Wed, 27 Aug 2014 08:19:12 -0400
8046598: Scalable Native memory tracking development
Summary: Enhance scalability of native memory tracking
Reviewed-by: coleenp, ctornqvi, gtriantafill
1 /*
2 * Copyright (c) 1997, 2014, 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 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
297 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
298 #ifdef PRODUCT
299 { "DesiredMethodLimit",
300 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
301 #endif // PRODUCT
302 { NULL, JDK_Version(0), JDK_Version(0) }
303 };
305 // Returns true if the flag is obsolete and fits into the range specified
306 // for being ignored. In the case that the flag is ignored, the 'version'
307 // value is filled in with the version number when the flag became
308 // obsolete so that that value can be displayed to the user.
309 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
310 int i = 0;
311 assert(version != NULL, "Must provide a version buffer");
312 while (obsolete_jvm_flags[i].name != NULL) {
313 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
314 // <flag>=xxx form
315 // [-|+]<flag> form
316 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
317 ((s[0] == '+' || s[0] == '-') &&
318 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
319 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
320 *version = flag_status.obsoleted_in;
321 return true;
322 }
323 }
324 i++;
325 }
326 return false;
327 }
329 // Constructs the system class path (aka boot class path) from the following
330 // components, in order:
331 //
332 // prefix // from -Xbootclasspath/p:...
333 // endorsed // the expansion of -Djava.endorsed.dirs=...
334 // base // from os::get_system_properties() or -Xbootclasspath=
335 // suffix // from -Xbootclasspath/a:...
336 //
337 // java.endorsed.dirs is a list of directories; any jar or zip files in the
338 // directories are added to the sysclasspath just before the base.
339 //
340 // This could be AllStatic, but it isn't needed after argument processing is
341 // complete.
342 class SysClassPath: public StackObj {
343 public:
344 SysClassPath(const char* base);
345 ~SysClassPath();
347 inline void set_base(const char* base);
348 inline void add_prefix(const char* prefix);
349 inline void add_suffix_to_prefix(const char* suffix);
350 inline void add_suffix(const char* suffix);
351 inline void reset_path(const char* base);
353 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
354 // property. Must be called after all command-line arguments have been
355 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
356 // combined_path().
357 void expand_endorsed();
359 inline const char* get_base() const { return _items[_scp_base]; }
360 inline const char* get_prefix() const { return _items[_scp_prefix]; }
361 inline const char* get_suffix() const { return _items[_scp_suffix]; }
362 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
364 // Combine all the components into a single c-heap-allocated string; caller
365 // must free the string if/when no longer needed.
366 char* combined_path();
368 private:
369 // Utility routines.
370 static char* add_to_path(const char* path, const char* str, bool prepend);
371 static char* add_jars_to_path(char* path, const char* directory);
373 inline void reset_item_at(int index);
375 // Array indices for the items that make up the sysclasspath. All except the
376 // base are allocated in the C heap and freed by this class.
377 enum {
378 _scp_prefix, // from -Xbootclasspath/p:...
379 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
380 _scp_base, // the default sysclasspath
381 _scp_suffix, // from -Xbootclasspath/a:...
382 _scp_nitems // the number of items, must be last.
383 };
385 const char* _items[_scp_nitems];
386 DEBUG_ONLY(bool _expansion_done;)
387 };
389 SysClassPath::SysClassPath(const char* base) {
390 memset(_items, 0, sizeof(_items));
391 _items[_scp_base] = base;
392 DEBUG_ONLY(_expansion_done = false;)
393 }
395 SysClassPath::~SysClassPath() {
396 // Free everything except the base.
397 for (int i = 0; i < _scp_nitems; ++i) {
398 if (i != _scp_base) reset_item_at(i);
399 }
400 DEBUG_ONLY(_expansion_done = false;)
401 }
403 inline void SysClassPath::set_base(const char* base) {
404 _items[_scp_base] = base;
405 }
407 inline void SysClassPath::add_prefix(const char* prefix) {
408 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
409 }
411 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
412 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
413 }
415 inline void SysClassPath::add_suffix(const char* suffix) {
416 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
417 }
419 inline void SysClassPath::reset_item_at(int index) {
420 assert(index < _scp_nitems && index != _scp_base, "just checking");
421 if (_items[index] != NULL) {
422 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
423 _items[index] = NULL;
424 }
425 }
427 inline void SysClassPath::reset_path(const char* base) {
428 // Clear the prefix and suffix.
429 reset_item_at(_scp_prefix);
430 reset_item_at(_scp_suffix);
431 set_base(base);
432 }
434 //------------------------------------------------------------------------------
436 void SysClassPath::expand_endorsed() {
437 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
439 const char* path = Arguments::get_property("java.endorsed.dirs");
440 if (path == NULL) {
441 path = Arguments::get_endorsed_dir();
442 assert(path != NULL, "no default for java.endorsed.dirs");
443 }
445 char* expanded_path = NULL;
446 const char separator = *os::path_separator();
447 const char* const end = path + strlen(path);
448 while (path < end) {
449 const char* tmp_end = strchr(path, separator);
450 if (tmp_end == NULL) {
451 expanded_path = add_jars_to_path(expanded_path, path);
452 path = end;
453 } else {
454 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
455 memcpy(dirpath, path, tmp_end - path);
456 dirpath[tmp_end - path] = '\0';
457 expanded_path = add_jars_to_path(expanded_path, dirpath);
458 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
459 path = tmp_end + 1;
460 }
461 }
462 _items[_scp_endorsed] = expanded_path;
463 DEBUG_ONLY(_expansion_done = true;)
464 }
466 // Combine the bootclasspath elements, some of which may be null, into a single
467 // c-heap-allocated string.
468 char* SysClassPath::combined_path() {
469 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
470 assert(_expansion_done, "must call expand_endorsed() first.");
472 size_t lengths[_scp_nitems];
473 size_t total_len = 0;
475 const char separator = *os::path_separator();
477 // Get the lengths.
478 int i;
479 for (i = 0; i < _scp_nitems; ++i) {
480 if (_items[i] != NULL) {
481 lengths[i] = strlen(_items[i]);
482 // Include space for the separator char (or a NULL for the last item).
483 total_len += lengths[i] + 1;
484 }
485 }
486 assert(total_len > 0, "empty sysclasspath not allowed");
488 // Copy the _items to a single string.
489 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
490 char* cp_tmp = cp;
491 for (i = 0; i < _scp_nitems; ++i) {
492 if (_items[i] != NULL) {
493 memcpy(cp_tmp, _items[i], lengths[i]);
494 cp_tmp += lengths[i];
495 *cp_tmp++ = separator;
496 }
497 }
498 *--cp_tmp = '\0'; // Replace the extra separator.
499 return cp;
500 }
502 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
503 char*
504 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
505 char *cp;
507 assert(str != NULL, "just checking");
508 if (path == NULL) {
509 size_t len = strlen(str) + 1;
510 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
511 memcpy(cp, str, len); // copy the trailing null
512 } else {
513 const char separator = *os::path_separator();
514 size_t old_len = strlen(path);
515 size_t str_len = strlen(str);
516 size_t len = old_len + str_len + 2;
518 if (prepend) {
519 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
520 char* cp_tmp = cp;
521 memcpy(cp_tmp, str, str_len);
522 cp_tmp += str_len;
523 *cp_tmp = separator;
524 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
525 FREE_C_HEAP_ARRAY(char, path, mtInternal);
526 } else {
527 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
528 char* cp_tmp = cp + old_len;
529 *cp_tmp = separator;
530 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
531 }
532 }
533 return cp;
534 }
536 // Scan the directory and append any jar or zip files found to path.
537 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
538 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
539 DIR* dir = os::opendir(directory);
540 if (dir == NULL) return path;
542 char dir_sep[2] = { '\0', '\0' };
543 size_t directory_len = strlen(directory);
544 const char fileSep = *os::file_separator();
545 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
547 /* Scan the directory for jars/zips, appending them to path. */
548 struct dirent *entry;
549 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
550 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
551 const char* name = entry->d_name;
552 const char* ext = name + strlen(name) - 4;
553 bool isJarOrZip = ext > name &&
554 (os::file_name_strcmp(ext, ".jar") == 0 ||
555 os::file_name_strcmp(ext, ".zip") == 0);
556 if (isJarOrZip) {
557 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
558 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
559 path = add_to_path(path, jarpath, false);
560 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
561 }
562 }
563 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
564 os::closedir(dir);
565 return path;
566 }
568 // Parses a memory size specification string.
569 static bool atomull(const char *s, julong* result) {
570 julong n = 0;
571 int args_read = sscanf(s, JULONG_FORMAT, &n);
572 if (args_read != 1) {
573 return false;
574 }
575 while (*s != '\0' && isdigit(*s)) {
576 s++;
577 }
578 // 4705540: illegal if more characters are found after the first non-digit
579 if (strlen(s) > 1) {
580 return false;
581 }
582 switch (*s) {
583 case 'T': case 't':
584 *result = n * G * K;
585 // Check for overflow.
586 if (*result/((julong)G * K) != n) return false;
587 return true;
588 case 'G': case 'g':
589 *result = n * G;
590 if (*result/G != n) return false;
591 return true;
592 case 'M': case 'm':
593 *result = n * M;
594 if (*result/M != n) return false;
595 return true;
596 case 'K': case 'k':
597 *result = n * K;
598 if (*result/K != n) return false;
599 return true;
600 case '\0':
601 *result = n;
602 return true;
603 default:
604 return false;
605 }
606 }
608 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
609 if (size < min_size) return arg_too_small;
610 // Check that size will fit in a size_t (only relevant on 32-bit)
611 if (size > max_uintx) return arg_too_big;
612 return arg_in_range;
613 }
615 // Describe an argument out of range error
616 void Arguments::describe_range_error(ArgsRange errcode) {
617 switch(errcode) {
618 case arg_too_big:
619 jio_fprintf(defaultStream::error_stream(),
620 "The specified size exceeds the maximum "
621 "representable size.\n");
622 break;
623 case arg_too_small:
624 case arg_unreadable:
625 case arg_in_range:
626 // do nothing for now
627 break;
628 default:
629 ShouldNotReachHere();
630 }
631 }
633 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
634 return CommandLineFlags::boolAtPut(name, &value, origin);
635 }
637 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
638 double v;
639 if (sscanf(value, "%lf", &v) != 1) {
640 return false;
641 }
643 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
644 return true;
645 }
646 return false;
647 }
649 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
650 julong v;
651 intx intx_v;
652 bool is_neg = false;
653 // Check the sign first since atomull() parses only unsigned values.
654 if (*value == '-') {
655 if (!CommandLineFlags::intxAt(name, &intx_v)) {
656 return false;
657 }
658 value++;
659 is_neg = true;
660 }
661 if (!atomull(value, &v)) {
662 return false;
663 }
664 intx_v = (intx) v;
665 if (is_neg) {
666 intx_v = -intx_v;
667 }
668 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
669 return true;
670 }
671 uintx uintx_v = (uintx) v;
672 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
673 return true;
674 }
675 uint64_t uint64_t_v = (uint64_t) v;
676 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
677 return true;
678 }
679 return false;
680 }
682 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
683 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
684 // Contract: CommandLineFlags always returns a pointer that needs freeing.
685 FREE_C_HEAP_ARRAY(char, value, mtInternal);
686 return true;
687 }
689 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
690 const char* old_value = "";
691 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
692 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
693 size_t new_len = strlen(new_value);
694 const char* value;
695 char* free_this_too = NULL;
696 if (old_len == 0) {
697 value = new_value;
698 } else if (new_len == 0) {
699 value = old_value;
700 } else {
701 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
702 // each new setting adds another LINE to the switch:
703 sprintf(buf, "%s\n%s", old_value, new_value);
704 value = buf;
705 free_this_too = buf;
706 }
707 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
708 // CommandLineFlags always returns a pointer that needs freeing.
709 FREE_C_HEAP_ARRAY(char, value, mtInternal);
710 if (free_this_too != NULL) {
711 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
712 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
713 }
714 return true;
715 }
717 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
719 // range of acceptable characters spelled out for portability reasons
720 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
721 #define BUFLEN 255
722 char name[BUFLEN+1];
723 char dummy;
725 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
726 return set_bool_flag(name, false, origin);
727 }
728 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
729 return set_bool_flag(name, true, origin);
730 }
732 char punct;
733 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
734 const char* value = strchr(arg, '=') + 1;
735 Flag* flag = Flag::find_flag(name, strlen(name));
736 if (flag != NULL && flag->is_ccstr()) {
737 if (flag->ccstr_accumulates()) {
738 return append_to_string_flag(name, value, origin);
739 } else {
740 if (value[0] == '\0') {
741 value = NULL;
742 }
743 return set_string_flag(name, value, origin);
744 }
745 }
746 }
748 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
749 const char* value = strchr(arg, '=') + 1;
750 // -XX:Foo:=xxx will reset the string flag to the given value.
751 if (value[0] == '\0') {
752 value = NULL;
753 }
754 return set_string_flag(name, value, origin);
755 }
757 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
758 #define SIGNED_NUMBER_RANGE "[-0123456789]"
759 #define NUMBER_RANGE "[0123456789]"
760 char value[BUFLEN + 1];
761 char value2[BUFLEN + 1];
762 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
763 // Looks like a floating-point number -- try again with more lenient format string
764 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
765 return set_fp_numeric_flag(name, value, origin);
766 }
767 }
769 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
770 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
771 return set_numeric_flag(name, value, origin);
772 }
774 return false;
775 }
777 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
778 assert(bldarray != NULL, "illegal argument");
780 if (arg == NULL) {
781 return;
782 }
784 int new_count = *count + 1;
786 // expand the array and add arg to the last element
787 if (*bldarray == NULL) {
788 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
789 } else {
790 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
791 }
792 (*bldarray)[*count] = strdup(arg);
793 *count = new_count;
794 }
796 void Arguments::build_jvm_args(const char* arg) {
797 add_string(&_jvm_args_array, &_num_jvm_args, arg);
798 }
800 void Arguments::build_jvm_flags(const char* arg) {
801 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
802 }
804 // utility function to return a string that concatenates all
805 // strings in a given char** array
806 const char* Arguments::build_resource_string(char** args, int count) {
807 if (args == NULL || count == 0) {
808 return NULL;
809 }
810 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
811 for (int i = 1; i < count; i++) {
812 length += strlen(args[i]) + 1; // add 1 for a space
813 }
814 char* s = NEW_RESOURCE_ARRAY(char, length);
815 strcpy(s, args[0]);
816 for (int j = 1; j < count; j++) {
817 strcat(s, " ");
818 strcat(s, args[j]);
819 }
820 return (const char*) s;
821 }
823 void Arguments::print_on(outputStream* st) {
824 st->print_cr("VM Arguments:");
825 if (num_jvm_flags() > 0) {
826 st->print("jvm_flags: "); print_jvm_flags_on(st);
827 }
828 if (num_jvm_args() > 0) {
829 st->print("jvm_args: "); print_jvm_args_on(st);
830 }
831 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
832 if (_java_class_path != NULL) {
833 char* path = _java_class_path->value();
834 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
835 }
836 st->print_cr("Launcher Type: %s", _sun_java_launcher);
837 }
839 void Arguments::print_jvm_flags_on(outputStream* st) {
840 if (_num_jvm_flags > 0) {
841 for (int i=0; i < _num_jvm_flags; i++) {
842 st->print("%s ", _jvm_flags_array[i]);
843 }
844 st->cr();
845 }
846 }
848 void Arguments::print_jvm_args_on(outputStream* st) {
849 if (_num_jvm_args > 0) {
850 for (int i=0; i < _num_jvm_args; i++) {
851 st->print("%s ", _jvm_args_array[i]);
852 }
853 st->cr();
854 }
855 }
857 bool Arguments::process_argument(const char* arg,
858 jboolean ignore_unrecognized, Flag::Flags origin) {
860 JDK_Version since = JDK_Version();
862 if (parse_argument(arg, origin) || ignore_unrecognized) {
863 return true;
864 }
866 bool has_plus_minus = (*arg == '+' || *arg == '-');
867 const char* const argname = has_plus_minus ? arg + 1 : arg;
868 if (is_newly_obsolete(arg, &since)) {
869 char version[256];
870 since.to_string(version, sizeof(version));
871 warning("ignoring option %s; support was removed in %s", argname, version);
872 return true;
873 }
875 // For locked flags, report a custom error message if available.
876 // Otherwise, report the standard unrecognized VM option.
878 size_t arg_len;
879 const char* equal_sign = strchr(argname, '=');
880 if (equal_sign == NULL) {
881 arg_len = strlen(argname);
882 } else {
883 arg_len = equal_sign - argname;
884 }
886 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
887 if (found_flag != NULL) {
888 char locked_message_buf[BUFLEN];
889 found_flag->get_locked_message(locked_message_buf, BUFLEN);
890 if (strlen(locked_message_buf) == 0) {
891 if (found_flag->is_bool() && !has_plus_minus) {
892 jio_fprintf(defaultStream::error_stream(),
893 "Missing +/- setting for VM option '%s'\n", argname);
894 } else if (!found_flag->is_bool() && has_plus_minus) {
895 jio_fprintf(defaultStream::error_stream(),
896 "Unexpected +/- setting in VM option '%s'\n", argname);
897 } else {
898 jio_fprintf(defaultStream::error_stream(),
899 "Improperly specified VM option '%s'\n", argname);
900 }
901 } else {
902 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
903 }
904 } else {
905 jio_fprintf(defaultStream::error_stream(),
906 "Unrecognized VM option '%s'\n", argname);
907 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
908 if (fuzzy_matched != NULL) {
909 jio_fprintf(defaultStream::error_stream(),
910 "Did you mean '%s%s%s'?\n",
911 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
912 fuzzy_matched->_name,
913 (fuzzy_matched->is_bool()) ? "" : "=<value>");
914 }
915 }
917 // allow for commandline "commenting out" options like -XX:#+Verbose
918 return arg[0] == '#';
919 }
921 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
922 FILE* stream = fopen(file_name, "rb");
923 if (stream == NULL) {
924 if (should_exist) {
925 jio_fprintf(defaultStream::error_stream(),
926 "Could not open settings file %s\n", file_name);
927 return false;
928 } else {
929 return true;
930 }
931 }
933 char token[1024];
934 int pos = 0;
936 bool in_white_space = true;
937 bool in_comment = false;
938 bool in_quote = false;
939 char quote_c = 0;
940 bool result = true;
942 int c = getc(stream);
943 while(c != EOF && pos < (int)(sizeof(token)-1)) {
944 if (in_white_space) {
945 if (in_comment) {
946 if (c == '\n') in_comment = false;
947 } else {
948 if (c == '#') in_comment = true;
949 else if (!isspace(c)) {
950 in_white_space = false;
951 token[pos++] = c;
952 }
953 }
954 } else {
955 if (c == '\n' || (!in_quote && isspace(c))) {
956 // token ends at newline, or at unquoted whitespace
957 // this allows a way to include spaces in string-valued options
958 token[pos] = '\0';
959 logOption(token);
960 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
961 build_jvm_flags(token);
962 pos = 0;
963 in_white_space = true;
964 in_quote = false;
965 } else if (!in_quote && (c == '\'' || c == '"')) {
966 in_quote = true;
967 quote_c = c;
968 } else if (in_quote && (c == quote_c)) {
969 in_quote = false;
970 } else {
971 token[pos++] = c;
972 }
973 }
974 c = getc(stream);
975 }
976 if (pos > 0) {
977 token[pos] = '\0';
978 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
979 build_jvm_flags(token);
980 }
981 fclose(stream);
982 return result;
983 }
985 //=============================================================================================================
986 // Parsing of properties (-D)
988 const char* Arguments::get_property(const char* key) {
989 return PropertyList_get_value(system_properties(), key);
990 }
992 bool Arguments::add_property(const char* prop) {
993 const char* eq = strchr(prop, '=');
994 char* key;
995 // ns must be static--its address may be stored in a SystemProperty object.
996 const static char ns[1] = {0};
997 char* value = (char *)ns;
999 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1000 key = AllocateHeap(key_len + 1, mtInternal);
1001 strncpy(key, prop, key_len);
1002 key[key_len] = '\0';
1004 if (eq != NULL) {
1005 size_t value_len = strlen(prop) - key_len - 1;
1006 value = AllocateHeap(value_len + 1, mtInternal);
1007 strncpy(value, &prop[key_len + 1], value_len + 1);
1008 }
1010 if (strcmp(key, "java.compiler") == 0) {
1011 process_java_compiler_argument(value);
1012 FreeHeap(key);
1013 if (eq != NULL) {
1014 FreeHeap(value);
1015 }
1016 return true;
1017 } else if (strcmp(key, "sun.java.command") == 0) {
1018 _java_command = value;
1020 // Record value in Arguments, but let it get passed to Java.
1021 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1022 // launcher.pid property is private and is processed
1023 // in process_sun_java_launcher_properties();
1024 // the sun.java.launcher property is passed on to the java application
1025 FreeHeap(key);
1026 if (eq != NULL) {
1027 FreeHeap(value);
1028 }
1029 return true;
1030 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1031 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1032 // its value without going through the property list or making a Java call.
1033 _java_vendor_url_bug = value;
1034 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1035 PropertyList_unique_add(&_system_properties, key, value, true);
1036 return true;
1037 }
1038 // Create new property and add at the end of the list
1039 PropertyList_unique_add(&_system_properties, key, value);
1040 return true;
1041 }
1043 //===========================================================================================================
1044 // Setting int/mixed/comp mode flags
1046 void Arguments::set_mode_flags(Mode mode) {
1047 // Set up default values for all flags.
1048 // If you add a flag to any of the branches below,
1049 // add a default value for it here.
1050 set_java_compiler(false);
1051 _mode = mode;
1053 // Ensure Agent_OnLoad has the correct initial values.
1054 // This may not be the final mode; mode may change later in onload phase.
1055 PropertyList_unique_add(&_system_properties, "java.vm.info",
1056 (char*)VM_Version::vm_info_string(), false);
1058 UseInterpreter = true;
1059 UseCompiler = true;
1060 UseLoopCounter = true;
1062 #ifndef ZERO
1063 // Turn these off for mixed and comp. Leave them on for Zero.
1064 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1065 UseFastAccessorMethods = (mode == _int);
1066 }
1067 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1068 UseFastEmptyMethods = (mode == _int);
1069 }
1070 #endif
1072 // Default values may be platform/compiler dependent -
1073 // use the saved values
1074 ClipInlining = Arguments::_ClipInlining;
1075 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1076 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1077 BackgroundCompilation = Arguments::_BackgroundCompilation;
1079 // Change from defaults based on mode
1080 switch (mode) {
1081 default:
1082 ShouldNotReachHere();
1083 break;
1084 case _int:
1085 UseCompiler = false;
1086 UseLoopCounter = false;
1087 AlwaysCompileLoopMethods = false;
1088 UseOnStackReplacement = false;
1089 break;
1090 case _mixed:
1091 // same as default
1092 break;
1093 case _comp:
1094 UseInterpreter = false;
1095 BackgroundCompilation = false;
1096 ClipInlining = false;
1097 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1098 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1099 // compile a level 4 (C2) and then continue executing it.
1100 if (TieredCompilation) {
1101 Tier3InvokeNotifyFreqLog = 0;
1102 Tier4InvocationThreshold = 0;
1103 }
1104 break;
1105 }
1106 }
1108 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1109 // Conflict: required to use shared spaces (-Xshare:on), but
1110 // incompatible command line options were chosen.
1112 static void no_shared_spaces() {
1113 if (RequireSharedSpaces) {
1114 jio_fprintf(defaultStream::error_stream(),
1115 "Class data sharing is inconsistent with other specified options.\n");
1116 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1117 } else {
1118 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1119 }
1120 }
1121 #endif
1123 void Arguments::set_tiered_flags() {
1124 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1125 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1126 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1127 }
1128 if (CompilationPolicyChoice < 2) {
1129 vm_exit_during_initialization(
1130 "Incompatible compilation policy selected", NULL);
1131 }
1132 // Increase the code cache size - tiered compiles a lot more.
1133 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1134 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1135 }
1136 if (!UseInterpreter) { // -Xcomp
1137 Tier3InvokeNotifyFreqLog = 0;
1138 Tier4InvocationThreshold = 0;
1139 }
1140 }
1142 #if INCLUDE_ALL_GCS
1143 static void disable_adaptive_size_policy(const char* collector_name) {
1144 if (UseAdaptiveSizePolicy) {
1145 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1146 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1147 collector_name);
1148 }
1149 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1150 }
1151 }
1153 void Arguments::set_parnew_gc_flags() {
1154 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1155 "control point invariant");
1156 assert(UseParNewGC, "Error");
1158 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1159 disable_adaptive_size_policy("UseParNewGC");
1161 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1162 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1163 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1164 } else if (ParallelGCThreads == 0) {
1165 jio_fprintf(defaultStream::error_stream(),
1166 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1167 vm_exit(1);
1168 }
1170 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1171 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1172 // we set them to 1024 and 1024.
1173 // See CR 6362902.
1174 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1175 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1176 }
1177 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1178 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1179 }
1181 // AlwaysTenure flag should make ParNew promote all at first collection.
1182 // See CR 6362902.
1183 if (AlwaysTenure) {
1184 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1185 }
1186 // When using compressed oops, we use local overflow stacks,
1187 // rather than using a global overflow list chained through
1188 // the klass word of the object's pre-image.
1189 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1190 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1191 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1192 }
1193 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1194 }
1195 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1196 }
1198 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1199 // sparc/solaris for certain applications, but would gain from
1200 // further optimization and tuning efforts, and would almost
1201 // certainly gain from analysis of platform and environment.
1202 void Arguments::set_cms_and_parnew_gc_flags() {
1203 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1204 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1206 // If we are using CMS, we prefer to UseParNewGC,
1207 // unless explicitly forbidden.
1208 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1209 FLAG_SET_ERGO(bool, UseParNewGC, true);
1210 }
1212 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1213 disable_adaptive_size_policy("UseConcMarkSweepGC");
1215 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1216 // as needed.
1217 if (UseParNewGC) {
1218 set_parnew_gc_flags();
1219 }
1221 size_t max_heap = align_size_down(MaxHeapSize,
1222 CardTableRS::ct_max_alignment_constraint());
1224 // Now make adjustments for CMS
1225 intx tenuring_default = (intx)6;
1226 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1228 // Preferred young gen size for "short" pauses:
1229 // upper bound depends on # of threads and NewRatio.
1230 const uintx parallel_gc_threads =
1231 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1232 const size_t preferred_max_new_size_unaligned =
1233 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1234 size_t preferred_max_new_size =
1235 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1237 // Unless explicitly requested otherwise, size young gen
1238 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1240 // If either MaxNewSize or NewRatio is set on the command line,
1241 // assume the user is trying to set the size of the young gen.
1242 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1244 // Set MaxNewSize to our calculated preferred_max_new_size unless
1245 // NewSize was set on the command line and it is larger than
1246 // preferred_max_new_size.
1247 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1248 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1249 } else {
1250 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1251 }
1252 if (PrintGCDetails && Verbose) {
1253 // Too early to use gclog_or_tty
1254 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1255 }
1257 // Code along this path potentially sets NewSize and OldSize
1258 if (PrintGCDetails && Verbose) {
1259 // Too early to use gclog_or_tty
1260 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1261 " initial_heap_size: " SIZE_FORMAT
1262 " max_heap: " SIZE_FORMAT,
1263 min_heap_size(), InitialHeapSize, max_heap);
1264 }
1265 size_t min_new = preferred_max_new_size;
1266 if (FLAG_IS_CMDLINE(NewSize)) {
1267 min_new = NewSize;
1268 }
1269 if (max_heap > min_new && min_heap_size() > min_new) {
1270 // Unless explicitly requested otherwise, make young gen
1271 // at least min_new, and at most preferred_max_new_size.
1272 if (FLAG_IS_DEFAULT(NewSize)) {
1273 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1274 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1275 if (PrintGCDetails && Verbose) {
1276 // Too early to use gclog_or_tty
1277 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1278 }
1279 }
1280 // Unless explicitly requested otherwise, size old gen
1281 // so it's NewRatio x of NewSize.
1282 if (FLAG_IS_DEFAULT(OldSize)) {
1283 if (max_heap > NewSize) {
1284 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1285 if (PrintGCDetails && Verbose) {
1286 // Too early to use gclog_or_tty
1287 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1288 }
1289 }
1290 }
1291 }
1292 }
1293 // Unless explicitly requested otherwise, definitely
1294 // promote all objects surviving "tenuring_default" scavenges.
1295 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1296 FLAG_IS_DEFAULT(SurvivorRatio)) {
1297 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1298 }
1299 // If we decided above (or user explicitly requested)
1300 // `promote all' (via MaxTenuringThreshold := 0),
1301 // prefer minuscule survivor spaces so as not to waste
1302 // space for (non-existent) survivors
1303 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1304 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1305 }
1306 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1307 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1308 // This is done in order to make ParNew+CMS configuration to work
1309 // with YoungPLABSize and OldPLABSize options.
1310 // See CR 6362902.
1311 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1312 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1313 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1314 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1315 // the value (either from the command line or ergonomics) of
1316 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1317 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1318 } else {
1319 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1320 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1321 // we'll let it to take precedence.
1322 jio_fprintf(defaultStream::error_stream(),
1323 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1324 " options are specified for the CMS collector."
1325 " CMSParPromoteBlocksToClaim will take precedence.\n");
1326 }
1327 }
1328 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1329 // OldPLAB sizing manually turned off: Use a larger default setting,
1330 // unless it was manually specified. This is because a too-low value
1331 // will slow down scavenges.
1332 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1333 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1334 }
1335 }
1336 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1337 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1338 // If either of the static initialization defaults have changed, note this
1339 // modification.
1340 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1341 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1342 }
1343 if (PrintGCDetails && Verbose) {
1344 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1345 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1346 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1347 }
1348 }
1349 #endif // INCLUDE_ALL_GCS
1351 void set_object_alignment() {
1352 // Object alignment.
1353 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1354 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1355 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1356 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1357 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1358 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1360 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1361 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1363 // Oop encoding heap max
1364 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1366 #if INCLUDE_ALL_GCS
1367 // Set CMS global values
1368 CompactibleFreeListSpace::set_cms_values();
1369 #endif // INCLUDE_ALL_GCS
1370 }
1372 bool verify_object_alignment() {
1373 // Object alignment.
1374 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1375 jio_fprintf(defaultStream::error_stream(),
1376 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1377 (int)ObjectAlignmentInBytes);
1378 return false;
1379 }
1380 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1381 jio_fprintf(defaultStream::error_stream(),
1382 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1383 (int)ObjectAlignmentInBytes, BytesPerLong);
1384 return false;
1385 }
1386 // It does not make sense to have big object alignment
1387 // since a space lost due to alignment will be greater
1388 // then a saved space from compressed oops.
1389 if ((int)ObjectAlignmentInBytes > 256) {
1390 jio_fprintf(defaultStream::error_stream(),
1391 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1392 (int)ObjectAlignmentInBytes);
1393 return false;
1394 }
1395 // In case page size is very small.
1396 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1397 jio_fprintf(defaultStream::error_stream(),
1398 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1399 (int)ObjectAlignmentInBytes, os::vm_page_size());
1400 return false;
1401 }
1402 if(SurvivorAlignmentInBytes == 0) {
1403 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1404 } else {
1405 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1406 jio_fprintf(defaultStream::error_stream(),
1407 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1408 (int)SurvivorAlignmentInBytes);
1409 return false;
1410 }
1411 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1412 jio_fprintf(defaultStream::error_stream(),
1413 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1414 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1415 return false;
1416 }
1417 }
1418 return true;
1419 }
1421 size_t Arguments::max_heap_for_compressed_oops() {
1422 // Avoid sign flip.
1423 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1424 // We need to fit both the NULL page and the heap into the memory budget, while
1425 // keeping alignment constraints of the heap. To guarantee the latter, as the
1426 // NULL page is located before the heap, we pad the NULL page to the conservative
1427 // maximum alignment that the GC may ever impose upon the heap.
1428 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1429 _conservative_max_heap_alignment);
1431 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1432 NOT_LP64(ShouldNotReachHere(); return 0);
1433 }
1435 bool Arguments::should_auto_select_low_pause_collector() {
1436 if (UseAutoGCSelectPolicy &&
1437 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1438 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1439 if (PrintGCDetails) {
1440 // Cannot use gclog_or_tty yet.
1441 tty->print_cr("Automatic selection of the low pause collector"
1442 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1443 }
1444 return true;
1445 }
1446 return false;
1447 }
1449 void Arguments::set_use_compressed_oops() {
1450 #ifndef ZERO
1451 #ifdef _LP64
1452 // MaxHeapSize is not set up properly at this point, but
1453 // the only value that can override MaxHeapSize if we are
1454 // to use UseCompressedOops is InitialHeapSize.
1455 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1457 if (max_heap_size <= max_heap_for_compressed_oops()) {
1458 #if !defined(COMPILER1) || defined(TIERED)
1459 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1460 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1461 }
1462 #endif
1463 #ifdef _WIN64
1464 if (UseLargePages && UseCompressedOops) {
1465 // Cannot allocate guard pages for implicit checks in indexed addressing
1466 // mode, when large pages are specified on windows.
1467 // This flag could be switched ON if narrow oop base address is set to 0,
1468 // see code in Universe::initialize_heap().
1469 Universe::set_narrow_oop_use_implicit_null_checks(false);
1470 }
1471 #endif // _WIN64
1472 } else {
1473 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1474 warning("Max heap size too large for Compressed Oops");
1475 FLAG_SET_DEFAULT(UseCompressedOops, false);
1476 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1477 }
1478 }
1479 #endif // _LP64
1480 #endif // ZERO
1481 }
1484 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1485 // set_use_compressed_oops().
1486 void Arguments::set_use_compressed_klass_ptrs() {
1487 #ifndef ZERO
1488 #ifdef _LP64
1489 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1490 if (!UseCompressedOops) {
1491 if (UseCompressedClassPointers) {
1492 warning("UseCompressedClassPointers requires UseCompressedOops");
1493 }
1494 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1495 } else {
1496 // Turn on UseCompressedClassPointers too
1497 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1498 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1499 }
1500 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1501 if (UseCompressedClassPointers) {
1502 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1503 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1504 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1505 }
1506 }
1507 }
1508 #endif // _LP64
1509 #endif // !ZERO
1510 }
1512 void Arguments::set_conservative_max_heap_alignment() {
1513 // The conservative maximum required alignment for the heap is the maximum of
1514 // the alignments imposed by several sources: any requirements from the heap
1515 // itself, the collector policy and the maximum page size we may run the VM
1516 // with.
1517 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1518 #if INCLUDE_ALL_GCS
1519 if (UseParallelGC) {
1520 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1521 } else if (UseG1GC) {
1522 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1523 }
1524 #endif // INCLUDE_ALL_GCS
1525 _conservative_max_heap_alignment = MAX4(heap_alignment,
1526 (size_t)os::vm_allocation_granularity(),
1527 os::max_page_size(),
1528 CollectorPolicy::compute_heap_alignment());
1529 }
1531 void Arguments::set_ergonomics_flags() {
1533 if (os::is_server_class_machine()) {
1534 // If no other collector is requested explicitly,
1535 // let the VM select the collector based on
1536 // machine class and automatic selection policy.
1537 if (!UseSerialGC &&
1538 !UseConcMarkSweepGC &&
1539 !UseG1GC &&
1540 !UseParNewGC &&
1541 FLAG_IS_DEFAULT(UseParallelGC)) {
1542 if (should_auto_select_low_pause_collector()) {
1543 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1544 } else {
1545 FLAG_SET_ERGO(bool, UseParallelGC, true);
1546 }
1547 }
1548 }
1549 #ifdef COMPILER2
1550 // Shared spaces work fine with other GCs but causes bytecode rewriting
1551 // to be disabled, which hurts interpreter performance and decreases
1552 // server performance. When -server is specified, keep the default off
1553 // unless it is asked for. Future work: either add bytecode rewriting
1554 // at link time, or rewrite bytecodes in non-shared methods.
1555 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1556 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1557 no_shared_spaces();
1558 }
1559 #endif
1561 set_conservative_max_heap_alignment();
1563 #ifndef ZERO
1564 #ifdef _LP64
1565 set_use_compressed_oops();
1567 // set_use_compressed_klass_ptrs() must be called after calling
1568 // set_use_compressed_oops().
1569 set_use_compressed_klass_ptrs();
1571 // Also checks that certain machines are slower with compressed oops
1572 // in vm_version initialization code.
1573 #endif // _LP64
1574 #endif // !ZERO
1575 }
1577 void Arguments::set_parallel_gc_flags() {
1578 assert(UseParallelGC || UseParallelOldGC, "Error");
1579 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1580 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1581 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1582 }
1583 FLAG_SET_DEFAULT(UseParallelGC, true);
1585 // If no heap maximum was requested explicitly, use some reasonable fraction
1586 // of the physical memory, up to a maximum of 1GB.
1587 FLAG_SET_DEFAULT(ParallelGCThreads,
1588 Abstract_VM_Version::parallel_worker_threads());
1589 if (ParallelGCThreads == 0) {
1590 jio_fprintf(defaultStream::error_stream(),
1591 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1592 vm_exit(1);
1593 }
1595 if (UseAdaptiveSizePolicy) {
1596 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1597 // unless the user actually sets these flags.
1598 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1599 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1600 }
1601 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1602 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1603 }
1604 }
1606 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1607 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1608 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1609 // See CR 6362902 for details.
1610 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1611 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1612 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1613 }
1614 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1615 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1616 }
1617 }
1619 if (UseParallelOldGC) {
1620 // Par compact uses lower default values since they are treated as
1621 // minimums. These are different defaults because of the different
1622 // interpretation and are not ergonomically set.
1623 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1624 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1625 }
1626 }
1627 }
1629 void Arguments::set_g1_gc_flags() {
1630 assert(UseG1GC, "Error");
1631 #ifdef COMPILER1
1632 FastTLABRefill = false;
1633 #endif
1634 FLAG_SET_DEFAULT(ParallelGCThreads,
1635 Abstract_VM_Version::parallel_worker_threads());
1636 if (ParallelGCThreads == 0) {
1637 FLAG_SET_DEFAULT(ParallelGCThreads,
1638 Abstract_VM_Version::parallel_worker_threads());
1639 }
1641 // MarkStackSize will be set (if it hasn't been set by the user)
1642 // when concurrent marking is initialized.
1643 // Its value will be based upon the number of parallel marking threads.
1644 // But we do set the maximum mark stack size here.
1645 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1646 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1647 }
1649 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1650 // In G1, we want the default GC overhead goal to be higher than
1651 // say in PS. So we set it here to 10%. Otherwise the heap might
1652 // be expanded more aggressively than we would like it to. In
1653 // fact, even 10% seems to not be high enough in some cases
1654 // (especially small GC stress tests that the main thing they do
1655 // is allocation). We might consider increase it further.
1656 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1657 }
1659 if (PrintGCDetails && Verbose) {
1660 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1661 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1662 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1663 }
1664 }
1666 julong Arguments::limit_by_allocatable_memory(julong limit) {
1667 julong max_allocatable;
1668 julong result = limit;
1669 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1670 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1671 }
1672 return result;
1673 }
1675 void Arguments::set_heap_size() {
1676 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1677 // Deprecated flag
1678 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1679 }
1681 const julong phys_mem =
1682 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1683 : (julong)MaxRAM;
1685 // If the maximum heap size has not been set with -Xmx,
1686 // then set it as fraction of the size of physical memory,
1687 // respecting the maximum and minimum sizes of the heap.
1688 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1689 julong reasonable_max = phys_mem / MaxRAMFraction;
1691 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1692 // Small physical memory, so use a minimum fraction of it for the heap
1693 reasonable_max = phys_mem / MinRAMFraction;
1694 } else {
1695 // Not-small physical memory, so require a heap at least
1696 // as large as MaxHeapSize
1697 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1698 }
1699 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1700 // Limit the heap size to ErgoHeapSizeLimit
1701 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1702 }
1703 if (UseCompressedOops) {
1704 // Limit the heap size to the maximum possible when using compressed oops
1705 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1706 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1707 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1708 // but it should be not less than default MaxHeapSize.
1709 max_coop_heap -= HeapBaseMinAddress;
1710 }
1711 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1712 }
1713 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1715 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1716 // An initial heap size was specified on the command line,
1717 // so be sure that the maximum size is consistent. Done
1718 // after call to limit_by_allocatable_memory because that
1719 // method might reduce the allocation size.
1720 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1721 }
1723 if (PrintGCDetails && Verbose) {
1724 // Cannot use gclog_or_tty yet.
1725 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1726 }
1727 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1728 }
1730 // If the minimum or initial heap_size have not been set or requested to be set
1731 // ergonomically, set them accordingly.
1732 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1733 julong reasonable_minimum = (julong)(OldSize + NewSize);
1735 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1737 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1739 if (InitialHeapSize == 0) {
1740 julong reasonable_initial = phys_mem / InitialRAMFraction;
1742 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1743 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1745 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1747 if (PrintGCDetails && Verbose) {
1748 // Cannot use gclog_or_tty yet.
1749 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1750 }
1751 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1752 }
1753 // If the minimum heap size has not been set (via -Xms),
1754 // synchronize with InitialHeapSize to avoid errors with the default value.
1755 if (min_heap_size() == 0) {
1756 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1757 if (PrintGCDetails && Verbose) {
1758 // Cannot use gclog_or_tty yet.
1759 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1760 }
1761 }
1762 }
1763 }
1765 // This must be called after ergonomics because we want bytecode rewriting
1766 // if the server compiler is used, or if UseSharedSpaces is disabled.
1767 void Arguments::set_bytecode_flags() {
1768 // Better not attempt to store into a read-only space.
1769 if (UseSharedSpaces) {
1770 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1771 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1772 }
1774 if (!RewriteBytecodes) {
1775 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1776 }
1777 }
1779 // Aggressive optimization flags -XX:+AggressiveOpts
1780 void Arguments::set_aggressive_opts_flags() {
1781 #ifdef COMPILER2
1782 if (AggressiveUnboxing) {
1783 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1784 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1785 } else if (!EliminateAutoBox) {
1786 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1787 AggressiveUnboxing = false;
1788 }
1789 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1790 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1791 } else if (!DoEscapeAnalysis) {
1792 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1793 AggressiveUnboxing = false;
1794 }
1795 }
1796 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1797 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1798 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1799 }
1800 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1801 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1802 }
1804 // Feed the cache size setting into the JDK
1805 char buffer[1024];
1806 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1807 add_property(buffer);
1808 }
1809 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1810 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1811 }
1812 #endif
1814 if (AggressiveOpts) {
1815 // Sample flag setting code
1816 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1817 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1818 // }
1819 }
1820 }
1822 //===========================================================================================================
1823 // Parsing of java.compiler property
1825 void Arguments::process_java_compiler_argument(char* arg) {
1826 // For backwards compatibility, Djava.compiler=NONE or ""
1827 // causes us to switch to -Xint mode UNLESS -Xdebug
1828 // is also specified.
1829 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1830 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1831 }
1832 }
1834 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1835 _sun_java_launcher = strdup(launcher);
1836 if (strcmp("gamma", _sun_java_launcher) == 0) {
1837 _created_by_gamma_launcher = true;
1838 }
1839 }
1841 bool Arguments::created_by_java_launcher() {
1842 assert(_sun_java_launcher != NULL, "property must have value");
1843 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1844 }
1846 bool Arguments::created_by_gamma_launcher() {
1847 return _created_by_gamma_launcher;
1848 }
1850 //===========================================================================================================
1851 // Parsing of main arguments
1853 bool Arguments::verify_interval(uintx val, uintx min,
1854 uintx max, const char* name) {
1855 // Returns true iff value is in the inclusive interval [min..max]
1856 // false, otherwise.
1857 if (val >= min && val <= max) {
1858 return true;
1859 }
1860 jio_fprintf(defaultStream::error_stream(),
1861 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1862 " and " UINTX_FORMAT "\n",
1863 name, val, min, max);
1864 return false;
1865 }
1867 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1868 // Returns true if given value is at least specified min threshold
1869 // false, otherwise.
1870 if (val >= min ) {
1871 return true;
1872 }
1873 jio_fprintf(defaultStream::error_stream(),
1874 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1875 name, val, min);
1876 return false;
1877 }
1879 bool Arguments::verify_percentage(uintx value, const char* name) {
1880 if (is_percentage(value)) {
1881 return true;
1882 }
1883 jio_fprintf(defaultStream::error_stream(),
1884 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1885 name, value);
1886 return false;
1887 }
1889 #if !INCLUDE_ALL_GCS
1890 #ifdef ASSERT
1891 static bool verify_serial_gc_flags() {
1892 return (UseSerialGC &&
1893 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1894 UseParallelGC || UseParallelOldGC));
1895 }
1896 #endif // ASSERT
1897 #endif // INCLUDE_ALL_GCS
1899 // check if do gclog rotation
1900 // +UseGCLogFileRotation is a must,
1901 // no gc log rotation when log file not supplied or
1902 // NumberOfGCLogFiles is 0
1903 void check_gclog_consistency() {
1904 if (UseGCLogFileRotation) {
1905 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1906 jio_fprintf(defaultStream::output_stream(),
1907 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1908 "where num_of_file > 0\n"
1909 "GC log rotation is turned off\n");
1910 UseGCLogFileRotation = false;
1911 }
1912 }
1914 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1915 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1916 jio_fprintf(defaultStream::output_stream(),
1917 "GCLogFileSize changed to minimum 8K\n");
1918 }
1919 }
1921 // This function is called for -Xloggc:<filename>, it can be used
1922 // to check if a given file name(or string) conforms to the following
1923 // specification:
1924 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1925 // %p and %t only allowed once. We only limit usage of filename not path
1926 bool is_filename_valid(const char *file_name) {
1927 const char* p = file_name;
1928 char file_sep = os::file_separator()[0];
1929 const char* cp;
1930 // skip prefix path
1931 for (cp = file_name; *cp != '\0'; cp++) {
1932 if (*cp == '/' || *cp == file_sep) {
1933 p = cp + 1;
1934 }
1935 }
1937 int count_p = 0;
1938 int count_t = 0;
1939 while (*p != '\0') {
1940 if ((*p >= '0' && *p <= '9') ||
1941 (*p >= 'A' && *p <= 'Z') ||
1942 (*p >= 'a' && *p <= 'z') ||
1943 *p == '-' ||
1944 *p == '_' ||
1945 *p == '.') {
1946 p++;
1947 continue;
1948 }
1949 if (*p == '%') {
1950 if(*(p + 1) == 'p') {
1951 p += 2;
1952 count_p ++;
1953 continue;
1954 }
1955 if (*(p + 1) == 't') {
1956 p += 2;
1957 count_t ++;
1958 continue;
1959 }
1960 }
1961 return false;
1962 }
1963 return count_p < 2 && count_t < 2;
1964 }
1966 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
1967 if (!is_percentage(min_heap_free_ratio)) {
1968 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
1969 return false;
1970 }
1971 if (min_heap_free_ratio > MaxHeapFreeRatio) {
1972 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1973 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
1974 MaxHeapFreeRatio);
1975 return false;
1976 }
1977 return true;
1978 }
1980 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
1981 if (!is_percentage(max_heap_free_ratio)) {
1982 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
1983 return false;
1984 }
1985 if (max_heap_free_ratio < MinHeapFreeRatio) {
1986 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
1987 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
1988 MinHeapFreeRatio);
1989 return false;
1990 }
1991 return true;
1992 }
1994 // Check consistency of GC selection
1995 bool Arguments::check_gc_consistency() {
1996 check_gclog_consistency();
1997 bool status = true;
1998 // Ensure that the user has not selected conflicting sets
1999 // of collectors. [Note: this check is merely a user convenience;
2000 // collectors over-ride each other so that only a non-conflicting
2001 // set is selected; however what the user gets is not what they
2002 // may have expected from the combination they asked for. It's
2003 // better to reduce user confusion by not allowing them to
2004 // select conflicting combinations.
2005 uint i = 0;
2006 if (UseSerialGC) i++;
2007 if (UseConcMarkSweepGC || UseParNewGC) i++;
2008 if (UseParallelGC || UseParallelOldGC) i++;
2009 if (UseG1GC) i++;
2010 if (i > 1) {
2011 jio_fprintf(defaultStream::error_stream(),
2012 "Conflicting collector combinations in option list; "
2013 "please refer to the release notes for the combinations "
2014 "allowed\n");
2015 status = false;
2016 }
2017 return status;
2018 }
2020 void Arguments::check_deprecated_gcs() {
2021 if (UseConcMarkSweepGC && !UseParNewGC) {
2022 warning("Using the DefNew young collector with the CMS collector is deprecated "
2023 "and will likely be removed in a future release");
2024 }
2026 if (UseParNewGC && !UseConcMarkSweepGC) {
2027 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2028 // set up UseSerialGC properly, so that can't be used in the check here.
2029 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2030 "and will likely be removed in a future release");
2031 }
2033 if (CMSIncrementalMode) {
2034 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2035 }
2036 }
2038 void Arguments::check_deprecated_gc_flags() {
2039 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2040 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2041 "and will likely be removed in future release");
2042 }
2043 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2044 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2045 "Use MaxRAMFraction instead.");
2046 }
2047 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2048 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2049 }
2050 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2051 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2052 }
2053 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2054 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2055 }
2056 }
2058 // Check stack pages settings
2059 bool Arguments::check_stack_pages()
2060 {
2061 bool status = true;
2062 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2063 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2064 // greater stack shadow pages can't generate instruction to bang stack
2065 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2066 return status;
2067 }
2069 // Check the consistency of vm_init_args
2070 bool Arguments::check_vm_args_consistency() {
2071 // Method for adding checks for flag consistency.
2072 // The intent is to warn the user of all possible conflicts,
2073 // before returning an error.
2074 // Note: Needs platform-dependent factoring.
2075 bool status = true;
2077 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2078 // builds so the cost of stack banging can be measured.
2079 #if (defined(PRODUCT) && defined(SOLARIS))
2080 if (!UseBoundThreads && !UseStackBanging) {
2081 jio_fprintf(defaultStream::error_stream(),
2082 "-UseStackBanging conflicts with -UseBoundThreads\n");
2084 status = false;
2085 }
2086 #endif
2088 if (TLABRefillWasteFraction == 0) {
2089 jio_fprintf(defaultStream::error_stream(),
2090 "TLABRefillWasteFraction should be a denominator, "
2091 "not " SIZE_FORMAT "\n",
2092 TLABRefillWasteFraction);
2093 status = false;
2094 }
2096 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2097 "AdaptiveSizePolicyWeight");
2098 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2100 // Divide by bucket size to prevent a large size from causing rollover when
2101 // calculating amount of memory needed to be allocated for the String table.
2102 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2103 (max_uintx / StringTable::bucket_size()), "StringTable size");
2105 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2106 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2108 {
2109 // Using "else if" below to avoid printing two error messages if min > max.
2110 // This will also prevent us from reporting both min>100 and max>100 at the
2111 // same time, but that is less annoying than printing two identical errors IMHO.
2112 FormatBuffer<80> err_msg("%s","");
2113 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2114 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2115 status = false;
2116 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2117 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2118 status = false;
2119 }
2120 }
2122 // Min/MaxMetaspaceFreeRatio
2123 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2124 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2126 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2127 jio_fprintf(defaultStream::error_stream(),
2128 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2129 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2130 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2131 MinMetaspaceFreeRatio,
2132 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2133 MaxMetaspaceFreeRatio);
2134 status = false;
2135 }
2137 // Trying to keep 100% free is not practical
2138 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2140 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2141 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2142 }
2144 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2145 // Settings to encourage splitting.
2146 if (!FLAG_IS_CMDLINE(NewRatio)) {
2147 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2148 }
2149 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2150 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2151 }
2152 }
2154 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2155 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2156 if (GCTimeLimit == 100) {
2157 // Turn off gc-overhead-limit-exceeded checks
2158 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2159 }
2161 status = status && check_gc_consistency();
2162 status = status && check_stack_pages();
2164 if (CMSIncrementalMode) {
2165 if (!UseConcMarkSweepGC) {
2166 jio_fprintf(defaultStream::error_stream(),
2167 "error: invalid argument combination.\n"
2168 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2169 "selected in order\nto use CMSIncrementalMode.\n");
2170 status = false;
2171 } else {
2172 status = status && verify_percentage(CMSIncrementalDutyCycle,
2173 "CMSIncrementalDutyCycle");
2174 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2175 "CMSIncrementalDutyCycleMin");
2176 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2177 "CMSIncrementalSafetyFactor");
2178 status = status && verify_percentage(CMSIncrementalOffset,
2179 "CMSIncrementalOffset");
2180 status = status && verify_percentage(CMSExpAvgFactor,
2181 "CMSExpAvgFactor");
2182 // If it was not set on the command line, set
2183 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2184 if (CMSInitiatingOccupancyFraction < 0) {
2185 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2186 }
2187 }
2188 }
2190 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2191 // insists that we hold the requisite locks so that the iteration is
2192 // MT-safe. For the verification at start-up and shut-down, we don't
2193 // yet have a good way of acquiring and releasing these locks,
2194 // which are not visible at the CollectedHeap level. We want to
2195 // be able to acquire these locks and then do the iteration rather
2196 // than just disable the lock verification. This will be fixed under
2197 // bug 4788986.
2198 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2199 if (VerifyDuringStartup) {
2200 warning("Heap verification at start-up disabled "
2201 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2202 VerifyDuringStartup = false; // Disable verification at start-up
2203 }
2205 if (VerifyBeforeExit) {
2206 warning("Heap verification at shutdown disabled "
2207 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2208 VerifyBeforeExit = false; // Disable verification at shutdown
2209 }
2210 }
2212 // Note: only executed in non-PRODUCT mode
2213 if (!UseAsyncConcMarkSweepGC &&
2214 (ExplicitGCInvokesConcurrent ||
2215 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2216 jio_fprintf(defaultStream::error_stream(),
2217 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2218 " with -UseAsyncConcMarkSweepGC");
2219 status = false;
2220 }
2222 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2224 #if INCLUDE_ALL_GCS
2225 if (UseG1GC) {
2226 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2227 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2228 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2230 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2231 "InitiatingHeapOccupancyPercent");
2232 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2233 "G1RefProcDrainInterval");
2234 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2235 "G1ConcMarkStepDurationMillis");
2236 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2237 "G1ConcRSHotCardLimit");
2238 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2239 "G1ConcRSLogCacheSize");
2240 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2241 "StringDeduplicationAgeThreshold");
2242 }
2243 if (UseConcMarkSweepGC) {
2244 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2245 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2246 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2247 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2249 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2251 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2252 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2253 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2255 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2257 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2258 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2260 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2261 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2262 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2264 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2266 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2268 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2269 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2270 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2271 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2272 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2273 }
2275 if (UseParallelGC || UseParallelOldGC) {
2276 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2277 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2279 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2280 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2282 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2283 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2285 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2287 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2288 }
2289 #endif // INCLUDE_ALL_GCS
2291 status = status && verify_interval(RefDiscoveryPolicy,
2292 ReferenceProcessor::DiscoveryPolicyMin,
2293 ReferenceProcessor::DiscoveryPolicyMax,
2294 "RefDiscoveryPolicy");
2296 // Limit the lower bound of this flag to 1 as it is used in a division
2297 // expression.
2298 status = status && verify_interval(TLABWasteTargetPercent,
2299 1, 100, "TLABWasteTargetPercent");
2301 status = status && verify_object_alignment();
2303 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2304 "CompressedClassSpaceSize");
2306 status = status && verify_interval(MarkStackSizeMax,
2307 1, (max_jint - 1), "MarkStackSizeMax");
2308 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2310 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2312 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2314 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2316 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2317 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2319 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2321 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2322 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2323 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2324 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2326 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2327 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2329 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2330 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2331 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2333 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2334 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2336 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2337 // just for that, so hardcode here.
2338 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2339 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2340 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2341 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2343 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2345 if (PrintNMTStatistics) {
2346 #if INCLUDE_NMT
2347 if (MemTracker::tracking_level() == NMT_off) {
2348 #endif // INCLUDE_NMT
2349 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2350 PrintNMTStatistics = false;
2351 #if INCLUDE_NMT
2352 }
2353 #endif
2354 }
2356 // Need to limit the extent of the padding to reasonable size.
2357 // 8K is well beyond the reasonable HW cache line size, even with the
2358 // aggressive prefetching, while still leaving the room for segregating
2359 // among the distinct pages.
2360 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2361 jio_fprintf(defaultStream::error_stream(),
2362 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2363 ContendedPaddingWidth, 0, 8192);
2364 status = false;
2365 }
2367 // Need to enforce the padding not to break the existing field alignments.
2368 // It is sufficient to check against the largest type size.
2369 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2370 jio_fprintf(defaultStream::error_stream(),
2371 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2372 ContendedPaddingWidth, BytesPerLong);
2373 status = false;
2374 }
2376 // Check lower bounds of the code cache
2377 // Template Interpreter code is approximately 3X larger in debug builds.
2378 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2379 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2380 jio_fprintf(defaultStream::error_stream(),
2381 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2382 os::vm_page_size()/K);
2383 status = false;
2384 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2385 jio_fprintf(defaultStream::error_stream(),
2386 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2387 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2388 status = false;
2389 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2390 jio_fprintf(defaultStream::error_stream(),
2391 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2392 min_code_cache_size/K);
2393 status = false;
2394 } else if (ReservedCodeCacheSize > 2*G) {
2395 // Code cache size larger than MAXINT is not supported.
2396 jio_fprintf(defaultStream::error_stream(),
2397 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2398 (2*G)/M);
2399 status = false;
2400 }
2402 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2403 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2405 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2406 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2407 }
2409 status &= check_vm_args_consistency_ext();
2411 return status;
2412 }
2414 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2415 const char* option_type) {
2416 if (ignore) return false;
2418 const char* spacer = " ";
2419 if (option_type == NULL) {
2420 option_type = ++spacer; // Set both to the empty string.
2421 }
2423 if (os::obsolete_option(option)) {
2424 jio_fprintf(defaultStream::error_stream(),
2425 "Obsolete %s%soption: %s\n", option_type, spacer,
2426 option->optionString);
2427 return false;
2428 } else {
2429 jio_fprintf(defaultStream::error_stream(),
2430 "Unrecognized %s%soption: %s\n", option_type, spacer,
2431 option->optionString);
2432 return true;
2433 }
2434 }
2436 static const char* user_assertion_options[] = {
2437 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2438 };
2440 static const char* system_assertion_options[] = {
2441 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2442 };
2444 // Return true if any of the strings in null-terminated array 'names' matches.
2445 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2446 // the option must match exactly.
2447 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2448 bool tail_allowed) {
2449 for (/* empty */; *names != NULL; ++names) {
2450 if (match_option(option, *names, tail)) {
2451 if (**tail == '\0' || tail_allowed && **tail == ':') {
2452 return true;
2453 }
2454 }
2455 }
2456 return false;
2457 }
2459 bool Arguments::parse_uintx(const char* value,
2460 uintx* uintx_arg,
2461 uintx min_size) {
2463 // Check the sign first since atomull() parses only unsigned values.
2464 bool value_is_positive = !(*value == '-');
2466 if (value_is_positive) {
2467 julong n;
2468 bool good_return = atomull(value, &n);
2469 if (good_return) {
2470 bool above_minimum = n >= min_size;
2471 bool value_is_too_large = n > max_uintx;
2473 if (above_minimum && !value_is_too_large) {
2474 *uintx_arg = n;
2475 return true;
2476 }
2477 }
2478 }
2479 return false;
2480 }
2482 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2483 julong* long_arg,
2484 julong min_size) {
2485 if (!atomull(s, long_arg)) return arg_unreadable;
2486 return check_memory_size(*long_arg, min_size);
2487 }
2489 // Parse JavaVMInitArgs structure
2491 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2492 // For components of the system classpath.
2493 SysClassPath scp(Arguments::get_sysclasspath());
2494 bool scp_assembly_required = false;
2496 // Save default settings for some mode flags
2497 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2498 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2499 Arguments::_ClipInlining = ClipInlining;
2500 Arguments::_BackgroundCompilation = BackgroundCompilation;
2502 // Setup flags for mixed which is the default
2503 set_mode_flags(_mixed);
2505 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2506 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2507 if (result != JNI_OK) {
2508 return result;
2509 }
2511 // Parse JavaVMInitArgs structure passed in
2512 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2513 if (result != JNI_OK) {
2514 return result;
2515 }
2517 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2518 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2519 if (result != JNI_OK) {
2520 return result;
2521 }
2523 // Do final processing now that all arguments have been parsed
2524 result = finalize_vm_init_args(&scp, scp_assembly_required);
2525 if (result != JNI_OK) {
2526 return result;
2527 }
2529 return JNI_OK;
2530 }
2532 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2533 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2534 // are dealing with -agentpath (case where name is a path), otherwise with
2535 // -agentlib
2536 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2537 char *_name;
2538 const char *_hprof = "hprof", *_jdwp = "jdwp";
2539 size_t _len_hprof, _len_jdwp, _len_prefix;
2541 if (is_path) {
2542 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2543 return false;
2544 }
2546 _name++; // skip past last path separator
2547 _len_prefix = strlen(JNI_LIB_PREFIX);
2549 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2550 return false;
2551 }
2553 _name += _len_prefix;
2554 _len_hprof = strlen(_hprof);
2555 _len_jdwp = strlen(_jdwp);
2557 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2558 _name += _len_hprof;
2559 }
2560 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2561 _name += _len_jdwp;
2562 }
2563 else {
2564 return false;
2565 }
2567 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2568 return false;
2569 }
2571 return true;
2572 }
2574 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2575 return true;
2576 }
2578 return false;
2579 }
2581 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2582 SysClassPath* scp_p,
2583 bool* scp_assembly_required_p,
2584 Flag::Flags origin) {
2585 // Remaining part of option string
2586 const char* tail;
2588 // iterate over arguments
2589 for (int index = 0; index < args->nOptions; index++) {
2590 bool is_absolute_path = false; // for -agentpath vs -agentlib
2592 const JavaVMOption* option = args->options + index;
2594 if (!match_option(option, "-Djava.class.path", &tail) &&
2595 !match_option(option, "-Dsun.java.command", &tail) &&
2596 !match_option(option, "-Dsun.java.launcher", &tail)) {
2598 // add all jvm options to the jvm_args string. This string
2599 // is used later to set the java.vm.args PerfData string constant.
2600 // the -Djava.class.path and the -Dsun.java.command options are
2601 // omitted from jvm_args string as each have their own PerfData
2602 // string constant object.
2603 build_jvm_args(option->optionString);
2604 }
2606 // -verbose:[class/gc/jni]
2607 if (match_option(option, "-verbose", &tail)) {
2608 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2609 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2610 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2611 } else if (!strcmp(tail, ":gc")) {
2612 FLAG_SET_CMDLINE(bool, PrintGC, true);
2613 } else if (!strcmp(tail, ":jni")) {
2614 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2615 }
2616 // -da / -ea / -disableassertions / -enableassertions
2617 // These accept an optional class/package name separated by a colon, e.g.,
2618 // -da:java.lang.Thread.
2619 } else if (match_option(option, user_assertion_options, &tail, true)) {
2620 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2621 if (*tail == '\0') {
2622 JavaAssertions::setUserClassDefault(enable);
2623 } else {
2624 assert(*tail == ':', "bogus match by match_option()");
2625 JavaAssertions::addOption(tail + 1, enable);
2626 }
2627 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2628 } else if (match_option(option, system_assertion_options, &tail, false)) {
2629 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2630 JavaAssertions::setSystemClassDefault(enable);
2631 // -bootclasspath:
2632 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2633 scp_p->reset_path(tail);
2634 *scp_assembly_required_p = true;
2635 // -bootclasspath/a:
2636 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2637 scp_p->add_suffix(tail);
2638 *scp_assembly_required_p = true;
2639 // -bootclasspath/p:
2640 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2641 scp_p->add_prefix(tail);
2642 *scp_assembly_required_p = true;
2643 // -Xrun
2644 } else if (match_option(option, "-Xrun", &tail)) {
2645 if (tail != NULL) {
2646 const char* pos = strchr(tail, ':');
2647 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2648 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2649 name[len] = '\0';
2651 char *options = NULL;
2652 if(pos != NULL) {
2653 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2654 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2655 }
2656 #if !INCLUDE_JVMTI
2657 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2658 jio_fprintf(defaultStream::error_stream(),
2659 "Profiling and debugging agents are not supported in this VM\n");
2660 return JNI_ERR;
2661 }
2662 #endif // !INCLUDE_JVMTI
2663 add_init_library(name, options);
2664 }
2665 // -agentlib and -agentpath
2666 } else if (match_option(option, "-agentlib:", &tail) ||
2667 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2668 if(tail != NULL) {
2669 const char* pos = strchr(tail, '=');
2670 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2671 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2672 name[len] = '\0';
2674 char *options = NULL;
2675 if(pos != NULL) {
2676 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2677 }
2678 #if !INCLUDE_JVMTI
2679 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2680 jio_fprintf(defaultStream::error_stream(),
2681 "Profiling and debugging agents are not supported in this VM\n");
2682 return JNI_ERR;
2683 }
2684 #endif // !INCLUDE_JVMTI
2685 add_init_agent(name, options, is_absolute_path);
2686 }
2687 // -javaagent
2688 } else if (match_option(option, "-javaagent:", &tail)) {
2689 #if !INCLUDE_JVMTI
2690 jio_fprintf(defaultStream::error_stream(),
2691 "Instrumentation agents are not supported in this VM\n");
2692 return JNI_ERR;
2693 #else
2694 if(tail != NULL) {
2695 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2696 add_init_agent("instrument", options, false);
2697 }
2698 #endif // !INCLUDE_JVMTI
2699 // -Xnoclassgc
2700 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2701 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2702 // -Xincgc: i-CMS
2703 } else if (match_option(option, "-Xincgc", &tail)) {
2704 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2705 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2706 // -Xnoincgc: no i-CMS
2707 } else if (match_option(option, "-Xnoincgc", &tail)) {
2708 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2709 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2710 // -Xconcgc
2711 } else if (match_option(option, "-Xconcgc", &tail)) {
2712 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2713 // -Xnoconcgc
2714 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2715 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2716 // -Xbatch
2717 } else if (match_option(option, "-Xbatch", &tail)) {
2718 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2719 // -Xmn for compatibility with other JVM vendors
2720 } else if (match_option(option, "-Xmn", &tail)) {
2721 julong long_initial_young_size = 0;
2722 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2723 if (errcode != arg_in_range) {
2724 jio_fprintf(defaultStream::error_stream(),
2725 "Invalid initial young generation size: %s\n", option->optionString);
2726 describe_range_error(errcode);
2727 return JNI_EINVAL;
2728 }
2729 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2730 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2731 // -Xms
2732 } else if (match_option(option, "-Xms", &tail)) {
2733 julong long_initial_heap_size = 0;
2734 // an initial heap size of 0 means automatically determine
2735 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2736 if (errcode != arg_in_range) {
2737 jio_fprintf(defaultStream::error_stream(),
2738 "Invalid initial heap size: %s\n", option->optionString);
2739 describe_range_error(errcode);
2740 return JNI_EINVAL;
2741 }
2742 set_min_heap_size((uintx)long_initial_heap_size);
2743 // Currently the minimum size and the initial heap sizes are the same.
2744 // Can be overridden with -XX:InitialHeapSize.
2745 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2746 // -Xmx
2747 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2748 julong long_max_heap_size = 0;
2749 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2750 if (errcode != arg_in_range) {
2751 jio_fprintf(defaultStream::error_stream(),
2752 "Invalid maximum heap size: %s\n", option->optionString);
2753 describe_range_error(errcode);
2754 return JNI_EINVAL;
2755 }
2756 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2757 // Xmaxf
2758 } else if (match_option(option, "-Xmaxf", &tail)) {
2759 char* err;
2760 int maxf = (int)(strtod(tail, &err) * 100);
2761 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2762 jio_fprintf(defaultStream::error_stream(),
2763 "Bad max heap free percentage size: %s\n",
2764 option->optionString);
2765 return JNI_EINVAL;
2766 } else {
2767 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2768 }
2769 // Xminf
2770 } else if (match_option(option, "-Xminf", &tail)) {
2771 char* err;
2772 int minf = (int)(strtod(tail, &err) * 100);
2773 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2774 jio_fprintf(defaultStream::error_stream(),
2775 "Bad min heap free percentage size: %s\n",
2776 option->optionString);
2777 return JNI_EINVAL;
2778 } else {
2779 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2780 }
2781 // -Xss
2782 } else if (match_option(option, "-Xss", &tail)) {
2783 julong long_ThreadStackSize = 0;
2784 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2785 if (errcode != arg_in_range) {
2786 jio_fprintf(defaultStream::error_stream(),
2787 "Invalid thread stack size: %s\n", option->optionString);
2788 describe_range_error(errcode);
2789 return JNI_EINVAL;
2790 }
2791 // Internally track ThreadStackSize in units of 1024 bytes.
2792 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2793 round_to((int)long_ThreadStackSize, K) / K);
2794 // -Xoss
2795 } else if (match_option(option, "-Xoss", &tail)) {
2796 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2797 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2798 julong long_CodeCacheExpansionSize = 0;
2799 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2800 if (errcode != arg_in_range) {
2801 jio_fprintf(defaultStream::error_stream(),
2802 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2803 os::vm_page_size()/K);
2804 return JNI_EINVAL;
2805 }
2806 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2807 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2808 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2809 julong long_ReservedCodeCacheSize = 0;
2811 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2812 if (errcode != arg_in_range) {
2813 jio_fprintf(defaultStream::error_stream(),
2814 "Invalid maximum code cache size: %s.\n", option->optionString);
2815 return JNI_EINVAL;
2816 }
2817 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2818 //-XX:IncreaseFirstTierCompileThresholdAt=
2819 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2820 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2821 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2822 jio_fprintf(defaultStream::error_stream(),
2823 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2824 option->optionString);
2825 return JNI_EINVAL;
2826 }
2827 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2828 // -green
2829 } else if (match_option(option, "-green", &tail)) {
2830 jio_fprintf(defaultStream::error_stream(),
2831 "Green threads support not available\n");
2832 return JNI_EINVAL;
2833 // -native
2834 } else if (match_option(option, "-native", &tail)) {
2835 // HotSpot always uses native threads, ignore silently for compatibility
2836 // -Xsqnopause
2837 } else if (match_option(option, "-Xsqnopause", &tail)) {
2838 // EVM option, ignore silently for compatibility
2839 // -Xrs
2840 } else if (match_option(option, "-Xrs", &tail)) {
2841 // Classic/EVM option, new functionality
2842 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2843 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2844 // change default internal VM signals used - lower case for back compat
2845 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2846 // -Xoptimize
2847 } else if (match_option(option, "-Xoptimize", &tail)) {
2848 // EVM option, ignore silently for compatibility
2849 // -Xprof
2850 } else if (match_option(option, "-Xprof", &tail)) {
2851 #if INCLUDE_FPROF
2852 _has_profile = true;
2853 #else // INCLUDE_FPROF
2854 jio_fprintf(defaultStream::error_stream(),
2855 "Flat profiling is not supported in this VM.\n");
2856 return JNI_ERR;
2857 #endif // INCLUDE_FPROF
2858 // -Xconcurrentio
2859 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2860 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2861 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2862 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2863 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2864 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2866 // -Xinternalversion
2867 } else if (match_option(option, "-Xinternalversion", &tail)) {
2868 jio_fprintf(defaultStream::output_stream(), "%s\n",
2869 VM_Version::internal_vm_info_string());
2870 vm_exit(0);
2871 #ifndef PRODUCT
2872 // -Xprintflags
2873 } else if (match_option(option, "-Xprintflags", &tail)) {
2874 CommandLineFlags::printFlags(tty, false);
2875 vm_exit(0);
2876 #endif
2877 // -D
2878 } else if (match_option(option, "-D", &tail)) {
2879 if (!add_property(tail)) {
2880 return JNI_ENOMEM;
2881 }
2882 // Out of the box management support
2883 if (match_option(option, "-Dcom.sun.management", &tail)) {
2884 #if INCLUDE_MANAGEMENT
2885 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2886 #else
2887 jio_fprintf(defaultStream::output_stream(),
2888 "-Dcom.sun.management is not supported in this VM.\n");
2889 return JNI_ERR;
2890 #endif
2891 }
2892 // -Xint
2893 } else if (match_option(option, "-Xint", &tail)) {
2894 set_mode_flags(_int);
2895 // -Xmixed
2896 } else if (match_option(option, "-Xmixed", &tail)) {
2897 set_mode_flags(_mixed);
2898 // -Xcomp
2899 } else if (match_option(option, "-Xcomp", &tail)) {
2900 // for testing the compiler; turn off all flags that inhibit compilation
2901 set_mode_flags(_comp);
2902 // -Xshare:dump
2903 } else if (match_option(option, "-Xshare:dump", &tail)) {
2904 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2905 set_mode_flags(_int); // Prevent compilation, which creates objects
2906 // -Xshare:on
2907 } else if (match_option(option, "-Xshare:on", &tail)) {
2908 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2909 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2910 // -Xshare:auto
2911 } else if (match_option(option, "-Xshare:auto", &tail)) {
2912 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2913 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2914 // -Xshare:off
2915 } else if (match_option(option, "-Xshare:off", &tail)) {
2916 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2917 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2918 // -Xverify
2919 } else if (match_option(option, "-Xverify", &tail)) {
2920 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2921 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2922 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2923 } else if (strcmp(tail, ":remote") == 0) {
2924 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2925 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2926 } else if (strcmp(tail, ":none") == 0) {
2927 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2928 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2929 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2930 return JNI_EINVAL;
2931 }
2932 // -Xdebug
2933 } else if (match_option(option, "-Xdebug", &tail)) {
2934 // note this flag has been used, then ignore
2935 set_xdebug_mode(true);
2936 // -Xnoagent
2937 } else if (match_option(option, "-Xnoagent", &tail)) {
2938 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2939 } else if (match_option(option, "-Xboundthreads", &tail)) {
2940 // Bind user level threads to kernel threads (Solaris only)
2941 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2942 } else if (match_option(option, "-Xloggc:", &tail)) {
2943 // Redirect GC output to the file. -Xloggc:<filename>
2944 // ostream_init_log(), when called will use this filename
2945 // to initialize a fileStream.
2946 _gc_log_filename = strdup(tail);
2947 if (!is_filename_valid(_gc_log_filename)) {
2948 jio_fprintf(defaultStream::output_stream(),
2949 "Invalid file name for use with -Xloggc: Filename can only contain the "
2950 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2951 "Note %%p or %%t can only be used once\n", _gc_log_filename);
2952 return JNI_EINVAL;
2953 }
2954 FLAG_SET_CMDLINE(bool, PrintGC, true);
2955 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2957 // JNI hooks
2958 } else if (match_option(option, "-Xcheck", &tail)) {
2959 if (!strcmp(tail, ":jni")) {
2960 #if !INCLUDE_JNI_CHECK
2961 warning("JNI CHECKING is not supported in this VM");
2962 #else
2963 CheckJNICalls = true;
2964 #endif // INCLUDE_JNI_CHECK
2965 } else if (is_bad_option(option, args->ignoreUnrecognized,
2966 "check")) {
2967 return JNI_EINVAL;
2968 }
2969 } else if (match_option(option, "vfprintf", &tail)) {
2970 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2971 } else if (match_option(option, "exit", &tail)) {
2972 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2973 } else if (match_option(option, "abort", &tail)) {
2974 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2975 // -XX:+AggressiveHeap
2976 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2978 // This option inspects the machine and attempts to set various
2979 // parameters to be optimal for long-running, memory allocation
2980 // intensive jobs. It is intended for machines with large
2981 // amounts of cpu and memory.
2983 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2984 // VM, but we may not be able to represent the total physical memory
2985 // available (like having 8gb of memory on a box but using a 32bit VM).
2986 // Thus, we need to make sure we're using a julong for intermediate
2987 // calculations.
2988 julong initHeapSize;
2989 julong total_memory = os::physical_memory();
2991 if (total_memory < (julong)256*M) {
2992 jio_fprintf(defaultStream::error_stream(),
2993 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2994 vm_exit(1);
2995 }
2997 // The heap size is half of available memory, or (at most)
2998 // all of possible memory less 160mb (leaving room for the OS
2999 // when using ISM). This is the maximum; because adaptive sizing
3000 // is turned on below, the actual space used may be smaller.
3002 initHeapSize = MIN2(total_memory / (julong)2,
3003 total_memory - (julong)160*M);
3005 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3007 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3008 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3009 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3010 // Currently the minimum size and the initial heap sizes are the same.
3011 set_min_heap_size(initHeapSize);
3012 }
3013 if (FLAG_IS_DEFAULT(NewSize)) {
3014 // Make the young generation 3/8ths of the total heap.
3015 FLAG_SET_CMDLINE(uintx, NewSize,
3016 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3017 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3018 }
3020 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3021 FLAG_SET_DEFAULT(UseLargePages, true);
3022 #endif
3024 // Increase some data structure sizes for efficiency
3025 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3026 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3027 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3029 // See the OldPLABSize comment below, but replace 'after promotion'
3030 // with 'after copying'. YoungPLABSize is the size of the survivor
3031 // space per-gc-thread buffers. The default is 4kw.
3032 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3034 // OldPLABSize is the size of the buffers in the old gen that
3035 // UseParallelGC uses to promote live data that doesn't fit in the
3036 // survivor spaces. At any given time, there's one for each gc thread.
3037 // The default size is 1kw. These buffers are rarely used, since the
3038 // survivor spaces are usually big enough. For specjbb, however, there
3039 // are occasions when there's lots of live data in the young gen
3040 // and we end up promoting some of it. We don't have a definite
3041 // explanation for why bumping OldPLABSize helps, but the theory
3042 // is that a bigger PLAB results in retaining something like the
3043 // original allocation order after promotion, which improves mutator
3044 // locality. A minor effect may be that larger PLABs reduce the
3045 // number of PLAB allocation events during gc. The value of 8kw
3046 // was arrived at by experimenting with specjbb.
3047 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3049 // Enable parallel GC and adaptive generation sizing
3050 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3051 FLAG_SET_DEFAULT(ParallelGCThreads,
3052 Abstract_VM_Version::parallel_worker_threads());
3054 // Encourage steady state memory management
3055 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3057 // This appears to improve mutator locality
3058 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3060 // Get around early Solaris scheduling bug
3061 // (affinity vs other jobs on system)
3062 // but disallow DR and offlining (5008695).
3063 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3065 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3066 // The last option must always win.
3067 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3068 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3069 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3070 // The last option must always win.
3071 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3072 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3073 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3074 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3075 jio_fprintf(defaultStream::error_stream(),
3076 "Please use CMSClassUnloadingEnabled in place of "
3077 "CMSPermGenSweepingEnabled in the future\n");
3078 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3079 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3080 jio_fprintf(defaultStream::error_stream(),
3081 "Please use -XX:+UseGCOverheadLimit in place of "
3082 "-XX:+UseGCTimeLimit in the future\n");
3083 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3084 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3085 jio_fprintf(defaultStream::error_stream(),
3086 "Please use -XX:-UseGCOverheadLimit in place of "
3087 "-XX:-UseGCTimeLimit in the future\n");
3088 // The TLE options are for compatibility with 1.3 and will be
3089 // removed without notice in a future release. These options
3090 // are not to be documented.
3091 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3092 // No longer used.
3093 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3094 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3095 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3096 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3097 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3098 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3099 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3100 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3101 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3102 // No longer used.
3103 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3104 julong long_tlab_size = 0;
3105 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3106 if (errcode != arg_in_range) {
3107 jio_fprintf(defaultStream::error_stream(),
3108 "Invalid TLAB size: %s\n", option->optionString);
3109 describe_range_error(errcode);
3110 return JNI_EINVAL;
3111 }
3112 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3113 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3114 // No longer used.
3115 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3116 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3117 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3118 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3119 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3120 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3121 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3122 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3123 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3124 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3125 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3126 #if defined(DTRACE_ENABLED)
3127 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3128 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3129 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3130 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3131 #else // defined(DTRACE_ENABLED)
3132 jio_fprintf(defaultStream::error_stream(),
3133 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3134 return JNI_EINVAL;
3135 #endif // defined(DTRACE_ENABLED)
3136 #ifdef ASSERT
3137 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3138 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3139 // disable scavenge before parallel mark-compact
3140 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3141 #endif
3142 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3143 julong cms_blocks_to_claim = (julong)atol(tail);
3144 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3145 jio_fprintf(defaultStream::error_stream(),
3146 "Please use -XX:OldPLABSize in place of "
3147 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3148 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3149 julong cms_blocks_to_claim = (julong)atol(tail);
3150 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3151 jio_fprintf(defaultStream::error_stream(),
3152 "Please use -XX:OldPLABSize in place of "
3153 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3154 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3155 julong old_plab_size = 0;
3156 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3157 if (errcode != arg_in_range) {
3158 jio_fprintf(defaultStream::error_stream(),
3159 "Invalid old PLAB size: %s\n", option->optionString);
3160 describe_range_error(errcode);
3161 return JNI_EINVAL;
3162 }
3163 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3164 jio_fprintf(defaultStream::error_stream(),
3165 "Please use -XX:OldPLABSize in place of "
3166 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3167 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3168 julong young_plab_size = 0;
3169 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3170 if (errcode != arg_in_range) {
3171 jio_fprintf(defaultStream::error_stream(),
3172 "Invalid young PLAB size: %s\n", option->optionString);
3173 describe_range_error(errcode);
3174 return JNI_EINVAL;
3175 }
3176 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3177 jio_fprintf(defaultStream::error_stream(),
3178 "Please use -XX:YoungPLABSize in place of "
3179 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3180 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3181 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3182 julong stack_size = 0;
3183 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3184 if (errcode != arg_in_range) {
3185 jio_fprintf(defaultStream::error_stream(),
3186 "Invalid mark stack size: %s\n", option->optionString);
3187 describe_range_error(errcode);
3188 return JNI_EINVAL;
3189 }
3190 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3191 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3192 julong max_stack_size = 0;
3193 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3194 if (errcode != arg_in_range) {
3195 jio_fprintf(defaultStream::error_stream(),
3196 "Invalid maximum mark stack size: %s\n",
3197 option->optionString);
3198 describe_range_error(errcode);
3199 return JNI_EINVAL;
3200 }
3201 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3202 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3203 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3204 uintx conc_threads = 0;
3205 if (!parse_uintx(tail, &conc_threads, 1)) {
3206 jio_fprintf(defaultStream::error_stream(),
3207 "Invalid concurrent threads: %s\n", option->optionString);
3208 return JNI_EINVAL;
3209 }
3210 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3211 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3212 julong max_direct_memory_size = 0;
3213 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3214 if (errcode != arg_in_range) {
3215 jio_fprintf(defaultStream::error_stream(),
3216 "Invalid maximum direct memory size: %s\n",
3217 option->optionString);
3218 describe_range_error(errcode);
3219 return JNI_EINVAL;
3220 }
3221 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3222 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3223 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3224 // away and will cause VM initialization failures!
3225 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3226 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3227 #if !INCLUDE_MANAGEMENT
3228 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3229 jio_fprintf(defaultStream::error_stream(),
3230 "ManagementServer is not supported in this VM.\n");
3231 return JNI_ERR;
3232 #endif // INCLUDE_MANAGEMENT
3233 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3234 // Skip -XX:Flags= since that case has already been handled
3235 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3236 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3237 return JNI_EINVAL;
3238 }
3239 }
3240 // Unknown option
3241 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3242 return JNI_ERR;
3243 }
3244 }
3246 // Change the default value for flags which have different default values
3247 // when working with older JDKs.
3248 #ifdef LINUX
3249 if (JDK_Version::current().compare_major(6) <= 0 &&
3250 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3251 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3252 }
3253 #endif // LINUX
3254 return JNI_OK;
3255 }
3257 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3258 // This must be done after all -D arguments have been processed.
3259 scp_p->expand_endorsed();
3261 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3262 // Assemble the bootclasspath elements into the final path.
3263 Arguments::set_sysclasspath(scp_p->combined_path());
3264 }
3266 // This must be done after all arguments have been processed.
3267 // java_compiler() true means set to "NONE" or empty.
3268 if (java_compiler() && !xdebug_mode()) {
3269 // For backwards compatibility, we switch to interpreted mode if
3270 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3271 // not specified.
3272 set_mode_flags(_int);
3273 }
3274 if (CompileThreshold == 0) {
3275 set_mode_flags(_int);
3276 }
3278 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3279 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3280 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3281 }
3283 #ifndef COMPILER2
3284 // Don't degrade server performance for footprint
3285 if (FLAG_IS_DEFAULT(UseLargePages) &&
3286 MaxHeapSize < LargePageHeapSizeThreshold) {
3287 // No need for large granularity pages w/small heaps.
3288 // Note that large pages are enabled/disabled for both the
3289 // Java heap and the code cache.
3290 FLAG_SET_DEFAULT(UseLargePages, false);
3291 }
3293 #else
3294 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3295 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3296 }
3297 #endif
3299 #ifndef TIERED
3300 // Tiered compilation is undefined.
3301 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3302 #endif
3304 // If we are running in a headless jre, force java.awt.headless property
3305 // to be true unless the property has already been set.
3306 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3307 if (os::is_headless_jre()) {
3308 const char* headless = Arguments::get_property("java.awt.headless");
3309 if (headless == NULL) {
3310 char envbuffer[128];
3311 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3312 if (!add_property("java.awt.headless=true")) {
3313 return JNI_ENOMEM;
3314 }
3315 } else {
3316 char buffer[256];
3317 strcpy(buffer, "java.awt.headless=");
3318 strcat(buffer, envbuffer);
3319 if (!add_property(buffer)) {
3320 return JNI_ENOMEM;
3321 }
3322 }
3323 }
3324 }
3326 if (!check_vm_args_consistency()) {
3327 return JNI_ERR;
3328 }
3330 return JNI_OK;
3331 }
3333 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3334 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3335 scp_assembly_required_p);
3336 }
3338 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3339 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3340 scp_assembly_required_p);
3341 }
3343 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3344 const int N_MAX_OPTIONS = 64;
3345 const int OPTION_BUFFER_SIZE = 1024;
3346 char buffer[OPTION_BUFFER_SIZE];
3348 // The variable will be ignored if it exceeds the length of the buffer.
3349 // Don't check this variable if user has special privileges
3350 // (e.g. unix su command).
3351 if (os::getenv(name, buffer, sizeof(buffer)) &&
3352 !os::have_special_privileges()) {
3353 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3354 jio_fprintf(defaultStream::error_stream(),
3355 "Picked up %s: %s\n", name, buffer);
3356 char* rd = buffer; // pointer to the input string (rd)
3357 int i;
3358 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3359 while (isspace(*rd)) rd++; // skip whitespace
3360 if (*rd == 0) break; // we re done when the input string is read completely
3362 // The output, option string, overwrites the input string.
3363 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3364 // input string (rd).
3365 char* wrt = rd;
3367 options[i++].optionString = wrt; // Fill in option
3368 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3369 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3370 int quote = *rd; // matching quote to look for
3371 rd++; // don't copy open quote
3372 while (*rd != quote) { // include everything (even spaces) up until quote
3373 if (*rd == 0) { // string termination means unmatched string
3374 jio_fprintf(defaultStream::error_stream(),
3375 "Unmatched quote in %s\n", name);
3376 return JNI_ERR;
3377 }
3378 *wrt++ = *rd++; // copy to option string
3379 }
3380 rd++; // don't copy close quote
3381 } else {
3382 *wrt++ = *rd++; // copy to option string
3383 }
3384 }
3385 // Need to check if we're done before writing a NULL,
3386 // because the write could be to the byte that rd is pointing to.
3387 if (*rd++ == 0) {
3388 *wrt = 0;
3389 break;
3390 }
3391 *wrt = 0; // Zero terminate option
3392 }
3393 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3394 JavaVMInitArgs vm_args;
3395 vm_args.version = JNI_VERSION_1_2;
3396 vm_args.options = options;
3397 vm_args.nOptions = i;
3398 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3400 if (PrintVMOptions) {
3401 const char* tail;
3402 for (int i = 0; i < vm_args.nOptions; i++) {
3403 const JavaVMOption *option = vm_args.options + i;
3404 if (match_option(option, "-XX:", &tail)) {
3405 logOption(tail);
3406 }
3407 }
3408 }
3410 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3411 }
3412 return JNI_OK;
3413 }
3415 void Arguments::set_shared_spaces_flags() {
3416 if (DumpSharedSpaces) {
3417 if (RequireSharedSpaces) {
3418 warning("cannot dump shared archive while using shared archive");
3419 }
3420 UseSharedSpaces = false;
3421 #ifdef _LP64
3422 if (!UseCompressedOops || !UseCompressedClassPointers) {
3423 vm_exit_during_initialization(
3424 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3425 }
3426 } else {
3427 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.
3428 if (!UseCompressedOops || !UseCompressedClassPointers) {
3429 no_shared_spaces();
3430 }
3431 #endif
3432 }
3433 }
3435 #if !INCLUDE_ALL_GCS
3436 static void force_serial_gc() {
3437 FLAG_SET_DEFAULT(UseSerialGC, true);
3438 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3439 UNSUPPORTED_GC_OPTION(UseG1GC);
3440 UNSUPPORTED_GC_OPTION(UseParallelGC);
3441 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3442 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3443 UNSUPPORTED_GC_OPTION(UseParNewGC);
3444 }
3445 #endif // INCLUDE_ALL_GCS
3447 // Sharing support
3448 // Construct the path to the archive
3449 static char* get_shared_archive_path() {
3450 char *shared_archive_path;
3451 if (SharedArchiveFile == NULL) {
3452 char jvm_path[JVM_MAXPATHLEN];
3453 os::jvm_path(jvm_path, sizeof(jvm_path));
3454 char *end = strrchr(jvm_path, *os::file_separator());
3455 if (end != NULL) *end = '\0';
3456 size_t jvm_path_len = strlen(jvm_path);
3457 size_t file_sep_len = strlen(os::file_separator());
3458 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3459 file_sep_len + 20, mtInternal);
3460 if (shared_archive_path != NULL) {
3461 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3462 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3463 strncat(shared_archive_path, "classes.jsa", 11);
3464 }
3465 } else {
3466 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3467 if (shared_archive_path != NULL) {
3468 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3469 }
3470 }
3471 return shared_archive_path;
3472 }
3474 #ifndef PRODUCT
3475 // Determine whether LogVMOutput should be implicitly turned on.
3476 static bool use_vm_log() {
3477 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3478 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3479 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3480 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3481 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3482 return true;
3483 }
3485 #ifdef COMPILER1
3486 if (PrintC1Statistics) {
3487 return true;
3488 }
3489 #endif // COMPILER1
3491 #ifdef COMPILER2
3492 if (PrintOptoAssembly || PrintOptoStatistics) {
3493 return true;
3494 }
3495 #endif // COMPILER2
3497 return false;
3498 }
3499 #endif // PRODUCT
3501 // Parse entry point called from JNI_CreateJavaVM
3503 jint Arguments::parse(const JavaVMInitArgs* args) {
3505 // Remaining part of option string
3506 const char* tail;
3508 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3509 const char* hotspotrc = ".hotspotrc";
3510 bool settings_file_specified = false;
3511 bool needs_hotspotrc_warning = false;
3513 const char* flags_file;
3514 int index;
3515 for (index = 0; index < args->nOptions; index++) {
3516 const JavaVMOption *option = args->options + index;
3517 if (match_option(option, "-XX:Flags=", &tail)) {
3518 flags_file = tail;
3519 settings_file_specified = true;
3520 }
3521 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3522 PrintVMOptions = true;
3523 }
3524 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3525 PrintVMOptions = false;
3526 }
3527 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3528 IgnoreUnrecognizedVMOptions = true;
3529 }
3530 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3531 IgnoreUnrecognizedVMOptions = false;
3532 }
3533 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3534 CommandLineFlags::printFlags(tty, false);
3535 vm_exit(0);
3536 }
3537 #if INCLUDE_NMT
3538 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3539 // The launcher did not setup nmt environment variable properly.
3540 // if (!MemTracker::check_launcher_nmt_support(tail)) {
3541 // warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3542 // }
3544 // Verify if nmt option is valid.
3545 if (MemTracker::verify_nmt_option()) {
3546 // Late initialization, still in single-threaded mode.
3547 if (MemTracker::tracking_level() >= NMT_summary) {
3548 MemTracker::init();
3549 }
3550 } else {
3551 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3552 }
3553 }
3554 #endif
3557 #ifndef PRODUCT
3558 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3559 CommandLineFlags::printFlags(tty, true);
3560 vm_exit(0);
3561 }
3562 #endif
3563 }
3565 if (IgnoreUnrecognizedVMOptions) {
3566 // uncast const to modify the flag args->ignoreUnrecognized
3567 *(jboolean*)(&args->ignoreUnrecognized) = true;
3568 }
3570 // Parse specified settings file
3571 if (settings_file_specified) {
3572 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3573 return JNI_EINVAL;
3574 }
3575 } else {
3576 #ifdef ASSERT
3577 // Parse default .hotspotrc settings file
3578 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3579 return JNI_EINVAL;
3580 }
3581 #else
3582 struct stat buf;
3583 if (os::stat(hotspotrc, &buf) == 0) {
3584 needs_hotspotrc_warning = true;
3585 }
3586 #endif
3587 }
3589 if (PrintVMOptions) {
3590 for (index = 0; index < args->nOptions; index++) {
3591 const JavaVMOption *option = args->options + index;
3592 if (match_option(option, "-XX:", &tail)) {
3593 logOption(tail);
3594 }
3595 }
3596 }
3598 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3599 jint result = parse_vm_init_args(args);
3600 if (result != JNI_OK) {
3601 return result;
3602 }
3604 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3605 SharedArchivePath = get_shared_archive_path();
3606 if (SharedArchivePath == NULL) {
3607 return JNI_ENOMEM;
3608 }
3610 // Delay warning until here so that we've had a chance to process
3611 // the -XX:-PrintWarnings flag
3612 if (needs_hotspotrc_warning) {
3613 warning("%s file is present but has been ignored. "
3614 "Run with -XX:Flags=%s to load the file.",
3615 hotspotrc, hotspotrc);
3616 }
3618 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3619 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3620 #endif
3622 #if INCLUDE_ALL_GCS
3623 #if (defined JAVASE_EMBEDDED || defined ARM)
3624 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3625 #endif
3626 #endif
3628 #ifndef PRODUCT
3629 if (TraceBytecodesAt != 0) {
3630 TraceBytecodes = true;
3631 }
3632 if (CountCompiledCalls) {
3633 if (UseCounterDecay) {
3634 warning("UseCounterDecay disabled because CountCalls is set");
3635 UseCounterDecay = false;
3636 }
3637 }
3638 #endif // PRODUCT
3640 // JSR 292 is not supported before 1.7
3641 if (!JDK_Version::is_gte_jdk17x_version()) {
3642 if (EnableInvokeDynamic) {
3643 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3644 warning("JSR 292 is not supported before 1.7. Disabling support.");
3645 }
3646 EnableInvokeDynamic = false;
3647 }
3648 }
3650 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3651 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3652 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3653 }
3654 ScavengeRootsInCode = 1;
3655 }
3657 if (PrintGCDetails) {
3658 // Turn on -verbose:gc options as well
3659 PrintGC = true;
3660 }
3662 if (!JDK_Version::is_gte_jdk18x_version()) {
3663 // To avoid changing the log format for 7 updates this flag is only
3664 // true by default in JDK8 and above.
3665 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3666 FLAG_SET_DEFAULT(PrintGCCause, false);
3667 }
3668 }
3670 // Set object alignment values.
3671 set_object_alignment();
3673 #if !INCLUDE_ALL_GCS
3674 force_serial_gc();
3675 #endif // INCLUDE_ALL_GCS
3676 #if !INCLUDE_CDS
3677 if (DumpSharedSpaces || RequireSharedSpaces) {
3678 jio_fprintf(defaultStream::error_stream(),
3679 "Shared spaces are not supported in this VM\n");
3680 return JNI_ERR;
3681 }
3682 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3683 warning("Shared spaces are not supported in this VM");
3684 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3685 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3686 }
3687 no_shared_spaces();
3688 #endif // INCLUDE_CDS
3690 return JNI_OK;
3691 }
3693 jint Arguments::apply_ergo() {
3695 // Set flags based on ergonomics.
3696 set_ergonomics_flags();
3698 set_shared_spaces_flags();
3700 // Check the GC selections again.
3701 if (!check_gc_consistency()) {
3702 return JNI_EINVAL;
3703 }
3705 if (TieredCompilation) {
3706 set_tiered_flags();
3707 } else {
3708 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3709 if (CompilationPolicyChoice >= 2) {
3710 vm_exit_during_initialization(
3711 "Incompatible compilation policy selected", NULL);
3712 }
3713 }
3714 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
3715 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3716 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
3717 }
3720 // Set heap size based on available physical memory
3721 set_heap_size();
3723 #if INCLUDE_ALL_GCS
3724 // Set per-collector flags
3725 if (UseParallelGC || UseParallelOldGC) {
3726 set_parallel_gc_flags();
3727 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
3728 set_cms_and_parnew_gc_flags();
3729 } else if (UseParNewGC) { // Skipped if CMS is set above
3730 set_parnew_gc_flags();
3731 } else if (UseG1GC) {
3732 set_g1_gc_flags();
3733 }
3734 check_deprecated_gcs();
3735 check_deprecated_gc_flags();
3736 if (AssumeMP && !UseSerialGC) {
3737 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3738 warning("If the number of processors is expected to increase from one, then"
3739 " you should configure the number of parallel GC threads appropriately"
3740 " using -XX:ParallelGCThreads=N");
3741 }
3742 }
3743 if (MinHeapFreeRatio == 100) {
3744 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
3745 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
3746 }
3747 #else // INCLUDE_ALL_GCS
3748 assert(verify_serial_gc_flags(), "SerialGC unset");
3749 #endif // INCLUDE_ALL_GCS
3751 // Initialize Metaspace flags and alignments.
3752 Metaspace::ergo_initialize();
3754 // Set bytecode rewriting flags
3755 set_bytecode_flags();
3757 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3758 set_aggressive_opts_flags();
3760 // Turn off biased locking for locking debug mode flags,
3761 // which are subtlely different from each other but neither works with
3762 // biased locking.
3763 if (UseHeavyMonitors
3764 #ifdef COMPILER1
3765 || !UseFastLocking
3766 #endif // COMPILER1
3767 ) {
3768 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3769 // flag set to true on command line; warn the user that they
3770 // can't enable biased locking here
3771 warning("Biased Locking is not supported with locking debug flags"
3772 "; ignoring UseBiasedLocking flag." );
3773 }
3774 UseBiasedLocking = false;
3775 }
3777 #ifdef ZERO
3778 // Clear flags not supported on zero.
3779 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3780 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3781 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3782 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3783 #endif // CC_INTERP
3785 #ifdef COMPILER2
3786 if (!EliminateLocks) {
3787 EliminateNestedLocks = false;
3788 }
3789 if (!Inline) {
3790 IncrementalInline = false;
3791 }
3792 #ifndef PRODUCT
3793 if (!IncrementalInline) {
3794 AlwaysIncrementalInline = false;
3795 }
3796 #endif
3797 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3798 // incremental inlining: bump MaxNodeLimit
3799 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3800 }
3801 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3802 // nothing to use the profiling, turn if off
3803 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3804 }
3805 #endif
3807 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3808 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3809 DebugNonSafepoints = true;
3810 }
3812 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3813 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3814 }
3816 #ifndef PRODUCT
3817 if (CompileTheWorld) {
3818 // Force NmethodSweeper to sweep whole CodeCache each time.
3819 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3820 NmethodSweepFraction = 1;
3821 }
3822 }
3824 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3825 if (use_vm_log()) {
3826 LogVMOutput = true;
3827 }
3828 }
3829 #endif // PRODUCT
3831 if (PrintCommandLineFlags) {
3832 CommandLineFlags::printSetFlags(tty);
3833 }
3835 // Apply CPU specific policy for the BiasedLocking
3836 if (UseBiasedLocking) {
3837 if (!VM_Version::use_biased_locking() &&
3838 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3839 UseBiasedLocking = false;
3840 }
3841 }
3842 #ifdef COMPILER2
3843 if (!UseBiasedLocking || EmitSync != 0) {
3844 UseOptoBiasInlining = false;
3845 }
3846 #endif
3848 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3849 // but only if not already set on the commandline
3850 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3851 bool set = false;
3852 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3853 if (!set) {
3854 FLAG_SET_DEFAULT(PauseAtExit, true);
3855 }
3856 }
3858 return JNI_OK;
3859 }
3861 jint Arguments::adjust_after_os() {
3862 if (UseNUMA) {
3863 if (UseParallelGC || UseParallelOldGC) {
3864 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3865 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3866 }
3867 }
3868 // UseNUMAInterleaving is set to ON for all collectors and
3869 // platforms when UseNUMA is set to ON. NUMA-aware collectors
3870 // such as the parallel collector for Linux and Solaris will
3871 // interleave old gen and survivor spaces on top of NUMA
3872 // allocation policy for the eden space.
3873 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
3874 // all platforms and ParallelGC on Windows will interleave all
3875 // of the heap spaces across NUMA nodes.
3876 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
3877 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
3878 }
3879 }
3880 return JNI_OK;
3881 }
3883 int Arguments::PropertyList_count(SystemProperty* pl) {
3884 int count = 0;
3885 while(pl != NULL) {
3886 count++;
3887 pl = pl->next();
3888 }
3889 return count;
3890 }
3892 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3893 assert(key != NULL, "just checking");
3894 SystemProperty* prop;
3895 for (prop = pl; prop != NULL; prop = prop->next()) {
3896 if (strcmp(key, prop->key()) == 0) return prop->value();
3897 }
3898 return NULL;
3899 }
3901 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3902 int count = 0;
3903 const char* ret_val = NULL;
3905 while(pl != NULL) {
3906 if(count >= index) {
3907 ret_val = pl->key();
3908 break;
3909 }
3910 count++;
3911 pl = pl->next();
3912 }
3914 return ret_val;
3915 }
3917 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3918 int count = 0;
3919 char* ret_val = NULL;
3921 while(pl != NULL) {
3922 if(count >= index) {
3923 ret_val = pl->value();
3924 break;
3925 }
3926 count++;
3927 pl = pl->next();
3928 }
3930 return ret_val;
3931 }
3933 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3934 SystemProperty* p = *plist;
3935 if (p == NULL) {
3936 *plist = new_p;
3937 } else {
3938 while (p->next() != NULL) {
3939 p = p->next();
3940 }
3941 p->set_next(new_p);
3942 }
3943 }
3945 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3946 if (plist == NULL)
3947 return;
3949 SystemProperty* new_p = new SystemProperty(k, v, true);
3950 PropertyList_add(plist, new_p);
3951 }
3953 // This add maintains unique property key in the list.
3954 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3955 if (plist == NULL)
3956 return;
3958 // If property key exist then update with new value.
3959 SystemProperty* prop;
3960 for (prop = *plist; prop != NULL; prop = prop->next()) {
3961 if (strcmp(k, prop->key()) == 0) {
3962 if (append) {
3963 prop->append_value(v);
3964 } else {
3965 prop->set_value(v);
3966 }
3967 return;
3968 }
3969 }
3971 PropertyList_add(plist, k, v);
3972 }
3974 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3975 // Returns true if all of the source pointed by src has been copied over to
3976 // the destination buffer pointed by buf. Otherwise, returns false.
3977 // Notes:
3978 // 1. If the length (buflen) of the destination buffer excluding the
3979 // NULL terminator character is not long enough for holding the expanded
3980 // pid characters, it also returns false instead of returning the partially
3981 // expanded one.
3982 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3983 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3984 char* buf, size_t buflen) {
3985 const char* p = src;
3986 char* b = buf;
3987 const char* src_end = &src[srclen];
3988 char* buf_end = &buf[buflen - 1];
3990 while (p < src_end && b < buf_end) {
3991 if (*p == '%') {
3992 switch (*(++p)) {
3993 case '%': // "%%" ==> "%"
3994 *b++ = *p++;
3995 break;
3996 case 'p': { // "%p" ==> current process id
3997 // buf_end points to the character before the last character so
3998 // that we could write '\0' to the end of the buffer.
3999 size_t buf_sz = buf_end - b + 1;
4000 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4002 // if jio_snprintf fails or the buffer is not long enough to hold
4003 // the expanded pid, returns false.
4004 if (ret < 0 || ret >= (int)buf_sz) {
4005 return false;
4006 } else {
4007 b += ret;
4008 assert(*b == '\0', "fail in copy_expand_pid");
4009 if (p == src_end && b == buf_end + 1) {
4010 // reach the end of the buffer.
4011 return true;
4012 }
4013 }
4014 p++;
4015 break;
4016 }
4017 default :
4018 *b++ = '%';
4019 }
4020 } else {
4021 *b++ = *p++;
4022 }
4023 }
4024 *b = '\0';
4025 return (p == src_end); // return false if not all of the source was copied
4026 }