 }
715 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
717 // range of acceptable characters spelled out for portability reasons
718 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
719 #define BUFLEN 255
720 char name[BUFLEN+1];
721 char dummy;
723 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
724 return set_bool_flag(name, false, origin);
725 }
726 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
727 return set_bool_flag(name, true, origin);
728 }
730 char punct;
731 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
732 const char* value = strchr(arg, '=') + 1;
733 Flag* flag = Flag::find_flag(name, strlen(name));
734 if (flag != NULL && flag->is_ccstr()) {
735 if (flag->ccstr_accumulates()) {
736 return append_to_string_flag(name, value, origin);
737 } else {
738 if (value[0] == '\0') {
739 value = NULL;
740 }
741 return set_string_flag(name, value, origin);
742 }
743 }
744 }
746 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
747 const char* value = strchr(arg, '=') + 1;
748 // -XX:Foo:=xxx will reset the string flag to the given value.
749 if (value[0] == '\0') {
750 value = NULL;
751 }
752 return set_string_flag(name, value, origin);
753 }
755 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
756 #define SIGNED_NUMBER_RANGE "[-0123456789]"
757 #define NUMBER_RANGE "[0123456789]"
758 char value[BUFLEN + 1];
759 char value2[BUFLEN + 1];
760 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
761 // Looks like a floating-point number -- try again with more lenient format string
762 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
763 return set_fp_numeric_flag(name, value, origin);
764 }
765 }
767 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
768 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
769 return set_numeric_flag(name, value, origin);
770 }
772 return false;
773 }
775 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
776 assert(bldarray != NULL, "illegal argument");
778 if (arg == NULL) {
779 return;
780 }
782 int new_count = *count + 1;
784 // expand the array and add arg to the last element
785 if (*bldarray == NULL) {
786 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
787 } else {
788 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
789 }
790 (*bldarray)[*count] = strdup(arg);
791 *count = new_count;
792 }
794 void Arguments::build_jvm_args(const char* arg) {
795 add_string(&_jvm_args_array, &_num_jvm_args, arg);
796 }
798 void Arguments::build_jvm_flags(const char* arg) {
799 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
800 }
802 // utility function to return a string that concatenates all
803 // strings in a given char** array
804 const char* Arguments::build_resource_string(char** args, int count) {
805 if (args == NULL || count == 0) {
806 return NULL;
807 }
808 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
809 for (int i = 1; i < count; i++) {
810 length += strlen(args[i]) + 1; // add 1 for a space
811 }
812 char* s = NEW_RESOURCE_ARRAY(char, length);
813 strcpy(s, args[0]);
814 for (int j = 1; j < count; j++) {
815 strcat(s, " ");
816 strcat(s, args[j]);
817 }
818 return (const char*) s;
819 }
821 void Arguments::print_on(outputStream* st) {
822 st->print_cr("VM Arguments:");
823 if (num_jvm_flags() > 0) {
824 st->print("jvm_flags: "); print_jvm_flags_on(st);
825 }
826 if (num_jvm_args() > 0) {
827 st->print("jvm_args: "); print_jvm_args_on(st);
828 }
829 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
830 if (_java_class_path != NULL) {
831 char* path = _java_class_path->value();
832 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
833 }
834 st->print_cr("Launcher Type: %s", _sun_java_launcher);
835 }
837 void Arguments::print_jvm_flags_on(outputStream* st) {
838 if (_num_jvm_flags > 0) {
839 for (int i=0; i < _num_jvm_flags; i++) {
840 st->print("%s ", _jvm_flags_array[i]);
841 }
842 st->print_cr("");
843 }
844 }
846 void Arguments::print_jvm_args_on(outputStream* st) {
847 if (_num_jvm_args > 0) {
848 for (int i=0; i < _num_jvm_args; i++) {
849 st->print("%s ", _jvm_args_array[i]);
850 }
851 st->print_cr("");
852 }
853 }
855 bool Arguments::process_argument(const char* arg,
856 jboolean ignore_unrecognized, Flag::Flags origin) {
858 JDK_Version since = JDK_Version();
860 if (parse_argument(arg, origin) || ignore_unrecognized) {
861 return true;
862 }
864 bool has_plus_minus = (*arg == '+' || *arg == '-');
865 const char* const argname = has_plus_minus ? arg + 1 : arg;
866 if (is_newly_obsolete(arg, &since)) {
867 char version[256];
868 since.to_string(version, sizeof(version));
869 warning("ignoring option %s; support was removed in %s", argname, version);
870 return true;
871 }
873 // For locked flags, report a custom error message if available.
874 // Otherwise, report the standard unrecognized VM option.
876 size_t arg_len;
877 const char* equal_sign = strchr(argname, '=');
878 if (equal_sign == NULL) {
879 arg_len = strlen(argname);
880 } else {
881 arg_len = equal_sign - argname;
882 }
884 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true);
885 if (found_flag != NULL) {
886 char locked_message_buf[BUFLEN];
887 found_flag->get_locked_message(locked_message_buf, BUFLEN);
888 if (strlen(locked_message_buf) == 0) {
889 if (found_flag->is_bool() && !has_plus_minus) {
890 jio_fprintf(defaultStream::error_stream(),
891 "Missing +/- setting for VM option '%s'\n", argname);
892 } else if (!found_flag->is_bool() && has_plus_minus) {
893 jio_fprintf(defaultStream::error_stream(),
894 "Unexpected +/- setting in VM option '%s'\n", argname);
895 } else {
896 jio_fprintf(defaultStream::error_stream(),
897 "Improperly specified VM option '%s'\n", argname);
898 }
899 } else {
900 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
901 }
902 } else {
903 jio_fprintf(defaultStream::error_stream(),
904 "Unrecognized VM option '%s'\n", argname);
905 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
906 if (fuzzy_matched != NULL) {
907 jio_fprintf(defaultStream::error_stream(),
908 "Did you mean '%s%s%s'?\n",
909 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
910 fuzzy_matched->_name,
911 (fuzzy_matched->is_bool()) ? "" : "=<value>");
912 }
913 }
915 // allow for commandline "commenting out" options like -XX:#+Verbose
916 return arg[0] == '#';
917 }
919 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
920 FILE* stream = fopen(file_name, "rb");
921 if (stream == NULL) {
922 if (should_exist) {
923 jio_fprintf(defaultStream::error_stream(),
924 "Could not open settings file %s\n", file_name);
925 return false;
926 } else {
927 return true;
928 }
929 }
931 char token[1024];
932 int pos = 0;
934 bool in_white_space = true;
935 bool in_comment = false;
936 bool in_quote = false;
937 char quote_c = 0;
938 bool result = true;
940 int c = getc(stream);
941 while(c != EOF && pos < (int)(sizeof(token)-1)) {
942 if (in_white_space) {
943 if (in_comment) {
944 if (c == '\n') in_comment = false;
945 } else {
946 if (c == '#') in_comment = true;
947 else if (!isspace(c)) {
948 in_white_space = false;
949 token[pos++] = c;
950 }
951 }
952 } else {
953 if (c == '\n' || (!in_quote && isspace(c))) {
954 // token ends at newline, or at unquoted whitespace
955 // this allows a way to include spaces in string-valued options
956 token[pos] = '\0';
957 logOption(token);
958 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
959 build_jvm_flags(token);
960 pos = 0;
961 in_white_space = true;
962 in_quote = false;
963 } else if (!in_quote && (c == '\'' || c == '"')) {
964 in_quote = true;
965 quote_c = c;
966 } else if (in_quote && (c == quote_c)) {
967 in_quote = false;
968 } else {
969 token[pos++] = c;
970 }
971 }
972 c = getc(stream);
973 }
974 if (pos > 0) {
975 token[pos] = '\0';
976 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
977 build_jvm_flags(token);
978 }
979 fclose(stream);
980 return result;
981 }
983 //=============================================================================================================
984 // Parsing of properties (-D)
986 const char* Arguments::get_property(const char* key) {
987 return PropertyList_get_value(system_properties(), key);
988 }
990 bool Arguments::add_property(const char* prop) {
991 const char* eq = strchr(prop, '=');
992 char* key;
993 // ns must be static--its address may be stored in a SystemProperty object.
994 const static char ns[1] = {0};
995 char* value = (char *)ns;
997 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
998 key = AllocateHeap(key_len + 1, mtInternal);
999 strncpy(key, prop, key_len);
1000 key[key_len] = '\0';
1002 if (eq != NULL) {
1003 size_t value_len = strlen(prop) - key_len - 1;
1004 value = AllocateHeap(value_len + 1, mtInternal);
1005 strncpy(value, &prop[key_len + 1], value_len + 1);
1006 }
1008 if (strcmp(key, "java.compiler") == 0) {
1009 process_java_compiler_argument(value);
1010 FreeHeap(key);
1011 if (eq != NULL) {
1012 FreeHeap(value);
1013 }
1014 return true;
1015 } else if (strcmp(key, "sun.java.command") == 0) {
1016 _java_command = value;
1018 // Record value in Arguments, but let it get passed to Java.
1019 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1020 // launcher.pid property is private and is processed
1021 // in process_sun_java_launcher_properties();
1022 // the sun.java.launcher property is passed on to the java application
1023 FreeHeap(key);
1024 if (eq != NULL) {
1025 FreeHeap(value);
1026 }
1027 return true;
1028 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1029 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1030 // its value without going through the property list or making a Java call.
1031 _java_vendor_url_bug = value;
1032 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1033 PropertyList_unique_add(&_system_properties, key, value, true);
1034 return true;
1035 }
1036 // Create new property and add at the end of the list
1037 PropertyList_unique_add(&_system_properties, key, value);
1038 return true;
1039 }
1041 //===========================================================================================================
1042 // Setting int/mixed/comp mode flags
1044 void Arguments::set_mode_flags(Mode mode) {
1045 // Set up default values for all flags.
1046 // If you add a flag to any of the branches below,
1047 // add a default value for it here.
1048 set_java_compiler(false);
1049 _mode = mode;
1051 // Ensure Agent_OnLoad has the correct initial values.
1052 // This may not be the final mode; mode may change later in onload phase.
1053 PropertyList_unique_add(&_system_properties, "java.vm.info",
1054 (char*)VM_Version::vm_info_string(), false);
1056 UseInterpreter = true;
1057 UseCompiler = true;
1058 UseLoopCounter = true;
1060 #ifndef ZERO
1061 // Turn these off for mixed and comp. Leave them on for Zero.
1062 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1063 UseFastAccessorMethods = (mode == _int);
1064 }
1065 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1066 UseFastEmptyMethods = (mode == _int);
1067 }
1068 #endif
1070 // Default values may be platform/compiler dependent -
1071 // use the saved values
1072 ClipInlining = Arguments::_ClipInlining;
1073 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1074 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1075 BackgroundCompilation = Arguments::_BackgroundCompilation;
1077 // Change from defaults based on mode
1078 switch (mode) {
1079 default:
1080 ShouldNotReachHere();
1081 break;
1082 case _int:
1083 UseCompiler = false;
1084 UseLoopCounter = false;
1085 AlwaysCompileLoopMethods = false;
1086 UseOnStackReplacement = false;
1087 break;
1088 case _mixed:
1089 // same as default
1090 break;
1091 case _comp:
1092 UseInterpreter = false;
1093 BackgroundCompilation = false;
1094 ClipInlining = false;
1095 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1096 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1097 // compile a level 4 (C2) and then continue executing it.
1098 if (TieredCompilation) {
1099 Tier3InvokeNotifyFreqLog = 0;
1100 Tier4InvocationThreshold = 0;
1101 }
1102 break;
1103 }
1104 }
1106 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1107 // Conflict: required to use shared spaces (-Xshare:on), but
1108 // incompatible command line options were chosen.
1110 static void no_shared_spaces() {
1111 if (RequireSharedSpaces) {
1112 jio_fprintf(defaultStream::error_stream(),
1113 "Class data sharing is inconsistent with other specified options.\n");
1114 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1115 } else {
1116 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1117 }
1118 }
1119 #endif
1121 void Arguments::set_tiered_flags() {
1122 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1123 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1124 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1125 }
1126 if (CompilationPolicyChoice < 2) {
1127 vm_exit_during_initialization(
1128 "Incompatible compilation policy selected", NULL);
1129 }
1130 // Increase the code cache size - tiered compiles a lot more.
1131 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1132 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1133 }
1134 if (!UseInterpreter) { // -Xcomp
1135 Tier3InvokeNotifyFreqLog = 0;
1136 Tier4InvocationThreshold = 0;
1137 }
1138 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
1139 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
1140 }
1141 }
1143 #if INCLUDE_ALL_GCS
1144 static void disable_adaptive_size_policy(const char* collector_name) {
1145 if (UseAdaptiveSizePolicy) {
1146 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1147 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1148 collector_name);
1149 }
1150 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1151 }
1152 }
1154 void Arguments::set_parnew_gc_flags() {
1155 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1156 "control point invariant");
1157 assert(UseParNewGC, "Error");
1159 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1160 disable_adaptive_size_policy("UseParNewGC");
1162 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1163 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1164 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1165 } else if (ParallelGCThreads == 0) {
1166 jio_fprintf(defaultStream::error_stream(),
1167 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1168 vm_exit(1);
1169 }
1171 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1172 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1173 // we set them to 1024 and 1024.
1174 // See CR 6362902.
1175 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1176 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1177 }
1178 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1179 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1180 }
1182 // AlwaysTenure flag should make ParNew promote all at first collection.
1183 // See CR 6362902.
1184 if (AlwaysTenure) {
1185 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1186 }
1187 // When using compressed oops, we use local overflow stacks,
1188 // rather than using a global overflow list chained through
1189 // the klass word of the object's pre-image.
1190 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1191 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1192 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1193 }
1194 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1195 }
1196 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1197 }
1199 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1200 // sparc/solaris for certain applications, but would gain from
1201 // further optimization and tuning efforts, and would almost
1202 // certainly gain from analysis of platform and environment.
1203 void Arguments::set_cms_and_parnew_gc_flags() {
1204 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1205 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1207 // If we are using CMS, we prefer to UseParNewGC,
1208 // unless explicitly forbidden.
1209 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1210 FLAG_SET_ERGO(bool, UseParNewGC, true);
1211 }
1213 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1214 disable_adaptive_size_policy("UseConcMarkSweepGC");
1216 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1217 // as needed.
1218 if (UseParNewGC) {
1219 set_parnew_gc_flags();
1220 }
1222 size_t max_heap = align_size_down(MaxHeapSize,
1223 CardTableRS::ct_max_alignment_constraint());
1225 // Now make adjustments for CMS
1226 intx tenuring_default = (intx)6;
1227 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1229 // Preferred young gen size for "short" pauses:
1230 // upper bound depends on # of threads and NewRatio.
1231 const uintx parallel_gc_threads =
1232 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1233 const size_t preferred_max_new_size_unaligned =
1234 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1235 size_t preferred_max_new_size =
1236 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1238 // Unless explicitly requested otherwise, size young gen
1239 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1241 // If either MaxNewSize or NewRatio is set on the command line,
1242 // assume the user is trying to set the size of the young gen.
1243 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1245 // Set MaxNewSize to our calculated preferred_max_new_size unless
1246 // NewSize was set on the command line and it is larger than
1247 // preferred_max_new_size.
1248 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1249 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1250 } else {
1251 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1252 }
1253 if (PrintGCDetails && Verbose) {
1254 // Too early to use gclog_or_tty
1255 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1256 }
1258 // Code along this path potentially sets NewSize and OldSize
1259 if (PrintGCDetails && Verbose) {
1260 // Too early to use gclog_or_tty
1261 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1262 " initial_heap_size: " SIZE_FORMAT
1263 " max_heap: " SIZE_FORMAT,
1264 min_heap_size(), InitialHeapSize, max_heap);
1265 }
1266 size_t min_new = preferred_max_new_size;
1267 if (FLAG_IS_CMDLINE(NewSize)) {
1268 min_new = NewSize;
1269 }
1270 if (max_heap > min_new && min_heap_size() > min_new) {
1271 // Unless explicitly requested otherwise, make young gen
1272 // at least min_new, and at most preferred_max_new_size.
1273 if (FLAG_IS_DEFAULT(NewSize)) {
1274 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1275 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1276 if (PrintGCDetails && Verbose) {
1277 // Too early to use gclog_or_tty
1278 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1279 }
1280 }
1281 // Unless explicitly requested otherwise, size old gen
1282 // so it's NewRatio x of NewSize.
1283 if (FLAG_IS_DEFAULT(OldSize)) {
1284 if (max_heap > NewSize) {
1285 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1286 if (PrintGCDetails && Verbose) {
1287 // Too early to use gclog_or_tty
1288 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1289 }
1290 }
1291 }
1292 }
1293 }
1294 // Unless explicitly requested otherwise, definitely
1295 // promote all objects surviving "tenuring_default" scavenges.
1296 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1297 FLAG_IS_DEFAULT(SurvivorRatio)) {
1298 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1299 }
1300 // If we decided above (or user explicitly requested)
1301 // `promote all' (via MaxTenuringThreshold := 0),
1302 // prefer minuscule survivor spaces so as not to waste
1303 // space for (non-existent) survivors
1304 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1305 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1306 }
1307 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1308 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1309 // This is done in order to make ParNew+CMS configuration to work
1310 // with YoungPLABSize and OldPLABSize options.
1311 // See CR 6362902.
1312 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1313 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1314 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1315 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1316 // the value (either from the command line or ergonomics) of
1317 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1318 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1319 } else {
1320 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1321 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1322 // we'll let it to take precedence.
1323 jio_fprintf(defaultStream::error_stream(),
1324 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1325 " options are specified for the CMS collector."
1326 " CMSParPromoteBlocksToClaim will take precedence.\n");
1327 }
1328 }
1329 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1330 // OldPLAB sizing manually turned off: Use a larger default setting,
1331 // unless it was manually specified. This is because a too-low value
1332 // will slow down scavenges.
1333 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1334 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1335 }
1336 }
1337 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1338 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1339 // If either of the static initialization defaults have changed, note this
1340 // modification.
1341 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1342 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1343 }
1344 if (PrintGCDetails && Verbose) {
1345 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1346 MarkStackSize / K, MarkStackSizeMax / K);
1347 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1348 }
1349 }
1350 #endif // INCLUDE_ALL_GCS
1352 void set_object_alignment() {
1353 // Object alignment.
1354 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1355 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1356 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1357 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1358 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1359 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1361 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1362 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1364 // Oop encoding heap max
1365 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1367 #if INCLUDE_ALL_GCS
1368 // Set CMS global values
1369 CompactibleFreeListSpace::set_cms_values();
1370 #endif // INCLUDE_ALL_GCS
1371 }
1373 bool verify_object_alignment() {
1374 // Object alignment.
1375 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1376 jio_fprintf(defaultStream::error_stream(),
1377 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1378 (int)ObjectAlignmentInBytes);
1379 return false;
1380 }
1381 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1382 jio_fprintf(defaultStream::error_stream(),
1383 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1384 (int)ObjectAlignmentInBytes, BytesPerLong);
1385 return false;
1386 }
1387 // It does not make sense to have big object alignment
1388 // since a space lost due to alignment will be greater
1389 // then a saved space from compressed oops.
1390 if ((int)ObjectAlignmentInBytes > 256) {
1391 jio_fprintf(defaultStream::error_stream(),
1392 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1393 (int)ObjectAlignmentInBytes);
1394 return false;
1395 }
1396 // In case page size is very small.
1397 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1398 jio_fprintf(defaultStream::error_stream(),
1399 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1400 (int)ObjectAlignmentInBytes, os::vm_page_size());
1401 return false;
1402 }
1403 return true;
1404 }
1406 uintx Arguments::max_heap_for_compressed_oops() {
1407 // Avoid sign flip.
1408 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1409 // We need to fit both the NULL page and the heap into the memory budget, while
1410 // keeping alignment constraints of the heap. To guarantee the latter, as the
1411 // NULL page is located before the heap, we pad the NULL page to the conservative
1412 // maximum alignment that the GC may ever impose upon the heap.
1413 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1414 Arguments::conservative_max_heap_alignment());
1416 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1417 NOT_LP64(ShouldNotReachHere(); return 0);
1418 }
1420 bool Arguments::should_auto_select_low_pause_collector() {
1421 if (UseAutoGCSelectPolicy &&
1422 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1423 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1424 if (PrintGCDetails) {
1425 // Cannot use gclog_or_tty yet.
1426 tty->print_cr("Automatic selection of the low pause collector"
1427 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1428 }
1429 return true;
1430 }
1431 return false;
1432 }
1434 void Arguments::set_use_compressed_oops() {
1435 #ifndef ZERO
1436 #ifdef _LP64
1437 // MaxHeapSize is not set up properly at this point, but
1438 // the only value that can override MaxHeapSize if we are
1439 // to use UseCompressedOops is InitialHeapSize.
1440 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1442 if (max_heap_size <= max_heap_for_compressed_oops()) {
1443 #if !defined(COMPILER1) || defined(TIERED)
1444 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1445 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1446 }
1447 #endif
1448 #ifdef _WIN64
1449 if (UseLargePages && UseCompressedOops) {
1450 // Cannot allocate guard pages for implicit checks in indexed addressing
1451 // mode, when large pages are specified on windows.
1452 // This flag could be switched ON if narrow oop base address is set to 0,
1453 // see code in Universe::initialize_heap().
1454 Universe::set_narrow_oop_use_implicit_null_checks(false);
1455 }
1456 #endif // _WIN64
1457 } else {
1458 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1459 warning("Max heap size too large for Compressed Oops");
1460 FLAG_SET_DEFAULT(UseCompressedOops, false);
1461 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1462 }
1463 }
1464 #endif // _LP64
1465 #endif // ZERO
1466 }
1469 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1470 // set_use_compressed_oops().
1471 void Arguments::set_use_compressed_klass_ptrs() {
1472 #ifndef ZERO
1473 #ifdef _LP64
1474 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1475 if (!UseCompressedOops) {
1476 if (UseCompressedClassPointers) {
1477 warning("UseCompressedClassPointers requires UseCompressedOops");
1478 }
1479 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1480 } else {
1481 // Turn on UseCompressedClassPointers too
1482 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1483 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1484 }
1485 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1486 if (UseCompressedClassPointers) {
1487 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1488 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1489 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1490 }
1491 }
1492 }
1493 #endif // _LP64
1494 #endif // !ZERO
1495 }
1497 void Arguments::set_conservative_max_heap_alignment() {
1498 // The conservative maximum required alignment for the heap is the maximum of
1499 // the alignments imposed by several sources: any requirements from the heap
1500 // itself, the collector policy and the maximum page size we may run the VM
1501 // with.
1502 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1503 #if INCLUDE_ALL_GCS
1504 if (UseParallelGC) {
1505 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1506 } else if (UseG1GC) {
1507 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1508 }
1509 #endif // INCLUDE_ALL_GCS
1510 _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(),
1511 CollectorPolicy::compute_max_alignment());
1512 }
1514 void Arguments::set_ergonomics_flags() {
1516 if (os::is_server_class_machine()) {
1517 // If no other collector is requested explicitly,
1518 // let the VM select the collector based on
1519 // machine class and automatic selection policy.
1520 if (!UseSerialGC &&
1521 !UseConcMarkSweepGC &&
1522 !UseG1GC &&
1523 !UseParNewGC &&
1524 FLAG_IS_DEFAULT(UseParallelGC)) {
1525 if (should_auto_select_low_pause_collector()) {
1526 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1527 } else {
1528 FLAG_SET_ERGO(bool, UseParallelGC, true);
1529 }
1530 }
1531 }
1532 #ifdef COMPILER2
1533 // Shared spaces work fine with other GCs but causes bytecode rewriting
1534 // to be disabled, which hurts interpreter performance and decreases
1535 // server performance. When -server is specified, keep the default off
1536 // unless it is asked for. Future work: either add bytecode rewriting
1537 // at link time, or rewrite bytecodes in non-shared methods.
1538 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1539 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1540 no_shared_spaces();
1541 }
1542 #endif
1544 set_conservative_max_heap_alignment();
1546 #ifndef ZERO
1547 #ifdef _LP64
1548 set_use_compressed_oops();
1550 // set_use_compressed_klass_ptrs() must be called after calling
1551 // set_use_compressed_oops().
1552 set_use_compressed_klass_ptrs();
1554 // Also checks that certain machines are slower with compressed oops
1555 // in vm_version initialization code.
1556 #endif // _LP64
1557 #endif // !ZERO
1558 }
1560 void Arguments::set_parallel_gc_flags() {
1561 assert(UseParallelGC || UseParallelOldGC, "Error");
1562 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1563 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1564 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1565 }
1566 FLAG_SET_DEFAULT(UseParallelGC, true);
1568 // If no heap maximum was requested explicitly, use some reasonable fraction
1569 // of the physical memory, up to a maximum of 1GB.
1570 FLAG_SET_DEFAULT(ParallelGCThreads,
1571 Abstract_VM_Version::parallel_worker_threads());
1572 if (ParallelGCThreads == 0) {
1573 jio_fprintf(defaultStream::error_stream(),
1574 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1575 vm_exit(1);
1576 }
1579 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1580 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1581 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1582 // See CR 6362902 for details.
1583 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1584 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1585 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1586 }
1587 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1588 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1589 }
1590 }
1592 if (UseParallelOldGC) {
1593 // Par compact uses lower default values since they are treated as
1594 // minimums. These are different defaults because of the different
1595 // interpretation and are not ergonomically set.
1596 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1597 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1598 }
1599 }
1600 }
1602 void Arguments::set_g1_gc_flags() {
1603 assert(UseG1GC, "Error");
1604 #ifdef COMPILER1
1605 FastTLABRefill = false;
1606 #endif
1607 FLAG_SET_DEFAULT(ParallelGCThreads,
1608 Abstract_VM_Version::parallel_worker_threads());
1609 if (ParallelGCThreads == 0) {
1610 FLAG_SET_DEFAULT(ParallelGCThreads,
1611 Abstract_VM_Version::parallel_worker_threads());
1612 }
1614 // MarkStackSize will be set (if it hasn't been set by the user)
1615 // when concurrent marking is initialized.
1616 // Its value will be based upon the number of parallel marking threads.
1617 // But we do set the maximum mark stack size here.
1618 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1619 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1620 }
1622 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1623 // In G1, we want the default GC overhead goal to be higher than
1624 // say in PS. So we set it here to 10%. Otherwise the heap might
1625 // be expanded more aggressively than we would like it to. In
1626 // fact, even 10% seems to not be high enough in some cases
1627 // (especially small GC stress tests that the main thing they do
1628 // is allocation). We might consider increase it further.
1629 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1630 }
1632 if (PrintGCDetails && Verbose) {
1633 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1634 MarkStackSize / K, MarkStackSizeMax / K);
1635 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1636 }
1637 }
1639 julong Arguments::limit_by_allocatable_memory(julong limit) {
1640 julong max_allocatable;
1641 julong result = limit;
1642 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1643 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1644 }
1645 return result;
1646 }
1648 void Arguments::set_heap_size() {
1649 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1650 // Deprecated flag
1651 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1652 }
1654 const julong phys_mem =
1655 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1656 : (julong)MaxRAM;
1658 // If the maximum heap size has not been set with -Xmx,
1659 // then set it as fraction of the size of physical memory,
1660 // respecting the maximum and minimum sizes of the heap.
1661 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1662 julong reasonable_max = phys_mem / MaxRAMFraction;
1664 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1665 // Small physical memory, so use a minimum fraction of it for the heap
1666 reasonable_max = phys_mem / MinRAMFraction;
1667 } else {
1668 // Not-small physical memory, so require a heap at least
1669 // as large as MaxHeapSize
1670 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1671 }
1672 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1673 // Limit the heap size to ErgoHeapSizeLimit
1674 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1675 }
1676 if (UseCompressedOops) {
1677 // Limit the heap size to the maximum possible when using compressed oops
1678 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1679 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1680 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1681 // but it should be not less than default MaxHeapSize.
1682 max_coop_heap -= HeapBaseMinAddress;
1683 }
1684 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1685 }
1686 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1688 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1689 // An initial heap size was specified on the command line,
1690 // so be sure that the maximum size is consistent. Done
1691 // after call to limit_by_allocatable_memory because that
1692 // method might reduce the allocation size.
1693 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1694 }
1696 if (PrintGCDetails && Verbose) {
1697 // Cannot use gclog_or_tty yet.
1698 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1699 }
1700 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1701 }
1703 // If the minimum or initial heap_size have not been set or requested to be set
1704 // ergonomically, set them accordingly.
1705 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1706 julong reasonable_minimum = (julong)(OldSize + NewSize);
1708 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1710 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1712 if (InitialHeapSize == 0) {
1713 julong reasonable_initial = phys_mem / InitialRAMFraction;
1715 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1716 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1718 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1720 if (PrintGCDetails && Verbose) {
1721 // Cannot use gclog_or_tty yet.
1722 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1723 }
1724 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1725 }
1726 // If the minimum heap size has not been set (via -Xms),
1727 // synchronize with InitialHeapSize to avoid errors with the default value.
1728 if (min_heap_size() == 0) {
1729 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1730 if (PrintGCDetails && Verbose) {
1731 // Cannot use gclog_or_tty yet.
1732 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1733 }
1734 }
1735 }
1736 }
1738 // This must be called after ergonomics because we want bytecode rewriting
1739 // if the server compiler is used, or if UseSharedSpaces is disabled.
1740 void Arguments::set_bytecode_flags() {
1741 // Better not attempt to store into a read-only space.
1742 if (UseSharedSpaces) {
1743 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1744 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1745 }
1747 if (!RewriteBytecodes) {
1748 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1749 }
1750 }
1752 // Aggressive optimization flags -XX:+AggressiveOpts
1753 void Arguments::set_aggressive_opts_flags() {
1754 #ifdef COMPILER2
1755 if (AggressiveUnboxing) {
1756 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1757 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1758 } else if (!EliminateAutoBox) {
1759 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1760 AggressiveUnboxing = false;
1761 }
1762 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1763 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1764 } else if (!DoEscapeAnalysis) {
1765 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1766 AggressiveUnboxing = false;
1767 }
1768 }
1769 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1770 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1771 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1772 }
1773 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1774 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1775 }
1777 // Feed the cache size setting into the JDK
1778 char buffer[1024];
1779 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1780 add_property(buffer);
1781 }
1782 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1783 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1784 }
1785 #endif
1787 if (AggressiveOpts) {
1788 // Sample flag setting code
1789 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1790 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1791 // }
1792 }
1793 }
1795 //===========================================================================================================
1796 // Parsing of java.compiler property
1798 void Arguments::process_java_compiler_argument(char* arg) {
1799 // For backwards compatibility, Djava.compiler=NONE or ""
1800 // causes us to switch to -Xint mode UNLESS -Xdebug
1801 // is also specified.
1802 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1803 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1804 }
1805 }
1807 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1808 _sun_java_launcher = strdup(launcher);
1809 if (strcmp("gamma", _sun_java_launcher) == 0) {
1810 _created_by_gamma_launcher = true;
1811 }
1812 }
1814 bool Arguments::created_by_java_launcher() {
1815 assert(_sun_java_launcher != NULL, "property must have value");
1816 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1817 }
1819 bool Arguments::created_by_gamma_launcher() {
1820 return _created_by_gamma_launcher;
1821 }
1823 //===========================================================================================================
1824 // Parsing of main arguments
1826 bool Arguments::verify_interval(uintx val, uintx min,
1827 uintx max, const char* name) {
1828 // Returns true iff value is in the inclusive interval [min..max]
1829 // false, otherwise.
1830 if (val >= min && val <= max) {
1831 return true;
1832 }
1833 jio_fprintf(defaultStream::error_stream(),
1834 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1835 " and " UINTX_FORMAT "\n",
1836 name, val, min, max);
1837 return false;
1838 }
1840 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1841 // Returns true if given value is at least specified min threshold
1842 // false, otherwise.
1843 if (val >= min ) {
1844 return true;
1845 }
1846 jio_fprintf(defaultStream::error_stream(),
1847 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1848 name, val, min);
1849 return false;
1850 }
1852 bool Arguments::verify_percentage(uintx value, const char* name) {
1853 if (value <= 100) {
1854 return true;
1855 }
1856 jio_fprintf(defaultStream::error_stream(),
1857 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1858 name, value);
1859 return false;
1860 }
1862 #if !INCLUDE_ALL_GCS
1863 #ifdef ASSERT
1864 static bool verify_serial_gc_flags() {
1865 return (UseSerialGC &&
1866 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1867 UseParallelGC || UseParallelOldGC));
1868 }
1869 #endif // ASSERT
1870 #endif // INCLUDE_ALL_GCS
1872 // check if do gclog rotation
1873 // +UseGCLogFileRotation is a must,
1874 // no gc log rotation when log file not supplied or
1875 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1876 void check_gclog_consistency() {
1877 if (UseGCLogFileRotation) {
1878 if ((Arguments::gc_log_filename() == NULL) ||
1879 (NumberOfGCLogFiles == 0) ||
1880 (GCLogFileSize == 0)) {
1881 jio_fprintf(defaultStream::output_stream(),
1882 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>[k|K|m|M|g|G]\n"
1883 "where num_of_file > 0 and num_of_size > 0\n"
1884 "GC log rotation is turned off\n");
1885 UseGCLogFileRotation = false;
1886 }
1887 }
1889 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1890 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1891 jio_fprintf(defaultStream::output_stream(),
1892 "GCLogFileSize changed to minimum 8K\n");
1893 }
1894 }
1896 // This function is called for -Xloggc:<filename>, it can be used
1897 // to check if a given file name(or string) conforms to the following
1898 // specification:
1899 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1900 // %p and %t only allowed once. We only limit usage of filename not path
1901 bool is_filename_valid(const char *file_name) {
1902 const char* p = file_name;
1903 char file_sep = os::file_separator()[0];
1904 const char* cp;
1905 // skip prefix path
1906 for (cp = file_name; *cp != '\0'; cp++) {
1907 if (*cp == '/' || *cp == file_sep) {
1908 p = cp + 1;
1909 }
1910 }
1912 int count_p = 0;
1913 int count_t = 0;
1914 while (*p != '\0') {
1915 if ((*p >= '0' && *p <= '9') ||
1916 (*p >= 'A' && *p <= 'Z') ||
1917 (*p >= 'a' && *p <= 'z') ||
1918 *p == '-' ||
1919 *p == '_' ||
1920 *p == '.') {
1921 p++;
1922 continue;
1923 }
1924 if (*p == '%') {
1925 if(*(p + 1) == 'p') {
1926 p += 2;
1927 count_p ++;
1928 continue;
1929 }
1930 if (*(p + 1) == 't') {
1931 p += 2;
1932 count_t ++;
1933 continue;
1934 }
1935 }
1936 return false;
1937 }
1938 return count_p < 2 && count_t < 2;
1939 }
1941 // Check consistency of GC selection
1942 bool Arguments::check_gc_consistency() {
1943 check_gclog_consistency();
1944 bool status = true;
1945 // Ensure that the user has not selected conflicting sets
1946 // of collectors. [Note: this check is merely a user convenience;
1947 // collectors over-ride each other so that only a non-conflicting
1948 // set is selected; however what the user gets is not what they
1949 // may have expected from the combination they asked for. It's
1950 // better to reduce user confusion by not allowing them to
1951 // select conflicting combinations.
1952 uint i = 0;
1953 if (UseSerialGC) i++;
1954 if (UseConcMarkSweepGC || UseParNewGC) i++;
1955 if (UseParallelGC || UseParallelOldGC) i++;
1956 if (UseG1GC) i++;
1957 if (i > 1) {
1958 jio_fprintf(defaultStream::error_stream(),
1959 "Conflicting collector combinations in option list; "
1960 "please refer to the release notes for the combinations "
1961 "allowed\n");
1962 status = false;
1963 }
1964 return status;
1965 }
1967 void Arguments::check_deprecated_gcs() {
1968 if (UseConcMarkSweepGC && !UseParNewGC) {
1969 warning("Using the DefNew young collector with the CMS collector is deprecated "
1970 "and will likely be removed in a future release");
1971 }
1973 if (UseParNewGC && !UseConcMarkSweepGC) {
1974 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
1975 // set up UseSerialGC properly, so that can't be used in the check here.
1976 warning("Using the ParNew young collector with the Serial old collector is deprecated "
1977 "and will likely be removed in a future release");
1978 }
1980 if (CMSIncrementalMode) {
1981 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
1982 }
1983 }
1985 void Arguments::check_deprecated_gc_flags() {
1986 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
1987 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
1988 "and will likely be removed in future release");
1989 }
1990 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
1991 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
1992 "Use MaxRAMFraction instead.");
1993 }
1994 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
1995 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
1996 }
1997 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
1998 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
1999 }
2000 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2001 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2002 }
2003 }
2005 // Check stack pages settings
2006 bool Arguments::check_stack_pages()
2007 {
2008 bool status = true;
2009 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2010 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2011 // greater stack shadow pages can't generate instruction to bang stack
2012 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2013 return status;
2014 }
2016 // Check the consistency of vm_init_args
2017 bool Arguments::check_vm_args_consistency() {
2018 // Method for adding checks for flag consistency.
2019 // The intent is to warn the user of all possible conflicts,
2020 // before returning an error.
2021 // Note: Needs platform-dependent factoring.
2022 bool status = true;
2024 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2025 // builds so the cost of stack banging can be measured.
2026 #if (defined(PRODUCT) && defined(SOLARIS))
2027 if (!UseBoundThreads && !UseStackBanging) {
2028 jio_fprintf(defaultStream::error_stream(),
2029 "-UseStackBanging conflicts with -UseBoundThreads\n");
2031 status = false;
2032 }
2033 #endif
2035 if (TLABRefillWasteFraction == 0) {
2036 jio_fprintf(defaultStream::error_stream(),
2037 "TLABRefillWasteFraction should be a denominator, "
2038 "not " SIZE_FORMAT "\n",
2039 TLABRefillWasteFraction);
2040 status = false;
2041 }
2043 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2044 "AdaptiveSizePolicyWeight");
2045 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2046 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
2047 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
2049 // Divide by bucket size to prevent a large size from causing rollover when
2050 // calculating amount of memory needed to be allocated for the String table.
2051 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2052 (max_uintx / StringTable::bucket_size()), "StringTable size");
2054 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2055 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2057 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
2058 jio_fprintf(defaultStream::error_stream(),
2059 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2060 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
2061 MinHeapFreeRatio, MaxHeapFreeRatio);
2062 status = false;
2063 }
2064 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2065 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
2067 // Min/MaxMetaspaceFreeRatio
2068 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2069 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2071 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2072 jio_fprintf(defaultStream::error_stream(),
2073 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2074 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2075 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2076 MinMetaspaceFreeRatio,
2077 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2078 MaxMetaspaceFreeRatio);
2079 status = false;
2080 }
2082 // Trying to keep 100% free is not practical
2083 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2085 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2086 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2087 }
2089 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2090 // Settings to encourage splitting.
2091 if (!FLAG_IS_CMDLINE(NewRatio)) {
2092 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2093 }
2094 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2095 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2096 }
2097 }
2099 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2100 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2101 if (GCTimeLimit == 100) {
2102 // Turn off gc-overhead-limit-exceeded checks
2103 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2104 }
2106 status = status && check_gc_consistency();
2107 status = status && check_stack_pages();
2109 if (CMSIncrementalMode) {
2110 if (!UseConcMarkSweepGC) {
2111 jio_fprintf(defaultStream::error_stream(),
2112 "error: invalid argument combination.\n"
2113 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2114 "selected in order\nto use CMSIncrementalMode.\n");
2115 status = false;
2116 } else {
2117 status = status && verify_percentage(CMSIncrementalDutyCycle,
2118 "CMSIncrementalDutyCycle");
2119 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2120 "CMSIncrementalDutyCycleMin");
2121 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2122 "CMSIncrementalSafetyFactor");
2123 status = status && verify_percentage(CMSIncrementalOffset,
2124 "CMSIncrementalOffset");
2125 status = status && verify_percentage(CMSExpAvgFactor,
2126 "CMSExpAvgFactor");
2127 // If it was not set on the command line, set
2128 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2129 if (CMSInitiatingOccupancyFraction < 0) {
2130 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2131 }
2132 }
2133 }
2135 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2136 // insists that we hold the requisite locks so that the iteration is
2137 // MT-safe. For the verification at start-up and shut-down, we don't
2138 // yet have a good way of acquiring and releasing these locks,
2139 // which are not visible at the CollectedHeap level. We want to
2140 // be able to acquire these locks and then do the iteration rather
2141 // than just disable the lock verification. This will be fixed under
2142 // bug 4788986.
2143 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2144 if (VerifyDuringStartup) {
2145 warning("Heap verification at start-up disabled "
2146 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2147 VerifyDuringStartup = false; // Disable verification at start-up
2148 }
2150 if (VerifyBeforeExit) {
2151 warning("Heap verification at shutdown disabled "
2152 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2153 VerifyBeforeExit = false; // Disable verification at shutdown
2154 }
2155 }
2157 // Note: only executed in non-PRODUCT mode
2158 if (!UseAsyncConcMarkSweepGC &&
2159 (ExplicitGCInvokesConcurrent ||
2160 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2161 jio_fprintf(defaultStream::error_stream(),
2162 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2163 " with -UseAsyncConcMarkSweepGC");
2164 status = false;
2165 }
2167 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2169 #if INCLUDE_ALL_GCS
2170 if (UseG1GC) {
2171 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2172 "InitiatingHeapOccupancyPercent");
2173 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2174 "G1RefProcDrainInterval");
2175 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2176 "G1ConcMarkStepDurationMillis");
2177 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2178 "G1ConcRSHotCardLimit");
2179 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2180 "G1ConcRSLogCacheSize");
2181 }
2182 if (UseConcMarkSweepGC) {
2183 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2184 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2185 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2186 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2188 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2190 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2191 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2192 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2194 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2196 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2197 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2199 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2200 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2201 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2203 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2205 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2207 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2208 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2209 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2210 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2211 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2212 }
2214 if (UseParallelGC || UseParallelOldGC) {
2215 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2216 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2218 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2219 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2221 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2222 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2224 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2226 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2227 }
2228 #endif // INCLUDE_ALL_GCS
2230 status = status && verify_interval(RefDiscoveryPolicy,
2231 ReferenceProcessor::DiscoveryPolicyMin,
2232 ReferenceProcessor::DiscoveryPolicyMax,
2233 "RefDiscoveryPolicy");
2235 // Limit the lower bound of this flag to 1 as it is used in a division
2236 // expression.
2237 status = status && verify_interval(TLABWasteTargetPercent,
2238 1, 100, "TLABWasteTargetPercent");
2240 status = status && verify_object_alignment();
2242 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2243 "CompressedClassSpaceSize");
2245 status = status && verify_interval(MarkStackSizeMax,
2246 1, (max_jint - 1), "MarkStackSizeMax");
2247 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2249 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2251 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2253 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2255 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2256 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2258 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2260 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2261 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2262 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2263 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2265 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2266 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2268 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2269 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2270 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2272 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2273 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2275 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2276 // just for that, so hardcode here.
2277 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2278 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2279 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2280 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2282 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2283 #ifdef SPARC
2284 if (UseConcMarkSweepGC || UseG1GC) {
2285 // Issue a stern warning if the user has explicitly set
2286 // UseMemSetInBOT (it is known to cause issues), but allow
2287 // use for experimentation and debugging.
2288 if (VM_Version::is_sun4v() && UseMemSetInBOT) {
2289 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
2290 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
2291 " on sun4v; please understand that you are using at your own risk!");
2292 }
2293 }
2294 #endif // SPARC
2296 if (PrintNMTStatistics) {
2297 #if INCLUDE_NMT
2298 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2299 #endif // INCLUDE_NMT
2300 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2301 PrintNMTStatistics = false;
2302 #if INCLUDE_NMT
2303 }
2304 #endif
2305 }
2307 // Need to limit the extent of the padding to reasonable size.
2308 // 8K is well beyond the reasonable HW cache line size, even with the
2309 // aggressive prefetching, while still leaving the room for segregating
2310 // among the distinct pages.
2311 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2312 jio_fprintf(defaultStream::error_stream(),
2313 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2314 ContendedPaddingWidth, 0, 8192);
2315 status = false;
2316 }
2318 // Need to enforce the padding not to break the existing field alignments.
2319 // It is sufficient to check against the largest type size.
2320 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2321 jio_fprintf(defaultStream::error_stream(),
2322 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2323 ContendedPaddingWidth, BytesPerLong);
2324 status = false;
2325 }
2327 // Check lower bounds of the code cache
2328 // Template Interpreter code is approximately 3X larger in debug builds.
2329 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2330 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2331 jio_fprintf(defaultStream::error_stream(),
2332 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2333 os::vm_page_size()/K);
2334 status = false;
2335 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2336 jio_fprintf(defaultStream::error_stream(),
2337 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2338 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2339 status = false;
2340 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2341 jio_fprintf(defaultStream::error_stream(),
2342 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2343 min_code_cache_size/K);
2344 status = false;
2345 } else if (ReservedCodeCacheSize > 2*G) {
2346 // Code cache size larger than MAXINT is not supported.
2347 jio_fprintf(defaultStream::error_stream(),
2348 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2349 (2*G)/M);
2350 status = false;
2351 }
2353 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2354 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2356 return status;
2357 }
2359 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2360 const char* option_type) {
2361 if (ignore) return false;
2363 const char* spacer = " ";
2364 if (option_type == NULL) {
2365 option_type = ++spacer; // Set both to the empty string.
2366 }
2368 if (os::obsolete_option(option)) {
2369 jio_fprintf(defaultStream::error_stream(),
2370 "Obsolete %s%soption: %s\n", option_type, spacer,
2371 option->optionString);
2372 return false;
2373 } else {
2374 jio_fprintf(defaultStream::error_stream(),
2375 "Unrecognized %s%soption: %s\n", option_type, spacer,
2376 option->optionString);
2377 return true;
2378 }
2379 }
2381 static const char* user_assertion_options[] = {
2382 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2383 };
2385 static const char* system_assertion_options[] = {
2386 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2387 };
2389 // Return true if any of the strings in null-terminated array 'names' matches.
2390 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2391 // the option must match exactly.
2392 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2393 bool tail_allowed) {
2394 for (/* empty */; *names != NULL; ++names) {
2395 if (match_option(option, *names, tail)) {
2396 if (**tail == '\0' || tail_allowed && **tail == ':') {
2397 return true;
2398 }
2399 }
2400 }
2401 return false;
2402 }
2404 bool Arguments::parse_uintx(const char* value,
2405 uintx* uintx_arg,
2406 uintx min_size) {
2408 // Check the sign first since atomull() parses only unsigned values.
2409 bool value_is_positive = !(*value == '-');
2411 if (value_is_positive) {
2412 julong n;
2413 bool good_return = atomull(value, &n);
2414 if (good_return) {
2415 bool above_minimum = n >= min_size;
2416 bool value_is_too_large = n > max_uintx;
2418 if (above_minimum && !value_is_too_large) {
2419 *uintx_arg = n;
2420 return true;
2421 }
2422 }
2423 }
2424 return false;
2425 }
2427 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2428 julong* long_arg,
2429 julong min_size) {
2430 if (!atomull(s, long_arg)) return arg_unreadable;
2431 return check_memory_size(*long_arg, min_size);
2432 }
2434 // Parse JavaVMInitArgs structure
2436 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2437 // For components of the system classpath.
2438 SysClassPath scp(Arguments::get_sysclasspath());
2439 bool scp_assembly_required = false;
2441 // Save default settings for some mode flags
2442 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2443 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2444 Arguments::_ClipInlining = ClipInlining;
2445 Arguments::_BackgroundCompilation = BackgroundCompilation;
2447 // Setup flags for mixed which is the default
2448 set_mode_flags(_mixed);
2450 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2451 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2452 if (result != JNI_OK) {
2453 return result;
2454 }
2456 // Parse JavaVMInitArgs structure passed in
2457 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2458 if (result != JNI_OK) {
2459 return result;
2460 }
2462 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2463 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2464 if (result != JNI_OK) {
2465 return result;
2466 }
2468 // Do final processing now that all arguments have been parsed
2469 result = finalize_vm_init_args(&scp, scp_assembly_required);
2470 if (result != JNI_OK) {
2471 return result;
2472 }
2474 return JNI_OK;
2475 }
2477 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2478 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2479 // are dealing with -agentpath (case where name is a path), otherwise with
2480 // -agentlib
2481 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2482 char *_name;
2483 const char *_hprof = "hprof", *_jdwp = "jdwp";
2484 size_t _len_hprof, _len_jdwp, _len_prefix;
2486 if (is_path) {
2487 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2488 return false;
2489 }
2491 _name++; // skip past last path separator
2492 _len_prefix = strlen(JNI_LIB_PREFIX);
2494 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2495 return false;
2496 }
2498 _name += _len_prefix;
2499 _len_hprof = strlen(_hprof);
2500 _len_jdwp = strlen(_jdwp);
2502 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2503 _name += _len_hprof;
2504 }
2505 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2506 _name += _len_jdwp;
2507 }
2508 else {
2509 return false;
2510 }
2512 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2513 return false;
2514 }
2516 return true;
2517 }
2519 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2520 return true;
2521 }
2523 return false;
2524 }
2526 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2527 SysClassPath* scp_p,
2528 bool* scp_assembly_required_p,
2529 Flag::Flags origin) {
2530 // Remaining part of option string
2531 const char* tail;
2533 // iterate over arguments
2534 for (int index = 0; index < args->nOptions; index++) {
2535 bool is_absolute_path = false; // for -agentpath vs -agentlib
2537 const JavaVMOption* option = args->options + index;
2539 if (!match_option(option, "-Djava.class.path", &tail) &&
2540 !match_option(option, "-Dsun.java.command", &tail) &&
2541 !match_option(option, "-Dsun.java.launcher", &tail)) {
2543 // add all jvm options to the jvm_args string. This string
2544 // is used later to set the java.vm.args PerfData string constant.
2545 // the -Djava.class.path and the -Dsun.java.command options are
2546 // omitted from jvm_args string as each have their own PerfData
2547 // string constant object.
2548 build_jvm_args(option->optionString);
2549 }
2551 // -verbose:[class/gc/jni]
2552 if (match_option(option, "-verbose", &tail)) {
2553 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2554 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2555 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2556 } else if (!strcmp(tail, ":gc")) {
2557 FLAG_SET_CMDLINE(bool, PrintGC, true);
2558 } else if (!strcmp(tail, ":jni")) {
2559 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2560 }
2561 // -da / -ea / -disableassertions / -enableassertions
2562 // These accept an optional class/package name separated by a colon, e.g.,
2563 // -da:java.lang.Thread.
2564 } else if (match_option(option, user_assertion_options, &tail, true)) {
2565 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2566 if (*tail == '\0') {
2567 JavaAssertions::setUserClassDefault(enable);
2568 } else {
2569 assert(*tail == ':', "bogus match by match_option()");
2570 JavaAssertions::addOption(tail + 1, enable);
2571 }
2572 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2573 } else if (match_option(option, system_assertion_options, &tail, false)) {
2574 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2575 JavaAssertions::setSystemClassDefault(enable);
2576 // -bootclasspath:
2577 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2578 scp_p->reset_path(tail);
2579 *scp_assembly_required_p = true;
2580 // -bootclasspath/a:
2581 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2582 scp_p->add_suffix(tail);
2583 *scp_assembly_required_p = true;
2584 // -bootclasspath/p:
2585 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2586 scp_p->add_prefix(tail);
2587 *scp_assembly_required_p = true;
2588 // -Xrun
2589 } else if (match_option(option, "-Xrun", &tail)) {
2590 if (tail != NULL) {
2591 const char* pos = strchr(tail, ':');
2592 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2593 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2594 name[len] = '\0';
2596 char *options = NULL;
2597 if(pos != NULL) {
2598 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2599 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2600 }
2601 #if !INCLUDE_JVMTI
2602 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2603 jio_fprintf(defaultStream::error_stream(),
2604 "Profiling and debugging agents are not supported in this VM\n");
2605 return JNI_ERR;
2606 }
2607 #endif // !INCLUDE_JVMTI
2608 add_init_library(name, options);
2609 }
2610 // -agentlib and -agentpath
2611 } else if (match_option(option, "-agentlib:", &tail) ||
2612 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2613 if(tail != NULL) {
2614 const char* pos = strchr(tail, '=');
2615 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2616 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2617 name[len] = '\0';
2619 char *options = NULL;
2620 if(pos != NULL) {
2621 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2622 }
2623 #if !INCLUDE_JVMTI
2624 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2625 jio_fprintf(defaultStream::error_stream(),
2626 "Profiling and debugging agents are not supported in this VM\n");
2627 return JNI_ERR;
2628 }
2629 #endif // !INCLUDE_JVMTI
2630 add_init_agent(name, options, is_absolute_path);
2631 }
2632 // -javaagent
2633 } else if (match_option(option, "-javaagent:", &tail)) {
2634 #if !INCLUDE_JVMTI
2635 jio_fprintf(defaultStream::error_stream(),
2636 "Instrumentation agents are not supported in this VM\n");
2637 return JNI_ERR;
2638 #else
2639 if(tail != NULL) {
2640 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2641 add_init_agent("instrument", options, false);
2642 }
2643 #endif // !INCLUDE_JVMTI
2644 // -Xnoclassgc
2645 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2646 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2647 // -Xincgc: i-CMS
2648 } else if (match_option(option, "-Xincgc", &tail)) {
2649 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2650 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2651 // -Xnoincgc: no i-CMS
2652 } else if (match_option(option, "-Xnoincgc", &tail)) {
2653 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2654 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2655 // -Xconcgc
2656 } else if (match_option(option, "-Xconcgc", &tail)) {
2657 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2658 // -Xnoconcgc
2659 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2660 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2661 // -Xbatch
2662 } else if (match_option(option, "-Xbatch", &tail)) {
2663 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2664 // -Xmn for compatibility with other JVM vendors
2665 } else if (match_option(option, "-Xmn", &tail)) {
2666 julong long_initial_young_size = 0;
2667 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2668 if (errcode != arg_in_range) {
2669 jio_fprintf(defaultStream::error_stream(),
2670 "Invalid initial young generation size: %s\n", option->optionString);
2671 describe_range_error(errcode);
2672 return JNI_EINVAL;
2673 }
2674 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2675 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2676 // -Xms
2677 } else if (match_option(option, "-Xms", &tail)) {
2678 julong long_initial_heap_size = 0;
2679 // an initial heap size of 0 means automatically determine
2680 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2681 if (errcode != arg_in_range) {
2682 jio_fprintf(defaultStream::error_stream(),
2683 "Invalid initial heap size: %s\n", option->optionString);
2684 describe_range_error(errcode);
2685 return JNI_EINVAL;
2686 }
2687 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2688 // Currently the minimum size and the initial heap sizes are the same.
2689 set_min_heap_size(InitialHeapSize);
2690 // -Xmx
2691 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2692 julong long_max_heap_size = 0;
2693 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2694 if (errcode != arg_in_range) {
2695 jio_fprintf(defaultStream::error_stream(),
2696 "Invalid maximum heap size: %s\n", option->optionString);
2697 describe_range_error(errcode);
2698 return JNI_EINVAL;
2699 }
2700 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2701 // Xmaxf
2702 } else if (match_option(option, "-Xmaxf", &tail)) {
2703 char* err;
2704 int maxf = (int)(strtod(tail, &err) * 100);
2705 if (*err != '\0' || maxf < 0 || maxf > 100) {
2706 jio_fprintf(defaultStream::error_stream(),
2707 "Bad max heap free percentage size: %s\n",
2708 option->optionString);
2709 return JNI_EINVAL;
2710 } else {
2711 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2712 }
2713 // Xminf
2714 } else if (match_option(option, "-Xminf", &tail)) {
2715 char* err;
2716 int minf = (int)(strtod(tail, &err) * 100);
2717 if (*err != '\0' || minf < 0 || minf > 100) {
2718 jio_fprintf(defaultStream::error_stream(),
2719 "Bad min heap free percentage size: %s\n",
2720 option->optionString);
2721 return JNI_EINVAL;
2722 } else {
2723 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2724 }
2725 // -Xss
2726 } else if (match_option(option, "-Xss", &tail)) {
2727 julong long_ThreadStackSize = 0;
2728 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2729 if (errcode != arg_in_range) {
2730 jio_fprintf(defaultStream::error_stream(),
2731 "Invalid thread stack size: %s\n", option->optionString);
2732 describe_range_error(errcode);
2733 return JNI_EINVAL;
2734 }
2735 // Internally track ThreadStackSize in units of 1024 bytes.
2736 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2737 round_to((int)long_ThreadStackSize, K) / K);
2738 // -Xoss
2739 } else if (match_option(option, "-Xoss", &tail)) {
2740 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2741 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2742 julong long_CodeCacheExpansionSize = 0;
2743 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2744 if (errcode != arg_in_range) {
2745 jio_fprintf(defaultStream::error_stream(),
2746 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2747 os::vm_page_size()/K);
2748 return JNI_EINVAL;
2749 }
2750 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2751 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2752 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2753 julong long_ReservedCodeCacheSize = 0;
2755 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2756 if (errcode != arg_in_range) {
2757 jio_fprintf(defaultStream::error_stream(),
2758 "Invalid maximum code cache size: %s.\n", option->optionString);
2759 return JNI_EINVAL;
2760 }
2761 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2762 //-XX:IncreaseFirstTierCompileThresholdAt=
2763 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2764 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2765 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2766 jio_fprintf(defaultStream::error_stream(),
2767 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2768 option->optionString);
2769 return JNI_EINVAL;
2770 }
2771 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2772 // -green
2773 } else if (match_option(option, "-green", &tail)) {
2774 jio_fprintf(defaultStream::error_stream(),
2775 "Green threads support not available\n");
2776 return JNI_EINVAL;
2777 // -native
2778 } else if (match_option(option, "-native", &tail)) {
2779 // HotSpot always uses native threads, ignore silently for compatibility
2780 // -Xsqnopause
2781 } else if (match_option(option, "-Xsqnopause", &tail)) {
2782 // EVM option, ignore silently for compatibility
2783 // -Xrs
2784 } else if (match_option(option, "-Xrs", &tail)) {
2785 // Classic/EVM option, new functionality
2786 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2787 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2788 // change default internal VM signals used - lower case for back compat
2789 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2790 // -Xoptimize
2791 } else if (match_option(option, "-Xoptimize", &tail)) {
2792 // EVM option, ignore silently for compatibility
2793 // -Xprof
2794 } else if (match_option(option, "-Xprof", &tail)) {
2795 #if INCLUDE_FPROF
2796 _has_profile = true;
2797 #else // INCLUDE_FPROF
2798 jio_fprintf(defaultStream::error_stream(),
2799 "Flat profiling is not supported in this VM.\n");
2800 return JNI_ERR;
2801 #endif // INCLUDE_FPROF
2802 // -Xconcurrentio
2803 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2804 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2805 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2806 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2807 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2808 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2810 // -Xinternalversion
2811 } else if (match_option(option, "-Xinternalversion", &tail)) {
2812 jio_fprintf(defaultStream::output_stream(), "%s\n",
2813 VM_Version::internal_vm_info_string());
2814 vm_exit(0);
2815 #ifndef PRODUCT
2816 // -Xprintflags
2817 } else if (match_option(option, "-Xprintflags", &tail)) {
2818 CommandLineFlags::printFlags(tty, false);
2819 vm_exit(0);
2820 #endif
2821 // -D
2822 } else if (match_option(option, "-D", &tail)) {
2823 if (!add_property(tail)) {
2824 return JNI_ENOMEM;
2825 }
2826 // Out of the box management support
2827 if (match_option(option, "-Dcom.sun.management", &tail)) {
2828 #if INCLUDE_MANAGEMENT
2829 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2830 #else
2831 jio_fprintf(defaultStream::output_stream(),
2832 "-Dcom.sun.management is not supported in this VM.\n");
2833 return JNI_ERR;
2834 #endif
2835 }
2836 // -Xint
2837 } else if (match_option(option, "-Xint", &tail)) {
2838 set_mode_flags(_int);
2839 // -Xmixed
2840 } else if (match_option(option, "-Xmixed", &tail)) {
2841 set_mode_flags(_mixed);
2842 // -Xcomp
2843 } else if (match_option(option, "-Xcomp", &tail)) {
2844 // for testing the compiler; turn off all flags that inhibit compilation
2845 set_mode_flags(_comp);
2846 // -Xshare:dump
2847 } else if (match_option(option, "-Xshare:dump", &tail)) {
2848 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2849 set_mode_flags(_int); // Prevent compilation, which creates objects
2850 // -Xshare:on
2851 } else if (match_option(option, "-Xshare:on", &tail)) {
2852 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2853 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2854 // -Xshare:auto
2855 } else if (match_option(option, "-Xshare:auto", &tail)) {
2856 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2857 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2858 // -Xshare:off
2859 } else if (match_option(option, "-Xshare:off", &tail)) {
2860 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2861 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2862 // -Xverify
2863 } else if (match_option(option, "-Xverify", &tail)) {
2864 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2865 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2866 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2867 } else if (strcmp(tail, ":remote") == 0) {
2868 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2869 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2870 } else if (strcmp(tail, ":none") == 0) {
2871 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2872 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2873 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2874 return JNI_EINVAL;
2875 }
2876 // -Xdebug
2877 } else if (match_option(option, "-Xdebug", &tail)) {
2878 // note this flag has been used, then ignore
2879 set_xdebug_mode(true);
2880 // -Xnoagent
2881 } else if (match_option(option, "-Xnoagent", &tail)) {
2882 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2883 } else if (match_option(option, "-Xboundthreads", &tail)) {
2884 // Bind user level threads to kernel threads (Solaris only)
2885 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2886 } else if (match_option(option, "-Xloggc:", &tail)) {
2887 // Redirect GC output to the file. -Xloggc:<filename>
2888 // ostream_init_log(), when called will use this filename
2889 // to initialize a fileStream.
2890 _gc_log_filename = strdup(tail);
2891 if (!is_filename_valid(_gc_log_filename)) {
2892 jio_fprintf(defaultStream::output_stream(),
2893 "Invalid file name for use with -Xloggc: Filename can only contain the "
2894 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2895 "Note %%p or %%t can only be used once\n", _gc_log_filename);
2896 return JNI_EINVAL;
2897 }
2898 FLAG_SET_CMDLINE(bool, PrintGC, true);
2899 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2901 // JNI hooks
2902 } else if (match_option(option, "-Xcheck", &tail)) {
2903 if (!strcmp(tail, ":jni")) {
2904 #if !INCLUDE_JNI_CHECK
2905 warning("JNI CHECKING is not supported in this VM");
2906 #else
2907 CheckJNICalls = true;
2908 #endif // INCLUDE_JNI_CHECK
2909 } else if (is_bad_option(option, args->ignoreUnrecognized,
2910 "check")) {
2911 return JNI_EINVAL;
2912 }
2913 } else if (match_option(option, "vfprintf", &tail)) {
2914 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2915 } else if (match_option(option, "exit", &tail)) {
2916 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2917 } else if (match_option(option, "abort", &tail)) {
2918 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2919 // -XX:+AggressiveHeap
2920 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2922 // This option inspects the machine and attempts to set various
2923 // parameters to be optimal for long-running, memory allocation
2924 // intensive jobs. It is intended for machines with large
2925 // amounts of cpu and memory.
2927 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2928 // VM, but we may not be able to represent the total physical memory
2929 // available (like having 8gb of memory on a box but using a 32bit VM).
2930 // Thus, we need to make sure we're using a julong for intermediate
2931 // calculations.
2932 julong initHeapSize;
2933 julong total_memory = os::physical_memory();
2935 if (total_memory < (julong)256*M) {
2936 jio_fprintf(defaultStream::error_stream(),
2937 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2938 vm_exit(1);
2939 }
2941 // The heap size is half of available memory, or (at most)
2942 // all of possible memory less 160mb (leaving room for the OS
2943 // when using ISM). This is the maximum; because adaptive sizing
2944 // is turned on below, the actual space used may be smaller.
2946 initHeapSize = MIN2(total_memory / (julong)2,
2947 total_memory - (julong)160*M);
2949 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2951 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2952 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2953 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2954 // Currently the minimum size and the initial heap sizes are the same.
2955 set_min_heap_size(initHeapSize);
2956 }
2957 if (FLAG_IS_DEFAULT(NewSize)) {
2958 // Make the young generation 3/8ths of the total heap.
2959 FLAG_SET_CMDLINE(uintx, NewSize,
2960 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2961 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2962 }
2964 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2965 FLAG_SET_DEFAULT(UseLargePages, true);
2966 #endif
2968 // Increase some data structure sizes for efficiency
2969 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2970 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2971 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2973 // See the OldPLABSize comment below, but replace 'after promotion'
2974 // with 'after copying'. YoungPLABSize is the size of the survivor
2975 // space per-gc-thread buffers. The default is 4kw.
2976 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2978 // OldPLABSize is the size of the buffers in the old gen that
2979 // UseParallelGC uses to promote live data that doesn't fit in the
2980 // survivor spaces. At any given time, there's one for each gc thread.
2981 // The default size is 1kw. These buffers are rarely used, since the
2982 // survivor spaces are usually big enough. For specjbb, however, there
2983 // are occasions when there's lots of live data in the young gen
2984 // and we end up promoting some of it. We don't have a definite
2985 // explanation for why bumping OldPLABSize helps, but the theory
2986 // is that a bigger PLAB results in retaining something like the
2987 // original allocation order after promotion, which improves mutator
2988 // locality. A minor effect may be that larger PLABs reduce the
2989 // number of PLAB allocation events during gc. The value of 8kw
2990 // was arrived at by experimenting with specjbb.
2991 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2993 // Enable parallel GC and adaptive generation sizing
2994 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2995 FLAG_SET_DEFAULT(ParallelGCThreads,
2996 Abstract_VM_Version::parallel_worker_threads());
2998 // Encourage steady state memory management
2999 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3001 // This appears to improve mutator locality
3002 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3004 // Get around early Solaris scheduling bug
3005 // (affinity vs other jobs on system)
3006 // but disallow DR and offlining (5008695).
3007 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3009 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3010 // The last option must always win.
3011 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3012 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3013 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3014 // The last option must always win.
3015 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3016 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3017 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3018 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3019 jio_fprintf(defaultStream::error_stream(),
3020 "Please use CMSClassUnloadingEnabled in place of "
3021 "CMSPermGenSweepingEnabled in the future\n");
3022 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3023 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3024 jio_fprintf(defaultStream::error_stream(),
3025 "Please use -XX:+UseGCOverheadLimit in place of "
3026 "-XX:+UseGCTimeLimit in the future\n");
3027 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3028 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3029 jio_fprintf(defaultStream::error_stream(),
3030 "Please use -XX:-UseGCOverheadLimit in place of "
3031 "-XX:-UseGCTimeLimit in the future\n");
3032 // The TLE options are for compatibility with 1.3 and will be
3033 // removed without notice in a future release. These options
3034 // are not to be documented.
3035 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3036 // No longer used.
3037 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3038 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3039 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3040 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3041 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3042 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3043 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3044 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3045 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3046 // No longer used.
3047 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3048 julong long_tlab_size = 0;
3049 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3050 if (errcode != arg_in_range) {
3051 jio_fprintf(defaultStream::error_stream(),
3052 "Invalid TLAB size: %s\n", option->optionString);
3053 describe_range_error(errcode);
3054 return JNI_EINVAL;
3055 }
3056 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3057 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3058 // No longer used.
3059 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3060 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3061 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3062 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3063 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3064 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3065 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3066 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3067 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3068 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3069 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3070 #if defined(DTRACE_ENABLED)
3071 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3072 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3073 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3074 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3075 #else // defined(DTRACE_ENABLED)
3076 jio_fprintf(defaultStream::error_stream(),
3077 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3078 return JNI_EINVAL;
3079 #endif // defined(DTRACE_ENABLED)
3080 #ifdef ASSERT
3081 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3082 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3083 // disable scavenge before parallel mark-compact
3084 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3085 #endif
3086 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3087 julong cms_blocks_to_claim = (julong)atol(tail);
3088 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3089 jio_fprintf(defaultStream::error_stream(),
3090 "Please use -XX:OldPLABSize in place of "
3091 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3092 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3093 julong cms_blocks_to_claim = (julong)atol(tail);
3094 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3095 jio_fprintf(defaultStream::error_stream(),
3096 "Please use -XX:OldPLABSize in place of "
3097 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3098 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3099 julong old_plab_size = 0;
3100 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3101 if (errcode != arg_in_range) {
3102 jio_fprintf(defaultStream::error_stream(),
3103 "Invalid old PLAB size: %s\n", option->optionString);
3104 describe_range_error(errcode);
3105 return JNI_EINVAL;
3106 }
3107 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3108 jio_fprintf(defaultStream::error_stream(),
3109 "Please use -XX:OldPLABSize in place of "
3110 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3111 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3112 julong young_plab_size = 0;
3113 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3114 if (errcode != arg_in_range) {
3115 jio_fprintf(defaultStream::error_stream(),
3116 "Invalid young PLAB size: %s\n", option->optionString);
3117 describe_range_error(errcode);
3118 return JNI_EINVAL;
3119 }
3120 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3121 jio_fprintf(defaultStream::error_stream(),
3122 "Please use -XX:YoungPLABSize in place of "
3123 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3124 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3125 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3126 julong stack_size = 0;
3127 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3128 if (errcode != arg_in_range) {
3129 jio_fprintf(defaultStream::error_stream(),
3130 "Invalid mark stack size: %s\n", option->optionString);
3131 describe_range_error(errcode);
3132 return JNI_EINVAL;
3133 }
3134 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3135 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3136 julong max_stack_size = 0;
3137 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3138 if (errcode != arg_in_range) {
3139 jio_fprintf(defaultStream::error_stream(),
3140 "Invalid maximum mark stack size: %s\n",
3141 option->optionString);
3142 describe_range_error(errcode);
3143 return JNI_EINVAL;
3144 }
3145 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3146 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3147 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3148 uintx conc_threads = 0;
3149 if (!parse_uintx(tail, &conc_threads, 1)) {
3150 jio_fprintf(defaultStream::error_stream(),
3151 "Invalid concurrent threads: %s\n", option->optionString);
3152 return JNI_EINVAL;
3153 }
3154 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3155 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3156 julong max_direct_memory_size = 0;
3157 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3158 if (errcode != arg_in_range) {
3159 jio_fprintf(defaultStream::error_stream(),
3160 "Invalid maximum direct memory size: %s\n",
3161 option->optionString);
3162 describe_range_error(errcode);
3163 return JNI_EINVAL;
3164 }
3165 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3166 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3167 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3168 // away and will cause VM initialization failures!
3169 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3170 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3171 #if !INCLUDE_MANAGEMENT
3172 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3173 jio_fprintf(defaultStream::error_stream(),
3174 "ManagementServer is not supported in this VM.\n");
3175 return JNI_ERR;
3176 #endif // INCLUDE_MANAGEMENT
3177 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3178 // Skip -XX:Flags= since that case has already been handled
3179 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3180 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3181 return JNI_EINVAL;
3182 }
3183 }
3184 // Unknown option
3185 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3186 return JNI_ERR;
3187 }
3188 }
3190 // Change the default value for flags which have different default values
3191 // when working with older JDKs.
3192 #ifdef LINUX
3193 if (JDK_Version::current().compare_major(6) <= 0 &&
3194 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3195 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3196 }
3197 #endif // LINUX
3198 return JNI_OK;
3199 }
3201 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3202 // This must be done after all -D arguments have been processed.
3203 scp_p->expand_endorsed();
3205 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3206 // Assemble the bootclasspath elements into the final path.
3207 Arguments::set_sysclasspath(scp_p->combined_path());
3208 }
3210 // This must be done after all arguments have been processed.
3211 // java_compiler() true means set to "NONE" or empty.
3212 if (java_compiler() && !xdebug_mode()) {
3213 // For backwards compatibility, we switch to interpreted mode if
3214 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3215 // not specified.
3216 set_mode_flags(_int);
3217 }
3218 if (CompileThreshold == 0) {
3219 set_mode_flags(_int);
3220 }
3222 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3223 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3224 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3225 }
3227 #ifndef COMPILER2
3228 // Don't degrade server performance for footprint
3229 if (FLAG_IS_DEFAULT(UseLargePages) &&
3230 MaxHeapSize < LargePageHeapSizeThreshold) {
3231 // No need for large granularity pages w/small heaps.
3232 // Note that large pages are enabled/disabled for both the
3233 // Java heap and the code cache.
3234 FLAG_SET_DEFAULT(UseLargePages, false);
3235 }
3237 #else
3238 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3239 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3240 }
3241 #endif
3243 #ifndef TIERED
3244 // Tiered compilation is undefined.
3245 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3246 #endif
3248 // If we are running in a headless jre, force java.awt.headless property
3249 // to be true unless the property has already been set.
3250 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3251 if (os::is_headless_jre()) {
3252 const char* headless = Arguments::get_property("java.awt.headless");
3253 if (headless == NULL) {
3254 char envbuffer[128];
3255 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3256 if (!add_property("java.awt.headless=true")) {
3257 return JNI_ENOMEM;
3258 }
3259 } else {
3260 char buffer[256];
3261 strcpy(buffer, "java.awt.headless=");
3262 strcat(buffer, envbuffer);
3263 if (!add_property(buffer)) {
3264 return JNI_ENOMEM;
3265 }
3266 }
3267 }
3268 }
3270 if (!check_vm_args_consistency()) {
3271 return JNI_ERR;
3272 }
3274 return JNI_OK;
3275 }
3277 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3278 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3279 scp_assembly_required_p);
3280 }
3282 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3283 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3284 scp_assembly_required_p);
3285 }
3287 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3288 const int N_MAX_OPTIONS = 64;
3289 const int OPTION_BUFFER_SIZE = 1024;
3290 char buffer[OPTION_BUFFER_SIZE];
3292 // The variable will be ignored if it exceeds the length of the buffer.
3293 // Don't check this variable if user has special privileges
3294 // (e.g. unix su command).
3295 if (os::getenv(name, buffer, sizeof(buffer)) &&
3296 !os::have_special_privileges()) {
3297 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3298 jio_fprintf(defaultStream::error_stream(),
3299 "Picked up %s: %s\n", name, buffer);
3300 char* rd = buffer; // pointer to the input string (rd)
3301 int i;
3302 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3303 while (isspace(*rd)) rd++; // skip whitespace
3304 if (*rd == 0) break; // we re done when the input string is read completely
3306 // The output, option string, overwrites the input string.
3307 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3308 // input string (rd).
3309 char* wrt = rd;
3311 options[i++].optionString = wrt; // Fill in option
3312 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3313 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3314 int quote = *rd; // matching quote to look for
3315 rd++; // don't copy open quote
3316 while (*rd != quote) { // include everything (even spaces) up until quote
3317 if (*rd == 0) { // string termination means unmatched string
3318 jio_fprintf(defaultStream::error_stream(),
3319 "Unmatched quote in %s\n", name);
3320 return JNI_ERR;
3321 }
3322 *wrt++ = *rd++; // copy to option string
3323 }
3324 rd++; // don't copy close quote
3325 } else {
3326 *wrt++ = *rd++; // copy to option string
3327 }
3328 }
3329 // Need to check if we're done before writing a NULL,
3330 // because the write could be to the byte that rd is pointing to.
3331 if (*rd++ == 0) {
3332 *wrt = 0;
3333 break;
3334 }
3335 *wrt = 0; // Zero terminate option
3336 }
3337 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3338 JavaVMInitArgs vm_args;
3339 vm_args.version = JNI_VERSION_1_2;
3340 vm_args.options = options;
3341 vm_args.nOptions = i;
3342 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3344 if (PrintVMOptions) {
3345 const char* tail;
3346 for (int i = 0; i < vm_args.nOptions; i++) {
3347 const JavaVMOption *option = vm_args.options + i;
3348 if (match_option(option, "-XX:", &tail)) {
3349 logOption(tail);
3350 }
3351 }
3352 }
3354 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3355 }
3356 return JNI_OK;
3357 }
3359 void Arguments::set_shared_spaces_flags() {
3360 if (DumpSharedSpaces) {
3361 if (RequireSharedSpaces) {
3362 warning("cannot dump shared archive while using shared archive");
3363 }
3364 UseSharedSpaces = false;
3365 #ifdef _LP64
3366 if (!UseCompressedOops || !UseCompressedClassPointers) {
3367 vm_exit_during_initialization(
3368 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3369 }
3370 } else {
3371 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.
3372 if (!UseCompressedOops || !UseCompressedClassPointers) {
3373 no_shared_spaces();
3374 }
3375 #endif
3376 }
3377 }
3379 #if !INCLUDE_ALL_GCS
3380 static void force_serial_gc() {
3381 FLAG_SET_DEFAULT(UseSerialGC, true);
3382 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3383 UNSUPPORTED_GC_OPTION(UseG1GC);
3384 UNSUPPORTED_GC_OPTION(UseParallelGC);
3385 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3386 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3387 UNSUPPORTED_GC_OPTION(UseParNewGC);
3388 }
3389 #endif // INCLUDE_ALL_GCS
3391 // Sharing support
3392 // Construct the path to the archive
3393 static char* get_shared_archive_path() {
3394 char *shared_archive_path;
3395 if (SharedArchiveFile == NULL) {
3396 char jvm_path[JVM_MAXPATHLEN];
3397 os::jvm_path(jvm_path, sizeof(jvm_path));
3398 char *end = strrchr(jvm_path, *os::file_separator());
3399 if (end != NULL) *end = '\0';
3400 size_t jvm_path_len = strlen(jvm_path);
3401 size_t file_sep_len = strlen(os::file_separator());
3402 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3403 file_sep_len + 20, mtInternal);
3404 if (shared_archive_path != NULL) {
3405 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3406 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3407 strncat(shared_archive_path, "classes.jsa", 11);
3408 }
3409 } else {
3410 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3411 if (shared_archive_path != NULL) {
3412 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3413 }
3414 }
3415 return shared_archive_path;
3416 }
3418 #ifndef PRODUCT
3419 // Determine whether LogVMOutput should be implicitly turned on.
3420 static bool use_vm_log() {
3421 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3422 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3423 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3424 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3425 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3426 return true;
3427 }
3429 #ifdef COMPILER1
3430 if (PrintC1Statistics) {
3431 return true;
3432 }
3433 #endif // COMPILER1
3435 #ifdef COMPILER2
3436 if (PrintOptoAssembly || PrintOptoStatistics) {
3437 return true;
3438 }
3439 #endif // COMPILER2
3441 return false;
3442 }
3443 #endif // PRODUCT
3445 // Parse entry point called from JNI_CreateJavaVM
3447 jint Arguments::parse(const JavaVMInitArgs* args) {
3449 // Remaining part of option string
3450 const char* tail;
3452 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3453 const char* hotspotrc = ".hotspotrc";
3454 bool settings_file_specified = false;
3455 bool needs_hotspotrc_warning = false;
3457 const char* flags_file;
3458 int index;
3459 for (index = 0; index < args->nOptions; index++) {
3460 const JavaVMOption *option = args->options + index;
3461 if (match_option(option, "-XX:Flags=", &tail)) {
3462 flags_file = tail;
3463 settings_file_specified = true;
3464 }
3465 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3466 PrintVMOptions = true;
3467 }
3468 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3469 PrintVMOptions = false;
3470 }
3471 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3472 IgnoreUnrecognizedVMOptions = true;
3473 }
3474 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3475 IgnoreUnrecognizedVMOptions = false;
3476 }
3477 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3478 CommandLineFlags::printFlags(tty, false);
3479 vm_exit(0);
3480 }
3481 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3482 #if INCLUDE_NMT
3483 MemTracker::init_tracking_options(tail);
3484 #else
3485 jio_fprintf(defaultStream::error_stream(),
3486 "Native Memory Tracking is not supported in this VM\n");
3487 return JNI_ERR;
3488 #endif
3489 }
3492 #ifndef PRODUCT
3493 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3494 CommandLineFlags::printFlags(tty, true);
3495 vm_exit(0);
3496 }
3497 #endif
3498 }
3500 if (IgnoreUnrecognizedVMOptions) {
3501 // uncast const to modify the flag args->ignoreUnrecognized
3502 *(jboolean*)(&args->ignoreUnrecognized) = true;
3503 }
3505 // Parse specified settings file
3506 if (settings_file_specified) {
3507 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3508 return JNI_EINVAL;
3509 }
3510 } else {
3511 #ifdef ASSERT
3512 // Parse default .hotspotrc settings file
3513 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3514 return JNI_EINVAL;
3515 }
3516 #else
3517 struct stat buf;
3518 if (os::stat(hotspotrc, &buf) == 0) {
3519 needs_hotspotrc_warning = true;
3520 }
3521 #endif
3522 }
3524 if (PrintVMOptions) {
3525 for (index = 0; index < args->nOptions; index++) {
3526 const JavaVMOption *option = args->options + index;
3527 if (match_option(option, "-XX:", &tail)) {
3528 logOption(tail);
3529 }
3530 }
3531 }
3533 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3534 jint result = parse_vm_init_args(args);
3535 if (result != JNI_OK) {
3536 return result;
3537 }
3539 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3540 SharedArchivePath = get_shared_archive_path();
3541 if (SharedArchivePath == NULL) {
3542 return JNI_ENOMEM;
3543 }
3545 // Delay warning until here so that we've had a chance to process
3546 // the -XX:-PrintWarnings flag
3547 if (needs_hotspotrc_warning) {
3548 warning("%s file is present but has been ignored. "
3549 "Run with -XX:Flags=%s to load the file.",
3550 hotspotrc, hotspotrc);
3551 }
3553 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3554 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3555 #endif
3557 #if INCLUDE_ALL_GCS
3558 #if (defined JAVASE_EMBEDDED || defined ARM)
3559 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3560 #endif
3561 #endif
3563 #ifndef PRODUCT
3564 if (TraceBytecodesAt != 0) {
3565 TraceBytecodes = true;
3566 }
3567 if (CountCompiledCalls) {
3568 if (UseCounterDecay) {
3569 warning("UseCounterDecay disabled because CountCalls is set");
3570 UseCounterDecay = false;
3571 }
3572 }
3573 #endif // PRODUCT
3575 // JSR 292 is not supported before 1.7
3576 if (!JDK_Version::is_gte_jdk17x_version()) {
3577 if (EnableInvokeDynamic) {
3578 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3579 warning("JSR 292 is not supported before 1.7. Disabling support.");
3580 }
3581 EnableInvokeDynamic = false;
3582 }
3583 }
3585 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3586 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3587 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3588 }
3589 ScavengeRootsInCode = 1;
3590 }
3592 if (PrintGCDetails) {
3593 // Turn on -verbose:gc options as well
3594 PrintGC = true;
3595 }
3597 if (!JDK_Version::is_gte_jdk18x_version()) {
3598 // To avoid changing the log format for 7 updates this flag is only
3599 // true by default in JDK8 and above.
3600 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3601 FLAG_SET_DEFAULT(PrintGCCause, false);
3602 }
3603 }
3605 // Set object alignment values.
3606 set_object_alignment();
3608 #if !INCLUDE_ALL_GCS
3609 force_serial_gc();
3610 #endif // INCLUDE_ALL_GCS
3611 #if !INCLUDE_CDS
3612 if (DumpSharedSpaces || RequireSharedSpaces) {
3613 jio_fprintf(defaultStream::error_stream(),
3614 "Shared spaces are not supported in this VM\n");
3615 return JNI_ERR;
3616 }
3617 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3618 warning("Shared spaces are not supported in this VM");
3619 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3620 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3621 }
3622 no_shared_spaces();
3623 #endif // INCLUDE_CDS
3625 return JNI_OK;
3626 }
3628 jint Arguments::apply_ergo() {
3630 // Set flags based on ergonomics.
3631 set_ergonomics_flags();
3633 set_shared_spaces_flags();
3635 // Check the GC selections again.
3636 if (!check_gc_consistency()) {
3637 return JNI_EINVAL;
3638 }
3640 if (TieredCompilation) {
3641 set_tiered_flags();
3642 } else {
3643 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3644 if (CompilationPolicyChoice >= 2) {
3645 vm_exit_during_initialization(
3646 "Incompatible compilation policy selected", NULL);
3647 }
3648 }
3650 // Set heap size based on available physical memory
3651 set_heap_size();
3653 #if INCLUDE_ALL_GCS
3654 // Set per-collector flags
3655 if (UseParallelGC || UseParallelOldGC) {
3656 set_parallel_gc_flags();
3657 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3658 set_cms_and_parnew_gc_flags();
3659 } else if (UseParNewGC) { // skipped if CMS is set above
3660 set_parnew_gc_flags();
3661 } else if (UseG1GC) {
3662 set_g1_gc_flags();
3663 }
3664 check_deprecated_gcs();
3665 check_deprecated_gc_flags();
3666 if (AssumeMP && !UseSerialGC) {
3667 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3668 warning("If the number of processors is expected to increase from one, then"
3669 " you should configure the number of parallel GC threads appropriately"
3670 " using -XX:ParallelGCThreads=N");
3671 }
3672 }
3673 #else // INCLUDE_ALL_GCS
3674 assert(verify_serial_gc_flags(), "SerialGC unset");
3675 #endif // INCLUDE_ALL_GCS
3677 // Initialize Metaspace flags and alignments.
3678 Metaspace::ergo_initialize();
3680 // Set bytecode rewriting flags
3681 set_bytecode_flags();
3683 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3684 set_aggressive_opts_flags();
3686 // Turn off biased locking for locking debug mode flags,
3687 // which are subtlely different from each other but neither works with
3688 // biased locking.
3689 if (UseHeavyMonitors
3690 #ifdef COMPILER1
3691 || !UseFastLocking
3692 #endif // COMPILER1
3693 ) {
3694 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3695 // flag set to true on command line; warn the user that they
3696 // can't enable biased locking here
3697 warning("Biased Locking is not supported with locking debug flags"
3698 "; ignoring UseBiasedLocking flag." );
3699 }
3700 UseBiasedLocking = false;
3701 }
3703 #ifdef ZERO
3704 // Clear flags not supported on zero.
3705 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3706 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3707 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3708 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3709 #endif // CC_INTERP
3711 #ifdef COMPILER2
3712 if (!UseBiasedLocking || EmitSync != 0) {
3713 UseOptoBiasInlining = false;
3714 }
3715 if (!EliminateLocks) {
3716 EliminateNestedLocks = false;
3717 }
3718 if (!Inline) {
3719 IncrementalInline = false;
3720 }
3721 #ifndef PRODUCT
3722 if (!IncrementalInline) {
3723 AlwaysIncrementalInline = false;
3724 }
3725 #endif
3726 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3727 // incremental inlining: bump MaxNodeLimit
3728 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3729 }
3730 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3731 // nothing to use the profiling, turn if off
3732 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3733 }
3734 if (UseTypeSpeculation && FLAG_IS_DEFAULT(ReplaceInParentMaps)) {
3735 // Doing the replace in parent maps helps speculation
3736 FLAG_SET_DEFAULT(ReplaceInParentMaps, true);
3737 }
3738 #ifndef X86
3739 // Only on x86 for now
3740 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3741 #endif
3742 #endif
3744 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3745 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3746 DebugNonSafepoints = true;
3747 }
3749 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3750 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3751 }
3753 #ifndef PRODUCT
3754 if (CompileTheWorld) {
3755 // Force NmethodSweeper to sweep whole CodeCache each time.
3756 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3757 NmethodSweepFraction = 1;
3758 }
3759 }
3761 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3762 if (use_vm_log()) {
3763 LogVMOutput = true;
3764 }
3765 }
3766 #endif // PRODUCT
3768 if (PrintCommandLineFlags) {
3769 CommandLineFlags::printSetFlags(tty);
3770 }
3772 // Apply CPU specific policy for the BiasedLocking
3773 if (UseBiasedLocking) {
3774 if (!VM_Version::use_biased_locking() &&
3775 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3776 UseBiasedLocking = false;
3777 }
3778 }
3780 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3781 // but only if not already set on the commandline
3782 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3783 bool set = false;
3784 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3785 if (!set) {
3786 FLAG_SET_DEFAULT(PauseAtExit, true);
3787 }
3788 }
3790 return JNI_OK;
3791 }
3793 jint Arguments::adjust_after_os() {
3794 #if INCLUDE_ALL_GCS
3795 if (UseParallelGC || UseParallelOldGC) {
3796 if (UseNUMA) {
3797 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3798 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3799 }
3800 // For those collectors or operating systems (eg, Windows) that do
3801 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3802 UseNUMAInterleaving = true;
3803 }
3804 }
3805 #endif // INCLUDE_ALL_GCS
3806 return JNI_OK;
3807 }
3809 int Arguments::PropertyList_count(SystemProperty* pl) {
3810 int count = 0;
3811 while(pl != NULL) {
3812 count++;
3813 pl = pl->next();
3814 }
3815 return count;
3816 }
3818 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3819 assert(key != NULL, "just checking");
3820 SystemProperty* prop;
3821 for (prop = pl; prop != NULL; prop = prop->next()) {
3822 if (strcmp(key, prop->key()) == 0) return prop->value();
3823 }
3824 return NULL;
3825 }
3827 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3828 int count = 0;
3829 const char* ret_val = NULL;
3831 while(pl != NULL) {
3832 if(count >= index) {
3833 ret_val = pl->key();
3834 break;
3835 }
3836 count++;
3837 pl = pl->next();
3838 }
3840 return ret_val;
3841 }
3843 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3844 int count = 0;
3845 char* ret_val = NULL;
3847 while(pl != NULL) {
3848 if(count >= index) {
3849 ret_val = pl->value();
3850 break;
3851 }
3852 count++;
3853 pl = pl->next();
3854 }
3856 return ret_val;
3857 }
3859 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3860 SystemProperty* p = *plist;
3861 if (p == NULL) {
3862 *plist = new_p;
3863 } else {
3864 while (p->next() != NULL) {
3865 p = p->next();
3866 }
3867 p->set_next(new_p);
3868 }
3869 }
3871 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3872 if (plist == NULL)
3873 return;
3875 SystemProperty* new_p = new SystemProperty(k, v, true);
3876 PropertyList_add(plist, new_p);
3877 }
3879 // This add maintains unique property key in the list.
3880 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3881 if (plist == NULL)
3882 return;
3884 // If property key exist then update with new value.
3885 SystemProperty* prop;
3886 for (prop = *plist; prop != NULL; prop = prop->next()) {
3887 if (strcmp(k, prop->key()) == 0) {
3888 if (append) {
3889 prop->append_value(v);
3890 } else {
3891 prop->set_value(v);
3892 }
3893 return;
3894 }
3895 }
3897 PropertyList_add(plist, k, v);
3898 }
3900 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3901 // Returns true if all of the source pointed by src has been copied over to
3902 // the destination buffer pointed by buf. Otherwise, returns false.
3903 // Notes:
3904 // 1. If the length (buflen) of the destination buffer excluding the
3905 // NULL terminator character is not long enough for holding the expanded
3906 // pid characters, it also returns false instead of returning the partially
3907 // expanded one.
3908 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3909 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3910 char* buf, size_t buflen) {
3911 const char* p = src;
3912 char* b = buf;
3913 const char* src_end = &src[srclen];
3914 char* buf_end = &buf[buflen - 1];
3916 while (p < src_end && b < buf_end) {
3917 if (*p == '%') {
3918 switch (*(++p)) {
3919 case '%': // "%%" ==> "%"
3920 *b++ = *p++;
3921 break;
3922 case 'p': { // "%p" ==> current process id
3923 // buf_end points to the character before the last character so
3924 // that we could write '\0' to the end of the buffer.
3925 size_t buf_sz = buf_end - b + 1;
3926 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3928 // if jio_snprintf fails or the buffer is not long enough to hold
3929 // the expanded pid, returns false.
3930 if (ret < 0 || ret >= (int)buf_sz) {
3931 return false;
3932 } else {
3933 b += ret;
3934 assert(*b == '\0', "fail in copy_expand_pid");
3935 if (p == src_end && b == buf_end + 1) {
3936 // reach the end of the buffer.
3937 return true;
3938 }
3939 }
3940 p++;
3941 break;
3942 }
3943 default :
3944 *b++ = '%';
3945 }
3946 } else {
3947 *b++ = *p++;
3948 }
3949 }
3950 *b = '\0';
3951 return (p == src_end); // return false if not all of the source was copied
3952 }