1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaAssertions.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "compiler/compilerOracle.hpp"
29 #include "memory/allocation.inline.hpp"
30 #include "memory/cardTableRS.hpp"
31 #include "memory/genCollectedHeap.hpp"
32 #include "memory/referenceProcessor.hpp"
33 #include "memory/universe.inline.hpp"
34 #include "oops/oop.inline.hpp"
35 #include "prims/jvmtiExport.hpp"
36 #include "runtime/arguments.hpp"
37 #include "runtime/globals_extension.hpp"
38 #include "runtime/java.hpp"
39 #include "services/management.hpp"
40 #include "services/memTracker.hpp"
41 #include "utilities/defaultStream.hpp"
42 #include "utilities/macros.hpp"
43 #include "utilities/taskqueue.hpp"
44 #ifdef TARGET_OS_FAMILY_linux
45 # include "os_linux.inline.hpp"
46 #endif
47 #ifdef TARGET_OS_FAMILY_solaris
48 # include "os_solaris.inline.hpp"
49 #endif
50 #ifdef TARGET_OS_FAMILY_windows
51 # include "os_windows.inline.hpp"
52 #endif
53 #ifdef TARGET_OS_FAMILY_aix
54 # include "os_aix.inline.hpp"
55 #endif
56 #ifdef TARGET_OS_FAMILY_bsd
57 # include "os_bsd.inline.hpp"
58 #endif
59 #if INCLUDE_ALL_GCS
60 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
61 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
62 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
63 #endif // INCLUDE_ALL_GCS
64
65 // Note: This is a special bug reporting site for the JVM
66 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
67 #define DEFAULT_JAVA_LAUNCHER "generic"
68
69 // Disable options not supported in this release, with a warning if they
70 // were explicitly requested on the command-line
71 #define UNSUPPORTED_OPTION(opt, description) \
72 do { \
73 if (opt) { \
74 if (FLAG_IS_CMDLINE(opt)) { \
75 warning(description " is disabled in this release."); \
76 } \
77 FLAG_SET_DEFAULT(opt, false); \
78 } \
79 } while(0)
80
81 #define UNSUPPORTED_GC_OPTION(gc) \
82 do { \
83 if (gc) { \
84 if (FLAG_IS_CMDLINE(gc)) { \
85 warning(#gc " is not supported in this VM. Using Serial GC."); \
86 } \
87 FLAG_SET_DEFAULT(gc, false); \
88 } \
89 } while(0)
90
91 char** Arguments::_jvm_flags_array = NULL;
92 int Arguments::_num_jvm_flags = 0;
93 char** Arguments::_jvm_args_array = NULL;
94 int Arguments::_num_jvm_args = 0;
95 char* Arguments::_java_command = NULL;
96 SystemProperty* Arguments::_system_properties = NULL;
97 const char* Arguments::_gc_log_filename = NULL;
98 bool Arguments::_has_profile = false;
99 size_t Arguments::_conservative_max_heap_alignment = 0;
100 uintx Arguments::_min_heap_size = 0;
101 Arguments::Mode Arguments::_mode = _mixed;
102 bool Arguments::_java_compiler = false;
103 bool Arguments::_xdebug_mode = false;
104 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
105 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
106 int Arguments::_sun_java_launcher_pid = -1;
107 bool Arguments::_created_by_gamma_launcher = false;
108
109 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
110 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
111 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
112 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
113 bool Arguments::_ClipInlining = ClipInlining;
114
115 char* Arguments::SharedArchivePath = NULL;
116
117 AgentLibraryList Arguments::_libraryList;
118 AgentLibraryList Arguments::_agentList;
119
120 abort_hook_t Arguments::_abort_hook = NULL;
121 exit_hook_t Arguments::_exit_hook = NULL;
122 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
123
124
125 SystemProperty *Arguments::_java_ext_dirs = NULL;
126 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
127 SystemProperty *Arguments::_sun_boot_library_path = NULL;
128 SystemProperty *Arguments::_java_library_path = NULL;
129 SystemProperty *Arguments::_java_home = NULL;
130 SystemProperty *Arguments::_java_class_path = NULL;
131 SystemProperty *Arguments::_sun_boot_class_path = NULL;
132
133 char* Arguments::_meta_index_path = NULL;
134 char* Arguments::_meta_index_dir = NULL;
135
136 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
137
138 static bool match_option(const JavaVMOption *option, const char* name,
139 const char** tail) {
140 int len = (int)strlen(name);
141 if (strncmp(option->optionString, name, len) == 0) {
142 *tail = option->optionString + len;
143 return true;
144 } else {
145 return false;
146 }
147 }
148
149 static void logOption(const char* opt) {
150 if (PrintVMOptions) {
151 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
152 }
153 }
154
155 // Process java launcher properties.
156 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
157 // See if sun.java.launcher or sun.java.launcher.pid is defined.
158 // Must do this before setting up other system properties,
159 // as some of them may depend on launcher type.
160 for (int index = 0; index < args->nOptions; index++) {
161 const JavaVMOption* option = args->options + index;
162 const char* tail;
163
164 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
165 process_java_launcher_argument(tail, option->extraInfo);
166 continue;
167 }
168 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
169 _sun_java_launcher_pid = atoi(tail);
170 continue;
171 }
172 }
173 }
174
175 // Initialize system properties key and value.
176 void Arguments::init_system_properties() {
177
178 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
179 "Java Virtual Machine Specification", false));
180 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
181 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
182 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
183
184 // following are JVMTI agent writeable properties.
185 // Properties values are set to NULL and they are
186 // os specific they are initialized in os::init_system_properties_values().
187 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
188 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
189 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
190 _java_library_path = new SystemProperty("java.library.path", NULL, true);
191 _java_home = new SystemProperty("java.home", NULL, true);
192 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
193
194 _java_class_path = new SystemProperty("java.class.path", "", true);
195
196 // Add to System Property list.
197 PropertyList_add(&_system_properties, _java_ext_dirs);
198 PropertyList_add(&_system_properties, _java_endorsed_dirs);
199 PropertyList_add(&_system_properties, _sun_boot_library_path);
200 PropertyList_add(&_system_properties, _java_library_path);
201 PropertyList_add(&_system_properties, _java_home);
202 PropertyList_add(&_system_properties, _java_class_path);
203 PropertyList_add(&_system_properties, _sun_boot_class_path);
204
205 // Set OS specific system properties values
206 os::init_system_properties_values();
207 }
208
209
210 // Update/Initialize System properties after JDK version number is known
211 void Arguments::init_version_specific_system_properties() {
212 enum { bufsz = 16 };
213 char buffer[bufsz];
214 const char* spec_vendor = "Sun Microsystems Inc.";
215 uint32_t spec_version = 0;
216
217 if (JDK_Version::is_gte_jdk17x_version()) {
218 spec_vendor = "Oracle Corporation";
219 spec_version = JDK_Version::current().major_version();
220 }
221 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
222
223 PropertyList_add(&_system_properties,
224 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
225 PropertyList_add(&_system_properties,
226 new SystemProperty("java.vm.specification.version", buffer, false));
227 PropertyList_add(&_system_properties,
228 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
229 }
230
231 /**
232 * Provide a slightly more user-friendly way of eliminating -XX flags.
233 * When a flag is eliminated, it can be added to this list in order to
234 * continue accepting this flag on the command-line, while issuing a warning
235 * and ignoring the value. Once the JDK version reaches the 'accept_until'
236 * limit, we flatly refuse to admit the existence of the flag. This allows
237 * a flag to die correctly over JDK releases using HSX.
238 */
239 typedef struct {
240 const char* name;
241 JDK_Version obsoleted_in; // when the flag went away
242 JDK_Version accept_until; // which version to start denying the existence
243 } ObsoleteFlag;
244
245 static ObsoleteFlag obsolete_jvm_flags[] = {
246 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
247 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
248 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
249 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
250 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
251 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
252 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
253 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
254 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
255 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
256 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
257 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
258 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
259 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
260 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
261 { "DefaultInitialRAMFraction",
262 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
263 { "UseDepthFirstScavengeOrder",
264 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
265 { "HandlePromotionFailure",
266 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
267 { "MaxLiveObjectEvacuationRatio",
268 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
269 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
270 { "UseParallelOldGCCompacting",
271 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
272 { "UseParallelDensePrefixUpdate",
273 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
274 { "UseParallelOldGCDensePrefix",
275 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
276 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
277 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
278 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
279 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
280 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
281 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
282 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
283 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
284 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
285 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
286 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
293 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
294 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
295 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
296 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
297 #ifdef PRODUCT
298 { "DesiredMethodLimit",
299 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
300 #endif // PRODUCT
301 { NULL, JDK_Version(0), JDK_Version(0) }
302 };
303
304 // Returns true if the flag is obsolete and fits into the range specified
305 // for being ignored. In the case that the flag is ignored, the 'version'
306 // value is filled in with the version number when the flag became
307 // obsolete so that that value can be displayed to the user.
308 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
309 int i = 0;
310 assert(version != NULL, "Must provide a version buffer");
311 while (obsolete_jvm_flags[i].name != NULL) {
312 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
313 // <flag>=xxx form
314 // [-|+]<flag> form
315 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
316 ((s[0] == '+' || s[0] == '-') &&
317 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
318 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
319 *version = flag_status.obsoleted_in;
320 return true;
321 }
322 }
323 i++;
324 }
325 return false;
326 }
327
328 // Constructs the system class path (aka boot class path) from the following
329 // components, in order:
330 //
331 // prefix // from -Xbootclasspath/p:...
332 // endorsed // the expansion of -Djava.endorsed.dirs=...
333 // base // from os::get_system_properties() or -Xbootclasspath=
334 // suffix // from -Xbootclasspath/a:...
335 //
336 // java.endorsed.dirs is a list of directories; any jar or zip files in the
337 // directories are added to the sysclasspath just before the base.
338 //
339 // This could be AllStatic, but it isn't needed after argument processing is
340 // complete.
341 class SysClassPath: public StackObj {
342 public:
343 SysClassPath(const char* base);
344 ~SysClassPath();
345
346 inline void set_base(const char* base);
347 inline void add_prefix(const char* prefix);
348 inline void add_suffix_to_prefix(const char* suffix);
349 inline void add_suffix(const char* suffix);
350 inline void reset_path(const char* base);
351
352 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
353 // property. Must be called after all command-line arguments have been
354 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
355 // combined_path().
356 void expand_endorsed();
357
358 inline const char* get_base() const { return _items[_scp_base]; }
359 inline const char* get_prefix() const { return _items[_scp_prefix]; }
360 inline const char* get_suffix() const { return _items[_scp_suffix]; }
361 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
362
363 // Combine all the components into a single c-heap-allocated string; caller
364 // must free the string if/when no longer needed.
365 char* combined_path();
366
367 private:
368 // Utility routines.
369 static char* add_to_path(const char* path, const char* str, bool prepend);
370 static char* add_jars_to_path(char* path, const char* directory);
371
372 inline void reset_item_at(int index);
373
374 // Array indices for the items that make up the sysclasspath. All except the
375 // base are allocated in the C heap and freed by this class.
376 enum {
377 _scp_prefix, // from -Xbootclasspath/p:...
378 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
379 _scp_base, // the default sysclasspath
380 _scp_suffix, // from -Xbootclasspath/a:...
381 _scp_nitems // the number of items, must be last.
382 };
383
384 const char* _items[_scp_nitems];
385 DEBUG_ONLY(bool _expansion_done;)
386 };
387
388 SysClassPath::SysClassPath(const char* base) {
389 memset(_items, 0, sizeof(_items));
390 _items[_scp_base] = base;
391 DEBUG_ONLY(_expansion_done = false;)
392 }
393
394 SysClassPath::~SysClassPath() {
395 // Free everything except the base.
396 for (int i = 0; i < _scp_nitems; ++i) {
397 if (i != _scp_base) reset_item_at(i);
398 }
399 DEBUG_ONLY(_expansion_done = false;)
400 }
401
402 inline void SysClassPath::set_base(const char* base) {
403 _items[_scp_base] = base;
404 }
405
406 inline void SysClassPath::add_prefix(const char* prefix) {
407 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
408 }
409
410 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
411 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
412 }
413
414 inline void SysClassPath::add_suffix(const char* suffix) {
415 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
416 }
417
418 inline void SysClassPath::reset_item_at(int index) {
419 assert(index < _scp_nitems && index != _scp_base, "just checking");
420 if (_items[index] != NULL) {
421 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
422 _items[index] = NULL;
423 }
424 }
425
426 inline void SysClassPath::reset_path(const char* base) {
427 // Clear the prefix and suffix.
428 reset_item_at(_scp_prefix);
429 reset_item_at(_scp_suffix);
430 set_base(base);
431 }
432
433 //------------------------------------------------------------------------------
434
435 void SysClassPath::expand_endorsed() {
436 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
437
438 const char* path = Arguments::get_property("java.endorsed.dirs");
439 if (path == NULL) {
440 path = Arguments::get_endorsed_dir();
441 assert(path != NULL, "no default for java.endorsed.dirs");
442 }
443
444 char* expanded_path = NULL;
445 const char separator = *os::path_separator();
446 const char* const end = path + strlen(path);
447 while (path < end) {
448 const char* tmp_end = strchr(path, separator);
449 if (tmp_end == NULL) {
450 expanded_path = add_jars_to_path(expanded_path, path);
451 path = end;
452 } else {
453 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
454 memcpy(dirpath, path, tmp_end - path);
455 dirpath[tmp_end - path] = '\0';
456 expanded_path = add_jars_to_path(expanded_path, dirpath);
457 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
458 path = tmp_end + 1;
459 }
460 }
461 _items[_scp_endorsed] = expanded_path;
462 DEBUG_ONLY(_expansion_done = true;)
463 }
464
465 // Combine the bootclasspath elements, some of which may be null, into a single
466 // c-heap-allocated string.
467 char* SysClassPath::combined_path() {
468 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
469 assert(_expansion_done, "must call expand_endorsed() first.");
470
471 size_t lengths[_scp_nitems];
472 size_t total_len = 0;
473
474 const char separator = *os::path_separator();
475
476 // Get the lengths.
477 int i;
478 for (i = 0; i < _scp_nitems; ++i) {
479 if (_items[i] != NULL) {
480 lengths[i] = strlen(_items[i]);
481 // Include space for the separator char (or a NULL for the last item).
482 total_len += lengths[i] + 1;
483 }
484 }
485 assert(total_len > 0, "empty sysclasspath not allowed");
486
487 // Copy the _items to a single string.
488 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
489 char* cp_tmp = cp;
490 for (i = 0; i < _scp_nitems; ++i) {
491 if (_items[i] != NULL) {
492 memcpy(cp_tmp, _items[i], lengths[i]);
493 cp_tmp += lengths[i];
494 *cp_tmp++ = separator;
495 }
496 }
497 *--cp_tmp = '\0'; // Replace the extra separator.
498 return cp;
499 }
500
501 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
502 char*
503 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
504 char *cp;
505
506 assert(str != NULL, "just checking");
507 if (path == NULL) {
508 size_t len = strlen(str) + 1;
509 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
510 memcpy(cp, str, len); // copy the trailing null
511 } else {
512 const char separator = *os::path_separator();
513 size_t old_len = strlen(path);
514 size_t str_len = strlen(str);
515 size_t len = old_len + str_len + 2;
516
517 if (prepend) {
518 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
519 char* cp_tmp = cp;
520 memcpy(cp_tmp, str, str_len);
521 cp_tmp += str_len;
522 *cp_tmp = separator;
523 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
524 FREE_C_HEAP_ARRAY(char, path, mtInternal);
525 } else {
526 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
527 char* cp_tmp = cp + old_len;
528 *cp_tmp = separator;
529 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
530 }
531 }
532 return cp;
533 }
534
535 // Scan the directory and append any jar or zip files found to path.
536 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
537 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
538 DIR* dir = os::opendir(directory);
539 if (dir == NULL) return path;
540
541 char dir_sep[2] = { '\0', '\0' };
542 size_t directory_len = strlen(directory);
543 const char fileSep = *os::file_separator();
544 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
545
546 /* Scan the directory for jars/zips, appending them to path. */
547 struct dirent *entry;
548 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
549 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
550 const char* name = entry->d_name;
551 const char* ext = name + strlen(name) - 4;
552 bool isJarOrZip = ext > name &&
553 (os::file_name_strcmp(ext, ".jar") == 0 ||
554 os::file_name_strcmp(ext, ".zip") == 0);
555 if (isJarOrZip) {
556 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
557 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
558 path = add_to_path(path, jarpath, false);
559 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
560 }
561 }
562 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
563 os::closedir(dir);
564 return path;
565 }
566
567 // Parses a memory size specification string.
568 static bool atomull(const char *s, julong* result) {
569 julong n = 0;
570 int args_read = sscanf(s, JULONG_FORMAT, &n);
571 if (args_read != 1) {
572 return false;
573 }
574 while (*s != '\0' && isdigit(*s)) {
575 s++;
576 }
577 // 4705540: illegal if more characters are found after the first non-digit
578 if (strlen(s) > 1) {
579 return false;
580 }
581 switch (*s) {
582 case 'T': case 't':
583 *result = n * G * K;
584 // Check for overflow.
585 if (*result/((julong)G * K) != n) return false;
586 return true;
587 case 'G': case 'g':
588 *result = n * G;
589 if (*result/G != n) return false;
590 return true;
591 case 'M': case 'm':
592 *result = n * M;
593 if (*result/M != n) return false;
594 return true;
595 case 'K': case 'k':
596 *result = n * K;
597 if (*result/K != n) return false;
598 return true;
599 case '\0':
600 *result = n;
601 return true;
602 default:
603 return false;
604 }
605 }
606
607 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
608 if (size < min_size) return arg_too_small;
609 // Check that size will fit in a size_t (only relevant on 32-bit)
610 if (size > max_uintx) return arg_too_big;
611 return arg_in_range;
612 }
613
614 // Describe an argument out of range error
615 void Arguments::describe_range_error(ArgsRange errcode) {
616 switch(errcode) {
617 case arg_too_big:
618 jio_fprintf(defaultStream::error_stream(),
619 "The specified size exceeds the maximum "
620 "representable size.\n");
621 break;
622 case arg_too_small:
623 case arg_unreadable:
624 case arg_in_range:
625 // do nothing for now
626 break;
627 default:
628 ShouldNotReachHere();
629 }
630 }
631
632 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
633 return CommandLineFlags::boolAtPut(name, &value, origin);
634 }
635
636 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
637 double v;
638 if (sscanf(value, "%lf", &v) != 1) {
639 return false;
640 }
641
642 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
643 return true;
644 }
645 return false;
646 }
647
648 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
649 julong v;
650 intx intx_v;
651 bool is_neg = false;
652 // Check the sign first since atomull() parses only unsigned values.
653 if (*value == '-') {
654 if (!CommandLineFlags::intxAt(name, &intx_v)) {
655 return false;
656 }
657 value++;
658 is_neg = true;
659 }
660 if (!atomull(value, &v)) {
661 return false;
662 }
663 intx_v = (intx) v;
664 if (is_neg) {
665 intx_v = -intx_v;
666 }
667 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
668 return true;
669 }
670 uintx uintx_v = (uintx) v;
671 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
672 return true;
673 }
674 uint64_t uint64_t_v = (uint64_t) v;
675 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
676 return true;
677 }
678 return false;
679 }
680
681 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
682 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
683 // Contract: CommandLineFlags always returns a pointer that needs freeing.
684 FREE_C_HEAP_ARRAY(char, value, mtInternal);
685 return true;
686 }
687
688 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
689 const char* old_value = "";
690 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
691 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
692 size_t new_len = strlen(new_value);
693 const char* value;
694 char* free_this_too = NULL;
695 if (old_len == 0) {
696 value = new_value;
697 } else if (new_len == 0) {
698 value = old_value;
699 } else {
700 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
701 // each new setting adds another LINE to the switch:
702 sprintf(buf, "%s\n%s", old_value, new_value);
703 value = buf;
704 free_this_too = buf;
705 }
706 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
707 // CommandLineFlags always returns a pointer that needs freeing.
708 FREE_C_HEAP_ARRAY(char, value, mtInternal);
709 if (free_this_too != NULL) {
710 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
711 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
712 }
713 return true;
714 }
715
716 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
717
718 // range of acceptable characters spelled out for portability reasons
719 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
720 #define BUFLEN 255
721 char name[BUFLEN+1];
722 char dummy;
723
724 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
725 return set_bool_flag(name, false, origin);
726 }
727 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
728 return set_bool_flag(name, true, origin);
729 }
730
731 char punct;
732 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
733 const char* value = strchr(arg, '=') + 1;
734 Flag* flag = Flag::find_flag(name, strlen(name));
735 if (flag != NULL && flag->is_ccstr()) {
736 if (flag->ccstr_accumulates()) {
737 return append_to_string_flag(name, value, origin);
738 } else {
739 if (value[0] == '\0') {
740 value = NULL;
741 }
742 return set_string_flag(name, value, origin);
743 }
744 }
745 }
746
747 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
748 const char* value = strchr(arg, '=') + 1;
749 // -XX:Foo:=xxx will reset the string flag to the given value.
750 if (value[0] == '\0') {
751 value = NULL;
752 }
753 return set_string_flag(name, value, origin);
754 }
755
756 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
757 #define SIGNED_NUMBER_RANGE "[-0123456789]"
758 #define NUMBER_RANGE "[0123456789]"
759 char value[BUFLEN + 1];
760 char value2[BUFLEN + 1];
761 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
762 // Looks like a floating-point number -- try again with more lenient format string
763 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
764 return set_fp_numeric_flag(name, value, origin);
765 }
766 }
767
768 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
769 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
770 return set_numeric_flag(name, value, origin);
771 }
772
773 return false;
774 }
775
776 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
777 assert(bldarray != NULL, "illegal argument");
778
779 if (arg == NULL) {
780 return;
781 }
782
783 int new_count = *count + 1;
784
785 // expand the array and add arg to the last element
786 if (*bldarray == NULL) {
787 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
788 } else {
789 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
790 }
791 (*bldarray)[*count] = strdup(arg);
792 *count = new_count;
793 }
794
795 void Arguments::build_jvm_args(const char* arg) {
796 add_string(&_jvm_args_array, &_num_jvm_args, arg);
797 }
798
799 void Arguments::build_jvm_flags(const char* arg) {
800 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
801 }
802
803 // utility function to return a string that concatenates all
804 // strings in a given char** array
805 const char* Arguments::build_resource_string(char** args, int count) {
806 if (args == NULL || count == 0) {
807 return NULL;
808 }
809 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
810 for (int i = 1; i < count; i++) {
811 length += strlen(args[i]) + 1; // add 1 for a space
812 }
813 char* s = NEW_RESOURCE_ARRAY(char, length);
814 strcpy(s, args[0]);
815 for (int j = 1; j < count; j++) {
816 strcat(s, " ");
817 strcat(s, args[j]);
818 }
819 return (const char*) s;
820 }
821
822 void Arguments::print_on(outputStream* st) {
823 st->print_cr("VM Arguments:");
824 if (num_jvm_flags() > 0) {
825 st->print("jvm_flags: "); print_jvm_flags_on(st);
826 }
827 if (num_jvm_args() > 0) {
828 st->print("jvm_args: "); print_jvm_args_on(st);
829 }
830 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
831 if (_java_class_path != NULL) {
832 char* path = _java_class_path->value();
833 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
834 }
835 st->print_cr("Launcher Type: %s", _sun_java_launcher);
836 }
837
838 void Arguments::print_jvm_flags_on(outputStream* st) {
839 if (_num_jvm_flags > 0) {
840 for (int i=0; i < _num_jvm_flags; i++) {
841 st->print("%s ", _jvm_flags_array[i]);
842 }
843 st->cr();
844 }
845 }
846
847 void Arguments::print_jvm_args_on(outputStream* st) {
848 if (_num_jvm_args > 0) {
849 for (int i=0; i < _num_jvm_args; i++) {
850 st->print("%s ", _jvm_args_array[i]);
851 }
852 st->cr();
853 }
854 }
855
856 bool Arguments::process_argument(const char* arg,
857 jboolean ignore_unrecognized, Flag::Flags origin) {
858
859 JDK_Version since = JDK_Version();
860
861 if (parse_argument(arg, origin) || ignore_unrecognized) {
862 return true;
863 }
864
865 bool has_plus_minus = (*arg == '+' || *arg == '-');
866 const char* const argname = has_plus_minus ? arg + 1 : arg;
867 if (is_newly_obsolete(arg, &since)) {
868 char version[256];
869 since.to_string(version, sizeof(version));
870 warning("ignoring option %s; support was removed in %s", argname, version);
871 return true;
872 }
873
874 // For locked flags, report a custom error message if available.
875 // Otherwise, report the standard unrecognized VM option.
876
877 size_t arg_len;
878 const char* equal_sign = strchr(argname, '=');
879 if (equal_sign == NULL) {
880 arg_len = strlen(argname);
881 } else {
882 arg_len = equal_sign - argname;
883 }
884
885 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
886 if (found_flag != NULL) {
887 char locked_message_buf[BUFLEN];
888 found_flag->get_locked_message(locked_message_buf, BUFLEN);
889 if (strlen(locked_message_buf) == 0) {
890 if (found_flag->is_bool() && !has_plus_minus) {
891 jio_fprintf(defaultStream::error_stream(),
892 "Missing +/- setting for VM option '%s'\n", argname);
893 } else if (!found_flag->is_bool() && has_plus_minus) {
894 jio_fprintf(defaultStream::error_stream(),
895 "Unexpected +/- setting in VM option '%s'\n", argname);
896 } else {
897 jio_fprintf(defaultStream::error_stream(),
898 "Improperly specified VM option '%s'\n", argname);
899 }
900 } else {
901 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
902 }
903 } else {
904 jio_fprintf(defaultStream::error_stream(),
905 "Unrecognized VM option '%s'\n", argname);
906 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
907 if (fuzzy_matched != NULL) {
908 jio_fprintf(defaultStream::error_stream(),
909 "Did you mean '%s%s%s'?\n",
910 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
911 fuzzy_matched->_name,
912 (fuzzy_matched->is_bool()) ? "" : "=<value>");
913 }
914 }
915
916 // allow for commandline "commenting out" options like -XX:#+Verbose
917 return arg[0] == '#';
918 }
919
920 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
921 FILE* stream = fopen(file_name, "rb");
922 if (stream == NULL) {
923 if (should_exist) {
924 jio_fprintf(defaultStream::error_stream(),
925 "Could not open settings file %s\n", file_name);
926 return false;
927 } else {
928 return true;
929 }
930 }
931
932 char token[1024];
933 int pos = 0;
934
935 bool in_white_space = true;
936 bool in_comment = false;
937 bool in_quote = false;
938 char quote_c = 0;
939 bool result = true;
940
941 int c = getc(stream);
942 while(c != EOF && pos < (int)(sizeof(token)-1)) {
943 if (in_white_space) {
944 if (in_comment) {
945 if (c == '\n') in_comment = false;
946 } else {
947 if (c == '#') in_comment = true;
948 else if (!isspace(c)) {
949 in_white_space = false;
950 token[pos++] = c;
951 }
952 }
953 } else {
954 if (c == '\n' || (!in_quote && isspace(c))) {
955 // token ends at newline, or at unquoted whitespace
956 // this allows a way to include spaces in string-valued options
957 token[pos] = '\0';
958 logOption(token);
959 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
960 build_jvm_flags(token);
961 pos = 0;
962 in_white_space = true;
963 in_quote = false;
964 } else if (!in_quote && (c == '\'' || c == '"')) {
965 in_quote = true;
966 quote_c = c;
967 } else if (in_quote && (c == quote_c)) {
968 in_quote = false;
969 } else {
970 token[pos++] = c;
971 }
972 }
973 c = getc(stream);
974 }
975 if (pos > 0) {
976 token[pos] = '\0';
977 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
978 build_jvm_flags(token);
979 }
980 fclose(stream);
981 return result;
982 }
983
984 //=============================================================================================================
985 // Parsing of properties (-D)
986
987 const char* Arguments::get_property(const char* key) {
988 return PropertyList_get_value(system_properties(), key);
989 }
990
991 bool Arguments::add_property(const char* prop) {
992 const char* eq = strchr(prop, '=');
993 char* key;
994 // ns must be static--its address may be stored in a SystemProperty object.
995 const static char ns[1] = {0};
996 char* value = (char *)ns;
997
998 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
999 key = AllocateHeap(key_len + 1, mtInternal);
1000 strncpy(key, prop, key_len);
1001 key[key_len] = '\0';
1002
1003 if (eq != NULL) {
1004 size_t value_len = strlen(prop) - key_len - 1;
1005 value = AllocateHeap(value_len + 1, mtInternal);
1006 strncpy(value, &prop[key_len + 1], value_len + 1);
1007 }
1008
1009 if (strcmp(key, "java.compiler") == 0) {
1010 process_java_compiler_argument(value);
1011 FreeHeap(key);
1012 if (eq != NULL) {
1013 FreeHeap(value);
1014 }
1015 return true;
1016 } else if (strcmp(key, "sun.java.command") == 0) {
1017 _java_command = value;
1018
1019 // Record value in Arguments, but let it get passed to Java.
1020 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1021 // launcher.pid property is private and is processed
1022 // in process_sun_java_launcher_properties();
1023 // the sun.java.launcher property is passed on to the java application
1024 FreeHeap(key);
1025 if (eq != NULL) {
1026 FreeHeap(value);
1027 }
1028 return true;
1029 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1030 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1031 // its value without going through the property list or making a Java call.
1032 _java_vendor_url_bug = value;
1033 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1034 PropertyList_unique_add(&_system_properties, key, value, true);
1035 return true;
1036 }
1037 // Create new property and add at the end of the list
1038 PropertyList_unique_add(&_system_properties, key, value);
1039 return true;
1040 }
1041
1042 //===========================================================================================================
1043 // Setting int/mixed/comp mode flags
1044
1045 void Arguments::set_mode_flags(Mode mode) {
1046 // Set up default values for all flags.
1047 // If you add a flag to any of the branches below,
1048 // add a default value for it here.
1049 set_java_compiler(false);
1050 _mode = mode;
1051
1052 // Ensure Agent_OnLoad has the correct initial values.
1053 // This may not be the final mode; mode may change later in onload phase.
1054 PropertyList_unique_add(&_system_properties, "java.vm.info",
1055 (char*)VM_Version::vm_info_string(), false);
1056
1057 UseInterpreter = true;
1058 UseCompiler = true;
1059 UseLoopCounter = true;
1060
1061 #ifndef ZERO
1062 // Turn these off for mixed and comp. Leave them on for Zero.
1063 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1064 UseFastAccessorMethods = (mode == _int);
1065 }
1066 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1067 UseFastEmptyMethods = (mode == _int);
1068 }
1069 #endif
1070
1071 // Default values may be platform/compiler dependent -
1072 // use the saved values
1073 ClipInlining = Arguments::_ClipInlining;
1074 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1075 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1076 BackgroundCompilation = Arguments::_BackgroundCompilation;
1077
1078 // Change from defaults based on mode
1079 switch (mode) {
1080 default:
1081 ShouldNotReachHere();
1082 break;
1083 case _int:
1084 UseCompiler = false;
1085 UseLoopCounter = false;
1086 AlwaysCompileLoopMethods = false;
1087 UseOnStackReplacement = false;
1088 break;
1089 case _mixed:
1090 // same as default
1091 break;
1092 case _comp:
1093 UseInterpreter = false;
1094 BackgroundCompilation = false;
1095 ClipInlining = false;
1096 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1097 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1098 // compile a level 4 (C2) and then continue executing it.
1099 if (TieredCompilation) {
1100 Tier3InvokeNotifyFreqLog = 0;
1101 Tier4InvocationThreshold = 0;
1102 }
1103 break;
1104 }
1105 }
1106
1107 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1108 // Conflict: required to use shared spaces (-Xshare:on), but
1109 // incompatible command line options were chosen.
1110
1111 static void no_shared_spaces() {
1112 if (RequireSharedSpaces) {
1113 jio_fprintf(defaultStream::error_stream(),
1114 "Class data sharing is inconsistent with other specified options.\n");
1115 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1116 } else {
1117 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1118 }
1119 }
1120 #endif
1121
1122 void Arguments::set_tiered_flags() {
1123 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1124 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1125 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1126 }
1127 if (CompilationPolicyChoice < 2) {
1128 vm_exit_during_initialization(
1129 "Incompatible compilation policy selected", NULL);
1130 }
1131 // Increase the code cache size - tiered compiles a lot more.
1132 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1133 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1134 }
1135 if (!UseInterpreter) { // -Xcomp
1136 Tier3InvokeNotifyFreqLog = 0;
1137 Tier4InvocationThreshold = 0;
1138 }
1139 }
1140
1141 #if INCLUDE_ALL_GCS
1142 static void disable_adaptive_size_policy(const char* collector_name) {
1143 if (UseAdaptiveSizePolicy) {
1144 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1145 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1146 collector_name);
1147 }
1148 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1149 }
1150 }
1151
1152 void Arguments::set_parnew_gc_flags() {
1153 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1154 "control point invariant");
1155 assert(UseParNewGC, "Error");
1156
1157 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1158 disable_adaptive_size_policy("UseParNewGC");
1159
1160 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1161 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1162 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1163 } else if (ParallelGCThreads == 0) {
1164 jio_fprintf(defaultStream::error_stream(),
1165 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1166 vm_exit(1);
1167 }
1168
1169 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1170 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1171 // we set them to 1024 and 1024.
1172 // See CR 6362902.
1173 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1174 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1175 }
1176 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1177 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1178 }
1179
1180 // AlwaysTenure flag should make ParNew promote all at first collection.
1181 // See CR 6362902.
1182 if (AlwaysTenure) {
1183 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1184 }
1185 // When using compressed oops, we use local overflow stacks,
1186 // rather than using a global overflow list chained through
1187 // the klass word of the object's pre-image.
1188 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1189 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1190 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1191 }
1192 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1193 }
1194 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1195 }
1196
1197 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1198 // sparc/solaris for certain applications, but would gain from
1199 // further optimization and tuning efforts, and would almost
1200 // certainly gain from analysis of platform and environment.
1201 void Arguments::set_cms_and_parnew_gc_flags() {
1202 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1203 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1204
1205 // If we are using CMS, we prefer to UseParNewGC,
1206 // unless explicitly forbidden.
1207 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1208 FLAG_SET_ERGO(bool, UseParNewGC, true);
1209 }
1210
1211 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1212 disable_adaptive_size_policy("UseConcMarkSweepGC");
1213
1214 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1215 // as needed.
1216 if (UseParNewGC) {
1217 set_parnew_gc_flags();
1218 }
1219
1220 size_t max_heap = align_size_down(MaxHeapSize,
1221 CardTableRS::ct_max_alignment_constraint());
1222
1223 // Now make adjustments for CMS
1224 intx tenuring_default = (intx)6;
1225 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1226
1227 // Preferred young gen size for "short" pauses:
1228 // upper bound depends on # of threads and NewRatio.
1229 const uintx parallel_gc_threads =
1230 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1231 const size_t preferred_max_new_size_unaligned =
1232 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1233 size_t preferred_max_new_size =
1234 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1235
1236 // Unless explicitly requested otherwise, size young gen
1237 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1238
1239 // If either MaxNewSize or NewRatio is set on the command line,
1240 // assume the user is trying to set the size of the young gen.
1241 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1242
1243 // Set MaxNewSize to our calculated preferred_max_new_size unless
1244 // NewSize was set on the command line and it is larger than
1245 // preferred_max_new_size.
1246 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1247 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1248 } else {
1249 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1250 }
1251 if (PrintGCDetails && Verbose) {
1252 // Too early to use gclog_or_tty
1253 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1254 }
1255
1256 // Code along this path potentially sets NewSize and OldSize
1257 if (PrintGCDetails && Verbose) {
1258 // Too early to use gclog_or_tty
1259 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1260 " initial_heap_size: " SIZE_FORMAT
1261 " max_heap: " SIZE_FORMAT,
1262 min_heap_size(), InitialHeapSize, max_heap);
1263 }
1264 size_t min_new = preferred_max_new_size;
1265 if (FLAG_IS_CMDLINE(NewSize)) {
1266 min_new = NewSize;
1267 }
1268 if (max_heap > min_new && min_heap_size() > min_new) {
1269 // Unless explicitly requested otherwise, make young gen
1270 // at least min_new, and at most preferred_max_new_size.
1271 if (FLAG_IS_DEFAULT(NewSize)) {
1272 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1273 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1274 if (PrintGCDetails && Verbose) {
1275 // Too early to use gclog_or_tty
1276 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1277 }
1278 }
1279 // Unless explicitly requested otherwise, size old gen
1280 // so it's NewRatio x of NewSize.
1281 if (FLAG_IS_DEFAULT(OldSize)) {
1282 if (max_heap > NewSize) {
1283 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1284 if (PrintGCDetails && Verbose) {
1285 // Too early to use gclog_or_tty
1286 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1287 }
1288 }
1289 }
1290 }
1291 }
1292 // Unless explicitly requested otherwise, definitely
1293 // promote all objects surviving "tenuring_default" scavenges.
1294 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1295 FLAG_IS_DEFAULT(SurvivorRatio)) {
1296 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1297 }
1298 // If we decided above (or user explicitly requested)
1299 // `promote all' (via MaxTenuringThreshold := 0),
1300 // prefer minuscule survivor spaces so as not to waste
1301 // space for (non-existent) survivors
1302 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1303 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1304 }
1305 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1306 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1307 // This is done in order to make ParNew+CMS configuration to work
1308 // with YoungPLABSize and OldPLABSize options.
1309 // See CR 6362902.
1310 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1311 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1312 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1313 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1314 // the value (either from the command line or ergonomics) of
1315 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1316 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1317 } else {
1318 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1319 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1320 // we'll let it to take precedence.
1321 jio_fprintf(defaultStream::error_stream(),
1322 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1323 " options are specified for the CMS collector."
1324 " CMSParPromoteBlocksToClaim will take precedence.\n");
1325 }
1326 }
1327 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1328 // OldPLAB sizing manually turned off: Use a larger default setting,
1329 // unless it was manually specified. This is because a too-low value
1330 // will slow down scavenges.
1331 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1332 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1333 }
1334 }
1335 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1336 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1337 // If either of the static initialization defaults have changed, note this
1338 // modification.
1339 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1340 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1341 }
1342 if (PrintGCDetails && Verbose) {
1343 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1344 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1345 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1346 }
1347 }
1348 #endif // INCLUDE_ALL_GCS
1349
1350 void set_object_alignment() {
1351 // Object alignment.
1352 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1353 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1354 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1355 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1356 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1357 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1358
1359 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1360 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1361
1362 // Oop encoding heap max
1363 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1364
1365 #if INCLUDE_ALL_GCS
1366 // Set CMS global values
1367 CompactibleFreeListSpace::set_cms_values();
1368 #endif // INCLUDE_ALL_GCS
1369 }
1370
1371 bool verify_object_alignment() {
1372 // Object alignment.
1373 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1374 jio_fprintf(defaultStream::error_stream(),
1375 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1376 (int)ObjectAlignmentInBytes);
1377 return false;
1378 }
1379 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1380 jio_fprintf(defaultStream::error_stream(),
1381 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1382 (int)ObjectAlignmentInBytes, BytesPerLong);
1383 return false;
1384 }
1385 // It does not make sense to have big object alignment
1386 // since a space lost due to alignment will be greater
1387 // then a saved space from compressed oops.
1388 if ((int)ObjectAlignmentInBytes > 256) {
1389 jio_fprintf(defaultStream::error_stream(),
1390 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1391 (int)ObjectAlignmentInBytes);
1392 return false;
1393 }
1394 // In case page size is very small.
1395 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1396 jio_fprintf(defaultStream::error_stream(),
1397 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1398 (int)ObjectAlignmentInBytes, os::vm_page_size());
1399 return false;
1400 }
1401 return true;
1402 }
1403
1404 size_t Arguments::max_heap_for_compressed_oops() {
1405 // Avoid sign flip.
1406 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1407 // We need to fit both the NULL page and the heap into the memory budget, while
1408 // keeping alignment constraints of the heap. To guarantee the latter, as the
1409 // NULL page is located before the heap, we pad the NULL page to the conservative
1410 // maximum alignment that the GC may ever impose upon the heap.
1411 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1412 _conservative_max_heap_alignment);
1413
1414 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1415 NOT_LP64(ShouldNotReachHere(); return 0);
1416 }
1417
1418 bool Arguments::should_auto_select_low_pause_collector() {
1419 if (UseAutoGCSelectPolicy &&
1420 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1421 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1422 if (PrintGCDetails) {
1423 // Cannot use gclog_or_tty yet.
1424 tty->print_cr("Automatic selection of the low pause collector"
1425 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1426 }
1427 return true;
1428 }
1429 return false;
1430 }
1431
1432 void Arguments::set_use_compressed_oops() {
1433 #ifndef ZERO
1434 #ifdef _LP64
1435 // MaxHeapSize is not set up properly at this point, but
1436 // the only value that can override MaxHeapSize if we are
1437 // to use UseCompressedOops is InitialHeapSize.
1438 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1439
1440 if (max_heap_size <= max_heap_for_compressed_oops()) {
1441 #if !defined(COMPILER1) || defined(TIERED)
1442 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1443 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1444 }
1445 #endif
1446 #ifdef _WIN64
1447 if (UseLargePages && UseCompressedOops) {
1448 // Cannot allocate guard pages for implicit checks in indexed addressing
1449 // mode, when large pages are specified on windows.
1450 // This flag could be switched ON if narrow oop base address is set to 0,
1451 // see code in Universe::initialize_heap().
1452 Universe::set_narrow_oop_use_implicit_null_checks(false);
1453 }
1454 #endif // _WIN64
1455 } else {
1456 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1457 warning("Max heap size too large for Compressed Oops");
1458 FLAG_SET_DEFAULT(UseCompressedOops, false);
1459 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1460 }
1461 }
1462 #endif // _LP64
1463 #endif // ZERO
1464 }
1465
1466
1467 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1468 // set_use_compressed_oops().
1469 void Arguments::set_use_compressed_klass_ptrs() {
1470 #ifndef ZERO
1471 #ifdef _LP64
1472 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1473 if (!UseCompressedOops) {
1474 if (UseCompressedClassPointers) {
1475 warning("UseCompressedClassPointers requires UseCompressedOops");
1476 }
1477 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1478 } else {
1479 // Turn on UseCompressedClassPointers too
1480 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1481 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1482 }
1483 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1484 if (UseCompressedClassPointers) {
1485 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1486 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1487 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1488 }
1489 }
1490 }
1491 #endif // _LP64
1492 #endif // !ZERO
1493 }
1494
1495 void Arguments::set_conservative_max_heap_alignment() {
1496 // The conservative maximum required alignment for the heap is the maximum of
1497 // the alignments imposed by several sources: any requirements from the heap
1498 // itself, the collector policy and the maximum page size we may run the VM
1499 // with.
1500 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1501 #if INCLUDE_ALL_GCS
1502 if (UseParallelGC) {
1503 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1504 } else if (UseG1GC) {
1505 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1506 }
1507 #endif // INCLUDE_ALL_GCS
1508 _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(),
1509 CollectorPolicy::compute_heap_alignment());
1510 }
1511
1512 void Arguments::set_ergonomics_flags() {
1513
1514 if (os::is_server_class_machine()) {
1515 // If no other collector is requested explicitly,
1516 // let the VM select the collector based on
1517 // machine class and automatic selection policy.
1518 if (!UseSerialGC &&
1519 !UseConcMarkSweepGC &&
1520 !UseG1GC &&
1521 !UseParNewGC &&
1522 FLAG_IS_DEFAULT(UseParallelGC)) {
1523 if (should_auto_select_low_pause_collector()) {
1524 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1525 } else {
1526 FLAG_SET_ERGO(bool, UseParallelGC, true);
1527 }
1528 }
1529 }
1530 #ifdef COMPILER2
1531 // Shared spaces work fine with other GCs but causes bytecode rewriting
1532 // to be disabled, which hurts interpreter performance and decreases
1533 // server performance. When -server is specified, keep the default off
1534 // unless it is asked for. Future work: either add bytecode rewriting
1535 // at link time, or rewrite bytecodes in non-shared methods.
1536 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1537 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1538 no_shared_spaces();
1539 }
1540 #endif
1541
1542 set_conservative_max_heap_alignment();
1543
1544 #ifndef ZERO
1545 #ifdef _LP64
1546 set_use_compressed_oops();
1547
1548 // set_use_compressed_klass_ptrs() must be called after calling
1549 // set_use_compressed_oops().
1550 set_use_compressed_klass_ptrs();
1551
1552 // Also checks that certain machines are slower with compressed oops
1553 // in vm_version initialization code.
1554 #endif // _LP64
1555 #endif // !ZERO
1556 }
1557
1558 void Arguments::set_parallel_gc_flags() {
1559 assert(UseParallelGC || UseParallelOldGC, "Error");
1560 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1561 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1562 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1563 }
1564 FLAG_SET_DEFAULT(UseParallelGC, true);
1565
1566 // If no heap maximum was requested explicitly, use some reasonable fraction
1567 // of the physical memory, up to a maximum of 1GB.
1568 FLAG_SET_DEFAULT(ParallelGCThreads,
1569 Abstract_VM_Version::parallel_worker_threads());
1570 if (ParallelGCThreads == 0) {
1571 jio_fprintf(defaultStream::error_stream(),
1572 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1573 vm_exit(1);
1574 }
1575
1576 if (UseAdaptiveSizePolicy) {
1577 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1578 // unless the user actually sets these flags.
1579 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1580 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1581 }
1582 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1583 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1584 }
1585 }
1586
1587 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1588 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1589 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1590 // See CR 6362902 for details.
1591 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1592 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1593 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1594 }
1595 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1596 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1597 }
1598 }
1599
1600 if (UseParallelOldGC) {
1601 // Par compact uses lower default values since they are treated as
1602 // minimums. These are different defaults because of the different
1603 // interpretation and are not ergonomically set.
1604 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1605 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1606 }
1607 }
1608 }
1609
1610 void Arguments::set_g1_gc_flags() {
1611 assert(UseG1GC, "Error");
1612 #ifdef COMPILER1
1613 FastTLABRefill = false;
1614 #endif
1615 FLAG_SET_DEFAULT(ParallelGCThreads,
1616 Abstract_VM_Version::parallel_worker_threads());
1617 if (ParallelGCThreads == 0) {
1618 FLAG_SET_DEFAULT(ParallelGCThreads,
1619 Abstract_VM_Version::parallel_worker_threads());
1620 }
1621
1622 // MarkStackSize will be set (if it hasn't been set by the user)
1623 // when concurrent marking is initialized.
1624 // Its value will be based upon the number of parallel marking threads.
1625 // But we do set the maximum mark stack size here.
1626 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1627 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1628 }
1629
1630 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1631 // In G1, we want the default GC overhead goal to be higher than
1632 // say in PS. So we set it here to 10%. Otherwise the heap might
1633 // be expanded more aggressively than we would like it to. In
1634 // fact, even 10% seems to not be high enough in some cases
1635 // (especially small GC stress tests that the main thing they do
1636 // is allocation). We might consider increase it further.
1637 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1638 }
1639
1640 if (PrintGCDetails && Verbose) {
1641 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1642 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1643 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1644 }
1645 }
1646
1647 julong Arguments::limit_by_allocatable_memory(julong limit) {
1648 julong max_allocatable;
1649 julong result = limit;
1650 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1651 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1652 }
1653 return result;
1654 }
1655
1656 void Arguments::set_heap_size() {
1657 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1658 // Deprecated flag
1659 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1660 }
1661
1662 const julong phys_mem =
1663 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1664 : (julong)MaxRAM;
1665
1666 // If the maximum heap size has not been set with -Xmx,
1667 // then set it as fraction of the size of physical memory,
1668 // respecting the maximum and minimum sizes of the heap.
1669 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1670 julong reasonable_max = phys_mem / MaxRAMFraction;
1671
1672 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1673 // Small physical memory, so use a minimum fraction of it for the heap
1674 reasonable_max = phys_mem / MinRAMFraction;
1675 } else {
1676 // Not-small physical memory, so require a heap at least
1677 // as large as MaxHeapSize
1678 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1679 }
1680 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1681 // Limit the heap size to ErgoHeapSizeLimit
1682 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1683 }
1684 if (UseCompressedOops) {
1685 // Limit the heap size to the maximum possible when using compressed oops
1686 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1687 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1688 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1689 // but it should be not less than default MaxHeapSize.
1690 max_coop_heap -= HeapBaseMinAddress;
1691 }
1692 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1693 }
1694 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1695
1696 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1697 // An initial heap size was specified on the command line,
1698 // so be sure that the maximum size is consistent. Done
1699 // after call to limit_by_allocatable_memory because that
1700 // method might reduce the allocation size.
1701 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1702 }
1703
1704 if (PrintGCDetails && Verbose) {
1705 // Cannot use gclog_or_tty yet.
1706 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1707 }
1708 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1709 }
1710
1711 // If the minimum or initial heap_size have not been set or requested to be set
1712 // ergonomically, set them accordingly.
1713 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1714 julong reasonable_minimum = (julong)(OldSize + NewSize);
1715
1716 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1717
1718 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1719
1720 if (InitialHeapSize == 0) {
1721 julong reasonable_initial = phys_mem / InitialRAMFraction;
1722
1723 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1724 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1725
1726 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1727
1728 if (PrintGCDetails && Verbose) {
1729 // Cannot use gclog_or_tty yet.
1730 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1731 }
1732 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1733 }
1734 // If the minimum heap size has not been set (via -Xms),
1735 // synchronize with InitialHeapSize to avoid errors with the default value.
1736 if (min_heap_size() == 0) {
1737 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1738 if (PrintGCDetails && Verbose) {
1739 // Cannot use gclog_or_tty yet.
1740 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1741 }
1742 }
1743 }
1744 }
1745
1746 // This must be called after ergonomics because we want bytecode rewriting
1747 // if the server compiler is used, or if UseSharedSpaces is disabled.
1748 void Arguments::set_bytecode_flags() {
1749 // Better not attempt to store into a read-only space.
1750 if (UseSharedSpaces) {
1751 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1752 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1753 }
1754
1755 if (!RewriteBytecodes) {
1756 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1757 }
1758 }
1759
1760 // Aggressive optimization flags -XX:+AggressiveOpts
1761 void Arguments::set_aggressive_opts_flags() {
1762 #ifdef COMPILER2
1763 if (AggressiveUnboxing) {
1764 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1765 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1766 } else if (!EliminateAutoBox) {
1767 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1768 AggressiveUnboxing = false;
1769 }
1770 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1771 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1772 } else if (!DoEscapeAnalysis) {
1773 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1774 AggressiveUnboxing = false;
1775 }
1776 }
1777 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1778 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1779 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1780 }
1781 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1782 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1783 }
1784
1785 // Feed the cache size setting into the JDK
1786 char buffer[1024];
1787 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1788 add_property(buffer);
1789 }
1790 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1791 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1792 }
1793 #endif
1794
1795 if (AggressiveOpts) {
1796 // Sample flag setting code
1797 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1798 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1799 // }
1800 }
1801 }
1802
1803 //===========================================================================================================
1804 // Parsing of java.compiler property
1805
1806 void Arguments::process_java_compiler_argument(char* arg) {
1807 // For backwards compatibility, Djava.compiler=NONE or ""
1808 // causes us to switch to -Xint mode UNLESS -Xdebug
1809 // is also specified.
1810 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1811 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1812 }
1813 }
1814
1815 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1816 _sun_java_launcher = strdup(launcher);
1817 if (strcmp("gamma", _sun_java_launcher) == 0) {
1818 _created_by_gamma_launcher = true;
1819 }
1820 }
1821
1822 bool Arguments::created_by_java_launcher() {
1823 assert(_sun_java_launcher != NULL, "property must have value");
1824 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1825 }
1826
1827 bool Arguments::created_by_gamma_launcher() {
1828 return _created_by_gamma_launcher;
1829 }
1830
1831 //===========================================================================================================
1832 // Parsing of main arguments
1833
1834 bool Arguments::verify_interval(uintx val, uintx min,
1835 uintx max, const char* name) {
1836 // Returns true iff value is in the inclusive interval [min..max]
1837 // false, otherwise.
1838 if (val >= min && val <= max) {
1839 return true;
1840 }
1841 jio_fprintf(defaultStream::error_stream(),
1842 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1843 " and " UINTX_FORMAT "\n",
1844 name, val, min, max);
1845 return false;
1846 }
1847
1848 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1849 // Returns true if given value is at least specified min threshold
1850 // false, otherwise.
1851 if (val >= min ) {
1852 return true;
1853 }
1854 jio_fprintf(defaultStream::error_stream(),
1855 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1856 name, val, min);
1857 return false;
1858 }
1859
1860 bool Arguments::verify_percentage(uintx value, const char* name) {
1861 if (is_percentage(value)) {
1862 return true;
1863 }
1864 jio_fprintf(defaultStream::error_stream(),
1865 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1866 name, value);
1867 return false;
1868 }
1869
1870 #if !INCLUDE_ALL_GCS
1871 #ifdef ASSERT
1872 static bool verify_serial_gc_flags() {
1873 return (UseSerialGC &&
1874 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1875 UseParallelGC || UseParallelOldGC));
1876 }
1877 #endif // ASSERT
1878 #endif // INCLUDE_ALL_GCS
1879
1880 // check if do gclog rotation
1881 // +UseGCLogFileRotation is a must,
1882 // no gc log rotation when log file not supplied or
1883 // NumberOfGCLogFiles is 0
1884 void check_gclog_consistency() {
1885 if (UseGCLogFileRotation) {
1886 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1887 jio_fprintf(defaultStream::output_stream(),
1888 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1889 "where num_of_file > 0\n"
1890 "GC log rotation is turned off\n");
1891 UseGCLogFileRotation = false;
1892 }
1893 }
1894
1895 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1896 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1897 jio_fprintf(defaultStream::output_stream(),
1898 "GCLogFileSize changed to minimum 8K\n");
1899 }
1900 }
1901
1902 // This function is called for -Xloggc:<filename>, it can be used
1903 // to check if a given file name(or string) conforms to the following
1904 // specification:
1905 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1906 // %p and %t only allowed once. We only limit usage of filename not path
1907 bool is_filename_valid(const char *file_name) {
1908 const char* p = file_name;
1909 char file_sep = os::file_separator()[0];
1910 const char* cp;
1911 // skip prefix path
1912 for (cp = file_name; *cp != '\0'; cp++) {
1913 if (*cp == '/' || *cp == file_sep) {
1914 p = cp + 1;
1915 }
1916 }
1917
1918 int count_p = 0;
1919 int count_t = 0;
1920 while (*p != '\0') {
1921 if ((*p >= '0' && *p <= '9') ||
1922 (*p >= 'A' && *p <= 'Z') ||
1923 (*p >= 'a' && *p <= 'z') ||
1924 *p == '-' ||
1925 *p == '_' ||
1926 *p == '.') {
1927 p++;
1928 continue;
1929 }
1930 if (*p == '%') {
1931 if(*(p + 1) == 'p') {
1932 p += 2;
1933 count_p ++;
1934 continue;
1935 }
1936 if (*(p + 1) == 't') {
1937 p += 2;
1938 count_t ++;
1939 continue;
1940 }
1941 }
1942 return false;
1943 }
1944 return count_p < 2 && count_t < 2;
1945 }
1946
1947 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
1948 if (!is_percentage(min_heap_free_ratio)) {
1949 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
1950 return false;
1951 }
1952 if (min_heap_free_ratio > MaxHeapFreeRatio) {
1953 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1954 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
1955 MaxHeapFreeRatio);
1956 return false;
1957 }
1958 return true;
1959 }
1960
1961 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
1962 if (!is_percentage(max_heap_free_ratio)) {
1963 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
1964 return false;
1965 }
1966 if (max_heap_free_ratio < MinHeapFreeRatio) {
1967 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
1968 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
1969 MinHeapFreeRatio);
1970 return false;
1971 }
1972 return true;
1973 }
1974
1975 // Check consistency of GC selection
1976 bool Arguments::check_gc_consistency() {
1977 check_gclog_consistency();
1978 bool status = true;
1979 // Ensure that the user has not selected conflicting sets
1980 // of collectors. [Note: this check is merely a user convenience;
1981 // collectors over-ride each other so that only a non-conflicting
1982 // set is selected; however what the user gets is not what they
1983 // may have expected from the combination they asked for. It's
1984 // better to reduce user confusion by not allowing them to
1985 // select conflicting combinations.
1986 uint i = 0;
1987 if (UseSerialGC) i++;
1988 if (UseConcMarkSweepGC || UseParNewGC) i++;
1989 if (UseParallelGC || UseParallelOldGC) i++;
1990 if (UseG1GC) i++;
1991 if (i > 1) {
1992 jio_fprintf(defaultStream::error_stream(),
1993 "Conflicting collector combinations in option list; "
1994 "please refer to the release notes for the combinations "
1995 "allowed\n");
1996 status = false;
1997 }
1998 return status;
1999 }
2000
2001 void Arguments::check_deprecated_gcs() {
2002 if (UseConcMarkSweepGC && !UseParNewGC) {
2003 warning("Using the DefNew young collector with the CMS collector is deprecated "
2004 "and will likely be removed in a future release");
2005 }
2006
2007 if (UseParNewGC && !UseConcMarkSweepGC) {
2008 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2009 // set up UseSerialGC properly, so that can't be used in the check here.
2010 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2011 "and will likely be removed in a future release");
2012 }
2013
2014 if (CMSIncrementalMode) {
2015 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2016 }
2017 }
2018
2019 void Arguments::check_deprecated_gc_flags() {
2020 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2021 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2022 "and will likely be removed in future release");
2023 }
2024 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2025 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2026 "Use MaxRAMFraction instead.");
2027 }
2028 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2029 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2030 }
2031 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2032 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2033 }
2034 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2035 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2036 }
2037 }
2038
2039 // Check stack pages settings
2040 bool Arguments::check_stack_pages()
2041 {
2042 bool status = true;
2043 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2044 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2045 // greater stack shadow pages can't generate instruction to bang stack
2046 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2047 return status;
2048 }
2049
2050 // Check the consistency of vm_init_args
2051 bool Arguments::check_vm_args_consistency() {
2052 // Method for adding checks for flag consistency.
2053 // The intent is to warn the user of all possible conflicts,
2054 // before returning an error.
2055 // Note: Needs platform-dependent factoring.
2056 bool status = true;
2057
2058 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2059 // builds so the cost of stack banging can be measured.
2060 #if (defined(PRODUCT) && defined(SOLARIS))
2061 if (!UseBoundThreads && !UseStackBanging) {
2062 jio_fprintf(defaultStream::error_stream(),
2063 "-UseStackBanging conflicts with -UseBoundThreads\n");
2064
2065 status = false;
2066 }
2067 #endif
2068
2069 if (TLABRefillWasteFraction == 0) {
2070 jio_fprintf(defaultStream::error_stream(),
2071 "TLABRefillWasteFraction should be a denominator, "
2072 "not " SIZE_FORMAT "\n",
2073 TLABRefillWasteFraction);
2074 status = false;
2075 }
2076
2077 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2078 "AdaptiveSizePolicyWeight");
2079 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2080
2081 // Divide by bucket size to prevent a large size from causing rollover when
2082 // calculating amount of memory needed to be allocated for the String table.
2083 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2084 (max_uintx / StringTable::bucket_size()), "StringTable size");
2085
2086 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2087 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2088
2089 {
2090 // Using "else if" below to avoid printing two error messages if min > max.
2091 // This will also prevent us from reporting both min>100 and max>100 at the
2092 // same time, but that is less annoying than printing two identical errors IMHO.
2093 FormatBuffer<80> err_msg("%s","");
2094 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2095 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2096 status = false;
2097 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2098 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2099 status = false;
2100 }
2101 }
2102
2103 // Min/MaxMetaspaceFreeRatio
2104 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2105 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2106
2107 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2108 jio_fprintf(defaultStream::error_stream(),
2109 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2110 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2111 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2112 MinMetaspaceFreeRatio,
2113 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2114 MaxMetaspaceFreeRatio);
2115 status = false;
2116 }
2117
2118 // Trying to keep 100% free is not practical
2119 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2120
2121 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2122 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2123 }
2124
2125 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2126 // Settings to encourage splitting.
2127 if (!FLAG_IS_CMDLINE(NewRatio)) {
2128 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2129 }
2130 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2131 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2132 }
2133 }
2134
2135 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2136 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2137 if (GCTimeLimit == 100) {
2138 // Turn off gc-overhead-limit-exceeded checks
2139 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2140 }
2141
2142 status = status && check_gc_consistency();
2143 status = status && check_stack_pages();
2144
2145 if (CMSIncrementalMode) {
2146 if (!UseConcMarkSweepGC) {
2147 jio_fprintf(defaultStream::error_stream(),
2148 "error: invalid argument combination.\n"
2149 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2150 "selected in order\nto use CMSIncrementalMode.\n");
2151 status = false;
2152 } else {
2153 status = status && verify_percentage(CMSIncrementalDutyCycle,
2154 "CMSIncrementalDutyCycle");
2155 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2156 "CMSIncrementalDutyCycleMin");
2157 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2158 "CMSIncrementalSafetyFactor");
2159 status = status && verify_percentage(CMSIncrementalOffset,
2160 "CMSIncrementalOffset");
2161 status = status && verify_percentage(CMSExpAvgFactor,
2162 "CMSExpAvgFactor");
2163 // If it was not set on the command line, set
2164 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2165 if (CMSInitiatingOccupancyFraction < 0) {
2166 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2167 }
2168 }
2169 }
2170
2171 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2172 // insists that we hold the requisite locks so that the iteration is
2173 // MT-safe. For the verification at start-up and shut-down, we don't
2174 // yet have a good way of acquiring and releasing these locks,
2175 // which are not visible at the CollectedHeap level. We want to
2176 // be able to acquire these locks and then do the iteration rather
2177 // than just disable the lock verification. This will be fixed under
2178 // bug 4788986.
2179 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2180 if (VerifyDuringStartup) {
2181 warning("Heap verification at start-up disabled "
2182 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2183 VerifyDuringStartup = false; // Disable verification at start-up
2184 }
2185
2186 if (VerifyBeforeExit) {
2187 warning("Heap verification at shutdown disabled "
2188 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2189 VerifyBeforeExit = false; // Disable verification at shutdown
2190 }
2191 }
2192
2193 // Note: only executed in non-PRODUCT mode
2194 if (!UseAsyncConcMarkSweepGC &&
2195 (ExplicitGCInvokesConcurrent ||
2196 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2197 jio_fprintf(defaultStream::error_stream(),
2198 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2199 " with -UseAsyncConcMarkSweepGC");
2200 status = false;
2201 }
2202
2203 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2204
2205 #if INCLUDE_ALL_GCS
2206 if (UseG1GC) {
2207 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2208 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2209 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2210
2211 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2212 "InitiatingHeapOccupancyPercent");
2213 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2214 "G1RefProcDrainInterval");
2215 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2216 "G1ConcMarkStepDurationMillis");
2217 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2218 "G1ConcRSHotCardLimit");
2219 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2220 "G1ConcRSLogCacheSize");
2221 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2222 "StringDeduplicationAgeThreshold");
2223 }
2224 if (UseConcMarkSweepGC) {
2225 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2226 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2227 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2228 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2229
2230 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2231
2232 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2233 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2234 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2235
2236 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2237
2238 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2239 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2240
2241 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2242 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2243 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2244
2245 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2246
2247 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2248
2249 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2250 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2251 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2252 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2253 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2254 }
2255
2256 if (UseParallelGC || UseParallelOldGC) {
2257 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2258 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2259
2260 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2261 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2262
2263 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2264 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2265
2266 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2267
2268 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2269 }
2270 #endif // INCLUDE_ALL_GCS
2271
2272 status = status && verify_interval(RefDiscoveryPolicy,
2273 ReferenceProcessor::DiscoveryPolicyMin,
2274 ReferenceProcessor::DiscoveryPolicyMax,
2275 "RefDiscoveryPolicy");
2276
2277 // Limit the lower bound of this flag to 1 as it is used in a division
2278 // expression.
2279 status = status && verify_interval(TLABWasteTargetPercent,
2280 1, 100, "TLABWasteTargetPercent");
2281
2282 status = status && verify_object_alignment();
2283
2284 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2285 "CompressedClassSpaceSize");
2286
2287 status = status && verify_interval(MarkStackSizeMax,
2288 1, (max_jint - 1), "MarkStackSizeMax");
2289 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2290
2291 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2292
2293 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2294
2295 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2296
2297 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2298 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2299
2300 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2301
2302 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2303 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2304 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2305 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2306
2307 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2308 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2309
2310 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2311 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2312 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2313
2314 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2315 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2316
2317 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2318 // just for that, so hardcode here.
2319 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2320 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2321 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2322 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2323
2324 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2325
2326 if (PrintNMTStatistics) {
2327 #if INCLUDE_NMT
2328 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2329 #endif // INCLUDE_NMT
2330 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2331 PrintNMTStatistics = false;
2332 #if INCLUDE_NMT
2333 }
2334 #endif
2335 }
2336
2337 // Need to limit the extent of the padding to reasonable size.
2338 // 8K is well beyond the reasonable HW cache line size, even with the
2339 // aggressive prefetching, while still leaving the room for segregating
2340 // among the distinct pages.
2341 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2342 jio_fprintf(defaultStream::error_stream(),
2343 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2344 ContendedPaddingWidth, 0, 8192);
2345 status = false;
2346 }
2347
2348 // Need to enforce the padding not to break the existing field alignments.
2349 // It is sufficient to check against the largest type size.
2350 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2351 jio_fprintf(defaultStream::error_stream(),
2352 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2353 ContendedPaddingWidth, BytesPerLong);
2354 status = false;
2355 }
2356
2357 // Check lower bounds of the code cache
2358 // Template Interpreter code is approximately 3X larger in debug builds.
2359 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2360 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2361 jio_fprintf(defaultStream::error_stream(),
2362 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2363 os::vm_page_size()/K);
2364 status = false;
2365 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2366 jio_fprintf(defaultStream::error_stream(),
2367 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2368 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2369 status = false;
2370 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2371 jio_fprintf(defaultStream::error_stream(),
2372 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2373 min_code_cache_size/K);
2374 status = false;
2375 } else if (ReservedCodeCacheSize > 2*G) {
2376 // Code cache size larger than MAXINT is not supported.
2377 jio_fprintf(defaultStream::error_stream(),
2378 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2379 (2*G)/M);
2380 status = false;
2381 }
2382
2383 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2384 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2385
2386 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2387 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2388 }
2389
2390 status &= check_vm_args_consistency_ext();
2391
2392 return status;
2393 }
2394
2395 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2396 const char* option_type) {
2397 if (ignore) return false;
2398
2399 const char* spacer = " ";
2400 if (option_type == NULL) {
2401 option_type = ++spacer; // Set both to the empty string.
2402 }
2403
2404 if (os::obsolete_option(option)) {
2405 jio_fprintf(defaultStream::error_stream(),
2406 "Obsolete %s%soption: %s\n", option_type, spacer,
2407 option->optionString);
2408 return false;
2409 } else {
2410 jio_fprintf(defaultStream::error_stream(),
2411 "Unrecognized %s%soption: %s\n", option_type, spacer,
2412 option->optionString);
2413 return true;
2414 }
2415 }
2416
2417 static const char* user_assertion_options[] = {
2418 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2419 };
2420
2421 static const char* system_assertion_options[] = {
2422 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2423 };
2424
2425 // Return true if any of the strings in null-terminated array 'names' matches.
2426 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2427 // the option must match exactly.
2428 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2429 bool tail_allowed) {
2430 for (/* empty */; *names != NULL; ++names) {
2431 if (match_option(option, *names, tail)) {
2432 if (**tail == '\0' || tail_allowed && **tail == ':') {
2433 return true;
2434 }
2435 }
2436 }
2437 return false;
2438 }
2439
2440 bool Arguments::parse_uintx(const char* value,
2441 uintx* uintx_arg,
2442 uintx min_size) {
2443
2444 // Check the sign first since atomull() parses only unsigned values.
2445 bool value_is_positive = !(*value == '-');
2446
2447 if (value_is_positive) {
2448 julong n;
2449 bool good_return = atomull(value, &n);
2450 if (good_return) {
2451 bool above_minimum = n >= min_size;
2452 bool value_is_too_large = n > max_uintx;
2453
2454 if (above_minimum && !value_is_too_large) {
2455 *uintx_arg = n;
2456 return true;
2457 }
2458 }
2459 }
2460 return false;
2461 }
2462
2463 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2464 julong* long_arg,
2465 julong min_size) {
2466 if (!atomull(s, long_arg)) return arg_unreadable;
2467 return check_memory_size(*long_arg, min_size);
2468 }
2469
2470 // Parse JavaVMInitArgs structure
2471
2472 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2473 // For components of the system classpath.
2474 SysClassPath scp(Arguments::get_sysclasspath());
2475 bool scp_assembly_required = false;
2476
2477 // Save default settings for some mode flags
2478 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2479 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2480 Arguments::_ClipInlining = ClipInlining;
2481 Arguments::_BackgroundCompilation = BackgroundCompilation;
2482
2483 // Setup flags for mixed which is the default
2484 set_mode_flags(_mixed);
2485
2486 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2487 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2488 if (result != JNI_OK) {
2489 return result;
2490 }
2491
2492 // Parse JavaVMInitArgs structure passed in
2493 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2494 if (result != JNI_OK) {
2495 return result;
2496 }
2497
2498 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2499 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2500 if (result != JNI_OK) {
2501 return result;
2502 }
2503
2504 // Do final processing now that all arguments have been parsed
2505 result = finalize_vm_init_args(&scp, scp_assembly_required);
2506 if (result != JNI_OK) {
2507 return result;
2508 }
2509
2510 return JNI_OK;
2511 }
2512
2513 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2514 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2515 // are dealing with -agentpath (case where name is a path), otherwise with
2516 // -agentlib
2517 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2518 char *_name;
2519 const char *_hprof = "hprof", *_jdwp = "jdwp";
2520 size_t _len_hprof, _len_jdwp, _len_prefix;
2521
2522 if (is_path) {
2523 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2524 return false;
2525 }
2526
2527 _name++; // skip past last path separator
2528 _len_prefix = strlen(JNI_LIB_PREFIX);
2529
2530 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2531 return false;
2532 }
2533
2534 _name += _len_prefix;
2535 _len_hprof = strlen(_hprof);
2536 _len_jdwp = strlen(_jdwp);
2537
2538 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2539 _name += _len_hprof;
2540 }
2541 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2542 _name += _len_jdwp;
2543 }
2544 else {
2545 return false;
2546 }
2547
2548 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2549 return false;
2550 }
2551
2552 return true;
2553 }
2554
2555 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2556 return true;
2557 }
2558
2559 return false;
2560 }
2561
2562 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2563 SysClassPath* scp_p,
2564 bool* scp_assembly_required_p,
2565 Flag::Flags origin) {
2566 // Remaining part of option string
2567 const char* tail;
2568
2569 // iterate over arguments
2570 for (int index = 0; index < args->nOptions; index++) {
2571 bool is_absolute_path = false; // for -agentpath vs -agentlib
2572
2573 const JavaVMOption* option = args->options + index;
2574
2575 if (!match_option(option, "-Djava.class.path", &tail) &&
2576 !match_option(option, "-Dsun.java.command", &tail) &&
2577 !match_option(option, "-Dsun.java.launcher", &tail)) {
2578
2579 // add all jvm options to the jvm_args string. This string
2580 // is used later to set the java.vm.args PerfData string constant.
2581 // the -Djava.class.path and the -Dsun.java.command options are
2582 // omitted from jvm_args string as each have their own PerfData
2583 // string constant object.
2584 build_jvm_args(option->optionString);
2585 }
2586
2587 // -verbose:[class/gc/jni]
2588 if (match_option(option, "-verbose", &tail)) {
2589 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2590 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2591 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2592 } else if (!strcmp(tail, ":gc")) {
2593 FLAG_SET_CMDLINE(bool, PrintGC, true);
2594 } else if (!strcmp(tail, ":jni")) {
2595 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2596 }
2597 // -da / -ea / -disableassertions / -enableassertions
2598 // These accept an optional class/package name separated by a colon, e.g.,
2599 // -da:java.lang.Thread.
2600 } else if (match_option(option, user_assertion_options, &tail, true)) {
2601 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2602 if (*tail == '\0') {
2603 JavaAssertions::setUserClassDefault(enable);
2604 } else {
2605 assert(*tail == ':', "bogus match by match_option()");
2606 JavaAssertions::addOption(tail + 1, enable);
2607 }
2608 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2609 } else if (match_option(option, system_assertion_options, &tail, false)) {
2610 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2611 JavaAssertions::setSystemClassDefault(enable);
2612 // -bootclasspath:
2613 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2614 scp_p->reset_path(tail);
2615 *scp_assembly_required_p = true;
2616 // -bootclasspath/a:
2617 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2618 scp_p->add_suffix(tail);
2619 *scp_assembly_required_p = true;
2620 // -bootclasspath/p:
2621 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2622 scp_p->add_prefix(tail);
2623 *scp_assembly_required_p = true;
2624 // -Xrun
2625 } else if (match_option(option, "-Xrun", &tail)) {
2626 if (tail != NULL) {
2627 const char* pos = strchr(tail, ':');
2628 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2629 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2630 name[len] = '\0';
2631
2632 char *options = NULL;
2633 if(pos != NULL) {
2634 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2635 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2636 }
2637 #if !INCLUDE_JVMTI
2638 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2639 jio_fprintf(defaultStream::error_stream(),
2640 "Profiling and debugging agents are not supported in this VM\n");
2641 return JNI_ERR;
2642 }
2643 #endif // !INCLUDE_JVMTI
2644 add_init_library(name, options);
2645 }
2646 // -agentlib and -agentpath
2647 } else if (match_option(option, "-agentlib:", &tail) ||
2648 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2649 if(tail != NULL) {
2650 const char* pos = strchr(tail, '=');
2651 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2652 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2653 name[len] = '\0';
2654
2655 char *options = NULL;
2656 if(pos != NULL) {
2657 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2658 }
2659 #if !INCLUDE_JVMTI
2660 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2661 jio_fprintf(defaultStream::error_stream(),
2662 "Profiling and debugging agents are not supported in this VM\n");
2663 return JNI_ERR;
2664 }
2665 #endif // !INCLUDE_JVMTI
2666 add_init_agent(name, options, is_absolute_path);
2667 }
2668 // -javaagent
2669 } else if (match_option(option, "-javaagent:", &tail)) {
2670 #if !INCLUDE_JVMTI
2671 jio_fprintf(defaultStream::error_stream(),
2672 "Instrumentation agents are not supported in this VM\n");
2673 return JNI_ERR;
2674 #else
2675 if(tail != NULL) {
2676 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2677 add_init_agent("instrument", options, false);
2678 }
2679 #endif // !INCLUDE_JVMTI
2680 // -Xnoclassgc
2681 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2682 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2683 // -Xincgc: i-CMS
2684 } else if (match_option(option, "-Xincgc", &tail)) {
2685 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2686 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2687 // -Xnoincgc: no i-CMS
2688 } else if (match_option(option, "-Xnoincgc", &tail)) {
2689 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2690 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2691 // -Xconcgc
2692 } else if (match_option(option, "-Xconcgc", &tail)) {
2693 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2694 // -Xnoconcgc
2695 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2696 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2697 // -Xbatch
2698 } else if (match_option(option, "-Xbatch", &tail)) {
2699 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2700 // -Xmn for compatibility with other JVM vendors
2701 } else if (match_option(option, "-Xmn", &tail)) {
2702 julong long_initial_young_size = 0;
2703 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2704 if (errcode != arg_in_range) {
2705 jio_fprintf(defaultStream::error_stream(),
2706 "Invalid initial young generation size: %s\n", option->optionString);
2707 describe_range_error(errcode);
2708 return JNI_EINVAL;
2709 }
2710 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2711 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2712 // -Xms
2713 } else if (match_option(option, "-Xms", &tail)) {
2714 julong long_initial_heap_size = 0;
2715 // an initial heap size of 0 means automatically determine
2716 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2717 if (errcode != arg_in_range) {
2718 jio_fprintf(defaultStream::error_stream(),
2719 "Invalid initial heap size: %s\n", option->optionString);
2720 describe_range_error(errcode);
2721 return JNI_EINVAL;
2722 }
2723 set_min_heap_size((uintx)long_initial_heap_size);
2724 // Currently the minimum size and the initial heap sizes are the same.
2725 // Can be overridden with -XX:InitialHeapSize.
2726 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2727 // -Xmx
2728 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2729 julong long_max_heap_size = 0;
2730 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2731 if (errcode != arg_in_range) {
2732 jio_fprintf(defaultStream::error_stream(),
2733 "Invalid maximum heap size: %s\n", option->optionString);
2734 describe_range_error(errcode);
2735 return JNI_EINVAL;
2736 }
2737 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2738 // Xmaxf
2739 } else if (match_option(option, "-Xmaxf", &tail)) {
2740 char* err;
2741 int maxf = (int)(strtod(tail, &err) * 100);
2742 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2743 jio_fprintf(defaultStream::error_stream(),
2744 "Bad max heap free percentage size: %s\n",
2745 option->optionString);
2746 return JNI_EINVAL;
2747 } else {
2748 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2749 }
2750 // Xminf
2751 } else if (match_option(option, "-Xminf", &tail)) {
2752 char* err;
2753 int minf = (int)(strtod(tail, &err) * 100);
2754 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2755 jio_fprintf(defaultStream::error_stream(),
2756 "Bad min heap free percentage size: %s\n",
2757 option->optionString);
2758 return JNI_EINVAL;
2759 } else {
2760 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2761 }
2762 // -Xss
2763 } else if (match_option(option, "-Xss", &tail)) {
2764 julong long_ThreadStackSize = 0;
2765 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2766 if (errcode != arg_in_range) {
2767 jio_fprintf(defaultStream::error_stream(),
2768 "Invalid thread stack size: %s\n", option->optionString);
2769 describe_range_error(errcode);
2770 return JNI_EINVAL;
2771 }
2772 // Internally track ThreadStackSize in units of 1024 bytes.
2773 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2774 round_to((int)long_ThreadStackSize, K) / K);
2775 // -Xoss
2776 } else if (match_option(option, "-Xoss", &tail)) {
2777 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2778 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2779 julong long_CodeCacheExpansionSize = 0;
2780 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2781 if (errcode != arg_in_range) {
2782 jio_fprintf(defaultStream::error_stream(),
2783 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2784 os::vm_page_size()/K);
2785 return JNI_EINVAL;
2786 }
2787 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2788 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2789 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2790 julong long_ReservedCodeCacheSize = 0;
2791
2792 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2793 if (errcode != arg_in_range) {
2794 jio_fprintf(defaultStream::error_stream(),
2795 "Invalid maximum code cache size: %s.\n", option->optionString);
2796 return JNI_EINVAL;
2797 }
2798 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2799 //-XX:IncreaseFirstTierCompileThresholdAt=
2800 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2801 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2802 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2803 jio_fprintf(defaultStream::error_stream(),
2804 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2805 option->optionString);
2806 return JNI_EINVAL;
2807 }
2808 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2809 // -green
2810 } else if (match_option(option, "-green", &tail)) {
2811 jio_fprintf(defaultStream::error_stream(),
2812 "Green threads support not available\n");
2813 return JNI_EINVAL;
2814 // -native
2815 } else if (match_option(option, "-native", &tail)) {
2816 // HotSpot always uses native threads, ignore silently for compatibility
2817 // -Xsqnopause
2818 } else if (match_option(option, "-Xsqnopause", &tail)) {
2819 // EVM option, ignore silently for compatibility
2820 // -Xrs
2821 } else if (match_option(option, "-Xrs", &tail)) {
2822 // Classic/EVM option, new functionality
2823 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2824 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2825 // change default internal VM signals used - lower case for back compat
2826 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2827 // -Xoptimize
2828 } else if (match_option(option, "-Xoptimize", &tail)) {
2829 // EVM option, ignore silently for compatibility
2830 // -Xprof
2831 } else if (match_option(option, "-Xprof", &tail)) {
2832 #if INCLUDE_FPROF
2833 _has_profile = true;
2834 #else // INCLUDE_FPROF
2835 jio_fprintf(defaultStream::error_stream(),
2836 "Flat profiling is not supported in this VM.\n");
2837 return JNI_ERR;
2838 #endif // INCLUDE_FPROF
2839 // -Xconcurrentio
2840 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2841 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2842 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2843 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2844 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2845 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2846
2847 // -Xinternalversion
2848 } else if (match_option(option, "-Xinternalversion", &tail)) {
2849 jio_fprintf(defaultStream::output_stream(), "%s\n",
2850 VM_Version::internal_vm_info_string());
2851 vm_exit(0);
2852 #ifndef PRODUCT
2853 // -Xprintflags
2854 } else if (match_option(option, "-Xprintflags", &tail)) {
2855 CommandLineFlags::printFlags(tty, false);
2856 vm_exit(0);
2857 #endif
2858 // -D
2859 } else if (match_option(option, "-D", &tail)) {
2860 if (!add_property(tail)) {
2861 return JNI_ENOMEM;
2862 }
2863 // Out of the box management support
2864 if (match_option(option, "-Dcom.sun.management", &tail)) {
2865 #if INCLUDE_MANAGEMENT
2866 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2867 #else
2868 jio_fprintf(defaultStream::output_stream(),
2869 "-Dcom.sun.management is not supported in this VM.\n");
2870 return JNI_ERR;
2871 #endif
2872 }
2873 // -Xint
2874 } else if (match_option(option, "-Xint", &tail)) {
2875 set_mode_flags(_int);
2876 // -Xmixed
2877 } else if (match_option(option, "-Xmixed", &tail)) {
2878 set_mode_flags(_mixed);
2879 // -Xcomp
2880 } else if (match_option(option, "-Xcomp", &tail)) {
2881 // for testing the compiler; turn off all flags that inhibit compilation
2882 set_mode_flags(_comp);
2883 // -Xshare:dump
2884 } else if (match_option(option, "-Xshare:dump", &tail)) {
2885 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2886 set_mode_flags(_int); // Prevent compilation, which creates objects
2887 // -Xshare:on
2888 } else if (match_option(option, "-Xshare:on", &tail)) {
2889 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2890 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2891 // -Xshare:auto
2892 } else if (match_option(option, "-Xshare:auto", &tail)) {
2893 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2894 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2895 // -Xshare:off
2896 } else if (match_option(option, "-Xshare:off", &tail)) {
2897 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2898 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2899 // -Xverify
2900 } else if (match_option(option, "-Xverify", &tail)) {
2901 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2902 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2903 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2904 } else if (strcmp(tail, ":remote") == 0) {
2905 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2906 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2907 } else if (strcmp(tail, ":none") == 0) {
2908 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2909 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2910 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2911 return JNI_EINVAL;
2912 }
2913 // -Xdebug
2914 } else if (match_option(option, "-Xdebug", &tail)) {
2915 // note this flag has been used, then ignore
2916 set_xdebug_mode(true);
2917 // -Xnoagent
2918 } else if (match_option(option, "-Xnoagent", &tail)) {
2919 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2920 } else if (match_option(option, "-Xboundthreads", &tail)) {
2921 // Bind user level threads to kernel threads (Solaris only)
2922 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2923 } else if (match_option(option, "-Xloggc:", &tail)) {
2924 // Redirect GC output to the file. -Xloggc:<filename>
2925 // ostream_init_log(), when called will use this filename
2926 // to initialize a fileStream.
2927 _gc_log_filename = strdup(tail);
2928 if (!is_filename_valid(_gc_log_filename)) {
2929 jio_fprintf(defaultStream::output_stream(),
2930 "Invalid file name for use with -Xloggc: Filename can only contain the "
2931 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2932 "Note %%p or %%t can only be used once\n", _gc_log_filename);
2933 return JNI_EINVAL;
2934 }
2935 FLAG_SET_CMDLINE(bool, PrintGC, true);
2936 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2937
2938 // JNI hooks
2939 } else if (match_option(option, "-Xcheck", &tail)) {
2940 if (!strcmp(tail, ":jni")) {
2941 #if !INCLUDE_JNI_CHECK
2942 warning("JNI CHECKING is not supported in this VM");
2943 #else
2944 CheckJNICalls = true;
2945 #endif // INCLUDE_JNI_CHECK
2946 } else if (is_bad_option(option, args->ignoreUnrecognized,
2947 "check")) {
2948 return JNI_EINVAL;
2949 }
2950 } else if (match_option(option, "vfprintf", &tail)) {
2951 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2952 } else if (match_option(option, "exit", &tail)) {
2953 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2954 } else if (match_option(option, "abort", &tail)) {
2955 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2956 // -XX:+AggressiveHeap
2957 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2958
2959 // This option inspects the machine and attempts to set various
2960 // parameters to be optimal for long-running, memory allocation
2961 // intensive jobs. It is intended for machines with large
2962 // amounts of cpu and memory.
2963
2964 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2965 // VM, but we may not be able to represent the total physical memory
2966 // available (like having 8gb of memory on a box but using a 32bit VM).
2967 // Thus, we need to make sure we're using a julong for intermediate
2968 // calculations.
2969 julong initHeapSize;
2970 julong total_memory = os::physical_memory();
2971
2972 if (total_memory < (julong)256*M) {
2973 jio_fprintf(defaultStream::error_stream(),
2974 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2975 vm_exit(1);
2976 }
2977
2978 // The heap size is half of available memory, or (at most)
2979 // all of possible memory less 160mb (leaving room for the OS
2980 // when using ISM). This is the maximum; because adaptive sizing
2981 // is turned on below, the actual space used may be smaller.
2982
2983 initHeapSize = MIN2(total_memory / (julong)2,
2984 total_memory - (julong)160*M);
2985
2986 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2987
2988 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2989 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2990 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2991 // Currently the minimum size and the initial heap sizes are the same.
2992 set_min_heap_size(initHeapSize);
2993 }
2994 if (FLAG_IS_DEFAULT(NewSize)) {
2995 // Make the young generation 3/8ths of the total heap.
2996 FLAG_SET_CMDLINE(uintx, NewSize,
2997 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2998 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2999 }
3000
3001 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3002 FLAG_SET_DEFAULT(UseLargePages, true);
3003 #endif
3004
3005 // Increase some data structure sizes for efficiency
3006 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3007 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3008 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3009
3010 // See the OldPLABSize comment below, but replace 'after promotion'
3011 // with 'after copying'. YoungPLABSize is the size of the survivor
3012 // space per-gc-thread buffers. The default is 4kw.
3013 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3014
3015 // OldPLABSize is the size of the buffers in the old gen that
3016 // UseParallelGC uses to promote live data that doesn't fit in the
3017 // survivor spaces. At any given time, there's one for each gc thread.
3018 // The default size is 1kw. These buffers are rarely used, since the
3019 // survivor spaces are usually big enough. For specjbb, however, there
3020 // are occasions when there's lots of live data in the young gen
3021 // and we end up promoting some of it. We don't have a definite
3022 // explanation for why bumping OldPLABSize helps, but the theory
3023 // is that a bigger PLAB results in retaining something like the
3024 // original allocation order after promotion, which improves mutator
3025 // locality. A minor effect may be that larger PLABs reduce the
3026 // number of PLAB allocation events during gc. The value of 8kw
3027 // was arrived at by experimenting with specjbb.
3028 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3029
3030 // Enable parallel GC and adaptive generation sizing
3031 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3032 FLAG_SET_DEFAULT(ParallelGCThreads,
3033 Abstract_VM_Version::parallel_worker_threads());
3034
3035 // Encourage steady state memory management
3036 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3037
3038 // This appears to improve mutator locality
3039 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3040
3041 // Get around early Solaris scheduling bug
3042 // (affinity vs other jobs on system)
3043 // but disallow DR and offlining (5008695).
3044 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3045
3046 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3047 // The last option must always win.
3048 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3049 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3050 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3051 // The last option must always win.
3052 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3053 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3054 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3055 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3056 jio_fprintf(defaultStream::error_stream(),
3057 "Please use CMSClassUnloadingEnabled in place of "
3058 "CMSPermGenSweepingEnabled in the future\n");
3059 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3060 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3061 jio_fprintf(defaultStream::error_stream(),
3062 "Please use -XX:+UseGCOverheadLimit in place of "
3063 "-XX:+UseGCTimeLimit in the future\n");
3064 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3065 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3066 jio_fprintf(defaultStream::error_stream(),
3067 "Please use -XX:-UseGCOverheadLimit in place of "
3068 "-XX:-UseGCTimeLimit in the future\n");
3069 // The TLE options are for compatibility with 1.3 and will be
3070 // removed without notice in a future release. These options
3071 // are not to be documented.
3072 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3073 // No longer used.
3074 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3075 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3076 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3077 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3078 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3079 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3080 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3081 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3082 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3083 // No longer used.
3084 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3085 julong long_tlab_size = 0;
3086 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3087 if (errcode != arg_in_range) {
3088 jio_fprintf(defaultStream::error_stream(),
3089 "Invalid TLAB size: %s\n", option->optionString);
3090 describe_range_error(errcode);
3091 return JNI_EINVAL;
3092 }
3093 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3094 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3095 // No longer used.
3096 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3097 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3098 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3099 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3100 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3101 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3102 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3103 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3104 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3105 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3106 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3107 #if defined(DTRACE_ENABLED)
3108 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3109 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3110 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3111 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3112 #else // defined(DTRACE_ENABLED)
3113 jio_fprintf(defaultStream::error_stream(),
3114 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3115 return JNI_EINVAL;
3116 #endif // defined(DTRACE_ENABLED)
3117 #ifdef ASSERT
3118 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3119 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3120 // disable scavenge before parallel mark-compact
3121 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3122 #endif
3123 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3124 julong cms_blocks_to_claim = (julong)atol(tail);
3125 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3126 jio_fprintf(defaultStream::error_stream(),
3127 "Please use -XX:OldPLABSize in place of "
3128 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3129 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3130 julong cms_blocks_to_claim = (julong)atol(tail);
3131 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3132 jio_fprintf(defaultStream::error_stream(),
3133 "Please use -XX:OldPLABSize in place of "
3134 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3135 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3136 julong old_plab_size = 0;
3137 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3138 if (errcode != arg_in_range) {
3139 jio_fprintf(defaultStream::error_stream(),
3140 "Invalid old PLAB size: %s\n", option->optionString);
3141 describe_range_error(errcode);
3142 return JNI_EINVAL;
3143 }
3144 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3145 jio_fprintf(defaultStream::error_stream(),
3146 "Please use -XX:OldPLABSize in place of "
3147 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3148 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3149 julong young_plab_size = 0;
3150 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3151 if (errcode != arg_in_range) {
3152 jio_fprintf(defaultStream::error_stream(),
3153 "Invalid young PLAB size: %s\n", option->optionString);
3154 describe_range_error(errcode);
3155 return JNI_EINVAL;
3156 }
3157 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3158 jio_fprintf(defaultStream::error_stream(),
3159 "Please use -XX:YoungPLABSize in place of "
3160 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3161 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3162 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3163 julong stack_size = 0;
3164 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3165 if (errcode != arg_in_range) {
3166 jio_fprintf(defaultStream::error_stream(),
3167 "Invalid mark stack size: %s\n", option->optionString);
3168 describe_range_error(errcode);
3169 return JNI_EINVAL;
3170 }
3171 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3172 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3173 julong max_stack_size = 0;
3174 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3175 if (errcode != arg_in_range) {
3176 jio_fprintf(defaultStream::error_stream(),
3177 "Invalid maximum mark stack size: %s\n",
3178 option->optionString);
3179 describe_range_error(errcode);
3180 return JNI_EINVAL;
3181 }
3182 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3183 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3184 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3185 uintx conc_threads = 0;
3186 if (!parse_uintx(tail, &conc_threads, 1)) {
3187 jio_fprintf(defaultStream::error_stream(),
3188 "Invalid concurrent threads: %s\n", option->optionString);
3189 return JNI_EINVAL;
3190 }
3191 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3192 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3193 julong max_direct_memory_size = 0;
3194 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3195 if (errcode != arg_in_range) {
3196 jio_fprintf(defaultStream::error_stream(),
3197 "Invalid maximum direct memory size: %s\n",
3198 option->optionString);
3199 describe_range_error(errcode);
3200 return JNI_EINVAL;
3201 }
3202 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3203 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3204 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3205 // away and will cause VM initialization failures!
3206 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3207 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3208 #if !INCLUDE_MANAGEMENT
3209 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3210 jio_fprintf(defaultStream::error_stream(),
3211 "ManagementServer is not supported in this VM.\n");
3212 return JNI_ERR;
3213 #endif // INCLUDE_MANAGEMENT
3214 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3215 // Skip -XX:Flags= since that case has already been handled
3216 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3217 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3218 return JNI_EINVAL;
3219 }
3220 }
3221 // Unknown option
3222 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3223 return JNI_ERR;
3224 }
3225 }
3226
3227 // Change the default value for flags which have different default values
3228 // when working with older JDKs.
3229 #ifdef LINUX
3230 if (JDK_Version::current().compare_major(6) <= 0 &&
3231 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3232 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3233 }
3234 #endif // LINUX
3235 return JNI_OK;
3236 }
3237
3238 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3239 // This must be done after all -D arguments have been processed.
3240 scp_p->expand_endorsed();
3241
3242 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3243 // Assemble the bootclasspath elements into the final path.
3244 Arguments::set_sysclasspath(scp_p->combined_path());
3245 }
3246
3247 // This must be done after all arguments have been processed.
3248 // java_compiler() true means set to "NONE" or empty.
3249 if (java_compiler() && !xdebug_mode()) {
3250 // For backwards compatibility, we switch to interpreted mode if
3251 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3252 // not specified.
3253 set_mode_flags(_int);
3254 }
3255 if (CompileThreshold == 0) {
3256 set_mode_flags(_int);
3257 }
3258
3259 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3260 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3261 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3262 }
3263
3264 #ifndef COMPILER2
3265 // Don't degrade server performance for footprint
3266 if (FLAG_IS_DEFAULT(UseLargePages) &&
3267 MaxHeapSize < LargePageHeapSizeThreshold) {
3268 // No need for large granularity pages w/small heaps.
3269 // Note that large pages are enabled/disabled for both the
3270 // Java heap and the code cache.
3271 FLAG_SET_DEFAULT(UseLargePages, false);
3272 }
3273
3274 #else
3275 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3276 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3277 }
3278 #endif
3279
3280 #ifndef TIERED
3281 // Tiered compilation is undefined.
3282 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3283 #endif
3284
3285 // If we are running in a headless jre, force java.awt.headless property
3286 // to be true unless the property has already been set.
3287 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3288 if (os::is_headless_jre()) {
3289 const char* headless = Arguments::get_property("java.awt.headless");
3290 if (headless == NULL) {
3291 char envbuffer[128];
3292 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3293 if (!add_property("java.awt.headless=true")) {
3294 return JNI_ENOMEM;
3295 }
3296 } else {
3297 char buffer[256];
3298 strcpy(buffer, "java.awt.headless=");
3299 strcat(buffer, envbuffer);
3300 if (!add_property(buffer)) {
3301 return JNI_ENOMEM;
3302 }
3303 }
3304 }
3305 }
3306
3307 if (!check_vm_args_consistency()) {
3308 return JNI_ERR;
3309 }
3310
3311 return JNI_OK;
3312 }
3313
3314 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3315 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3316 scp_assembly_required_p);
3317 }
3318
3319 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3320 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3321 scp_assembly_required_p);
3322 }
3323
3324 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3325 const int N_MAX_OPTIONS = 64;
3326 const int OPTION_BUFFER_SIZE = 1024;
3327 char buffer[OPTION_BUFFER_SIZE];
3328
3329 // The variable will be ignored if it exceeds the length of the buffer.
3330 // Don't check this variable if user has special privileges
3331 // (e.g. unix su command).
3332 if (os::getenv(name, buffer, sizeof(buffer)) &&
3333 !os::have_special_privileges()) {
3334 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3335 jio_fprintf(defaultStream::error_stream(),
3336 "Picked up %s: %s\n", name, buffer);
3337 char* rd = buffer; // pointer to the input string (rd)
3338 int i;
3339 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3340 while (isspace(*rd)) rd++; // skip whitespace
3341 if (*rd == 0) break; // we re done when the input string is read completely
3342
3343 // The output, option string, overwrites the input string.
3344 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3345 // input string (rd).
3346 char* wrt = rd;
3347
3348 options[i++].optionString = wrt; // Fill in option
3349 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3350 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3351 int quote = *rd; // matching quote to look for
3352 rd++; // don't copy open quote
3353 while (*rd != quote) { // include everything (even spaces) up until quote
3354 if (*rd == 0) { // string termination means unmatched string
3355 jio_fprintf(defaultStream::error_stream(),
3356 "Unmatched quote in %s\n", name);
3357 return JNI_ERR;
3358 }
3359 *wrt++ = *rd++; // copy to option string
3360 }
3361 rd++; // don't copy close quote
3362 } else {
3363 *wrt++ = *rd++; // copy to option string
3364 }
3365 }
3366 // Need to check if we're done before writing a NULL,
3367 // because the write could be to the byte that rd is pointing to.
3368 if (*rd++ == 0) {
3369 *wrt = 0;
3370 break;
3371 }
3372 *wrt = 0; // Zero terminate option
3373 }
3374 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3375 JavaVMInitArgs vm_args;
3376 vm_args.version = JNI_VERSION_1_2;
3377 vm_args.options = options;
3378 vm_args.nOptions = i;
3379 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3380
3381 if (PrintVMOptions) {
3382 const char* tail;
3383 for (int i = 0; i < vm_args.nOptions; i++) {
3384 const JavaVMOption *option = vm_args.options + i;
3385 if (match_option(option, "-XX:", &tail)) {
3386 logOption(tail);
3387 }
3388 }
3389 }
3390
3391 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3392 }
3393 return JNI_OK;
3394 }
3395
3396 void Arguments::set_shared_spaces_flags() {
3397 if (DumpSharedSpaces) {
3398 if (RequireSharedSpaces) {
3399 warning("cannot dump shared archive while using shared archive");
3400 }
3401 UseSharedSpaces = false;
3402 #ifdef _LP64
3403 if (!UseCompressedOops || !UseCompressedClassPointers) {
3404 vm_exit_during_initialization(
3405 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3406 }
3407 } else {
3408 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.
3409 if (!UseCompressedOops || !UseCompressedClassPointers) {
3410 no_shared_spaces();
3411 }
3412 #endif
3413 }
3414 }
3415
3416 #if !INCLUDE_ALL_GCS
3417 static void force_serial_gc() {
3418 FLAG_SET_DEFAULT(UseSerialGC, true);
3419 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3420 UNSUPPORTED_GC_OPTION(UseG1GC);
3421 UNSUPPORTED_GC_OPTION(UseParallelGC);
3422 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3423 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3424 UNSUPPORTED_GC_OPTION(UseParNewGC);
3425 }
3426 #endif // INCLUDE_ALL_GCS
3427
3428 // Sharing support
3429 // Construct the path to the archive
3430 static char* get_shared_archive_path() {
3431 char *shared_archive_path;
3432 if (SharedArchiveFile == NULL) {
3433 char jvm_path[JVM_MAXPATHLEN];
3434 os::jvm_path(jvm_path, sizeof(jvm_path));
3435 char *end = strrchr(jvm_path, *os::file_separator());
3436 if (end != NULL) *end = '\0';
3437 size_t jvm_path_len = strlen(jvm_path);
3438 size_t file_sep_len = strlen(os::file_separator());
3439 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3440 file_sep_len + 20, mtInternal);
3441 if (shared_archive_path != NULL) {
3442 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3443 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3444 strncat(shared_archive_path, "classes.jsa", 11);
3445 }
3446 } else {
3447 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3448 if (shared_archive_path != NULL) {
3449 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3450 }
3451 }
3452 return shared_archive_path;
3453 }
3454
3455 #ifndef PRODUCT
3456 // Determine whether LogVMOutput should be implicitly turned on.
3457 static bool use_vm_log() {
3458 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3459 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3460 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3461 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3462 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3463 return true;
3464 }
3465
3466 #ifdef COMPILER1
3467 if (PrintC1Statistics) {
3468 return true;
3469 }
3470 #endif // COMPILER1
3471
3472 #ifdef COMPILER2
3473 if (PrintOptoAssembly || PrintOptoStatistics) {
3474 return true;
3475 }
3476 #endif // COMPILER2
3477
3478 return false;
3479 }
3480 #endif // PRODUCT
3481
3482 // Parse entry point called from JNI_CreateJavaVM
3483
3484 jint Arguments::parse(const JavaVMInitArgs* args) {
3485
3486 // Remaining part of option string
3487 const char* tail;
3488
3489 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3490 const char* hotspotrc = ".hotspotrc";
3491 bool settings_file_specified = false;
3492 bool needs_hotspotrc_warning = false;
3493
3494 const char* flags_file;
3495 int index;
3496 for (index = 0; index < args->nOptions; index++) {
3497 const JavaVMOption *option = args->options + index;
3498 if (match_option(option, "-XX:Flags=", &tail)) {
3499 flags_file = tail;
3500 settings_file_specified = true;
3501 }
3502 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3503 PrintVMOptions = true;
3504 }
3505 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3506 PrintVMOptions = false;
3507 }
3508 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3509 IgnoreUnrecognizedVMOptions = true;
3510 }
3511 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3512 IgnoreUnrecognizedVMOptions = false;
3513 }
3514 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3515 CommandLineFlags::printFlags(tty, false);
3516 vm_exit(0);
3517 }
3518 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3519 #if INCLUDE_NMT
3520 MemTracker::init_tracking_options(tail);
3521 #else
3522 jio_fprintf(defaultStream::error_stream(),
3523 "Native Memory Tracking is not supported in this VM\n");
3524 return JNI_ERR;
3525 #endif
3526 }
3527
3528
3529 #ifndef PRODUCT
3530 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3531 CommandLineFlags::printFlags(tty, true);
3532 vm_exit(0);
3533 }
3534 #endif
3535 }
3536
3537 if (IgnoreUnrecognizedVMOptions) {
3538 // uncast const to modify the flag args->ignoreUnrecognized
3539 *(jboolean*)(&args->ignoreUnrecognized) = true;
3540 }
3541
3542 // Parse specified settings file
3543 if (settings_file_specified) {
3544 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3545 return JNI_EINVAL;
3546 }
3547 } else {
3548 #ifdef ASSERT
3549 // Parse default .hotspotrc settings file
3550 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3551 return JNI_EINVAL;
3552 }
3553 #else
3554 struct stat buf;
3555 if (os::stat(hotspotrc, &buf) == 0) {
3556 needs_hotspotrc_warning = true;
3557 }
3558 #endif
3559 }
3560
3561 if (PrintVMOptions) {
3562 for (index = 0; index < args->nOptions; index++) {
3563 const JavaVMOption *option = args->options + index;
3564 if (match_option(option, "-XX:", &tail)) {
3565 logOption(tail);
3566 }
3567 }
3568 }
3569
3570 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3571 jint result = parse_vm_init_args(args);
3572 if (result != JNI_OK) {
3573 return result;
3574 }
3575
3576 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3577 SharedArchivePath = get_shared_archive_path();
3578 if (SharedArchivePath == NULL) {
3579 return JNI_ENOMEM;
3580 }
3581
3582 // Delay warning until here so that we've had a chance to process
3583 // the -XX:-PrintWarnings flag
3584 if (needs_hotspotrc_warning) {
3585 warning("%s file is present but has been ignored. "
3586 "Run with -XX:Flags=%s to load the file.",
3587 hotspotrc, hotspotrc);
3588 }
3589
3590 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3591 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3592 #endif
3593
3594 #if INCLUDE_ALL_GCS
3595 #if (defined JAVASE_EMBEDDED || defined ARM)
3596 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3597 #endif
3598 #endif
3599
3600 #ifndef PRODUCT
3601 if (TraceBytecodesAt != 0) {
3602 TraceBytecodes = true;
3603 }
3604 if (CountCompiledCalls) {
3605 if (UseCounterDecay) {
3606 warning("UseCounterDecay disabled because CountCalls is set");
3607 UseCounterDecay = false;
3608 }
3609 }
3610 #endif // PRODUCT
3611
3612 // JSR 292 is not supported before 1.7
3613 if (!JDK_Version::is_gte_jdk17x_version()) {
3614 if (EnableInvokeDynamic) {
3615 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3616 warning("JSR 292 is not supported before 1.7. Disabling support.");
3617 }
3618 EnableInvokeDynamic = false;
3619 }
3620 }
3621
3622 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3623 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3624 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3625 }
3626 ScavengeRootsInCode = 1;
3627 }
3628
3629 if (PrintGCDetails) {
3630 // Turn on -verbose:gc options as well
3631 PrintGC = true;
3632 }
3633
3634 if (!JDK_Version::is_gte_jdk18x_version()) {
3635 // To avoid changing the log format for 7 updates this flag is only
3636 // true by default in JDK8 and above.
3637 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3638 FLAG_SET_DEFAULT(PrintGCCause, false);
3639 }
3640 }
3641
3642 // Set object alignment values.
3643 set_object_alignment();
3644
3645 #if !INCLUDE_ALL_GCS
3646 force_serial_gc();
3647 #endif // INCLUDE_ALL_GCS
3648 #if !INCLUDE_CDS
3649 if (DumpSharedSpaces || RequireSharedSpaces) {
3650 jio_fprintf(defaultStream::error_stream(),
3651 "Shared spaces are not supported in this VM\n");
3652 return JNI_ERR;
3653 }
3654 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3655 warning("Shared spaces are not supported in this VM");
3656 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3657 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3658 }
3659 no_shared_spaces();
3660 #endif // INCLUDE_CDS
3661
3662 return JNI_OK;
3663 }
3664
3665 jint Arguments::apply_ergo() {
3666
3667 // Set flags based on ergonomics.
3668 set_ergonomics_flags();
3669
3670 set_shared_spaces_flags();
3671
3672 // Check the GC selections again.
3673 if (!check_gc_consistency()) {
3674 return JNI_EINVAL;
3675 }
3676
3677 if (TieredCompilation) {
3678 set_tiered_flags();
3679 } else {
3680 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3681 if (CompilationPolicyChoice >= 2) {
3682 vm_exit_during_initialization(
3683 "Incompatible compilation policy selected", NULL);
3684 }
3685 }
3686 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
3687 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3688 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
3689 }
3690
3691
3692 // Set heap size based on available physical memory
3693 set_heap_size();
3694
3695 #if INCLUDE_ALL_GCS
3696 // Set per-collector flags
3697 if (UseParallelGC || UseParallelOldGC) {
3698 set_parallel_gc_flags();
3699 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
3700 set_cms_and_parnew_gc_flags();
3701 } else if (UseParNewGC) { // Skipped if CMS is set above
3702 set_parnew_gc_flags();
3703 } else if (UseG1GC) {
3704 set_g1_gc_flags();
3705 }
3706 check_deprecated_gcs();
3707 check_deprecated_gc_flags();
3708 if (AssumeMP && !UseSerialGC) {
3709 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3710 warning("If the number of processors is expected to increase from one, then"
3711 " you should configure the number of parallel GC threads appropriately"
3712 " using -XX:ParallelGCThreads=N");
3713 }
3714 }
3715 if (MinHeapFreeRatio == 100) {
3716 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
3717 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
3718 }
3719 #else // INCLUDE_ALL_GCS
3720 assert(verify_serial_gc_flags(), "SerialGC unset");
3721 #endif // INCLUDE_ALL_GCS
3722
3723 // Initialize Metaspace flags and alignments.
3724 Metaspace::ergo_initialize();
3725
3726 // Set bytecode rewriting flags
3727 set_bytecode_flags();
3728
3729 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3730 set_aggressive_opts_flags();
3731
3732 // Turn off biased locking for locking debug mode flags,
3733 // which are subtlely different from each other but neither works with
3734 // biased locking.
3735 if (UseHeavyMonitors
3736 #ifdef COMPILER1
3737 || !UseFastLocking
3738 #endif // COMPILER1
3739 ) {
3740 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3741 // flag set to true on command line; warn the user that they
3742 // can't enable biased locking here
3743 warning("Biased Locking is not supported with locking debug flags"
3744 "; ignoring UseBiasedLocking flag." );
3745 }
3746 UseBiasedLocking = false;
3747 }
3748
3749 #ifdef ZERO
3750 // Clear flags not supported on zero.
3751 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3752 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3753 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3754 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3755 #endif // CC_INTERP
3756
3757 #ifdef COMPILER2
3758 if (!EliminateLocks) {
3759 EliminateNestedLocks = false;
3760 }
3761 if (!Inline) {
3762 IncrementalInline = false;
3763 }
3764 #ifndef PRODUCT
3765 if (!IncrementalInline) {
3766 AlwaysIncrementalInline = false;
3767 }
3768 #endif
3769 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3770 // incremental inlining: bump MaxNodeLimit
3771 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3772 }
3773 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3774 // nothing to use the profiling, turn if off
3775 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3776 }
3777 if (UseTypeSpeculation && FLAG_IS_DEFAULT(ReplaceInParentMaps)) {
3778 // Doing the replace in parent maps helps speculation
3779 FLAG_SET_DEFAULT(ReplaceInParentMaps, true);
3780 }
3781 #endif
3782
3783 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3784 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3785 DebugNonSafepoints = true;
3786 }
3787
3788 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3789 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3790 }
3791
3792 #ifndef PRODUCT
3793 if (CompileTheWorld) {
3794 // Force NmethodSweeper to sweep whole CodeCache each time.
3795 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3796 NmethodSweepFraction = 1;
3797 }
3798 }
3799
3800 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3801 if (use_vm_log()) {
3802 LogVMOutput = true;
3803 }
3804 }
3805 #endif // PRODUCT
3806
3807 if (PrintCommandLineFlags) {
3808 CommandLineFlags::printSetFlags(tty);
3809 }
3810
3811 // Apply CPU specific policy for the BiasedLocking
3812 if (UseBiasedLocking) {
3813 if (!VM_Version::use_biased_locking() &&
3814 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3815 UseBiasedLocking = false;
3816 }
3817 }
3818 #ifdef COMPILER2
3819 if (!UseBiasedLocking || EmitSync != 0) {
3820 UseOptoBiasInlining = false;
3821 }
3822 #endif
3823
3824 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3825 // but only if not already set on the commandline
3826 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3827 bool set = false;
3828 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3829 if (!set) {
3830 FLAG_SET_DEFAULT(PauseAtExit, true);
3831 }
3832 }
3833
3834 return JNI_OK;
3835 }
3836
3837 jint Arguments::adjust_after_os() {
3838 #if INCLUDE_ALL_GCS
3839 if (UseParallelGC || UseParallelOldGC) {
3840 if (UseNUMA) {
3841 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3842 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3843 }
3844 // For those collectors or operating systems (eg, Windows) that do
3845 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3846 UseNUMAInterleaving = true;
3847 }
3848 }
3849 #endif // INCLUDE_ALL_GCS
3850 return JNI_OK;
3851 }
3852
3853 int Arguments::PropertyList_count(SystemProperty* pl) {
3854 int count = 0;
3855 while(pl != NULL) {
3856 count++;
3857 pl = pl->next();
3858 }
3859 return count;
3860 }
3861
3862 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3863 assert(key != NULL, "just checking");
3864 SystemProperty* prop;
3865 for (prop = pl; prop != NULL; prop = prop->next()) {
3866 if (strcmp(key, prop->key()) == 0) return prop->value();
3867 }
3868 return NULL;
3869 }
3870
3871 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3872 int count = 0;
3873 const char* ret_val = NULL;
3874
3875 while(pl != NULL) {
3876 if(count >= index) {
3877 ret_val = pl->key();
3878 break;
3879 }
3880 count++;
3881 pl = pl->next();
3882 }
3883
3884 return ret_val;
3885 }
3886
3887 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3888 int count = 0;
3889 char* ret_val = NULL;
3890
3891 while(pl != NULL) {
3892 if(count >= index) {
3893 ret_val = pl->value();
3894 break;
3895 }
3896 count++;
3897 pl = pl->next();
3898 }
3899
3900 return ret_val;
3901 }
3902
3903 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3904 SystemProperty* p = *plist;
3905 if (p == NULL) {
3906 *plist = new_p;
3907 } else {
3908 while (p->next() != NULL) {
3909 p = p->next();
3910 }
3911 p->set_next(new_p);
3912 }
3913 }
3914
3915 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3916 if (plist == NULL)
3917 return;
3918
3919 SystemProperty* new_p = new SystemProperty(k, v, true);
3920 PropertyList_add(plist, new_p);
3921 }
3922
3923 // This add maintains unique property key in the list.
3924 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3925 if (plist == NULL)
3926 return;
3927
3928 // If property key exist then update with new value.
3929 SystemProperty* prop;
3930 for (prop = *plist; prop != NULL; prop = prop->next()) {
3931 if (strcmp(k, prop->key()) == 0) {
3932 if (append) {
3933 prop->append_value(v);
3934 } else {
3935 prop->set_value(v);
3936 }
3937 return;
3938 }
3939 }
3940
3941 PropertyList_add(plist, k, v);
3942 }
3943
3944 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3945 // Returns true if all of the source pointed by src has been copied over to
3946 // the destination buffer pointed by buf. Otherwise, returns false.
3947 // Notes:
3948 // 1. If the length (buflen) of the destination buffer excluding the
3949 // NULL terminator character is not long enough for holding the expanded
3950 // pid characters, it also returns false instead of returning the partially
3951 // expanded one.
3952 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3953 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3954 char* buf, size_t buflen) {
3955 const char* p = src;
3956 char* b = buf;
3957 const char* src_end = &src[srclen];
3958 char* buf_end = &buf[buflen - 1];
3959
3960 while (p < src_end && b < buf_end) {
3961 if (*p == '%') {
3962 switch (*(++p)) {
3963 case '%': // "%%" ==> "%"
3964 *b++ = *p++;
3965 break;
3966 case 'p': { // "%p" ==> current process id
3967 // buf_end points to the character before the last character so
3968 // that we could write '\0' to the end of the buffer.
3969 size_t buf_sz = buf_end - b + 1;
3970 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3971
3972 // if jio_snprintf fails or the buffer is not long enough to hold
3973 // the expanded pid, returns false.
3974 if (ret < 0 || ret >= (int)buf_sz) {
3975 return false;
3976 } else {
3977 b += ret;
3978 assert(*b == '\0', "fail in copy_expand_pid");
3979 if (p == src_end && b == buf_end + 1) {
3980 // reach the end of the buffer.
3981 return true;
3982 }
3983 }
3984 p++;
3985 break;
3986 }
3987 default :
3988 *b++ = '%';
3989 }
3990 } else {
3991 *b++ = *p++;
3992 }
3993 }
3994 *b = '\0';
3995 return (p == src_end); // return false if not all of the source was copied
3996 }
--- EOF ---