1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaAssertions.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "compiler/compilerOracle.hpp"
29 #include "memory/allocation.inline.hpp"
30 #include "memory/cardTableRS.hpp"
31 #include "memory/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->print_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->print_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);
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 if (FLAG_IS_DEFAULT(CodeCacheSegmentSize) && FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1132 // There is enough code cache available. Increasing CodeCacheSegmentSize results
1133 // in less memory fragmentation (and therefore a shorter freelist in the code heap.)
1134 // Testing shows a reduction of the freelist length by several factors compared to
1135 // using the default CodeCacheSegmentSize. A larger CodeCacheSegmentSize increases
1136 // the memory consumption (due to possibly unused memory at the end of an nmethod)
1137 // by a couple of percent only.
1138 FLAG_SET_DEFAULT(CodeCacheSegmentSize, CodeCacheSegmentSize * 2);
1139 }
1140 // Increase the code cache size - tiered compiles a lot more.
1141 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1142 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1143 }
1144 if (!UseInterpreter) { // -Xcomp
1145 Tier3InvokeNotifyFreqLog = 0;
1146 Tier4InvocationThreshold = 0;
1147 }
1148 }
1149
1150 #if INCLUDE_ALL_GCS
1151 static void disable_adaptive_size_policy(const char* collector_name) {
1152 if (UseAdaptiveSizePolicy) {
1153 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1154 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1155 collector_name);
1156 }
1157 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1158 }
1159 }
1160
1161 void Arguments::set_parnew_gc_flags() {
1162 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1163 "control point invariant");
1164 assert(UseParNewGC, "Error");
1165
1166 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1167 disable_adaptive_size_policy("UseParNewGC");
1168
1169 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1170 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1171 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1172 } else if (ParallelGCThreads == 0) {
1173 jio_fprintf(defaultStream::error_stream(),
1174 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1175 vm_exit(1);
1176 }
1177
1178 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1179 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1180 // we set them to 1024 and 1024.
1181 // See CR 6362902.
1182 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1183 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1184 }
1185 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1186 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1187 }
1188
1189 // AlwaysTenure flag should make ParNew promote all at first collection.
1190 // See CR 6362902.
1191 if (AlwaysTenure) {
1192 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1193 }
1194 // When using compressed oops, we use local overflow stacks,
1195 // rather than using a global overflow list chained through
1196 // the klass word of the object's pre-image.
1197 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1198 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1199 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1200 }
1201 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1202 }
1203 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1204 }
1205
1206 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1207 // sparc/solaris for certain applications, but would gain from
1208 // further optimization and tuning efforts, and would almost
1209 // certainly gain from analysis of platform and environment.
1210 void Arguments::set_cms_and_parnew_gc_flags() {
1211 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1212 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1213
1214 // If we are using CMS, we prefer to UseParNewGC,
1215 // unless explicitly forbidden.
1216 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1217 FLAG_SET_ERGO(bool, UseParNewGC, true);
1218 }
1219
1220 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1221 disable_adaptive_size_policy("UseConcMarkSweepGC");
1222
1223 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1224 // as needed.
1225 if (UseParNewGC) {
1226 set_parnew_gc_flags();
1227 }
1228
1229 size_t max_heap = align_size_down(MaxHeapSize,
1230 CardTableRS::ct_max_alignment_constraint());
1231
1232 // Now make adjustments for CMS
1233 intx tenuring_default = (intx)6;
1234 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1235
1236 // Preferred young gen size for "short" pauses:
1237 // upper bound depends on # of threads and NewRatio.
1238 const uintx parallel_gc_threads =
1239 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1240 const size_t preferred_max_new_size_unaligned =
1241 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1242 size_t preferred_max_new_size =
1243 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1244
1245 // Unless explicitly requested otherwise, size young gen
1246 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1247
1248 // If either MaxNewSize or NewRatio is set on the command line,
1249 // assume the user is trying to set the size of the young gen.
1250 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1251
1252 // Set MaxNewSize to our calculated preferred_max_new_size unless
1253 // NewSize was set on the command line and it is larger than
1254 // preferred_max_new_size.
1255 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1256 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1257 } else {
1258 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1259 }
1260 if (PrintGCDetails && Verbose) {
1261 // Too early to use gclog_or_tty
1262 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1263 }
1264
1265 // Code along this path potentially sets NewSize and OldSize
1266 if (PrintGCDetails && Verbose) {
1267 // Too early to use gclog_or_tty
1268 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1269 " initial_heap_size: " SIZE_FORMAT
1270 " max_heap: " SIZE_FORMAT,
1271 min_heap_size(), InitialHeapSize, max_heap);
1272 }
1273 size_t min_new = preferred_max_new_size;
1274 if (FLAG_IS_CMDLINE(NewSize)) {
1275 min_new = NewSize;
1276 }
1277 if (max_heap > min_new && min_heap_size() > min_new) {
1278 // Unless explicitly requested otherwise, make young gen
1279 // at least min_new, and at most preferred_max_new_size.
1280 if (FLAG_IS_DEFAULT(NewSize)) {
1281 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1282 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1283 if (PrintGCDetails && Verbose) {
1284 // Too early to use gclog_or_tty
1285 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1286 }
1287 }
1288 // Unless explicitly requested otherwise, size old gen
1289 // so it's NewRatio x of NewSize.
1290 if (FLAG_IS_DEFAULT(OldSize)) {
1291 if (max_heap > NewSize) {
1292 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1293 if (PrintGCDetails && Verbose) {
1294 // Too early to use gclog_or_tty
1295 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1296 }
1297 }
1298 }
1299 }
1300 }
1301 // Unless explicitly requested otherwise, definitely
1302 // promote all objects surviving "tenuring_default" scavenges.
1303 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1304 FLAG_IS_DEFAULT(SurvivorRatio)) {
1305 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1306 }
1307 // If we decided above (or user explicitly requested)
1308 // `promote all' (via MaxTenuringThreshold := 0),
1309 // prefer minuscule survivor spaces so as not to waste
1310 // space for (non-existent) survivors
1311 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1312 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1313 }
1314 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1315 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1316 // This is done in order to make ParNew+CMS configuration to work
1317 // with YoungPLABSize and OldPLABSize options.
1318 // See CR 6362902.
1319 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1320 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1321 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1322 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1323 // the value (either from the command line or ergonomics) of
1324 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1325 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1326 } else {
1327 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1328 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1329 // we'll let it to take precedence.
1330 jio_fprintf(defaultStream::error_stream(),
1331 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1332 " options are specified for the CMS collector."
1333 " CMSParPromoteBlocksToClaim will take precedence.\n");
1334 }
1335 }
1336 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1337 // OldPLAB sizing manually turned off: Use a larger default setting,
1338 // unless it was manually specified. This is because a too-low value
1339 // will slow down scavenges.
1340 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1341 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1342 }
1343 }
1344 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1345 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1346 // If either of the static initialization defaults have changed, note this
1347 // modification.
1348 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1349 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1350 }
1351 if (PrintGCDetails && Verbose) {
1352 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1353 MarkStackSize / K, MarkStackSizeMax / K);
1354 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1355 }
1356 }
1357 #endif // INCLUDE_ALL_GCS
1358
1359 void set_object_alignment() {
1360 // Object alignment.
1361 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1362 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1363 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1364 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1365 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1366 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1367
1368 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1369 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1370
1371 // Oop encoding heap max
1372 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1373
1374 #if INCLUDE_ALL_GCS
1375 // Set CMS global values
1376 CompactibleFreeListSpace::set_cms_values();
1377 #endif // INCLUDE_ALL_GCS
1378 }
1379
1380 bool verify_object_alignment() {
1381 // Object alignment.
1382 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1383 jio_fprintf(defaultStream::error_stream(),
1384 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1385 (int)ObjectAlignmentInBytes);
1386 return false;
1387 }
1388 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1389 jio_fprintf(defaultStream::error_stream(),
1390 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1391 (int)ObjectAlignmentInBytes, BytesPerLong);
1392 return false;
1393 }
1394 // It does not make sense to have big object alignment
1395 // since a space lost due to alignment will be greater
1396 // then a saved space from compressed oops.
1397 if ((int)ObjectAlignmentInBytes > 256) {
1398 jio_fprintf(defaultStream::error_stream(),
1399 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1400 (int)ObjectAlignmentInBytes);
1401 return false;
1402 }
1403 // In case page size is very small.
1404 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1405 jio_fprintf(defaultStream::error_stream(),
1406 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1407 (int)ObjectAlignmentInBytes, os::vm_page_size());
1408 return false;
1409 }
1410 return true;
1411 }
1412
1413 uintx Arguments::max_heap_for_compressed_oops() {
1414 // Avoid sign flip.
1415 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1416 // We need to fit both the NULL page and the heap into the memory budget, while
1417 // keeping alignment constraints of the heap. To guarantee the latter, as the
1418 // NULL page is located before the heap, we pad the NULL page to the conservative
1419 // maximum alignment that the GC may ever impose upon the heap.
1420 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1421 _conservative_max_heap_alignment);
1422
1423 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1424 NOT_LP64(ShouldNotReachHere(); return 0);
1425 }
1426
1427 bool Arguments::should_auto_select_low_pause_collector() {
1428 if (UseAutoGCSelectPolicy &&
1429 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1430 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1431 if (PrintGCDetails) {
1432 // Cannot use gclog_or_tty yet.
1433 tty->print_cr("Automatic selection of the low pause collector"
1434 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1435 }
1436 return true;
1437 }
1438 return false;
1439 }
1440
1441 void Arguments::set_use_compressed_oops() {
1442 #ifndef ZERO
1443 #ifdef _LP64
1444 // MaxHeapSize is not set up properly at this point, but
1445 // the only value that can override MaxHeapSize if we are
1446 // to use UseCompressedOops is InitialHeapSize.
1447 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1448
1449 if (max_heap_size <= max_heap_for_compressed_oops()) {
1450 #if !defined(COMPILER1) || defined(TIERED)
1451 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1452 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1453 }
1454 #endif
1455 #ifdef _WIN64
1456 if (UseLargePages && UseCompressedOops) {
1457 // Cannot allocate guard pages for implicit checks in indexed addressing
1458 // mode, when large pages are specified on windows.
1459 // This flag could be switched ON if narrow oop base address is set to 0,
1460 // see code in Universe::initialize_heap().
1461 Universe::set_narrow_oop_use_implicit_null_checks(false);
1462 }
1463 #endif // _WIN64
1464 } else {
1465 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1466 warning("Max heap size too large for Compressed Oops");
1467 FLAG_SET_DEFAULT(UseCompressedOops, false);
1468 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1469 }
1470 }
1471 #endif // _LP64
1472 #endif // ZERO
1473 }
1474
1475
1476 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1477 // set_use_compressed_oops().
1478 void Arguments::set_use_compressed_klass_ptrs() {
1479 #ifndef ZERO
1480 #ifdef _LP64
1481 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1482 if (!UseCompressedOops) {
1483 if (UseCompressedClassPointers) {
1484 warning("UseCompressedClassPointers requires UseCompressedOops");
1485 }
1486 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1487 } else {
1488 // Turn on UseCompressedClassPointers too
1489 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1490 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1491 }
1492 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1493 if (UseCompressedClassPointers) {
1494 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1495 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1496 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1497 }
1498 }
1499 }
1500 #endif // _LP64
1501 #endif // !ZERO
1502 }
1503
1504 void Arguments::set_conservative_max_heap_alignment() {
1505 // The conservative maximum required alignment for the heap is the maximum of
1506 // the alignments imposed by several sources: any requirements from the heap
1507 // itself, the collector policy and the maximum page size we may run the VM
1508 // with.
1509 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1510 #if INCLUDE_ALL_GCS
1511 if (UseParallelGC) {
1512 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1513 } else if (UseG1GC) {
1514 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1515 }
1516 #endif // INCLUDE_ALL_GCS
1517 _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(),
1518 CollectorPolicy::compute_heap_alignment());
1519 }
1520
1521 void Arguments::set_ergonomics_flags() {
1522
1523 if (os::is_server_class_machine()) {
1524 // If no other collector is requested explicitly,
1525 // let the VM select the collector based on
1526 // machine class and automatic selection policy.
1527 if (!UseSerialGC &&
1528 !UseConcMarkSweepGC &&
1529 !UseG1GC &&
1530 !UseParNewGC &&
1531 FLAG_IS_DEFAULT(UseParallelGC)) {
1532 if (should_auto_select_low_pause_collector()) {
1533 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1534 } else {
1535 FLAG_SET_ERGO(bool, UseParallelGC, true);
1536 }
1537 }
1538 }
1539 #ifdef COMPILER2
1540 // Shared spaces work fine with other GCs but causes bytecode rewriting
1541 // to be disabled, which hurts interpreter performance and decreases
1542 // server performance. When -server is specified, keep the default off
1543 // unless it is asked for. Future work: either add bytecode rewriting
1544 // at link time, or rewrite bytecodes in non-shared methods.
1545 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1546 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1547 no_shared_spaces();
1548 }
1549 #endif
1550
1551 set_conservative_max_heap_alignment();
1552
1553 #ifndef ZERO
1554 #ifdef _LP64
1555 set_use_compressed_oops();
1556
1557 // set_use_compressed_klass_ptrs() must be called after calling
1558 // set_use_compressed_oops().
1559 set_use_compressed_klass_ptrs();
1560
1561 // Also checks that certain machines are slower with compressed oops
1562 // in vm_version initialization code.
1563 #endif // _LP64
1564 #endif // !ZERO
1565 }
1566
1567 void Arguments::set_parallel_gc_flags() {
1568 assert(UseParallelGC || UseParallelOldGC, "Error");
1569 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1570 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1571 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1572 }
1573 FLAG_SET_DEFAULT(UseParallelGC, true);
1574
1575 // If no heap maximum was requested explicitly, use some reasonable fraction
1576 // of the physical memory, up to a maximum of 1GB.
1577 FLAG_SET_DEFAULT(ParallelGCThreads,
1578 Abstract_VM_Version::parallel_worker_threads());
1579 if (ParallelGCThreads == 0) {
1580 jio_fprintf(defaultStream::error_stream(),
1581 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1582 vm_exit(1);
1583 }
1584
1585
1586 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1587 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1588 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1589 // See CR 6362902 for details.
1590 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1591 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1592 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1593 }
1594 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1595 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1596 }
1597 }
1598
1599 if (UseParallelOldGC) {
1600 // Par compact uses lower default values since they are treated as
1601 // minimums. These are different defaults because of the different
1602 // interpretation and are not ergonomically set.
1603 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1604 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1605 }
1606 }
1607 }
1608
1609 void Arguments::set_g1_gc_flags() {
1610 assert(UseG1GC, "Error");
1611 #ifdef COMPILER1
1612 FastTLABRefill = false;
1613 #endif
1614 FLAG_SET_DEFAULT(ParallelGCThreads,
1615 Abstract_VM_Version::parallel_worker_threads());
1616 if (ParallelGCThreads == 0) {
1617 FLAG_SET_DEFAULT(ParallelGCThreads,
1618 Abstract_VM_Version::parallel_worker_threads());
1619 }
1620
1621 // MarkStackSize will be set (if it hasn't been set by the user)
1622 // when concurrent marking is initialized.
1623 // Its value will be based upon the number of parallel marking threads.
1624 // But we do set the maximum mark stack size here.
1625 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1626 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1627 }
1628
1629 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1630 // In G1, we want the default GC overhead goal to be higher than
1631 // say in PS. So we set it here to 10%. Otherwise the heap might
1632 // be expanded more aggressively than we would like it to. In
1633 // fact, even 10% seems to not be high enough in some cases
1634 // (especially small GC stress tests that the main thing they do
1635 // is allocation). We might consider increase it further.
1636 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1637 }
1638
1639 if (PrintGCDetails && Verbose) {
1640 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1641 MarkStackSize / K, MarkStackSizeMax / K);
1642 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1643 }
1644 }
1645
1646 julong Arguments::limit_by_allocatable_memory(julong limit) {
1647 julong max_allocatable;
1648 julong result = limit;
1649 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1650 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1651 }
1652 return result;
1653 }
1654
1655 void Arguments::set_heap_size() {
1656 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1657 // Deprecated flag
1658 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1659 }
1660
1661 const julong phys_mem =
1662 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1663 : (julong)MaxRAM;
1664
1665 // If the maximum heap size has not been set with -Xmx,
1666 // then set it as fraction of the size of physical memory,
1667 // respecting the maximum and minimum sizes of the heap.
1668 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1669 julong reasonable_max = phys_mem / MaxRAMFraction;
1670
1671 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1672 // Small physical memory, so use a minimum fraction of it for the heap
1673 reasonable_max = phys_mem / MinRAMFraction;
1674 } else {
1675 // Not-small physical memory, so require a heap at least
1676 // as large as MaxHeapSize
1677 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1678 }
1679 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1680 // Limit the heap size to ErgoHeapSizeLimit
1681 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1682 }
1683 if (UseCompressedOops) {
1684 // Limit the heap size to the maximum possible when using compressed oops
1685 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1686 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1687 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1688 // but it should be not less than default MaxHeapSize.
1689 max_coop_heap -= HeapBaseMinAddress;
1690 }
1691 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1692 }
1693 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1694
1695 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1696 // An initial heap size was specified on the command line,
1697 // so be sure that the maximum size is consistent. Done
1698 // after call to limit_by_allocatable_memory because that
1699 // method might reduce the allocation size.
1700 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1701 }
1702
1703 if (PrintGCDetails && Verbose) {
1704 // Cannot use gclog_or_tty yet.
1705 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1706 }
1707 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1708 }
1709
1710 // If the minimum or initial heap_size have not been set or requested to be set
1711 // ergonomically, set them accordingly.
1712 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1713 julong reasonable_minimum = (julong)(OldSize + NewSize);
1714
1715 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1716
1717 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1718
1719 if (InitialHeapSize == 0) {
1720 julong reasonable_initial = phys_mem / InitialRAMFraction;
1721
1722 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1723 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1724
1725 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1726
1727 if (PrintGCDetails && Verbose) {
1728 // Cannot use gclog_or_tty yet.
1729 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1730 }
1731 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1732 }
1733 // If the minimum heap size has not been set (via -Xms),
1734 // synchronize with InitialHeapSize to avoid errors with the default value.
1735 if (min_heap_size() == 0) {
1736 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1737 if (PrintGCDetails && Verbose) {
1738 // Cannot use gclog_or_tty yet.
1739 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1740 }
1741 }
1742 }
1743 }
1744
1745 // This must be called after ergonomics because we want bytecode rewriting
1746 // if the server compiler is used, or if UseSharedSpaces is disabled.
1747 void Arguments::set_bytecode_flags() {
1748 // Better not attempt to store into a read-only space.
1749 if (UseSharedSpaces) {
1750 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1751 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1752 }
1753
1754 if (!RewriteBytecodes) {
1755 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1756 }
1757 }
1758
1759 // Aggressive optimization flags -XX:+AggressiveOpts
1760 void Arguments::set_aggressive_opts_flags() {
1761 #ifdef COMPILER2
1762 if (AggressiveUnboxing) {
1763 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1764 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1765 } else if (!EliminateAutoBox) {
1766 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1767 AggressiveUnboxing = false;
1768 }
1769 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1770 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1771 } else if (!DoEscapeAnalysis) {
1772 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1773 AggressiveUnboxing = false;
1774 }
1775 }
1776 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1777 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1778 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1779 }
1780 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1781 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1782 }
1783
1784 // Feed the cache size setting into the JDK
1785 char buffer[1024];
1786 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1787 add_property(buffer);
1788 }
1789 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1790 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1791 }
1792 #endif
1793
1794 if (AggressiveOpts) {
1795 // Sample flag setting code
1796 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1797 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1798 // }
1799 }
1800 }
1801
1802 //===========================================================================================================
1803 // Parsing of java.compiler property
1804
1805 void Arguments::process_java_compiler_argument(char* arg) {
1806 // For backwards compatibility, Djava.compiler=NONE or ""
1807 // causes us to switch to -Xint mode UNLESS -Xdebug
1808 // is also specified.
1809 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1810 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1811 }
1812 }
1813
1814 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1815 _sun_java_launcher = strdup(launcher);
1816 if (strcmp("gamma", _sun_java_launcher) == 0) {
1817 _created_by_gamma_launcher = true;
1818 }
1819 }
1820
1821 bool Arguments::created_by_java_launcher() {
1822 assert(_sun_java_launcher != NULL, "property must have value");
1823 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1824 }
1825
1826 bool Arguments::created_by_gamma_launcher() {
1827 return _created_by_gamma_launcher;
1828 }
1829
1830 //===========================================================================================================
1831 // Parsing of main arguments
1832
1833 bool Arguments::verify_interval(uintx val, uintx min,
1834 uintx max, const char* name) {
1835 // Returns true iff value is in the inclusive interval [min..max]
1836 // false, otherwise.
1837 if (val >= min && val <= max) {
1838 return true;
1839 }
1840 jio_fprintf(defaultStream::error_stream(),
1841 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1842 " and " UINTX_FORMAT "\n",
1843 name, val, min, max);
1844 return false;
1845 }
1846
1847 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1848 // Returns true if given value is at least specified min threshold
1849 // false, otherwise.
1850 if (val >= min ) {
1851 return true;
1852 }
1853 jio_fprintf(defaultStream::error_stream(),
1854 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1855 name, val, min);
1856 return false;
1857 }
1858
1859 bool Arguments::verify_percentage(uintx value, const char* name) {
1860 if (value <= 100) {
1861 return true;
1862 }
1863 jio_fprintf(defaultStream::error_stream(),
1864 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1865 name, value);
1866 return false;
1867 }
1868
1869 #if !INCLUDE_ALL_GCS
1870 #ifdef ASSERT
1871 static bool verify_serial_gc_flags() {
1872 return (UseSerialGC &&
1873 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1874 UseParallelGC || UseParallelOldGC));
1875 }
1876 #endif // ASSERT
1877 #endif // INCLUDE_ALL_GCS
1878
1879 // check if do gclog rotation
1880 // +UseGCLogFileRotation is a must,
1881 // no gc log rotation when log file not supplied or
1882 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1883 void check_gclog_consistency() {
1884 if (UseGCLogFileRotation) {
1885 if ((Arguments::gc_log_filename() == NULL) ||
1886 (NumberOfGCLogFiles == 0) ||
1887 (GCLogFileSize == 0)) {
1888 jio_fprintf(defaultStream::output_stream(),
1889 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>[k|K|m|M|g|G]\n"
1890 "where num_of_file > 0 and num_of_size > 0\n"
1891 "GC log rotation is turned off\n");
1892 UseGCLogFileRotation = false;
1893 }
1894 }
1895
1896 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1897 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1898 jio_fprintf(defaultStream::output_stream(),
1899 "GCLogFileSize changed to minimum 8K\n");
1900 }
1901 }
1902
1903 // This function is called for -Xloggc:<filename>, it can be used
1904 // to check if a given file name(or string) conforms to the following
1905 // specification:
1906 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1907 // %p and %t only allowed once. We only limit usage of filename not path
1908 bool is_filename_valid(const char *file_name) {
1909 const char* p = file_name;
1910 char file_sep = os::file_separator()[0];
1911 const char* cp;
1912 // skip prefix path
1913 for (cp = file_name; *cp != '\0'; cp++) {
1914 if (*cp == '/' || *cp == file_sep) {
1915 p = cp + 1;
1916 }
1917 }
1918
1919 int count_p = 0;
1920 int count_t = 0;
1921 while (*p != '\0') {
1922 if ((*p >= '0' && *p <= '9') ||
1923 (*p >= 'A' && *p <= 'Z') ||
1924 (*p >= 'a' && *p <= 'z') ||
1925 *p == '-' ||
1926 *p == '_' ||
1927 *p == '.') {
1928 p++;
1929 continue;
1930 }
1931 if (*p == '%') {
1932 if(*(p + 1) == 'p') {
1933 p += 2;
1934 count_p ++;
1935 continue;
1936 }
1937 if (*(p + 1) == 't') {
1938 p += 2;
1939 count_t ++;
1940 continue;
1941 }
1942 }
1943 return false;
1944 }
1945 return count_p < 2 && count_t < 2;
1946 }
1947
1948 // Check consistency of GC selection
1949 bool Arguments::check_gc_consistency() {
1950 check_gclog_consistency();
1951 bool status = true;
1952 // Ensure that the user has not selected conflicting sets
1953 // of collectors. [Note: this check is merely a user convenience;
1954 // collectors over-ride each other so that only a non-conflicting
1955 // set is selected; however what the user gets is not what they
1956 // may have expected from the combination they asked for. It's
1957 // better to reduce user confusion by not allowing them to
1958 // select conflicting combinations.
1959 uint i = 0;
1960 if (UseSerialGC) i++;
1961 if (UseConcMarkSweepGC || UseParNewGC) i++;
1962 if (UseParallelGC || UseParallelOldGC) i++;
1963 if (UseG1GC) i++;
1964 if (i > 1) {
1965 jio_fprintf(defaultStream::error_stream(),
1966 "Conflicting collector combinations in option list; "
1967 "please refer to the release notes for the combinations "
1968 "allowed\n");
1969 status = false;
1970 }
1971 return status;
1972 }
1973
1974 void Arguments::check_deprecated_gcs() {
1975 if (UseConcMarkSweepGC && !UseParNewGC) {
1976 warning("Using the DefNew young collector with the CMS collector is deprecated "
1977 "and will likely be removed in a future release");
1978 }
1979
1980 if (UseParNewGC && !UseConcMarkSweepGC) {
1981 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
1982 // set up UseSerialGC properly, so that can't be used in the check here.
1983 warning("Using the ParNew young collector with the Serial old collector is deprecated "
1984 "and will likely be removed in a future release");
1985 }
1986
1987 if (CMSIncrementalMode) {
1988 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
1989 }
1990 }
1991
1992 void Arguments::check_deprecated_gc_flags() {
1993 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
1994 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
1995 "and will likely be removed in future release");
1996 }
1997 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
1998 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
1999 "Use MaxRAMFraction instead.");
2000 }
2001 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2002 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2003 }
2004 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2005 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2006 }
2007 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2008 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2009 }
2010 }
2011
2012 // Check stack pages settings
2013 bool Arguments::check_stack_pages()
2014 {
2015 bool status = true;
2016 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2017 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2018 // greater stack shadow pages can't generate instruction to bang stack
2019 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2020 return status;
2021 }
2022
2023 // Check the consistency of vm_init_args
2024 bool Arguments::check_vm_args_consistency() {
2025 // Method for adding checks for flag consistency.
2026 // The intent is to warn the user of all possible conflicts,
2027 // before returning an error.
2028 // Note: Needs platform-dependent factoring.
2029 bool status = true;
2030
2031 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2032 // builds so the cost of stack banging can be measured.
2033 #if (defined(PRODUCT) && defined(SOLARIS))
2034 if (!UseBoundThreads && !UseStackBanging) {
2035 jio_fprintf(defaultStream::error_stream(),
2036 "-UseStackBanging conflicts with -UseBoundThreads\n");
2037
2038 status = false;
2039 }
2040 #endif
2041
2042 if (TLABRefillWasteFraction == 0) {
2043 jio_fprintf(defaultStream::error_stream(),
2044 "TLABRefillWasteFraction should be a denominator, "
2045 "not " SIZE_FORMAT "\n",
2046 TLABRefillWasteFraction);
2047 status = false;
2048 }
2049
2050 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2051 "AdaptiveSizePolicyWeight");
2052 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2053 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
2054 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
2055
2056 // Divide by bucket size to prevent a large size from causing rollover when
2057 // calculating amount of memory needed to be allocated for the String table.
2058 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2059 (max_uintx / StringTable::bucket_size()), "StringTable size");
2060
2061 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2062 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2063
2064 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
2065 jio_fprintf(defaultStream::error_stream(),
2066 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2067 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
2068 MinHeapFreeRatio, MaxHeapFreeRatio);
2069 status = false;
2070 }
2071 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2072 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
2073
2074 // Min/MaxMetaspaceFreeRatio
2075 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2076 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2077
2078 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2079 jio_fprintf(defaultStream::error_stream(),
2080 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2081 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2082 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2083 MinMetaspaceFreeRatio,
2084 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2085 MaxMetaspaceFreeRatio);
2086 status = false;
2087 }
2088
2089 // Trying to keep 100% free is not practical
2090 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2091
2092 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2093 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2094 }
2095
2096 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2097 // Settings to encourage splitting.
2098 if (!FLAG_IS_CMDLINE(NewRatio)) {
2099 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2100 }
2101 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2102 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2103 }
2104 }
2105
2106 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2107 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2108 if (GCTimeLimit == 100) {
2109 // Turn off gc-overhead-limit-exceeded checks
2110 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2111 }
2112
2113 status = status && check_gc_consistency();
2114 status = status && check_stack_pages();
2115
2116 if (CMSIncrementalMode) {
2117 if (!UseConcMarkSweepGC) {
2118 jio_fprintf(defaultStream::error_stream(),
2119 "error: invalid argument combination.\n"
2120 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2121 "selected in order\nto use CMSIncrementalMode.\n");
2122 status = false;
2123 } else {
2124 status = status && verify_percentage(CMSIncrementalDutyCycle,
2125 "CMSIncrementalDutyCycle");
2126 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2127 "CMSIncrementalDutyCycleMin");
2128 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2129 "CMSIncrementalSafetyFactor");
2130 status = status && verify_percentage(CMSIncrementalOffset,
2131 "CMSIncrementalOffset");
2132 status = status && verify_percentage(CMSExpAvgFactor,
2133 "CMSExpAvgFactor");
2134 // If it was not set on the command line, set
2135 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2136 if (CMSInitiatingOccupancyFraction < 0) {
2137 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2138 }
2139 }
2140 }
2141
2142 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2143 // insists that we hold the requisite locks so that the iteration is
2144 // MT-safe. For the verification at start-up and shut-down, we don't
2145 // yet have a good way of acquiring and releasing these locks,
2146 // which are not visible at the CollectedHeap level. We want to
2147 // be able to acquire these locks and then do the iteration rather
2148 // than just disable the lock verification. This will be fixed under
2149 // bug 4788986.
2150 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2151 if (VerifyDuringStartup) {
2152 warning("Heap verification at start-up disabled "
2153 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2154 VerifyDuringStartup = false; // Disable verification at start-up
2155 }
2156
2157 if (VerifyBeforeExit) {
2158 warning("Heap verification at shutdown disabled "
2159 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2160 VerifyBeforeExit = false; // Disable verification at shutdown
2161 }
2162 }
2163
2164 // Note: only executed in non-PRODUCT mode
2165 if (!UseAsyncConcMarkSweepGC &&
2166 (ExplicitGCInvokesConcurrent ||
2167 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2168 jio_fprintf(defaultStream::error_stream(),
2169 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2170 " with -UseAsyncConcMarkSweepGC");
2171 status = false;
2172 }
2173
2174 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2175
2176 #if INCLUDE_ALL_GCS
2177 if (UseG1GC) {
2178 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2179 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2180 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2181
2182 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2183 "InitiatingHeapOccupancyPercent");
2184 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2185 "G1RefProcDrainInterval");
2186 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2187 "G1ConcMarkStepDurationMillis");
2188 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2189 "G1ConcRSHotCardLimit");
2190 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2191 "G1ConcRSLogCacheSize");
2192 }
2193 if (UseConcMarkSweepGC) {
2194 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2195 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2196 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2197 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2198
2199 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2200
2201 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2202 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2203 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2204
2205 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2206
2207 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2208 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2209
2210 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2211 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2212 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2213
2214 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2215
2216 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2217
2218 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2219 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2220 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2221 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2222 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2223 }
2224
2225 if (UseParallelGC || UseParallelOldGC) {
2226 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2227 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2228
2229 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2230 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2231
2232 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2233 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2234
2235 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2236
2237 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2238 }
2239 #endif // INCLUDE_ALL_GCS
2240
2241 status = status && verify_interval(RefDiscoveryPolicy,
2242 ReferenceProcessor::DiscoveryPolicyMin,
2243 ReferenceProcessor::DiscoveryPolicyMax,
2244 "RefDiscoveryPolicy");
2245
2246 // Limit the lower bound of this flag to 1 as it is used in a division
2247 // expression.
2248 status = status && verify_interval(TLABWasteTargetPercent,
2249 1, 100, "TLABWasteTargetPercent");
2250
2251 status = status && verify_object_alignment();
2252
2253 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2254 "CompressedClassSpaceSize");
2255
2256 status = status && verify_interval(MarkStackSizeMax,
2257 1, (max_jint - 1), "MarkStackSizeMax");
2258 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2259
2260 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2261
2262 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2263
2264 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2265
2266 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2267 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2268
2269 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2270
2271 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2272 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2273 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2274 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2275
2276 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2277 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2278
2279 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2280 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2281 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2282
2283 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2284 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2285
2286 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2287 // just for that, so hardcode here.
2288 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2289 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2290 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2291 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2292
2293 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2294
2295 if (PrintNMTStatistics) {
2296 #if INCLUDE_NMT
2297 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2298 #endif // INCLUDE_NMT
2299 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2300 PrintNMTStatistics = false;
2301 #if INCLUDE_NMT
2302 }
2303 #endif
2304 }
2305
2306 // Need to limit the extent of the padding to reasonable size.
2307 // 8K is well beyond the reasonable HW cache line size, even with the
2308 // aggressive prefetching, while still leaving the room for segregating
2309 // among the distinct pages.
2310 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2311 jio_fprintf(defaultStream::error_stream(),
2312 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2313 ContendedPaddingWidth, 0, 8192);
2314 status = false;
2315 }
2316
2317 // Need to enforce the padding not to break the existing field alignments.
2318 // It is sufficient to check against the largest type size.
2319 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2320 jio_fprintf(defaultStream::error_stream(),
2321 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2322 ContendedPaddingWidth, BytesPerLong);
2323 status = false;
2324 }
2325
2326 // Check lower bounds of the code cache
2327 // Template Interpreter code is approximately 3X larger in debug builds.
2328 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2329 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2330 jio_fprintf(defaultStream::error_stream(),
2331 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2332 os::vm_page_size()/K);
2333 status = false;
2334 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2335 jio_fprintf(defaultStream::error_stream(),
2336 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2337 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2338 status = false;
2339 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2340 jio_fprintf(defaultStream::error_stream(),
2341 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2342 min_code_cache_size/K);
2343 status = false;
2344 } else if (ReservedCodeCacheSize > 2*G) {
2345 // Code cache size larger than MAXINT is not supported.
2346 jio_fprintf(defaultStream::error_stream(),
2347 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2348 (2*G)/M);
2349 status = false;
2350 }
2351
2352 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2353 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2354 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2355 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2356
2357 return status;
2358 }
2359
2360 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2361 const char* option_type) {
2362 if (ignore) return false;
2363
2364 const char* spacer = " ";
2365 if (option_type == NULL) {
2366 option_type = ++spacer; // Set both to the empty string.
2367 }
2368
2369 if (os::obsolete_option(option)) {
2370 jio_fprintf(defaultStream::error_stream(),
2371 "Obsolete %s%soption: %s\n", option_type, spacer,
2372 option->optionString);
2373 return false;
2374 } else {
2375 jio_fprintf(defaultStream::error_stream(),
2376 "Unrecognized %s%soption: %s\n", option_type, spacer,
2377 option->optionString);
2378 return true;
2379 }
2380 }
2381
2382 static const char* user_assertion_options[] = {
2383 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2384 };
2385
2386 static const char* system_assertion_options[] = {
2387 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2388 };
2389
2390 // Return true if any of the strings in null-terminated array 'names' matches.
2391 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2392 // the option must match exactly.
2393 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2394 bool tail_allowed) {
2395 for (/* empty */; *names != NULL; ++names) {
2396 if (match_option(option, *names, tail)) {
2397 if (**tail == '\0' || tail_allowed && **tail == ':') {
2398 return true;
2399 }
2400 }
2401 }
2402 return false;
2403 }
2404
2405 bool Arguments::parse_uintx(const char* value,
2406 uintx* uintx_arg,
2407 uintx min_size) {
2408
2409 // Check the sign first since atomull() parses only unsigned values.
2410 bool value_is_positive = !(*value == '-');
2411
2412 if (value_is_positive) {
2413 julong n;
2414 bool good_return = atomull(value, &n);
2415 if (good_return) {
2416 bool above_minimum = n >= min_size;
2417 bool value_is_too_large = n > max_uintx;
2418
2419 if (above_minimum && !value_is_too_large) {
2420 *uintx_arg = n;
2421 return true;
2422 }
2423 }
2424 }
2425 return false;
2426 }
2427
2428 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2429 julong* long_arg,
2430 julong min_size) {
2431 if (!atomull(s, long_arg)) return arg_unreadable;
2432 return check_memory_size(*long_arg, min_size);
2433 }
2434
2435 // Parse JavaVMInitArgs structure
2436
2437 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2438 // For components of the system classpath.
2439 SysClassPath scp(Arguments::get_sysclasspath());
2440 bool scp_assembly_required = false;
2441
2442 // Save default settings for some mode flags
2443 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2444 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2445 Arguments::_ClipInlining = ClipInlining;
2446 Arguments::_BackgroundCompilation = BackgroundCompilation;
2447
2448 // Setup flags for mixed which is the default
2449 set_mode_flags(_mixed);
2450
2451 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2452 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2453 if (result != JNI_OK) {
2454 return result;
2455 }
2456
2457 // Parse JavaVMInitArgs structure passed in
2458 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2459 if (result != JNI_OK) {
2460 return result;
2461 }
2462
2463 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2464 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2465 if (result != JNI_OK) {
2466 return result;
2467 }
2468
2469 // Do final processing now that all arguments have been parsed
2470 result = finalize_vm_init_args(&scp, scp_assembly_required);
2471 if (result != JNI_OK) {
2472 return result;
2473 }
2474
2475 return JNI_OK;
2476 }
2477
2478 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2479 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2480 // are dealing with -agentpath (case where name is a path), otherwise with
2481 // -agentlib
2482 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2483 char *_name;
2484 const char *_hprof = "hprof", *_jdwp = "jdwp";
2485 size_t _len_hprof, _len_jdwp, _len_prefix;
2486
2487 if (is_path) {
2488 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2489 return false;
2490 }
2491
2492 _name++; // skip past last path separator
2493 _len_prefix = strlen(JNI_LIB_PREFIX);
2494
2495 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2496 return false;
2497 }
2498
2499 _name += _len_prefix;
2500 _len_hprof = strlen(_hprof);
2501 _len_jdwp = strlen(_jdwp);
2502
2503 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2504 _name += _len_hprof;
2505 }
2506 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2507 _name += _len_jdwp;
2508 }
2509 else {
2510 return false;
2511 }
2512
2513 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2514 return false;
2515 }
2516
2517 return true;
2518 }
2519
2520 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2521 return true;
2522 }
2523
2524 return false;
2525 }
2526
2527 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2528 SysClassPath* scp_p,
2529 bool* scp_assembly_required_p,
2530 Flag::Flags origin) {
2531 // Remaining part of option string
2532 const char* tail;
2533
2534 // iterate over arguments
2535 for (int index = 0; index < args->nOptions; index++) {
2536 bool is_absolute_path = false; // for -agentpath vs -agentlib
2537
2538 const JavaVMOption* option = args->options + index;
2539
2540 if (!match_option(option, "-Djava.class.path", &tail) &&
2541 !match_option(option, "-Dsun.java.command", &tail) &&
2542 !match_option(option, "-Dsun.java.launcher", &tail)) {
2543
2544 // add all jvm options to the jvm_args string. This string
2545 // is used later to set the java.vm.args PerfData string constant.
2546 // the -Djava.class.path and the -Dsun.java.command options are
2547 // omitted from jvm_args string as each have their own PerfData
2548 // string constant object.
2549 build_jvm_args(option->optionString);
2550 }
2551
2552 // -verbose:[class/gc/jni]
2553 if (match_option(option, "-verbose", &tail)) {
2554 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2555 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2556 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2557 } else if (!strcmp(tail, ":gc")) {
2558 FLAG_SET_CMDLINE(bool, PrintGC, true);
2559 } else if (!strcmp(tail, ":jni")) {
2560 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2561 }
2562 // -da / -ea / -disableassertions / -enableassertions
2563 // These accept an optional class/package name separated by a colon, e.g.,
2564 // -da:java.lang.Thread.
2565 } else if (match_option(option, user_assertion_options, &tail, true)) {
2566 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2567 if (*tail == '\0') {
2568 JavaAssertions::setUserClassDefault(enable);
2569 } else {
2570 assert(*tail == ':', "bogus match by match_option()");
2571 JavaAssertions::addOption(tail + 1, enable);
2572 }
2573 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2574 } else if (match_option(option, system_assertion_options, &tail, false)) {
2575 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2576 JavaAssertions::setSystemClassDefault(enable);
2577 // -bootclasspath:
2578 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2579 scp_p->reset_path(tail);
2580 *scp_assembly_required_p = true;
2581 // -bootclasspath/a:
2582 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2583 scp_p->add_suffix(tail);
2584 *scp_assembly_required_p = true;
2585 // -bootclasspath/p:
2586 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2587 scp_p->add_prefix(tail);
2588 *scp_assembly_required_p = true;
2589 // -Xrun
2590 } else if (match_option(option, "-Xrun", &tail)) {
2591 if (tail != NULL) {
2592 const char* pos = strchr(tail, ':');
2593 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2594 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2595 name[len] = '\0';
2596
2597 char *options = NULL;
2598 if(pos != NULL) {
2599 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2600 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2601 }
2602 #if !INCLUDE_JVMTI
2603 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2604 jio_fprintf(defaultStream::error_stream(),
2605 "Profiling and debugging agents are not supported in this VM\n");
2606 return JNI_ERR;
2607 }
2608 #endif // !INCLUDE_JVMTI
2609 add_init_library(name, options);
2610 }
2611 // -agentlib and -agentpath
2612 } else if (match_option(option, "-agentlib:", &tail) ||
2613 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2614 if(tail != NULL) {
2615 const char* pos = strchr(tail, '=');
2616 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2617 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2618 name[len] = '\0';
2619
2620 char *options = NULL;
2621 if(pos != NULL) {
2622 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2623 }
2624 #if !INCLUDE_JVMTI
2625 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2626 jio_fprintf(defaultStream::error_stream(),
2627 "Profiling and debugging agents are not supported in this VM\n");
2628 return JNI_ERR;
2629 }
2630 #endif // !INCLUDE_JVMTI
2631 add_init_agent(name, options, is_absolute_path);
2632 }
2633 // -javaagent
2634 } else if (match_option(option, "-javaagent:", &tail)) {
2635 #if !INCLUDE_JVMTI
2636 jio_fprintf(defaultStream::error_stream(),
2637 "Instrumentation agents are not supported in this VM\n");
2638 return JNI_ERR;
2639 #else
2640 if(tail != NULL) {
2641 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2642 add_init_agent("instrument", options, false);
2643 }
2644 #endif // !INCLUDE_JVMTI
2645 // -Xnoclassgc
2646 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2647 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2648 // -Xincgc: i-CMS
2649 } else if (match_option(option, "-Xincgc", &tail)) {
2650 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2651 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2652 // -Xnoincgc: no i-CMS
2653 } else if (match_option(option, "-Xnoincgc", &tail)) {
2654 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2655 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2656 // -Xconcgc
2657 } else if (match_option(option, "-Xconcgc", &tail)) {
2658 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2659 // -Xnoconcgc
2660 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2661 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2662 // -Xbatch
2663 } else if (match_option(option, "-Xbatch", &tail)) {
2664 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2665 // -Xmn for compatibility with other JVM vendors
2666 } else if (match_option(option, "-Xmn", &tail)) {
2667 julong long_initial_young_size = 0;
2668 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2669 if (errcode != arg_in_range) {
2670 jio_fprintf(defaultStream::error_stream(),
2671 "Invalid initial young generation size: %s\n", option->optionString);
2672 describe_range_error(errcode);
2673 return JNI_EINVAL;
2674 }
2675 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2676 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2677 // -Xms
2678 } else if (match_option(option, "-Xms", &tail)) {
2679 julong long_initial_heap_size = 0;
2680 // an initial heap size of 0 means automatically determine
2681 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2682 if (errcode != arg_in_range) {
2683 jio_fprintf(defaultStream::error_stream(),
2684 "Invalid initial heap size: %s\n", option->optionString);
2685 describe_range_error(errcode);
2686 return JNI_EINVAL;
2687 }
2688 set_min_heap_size((uintx)long_initial_heap_size);
2689 // Currently the minimum size and the initial heap sizes are the same.
2690 // Can be overridden with -XX:InitialHeapSize.
2691 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2692 // -Xmx
2693 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2694 julong long_max_heap_size = 0;
2695 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2696 if (errcode != arg_in_range) {
2697 jio_fprintf(defaultStream::error_stream(),
2698 "Invalid maximum heap size: %s\n", option->optionString);
2699 describe_range_error(errcode);
2700 return JNI_EINVAL;
2701 }
2702 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2703 // Xmaxf
2704 } else if (match_option(option, "-Xmaxf", &tail)) {
2705 char* err;
2706 int maxf = (int)(strtod(tail, &err) * 100);
2707 if (*err != '\0' || maxf < 0 || maxf > 100) {
2708 jio_fprintf(defaultStream::error_stream(),
2709 "Bad max heap free percentage size: %s\n",
2710 option->optionString);
2711 return JNI_EINVAL;
2712 } else {
2713 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2714 }
2715 // Xminf
2716 } else if (match_option(option, "-Xminf", &tail)) {
2717 char* err;
2718 int minf = (int)(strtod(tail, &err) * 100);
2719 if (*err != '\0' || minf < 0 || minf > 100) {
2720 jio_fprintf(defaultStream::error_stream(),
2721 "Bad min heap free percentage size: %s\n",
2722 option->optionString);
2723 return JNI_EINVAL;
2724 } else {
2725 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2726 }
2727 // -Xss
2728 } else if (match_option(option, "-Xss", &tail)) {
2729 julong long_ThreadStackSize = 0;
2730 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2731 if (errcode != arg_in_range) {
2732 jio_fprintf(defaultStream::error_stream(),
2733 "Invalid thread stack size: %s\n", option->optionString);
2734 describe_range_error(errcode);
2735 return JNI_EINVAL;
2736 }
2737 // Internally track ThreadStackSize in units of 1024 bytes.
2738 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2739 round_to((int)long_ThreadStackSize, K) / K);
2740 // -Xoss
2741 } else if (match_option(option, "-Xoss", &tail)) {
2742 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2743 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2744 julong long_CodeCacheExpansionSize = 0;
2745 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2746 if (errcode != arg_in_range) {
2747 jio_fprintf(defaultStream::error_stream(),
2748 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2749 os::vm_page_size()/K);
2750 return JNI_EINVAL;
2751 }
2752 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2753 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2754 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2755 julong long_ReservedCodeCacheSize = 0;
2756
2757 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2758 if (errcode != arg_in_range) {
2759 jio_fprintf(defaultStream::error_stream(),
2760 "Invalid maximum code cache size: %s.\n", option->optionString);
2761 return JNI_EINVAL;
2762 }
2763 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2764 //-XX:IncreaseFirstTierCompileThresholdAt=
2765 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2766 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2767 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2768 jio_fprintf(defaultStream::error_stream(),
2769 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2770 option->optionString);
2771 return JNI_EINVAL;
2772 }
2773 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2774 // -green
2775 } else if (match_option(option, "-green", &tail)) {
2776 jio_fprintf(defaultStream::error_stream(),
2777 "Green threads support not available\n");
2778 return JNI_EINVAL;
2779 // -native
2780 } else if (match_option(option, "-native", &tail)) {
2781 // HotSpot always uses native threads, ignore silently for compatibility
2782 // -Xsqnopause
2783 } else if (match_option(option, "-Xsqnopause", &tail)) {
2784 // EVM option, ignore silently for compatibility
2785 // -Xrs
2786 } else if (match_option(option, "-Xrs", &tail)) {
2787 // Classic/EVM option, new functionality
2788 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2789 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2790 // change default internal VM signals used - lower case for back compat
2791 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2792 // -Xoptimize
2793 } else if (match_option(option, "-Xoptimize", &tail)) {
2794 // EVM option, ignore silently for compatibility
2795 // -Xprof
2796 } else if (match_option(option, "-Xprof", &tail)) {
2797 #if INCLUDE_FPROF
2798 _has_profile = true;
2799 #else // INCLUDE_FPROF
2800 jio_fprintf(defaultStream::error_stream(),
2801 "Flat profiling is not supported in this VM.\n");
2802 return JNI_ERR;
2803 #endif // INCLUDE_FPROF
2804 // -Xconcurrentio
2805 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2806 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2807 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2808 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2809 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2810 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2811
2812 // -Xinternalversion
2813 } else if (match_option(option, "-Xinternalversion", &tail)) {
2814 jio_fprintf(defaultStream::output_stream(), "%s\n",
2815 VM_Version::internal_vm_info_string());
2816 vm_exit(0);
2817 #ifndef PRODUCT
2818 // -Xprintflags
2819 } else if (match_option(option, "-Xprintflags", &tail)) {
2820 CommandLineFlags::printFlags(tty, false);
2821 vm_exit(0);
2822 #endif
2823 // -D
2824 } else if (match_option(option, "-D", &tail)) {
2825 if (!add_property(tail)) {
2826 return JNI_ENOMEM;
2827 }
2828 // Out of the box management support
2829 if (match_option(option, "-Dcom.sun.management", &tail)) {
2830 #if INCLUDE_MANAGEMENT
2831 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2832 #else
2833 jio_fprintf(defaultStream::output_stream(),
2834 "-Dcom.sun.management is not supported in this VM.\n");
2835 return JNI_ERR;
2836 #endif
2837 }
2838 // -Xint
2839 } else if (match_option(option, "-Xint", &tail)) {
2840 set_mode_flags(_int);
2841 // -Xmixed
2842 } else if (match_option(option, "-Xmixed", &tail)) {
2843 set_mode_flags(_mixed);
2844 // -Xcomp
2845 } else if (match_option(option, "-Xcomp", &tail)) {
2846 // for testing the compiler; turn off all flags that inhibit compilation
2847 set_mode_flags(_comp);
2848 // -Xshare:dump
2849 } else if (match_option(option, "-Xshare:dump", &tail)) {
2850 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2851 set_mode_flags(_int); // Prevent compilation, which creates objects
2852 // -Xshare:on
2853 } else if (match_option(option, "-Xshare:on", &tail)) {
2854 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2855 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2856 // -Xshare:auto
2857 } else if (match_option(option, "-Xshare:auto", &tail)) {
2858 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2859 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2860 // -Xshare:off
2861 } else if (match_option(option, "-Xshare:off", &tail)) {
2862 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2863 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2864 // -Xverify
2865 } else if (match_option(option, "-Xverify", &tail)) {
2866 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2867 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2868 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2869 } else if (strcmp(tail, ":remote") == 0) {
2870 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2871 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2872 } else if (strcmp(tail, ":none") == 0) {
2873 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2874 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2875 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2876 return JNI_EINVAL;
2877 }
2878 // -Xdebug
2879 } else if (match_option(option, "-Xdebug", &tail)) {
2880 // note this flag has been used, then ignore
2881 set_xdebug_mode(true);
2882 // -Xnoagent
2883 } else if (match_option(option, "-Xnoagent", &tail)) {
2884 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2885 } else if (match_option(option, "-Xboundthreads", &tail)) {
2886 // Bind user level threads to kernel threads (Solaris only)
2887 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2888 } else if (match_option(option, "-Xloggc:", &tail)) {
2889 // Redirect GC output to the file. -Xloggc:<filename>
2890 // ostream_init_log(), when called will use this filename
2891 // to initialize a fileStream.
2892 _gc_log_filename = strdup(tail);
2893 if (!is_filename_valid(_gc_log_filename)) {
2894 jio_fprintf(defaultStream::output_stream(),
2895 "Invalid file name for use with -Xloggc: Filename can only contain the "
2896 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2897 "Note %%p or %%t can only be used once\n", _gc_log_filename);
2898 return JNI_EINVAL;
2899 }
2900 FLAG_SET_CMDLINE(bool, PrintGC, true);
2901 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2902
2903 // JNI hooks
2904 } else if (match_option(option, "-Xcheck", &tail)) {
2905 if (!strcmp(tail, ":jni")) {
2906 #if !INCLUDE_JNI_CHECK
2907 warning("JNI CHECKING is not supported in this VM");
2908 #else
2909 CheckJNICalls = true;
2910 #endif // INCLUDE_JNI_CHECK
2911 } else if (is_bad_option(option, args->ignoreUnrecognized,
2912 "check")) {
2913 return JNI_EINVAL;
2914 }
2915 } else if (match_option(option, "vfprintf", &tail)) {
2916 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2917 } else if (match_option(option, "exit", &tail)) {
2918 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2919 } else if (match_option(option, "abort", &tail)) {
2920 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2921 // -XX:+AggressiveHeap
2922 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2923
2924 // This option inspects the machine and attempts to set various
2925 // parameters to be optimal for long-running, memory allocation
2926 // intensive jobs. It is intended for machines with large
2927 // amounts of cpu and memory.
2928
2929 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2930 // VM, but we may not be able to represent the total physical memory
2931 // available (like having 8gb of memory on a box but using a 32bit VM).
2932 // Thus, we need to make sure we're using a julong for intermediate
2933 // calculations.
2934 julong initHeapSize;
2935 julong total_memory = os::physical_memory();
2936
2937 if (total_memory < (julong)256*M) {
2938 jio_fprintf(defaultStream::error_stream(),
2939 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2940 vm_exit(1);
2941 }
2942
2943 // The heap size is half of available memory, or (at most)
2944 // all of possible memory less 160mb (leaving room for the OS
2945 // when using ISM). This is the maximum; because adaptive sizing
2946 // is turned on below, the actual space used may be smaller.
2947
2948 initHeapSize = MIN2(total_memory / (julong)2,
2949 total_memory - (julong)160*M);
2950
2951 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2952
2953 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2954 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2955 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2956 // Currently the minimum size and the initial heap sizes are the same.
2957 set_min_heap_size(initHeapSize);
2958 }
2959 if (FLAG_IS_DEFAULT(NewSize)) {
2960 // Make the young generation 3/8ths of the total heap.
2961 FLAG_SET_CMDLINE(uintx, NewSize,
2962 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2963 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2964 }
2965
2966 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2967 FLAG_SET_DEFAULT(UseLargePages, true);
2968 #endif
2969
2970 // Increase some data structure sizes for efficiency
2971 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2972 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2973 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2974
2975 // See the OldPLABSize comment below, but replace 'after promotion'
2976 // with 'after copying'. YoungPLABSize is the size of the survivor
2977 // space per-gc-thread buffers. The default is 4kw.
2978 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2979
2980 // OldPLABSize is the size of the buffers in the old gen that
2981 // UseParallelGC uses to promote live data that doesn't fit in the
2982 // survivor spaces. At any given time, there's one for each gc thread.
2983 // The default size is 1kw. These buffers are rarely used, since the
2984 // survivor spaces are usually big enough. For specjbb, however, there
2985 // are occasions when there's lots of live data in the young gen
2986 // and we end up promoting some of it. We don't have a definite
2987 // explanation for why bumping OldPLABSize helps, but the theory
2988 // is that a bigger PLAB results in retaining something like the
2989 // original allocation order after promotion, which improves mutator
2990 // locality. A minor effect may be that larger PLABs reduce the
2991 // number of PLAB allocation events during gc. The value of 8kw
2992 // was arrived at by experimenting with specjbb.
2993 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2994
2995 // Enable parallel GC and adaptive generation sizing
2996 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2997 FLAG_SET_DEFAULT(ParallelGCThreads,
2998 Abstract_VM_Version::parallel_worker_threads());
2999
3000 // Encourage steady state memory management
3001 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3002
3003 // This appears to improve mutator locality
3004 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3005
3006 // Get around early Solaris scheduling bug
3007 // (affinity vs other jobs on system)
3008 // but disallow DR and offlining (5008695).
3009 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3010
3011 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3012 // The last option must always win.
3013 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3014 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3015 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3016 // The last option must always win.
3017 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3018 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3019 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3020 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3021 jio_fprintf(defaultStream::error_stream(),
3022 "Please use CMSClassUnloadingEnabled in place of "
3023 "CMSPermGenSweepingEnabled in the future\n");
3024 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3025 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3026 jio_fprintf(defaultStream::error_stream(),
3027 "Please use -XX:+UseGCOverheadLimit in place of "
3028 "-XX:+UseGCTimeLimit in the future\n");
3029 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3030 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3031 jio_fprintf(defaultStream::error_stream(),
3032 "Please use -XX:-UseGCOverheadLimit in place of "
3033 "-XX:-UseGCTimeLimit in the future\n");
3034 // The TLE options are for compatibility with 1.3 and will be
3035 // removed without notice in a future release. These options
3036 // are not to be documented.
3037 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3038 // No longer used.
3039 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3040 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3041 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3042 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3043 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3044 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3045 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3046 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3047 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3048 // No longer used.
3049 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3050 julong long_tlab_size = 0;
3051 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3052 if (errcode != arg_in_range) {
3053 jio_fprintf(defaultStream::error_stream(),
3054 "Invalid TLAB size: %s\n", option->optionString);
3055 describe_range_error(errcode);
3056 return JNI_EINVAL;
3057 }
3058 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3059 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3060 // No longer used.
3061 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3062 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3063 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3064 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3065 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3066 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3067 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3068 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3069 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3070 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3071 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3072 #if defined(DTRACE_ENABLED)
3073 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3074 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3075 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3076 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3077 #else // defined(DTRACE_ENABLED)
3078 jio_fprintf(defaultStream::error_stream(),
3079 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3080 return JNI_EINVAL;
3081 #endif // defined(DTRACE_ENABLED)
3082 #ifdef ASSERT
3083 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3084 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3085 // disable scavenge before parallel mark-compact
3086 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3087 #endif
3088 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3089 julong cms_blocks_to_claim = (julong)atol(tail);
3090 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3091 jio_fprintf(defaultStream::error_stream(),
3092 "Please use -XX:OldPLABSize in place of "
3093 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3094 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3095 julong cms_blocks_to_claim = (julong)atol(tail);
3096 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3097 jio_fprintf(defaultStream::error_stream(),
3098 "Please use -XX:OldPLABSize in place of "
3099 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3100 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3101 julong old_plab_size = 0;
3102 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3103 if (errcode != arg_in_range) {
3104 jio_fprintf(defaultStream::error_stream(),
3105 "Invalid old PLAB size: %s\n", option->optionString);
3106 describe_range_error(errcode);
3107 return JNI_EINVAL;
3108 }
3109 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3110 jio_fprintf(defaultStream::error_stream(),
3111 "Please use -XX:OldPLABSize in place of "
3112 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3113 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3114 julong young_plab_size = 0;
3115 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3116 if (errcode != arg_in_range) {
3117 jio_fprintf(defaultStream::error_stream(),
3118 "Invalid young PLAB size: %s\n", option->optionString);
3119 describe_range_error(errcode);
3120 return JNI_EINVAL;
3121 }
3122 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3123 jio_fprintf(defaultStream::error_stream(),
3124 "Please use -XX:YoungPLABSize in place of "
3125 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3126 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3127 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3128 julong stack_size = 0;
3129 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3130 if (errcode != arg_in_range) {
3131 jio_fprintf(defaultStream::error_stream(),
3132 "Invalid mark stack size: %s\n", option->optionString);
3133 describe_range_error(errcode);
3134 return JNI_EINVAL;
3135 }
3136 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3137 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3138 julong max_stack_size = 0;
3139 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3140 if (errcode != arg_in_range) {
3141 jio_fprintf(defaultStream::error_stream(),
3142 "Invalid maximum mark stack size: %s\n",
3143 option->optionString);
3144 describe_range_error(errcode);
3145 return JNI_EINVAL;
3146 }
3147 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3148 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3149 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3150 uintx conc_threads = 0;
3151 if (!parse_uintx(tail, &conc_threads, 1)) {
3152 jio_fprintf(defaultStream::error_stream(),
3153 "Invalid concurrent threads: %s\n", option->optionString);
3154 return JNI_EINVAL;
3155 }
3156 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3157 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3158 julong max_direct_memory_size = 0;
3159 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3160 if (errcode != arg_in_range) {
3161 jio_fprintf(defaultStream::error_stream(),
3162 "Invalid maximum direct memory size: %s\n",
3163 option->optionString);
3164 describe_range_error(errcode);
3165 return JNI_EINVAL;
3166 }
3167 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3168 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3169 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3170 // away and will cause VM initialization failures!
3171 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3172 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3173 #if !INCLUDE_MANAGEMENT
3174 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3175 jio_fprintf(defaultStream::error_stream(),
3176 "ManagementServer is not supported in this VM.\n");
3177 return JNI_ERR;
3178 #endif // INCLUDE_MANAGEMENT
3179 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3180 // Skip -XX:Flags= since that case has already been handled
3181 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3182 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3183 return JNI_EINVAL;
3184 }
3185 }
3186 // Unknown option
3187 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3188 return JNI_ERR;
3189 }
3190 }
3191
3192 // Change the default value for flags which have different default values
3193 // when working with older JDKs.
3194 #ifdef LINUX
3195 if (JDK_Version::current().compare_major(6) <= 0 &&
3196 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3197 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3198 }
3199 #endif // LINUX
3200 return JNI_OK;
3201 }
3202
3203 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3204 // This must be done after all -D arguments have been processed.
3205 scp_p->expand_endorsed();
3206
3207 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3208 // Assemble the bootclasspath elements into the final path.
3209 Arguments::set_sysclasspath(scp_p->combined_path());
3210 }
3211
3212 // This must be done after all arguments have been processed.
3213 // java_compiler() true means set to "NONE" or empty.
3214 if (java_compiler() && !xdebug_mode()) {
3215 // For backwards compatibility, we switch to interpreted mode if
3216 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3217 // not specified.
3218 set_mode_flags(_int);
3219 }
3220 if (CompileThreshold == 0) {
3221 set_mode_flags(_int);
3222 }
3223
3224 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3225 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3226 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3227 }
3228
3229 #ifndef COMPILER2
3230 // Don't degrade server performance for footprint
3231 if (FLAG_IS_DEFAULT(UseLargePages) &&
3232 MaxHeapSize < LargePageHeapSizeThreshold) {
3233 // No need for large granularity pages w/small heaps.
3234 // Note that large pages are enabled/disabled for both the
3235 // Java heap and the code cache.
3236 FLAG_SET_DEFAULT(UseLargePages, false);
3237 }
3238
3239 #else
3240 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3241 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3242 }
3243 #endif
3244
3245 #ifndef TIERED
3246 // Tiered compilation is undefined.
3247 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3248 #endif
3249
3250 // If we are running in a headless jre, force java.awt.headless property
3251 // to be true unless the property has already been set.
3252 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3253 if (os::is_headless_jre()) {
3254 const char* headless = Arguments::get_property("java.awt.headless");
3255 if (headless == NULL) {
3256 char envbuffer[128];
3257 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3258 if (!add_property("java.awt.headless=true")) {
3259 return JNI_ENOMEM;
3260 }
3261 } else {
3262 char buffer[256];
3263 strcpy(buffer, "java.awt.headless=");
3264 strcat(buffer, envbuffer);
3265 if (!add_property(buffer)) {
3266 return JNI_ENOMEM;
3267 }
3268 }
3269 }
3270 }
3271
3272 if (!check_vm_args_consistency()) {
3273 return JNI_ERR;
3274 }
3275
3276 return JNI_OK;
3277 }
3278
3279 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3280 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3281 scp_assembly_required_p);
3282 }
3283
3284 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3285 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3286 scp_assembly_required_p);
3287 }
3288
3289 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3290 const int N_MAX_OPTIONS = 64;
3291 const int OPTION_BUFFER_SIZE = 1024;
3292 char buffer[OPTION_BUFFER_SIZE];
3293
3294 // The variable will be ignored if it exceeds the length of the buffer.
3295 // Don't check this variable if user has special privileges
3296 // (e.g. unix su command).
3297 if (os::getenv(name, buffer, sizeof(buffer)) &&
3298 !os::have_special_privileges()) {
3299 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3300 jio_fprintf(defaultStream::error_stream(),
3301 "Picked up %s: %s\n", name, buffer);
3302 char* rd = buffer; // pointer to the input string (rd)
3303 int i;
3304 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3305 while (isspace(*rd)) rd++; // skip whitespace
3306 if (*rd == 0) break; // we re done when the input string is read completely
3307
3308 // The output, option string, overwrites the input string.
3309 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3310 // input string (rd).
3311 char* wrt = rd;
3312
3313 options[i++].optionString = wrt; // Fill in option
3314 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3315 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3316 int quote = *rd; // matching quote to look for
3317 rd++; // don't copy open quote
3318 while (*rd != quote) { // include everything (even spaces) up until quote
3319 if (*rd == 0) { // string termination means unmatched string
3320 jio_fprintf(defaultStream::error_stream(),
3321 "Unmatched quote in %s\n", name);
3322 return JNI_ERR;
3323 }
3324 *wrt++ = *rd++; // copy to option string
3325 }
3326 rd++; // don't copy close quote
3327 } else {
3328 *wrt++ = *rd++; // copy to option string
3329 }
3330 }
3331 // Need to check if we're done before writing a NULL,
3332 // because the write could be to the byte that rd is pointing to.
3333 if (*rd++ == 0) {
3334 *wrt = 0;
3335 break;
3336 }
3337 *wrt = 0; // Zero terminate option
3338 }
3339 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3340 JavaVMInitArgs vm_args;
3341 vm_args.version = JNI_VERSION_1_2;
3342 vm_args.options = options;
3343 vm_args.nOptions = i;
3344 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3345
3346 if (PrintVMOptions) {
3347 const char* tail;
3348 for (int i = 0; i < vm_args.nOptions; i++) {
3349 const JavaVMOption *option = vm_args.options + i;
3350 if (match_option(option, "-XX:", &tail)) {
3351 logOption(tail);
3352 }
3353 }
3354 }
3355
3356 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3357 }
3358 return JNI_OK;
3359 }
3360
3361 void Arguments::set_shared_spaces_flags() {
3362 if (DumpSharedSpaces) {
3363 if (RequireSharedSpaces) {
3364 warning("cannot dump shared archive while using shared archive");
3365 }
3366 UseSharedSpaces = false;
3367 #ifdef _LP64
3368 if (!UseCompressedOops || !UseCompressedClassPointers) {
3369 vm_exit_during_initialization(
3370 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3371 }
3372 } else {
3373 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.
3374 if (!UseCompressedOops || !UseCompressedClassPointers) {
3375 no_shared_spaces();
3376 }
3377 #endif
3378 }
3379 }
3380
3381 #if !INCLUDE_ALL_GCS
3382 static void force_serial_gc() {
3383 FLAG_SET_DEFAULT(UseSerialGC, true);
3384 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3385 UNSUPPORTED_GC_OPTION(UseG1GC);
3386 UNSUPPORTED_GC_OPTION(UseParallelGC);
3387 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3388 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3389 UNSUPPORTED_GC_OPTION(UseParNewGC);
3390 }
3391 #endif // INCLUDE_ALL_GCS
3392
3393 // Sharing support
3394 // Construct the path to the archive
3395 static char* get_shared_archive_path() {
3396 char *shared_archive_path;
3397 if (SharedArchiveFile == NULL) {
3398 char jvm_path[JVM_MAXPATHLEN];
3399 os::jvm_path(jvm_path, sizeof(jvm_path));
3400 char *end = strrchr(jvm_path, *os::file_separator());
3401 if (end != NULL) *end = '\0';
3402 size_t jvm_path_len = strlen(jvm_path);
3403 size_t file_sep_len = strlen(os::file_separator());
3404 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3405 file_sep_len + 20, mtInternal);
3406 if (shared_archive_path != NULL) {
3407 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3408 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3409 strncat(shared_archive_path, "classes.jsa", 11);
3410 }
3411 } else {
3412 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3413 if (shared_archive_path != NULL) {
3414 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3415 }
3416 }
3417 return shared_archive_path;
3418 }
3419
3420 #ifndef PRODUCT
3421 // Determine whether LogVMOutput should be implicitly turned on.
3422 static bool use_vm_log() {
3423 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3424 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3425 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3426 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3427 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3428 return true;
3429 }
3430
3431 #ifdef COMPILER1
3432 if (PrintC1Statistics) {
3433 return true;
3434 }
3435 #endif // COMPILER1
3436
3437 #ifdef COMPILER2
3438 if (PrintOptoAssembly || PrintOptoStatistics) {
3439 return true;
3440 }
3441 #endif // COMPILER2
3442
3443 return false;
3444 }
3445 #endif // PRODUCT
3446
3447 // Parse entry point called from JNI_CreateJavaVM
3448
3449 jint Arguments::parse(const JavaVMInitArgs* args) {
3450
3451 // Remaining part of option string
3452 const char* tail;
3453
3454 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3455 const char* hotspotrc = ".hotspotrc";
3456 bool settings_file_specified = false;
3457 bool needs_hotspotrc_warning = false;
3458
3459 const char* flags_file;
3460 int index;
3461 for (index = 0; index < args->nOptions; index++) {
3462 const JavaVMOption *option = args->options + index;
3463 if (match_option(option, "-XX:Flags=", &tail)) {
3464 flags_file = tail;
3465 settings_file_specified = true;
3466 }
3467 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3468 PrintVMOptions = true;
3469 }
3470 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3471 PrintVMOptions = false;
3472 }
3473 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3474 IgnoreUnrecognizedVMOptions = true;
3475 }
3476 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3477 IgnoreUnrecognizedVMOptions = false;
3478 }
3479 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3480 CommandLineFlags::printFlags(tty, false);
3481 vm_exit(0);
3482 }
3483 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3484 #if INCLUDE_NMT
3485 MemTracker::init_tracking_options(tail);
3486 #else
3487 jio_fprintf(defaultStream::error_stream(),
3488 "Native Memory Tracking is not supported in this VM\n");
3489 return JNI_ERR;
3490 #endif
3491 }
3492
3493
3494 #ifndef PRODUCT
3495 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3496 CommandLineFlags::printFlags(tty, true);
3497 vm_exit(0);
3498 }
3499 #endif
3500 }
3501
3502 if (IgnoreUnrecognizedVMOptions) {
3503 // uncast const to modify the flag args->ignoreUnrecognized
3504 *(jboolean*)(&args->ignoreUnrecognized) = true;
3505 }
3506
3507 // Parse specified settings file
3508 if (settings_file_specified) {
3509 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3510 return JNI_EINVAL;
3511 }
3512 } else {
3513 #ifdef ASSERT
3514 // Parse default .hotspotrc settings file
3515 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3516 return JNI_EINVAL;
3517 }
3518 #else
3519 struct stat buf;
3520 if (os::stat(hotspotrc, &buf) == 0) {
3521 needs_hotspotrc_warning = true;
3522 }
3523 #endif
3524 }
3525
3526 if (PrintVMOptions) {
3527 for (index = 0; index < args->nOptions; index++) {
3528 const JavaVMOption *option = args->options + index;
3529 if (match_option(option, "-XX:", &tail)) {
3530 logOption(tail);
3531 }
3532 }
3533 }
3534
3535 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3536 jint result = parse_vm_init_args(args);
3537 if (result != JNI_OK) {
3538 return result;
3539 }
3540
3541 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3542 SharedArchivePath = get_shared_archive_path();
3543 if (SharedArchivePath == NULL) {
3544 return JNI_ENOMEM;
3545 }
3546
3547 // Delay warning until here so that we've had a chance to process
3548 // the -XX:-PrintWarnings flag
3549 if (needs_hotspotrc_warning) {
3550 warning("%s file is present but has been ignored. "
3551 "Run with -XX:Flags=%s to load the file.",
3552 hotspotrc, hotspotrc);
3553 }
3554
3555 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3556 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3557 #endif
3558
3559 #if INCLUDE_ALL_GCS
3560 #if (defined JAVASE_EMBEDDED || defined ARM)
3561 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3562 #endif
3563 #endif
3564
3565 #ifndef PRODUCT
3566 if (TraceBytecodesAt != 0) {
3567 TraceBytecodes = true;
3568 }
3569 if (CountCompiledCalls) {
3570 if (UseCounterDecay) {
3571 warning("UseCounterDecay disabled because CountCalls is set");
3572 UseCounterDecay = false;
3573 }
3574 }
3575 #endif // PRODUCT
3576
3577 // JSR 292 is not supported before 1.7
3578 if (!JDK_Version::is_gte_jdk17x_version()) {
3579 if (EnableInvokeDynamic) {
3580 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3581 warning("JSR 292 is not supported before 1.7. Disabling support.");
3582 }
3583 EnableInvokeDynamic = false;
3584 }
3585 }
3586
3587 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3588 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3589 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3590 }
3591 ScavengeRootsInCode = 1;
3592 }
3593
3594 if (PrintGCDetails) {
3595 // Turn on -verbose:gc options as well
3596 PrintGC = true;
3597 }
3598
3599 if (!JDK_Version::is_gte_jdk18x_version()) {
3600 // To avoid changing the log format for 7 updates this flag is only
3601 // true by default in JDK8 and above.
3602 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3603 FLAG_SET_DEFAULT(PrintGCCause, false);
3604 }
3605 }
3606
3607 // Set object alignment values.
3608 set_object_alignment();
3609
3610 #if !INCLUDE_ALL_GCS
3611 force_serial_gc();
3612 #endif // INCLUDE_ALL_GCS
3613 #if !INCLUDE_CDS
3614 if (DumpSharedSpaces || RequireSharedSpaces) {
3615 jio_fprintf(defaultStream::error_stream(),
3616 "Shared spaces are not supported in this VM\n");
3617 return JNI_ERR;
3618 }
3619 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3620 warning("Shared spaces are not supported in this VM");
3621 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3622 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3623 }
3624 no_shared_spaces();
3625 #endif // INCLUDE_CDS
3626
3627 return JNI_OK;
3628 }
3629
3630 jint Arguments::apply_ergo() {
3631
3632 // Set flags based on ergonomics.
3633 set_ergonomics_flags();
3634
3635 set_shared_spaces_flags();
3636
3637 // Check the GC selections again.
3638 if (!check_gc_consistency()) {
3639 return JNI_EINVAL;
3640 }
3641
3642 if (TieredCompilation) {
3643 set_tiered_flags();
3644 } else {
3645 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3646 if (CompilationPolicyChoice >= 2) {
3647 vm_exit_during_initialization(
3648 "Incompatible compilation policy selected", NULL);
3649 }
3650 }
3651 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
3652 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3653 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
3654 }
3655
3656
3657 // Set heap size based on available physical memory
3658 set_heap_size();
3659
3660 #if INCLUDE_ALL_GCS
3661 // Set per-collector flags
3662 if (UseParallelGC || UseParallelOldGC) {
3663 set_parallel_gc_flags();
3664 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3665 set_cms_and_parnew_gc_flags();
3666 } else if (UseParNewGC) { // skipped if CMS is set above
3667 set_parnew_gc_flags();
3668 } else if (UseG1GC) {
3669 set_g1_gc_flags();
3670 }
3671 check_deprecated_gcs();
3672 check_deprecated_gc_flags();
3673 if (AssumeMP && !UseSerialGC) {
3674 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3675 warning("If the number of processors is expected to increase from one, then"
3676 " you should configure the number of parallel GC threads appropriately"
3677 " using -XX:ParallelGCThreads=N");
3678 }
3679 }
3680 #else // INCLUDE_ALL_GCS
3681 assert(verify_serial_gc_flags(), "SerialGC unset");
3682 #endif // INCLUDE_ALL_GCS
3683
3684 // Initialize Metaspace flags and alignments.
3685 Metaspace::ergo_initialize();
3686
3687 // Set bytecode rewriting flags
3688 set_bytecode_flags();
3689
3690 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3691 set_aggressive_opts_flags();
3692
3693 // Turn off biased locking for locking debug mode flags,
3694 // which are subtlely different from each other but neither works with
3695 // biased locking.
3696 if (UseHeavyMonitors
3697 #ifdef COMPILER1
3698 || !UseFastLocking
3699 #endif // COMPILER1
3700 ) {
3701 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3702 // flag set to true on command line; warn the user that they
3703 // can't enable biased locking here
3704 warning("Biased Locking is not supported with locking debug flags"
3705 "; ignoring UseBiasedLocking flag." );
3706 }
3707 UseBiasedLocking = false;
3708 }
3709
3710 #ifdef ZERO
3711 // Clear flags not supported on zero.
3712 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3713 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3714 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3715 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3716 #endif // CC_INTERP
3717
3718 #ifdef COMPILER2
3719 if (!UseBiasedLocking || EmitSync != 0) {
3720 UseOptoBiasInlining = false;
3721 }
3722 if (!EliminateLocks) {
3723 EliminateNestedLocks = false;
3724 }
3725 if (!Inline) {
3726 IncrementalInline = false;
3727 }
3728 #ifndef PRODUCT
3729 if (!IncrementalInline) {
3730 AlwaysIncrementalInline = false;
3731 }
3732 #endif
3733 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3734 // incremental inlining: bump MaxNodeLimit
3735 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3736 }
3737 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3738 // nothing to use the profiling, turn if off
3739 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3740 }
3741 if (UseTypeSpeculation && FLAG_IS_DEFAULT(ReplaceInParentMaps)) {
3742 // Doing the replace in parent maps helps speculation
3743 FLAG_SET_DEFAULT(ReplaceInParentMaps, true);
3744 }
3745 #endif
3746
3747 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3748 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3749 DebugNonSafepoints = true;
3750 }
3751
3752 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3753 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3754 }
3755
3756 #ifndef PRODUCT
3757 if (CompileTheWorld) {
3758 // Force NmethodSweeper to sweep whole CodeCache each time.
3759 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3760 NmethodSweepFraction = 1;
3761 }
3762 }
3763
3764 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3765 if (use_vm_log()) {
3766 LogVMOutput = true;
3767 }
3768 }
3769 #endif // PRODUCT
3770
3771 if (PrintCommandLineFlags) {
3772 CommandLineFlags::printSetFlags(tty);
3773 }
3774
3775 // Apply CPU specific policy for the BiasedLocking
3776 if (UseBiasedLocking) {
3777 if (!VM_Version::use_biased_locking() &&
3778 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3779 UseBiasedLocking = false;
3780 }
3781 }
3782
3783 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3784 // but only if not already set on the commandline
3785 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3786 bool set = false;
3787 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3788 if (!set) {
3789 FLAG_SET_DEFAULT(PauseAtExit, true);
3790 }
3791 }
3792
3793 return JNI_OK;
3794 }
3795
3796 jint Arguments::adjust_after_os() {
3797 #if INCLUDE_ALL_GCS
3798 if (UseParallelGC || UseParallelOldGC) {
3799 if (UseNUMA) {
3800 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3801 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3802 }
3803 // For those collectors or operating systems (eg, Windows) that do
3804 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3805 UseNUMAInterleaving = true;
3806 }
3807 }
3808 #endif // INCLUDE_ALL_GCS
3809 return JNI_OK;
3810 }
3811
3812 int Arguments::PropertyList_count(SystemProperty* pl) {
3813 int count = 0;
3814 while(pl != NULL) {
3815 count++;
3816 pl = pl->next();
3817 }
3818 return count;
3819 }
3820
3821 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3822 assert(key != NULL, "just checking");
3823 SystemProperty* prop;
3824 for (prop = pl; prop != NULL; prop = prop->next()) {
3825 if (strcmp(key, prop->key()) == 0) return prop->value();
3826 }
3827 return NULL;
3828 }
3829
3830 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3831 int count = 0;
3832 const char* ret_val = NULL;
3833
3834 while(pl != NULL) {
3835 if(count >= index) {
3836 ret_val = pl->key();
3837 break;
3838 }
3839 count++;
3840 pl = pl->next();
3841 }
3842
3843 return ret_val;
3844 }
3845
3846 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3847 int count = 0;
3848 char* ret_val = NULL;
3849
3850 while(pl != NULL) {
3851 if(count >= index) {
3852 ret_val = pl->value();
3853 break;
3854 }
3855 count++;
3856 pl = pl->next();
3857 }
3858
3859 return ret_val;
3860 }
3861
3862 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3863 SystemProperty* p = *plist;
3864 if (p == NULL) {
3865 *plist = new_p;
3866 } else {
3867 while (p->next() != NULL) {
3868 p = p->next();
3869 }
3870 p->set_next(new_p);
3871 }
3872 }
3873
3874 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3875 if (plist == NULL)
3876 return;
3877
3878 SystemProperty* new_p = new SystemProperty(k, v, true);
3879 PropertyList_add(plist, new_p);
3880 }
3881
3882 // This add maintains unique property key in the list.
3883 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3884 if (plist == NULL)
3885 return;
3886
3887 // If property key exist then update with new value.
3888 SystemProperty* prop;
3889 for (prop = *plist; prop != NULL; prop = prop->next()) {
3890 if (strcmp(k, prop->key()) == 0) {
3891 if (append) {
3892 prop->append_value(v);
3893 } else {
3894 prop->set_value(v);
3895 }
3896 return;
3897 }
3898 }
3899
3900 PropertyList_add(plist, k, v);
3901 }
3902
3903 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3904 // Returns true if all of the source pointed by src has been copied over to
3905 // the destination buffer pointed by buf. Otherwise, returns false.
3906 // Notes:
3907 // 1. If the length (buflen) of the destination buffer excluding the
3908 // NULL terminator character is not long enough for holding the expanded
3909 // pid characters, it also returns false instead of returning the partially
3910 // expanded one.
3911 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3912 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3913 char* buf, size_t buflen) {
3914 const char* p = src;
3915 char* b = buf;
3916 const char* src_end = &src[srclen];
3917 char* buf_end = &buf[buflen - 1];
3918
3919 while (p < src_end && b < buf_end) {
3920 if (*p == '%') {
3921 switch (*(++p)) {
3922 case '%': // "%%" ==> "%"
3923 *b++ = *p++;
3924 break;
3925 case 'p': { // "%p" ==> current process id
3926 // buf_end points to the character before the last character so
3927 // that we could write '\0' to the end of the buffer.
3928 size_t buf_sz = buf_end - b + 1;
3929 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3930
3931 // if jio_snprintf fails or the buffer is not long enough to hold
3932 // the expanded pid, returns false.
3933 if (ret < 0 || ret >= (int)buf_sz) {
3934 return false;
3935 } else {
3936 b += ret;
3937 assert(*b == '\0', "fail in copy_expand_pid");
3938 if (p == src_end && b == buf_end + 1) {
3939 // reach the end of the buffer.
3940 return true;
3941 }
3942 }
3943 p++;
3944 break;
3945 }
3946 default :
3947 *b++ = '%';
3948 }
3949 } else {
3950 *b++ = *p++;
3951 }
3952 }
3953 *b = '\0';
3954 return (p == src_end); // return false if not all of the source was copied
3955 }