Mon, 21 Apr 2014 10:36:31 -1000
8038898: Safer safepoints
Reviewed-by: kvn, ahgross
1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "classfile/javaAssertions.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "compiler/compilerOracle.hpp"
29 #include "memory/allocation.inline.hpp"
30 #include "memory/cardTableRS.hpp"
31 #include "memory/genCollectedHeap.hpp"
32 #include "memory/referenceProcessor.hpp"
33 #include "memory/universe.inline.hpp"
34 #include "oops/oop.inline.hpp"
35 #include "prims/jvmtiExport.hpp"
36 #include "runtime/arguments.hpp"
37 #include "runtime/globals_extension.hpp"
38 #include "runtime/java.hpp"
39 #include "services/management.hpp"
40 #include "services/memTracker.hpp"
41 #include "utilities/defaultStream.hpp"
42 #include "utilities/macros.hpp"
43 #include "utilities/taskqueue.hpp"
44 #ifdef TARGET_OS_FAMILY_linux
45 # include "os_linux.inline.hpp"
46 #endif
47 #ifdef TARGET_OS_FAMILY_solaris
48 # include "os_solaris.inline.hpp"
49 #endif
50 #ifdef TARGET_OS_FAMILY_windows
51 # include "os_windows.inline.hpp"
52 #endif
53 #ifdef TARGET_OS_FAMILY_bsd
54 # include "os_bsd.inline.hpp"
55 #endif
56 #if INCLUDE_ALL_GCS
57 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
58 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
59 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
60 #endif // INCLUDE_ALL_GCS
62 // Note: This is a special bug reporting site for the JVM
63 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
64 #define DEFAULT_JAVA_LAUNCHER "generic"
66 // Disable options not supported in this release, with a warning if they
67 // were explicitly requested on the command-line
68 #define UNSUPPORTED_OPTION(opt, description) \
69 do { \
70 if (opt) { \
71 if (FLAG_IS_CMDLINE(opt)) { \
72 warning(description " is disabled in this release."); \
73 } \
74 FLAG_SET_DEFAULT(opt, false); \
75 } \
76 } while(0)
78 #define UNSUPPORTED_GC_OPTION(gc) \
79 do { \
80 if (gc) { \
81 if (FLAG_IS_CMDLINE(gc)) { \
82 warning(#gc " is not supported in this VM. Using Serial GC."); \
83 } \
84 FLAG_SET_DEFAULT(gc, false); \
85 } \
86 } while(0)
88 char** Arguments::_jvm_flags_array = NULL;
89 int Arguments::_num_jvm_flags = 0;
90 char** Arguments::_jvm_args_array = NULL;
91 int Arguments::_num_jvm_args = 0;
92 char* Arguments::_java_command = NULL;
93 SystemProperty* Arguments::_system_properties = NULL;
94 const char* Arguments::_gc_log_filename = NULL;
95 bool Arguments::_has_profile = false;
96 size_t Arguments::_conservative_max_heap_alignment = 0;
97 uintx Arguments::_min_heap_size = 0;
98 Arguments::Mode Arguments::_mode = _mixed;
99 bool Arguments::_java_compiler = false;
100 bool Arguments::_xdebug_mode = false;
101 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
102 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
103 int Arguments::_sun_java_launcher_pid = -1;
104 bool Arguments::_created_by_gamma_launcher = false;
106 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
107 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
108 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
109 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
110 bool Arguments::_ClipInlining = ClipInlining;
112 char* Arguments::SharedArchivePath = NULL;
114 AgentLibraryList Arguments::_libraryList;
115 AgentLibraryList Arguments::_agentList;
117 abort_hook_t Arguments::_abort_hook = NULL;
118 exit_hook_t Arguments::_exit_hook = NULL;
119 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
122 SystemProperty *Arguments::_java_ext_dirs = NULL;
123 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
124 SystemProperty *Arguments::_sun_boot_library_path = NULL;
125 SystemProperty *Arguments::_java_library_path = NULL;
126 SystemProperty *Arguments::_java_home = NULL;
127 SystemProperty *Arguments::_java_class_path = NULL;
128 SystemProperty *Arguments::_sun_boot_class_path = NULL;
130 char* Arguments::_meta_index_path = NULL;
131 char* Arguments::_meta_index_dir = NULL;
133 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
135 static bool match_option(const JavaVMOption *option, const char* name,
136 const char** tail) {
137 int len = (int)strlen(name);
138 if (strncmp(option->optionString, name, len) == 0) {
139 *tail = option->optionString + len;
140 return true;
141 } else {
142 return false;
143 }
144 }
146 static void logOption(const char* opt) {
147 if (PrintVMOptions) {
148 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
149 }
150 }
152 // Process java launcher properties.
153 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
154 // See if sun.java.launcher or sun.java.launcher.pid is defined.
155 // Must do this before setting up other system properties,
156 // as some of them may depend on launcher type.
157 for (int index = 0; index < args->nOptions; index++) {
158 const JavaVMOption* option = args->options + index;
159 const char* tail;
161 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
162 process_java_launcher_argument(tail, option->extraInfo);
163 continue;
164 }
165 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
166 _sun_java_launcher_pid = atoi(tail);
167 continue;
168 }
169 }
170 }
172 // Initialize system properties key and value.
173 void Arguments::init_system_properties() {
175 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
176 "Java Virtual Machine Specification", false));
177 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
178 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
179 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
181 // following are JVMTI agent writeable properties.
182 // Properties values are set to NULL and they are
183 // os specific they are initialized in os::init_system_properties_values().
184 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
185 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
186 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
187 _java_library_path = new SystemProperty("java.library.path", NULL, true);
188 _java_home = new SystemProperty("java.home", NULL, true);
189 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
191 _java_class_path = new SystemProperty("java.class.path", "", true);
193 // Add to System Property list.
194 PropertyList_add(&_system_properties, _java_ext_dirs);
195 PropertyList_add(&_system_properties, _java_endorsed_dirs);
196 PropertyList_add(&_system_properties, _sun_boot_library_path);
197 PropertyList_add(&_system_properties, _java_library_path);
198 PropertyList_add(&_system_properties, _java_home);
199 PropertyList_add(&_system_properties, _java_class_path);
200 PropertyList_add(&_system_properties, _sun_boot_class_path);
202 // Set OS specific system properties values
203 os::init_system_properties_values();
204 }
207 // Update/Initialize System properties after JDK version number is known
208 void Arguments::init_version_specific_system_properties() {
209 enum { bufsz = 16 };
210 char buffer[bufsz];
211 const char* spec_vendor = "Sun Microsystems Inc.";
212 uint32_t spec_version = 0;
214 if (JDK_Version::is_gte_jdk17x_version()) {
215 spec_vendor = "Oracle Corporation";
216 spec_version = JDK_Version::current().major_version();
217 }
218 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
220 PropertyList_add(&_system_properties,
221 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
222 PropertyList_add(&_system_properties,
223 new SystemProperty("java.vm.specification.version", buffer, false));
224 PropertyList_add(&_system_properties,
225 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
226 }
228 /**
229 * Provide a slightly more user-friendly way of eliminating -XX flags.
230 * When a flag is eliminated, it can be added to this list in order to
231 * continue accepting this flag on the command-line, while issuing a warning
232 * and ignoring the value. Once the JDK version reaches the 'accept_until'
233 * limit, we flatly refuse to admit the existence of the flag. This allows
234 * a flag to die correctly over JDK releases using HSX.
235 */
236 typedef struct {
237 const char* name;
238 JDK_Version obsoleted_in; // when the flag went away
239 JDK_Version accept_until; // which version to start denying the existence
240 } ObsoleteFlag;
242 static ObsoleteFlag obsolete_jvm_flags[] = {
243 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
244 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
245 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
246 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
247 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
248 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
249 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
250 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
251 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
252 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
253 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
254 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
255 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
256 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
257 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
258 { "DefaultInitialRAMFraction",
259 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
260 { "UseDepthFirstScavengeOrder",
261 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
262 { "HandlePromotionFailure",
263 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
264 { "MaxLiveObjectEvacuationRatio",
265 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
266 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
267 { "UseParallelOldGCCompacting",
268 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
269 { "UseParallelDensePrefixUpdate",
270 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
271 { "UseParallelOldGCDensePrefix",
272 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
273 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
274 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
275 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
276 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
277 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
278 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
279 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
280 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
281 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
282 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
283 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
284 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
285 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
286 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
293 #ifdef PRODUCT
294 { "DesiredMethodLimit",
295 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
296 #endif // PRODUCT
297 { NULL, JDK_Version(0), JDK_Version(0) }
298 };
300 // Returns true if the flag is obsolete and fits into the range specified
301 // for being ignored. In the case that the flag is ignored, the 'version'
302 // value is filled in with the version number when the flag became
303 // obsolete so that that value can be displayed to the user.
304 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
305 int i = 0;
306 assert(version != NULL, "Must provide a version buffer");
307 while (obsolete_jvm_flags[i].name != NULL) {
308 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
309 // <flag>=xxx form
310 // [-|+]<flag> form
311 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
312 ((s[0] == '+' || s[0] == '-') &&
313 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
314 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
315 *version = flag_status.obsoleted_in;
316 return true;
317 }
318 }
319 i++;
320 }
321 return false;
322 }
324 // Constructs the system class path (aka boot class path) from the following
325 // components, in order:
326 //
327 // prefix // from -Xbootclasspath/p:...
328 // endorsed // the expansion of -Djava.endorsed.dirs=...
329 // base // from os::get_system_properties() or -Xbootclasspath=
330 // suffix // from -Xbootclasspath/a:...
331 //
332 // java.endorsed.dirs is a list of directories; any jar or zip files in the
333 // directories are added to the sysclasspath just before the base.
334 //
335 // This could be AllStatic, but it isn't needed after argument processing is
336 // complete.
337 class SysClassPath: public StackObj {
338 public:
339 SysClassPath(const char* base);
340 ~SysClassPath();
342 inline void set_base(const char* base);
343 inline void add_prefix(const char* prefix);
344 inline void add_suffix_to_prefix(const char* suffix);
345 inline void add_suffix(const char* suffix);
346 inline void reset_path(const char* base);
348 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
349 // property. Must be called after all command-line arguments have been
350 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
351 // combined_path().
352 void expand_endorsed();
354 inline const char* get_base() const { return _items[_scp_base]; }
355 inline const char* get_prefix() const { return _items[_scp_prefix]; }
356 inline const char* get_suffix() const { return _items[_scp_suffix]; }
357 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
359 // Combine all the components into a single c-heap-allocated string; caller
360 // must free the string if/when no longer needed.
361 char* combined_path();
363 private:
364 // Utility routines.
365 static char* add_to_path(const char* path, const char* str, bool prepend);
366 static char* add_jars_to_path(char* path, const char* directory);
368 inline void reset_item_at(int index);
370 // Array indices for the items that make up the sysclasspath. All except the
371 // base are allocated in the C heap and freed by this class.
372 enum {
373 _scp_prefix, // from -Xbootclasspath/p:...
374 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
375 _scp_base, // the default sysclasspath
376 _scp_suffix, // from -Xbootclasspath/a:...
377 _scp_nitems // the number of items, must be last.
378 };
380 const char* _items[_scp_nitems];
381 DEBUG_ONLY(bool _expansion_done;)
382 };
384 SysClassPath::SysClassPath(const char* base) {
385 memset(_items, 0, sizeof(_items));
386 _items[_scp_base] = base;
387 DEBUG_ONLY(_expansion_done = false;)
388 }
390 SysClassPath::~SysClassPath() {
391 // Free everything except the base.
392 for (int i = 0; i < _scp_nitems; ++i) {
393 if (i != _scp_base) reset_item_at(i);
394 }
395 DEBUG_ONLY(_expansion_done = false;)
396 }
398 inline void SysClassPath::set_base(const char* base) {
399 _items[_scp_base] = base;
400 }
402 inline void SysClassPath::add_prefix(const char* prefix) {
403 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
404 }
406 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
407 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
408 }
410 inline void SysClassPath::add_suffix(const char* suffix) {
411 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
412 }
414 inline void SysClassPath::reset_item_at(int index) {
415 assert(index < _scp_nitems && index != _scp_base, "just checking");
416 if (_items[index] != NULL) {
417 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
418 _items[index] = NULL;
419 }
420 }
422 inline void SysClassPath::reset_path(const char* base) {
423 // Clear the prefix and suffix.
424 reset_item_at(_scp_prefix);
425 reset_item_at(_scp_suffix);
426 set_base(base);
427 }
429 //------------------------------------------------------------------------------
431 void SysClassPath::expand_endorsed() {
432 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
434 const char* path = Arguments::get_property("java.endorsed.dirs");
435 if (path == NULL) {
436 path = Arguments::get_endorsed_dir();
437 assert(path != NULL, "no default for java.endorsed.dirs");
438 }
440 char* expanded_path = NULL;
441 const char separator = *os::path_separator();
442 const char* const end = path + strlen(path);
443 while (path < end) {
444 const char* tmp_end = strchr(path, separator);
445 if (tmp_end == NULL) {
446 expanded_path = add_jars_to_path(expanded_path, path);
447 path = end;
448 } else {
449 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
450 memcpy(dirpath, path, tmp_end - path);
451 dirpath[tmp_end - path] = '\0';
452 expanded_path = add_jars_to_path(expanded_path, dirpath);
453 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
454 path = tmp_end + 1;
455 }
456 }
457 _items[_scp_endorsed] = expanded_path;
458 DEBUG_ONLY(_expansion_done = true;)
459 }
461 // Combine the bootclasspath elements, some of which may be null, into a single
462 // c-heap-allocated string.
463 char* SysClassPath::combined_path() {
464 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
465 assert(_expansion_done, "must call expand_endorsed() first.");
467 size_t lengths[_scp_nitems];
468 size_t total_len = 0;
470 const char separator = *os::path_separator();
472 // Get the lengths.
473 int i;
474 for (i = 0; i < _scp_nitems; ++i) {
475 if (_items[i] != NULL) {
476 lengths[i] = strlen(_items[i]);
477 // Include space for the separator char (or a NULL for the last item).
478 total_len += lengths[i] + 1;
479 }
480 }
481 assert(total_len > 0, "empty sysclasspath not allowed");
483 // Copy the _items to a single string.
484 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
485 char* cp_tmp = cp;
486 for (i = 0; i < _scp_nitems; ++i) {
487 if (_items[i] != NULL) {
488 memcpy(cp_tmp, _items[i], lengths[i]);
489 cp_tmp += lengths[i];
490 *cp_tmp++ = separator;
491 }
492 }
493 *--cp_tmp = '\0'; // Replace the extra separator.
494 return cp;
495 }
497 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
498 char*
499 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
500 char *cp;
502 assert(str != NULL, "just checking");
503 if (path == NULL) {
504 size_t len = strlen(str) + 1;
505 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
506 memcpy(cp, str, len); // copy the trailing null
507 } else {
508 const char separator = *os::path_separator();
509 size_t old_len = strlen(path);
510 size_t str_len = strlen(str);
511 size_t len = old_len + str_len + 2;
513 if (prepend) {
514 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
515 char* cp_tmp = cp;
516 memcpy(cp_tmp, str, str_len);
517 cp_tmp += str_len;
518 *cp_tmp = separator;
519 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
520 FREE_C_HEAP_ARRAY(char, path, mtInternal);
521 } else {
522 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
523 char* cp_tmp = cp + old_len;
524 *cp_tmp = separator;
525 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
526 }
527 }
528 return cp;
529 }
531 // Scan the directory and append any jar or zip files found to path.
532 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
533 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
534 DIR* dir = os::opendir(directory);
535 if (dir == NULL) return path;
537 char dir_sep[2] = { '\0', '\0' };
538 size_t directory_len = strlen(directory);
539 const char fileSep = *os::file_separator();
540 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
542 /* Scan the directory for jars/zips, appending them to path. */
543 struct dirent *entry;
544 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
545 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
546 const char* name = entry->d_name;
547 const char* ext = name + strlen(name) - 4;
548 bool isJarOrZip = ext > name &&
549 (os::file_name_strcmp(ext, ".jar") == 0 ||
550 os::file_name_strcmp(ext, ".zip") == 0);
551 if (isJarOrZip) {
552 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
553 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
554 path = add_to_path(path, jarpath, false);
555 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
556 }
557 }
558 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
559 os::closedir(dir);
560 return path;
561 }
563 // Parses a memory size specification string.
564 static bool atomull(const char *s, julong* result) {
565 julong n = 0;
566 int args_read = sscanf(s, JULONG_FORMAT, &n);
567 if (args_read != 1) {
568 return false;
569 }
570 while (*s != '\0' && isdigit(*s)) {
571 s++;
572 }
573 // 4705540: illegal if more characters are found after the first non-digit
574 if (strlen(s) > 1) {
575 return false;
576 }
577 switch (*s) {
578 case 'T': case 't':
579 *result = n * G * K;
580 // Check for overflow.
581 if (*result/((julong)G * K) != n) return false;
582 return true;
583 case 'G': case 'g':
584 *result = n * G;
585 if (*result/G != n) return false;
586 return true;
587 case 'M': case 'm':
588 *result = n * M;
589 if (*result/M != n) return false;
590 return true;
591 case 'K': case 'k':
592 *result = n * K;
593 if (*result/K != n) return false;
594 return true;
595 case '\0':
596 *result = n;
597 return true;
598 default:
599 return false;
600 }
601 }
603 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
604 if (size < min_size) return arg_too_small;
605 // Check that size will fit in a size_t (only relevant on 32-bit)
606 if (size > max_uintx) return arg_too_big;
607 return arg_in_range;
608 }
610 // Describe an argument out of range error
611 void Arguments::describe_range_error(ArgsRange errcode) {
612 switch(errcode) {
613 case arg_too_big:
614 jio_fprintf(defaultStream::error_stream(),
615 "The specified size exceeds the maximum "
616 "representable size.\n");
617 break;
618 case arg_too_small:
619 case arg_unreadable:
620 case arg_in_range:
621 // do nothing for now
622 break;
623 default:
624 ShouldNotReachHere();
625 }
626 }
628 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
629 return CommandLineFlags::boolAtPut(name, &value, origin);
630 }
632 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
633 double v;
634 if (sscanf(value, "%lf", &v) != 1) {
635 return false;
636 }
638 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
639 return true;
640 }
641 return false;
642 }
644 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
645 julong v;
646 intx intx_v;
647 bool is_neg = false;
648 // Check the sign first since atomull() parses only unsigned values.
649 if (*value == '-') {
650 if (!CommandLineFlags::intxAt(name, &intx_v)) {
651 return false;
652 }
653 value++;
654 is_neg = true;
655 }
656 if (!atomull(value, &v)) {
657 return false;
658 }
659 intx_v = (intx) v;
660 if (is_neg) {
661 intx_v = -intx_v;
662 }
663 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
664 return true;
665 }
666 uintx uintx_v = (uintx) v;
667 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
668 return true;
669 }
670 uint64_t uint64_t_v = (uint64_t) v;
671 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
672 return true;
673 }
674 return false;
675 }
677 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
678 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
679 // Contract: CommandLineFlags always returns a pointer that needs freeing.
680 FREE_C_HEAP_ARRAY(char, value, mtInternal);
681 return true;
682 }
684 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
685 const char* old_value = "";
686 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
687 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
688 size_t new_len = strlen(new_value);
689 const char* value;
690 char* free_this_too = NULL;
691 if (old_len == 0) {
692 value = new_value;
693 } else if (new_len == 0) {
694 value = old_value;
695 } else {
696 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
697 // each new setting adds another LINE to the switch:
698 sprintf(buf, "%s\n%s", old_value, new_value);
699 value = buf;
700 free_this_too = buf;
701 }
702 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
703 // CommandLineFlags always returns a pointer that needs freeing.
704 FREE_C_HEAP_ARRAY(char, value, mtInternal);
705 if (free_this_too != NULL) {
706 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
707 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
708 }
709 return true;
710 }
712 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
714 // range of acceptable characters spelled out for portability reasons
715 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
716 #define BUFLEN 255
717 char name[BUFLEN+1];
718 char dummy;
720 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
721 return set_bool_flag(name, false, origin);
722 }
723 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
724 return set_bool_flag(name, true, origin);
725 }
727 char punct;
728 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
729 const char* value = strchr(arg, '=') + 1;
730 Flag* flag = Flag::find_flag(name, strlen(name));
731 if (flag != NULL && flag->is_ccstr()) {
732 if (flag->ccstr_accumulates()) {
733 return append_to_string_flag(name, value, origin);
734 } else {
735 if (value[0] == '\0') {
736 value = NULL;
737 }
738 return set_string_flag(name, value, origin);
739 }
740 }
741 }
743 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
744 const char* value = strchr(arg, '=') + 1;
745 // -XX:Foo:=xxx will reset the string flag to the given value.
746 if (value[0] == '\0') {
747 value = NULL;
748 }
749 return set_string_flag(name, value, origin);
750 }
752 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
753 #define SIGNED_NUMBER_RANGE "[-0123456789]"
754 #define NUMBER_RANGE "[0123456789]"
755 char value[BUFLEN + 1];
756 char value2[BUFLEN + 1];
757 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
758 // Looks like a floating-point number -- try again with more lenient format string
759 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
760 return set_fp_numeric_flag(name, value, origin);
761 }
762 }
764 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
765 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
766 return set_numeric_flag(name, value, origin);
767 }
769 return false;
770 }
772 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
773 assert(bldarray != NULL, "illegal argument");
775 if (arg == NULL) {
776 return;
777 }
779 int new_count = *count + 1;
781 // expand the array and add arg to the last element
782 if (*bldarray == NULL) {
783 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
784 } else {
785 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
786 }
787 (*bldarray)[*count] = strdup(arg);
788 *count = new_count;
789 }
791 void Arguments::build_jvm_args(const char* arg) {
792 add_string(&_jvm_args_array, &_num_jvm_args, arg);
793 }
795 void Arguments::build_jvm_flags(const char* arg) {
796 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
797 }
799 // utility function to return a string that concatenates all
800 // strings in a given char** array
801 const char* Arguments::build_resource_string(char** args, int count) {
802 if (args == NULL || count == 0) {
803 return NULL;
804 }
805 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
806 for (int i = 1; i < count; i++) {
807 length += strlen(args[i]) + 1; // add 1 for a space
808 }
809 char* s = NEW_RESOURCE_ARRAY(char, length);
810 strcpy(s, args[0]);
811 for (int j = 1; j < count; j++) {
812 strcat(s, " ");
813 strcat(s, args[j]);
814 }
815 return (const char*) s;
816 }
818 void Arguments::print_on(outputStream* st) {
819 st->print_cr("VM Arguments:");
820 if (num_jvm_flags() > 0) {
821 st->print("jvm_flags: "); print_jvm_flags_on(st);
822 }
823 if (num_jvm_args() > 0) {
824 st->print("jvm_args: "); print_jvm_args_on(st);
825 }
826 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
827 if (_java_class_path != NULL) {
828 char* path = _java_class_path->value();
829 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
830 }
831 st->print_cr("Launcher Type: %s", _sun_java_launcher);
832 }
834 void Arguments::print_jvm_flags_on(outputStream* st) {
835 if (_num_jvm_flags > 0) {
836 for (int i=0; i < _num_jvm_flags; i++) {
837 st->print("%s ", _jvm_flags_array[i]);
838 }
839 st->print_cr("");
840 }
841 }
843 void Arguments::print_jvm_args_on(outputStream* st) {
844 if (_num_jvm_args > 0) {
845 for (int i=0; i < _num_jvm_args; i++) {
846 st->print("%s ", _jvm_args_array[i]);
847 }
848 st->print_cr("");
849 }
850 }
852 bool Arguments::process_argument(const char* arg,
853 jboolean ignore_unrecognized, Flag::Flags origin) {
855 JDK_Version since = JDK_Version();
857 if (parse_argument(arg, origin) || ignore_unrecognized) {
858 return true;
859 }
861 bool has_plus_minus = (*arg == '+' || *arg == '-');
862 const char* const argname = has_plus_minus ? arg + 1 : arg;
863 if (is_newly_obsolete(arg, &since)) {
864 char version[256];
865 since.to_string(version, sizeof(version));
866 warning("ignoring option %s; support was removed in %s", argname, version);
867 return true;
868 }
870 // For locked flags, report a custom error message if available.
871 // Otherwise, report the standard unrecognized VM option.
873 size_t arg_len;
874 const char* equal_sign = strchr(argname, '=');
875 if (equal_sign == NULL) {
876 arg_len = strlen(argname);
877 } else {
878 arg_len = equal_sign - argname;
879 }
881 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true);
882 if (found_flag != NULL) {
883 char locked_message_buf[BUFLEN];
884 found_flag->get_locked_message(locked_message_buf, BUFLEN);
885 if (strlen(locked_message_buf) == 0) {
886 if (found_flag->is_bool() && !has_plus_minus) {
887 jio_fprintf(defaultStream::error_stream(),
888 "Missing +/- setting for VM option '%s'\n", argname);
889 } else if (!found_flag->is_bool() && has_plus_minus) {
890 jio_fprintf(defaultStream::error_stream(),
891 "Unexpected +/- setting in VM option '%s'\n", argname);
892 } else {
893 jio_fprintf(defaultStream::error_stream(),
894 "Improperly specified VM option '%s'\n", argname);
895 }
896 } else {
897 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
898 }
899 } else {
900 jio_fprintf(defaultStream::error_stream(),
901 "Unrecognized VM option '%s'\n", argname);
902 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
903 if (fuzzy_matched != NULL) {
904 jio_fprintf(defaultStream::error_stream(),
905 "Did you mean '%s%s%s'?\n",
906 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
907 fuzzy_matched->_name,
908 (fuzzy_matched->is_bool()) ? "" : "=<value>");
909 }
910 }
912 // allow for commandline "commenting out" options like -XX:#+Verbose
913 return arg[0] == '#';
914 }
916 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
917 FILE* stream = fopen(file_name, "rb");
918 if (stream == NULL) {
919 if (should_exist) {
920 jio_fprintf(defaultStream::error_stream(),
921 "Could not open settings file %s\n", file_name);
922 return false;
923 } else {
924 return true;
925 }
926 }
928 char token[1024];
929 int pos = 0;
931 bool in_white_space = true;
932 bool in_comment = false;
933 bool in_quote = false;
934 char quote_c = 0;
935 bool result = true;
937 int c = getc(stream);
938 while(c != EOF && pos < (int)(sizeof(token)-1)) {
939 if (in_white_space) {
940 if (in_comment) {
941 if (c == '\n') in_comment = false;
942 } else {
943 if (c == '#') in_comment = true;
944 else if (!isspace(c)) {
945 in_white_space = false;
946 token[pos++] = c;
947 }
948 }
949 } else {
950 if (c == '\n' || (!in_quote && isspace(c))) {
951 // token ends at newline, or at unquoted whitespace
952 // this allows a way to include spaces in string-valued options
953 token[pos] = '\0';
954 logOption(token);
955 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
956 build_jvm_flags(token);
957 pos = 0;
958 in_white_space = true;
959 in_quote = false;
960 } else if (!in_quote && (c == '\'' || c == '"')) {
961 in_quote = true;
962 quote_c = c;
963 } else if (in_quote && (c == quote_c)) {
964 in_quote = false;
965 } else {
966 token[pos++] = c;
967 }
968 }
969 c = getc(stream);
970 }
971 if (pos > 0) {
972 token[pos] = '\0';
973 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
974 build_jvm_flags(token);
975 }
976 fclose(stream);
977 return result;
978 }
980 //=============================================================================================================
981 // Parsing of properties (-D)
983 const char* Arguments::get_property(const char* key) {
984 return PropertyList_get_value(system_properties(), key);
985 }
987 bool Arguments::add_property(const char* prop) {
988 const char* eq = strchr(prop, '=');
989 char* key;
990 // ns must be static--its address may be stored in a SystemProperty object.
991 const static char ns[1] = {0};
992 char* value = (char *)ns;
994 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
995 key = AllocateHeap(key_len + 1, mtInternal);
996 strncpy(key, prop, key_len);
997 key[key_len] = '\0';
999 if (eq != NULL) {
1000 size_t value_len = strlen(prop) - key_len - 1;
1001 value = AllocateHeap(value_len + 1, mtInternal);
1002 strncpy(value, &prop[key_len + 1], value_len + 1);
1003 }
1005 if (strcmp(key, "java.compiler") == 0) {
1006 process_java_compiler_argument(value);
1007 FreeHeap(key);
1008 if (eq != NULL) {
1009 FreeHeap(value);
1010 }
1011 return true;
1012 } else if (strcmp(key, "sun.java.command") == 0) {
1013 _java_command = value;
1015 // Record value in Arguments, but let it get passed to Java.
1016 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1017 // launcher.pid property is private and is processed
1018 // in process_sun_java_launcher_properties();
1019 // the sun.java.launcher property is passed on to the java application
1020 FreeHeap(key);
1021 if (eq != NULL) {
1022 FreeHeap(value);
1023 }
1024 return true;
1025 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1026 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1027 // its value without going through the property list or making a Java call.
1028 _java_vendor_url_bug = value;
1029 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1030 PropertyList_unique_add(&_system_properties, key, value, true);
1031 return true;
1032 }
1033 // Create new property and add at the end of the list
1034 PropertyList_unique_add(&_system_properties, key, value);
1035 return true;
1036 }
1038 //===========================================================================================================
1039 // Setting int/mixed/comp mode flags
1041 void Arguments::set_mode_flags(Mode mode) {
1042 // Set up default values for all flags.
1043 // If you add a flag to any of the branches below,
1044 // add a default value for it here.
1045 set_java_compiler(false);
1046 _mode = mode;
1048 // Ensure Agent_OnLoad has the correct initial values.
1049 // This may not be the final mode; mode may change later in onload phase.
1050 PropertyList_unique_add(&_system_properties, "java.vm.info",
1051 (char*)VM_Version::vm_info_string(), false);
1053 UseInterpreter = true;
1054 UseCompiler = true;
1055 UseLoopCounter = true;
1057 #ifndef ZERO
1058 // Turn these off for mixed and comp. Leave them on for Zero.
1059 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1060 UseFastAccessorMethods = (mode == _int);
1061 }
1062 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1063 UseFastEmptyMethods = (mode == _int);
1064 }
1065 #endif
1067 // Default values may be platform/compiler dependent -
1068 // use the saved values
1069 ClipInlining = Arguments::_ClipInlining;
1070 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1071 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1072 BackgroundCompilation = Arguments::_BackgroundCompilation;
1074 // Change from defaults based on mode
1075 switch (mode) {
1076 default:
1077 ShouldNotReachHere();
1078 break;
1079 case _int:
1080 UseCompiler = false;
1081 UseLoopCounter = false;
1082 AlwaysCompileLoopMethods = false;
1083 UseOnStackReplacement = false;
1084 break;
1085 case _mixed:
1086 // same as default
1087 break;
1088 case _comp:
1089 UseInterpreter = false;
1090 BackgroundCompilation = false;
1091 ClipInlining = false;
1092 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1093 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1094 // compile a level 4 (C2) and then continue executing it.
1095 if (TieredCompilation) {
1096 Tier3InvokeNotifyFreqLog = 0;
1097 Tier4InvocationThreshold = 0;
1098 }
1099 break;
1100 }
1101 }
1103 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1104 // Conflict: required to use shared spaces (-Xshare:on), but
1105 // incompatible command line options were chosen.
1107 static void no_shared_spaces() {
1108 if (RequireSharedSpaces) {
1109 jio_fprintf(defaultStream::error_stream(),
1110 "Class data sharing is inconsistent with other specified options.\n");
1111 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1112 } else {
1113 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1114 }
1115 }
1116 #endif
1118 void Arguments::set_tiered_flags() {
1119 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1120 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1121 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1122 }
1123 if (CompilationPolicyChoice < 2) {
1124 vm_exit_during_initialization(
1125 "Incompatible compilation policy selected", NULL);
1126 }
1127 // Increase the code cache size - tiered compiles a lot more.
1128 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1129 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1130 }
1131 if (!UseInterpreter) { // -Xcomp
1132 Tier3InvokeNotifyFreqLog = 0;
1133 Tier4InvocationThreshold = 0;
1134 }
1135 }
1137 #if INCLUDE_ALL_GCS
1138 static void disable_adaptive_size_policy(const char* collector_name) {
1139 if (UseAdaptiveSizePolicy) {
1140 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1141 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1142 collector_name);
1143 }
1144 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1145 }
1146 }
1148 void Arguments::set_parnew_gc_flags() {
1149 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1150 "control point invariant");
1151 assert(UseParNewGC, "Error");
1153 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1154 disable_adaptive_size_policy("UseParNewGC");
1156 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1157 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1158 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1159 } else if (ParallelGCThreads == 0) {
1160 jio_fprintf(defaultStream::error_stream(),
1161 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1162 vm_exit(1);
1163 }
1165 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1166 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1167 // we set them to 1024 and 1024.
1168 // See CR 6362902.
1169 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1170 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1171 }
1172 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1173 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1174 }
1176 // AlwaysTenure flag should make ParNew promote all at first collection.
1177 // See CR 6362902.
1178 if (AlwaysTenure) {
1179 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1180 }
1181 // When using compressed oops, we use local overflow stacks,
1182 // rather than using a global overflow list chained through
1183 // the klass word of the object's pre-image.
1184 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1185 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1186 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1187 }
1188 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1189 }
1190 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1191 }
1193 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1194 // sparc/solaris for certain applications, but would gain from
1195 // further optimization and tuning efforts, and would almost
1196 // certainly gain from analysis of platform and environment.
1197 void Arguments::set_cms_and_parnew_gc_flags() {
1198 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1199 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1201 // If we are using CMS, we prefer to UseParNewGC,
1202 // unless explicitly forbidden.
1203 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1204 FLAG_SET_ERGO(bool, UseParNewGC, true);
1205 }
1207 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1208 disable_adaptive_size_policy("UseConcMarkSweepGC");
1210 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1211 // as needed.
1212 if (UseParNewGC) {
1213 set_parnew_gc_flags();
1214 }
1216 size_t max_heap = align_size_down(MaxHeapSize,
1217 CardTableRS::ct_max_alignment_constraint());
1219 // Now make adjustments for CMS
1220 intx tenuring_default = (intx)6;
1221 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1223 // Preferred young gen size for "short" pauses:
1224 // upper bound depends on # of threads and NewRatio.
1225 const uintx parallel_gc_threads =
1226 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1227 const size_t preferred_max_new_size_unaligned =
1228 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1229 size_t preferred_max_new_size =
1230 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1232 // Unless explicitly requested otherwise, size young gen
1233 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1235 // If either MaxNewSize or NewRatio is set on the command line,
1236 // assume the user is trying to set the size of the young gen.
1237 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1239 // Set MaxNewSize to our calculated preferred_max_new_size unless
1240 // NewSize was set on the command line and it is larger than
1241 // preferred_max_new_size.
1242 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1243 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1244 } else {
1245 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1246 }
1247 if (PrintGCDetails && Verbose) {
1248 // Too early to use gclog_or_tty
1249 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1250 }
1252 // Code along this path potentially sets NewSize and OldSize
1253 if (PrintGCDetails && Verbose) {
1254 // Too early to use gclog_or_tty
1255 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1256 " initial_heap_size: " SIZE_FORMAT
1257 " max_heap: " SIZE_FORMAT,
1258 min_heap_size(), InitialHeapSize, max_heap);
1259 }
1260 size_t min_new = preferred_max_new_size;
1261 if (FLAG_IS_CMDLINE(NewSize)) {
1262 min_new = NewSize;
1263 }
1264 if (max_heap > min_new && min_heap_size() > min_new) {
1265 // Unless explicitly requested otherwise, make young gen
1266 // at least min_new, and at most preferred_max_new_size.
1267 if (FLAG_IS_DEFAULT(NewSize)) {
1268 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1269 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1270 if (PrintGCDetails && Verbose) {
1271 // Too early to use gclog_or_tty
1272 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1273 }
1274 }
1275 // Unless explicitly requested otherwise, size old gen
1276 // so it's NewRatio x of NewSize.
1277 if (FLAG_IS_DEFAULT(OldSize)) {
1278 if (max_heap > NewSize) {
1279 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1280 if (PrintGCDetails && Verbose) {
1281 // Too early to use gclog_or_tty
1282 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1283 }
1284 }
1285 }
1286 }
1287 }
1288 // Unless explicitly requested otherwise, definitely
1289 // promote all objects surviving "tenuring_default" scavenges.
1290 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1291 FLAG_IS_DEFAULT(SurvivorRatio)) {
1292 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1293 }
1294 // If we decided above (or user explicitly requested)
1295 // `promote all' (via MaxTenuringThreshold := 0),
1296 // prefer minuscule survivor spaces so as not to waste
1297 // space for (non-existent) survivors
1298 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1299 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1300 }
1301 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1302 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1303 // This is done in order to make ParNew+CMS configuration to work
1304 // with YoungPLABSize and OldPLABSize options.
1305 // See CR 6362902.
1306 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1307 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1308 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1309 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1310 // the value (either from the command line or ergonomics) of
1311 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1312 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1313 } else {
1314 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1315 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1316 // we'll let it to take precedence.
1317 jio_fprintf(defaultStream::error_stream(),
1318 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1319 " options are specified for the CMS collector."
1320 " CMSParPromoteBlocksToClaim will take precedence.\n");
1321 }
1322 }
1323 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1324 // OldPLAB sizing manually turned off: Use a larger default setting,
1325 // unless it was manually specified. This is because a too-low value
1326 // will slow down scavenges.
1327 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1328 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1329 }
1330 }
1331 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1332 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1333 // If either of the static initialization defaults have changed, note this
1334 // modification.
1335 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1336 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1337 }
1338 if (PrintGCDetails && Verbose) {
1339 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1340 MarkStackSize / K, MarkStackSizeMax / K);
1341 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1342 }
1343 }
1344 #endif // INCLUDE_ALL_GCS
1346 void set_object_alignment() {
1347 // Object alignment.
1348 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1349 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1350 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1351 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1352 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1353 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1355 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1356 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1358 // Oop encoding heap max
1359 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1361 #if INCLUDE_ALL_GCS
1362 // Set CMS global values
1363 CompactibleFreeListSpace::set_cms_values();
1364 #endif // INCLUDE_ALL_GCS
1365 }
1367 bool verify_object_alignment() {
1368 // Object alignment.
1369 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1370 jio_fprintf(defaultStream::error_stream(),
1371 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1372 (int)ObjectAlignmentInBytes);
1373 return false;
1374 }
1375 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1376 jio_fprintf(defaultStream::error_stream(),
1377 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1378 (int)ObjectAlignmentInBytes, BytesPerLong);
1379 return false;
1380 }
1381 // It does not make sense to have big object alignment
1382 // since a space lost due to alignment will be greater
1383 // then a saved space from compressed oops.
1384 if ((int)ObjectAlignmentInBytes > 256) {
1385 jio_fprintf(defaultStream::error_stream(),
1386 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1387 (int)ObjectAlignmentInBytes);
1388 return false;
1389 }
1390 // In case page size is very small.
1391 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1392 jio_fprintf(defaultStream::error_stream(),
1393 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1394 (int)ObjectAlignmentInBytes, os::vm_page_size());
1395 return false;
1396 }
1397 return true;
1398 }
1400 uintx Arguments::max_heap_for_compressed_oops() {
1401 // Avoid sign flip.
1402 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1403 // We need to fit both the NULL page and the heap into the memory budget, while
1404 // keeping alignment constraints of the heap. To guarantee the latter, as the
1405 // NULL page is located before the heap, we pad the NULL page to the conservative
1406 // maximum alignment that the GC may ever impose upon the heap.
1407 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1408 _conservative_max_heap_alignment);
1410 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1411 NOT_LP64(ShouldNotReachHere(); return 0);
1412 }
1414 bool Arguments::should_auto_select_low_pause_collector() {
1415 if (UseAutoGCSelectPolicy &&
1416 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1417 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1418 if (PrintGCDetails) {
1419 // Cannot use gclog_or_tty yet.
1420 tty->print_cr("Automatic selection of the low pause collector"
1421 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1422 }
1423 return true;
1424 }
1425 return false;
1426 }
1428 void Arguments::set_use_compressed_oops() {
1429 #ifndef ZERO
1430 #ifdef _LP64
1431 // MaxHeapSize is not set up properly at this point, but
1432 // the only value that can override MaxHeapSize if we are
1433 // to use UseCompressedOops is InitialHeapSize.
1434 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1436 if (max_heap_size <= max_heap_for_compressed_oops()) {
1437 #if !defined(COMPILER1) || defined(TIERED)
1438 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1439 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1440 }
1441 #endif
1442 #ifdef _WIN64
1443 if (UseLargePages && UseCompressedOops) {
1444 // Cannot allocate guard pages for implicit checks in indexed addressing
1445 // mode, when large pages are specified on windows.
1446 // This flag could be switched ON if narrow oop base address is set to 0,
1447 // see code in Universe::initialize_heap().
1448 Universe::set_narrow_oop_use_implicit_null_checks(false);
1449 }
1450 #endif // _WIN64
1451 } else {
1452 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1453 warning("Max heap size too large for Compressed Oops");
1454 FLAG_SET_DEFAULT(UseCompressedOops, false);
1455 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1456 }
1457 }
1458 #endif // _LP64
1459 #endif // ZERO
1460 }
1463 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1464 // set_use_compressed_oops().
1465 void Arguments::set_use_compressed_klass_ptrs() {
1466 #ifndef ZERO
1467 #ifdef _LP64
1468 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1469 if (!UseCompressedOops) {
1470 if (UseCompressedClassPointers) {
1471 warning("UseCompressedClassPointers requires UseCompressedOops");
1472 }
1473 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1474 } else {
1475 // Turn on UseCompressedClassPointers too
1476 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1477 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1478 }
1479 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1480 if (UseCompressedClassPointers) {
1481 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1482 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1483 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1484 }
1485 }
1486 }
1487 #endif // _LP64
1488 #endif // !ZERO
1489 }
1491 void Arguments::set_conservative_max_heap_alignment() {
1492 // The conservative maximum required alignment for the heap is the maximum of
1493 // the alignments imposed by several sources: any requirements from the heap
1494 // itself, the collector policy and the maximum page size we may run the VM
1495 // with.
1496 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1497 #if INCLUDE_ALL_GCS
1498 if (UseParallelGC) {
1499 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1500 } else if (UseG1GC) {
1501 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1502 }
1503 #endif // INCLUDE_ALL_GCS
1504 _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(),
1505 CollectorPolicy::compute_heap_alignment());
1506 }
1508 void Arguments::set_ergonomics_flags() {
1510 if (os::is_server_class_machine()) {
1511 // If no other collector is requested explicitly,
1512 // let the VM select the collector based on
1513 // machine class and automatic selection policy.
1514 if (!UseSerialGC &&
1515 !UseConcMarkSweepGC &&
1516 !UseG1GC &&
1517 !UseParNewGC &&
1518 FLAG_IS_DEFAULT(UseParallelGC)) {
1519 if (should_auto_select_low_pause_collector()) {
1520 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1521 } else {
1522 FLAG_SET_ERGO(bool, UseParallelGC, true);
1523 }
1524 }
1525 }
1526 #ifdef COMPILER2
1527 // Shared spaces work fine with other GCs but causes bytecode rewriting
1528 // to be disabled, which hurts interpreter performance and decreases
1529 // server performance. When -server is specified, keep the default off
1530 // unless it is asked for. Future work: either add bytecode rewriting
1531 // at link time, or rewrite bytecodes in non-shared methods.
1532 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1533 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1534 no_shared_spaces();
1535 }
1536 #endif
1538 set_conservative_max_heap_alignment();
1540 #ifndef ZERO
1541 #ifdef _LP64
1542 set_use_compressed_oops();
1544 // set_use_compressed_klass_ptrs() must be called after calling
1545 // set_use_compressed_oops().
1546 set_use_compressed_klass_ptrs();
1548 // Also checks that certain machines are slower with compressed oops
1549 // in vm_version initialization code.
1550 #endif // _LP64
1551 #endif // !ZERO
1552 }
1554 void Arguments::set_parallel_gc_flags() {
1555 assert(UseParallelGC || UseParallelOldGC, "Error");
1556 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1557 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1558 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1559 }
1560 FLAG_SET_DEFAULT(UseParallelGC, true);
1562 // If no heap maximum was requested explicitly, use some reasonable fraction
1563 // of the physical memory, up to a maximum of 1GB.
1564 FLAG_SET_DEFAULT(ParallelGCThreads,
1565 Abstract_VM_Version::parallel_worker_threads());
1566 if (ParallelGCThreads == 0) {
1567 jio_fprintf(defaultStream::error_stream(),
1568 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1569 vm_exit(1);
1570 }
1573 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1574 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1575 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1576 // See CR 6362902 for details.
1577 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1578 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1579 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1580 }
1581 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1582 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1583 }
1584 }
1586 if (UseParallelOldGC) {
1587 // Par compact uses lower default values since they are treated as
1588 // minimums. These are different defaults because of the different
1589 // interpretation and are not ergonomically set.
1590 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1591 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1592 }
1593 }
1594 }
1596 void Arguments::set_g1_gc_flags() {
1597 assert(UseG1GC, "Error");
1598 #ifdef COMPILER1
1599 FastTLABRefill = false;
1600 #endif
1601 FLAG_SET_DEFAULT(ParallelGCThreads,
1602 Abstract_VM_Version::parallel_worker_threads());
1603 if (ParallelGCThreads == 0) {
1604 FLAG_SET_DEFAULT(ParallelGCThreads,
1605 Abstract_VM_Version::parallel_worker_threads());
1606 }
1608 // MarkStackSize will be set (if it hasn't been set by the user)
1609 // when concurrent marking is initialized.
1610 // Its value will be based upon the number of parallel marking threads.
1611 // But we do set the maximum mark stack size here.
1612 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1613 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1614 }
1616 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1617 // In G1, we want the default GC overhead goal to be higher than
1618 // say in PS. So we set it here to 10%. Otherwise the heap might
1619 // be expanded more aggressively than we would like it to. In
1620 // fact, even 10% seems to not be high enough in some cases
1621 // (especially small GC stress tests that the main thing they do
1622 // is allocation). We might consider increase it further.
1623 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1624 }
1626 if (PrintGCDetails && Verbose) {
1627 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1628 MarkStackSize / K, MarkStackSizeMax / K);
1629 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1630 }
1631 }
1633 julong Arguments::limit_by_allocatable_memory(julong limit) {
1634 julong max_allocatable;
1635 julong result = limit;
1636 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1637 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1638 }
1639 return result;
1640 }
1642 void Arguments::set_heap_size() {
1643 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1644 // Deprecated flag
1645 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1646 }
1648 const julong phys_mem =
1649 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1650 : (julong)MaxRAM;
1652 // If the maximum heap size has not been set with -Xmx,
1653 // then set it as fraction of the size of physical memory,
1654 // respecting the maximum and minimum sizes of the heap.
1655 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1656 julong reasonable_max = phys_mem / MaxRAMFraction;
1658 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1659 // Small physical memory, so use a minimum fraction of it for the heap
1660 reasonable_max = phys_mem / MinRAMFraction;
1661 } else {
1662 // Not-small physical memory, so require a heap at least
1663 // as large as MaxHeapSize
1664 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1665 }
1666 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1667 // Limit the heap size to ErgoHeapSizeLimit
1668 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1669 }
1670 if (UseCompressedOops) {
1671 // Limit the heap size to the maximum possible when using compressed oops
1672 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1673 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1674 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1675 // but it should be not less than default MaxHeapSize.
1676 max_coop_heap -= HeapBaseMinAddress;
1677 }
1678 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1679 }
1680 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1682 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1683 // An initial heap size was specified on the command line,
1684 // so be sure that the maximum size is consistent. Done
1685 // after call to limit_by_allocatable_memory because that
1686 // method might reduce the allocation size.
1687 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1688 }
1690 if (PrintGCDetails && Verbose) {
1691 // Cannot use gclog_or_tty yet.
1692 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1693 }
1694 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1695 }
1697 // If the minimum or initial heap_size have not been set or requested to be set
1698 // ergonomically, set them accordingly.
1699 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1700 julong reasonable_minimum = (julong)(OldSize + NewSize);
1702 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1704 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1706 if (InitialHeapSize == 0) {
1707 julong reasonable_initial = phys_mem / InitialRAMFraction;
1709 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1710 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1712 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1714 if (PrintGCDetails && Verbose) {
1715 // Cannot use gclog_or_tty yet.
1716 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1717 }
1718 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1719 }
1720 // If the minimum heap size has not been set (via -Xms),
1721 // synchronize with InitialHeapSize to avoid errors with the default value.
1722 if (min_heap_size() == 0) {
1723 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1724 if (PrintGCDetails && Verbose) {
1725 // Cannot use gclog_or_tty yet.
1726 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1727 }
1728 }
1729 }
1730 }
1732 // This must be called after ergonomics because we want bytecode rewriting
1733 // if the server compiler is used, or if UseSharedSpaces is disabled.
1734 void Arguments::set_bytecode_flags() {
1735 // Better not attempt to store into a read-only space.
1736 if (UseSharedSpaces) {
1737 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1738 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1739 }
1741 if (!RewriteBytecodes) {
1742 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1743 }
1744 }
1746 // Aggressive optimization flags -XX:+AggressiveOpts
1747 void Arguments::set_aggressive_opts_flags() {
1748 #ifdef COMPILER2
1749 if (AggressiveUnboxing) {
1750 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1751 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1752 } else if (!EliminateAutoBox) {
1753 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1754 AggressiveUnboxing = false;
1755 }
1756 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1757 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1758 } else if (!DoEscapeAnalysis) {
1759 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1760 AggressiveUnboxing = false;
1761 }
1762 }
1763 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1764 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1765 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1766 }
1767 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1768 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1769 }
1771 // Feed the cache size setting into the JDK
1772 char buffer[1024];
1773 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1774 add_property(buffer);
1775 }
1776 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1777 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1778 }
1779 #endif
1781 if (AggressiveOpts) {
1782 // Sample flag setting code
1783 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1784 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1785 // }
1786 }
1787 }
1789 //===========================================================================================================
1790 // Parsing of java.compiler property
1792 void Arguments::process_java_compiler_argument(char* arg) {
1793 // For backwards compatibility, Djava.compiler=NONE or ""
1794 // causes us to switch to -Xint mode UNLESS -Xdebug
1795 // is also specified.
1796 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1797 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1798 }
1799 }
1801 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1802 _sun_java_launcher = strdup(launcher);
1803 if (strcmp("gamma", _sun_java_launcher) == 0) {
1804 _created_by_gamma_launcher = true;
1805 }
1806 }
1808 bool Arguments::created_by_java_launcher() {
1809 assert(_sun_java_launcher != NULL, "property must have value");
1810 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1811 }
1813 bool Arguments::created_by_gamma_launcher() {
1814 return _created_by_gamma_launcher;
1815 }
1817 //===========================================================================================================
1818 // Parsing of main arguments
1820 bool Arguments::verify_interval(uintx val, uintx min,
1821 uintx max, const char* name) {
1822 // Returns true iff value is in the inclusive interval [min..max]
1823 // false, otherwise.
1824 if (val >= min && val <= max) {
1825 return true;
1826 }
1827 jio_fprintf(defaultStream::error_stream(),
1828 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1829 " and " UINTX_FORMAT "\n",
1830 name, val, min, max);
1831 return false;
1832 }
1834 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1835 // Returns true if given value is at least specified min threshold
1836 // false, otherwise.
1837 if (val >= min ) {
1838 return true;
1839 }
1840 jio_fprintf(defaultStream::error_stream(),
1841 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1842 name, val, min);
1843 return false;
1844 }
1846 bool Arguments::verify_percentage(uintx value, const char* name) {
1847 if (value <= 100) {
1848 return true;
1849 }
1850 jio_fprintf(defaultStream::error_stream(),
1851 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1852 name, value);
1853 return false;
1854 }
1856 #if !INCLUDE_ALL_GCS
1857 #ifdef ASSERT
1858 static bool verify_serial_gc_flags() {
1859 return (UseSerialGC &&
1860 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1861 UseParallelGC || UseParallelOldGC));
1862 }
1863 #endif // ASSERT
1864 #endif // INCLUDE_ALL_GCS
1866 // check if do gclog rotation
1867 // +UseGCLogFileRotation is a must,
1868 // no gc log rotation when log file not supplied or
1869 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1870 void check_gclog_consistency() {
1871 if (UseGCLogFileRotation) {
1872 if ((Arguments::gc_log_filename() == NULL) ||
1873 (NumberOfGCLogFiles == 0) ||
1874 (GCLogFileSize == 0)) {
1875 jio_fprintf(defaultStream::output_stream(),
1876 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>[k|K|m|M|g|G]\n"
1877 "where num_of_file > 0 and num_of_size > 0\n"
1878 "GC log rotation is turned off\n");
1879 UseGCLogFileRotation = false;
1880 }
1881 }
1883 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1884 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1885 jio_fprintf(defaultStream::output_stream(),
1886 "GCLogFileSize changed to minimum 8K\n");
1887 }
1888 }
1890 // This function is called for -Xloggc:<filename>, it can be used
1891 // to check if a given file name(or string) conforms to the following
1892 // specification:
1893 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1894 // %p and %t only allowed once. We only limit usage of filename not path
1895 bool is_filename_valid(const char *file_name) {
1896 const char* p = file_name;
1897 char file_sep = os::file_separator()[0];
1898 const char* cp;
1899 // skip prefix path
1900 for (cp = file_name; *cp != '\0'; cp++) {
1901 if (*cp == '/' || *cp == file_sep) {
1902 p = cp + 1;
1903 }
1904 }
1906 int count_p = 0;
1907 int count_t = 0;
1908 while (*p != '\0') {
1909 if ((*p >= '0' && *p <= '9') ||
1910 (*p >= 'A' && *p <= 'Z') ||
1911 (*p >= 'a' && *p <= 'z') ||
1912 *p == '-' ||
1913 *p == '_' ||
1914 *p == '.') {
1915 p++;
1916 continue;
1917 }
1918 if (*p == '%') {
1919 if(*(p + 1) == 'p') {
1920 p += 2;
1921 count_p ++;
1922 continue;
1923 }
1924 if (*(p + 1) == 't') {
1925 p += 2;
1926 count_t ++;
1927 continue;
1928 }
1929 }
1930 return false;
1931 }
1932 return count_p < 2 && count_t < 2;
1933 }
1935 // Check consistency of GC selection
1936 bool Arguments::check_gc_consistency() {
1937 check_gclog_consistency();
1938 bool status = true;
1939 // Ensure that the user has not selected conflicting sets
1940 // of collectors. [Note: this check is merely a user convenience;
1941 // collectors over-ride each other so that only a non-conflicting
1942 // set is selected; however what the user gets is not what they
1943 // may have expected from the combination they asked for. It's
1944 // better to reduce user confusion by not allowing them to
1945 // select conflicting combinations.
1946 uint i = 0;
1947 if (UseSerialGC) i++;
1948 if (UseConcMarkSweepGC || UseParNewGC) i++;
1949 if (UseParallelGC || UseParallelOldGC) i++;
1950 if (UseG1GC) i++;
1951 if (i > 1) {
1952 jio_fprintf(defaultStream::error_stream(),
1953 "Conflicting collector combinations in option list; "
1954 "please refer to the release notes for the combinations "
1955 "allowed\n");
1956 status = false;
1957 }
1958 return status;
1959 }
1961 void Arguments::check_deprecated_gcs() {
1962 if (UseConcMarkSweepGC && !UseParNewGC) {
1963 warning("Using the DefNew young collector with the CMS collector is deprecated "
1964 "and will likely be removed in a future release");
1965 }
1967 if (UseParNewGC && !UseConcMarkSweepGC) {
1968 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
1969 // set up UseSerialGC properly, so that can't be used in the check here.
1970 warning("Using the ParNew young collector with the Serial old collector is deprecated "
1971 "and will likely be removed in a future release");
1972 }
1974 if (CMSIncrementalMode) {
1975 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
1976 }
1977 }
1979 void Arguments::check_deprecated_gc_flags() {
1980 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
1981 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
1982 "and will likely be removed in future release");
1983 }
1984 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
1985 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
1986 "Use MaxRAMFraction instead.");
1987 }
1988 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
1989 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
1990 }
1991 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
1992 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
1993 }
1994 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
1995 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
1996 }
1997 }
1999 // Check stack pages settings
2000 bool Arguments::check_stack_pages()
2001 {
2002 bool status = true;
2003 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2004 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2005 // greater stack shadow pages can't generate instruction to bang stack
2006 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2007 return status;
2008 }
2010 // Check the consistency of vm_init_args
2011 bool Arguments::check_vm_args_consistency() {
2012 // Method for adding checks for flag consistency.
2013 // The intent is to warn the user of all possible conflicts,
2014 // before returning an error.
2015 // Note: Needs platform-dependent factoring.
2016 bool status = true;
2018 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2019 // builds so the cost of stack banging can be measured.
2020 #if (defined(PRODUCT) && defined(SOLARIS))
2021 if (!UseBoundThreads && !UseStackBanging) {
2022 jio_fprintf(defaultStream::error_stream(),
2023 "-UseStackBanging conflicts with -UseBoundThreads\n");
2025 status = false;
2026 }
2027 #endif
2029 if (TLABRefillWasteFraction == 0) {
2030 jio_fprintf(defaultStream::error_stream(),
2031 "TLABRefillWasteFraction should be a denominator, "
2032 "not " SIZE_FORMAT "\n",
2033 TLABRefillWasteFraction);
2034 status = false;
2035 }
2037 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2038 "AdaptiveSizePolicyWeight");
2039 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2040 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
2041 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
2043 // Divide by bucket size to prevent a large size from causing rollover when
2044 // calculating amount of memory needed to be allocated for the String table.
2045 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2046 (max_uintx / StringTable::bucket_size()), "StringTable size");
2048 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2049 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2051 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
2052 jio_fprintf(defaultStream::error_stream(),
2053 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2054 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
2055 MinHeapFreeRatio, MaxHeapFreeRatio);
2056 status = false;
2057 }
2058 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2059 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
2061 // Min/MaxMetaspaceFreeRatio
2062 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2063 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2065 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2066 jio_fprintf(defaultStream::error_stream(),
2067 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2068 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2069 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2070 MinMetaspaceFreeRatio,
2071 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2072 MaxMetaspaceFreeRatio);
2073 status = false;
2074 }
2076 // Trying to keep 100% free is not practical
2077 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2079 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2080 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2081 }
2083 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2084 // Settings to encourage splitting.
2085 if (!FLAG_IS_CMDLINE(NewRatio)) {
2086 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2087 }
2088 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2089 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2090 }
2091 }
2093 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2094 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2095 if (GCTimeLimit == 100) {
2096 // Turn off gc-overhead-limit-exceeded checks
2097 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2098 }
2100 status = status && check_gc_consistency();
2101 status = status && check_stack_pages();
2103 if (CMSIncrementalMode) {
2104 if (!UseConcMarkSweepGC) {
2105 jio_fprintf(defaultStream::error_stream(),
2106 "error: invalid argument combination.\n"
2107 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2108 "selected in order\nto use CMSIncrementalMode.\n");
2109 status = false;
2110 } else {
2111 status = status && verify_percentage(CMSIncrementalDutyCycle,
2112 "CMSIncrementalDutyCycle");
2113 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2114 "CMSIncrementalDutyCycleMin");
2115 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2116 "CMSIncrementalSafetyFactor");
2117 status = status && verify_percentage(CMSIncrementalOffset,
2118 "CMSIncrementalOffset");
2119 status = status && verify_percentage(CMSExpAvgFactor,
2120 "CMSExpAvgFactor");
2121 // If it was not set on the command line, set
2122 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2123 if (CMSInitiatingOccupancyFraction < 0) {
2124 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2125 }
2126 }
2127 }
2129 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2130 // insists that we hold the requisite locks so that the iteration is
2131 // MT-safe. For the verification at start-up and shut-down, we don't
2132 // yet have a good way of acquiring and releasing these locks,
2133 // which are not visible at the CollectedHeap level. We want to
2134 // be able to acquire these locks and then do the iteration rather
2135 // than just disable the lock verification. This will be fixed under
2136 // bug 4788986.
2137 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2138 if (VerifyDuringStartup) {
2139 warning("Heap verification at start-up disabled "
2140 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2141 VerifyDuringStartup = false; // Disable verification at start-up
2142 }
2144 if (VerifyBeforeExit) {
2145 warning("Heap verification at shutdown disabled "
2146 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2147 VerifyBeforeExit = false; // Disable verification at shutdown
2148 }
2149 }
2151 // Note: only executed in non-PRODUCT mode
2152 if (!UseAsyncConcMarkSweepGC &&
2153 (ExplicitGCInvokesConcurrent ||
2154 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2155 jio_fprintf(defaultStream::error_stream(),
2156 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2157 " with -UseAsyncConcMarkSweepGC");
2158 status = false;
2159 }
2161 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2163 #if INCLUDE_ALL_GCS
2164 if (UseG1GC) {
2165 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2166 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2167 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2169 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2170 "InitiatingHeapOccupancyPercent");
2171 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2172 "G1RefProcDrainInterval");
2173 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2174 "G1ConcMarkStepDurationMillis");
2175 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2176 "G1ConcRSHotCardLimit");
2177 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2178 "G1ConcRSLogCacheSize");
2179 }
2180 if (UseConcMarkSweepGC) {
2181 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2182 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2183 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2184 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2186 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2188 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2189 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2190 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2192 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2194 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2195 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2197 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2198 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2199 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2201 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2203 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2205 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2206 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2207 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2208 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2209 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2210 }
2212 if (UseParallelGC || UseParallelOldGC) {
2213 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2214 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2216 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2217 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2219 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2220 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2222 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2224 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2225 }
2226 #endif // INCLUDE_ALL_GCS
2228 status = status && verify_interval(RefDiscoveryPolicy,
2229 ReferenceProcessor::DiscoveryPolicyMin,
2230 ReferenceProcessor::DiscoveryPolicyMax,
2231 "RefDiscoveryPolicy");
2233 // Limit the lower bound of this flag to 1 as it is used in a division
2234 // expression.
2235 status = status && verify_interval(TLABWasteTargetPercent,
2236 1, 100, "TLABWasteTargetPercent");
2238 status = status && verify_object_alignment();
2240 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2241 "CompressedClassSpaceSize");
2243 status = status && verify_interval(MarkStackSizeMax,
2244 1, (max_jint - 1), "MarkStackSizeMax");
2245 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2247 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2249 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2251 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2253 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2254 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2256 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2258 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2259 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2260 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2261 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2263 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2264 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2266 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2267 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2268 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2270 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2271 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2273 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2274 // just for that, so hardcode here.
2275 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2276 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2277 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2278 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2280 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2282 if (PrintNMTStatistics) {
2283 #if INCLUDE_NMT
2284 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2285 #endif // INCLUDE_NMT
2286 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2287 PrintNMTStatistics = false;
2288 #if INCLUDE_NMT
2289 }
2290 #endif
2291 }
2293 // Need to limit the extent of the padding to reasonable size.
2294 // 8K is well beyond the reasonable HW cache line size, even with the
2295 // aggressive prefetching, while still leaving the room for segregating
2296 // among the distinct pages.
2297 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2298 jio_fprintf(defaultStream::error_stream(),
2299 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2300 ContendedPaddingWidth, 0, 8192);
2301 status = false;
2302 }
2304 // Need to enforce the padding not to break the existing field alignments.
2305 // It is sufficient to check against the largest type size.
2306 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2307 jio_fprintf(defaultStream::error_stream(),
2308 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2309 ContendedPaddingWidth, BytesPerLong);
2310 status = false;
2311 }
2313 // Check lower bounds of the code cache
2314 // Template Interpreter code is approximately 3X larger in debug builds.
2315 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2316 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2317 jio_fprintf(defaultStream::error_stream(),
2318 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2319 os::vm_page_size()/K);
2320 status = false;
2321 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2322 jio_fprintf(defaultStream::error_stream(),
2323 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2324 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2325 status = false;
2326 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2327 jio_fprintf(defaultStream::error_stream(),
2328 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2329 min_code_cache_size/K);
2330 status = false;
2331 } else if (ReservedCodeCacheSize > 2*G) {
2332 // Code cache size larger than MAXINT is not supported.
2333 jio_fprintf(defaultStream::error_stream(),
2334 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2335 (2*G)/M);
2336 status = false;
2337 }
2339 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2340 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2342 status &= verify_interval(SafepointPollOffset, 0, os::vm_page_size() - BytesPerWord, "SafepointPollOffset");
2344 return status;
2345 }
2347 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2348 const char* option_type) {
2349 if (ignore) return false;
2351 const char* spacer = " ";
2352 if (option_type == NULL) {
2353 option_type = ++spacer; // Set both to the empty string.
2354 }
2356 if (os::obsolete_option(option)) {
2357 jio_fprintf(defaultStream::error_stream(),
2358 "Obsolete %s%soption: %s\n", option_type, spacer,
2359 option->optionString);
2360 return false;
2361 } else {
2362 jio_fprintf(defaultStream::error_stream(),
2363 "Unrecognized %s%soption: %s\n", option_type, spacer,
2364 option->optionString);
2365 return true;
2366 }
2367 }
2369 static const char* user_assertion_options[] = {
2370 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2371 };
2373 static const char* system_assertion_options[] = {
2374 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2375 };
2377 // Return true if any of the strings in null-terminated array 'names' matches.
2378 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2379 // the option must match exactly.
2380 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2381 bool tail_allowed) {
2382 for (/* empty */; *names != NULL; ++names) {
2383 if (match_option(option, *names, tail)) {
2384 if (**tail == '\0' || tail_allowed && **tail == ':') {
2385 return true;
2386 }
2387 }
2388 }
2389 return false;
2390 }
2392 bool Arguments::parse_uintx(const char* value,
2393 uintx* uintx_arg,
2394 uintx min_size) {
2396 // Check the sign first since atomull() parses only unsigned values.
2397 bool value_is_positive = !(*value == '-');
2399 if (value_is_positive) {
2400 julong n;
2401 bool good_return = atomull(value, &n);
2402 if (good_return) {
2403 bool above_minimum = n >= min_size;
2404 bool value_is_too_large = n > max_uintx;
2406 if (above_minimum && !value_is_too_large) {
2407 *uintx_arg = n;
2408 return true;
2409 }
2410 }
2411 }
2412 return false;
2413 }
2415 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2416 julong* long_arg,
2417 julong min_size) {
2418 if (!atomull(s, long_arg)) return arg_unreadable;
2419 return check_memory_size(*long_arg, min_size);
2420 }
2422 // Parse JavaVMInitArgs structure
2424 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2425 // For components of the system classpath.
2426 SysClassPath scp(Arguments::get_sysclasspath());
2427 bool scp_assembly_required = false;
2429 // Save default settings for some mode flags
2430 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2431 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2432 Arguments::_ClipInlining = ClipInlining;
2433 Arguments::_BackgroundCompilation = BackgroundCompilation;
2435 // Setup flags for mixed which is the default
2436 set_mode_flags(_mixed);
2438 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2439 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2440 if (result != JNI_OK) {
2441 return result;
2442 }
2444 // Parse JavaVMInitArgs structure passed in
2445 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2446 if (result != JNI_OK) {
2447 return result;
2448 }
2450 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2451 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2452 if (result != JNI_OK) {
2453 return result;
2454 }
2456 // Do final processing now that all arguments have been parsed
2457 result = finalize_vm_init_args(&scp, scp_assembly_required);
2458 if (result != JNI_OK) {
2459 return result;
2460 }
2462 return JNI_OK;
2463 }
2465 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2466 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2467 // are dealing with -agentpath (case where name is a path), otherwise with
2468 // -agentlib
2469 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2470 char *_name;
2471 const char *_hprof = "hprof", *_jdwp = "jdwp";
2472 size_t _len_hprof, _len_jdwp, _len_prefix;
2474 if (is_path) {
2475 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2476 return false;
2477 }
2479 _name++; // skip past last path separator
2480 _len_prefix = strlen(JNI_LIB_PREFIX);
2482 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2483 return false;
2484 }
2486 _name += _len_prefix;
2487 _len_hprof = strlen(_hprof);
2488 _len_jdwp = strlen(_jdwp);
2490 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2491 _name += _len_hprof;
2492 }
2493 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2494 _name += _len_jdwp;
2495 }
2496 else {
2497 return false;
2498 }
2500 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2501 return false;
2502 }
2504 return true;
2505 }
2507 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2508 return true;
2509 }
2511 return false;
2512 }
2514 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2515 SysClassPath* scp_p,
2516 bool* scp_assembly_required_p,
2517 Flag::Flags origin) {
2518 // Remaining part of option string
2519 const char* tail;
2521 // iterate over arguments
2522 for (int index = 0; index < args->nOptions; index++) {
2523 bool is_absolute_path = false; // for -agentpath vs -agentlib
2525 const JavaVMOption* option = args->options + index;
2527 if (!match_option(option, "-Djava.class.path", &tail) &&
2528 !match_option(option, "-Dsun.java.command", &tail) &&
2529 !match_option(option, "-Dsun.java.launcher", &tail)) {
2531 // add all jvm options to the jvm_args string. This string
2532 // is used later to set the java.vm.args PerfData string constant.
2533 // the -Djava.class.path and the -Dsun.java.command options are
2534 // omitted from jvm_args string as each have their own PerfData
2535 // string constant object.
2536 build_jvm_args(option->optionString);
2537 }
2539 // -verbose:[class/gc/jni]
2540 if (match_option(option, "-verbose", &tail)) {
2541 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2542 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2543 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2544 } else if (!strcmp(tail, ":gc")) {
2545 FLAG_SET_CMDLINE(bool, PrintGC, true);
2546 } else if (!strcmp(tail, ":jni")) {
2547 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2548 }
2549 // -da / -ea / -disableassertions / -enableassertions
2550 // These accept an optional class/package name separated by a colon, e.g.,
2551 // -da:java.lang.Thread.
2552 } else if (match_option(option, user_assertion_options, &tail, true)) {
2553 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2554 if (*tail == '\0') {
2555 JavaAssertions::setUserClassDefault(enable);
2556 } else {
2557 assert(*tail == ':', "bogus match by match_option()");
2558 JavaAssertions::addOption(tail + 1, enable);
2559 }
2560 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2561 } else if (match_option(option, system_assertion_options, &tail, false)) {
2562 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2563 JavaAssertions::setSystemClassDefault(enable);
2564 // -bootclasspath:
2565 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2566 scp_p->reset_path(tail);
2567 *scp_assembly_required_p = true;
2568 // -bootclasspath/a:
2569 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2570 scp_p->add_suffix(tail);
2571 *scp_assembly_required_p = true;
2572 // -bootclasspath/p:
2573 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2574 scp_p->add_prefix(tail);
2575 *scp_assembly_required_p = true;
2576 // -Xrun
2577 } else if (match_option(option, "-Xrun", &tail)) {
2578 if (tail != NULL) {
2579 const char* pos = strchr(tail, ':');
2580 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2581 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2582 name[len] = '\0';
2584 char *options = NULL;
2585 if(pos != NULL) {
2586 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2587 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2588 }
2589 #if !INCLUDE_JVMTI
2590 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2591 jio_fprintf(defaultStream::error_stream(),
2592 "Profiling and debugging agents are not supported in this VM\n");
2593 return JNI_ERR;
2594 }
2595 #endif // !INCLUDE_JVMTI
2596 add_init_library(name, options);
2597 }
2598 // -agentlib and -agentpath
2599 } else if (match_option(option, "-agentlib:", &tail) ||
2600 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2601 if(tail != NULL) {
2602 const char* pos = strchr(tail, '=');
2603 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2604 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2605 name[len] = '\0';
2607 char *options = NULL;
2608 if(pos != NULL) {
2609 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2610 }
2611 #if !INCLUDE_JVMTI
2612 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2613 jio_fprintf(defaultStream::error_stream(),
2614 "Profiling and debugging agents are not supported in this VM\n");
2615 return JNI_ERR;
2616 }
2617 #endif // !INCLUDE_JVMTI
2618 add_init_agent(name, options, is_absolute_path);
2619 }
2620 // -javaagent
2621 } else if (match_option(option, "-javaagent:", &tail)) {
2622 #if !INCLUDE_JVMTI
2623 jio_fprintf(defaultStream::error_stream(),
2624 "Instrumentation agents are not supported in this VM\n");
2625 return JNI_ERR;
2626 #else
2627 if(tail != NULL) {
2628 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2629 add_init_agent("instrument", options, false);
2630 }
2631 #endif // !INCLUDE_JVMTI
2632 // -Xnoclassgc
2633 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2634 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2635 // -Xincgc: i-CMS
2636 } else if (match_option(option, "-Xincgc", &tail)) {
2637 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2638 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2639 // -Xnoincgc: no i-CMS
2640 } else if (match_option(option, "-Xnoincgc", &tail)) {
2641 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2642 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2643 // -Xconcgc
2644 } else if (match_option(option, "-Xconcgc", &tail)) {
2645 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2646 // -Xnoconcgc
2647 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2648 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2649 // -Xbatch
2650 } else if (match_option(option, "-Xbatch", &tail)) {
2651 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2652 // -Xmn for compatibility with other JVM vendors
2653 } else if (match_option(option, "-Xmn", &tail)) {
2654 julong long_initial_young_size = 0;
2655 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2656 if (errcode != arg_in_range) {
2657 jio_fprintf(defaultStream::error_stream(),
2658 "Invalid initial young generation size: %s\n", option->optionString);
2659 describe_range_error(errcode);
2660 return JNI_EINVAL;
2661 }
2662 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2663 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2664 // -Xms
2665 } else if (match_option(option, "-Xms", &tail)) {
2666 julong long_initial_heap_size = 0;
2667 // an initial heap size of 0 means automatically determine
2668 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2669 if (errcode != arg_in_range) {
2670 jio_fprintf(defaultStream::error_stream(),
2671 "Invalid initial heap size: %s\n", option->optionString);
2672 describe_range_error(errcode);
2673 return JNI_EINVAL;
2674 }
2675 set_min_heap_size((uintx)long_initial_heap_size);
2676 // Currently the minimum size and the initial heap sizes are the same.
2677 // Can be overridden with -XX:InitialHeapSize.
2678 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2679 // -Xmx
2680 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2681 julong long_max_heap_size = 0;
2682 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2683 if (errcode != arg_in_range) {
2684 jio_fprintf(defaultStream::error_stream(),
2685 "Invalid maximum heap size: %s\n", option->optionString);
2686 describe_range_error(errcode);
2687 return JNI_EINVAL;
2688 }
2689 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2690 // Xmaxf
2691 } else if (match_option(option, "-Xmaxf", &tail)) {
2692 char* err;
2693 int maxf = (int)(strtod(tail, &err) * 100);
2694 if (*err != '\0' || maxf < 0 || maxf > 100) {
2695 jio_fprintf(defaultStream::error_stream(),
2696 "Bad max heap free percentage size: %s\n",
2697 option->optionString);
2698 return JNI_EINVAL;
2699 } else {
2700 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2701 }
2702 // Xminf
2703 } else if (match_option(option, "-Xminf", &tail)) {
2704 char* err;
2705 int minf = (int)(strtod(tail, &err) * 100);
2706 if (*err != '\0' || minf < 0 || minf > 100) {
2707 jio_fprintf(defaultStream::error_stream(),
2708 "Bad min heap free percentage size: %s\n",
2709 option->optionString);
2710 return JNI_EINVAL;
2711 } else {
2712 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2713 }
2714 // -Xss
2715 } else if (match_option(option, "-Xss", &tail)) {
2716 julong long_ThreadStackSize = 0;
2717 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2718 if (errcode != arg_in_range) {
2719 jio_fprintf(defaultStream::error_stream(),
2720 "Invalid thread stack size: %s\n", option->optionString);
2721 describe_range_error(errcode);
2722 return JNI_EINVAL;
2723 }
2724 // Internally track ThreadStackSize in units of 1024 bytes.
2725 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2726 round_to((int)long_ThreadStackSize, K) / K);
2727 // -Xoss
2728 } else if (match_option(option, "-Xoss", &tail)) {
2729 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2730 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2731 julong long_CodeCacheExpansionSize = 0;
2732 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2733 if (errcode != arg_in_range) {
2734 jio_fprintf(defaultStream::error_stream(),
2735 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2736 os::vm_page_size()/K);
2737 return JNI_EINVAL;
2738 }
2739 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2740 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2741 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2742 julong long_ReservedCodeCacheSize = 0;
2744 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2745 if (errcode != arg_in_range) {
2746 jio_fprintf(defaultStream::error_stream(),
2747 "Invalid maximum code cache size: %s.\n", option->optionString);
2748 return JNI_EINVAL;
2749 }
2750 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2751 //-XX:IncreaseFirstTierCompileThresholdAt=
2752 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2753 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2754 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2755 jio_fprintf(defaultStream::error_stream(),
2756 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2757 option->optionString);
2758 return JNI_EINVAL;
2759 }
2760 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2761 // -green
2762 } else if (match_option(option, "-green", &tail)) {
2763 jio_fprintf(defaultStream::error_stream(),
2764 "Green threads support not available\n");
2765 return JNI_EINVAL;
2766 // -native
2767 } else if (match_option(option, "-native", &tail)) {
2768 // HotSpot always uses native threads, ignore silently for compatibility
2769 // -Xsqnopause
2770 } else if (match_option(option, "-Xsqnopause", &tail)) {
2771 // EVM option, ignore silently for compatibility
2772 // -Xrs
2773 } else if (match_option(option, "-Xrs", &tail)) {
2774 // Classic/EVM option, new functionality
2775 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2776 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2777 // change default internal VM signals used - lower case for back compat
2778 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2779 // -Xoptimize
2780 } else if (match_option(option, "-Xoptimize", &tail)) {
2781 // EVM option, ignore silently for compatibility
2782 // -Xprof
2783 } else if (match_option(option, "-Xprof", &tail)) {
2784 #if INCLUDE_FPROF
2785 _has_profile = true;
2786 #else // INCLUDE_FPROF
2787 jio_fprintf(defaultStream::error_stream(),
2788 "Flat profiling is not supported in this VM.\n");
2789 return JNI_ERR;
2790 #endif // INCLUDE_FPROF
2791 // -Xconcurrentio
2792 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2793 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2794 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2795 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2796 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2797 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2799 // -Xinternalversion
2800 } else if (match_option(option, "-Xinternalversion", &tail)) {
2801 jio_fprintf(defaultStream::output_stream(), "%s\n",
2802 VM_Version::internal_vm_info_string());
2803 vm_exit(0);
2804 #ifndef PRODUCT
2805 // -Xprintflags
2806 } else if (match_option(option, "-Xprintflags", &tail)) {
2807 CommandLineFlags::printFlags(tty, false);
2808 vm_exit(0);
2809 #endif
2810 // -D
2811 } else if (match_option(option, "-D", &tail)) {
2812 if (!add_property(tail)) {
2813 return JNI_ENOMEM;
2814 }
2815 // Out of the box management support
2816 if (match_option(option, "-Dcom.sun.management", &tail)) {
2817 #if INCLUDE_MANAGEMENT
2818 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2819 #else
2820 jio_fprintf(defaultStream::output_stream(),
2821 "-Dcom.sun.management is not supported in this VM.\n");
2822 return JNI_ERR;
2823 #endif
2824 }
2825 // -Xint
2826 } else if (match_option(option, "-Xint", &tail)) {
2827 set_mode_flags(_int);
2828 // -Xmixed
2829 } else if (match_option(option, "-Xmixed", &tail)) {
2830 set_mode_flags(_mixed);
2831 // -Xcomp
2832 } else if (match_option(option, "-Xcomp", &tail)) {
2833 // for testing the compiler; turn off all flags that inhibit compilation
2834 set_mode_flags(_comp);
2835 // -Xshare:dump
2836 } else if (match_option(option, "-Xshare:dump", &tail)) {
2837 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2838 set_mode_flags(_int); // Prevent compilation, which creates objects
2839 // -Xshare:on
2840 } else if (match_option(option, "-Xshare:on", &tail)) {
2841 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2842 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2843 // -Xshare:auto
2844 } else if (match_option(option, "-Xshare:auto", &tail)) {
2845 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2846 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2847 // -Xshare:off
2848 } else if (match_option(option, "-Xshare:off", &tail)) {
2849 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2850 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2851 // -Xverify
2852 } else if (match_option(option, "-Xverify", &tail)) {
2853 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2854 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2855 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2856 } else if (strcmp(tail, ":remote") == 0) {
2857 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2858 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2859 } else if (strcmp(tail, ":none") == 0) {
2860 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2861 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2862 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2863 return JNI_EINVAL;
2864 }
2865 // -Xdebug
2866 } else if (match_option(option, "-Xdebug", &tail)) {
2867 // note this flag has been used, then ignore
2868 set_xdebug_mode(true);
2869 // -Xnoagent
2870 } else if (match_option(option, "-Xnoagent", &tail)) {
2871 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2872 } else if (match_option(option, "-Xboundthreads", &tail)) {
2873 // Bind user level threads to kernel threads (Solaris only)
2874 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2875 } else if (match_option(option, "-Xloggc:", &tail)) {
2876 // Redirect GC output to the file. -Xloggc:<filename>
2877 // ostream_init_log(), when called will use this filename
2878 // to initialize a fileStream.
2879 _gc_log_filename = strdup(tail);
2880 if (!is_filename_valid(_gc_log_filename)) {
2881 jio_fprintf(defaultStream::output_stream(),
2882 "Invalid file name for use with -Xloggc: Filename can only contain the "
2883 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2884 "Note %%p or %%t can only be used once\n", _gc_log_filename);
2885 return JNI_EINVAL;
2886 }
2887 FLAG_SET_CMDLINE(bool, PrintGC, true);
2888 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2890 // JNI hooks
2891 } else if (match_option(option, "-Xcheck", &tail)) {
2892 if (!strcmp(tail, ":jni")) {
2893 #if !INCLUDE_JNI_CHECK
2894 warning("JNI CHECKING is not supported in this VM");
2895 #else
2896 CheckJNICalls = true;
2897 #endif // INCLUDE_JNI_CHECK
2898 } else if (is_bad_option(option, args->ignoreUnrecognized,
2899 "check")) {
2900 return JNI_EINVAL;
2901 }
2902 } else if (match_option(option, "vfprintf", &tail)) {
2903 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2904 } else if (match_option(option, "exit", &tail)) {
2905 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2906 } else if (match_option(option, "abort", &tail)) {
2907 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2908 // -XX:+AggressiveHeap
2909 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2911 // This option inspects the machine and attempts to set various
2912 // parameters to be optimal for long-running, memory allocation
2913 // intensive jobs. It is intended for machines with large
2914 // amounts of cpu and memory.
2916 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2917 // VM, but we may not be able to represent the total physical memory
2918 // available (like having 8gb of memory on a box but using a 32bit VM).
2919 // Thus, we need to make sure we're using a julong for intermediate
2920 // calculations.
2921 julong initHeapSize;
2922 julong total_memory = os::physical_memory();
2924 if (total_memory < (julong)256*M) {
2925 jio_fprintf(defaultStream::error_stream(),
2926 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2927 vm_exit(1);
2928 }
2930 // The heap size is half of available memory, or (at most)
2931 // all of possible memory less 160mb (leaving room for the OS
2932 // when using ISM). This is the maximum; because adaptive sizing
2933 // is turned on below, the actual space used may be smaller.
2935 initHeapSize = MIN2(total_memory / (julong)2,
2936 total_memory - (julong)160*M);
2938 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2940 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2941 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2942 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2943 // Currently the minimum size and the initial heap sizes are the same.
2944 set_min_heap_size(initHeapSize);
2945 }
2946 if (FLAG_IS_DEFAULT(NewSize)) {
2947 // Make the young generation 3/8ths of the total heap.
2948 FLAG_SET_CMDLINE(uintx, NewSize,
2949 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2950 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2951 }
2953 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2954 FLAG_SET_DEFAULT(UseLargePages, true);
2955 #endif
2957 // Increase some data structure sizes for efficiency
2958 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2959 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2960 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2962 // See the OldPLABSize comment below, but replace 'after promotion'
2963 // with 'after copying'. YoungPLABSize is the size of the survivor
2964 // space per-gc-thread buffers. The default is 4kw.
2965 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2967 // OldPLABSize is the size of the buffers in the old gen that
2968 // UseParallelGC uses to promote live data that doesn't fit in the
2969 // survivor spaces. At any given time, there's one for each gc thread.
2970 // The default size is 1kw. These buffers are rarely used, since the
2971 // survivor spaces are usually big enough. For specjbb, however, there
2972 // are occasions when there's lots of live data in the young gen
2973 // and we end up promoting some of it. We don't have a definite
2974 // explanation for why bumping OldPLABSize helps, but the theory
2975 // is that a bigger PLAB results in retaining something like the
2976 // original allocation order after promotion, which improves mutator
2977 // locality. A minor effect may be that larger PLABs reduce the
2978 // number of PLAB allocation events during gc. The value of 8kw
2979 // was arrived at by experimenting with specjbb.
2980 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2982 // Enable parallel GC and adaptive generation sizing
2983 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2984 FLAG_SET_DEFAULT(ParallelGCThreads,
2985 Abstract_VM_Version::parallel_worker_threads());
2987 // Encourage steady state memory management
2988 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2990 // This appears to improve mutator locality
2991 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2993 // Get around early Solaris scheduling bug
2994 // (affinity vs other jobs on system)
2995 // but disallow DR and offlining (5008695).
2996 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2998 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2999 // The last option must always win.
3000 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3001 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3002 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3003 // The last option must always win.
3004 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3005 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3006 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3007 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3008 jio_fprintf(defaultStream::error_stream(),
3009 "Please use CMSClassUnloadingEnabled in place of "
3010 "CMSPermGenSweepingEnabled in the future\n");
3011 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3012 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3013 jio_fprintf(defaultStream::error_stream(),
3014 "Please use -XX:+UseGCOverheadLimit in place of "
3015 "-XX:+UseGCTimeLimit in the future\n");
3016 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3017 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3018 jio_fprintf(defaultStream::error_stream(),
3019 "Please use -XX:-UseGCOverheadLimit in place of "
3020 "-XX:-UseGCTimeLimit in the future\n");
3021 // The TLE options are for compatibility with 1.3 and will be
3022 // removed without notice in a future release. These options
3023 // are not to be documented.
3024 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3025 // No longer used.
3026 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3027 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3028 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3029 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3030 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3031 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3032 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3033 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3034 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3035 // No longer used.
3036 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3037 julong long_tlab_size = 0;
3038 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3039 if (errcode != arg_in_range) {
3040 jio_fprintf(defaultStream::error_stream(),
3041 "Invalid TLAB size: %s\n", option->optionString);
3042 describe_range_error(errcode);
3043 return JNI_EINVAL;
3044 }
3045 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3046 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3047 // No longer used.
3048 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3049 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3050 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3051 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3052 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3053 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3054 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3055 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3056 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3057 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3058 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3059 #if defined(DTRACE_ENABLED)
3060 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3061 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3062 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3063 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3064 #else // defined(DTRACE_ENABLED)
3065 jio_fprintf(defaultStream::error_stream(),
3066 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3067 return JNI_EINVAL;
3068 #endif // defined(DTRACE_ENABLED)
3069 #ifdef ASSERT
3070 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3071 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3072 // disable scavenge before parallel mark-compact
3073 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3074 #endif
3075 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3076 julong cms_blocks_to_claim = (julong)atol(tail);
3077 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3078 jio_fprintf(defaultStream::error_stream(),
3079 "Please use -XX:OldPLABSize in place of "
3080 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3081 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3082 julong cms_blocks_to_claim = (julong)atol(tail);
3083 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3084 jio_fprintf(defaultStream::error_stream(),
3085 "Please use -XX:OldPLABSize in place of "
3086 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3087 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3088 julong old_plab_size = 0;
3089 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3090 if (errcode != arg_in_range) {
3091 jio_fprintf(defaultStream::error_stream(),
3092 "Invalid old PLAB size: %s\n", option->optionString);
3093 describe_range_error(errcode);
3094 return JNI_EINVAL;
3095 }
3096 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3097 jio_fprintf(defaultStream::error_stream(),
3098 "Please use -XX:OldPLABSize in place of "
3099 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3100 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3101 julong young_plab_size = 0;
3102 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3103 if (errcode != arg_in_range) {
3104 jio_fprintf(defaultStream::error_stream(),
3105 "Invalid young PLAB size: %s\n", option->optionString);
3106 describe_range_error(errcode);
3107 return JNI_EINVAL;
3108 }
3109 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3110 jio_fprintf(defaultStream::error_stream(),
3111 "Please use -XX:YoungPLABSize in place of "
3112 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3113 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3114 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3115 julong stack_size = 0;
3116 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3117 if (errcode != arg_in_range) {
3118 jio_fprintf(defaultStream::error_stream(),
3119 "Invalid mark stack size: %s\n", option->optionString);
3120 describe_range_error(errcode);
3121 return JNI_EINVAL;
3122 }
3123 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3124 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3125 julong max_stack_size = 0;
3126 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3127 if (errcode != arg_in_range) {
3128 jio_fprintf(defaultStream::error_stream(),
3129 "Invalid maximum mark stack size: %s\n",
3130 option->optionString);
3131 describe_range_error(errcode);
3132 return JNI_EINVAL;
3133 }
3134 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3135 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3136 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3137 uintx conc_threads = 0;
3138 if (!parse_uintx(tail, &conc_threads, 1)) {
3139 jio_fprintf(defaultStream::error_stream(),
3140 "Invalid concurrent threads: %s\n", option->optionString);
3141 return JNI_EINVAL;
3142 }
3143 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3144 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3145 julong max_direct_memory_size = 0;
3146 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3147 if (errcode != arg_in_range) {
3148 jio_fprintf(defaultStream::error_stream(),
3149 "Invalid maximum direct memory size: %s\n",
3150 option->optionString);
3151 describe_range_error(errcode);
3152 return JNI_EINVAL;
3153 }
3154 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3155 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3156 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3157 // away and will cause VM initialization failures!
3158 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3159 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3160 #if !INCLUDE_MANAGEMENT
3161 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3162 jio_fprintf(defaultStream::error_stream(),
3163 "ManagementServer is not supported in this VM.\n");
3164 return JNI_ERR;
3165 #endif // INCLUDE_MANAGEMENT
3166 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3167 // Skip -XX:Flags= since that case has already been handled
3168 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3169 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3170 return JNI_EINVAL;
3171 }
3172 }
3173 // Unknown option
3174 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3175 return JNI_ERR;
3176 }
3177 }
3179 // Change the default value for flags which have different default values
3180 // when working with older JDKs.
3181 #ifdef LINUX
3182 if (JDK_Version::current().compare_major(6) <= 0 &&
3183 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3184 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3185 }
3186 #endif // LINUX
3187 return JNI_OK;
3188 }
3190 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3191 // This must be done after all -D arguments have been processed.
3192 scp_p->expand_endorsed();
3194 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3195 // Assemble the bootclasspath elements into the final path.
3196 Arguments::set_sysclasspath(scp_p->combined_path());
3197 }
3199 // This must be done after all arguments have been processed.
3200 // java_compiler() true means set to "NONE" or empty.
3201 if (java_compiler() && !xdebug_mode()) {
3202 // For backwards compatibility, we switch to interpreted mode if
3203 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3204 // not specified.
3205 set_mode_flags(_int);
3206 }
3207 if (CompileThreshold == 0) {
3208 set_mode_flags(_int);
3209 }
3211 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3212 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3213 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3214 }
3216 #ifndef COMPILER2
3217 // Don't degrade server performance for footprint
3218 if (FLAG_IS_DEFAULT(UseLargePages) &&
3219 MaxHeapSize < LargePageHeapSizeThreshold) {
3220 // No need for large granularity pages w/small heaps.
3221 // Note that large pages are enabled/disabled for both the
3222 // Java heap and the code cache.
3223 FLAG_SET_DEFAULT(UseLargePages, false);
3224 }
3226 #else
3227 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3228 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3229 }
3230 #endif
3232 #ifndef TIERED
3233 // Tiered compilation is undefined.
3234 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3235 #endif
3237 // If we are running in a headless jre, force java.awt.headless property
3238 // to be true unless the property has already been set.
3239 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3240 if (os::is_headless_jre()) {
3241 const char* headless = Arguments::get_property("java.awt.headless");
3242 if (headless == NULL) {
3243 char envbuffer[128];
3244 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3245 if (!add_property("java.awt.headless=true")) {
3246 return JNI_ENOMEM;
3247 }
3248 } else {
3249 char buffer[256];
3250 strcpy(buffer, "java.awt.headless=");
3251 strcat(buffer, envbuffer);
3252 if (!add_property(buffer)) {
3253 return JNI_ENOMEM;
3254 }
3255 }
3256 }
3257 }
3259 if (!check_vm_args_consistency()) {
3260 return JNI_ERR;
3261 }
3263 return JNI_OK;
3264 }
3266 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3267 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3268 scp_assembly_required_p);
3269 }
3271 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3272 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3273 scp_assembly_required_p);
3274 }
3276 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3277 const int N_MAX_OPTIONS = 64;
3278 const int OPTION_BUFFER_SIZE = 1024;
3279 char buffer[OPTION_BUFFER_SIZE];
3281 // The variable will be ignored if it exceeds the length of the buffer.
3282 // Don't check this variable if user has special privileges
3283 // (e.g. unix su command).
3284 if (os::getenv(name, buffer, sizeof(buffer)) &&
3285 !os::have_special_privileges()) {
3286 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3287 jio_fprintf(defaultStream::error_stream(),
3288 "Picked up %s: %s\n", name, buffer);
3289 char* rd = buffer; // pointer to the input string (rd)
3290 int i;
3291 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3292 while (isspace(*rd)) rd++; // skip whitespace
3293 if (*rd == 0) break; // we re done when the input string is read completely
3295 // The output, option string, overwrites the input string.
3296 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3297 // input string (rd).
3298 char* wrt = rd;
3300 options[i++].optionString = wrt; // Fill in option
3301 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3302 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3303 int quote = *rd; // matching quote to look for
3304 rd++; // don't copy open quote
3305 while (*rd != quote) { // include everything (even spaces) up until quote
3306 if (*rd == 0) { // string termination means unmatched string
3307 jio_fprintf(defaultStream::error_stream(),
3308 "Unmatched quote in %s\n", name);
3309 return JNI_ERR;
3310 }
3311 *wrt++ = *rd++; // copy to option string
3312 }
3313 rd++; // don't copy close quote
3314 } else {
3315 *wrt++ = *rd++; // copy to option string
3316 }
3317 }
3318 // Need to check if we're done before writing a NULL,
3319 // because the write could be to the byte that rd is pointing to.
3320 if (*rd++ == 0) {
3321 *wrt = 0;
3322 break;
3323 }
3324 *wrt = 0; // Zero terminate option
3325 }
3326 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3327 JavaVMInitArgs vm_args;
3328 vm_args.version = JNI_VERSION_1_2;
3329 vm_args.options = options;
3330 vm_args.nOptions = i;
3331 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3333 if (PrintVMOptions) {
3334 const char* tail;
3335 for (int i = 0; i < vm_args.nOptions; i++) {
3336 const JavaVMOption *option = vm_args.options + i;
3337 if (match_option(option, "-XX:", &tail)) {
3338 logOption(tail);
3339 }
3340 }
3341 }
3343 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3344 }
3345 return JNI_OK;
3346 }
3348 void Arguments::set_shared_spaces_flags() {
3349 if (DumpSharedSpaces) {
3350 if (RequireSharedSpaces) {
3351 warning("cannot dump shared archive while using shared archive");
3352 }
3353 UseSharedSpaces = false;
3354 #ifdef _LP64
3355 if (!UseCompressedOops || !UseCompressedClassPointers) {
3356 vm_exit_during_initialization(
3357 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3358 }
3359 } else {
3360 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.
3361 if (!UseCompressedOops || !UseCompressedClassPointers) {
3362 no_shared_spaces();
3363 }
3364 #endif
3365 }
3366 }
3368 #if !INCLUDE_ALL_GCS
3369 static void force_serial_gc() {
3370 FLAG_SET_DEFAULT(UseSerialGC, true);
3371 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3372 UNSUPPORTED_GC_OPTION(UseG1GC);
3373 UNSUPPORTED_GC_OPTION(UseParallelGC);
3374 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3375 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3376 UNSUPPORTED_GC_OPTION(UseParNewGC);
3377 }
3378 #endif // INCLUDE_ALL_GCS
3380 // Sharing support
3381 // Construct the path to the archive
3382 static char* get_shared_archive_path() {
3383 char *shared_archive_path;
3384 if (SharedArchiveFile == NULL) {
3385 char jvm_path[JVM_MAXPATHLEN];
3386 os::jvm_path(jvm_path, sizeof(jvm_path));
3387 char *end = strrchr(jvm_path, *os::file_separator());
3388 if (end != NULL) *end = '\0';
3389 size_t jvm_path_len = strlen(jvm_path);
3390 size_t file_sep_len = strlen(os::file_separator());
3391 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3392 file_sep_len + 20, mtInternal);
3393 if (shared_archive_path != NULL) {
3394 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3395 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3396 strncat(shared_archive_path, "classes.jsa", 11);
3397 }
3398 } else {
3399 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3400 if (shared_archive_path != NULL) {
3401 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3402 }
3403 }
3404 return shared_archive_path;
3405 }
3407 #ifndef PRODUCT
3408 // Determine whether LogVMOutput should be implicitly turned on.
3409 static bool use_vm_log() {
3410 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3411 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3412 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3413 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3414 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3415 return true;
3416 }
3418 #ifdef COMPILER1
3419 if (PrintC1Statistics) {
3420 return true;
3421 }
3422 #endif // COMPILER1
3424 #ifdef COMPILER2
3425 if (PrintOptoAssembly || PrintOptoStatistics) {
3426 return true;
3427 }
3428 #endif // COMPILER2
3430 return false;
3431 }
3432 #endif // PRODUCT
3434 // Parse entry point called from JNI_CreateJavaVM
3436 jint Arguments::parse(const JavaVMInitArgs* args) {
3438 // Remaining part of option string
3439 const char* tail;
3441 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3442 const char* hotspotrc = ".hotspotrc";
3443 bool settings_file_specified = false;
3444 bool needs_hotspotrc_warning = false;
3446 const char* flags_file;
3447 int index;
3448 for (index = 0; index < args->nOptions; index++) {
3449 const JavaVMOption *option = args->options + index;
3450 if (match_option(option, "-XX:Flags=", &tail)) {
3451 flags_file = tail;
3452 settings_file_specified = true;
3453 }
3454 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3455 PrintVMOptions = true;
3456 }
3457 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3458 PrintVMOptions = false;
3459 }
3460 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3461 IgnoreUnrecognizedVMOptions = true;
3462 }
3463 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3464 IgnoreUnrecognizedVMOptions = false;
3465 }
3466 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3467 CommandLineFlags::printFlags(tty, false);
3468 vm_exit(0);
3469 }
3470 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3471 #if INCLUDE_NMT
3472 MemTracker::init_tracking_options(tail);
3473 #else
3474 jio_fprintf(defaultStream::error_stream(),
3475 "Native Memory Tracking is not supported in this VM\n");
3476 return JNI_ERR;
3477 #endif
3478 }
3481 #ifndef PRODUCT
3482 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3483 CommandLineFlags::printFlags(tty, true);
3484 vm_exit(0);
3485 }
3486 #endif
3487 }
3489 if (IgnoreUnrecognizedVMOptions) {
3490 // uncast const to modify the flag args->ignoreUnrecognized
3491 *(jboolean*)(&args->ignoreUnrecognized) = true;
3492 }
3494 // Parse specified settings file
3495 if (settings_file_specified) {
3496 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3497 return JNI_EINVAL;
3498 }
3499 } else {
3500 #ifdef ASSERT
3501 // Parse default .hotspotrc settings file
3502 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3503 return JNI_EINVAL;
3504 }
3505 #else
3506 struct stat buf;
3507 if (os::stat(hotspotrc, &buf) == 0) {
3508 needs_hotspotrc_warning = true;
3509 }
3510 #endif
3511 }
3513 if (PrintVMOptions) {
3514 for (index = 0; index < args->nOptions; index++) {
3515 const JavaVMOption *option = args->options + index;
3516 if (match_option(option, "-XX:", &tail)) {
3517 logOption(tail);
3518 }
3519 }
3520 }
3522 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3523 jint result = parse_vm_init_args(args);
3524 if (result != JNI_OK) {
3525 return result;
3526 }
3528 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3529 SharedArchivePath = get_shared_archive_path();
3530 if (SharedArchivePath == NULL) {
3531 return JNI_ENOMEM;
3532 }
3534 // Delay warning until here so that we've had a chance to process
3535 // the -XX:-PrintWarnings flag
3536 if (needs_hotspotrc_warning) {
3537 warning("%s file is present but has been ignored. "
3538 "Run with -XX:Flags=%s to load the file.",
3539 hotspotrc, hotspotrc);
3540 }
3542 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3543 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3544 #endif
3546 #if INCLUDE_ALL_GCS
3547 #if (defined JAVASE_EMBEDDED || defined ARM)
3548 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3549 #endif
3550 #endif
3552 #ifndef PRODUCT
3553 if (TraceBytecodesAt != 0) {
3554 TraceBytecodes = true;
3555 }
3556 if (CountCompiledCalls) {
3557 if (UseCounterDecay) {
3558 warning("UseCounterDecay disabled because CountCalls is set");
3559 UseCounterDecay = false;
3560 }
3561 }
3562 #endif // PRODUCT
3564 // JSR 292 is not supported before 1.7
3565 if (!JDK_Version::is_gte_jdk17x_version()) {
3566 if (EnableInvokeDynamic) {
3567 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3568 warning("JSR 292 is not supported before 1.7. Disabling support.");
3569 }
3570 EnableInvokeDynamic = false;
3571 }
3572 }
3574 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3575 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3576 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3577 }
3578 ScavengeRootsInCode = 1;
3579 }
3581 if (PrintGCDetails) {
3582 // Turn on -verbose:gc options as well
3583 PrintGC = true;
3584 }
3586 if (!JDK_Version::is_gte_jdk18x_version()) {
3587 // To avoid changing the log format for 7 updates this flag is only
3588 // true by default in JDK8 and above.
3589 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3590 FLAG_SET_DEFAULT(PrintGCCause, false);
3591 }
3592 }
3594 // Set object alignment values.
3595 set_object_alignment();
3597 #if !INCLUDE_ALL_GCS
3598 force_serial_gc();
3599 #endif // INCLUDE_ALL_GCS
3600 #if !INCLUDE_CDS
3601 if (DumpSharedSpaces || RequireSharedSpaces) {
3602 jio_fprintf(defaultStream::error_stream(),
3603 "Shared spaces are not supported in this VM\n");
3604 return JNI_ERR;
3605 }
3606 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3607 warning("Shared spaces are not supported in this VM");
3608 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3609 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3610 }
3611 no_shared_spaces();
3612 #endif // INCLUDE_CDS
3614 return JNI_OK;
3615 }
3617 jint Arguments::apply_ergo() {
3619 // Set flags based on ergonomics.
3620 set_ergonomics_flags();
3622 set_shared_spaces_flags();
3624 // Check the GC selections again.
3625 if (!check_gc_consistency()) {
3626 return JNI_EINVAL;
3627 }
3629 if (TieredCompilation) {
3630 set_tiered_flags();
3631 } else {
3632 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3633 if (CompilationPolicyChoice >= 2) {
3634 vm_exit_during_initialization(
3635 "Incompatible compilation policy selected", NULL);
3636 }
3637 }
3638 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
3639 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3640 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
3641 }
3644 // Set heap size based on available physical memory
3645 set_heap_size();
3647 #if INCLUDE_ALL_GCS
3648 // Set per-collector flags
3649 if (UseParallelGC || UseParallelOldGC) {
3650 set_parallel_gc_flags();
3651 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3652 set_cms_and_parnew_gc_flags();
3653 } else if (UseParNewGC) { // skipped if CMS is set above
3654 set_parnew_gc_flags();
3655 } else if (UseG1GC) {
3656 set_g1_gc_flags();
3657 }
3658 check_deprecated_gcs();
3659 check_deprecated_gc_flags();
3660 if (AssumeMP && !UseSerialGC) {
3661 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3662 warning("If the number of processors is expected to increase from one, then"
3663 " you should configure the number of parallel GC threads appropriately"
3664 " using -XX:ParallelGCThreads=N");
3665 }
3666 }
3667 #else // INCLUDE_ALL_GCS
3668 assert(verify_serial_gc_flags(), "SerialGC unset");
3669 #endif // INCLUDE_ALL_GCS
3671 // Initialize Metaspace flags and alignments.
3672 Metaspace::ergo_initialize();
3674 // Set bytecode rewriting flags
3675 set_bytecode_flags();
3677 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3678 set_aggressive_opts_flags();
3680 // Turn off biased locking for locking debug mode flags,
3681 // which are subtlely different from each other but neither works with
3682 // biased locking.
3683 if (UseHeavyMonitors
3684 #ifdef COMPILER1
3685 || !UseFastLocking
3686 #endif // COMPILER1
3687 ) {
3688 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3689 // flag set to true on command line; warn the user that they
3690 // can't enable biased locking here
3691 warning("Biased Locking is not supported with locking debug flags"
3692 "; ignoring UseBiasedLocking flag." );
3693 }
3694 UseBiasedLocking = false;
3695 }
3697 #ifdef CC_INTERP
3698 // Clear flags not supported by the C++ interpreter
3699 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3700 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3701 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3702 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3703 #endif // CC_INTERP
3705 #ifdef COMPILER2
3706 if (!UseBiasedLocking || EmitSync != 0) {
3707 UseOptoBiasInlining = false;
3708 }
3709 if (!EliminateLocks) {
3710 EliminateNestedLocks = false;
3711 }
3712 if (!Inline) {
3713 IncrementalInline = false;
3714 }
3715 #ifndef PRODUCT
3716 if (!IncrementalInline) {
3717 AlwaysIncrementalInline = false;
3718 }
3719 #endif
3720 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3721 // incremental inlining: bump MaxNodeLimit
3722 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3723 }
3724 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3725 // nothing to use the profiling, turn if off
3726 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3727 }
3728 if (UseTypeSpeculation && FLAG_IS_DEFAULT(ReplaceInParentMaps)) {
3729 // Doing the replace in parent maps helps speculation
3730 FLAG_SET_DEFAULT(ReplaceInParentMaps, true);
3731 }
3732 #ifndef X86
3733 // Only on x86 for now
3734 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3735 #endif
3736 #endif
3738 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3739 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3740 DebugNonSafepoints = true;
3741 }
3743 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3744 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3745 }
3747 #ifndef PRODUCT
3748 if (CompileTheWorld) {
3749 // Force NmethodSweeper to sweep whole CodeCache each time.
3750 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3751 NmethodSweepFraction = 1;
3752 }
3753 }
3755 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3756 if (use_vm_log()) {
3757 LogVMOutput = true;
3758 }
3759 }
3760 #endif // PRODUCT
3762 if (PrintCommandLineFlags) {
3763 CommandLineFlags::printSetFlags(tty);
3764 }
3766 // Apply CPU specific policy for the BiasedLocking
3767 if (UseBiasedLocking) {
3768 if (!VM_Version::use_biased_locking() &&
3769 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3770 UseBiasedLocking = false;
3771 }
3772 }
3774 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3775 // but only if not already set on the commandline
3776 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3777 bool set = false;
3778 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3779 if (!set) {
3780 FLAG_SET_DEFAULT(PauseAtExit, true);
3781 }
3782 }
3784 return JNI_OK;
3785 }
3787 jint Arguments::adjust_after_os() {
3788 #if INCLUDE_ALL_GCS
3789 if (UseParallelGC || UseParallelOldGC) {
3790 if (UseNUMA) {
3791 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3792 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3793 }
3794 // For those collectors or operating systems (eg, Windows) that do
3795 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3796 UseNUMAInterleaving = true;
3797 }
3798 }
3799 #endif // INCLUDE_ALL_GCS
3800 return JNI_OK;
3801 }
3803 int Arguments::PropertyList_count(SystemProperty* pl) {
3804 int count = 0;
3805 while(pl != NULL) {
3806 count++;
3807 pl = pl->next();
3808 }
3809 return count;
3810 }
3812 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3813 assert(key != NULL, "just checking");
3814 SystemProperty* prop;
3815 for (prop = pl; prop != NULL; prop = prop->next()) {
3816 if (strcmp(key, prop->key()) == 0) return prop->value();
3817 }
3818 return NULL;
3819 }
3821 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3822 int count = 0;
3823 const char* ret_val = NULL;
3825 while(pl != NULL) {
3826 if(count >= index) {
3827 ret_val = pl->key();
3828 break;
3829 }
3830 count++;
3831 pl = pl->next();
3832 }
3834 return ret_val;
3835 }
3837 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3838 int count = 0;
3839 char* ret_val = NULL;
3841 while(pl != NULL) {
3842 if(count >= index) {
3843 ret_val = pl->value();
3844 break;
3845 }
3846 count++;
3847 pl = pl->next();
3848 }
3850 return ret_val;
3851 }
3853 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3854 SystemProperty* p = *plist;
3855 if (p == NULL) {
3856 *plist = new_p;
3857 } else {
3858 while (p->next() != NULL) {
3859 p = p->next();
3860 }
3861 p->set_next(new_p);
3862 }
3863 }
3865 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3866 if (plist == NULL)
3867 return;
3869 SystemProperty* new_p = new SystemProperty(k, v, true);
3870 PropertyList_add(plist, new_p);
3871 }
3873 // This add maintains unique property key in the list.
3874 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3875 if (plist == NULL)
3876 return;
3878 // If property key exist then update with new value.
3879 SystemProperty* prop;
3880 for (prop = *plist; prop != NULL; prop = prop->next()) {
3881 if (strcmp(k, prop->key()) == 0) {
3882 if (append) {
3883 prop->append_value(v);
3884 } else {
3885 prop->set_value(v);
3886 }
3887 return;
3888 }
3889 }
3891 PropertyList_add(plist, k, v);
3892 }
3894 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3895 // Returns true if all of the source pointed by src has been copied over to
3896 // the destination buffer pointed by buf. Otherwise, returns false.
3897 // Notes:
3898 // 1. If the length (buflen) of the destination buffer excluding the
3899 // NULL terminator character is not long enough for holding the expanded
3900 // pid characters, it also returns false instead of returning the partially
3901 // expanded one.
3902 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3903 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3904 char* buf, size_t buflen) {
3905 const char* p = src;
3906 char* b = buf;
3907 const char* src_end = &src[srclen];
3908 char* buf_end = &buf[buflen - 1];
3910 while (p < src_end && b < buf_end) {
3911 if (*p == '%') {
3912 switch (*(++p)) {
3913 case '%': // "%%" ==> "%"
3914 *b++ = *p++;
3915 break;
3916 case 'p': { // "%p" ==> current process id
3917 // buf_end points to the character before the last character so
3918 // that we could write '\0' to the end of the buffer.
3919 size_t buf_sz = buf_end - b + 1;
3920 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3922 // if jio_snprintf fails or the buffer is not long enough to hold
3923 // the expanded pid, returns false.
3924 if (ret < 0 || ret >= (int)buf_sz) {
3925 return false;
3926 } else {
3927 b += ret;
3928 assert(*b == '\0', "fail in copy_expand_pid");
3929 if (p == src_end && b == buf_end + 1) {
3930 // reach the end of the buffer.
3931 return true;
3932 }
3933 }
3934 p++;
3935 break;
3936 }
3937 default :
3938 *b++ = '%';
3939 }
3940 } else {
3941 *b++ = *p++;
3942 }
3943 }
3944 *b = '\0';
3945 return (p == src_end); // return false if not all of the source was copied
3946 }