1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaAssertions.hpp"
27 #include "classfile/stringTable.hpp"
28 #include "classfile/symbolTable.hpp"
29 #include "compiler/compilerOracle.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/cardTableRS.hpp"
32 #include "memory/genCollectedHeap.hpp"
33 #include "memory/referenceProcessor.hpp"
34 #include "memory/universe.inline.hpp"
35 #include "oops/oop.inline.hpp"
36 #include "prims/jvmtiExport.hpp"
37 #include "runtime/arguments.hpp"
38 #include "runtime/globals_extension.hpp"
39 #include "runtime/java.hpp"
40 #include "services/management.hpp"
41 #include "services/memTracker.hpp"
42 #include "utilities/defaultStream.hpp"
43 #include "utilities/macros.hpp"
44 #include "utilities/taskqueue.hpp"
45 #ifdef TARGET_OS_FAMILY_linux
46 # include "os_linux.inline.hpp"
47 #endif
48 #ifdef TARGET_OS_FAMILY_solaris
49 # include "os_solaris.inline.hpp"
50 #endif
51 #ifdef TARGET_OS_FAMILY_windows
52 # include "os_windows.inline.hpp"
53 #endif
54 #ifdef TARGET_OS_FAMILY_aix
55 # include "os_aix.inline.hpp"
56 #endif
57 #ifdef TARGET_OS_FAMILY_bsd
58 # include "os_bsd.inline.hpp"
59 #endif
60 #if INCLUDE_ALL_GCS
61 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
62 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
63 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
64 #endif // INCLUDE_ALL_GCS
65
66 // Note: This is a special bug reporting site for the JVM
67 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
68 #define DEFAULT_JAVA_LAUNCHER "generic"
69
70 // Disable options not supported in this release, with a warning if they
71 // were explicitly requested on the command-line
72 #define UNSUPPORTED_OPTION(opt, description) \
73 do { \
74 if (opt) { \
75 if (FLAG_IS_CMDLINE(opt)) { \
76 warning(description " is disabled in this release."); \
77 } \
78 FLAG_SET_DEFAULT(opt, false); \
79 } \
80 } while(0)
81
82 #define UNSUPPORTED_GC_OPTION(gc) \
83 do { \
84 if (gc) { \
85 if (FLAG_IS_CMDLINE(gc)) { \
86 warning(#gc " is not supported in this VM. Using Serial GC."); \
87 } \
88 FLAG_SET_DEFAULT(gc, false); \
89 } \
90 } while(0)
91
92 char** Arguments::_jvm_flags_array = NULL;
93 int Arguments::_num_jvm_flags = 0;
94 char** Arguments::_jvm_args_array = NULL;
95 int Arguments::_num_jvm_args = 0;
96 char* Arguments::_java_command = NULL;
97 SystemProperty* Arguments::_system_properties = NULL;
98 const char* Arguments::_gc_log_filename = NULL;
99 bool Arguments::_has_profile = false;
100 size_t Arguments::_conservative_max_heap_alignment = 0;
101 uintx Arguments::_min_heap_size = 0;
102 Arguments::Mode Arguments::_mode = _mixed;
103 bool Arguments::_java_compiler = false;
104 bool Arguments::_xdebug_mode = false;
105 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
106 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
107 int Arguments::_sun_java_launcher_pid = -1;
108 bool Arguments::_sun_java_launcher_is_altjvm = false;
109
110 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
111 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
112 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
113 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
114 bool Arguments::_ClipInlining = ClipInlining;
115
116 char* Arguments::SharedArchivePath = NULL;
117
118 AgentLibraryList Arguments::_libraryList;
119 AgentLibraryList Arguments::_agentList;
120
121 abort_hook_t Arguments::_abort_hook = NULL;
122 exit_hook_t Arguments::_exit_hook = NULL;
123 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
124
125
126 SystemProperty *Arguments::_java_ext_dirs = NULL;
127 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
128 SystemProperty *Arguments::_sun_boot_library_path = NULL;
129 SystemProperty *Arguments::_java_library_path = NULL;
130 SystemProperty *Arguments::_java_home = NULL;
131 SystemProperty *Arguments::_java_class_path = NULL;
132 SystemProperty *Arguments::_sun_boot_class_path = NULL;
133
134 char* Arguments::_meta_index_path = NULL;
135 char* Arguments::_meta_index_dir = NULL;
136
137 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
138
139 static bool match_option(const JavaVMOption *option, const char* name,
140 const char** tail) {
141 int len = (int)strlen(name);
142 if (strncmp(option->optionString, name, len) == 0) {
143 *tail = option->optionString + len;
144 return true;
145 } else {
146 return false;
147 }
148 }
149
150 static void logOption(const char* opt) {
151 if (PrintVMOptions) {
152 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
153 }
154 }
155
156 // Process java launcher properties.
157 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
158 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
159 // sun.java.launcher.pid is defined.
160 // Must do this before setting up other system properties,
161 // as some of them may depend on launcher type.
162 for (int index = 0; index < args->nOptions; index++) {
163 const JavaVMOption* option = args->options + index;
164 const char* tail;
165
166 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
167 process_java_launcher_argument(tail, option->extraInfo);
168 continue;
169 }
170 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
171 if (strcmp(tail, "true") == 0) {
172 _sun_java_launcher_is_altjvm = true;
173 }
174 continue;
175 }
176 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
177 _sun_java_launcher_pid = atoi(tail);
178 continue;
179 }
180 }
181 }
182
183 // Initialize system properties key and value.
184 void Arguments::init_system_properties() {
185
186 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
187 "Java Virtual Machine Specification", false));
188 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
189 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
190 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
191
192 // Following are JVMTI agent writable properties.
193 // Properties values are set to NULL and they are
194 // os specific they are initialized in os::init_system_properties_values().
195 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
196 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
197 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
198 _java_library_path = new SystemProperty("java.library.path", NULL, true);
199 _java_home = new SystemProperty("java.home", NULL, true);
200 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
201
202 _java_class_path = new SystemProperty("java.class.path", "", true);
203
204 // Add to System Property list.
205 PropertyList_add(&_system_properties, _java_ext_dirs);
206 PropertyList_add(&_system_properties, _java_endorsed_dirs);
207 PropertyList_add(&_system_properties, _sun_boot_library_path);
208 PropertyList_add(&_system_properties, _java_library_path);
209 PropertyList_add(&_system_properties, _java_home);
210 PropertyList_add(&_system_properties, _java_class_path);
211 PropertyList_add(&_system_properties, _sun_boot_class_path);
212
213 // Set OS specific system properties values
214 os::init_system_properties_values();
215 }
216
217
218 // Update/Initialize System properties after JDK version number is known
219 void Arguments::init_version_specific_system_properties() {
220 enum { bufsz = 16 };
221 char buffer[bufsz];
222 const char* spec_vendor = "Sun Microsystems Inc.";
223 uint32_t spec_version = 0;
224
225 if (JDK_Version::is_gte_jdk17x_version()) {
226 spec_vendor = "Oracle Corporation";
227 spec_version = JDK_Version::current().major_version();
228 }
229 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
230
231 PropertyList_add(&_system_properties,
232 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
233 PropertyList_add(&_system_properties,
234 new SystemProperty("java.vm.specification.version", buffer, false));
235 PropertyList_add(&_system_properties,
236 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
237 }
238
239 /**
240 * Provide a slightly more user-friendly way of eliminating -XX flags.
241 * When a flag is eliminated, it can be added to this list in order to
242 * continue accepting this flag on the command-line, while issuing a warning
243 * and ignoring the value. Once the JDK version reaches the 'accept_until'
244 * limit, we flatly refuse to admit the existence of the flag. This allows
245 * a flag to die correctly over JDK releases using HSX.
246 */
247 typedef struct {
248 const char* name;
249 JDK_Version obsoleted_in; // when the flag went away
250 JDK_Version accept_until; // which version to start denying the existence
251 } ObsoleteFlag;
252
253 static ObsoleteFlag obsolete_jvm_flags[] = {
254 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
255 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
256 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
257 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
258 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
259 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
260 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
261 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
262 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
263 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
264 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
265 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
266 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
267 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
268 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
269 { "DefaultInitialRAMFraction",
270 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
271 { "UseDepthFirstScavengeOrder",
272 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
273 { "HandlePromotionFailure",
274 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
275 { "MaxLiveObjectEvacuationRatio",
276 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
277 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
278 { "UseParallelOldGCCompacting",
279 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
280 { "UseParallelDensePrefixUpdate",
281 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
282 { "UseParallelOldGCDensePrefix",
283 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
284 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
285 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
286 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
293 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
294 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
295 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
296 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
297 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
298 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
299 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
300 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
301 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
302 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
303 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
304 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
305 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
306 #ifdef PRODUCT
307 { "DesiredMethodLimit",
308 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
309 #endif // PRODUCT
310 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) },
311 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
312 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
313 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
314 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) },
315 { NULL, JDK_Version(0), JDK_Version(0) }
316 };
317
318 // Returns true if the flag is obsolete and fits into the range specified
319 // for being ignored. In the case that the flag is ignored, the 'version'
320 // value is filled in with the version number when the flag became
321 // obsolete so that that value can be displayed to the user.
322 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
323 int i = 0;
324 assert(version != NULL, "Must provide a version buffer");
325 while (obsolete_jvm_flags[i].name != NULL) {
326 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
327 // <flag>=xxx form
328 // [-|+]<flag> form
329 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
330 ((s[0] == '+' || s[0] == '-') &&
331 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
332 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
333 *version = flag_status.obsoleted_in;
334 return true;
335 }
336 }
337 i++;
338 }
339 return false;
340 }
341
342 // Constructs the system class path (aka boot class path) from the following
343 // components, in order:
344 //
345 // prefix // from -Xbootclasspath/p:...
346 // endorsed // the expansion of -Djava.endorsed.dirs=...
347 // base // from os::get_system_properties() or -Xbootclasspath=
348 // suffix // from -Xbootclasspath/a:...
349 //
350 // java.endorsed.dirs is a list of directories; any jar or zip files in the
351 // directories are added to the sysclasspath just before the base.
352 //
353 // This could be AllStatic, but it isn't needed after argument processing is
354 // complete.
355 class SysClassPath: public StackObj {
356 public:
357 SysClassPath(const char* base);
358 ~SysClassPath();
359
360 inline void set_base(const char* base);
361 inline void add_prefix(const char* prefix);
362 inline void add_suffix_to_prefix(const char* suffix);
363 inline void add_suffix(const char* suffix);
364 inline void reset_path(const char* base);
365
366 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
367 // property. Must be called after all command-line arguments have been
368 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
369 // combined_path().
370 void expand_endorsed();
371
372 inline const char* get_base() const { return _items[_scp_base]; }
373 inline const char* get_prefix() const { return _items[_scp_prefix]; }
374 inline const char* get_suffix() const { return _items[_scp_suffix]; }
375 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
376
377 // Combine all the components into a single c-heap-allocated string; caller
378 // must free the string if/when no longer needed.
379 char* combined_path();
380
381 private:
382 // Utility routines.
383 static char* add_to_path(const char* path, const char* str, bool prepend);
384 static char* add_jars_to_path(char* path, const char* directory);
385
386 inline void reset_item_at(int index);
387
388 // Array indices for the items that make up the sysclasspath. All except the
389 // base are allocated in the C heap and freed by this class.
390 enum {
391 _scp_prefix, // from -Xbootclasspath/p:...
392 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
393 _scp_base, // the default sysclasspath
394 _scp_suffix, // from -Xbootclasspath/a:...
395 _scp_nitems // the number of items, must be last.
396 };
397
398 const char* _items[_scp_nitems];
399 DEBUG_ONLY(bool _expansion_done;)
400 };
401
402 SysClassPath::SysClassPath(const char* base) {
403 memset(_items, 0, sizeof(_items));
404 _items[_scp_base] = base;
405 DEBUG_ONLY(_expansion_done = false;)
406 }
407
408 SysClassPath::~SysClassPath() {
409 // Free everything except the base.
410 for (int i = 0; i < _scp_nitems; ++i) {
411 if (i != _scp_base) reset_item_at(i);
412 }
413 DEBUG_ONLY(_expansion_done = false;)
414 }
415
416 inline void SysClassPath::set_base(const char* base) {
417 _items[_scp_base] = base;
418 }
419
420 inline void SysClassPath::add_prefix(const char* prefix) {
421 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
422 }
423
424 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
425 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
426 }
427
428 inline void SysClassPath::add_suffix(const char* suffix) {
429 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
430 }
431
432 inline void SysClassPath::reset_item_at(int index) {
433 assert(index < _scp_nitems && index != _scp_base, "just checking");
434 if (_items[index] != NULL) {
435 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
436 _items[index] = NULL;
437 }
438 }
439
440 inline void SysClassPath::reset_path(const char* base) {
441 // Clear the prefix and suffix.
442 reset_item_at(_scp_prefix);
443 reset_item_at(_scp_suffix);
444 set_base(base);
445 }
446
447 //------------------------------------------------------------------------------
448
449 void SysClassPath::expand_endorsed() {
450 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
451
452 const char* path = Arguments::get_property("java.endorsed.dirs");
453 if (path == NULL) {
454 path = Arguments::get_endorsed_dir();
455 assert(path != NULL, "no default for java.endorsed.dirs");
456 }
457
458 char* expanded_path = NULL;
459 const char separator = *os::path_separator();
460 const char* const end = path + strlen(path);
461 while (path < end) {
462 const char* tmp_end = strchr(path, separator);
463 if (tmp_end == NULL) {
464 expanded_path = add_jars_to_path(expanded_path, path);
465 path = end;
466 } else {
467 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
468 memcpy(dirpath, path, tmp_end - path);
469 dirpath[tmp_end - path] = '\0';
470 expanded_path = add_jars_to_path(expanded_path, dirpath);
471 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
472 path = tmp_end + 1;
473 }
474 }
475 _items[_scp_endorsed] = expanded_path;
476 DEBUG_ONLY(_expansion_done = true;)
477 }
478
479 // Combine the bootclasspath elements, some of which may be null, into a single
480 // c-heap-allocated string.
481 char* SysClassPath::combined_path() {
482 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
483 assert(_expansion_done, "must call expand_endorsed() first.");
484
485 size_t lengths[_scp_nitems];
486 size_t total_len = 0;
487
488 const char separator = *os::path_separator();
489
490 // Get the lengths.
491 int i;
492 for (i = 0; i < _scp_nitems; ++i) {
493 if (_items[i] != NULL) {
494 lengths[i] = strlen(_items[i]);
495 // Include space for the separator char (or a NULL for the last item).
496 total_len += lengths[i] + 1;
497 }
498 }
499 assert(total_len > 0, "empty sysclasspath not allowed");
500
501 // Copy the _items to a single string.
502 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
503 char* cp_tmp = cp;
504 for (i = 0; i < _scp_nitems; ++i) {
505 if (_items[i] != NULL) {
506 memcpy(cp_tmp, _items[i], lengths[i]);
507 cp_tmp += lengths[i];
508 *cp_tmp++ = separator;
509 }
510 }
511 *--cp_tmp = '\0'; // Replace the extra separator.
512 return cp;
513 }
514
515 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
516 char*
517 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
518 char *cp;
519
520 assert(str != NULL, "just checking");
521 if (path == NULL) {
522 size_t len = strlen(str) + 1;
523 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
524 memcpy(cp, str, len); // copy the trailing null
525 } else {
526 const char separator = *os::path_separator();
527 size_t old_len = strlen(path);
528 size_t str_len = strlen(str);
529 size_t len = old_len + str_len + 2;
530
531 if (prepend) {
532 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
533 char* cp_tmp = cp;
534 memcpy(cp_tmp, str, str_len);
535 cp_tmp += str_len;
536 *cp_tmp = separator;
537 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
538 FREE_C_HEAP_ARRAY(char, path, mtInternal);
539 } else {
540 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
541 char* cp_tmp = cp + old_len;
542 *cp_tmp = separator;
543 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
544 }
545 }
546 return cp;
547 }
548
549 // Scan the directory and append any jar or zip files found to path.
550 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
551 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
552 DIR* dir = os::opendir(directory);
553 if (dir == NULL) return path;
554
555 char dir_sep[2] = { '\0', '\0' };
556 size_t directory_len = strlen(directory);
557 const char fileSep = *os::file_separator();
558 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
559
560 /* Scan the directory for jars/zips, appending them to path. */
561 struct dirent *entry;
562 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
563 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
564 const char* name = entry->d_name;
565 const char* ext = name + strlen(name) - 4;
566 bool isJarOrZip = ext > name &&
567 (os::file_name_strcmp(ext, ".jar") == 0 ||
568 os::file_name_strcmp(ext, ".zip") == 0);
569 if (isJarOrZip) {
570 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
571 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
572 path = add_to_path(path, jarpath, false);
573 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
574 }
575 }
576 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
577 os::closedir(dir);
578 return path;
579 }
580
581 // Parses a memory size specification string.
582 static bool atomull(const char *s, julong* result) {
583 julong n = 0;
584 int args_read = sscanf(s, JULONG_FORMAT, &n);
585 if (args_read != 1) {
586 return false;
587 }
588 while (*s != '\0' && isdigit(*s)) {
589 s++;
590 }
591 // 4705540: illegal if more characters are found after the first non-digit
592 if (strlen(s) > 1) {
593 return false;
594 }
595 switch (*s) {
596 case 'T': case 't':
597 *result = n * G * K;
598 // Check for overflow.
599 if (*result/((julong)G * K) != n) return false;
600 return true;
601 case 'G': case 'g':
602 *result = n * G;
603 if (*result/G != n) return false;
604 return true;
605 case 'M': case 'm':
606 *result = n * M;
607 if (*result/M != n) return false;
608 return true;
609 case 'K': case 'k':
610 *result = n * K;
611 if (*result/K != n) return false;
612 return true;
613 case '\0':
614 *result = n;
615 return true;
616 default:
617 return false;
618 }
619 }
620
621 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
622 if (size < min_size) return arg_too_small;
623 // Check that size will fit in a size_t (only relevant on 32-bit)
624 if (size > max_uintx) return arg_too_big;
625 return arg_in_range;
626 }
627
628 // Describe an argument out of range error
629 void Arguments::describe_range_error(ArgsRange errcode) {
630 switch(errcode) {
631 case arg_too_big:
632 jio_fprintf(defaultStream::error_stream(),
633 "The specified size exceeds the maximum "
634 "representable size.\n");
635 break;
636 case arg_too_small:
637 case arg_unreadable:
638 case arg_in_range:
639 // do nothing for now
640 break;
641 default:
642 ShouldNotReachHere();
643 }
644 }
645
646 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
647 return CommandLineFlags::boolAtPut(name, &value, origin);
648 }
649
650 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
651 double v;
652 if (sscanf(value, "%lf", &v) != 1) {
653 return false;
654 }
655
656 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
657 return true;
658 }
659 return false;
660 }
661
662 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
663 julong v;
664 intx intx_v;
665 bool is_neg = false;
666 // Check the sign first since atomull() parses only unsigned values.
667 if (*value == '-') {
668 if (!CommandLineFlags::intxAt(name, &intx_v)) {
669 return false;
670 }
671 value++;
672 is_neg = true;
673 }
674 if (!atomull(value, &v)) {
675 return false;
676 }
677 intx_v = (intx) v;
678 if (is_neg) {
679 intx_v = -intx_v;
680 }
681 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
682 return true;
683 }
684 uintx uintx_v = (uintx) v;
685 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
686 return true;
687 }
688 uint64_t uint64_t_v = (uint64_t) v;
689 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
690 return true;
691 }
692 return false;
693 }
694
695 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
696 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
697 // Contract: CommandLineFlags always returns a pointer that needs freeing.
698 FREE_C_HEAP_ARRAY(char, value, mtInternal);
699 return true;
700 }
701
702 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
703 const char* old_value = "";
704 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
705 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
706 size_t new_len = strlen(new_value);
707 const char* value;
708 char* free_this_too = NULL;
709 if (old_len == 0) {
710 value = new_value;
711 } else if (new_len == 0) {
712 value = old_value;
713 } else {
714 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
715 // each new setting adds another LINE to the switch:
716 sprintf(buf, "%s\n%s", old_value, new_value);
717 value = buf;
718 free_this_too = buf;
719 }
720 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
721 // CommandLineFlags always returns a pointer that needs freeing.
722 FREE_C_HEAP_ARRAY(char, value, mtInternal);
723 if (free_this_too != NULL) {
724 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
725 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
726 }
727 return true;
728 }
729
730 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
731
732 // range of acceptable characters spelled out for portability reasons
733 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
734 #define BUFLEN 255
735 char name[BUFLEN+1];
736 char dummy;
737
738 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
739 return set_bool_flag(name, false, origin);
740 }
741 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
742 return set_bool_flag(name, true, origin);
743 }
744
745 char punct;
746 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
747 const char* value = strchr(arg, '=') + 1;
748 Flag* flag = Flag::find_flag(name, strlen(name));
749 if (flag != NULL && flag->is_ccstr()) {
750 if (flag->ccstr_accumulates()) {
751 return append_to_string_flag(name, value, origin);
752 } else {
753 if (value[0] == '\0') {
754 value = NULL;
755 }
756 return set_string_flag(name, value, origin);
757 }
758 }
759 }
760
761 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
762 const char* value = strchr(arg, '=') + 1;
763 // -XX:Foo:=xxx will reset the string flag to the given value.
764 if (value[0] == '\0') {
765 value = NULL;
766 }
767 return set_string_flag(name, value, origin);
768 }
769
770 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
771 #define SIGNED_NUMBER_RANGE "[-0123456789]"
772 #define NUMBER_RANGE "[0123456789]"
773 char value[BUFLEN + 1];
774 char value2[BUFLEN + 1];
775 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
776 // Looks like a floating-point number -- try again with more lenient format string
777 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
778 return set_fp_numeric_flag(name, value, origin);
779 }
780 }
781
782 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
783 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
784 return set_numeric_flag(name, value, origin);
785 }
786
787 return false;
788 }
789
790 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
791 assert(bldarray != NULL, "illegal argument");
792
793 if (arg == NULL) {
794 return;
795 }
796
797 int new_count = *count + 1;
798
799 // expand the array and add arg to the last element
800 if (*bldarray == NULL) {
801 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
802 } else {
803 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
804 }
805 (*bldarray)[*count] = strdup(arg);
806 *count = new_count;
807 }
808
809 void Arguments::build_jvm_args(const char* arg) {
810 add_string(&_jvm_args_array, &_num_jvm_args, arg);
811 }
812
813 void Arguments::build_jvm_flags(const char* arg) {
814 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
815 }
816
817 // utility function to return a string that concatenates all
818 // strings in a given char** array
819 const char* Arguments::build_resource_string(char** args, int count) {
820 if (args == NULL || count == 0) {
821 return NULL;
822 }
823 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
824 for (int i = 1; i < count; i++) {
825 length += strlen(args[i]) + 1; // add 1 for a space
826 }
827 char* s = NEW_RESOURCE_ARRAY(char, length);
828 strcpy(s, args[0]);
829 for (int j = 1; j < count; j++) {
830 strcat(s, " ");
831 strcat(s, args[j]);
832 }
833 return (const char*) s;
834 }
835
836 void Arguments::print_on(outputStream* st) {
837 st->print_cr("VM Arguments:");
838 if (num_jvm_flags() > 0) {
839 st->print("jvm_flags: "); print_jvm_flags_on(st);
840 }
841 if (num_jvm_args() > 0) {
842 st->print("jvm_args: "); print_jvm_args_on(st);
843 }
844 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
845 if (_java_class_path != NULL) {
846 char* path = _java_class_path->value();
847 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
848 }
849 st->print_cr("Launcher Type: %s", _sun_java_launcher);
850 }
851
852 void Arguments::print_jvm_flags_on(outputStream* st) {
853 if (_num_jvm_flags > 0) {
854 for (int i=0; i < _num_jvm_flags; i++) {
855 st->print("%s ", _jvm_flags_array[i]);
856 }
857 st->cr();
858 }
859 }
860
861 void Arguments::print_jvm_args_on(outputStream* st) {
862 if (_num_jvm_args > 0) {
863 for (int i=0; i < _num_jvm_args; i++) {
864 st->print("%s ", _jvm_args_array[i]);
865 }
866 st->cr();
867 }
868 }
869
870 bool Arguments::process_argument(const char* arg,
871 jboolean ignore_unrecognized, Flag::Flags origin) {
872
873 JDK_Version since = JDK_Version();
874
875 if (parse_argument(arg, origin) || ignore_unrecognized) {
876 return true;
877 }
878
879 bool has_plus_minus = (*arg == '+' || *arg == '-');
880 const char* const argname = has_plus_minus ? arg + 1 : arg;
881 if (is_newly_obsolete(arg, &since)) {
882 char version[256];
883 since.to_string(version, sizeof(version));
884 warning("ignoring option %s; support was removed in %s", argname, version);
885 return true;
886 }
887
888 // For locked flags, report a custom error message if available.
889 // Otherwise, report the standard unrecognized VM option.
890
891 size_t arg_len;
892 const char* equal_sign = strchr(argname, '=');
893 if (equal_sign == NULL) {
894 arg_len = strlen(argname);
895 } else {
896 arg_len = equal_sign - argname;
897 }
898
899 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
900 if (found_flag != NULL) {
901 char locked_message_buf[BUFLEN];
902 found_flag->get_locked_message(locked_message_buf, BUFLEN);
903 if (strlen(locked_message_buf) == 0) {
904 if (found_flag->is_bool() && !has_plus_minus) {
905 jio_fprintf(defaultStream::error_stream(),
906 "Missing +/- setting for VM option '%s'\n", argname);
907 } else if (!found_flag->is_bool() && has_plus_minus) {
908 jio_fprintf(defaultStream::error_stream(),
909 "Unexpected +/- setting in VM option '%s'\n", argname);
910 } else {
911 jio_fprintf(defaultStream::error_stream(),
912 "Improperly specified VM option '%s'\n", argname);
913 }
914 } else {
915 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
916 }
917 } else {
918 jio_fprintf(defaultStream::error_stream(),
919 "Unrecognized VM option '%s'\n", argname);
920 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
921 if (fuzzy_matched != NULL) {
922 jio_fprintf(defaultStream::error_stream(),
923 "Did you mean '%s%s%s'?\n",
924 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
925 fuzzy_matched->_name,
926 (fuzzy_matched->is_bool()) ? "" : "=<value>");
927 }
928 }
929
930 // allow for commandline "commenting out" options like -XX:#+Verbose
931 return arg[0] == '#';
932 }
933
934 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
935 FILE* stream = fopen(file_name, "rb");
936 if (stream == NULL) {
937 if (should_exist) {
938 jio_fprintf(defaultStream::error_stream(),
939 "Could not open settings file %s\n", file_name);
940 return false;
941 } else {
942 return true;
943 }
944 }
945
946 char token[1024];
947 int pos = 0;
948
949 bool in_white_space = true;
950 bool in_comment = false;
951 bool in_quote = false;
952 char quote_c = 0;
953 bool result = true;
954
955 int c = getc(stream);
956 while(c != EOF && pos < (int)(sizeof(token)-1)) {
957 if (in_white_space) {
958 if (in_comment) {
959 if (c == '\n') in_comment = false;
960 } else {
961 if (c == '#') in_comment = true;
962 else if (!isspace(c)) {
963 in_white_space = false;
964 token[pos++] = c;
965 }
966 }
967 } else {
968 if (c == '\n' || (!in_quote && isspace(c))) {
969 // token ends at newline, or at unquoted whitespace
970 // this allows a way to include spaces in string-valued options
971 token[pos] = '\0';
972 logOption(token);
973 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
974 build_jvm_flags(token);
975 pos = 0;
976 in_white_space = true;
977 in_quote = false;
978 } else if (!in_quote && (c == '\'' || c == '"')) {
979 in_quote = true;
980 quote_c = c;
981 } else if (in_quote && (c == quote_c)) {
982 in_quote = false;
983 } else {
984 token[pos++] = c;
985 }
986 }
987 c = getc(stream);
988 }
989 if (pos > 0) {
990 token[pos] = '\0';
991 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
992 build_jvm_flags(token);
993 }
994 fclose(stream);
995 return result;
996 }
997
998 //=============================================================================================================
999 // Parsing of properties (-D)
1000
1001 const char* Arguments::get_property(const char* key) {
1002 return PropertyList_get_value(system_properties(), key);
1003 }
1004
1005 bool Arguments::add_property(const char* prop) {
1006 const char* eq = strchr(prop, '=');
1007 char* key;
1008 // ns must be static--its address may be stored in a SystemProperty object.
1009 const static char ns[1] = {0};
1010 char* value = (char *)ns;
1011
1012 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1013 key = AllocateHeap(key_len + 1, mtInternal);
1014 strncpy(key, prop, key_len);
1015 key[key_len] = '\0';
1016
1017 if (eq != NULL) {
1018 size_t value_len = strlen(prop) - key_len - 1;
1019 value = AllocateHeap(value_len + 1, mtInternal);
1020 strncpy(value, &prop[key_len + 1], value_len + 1);
1021 }
1022
1023 if (strcmp(key, "java.compiler") == 0) {
1024 process_java_compiler_argument(value);
1025 FreeHeap(key);
1026 if (eq != NULL) {
1027 FreeHeap(value);
1028 }
1029 return true;
1030 } else if (strcmp(key, "sun.java.command") == 0) {
1031 _java_command = value;
1032
1033 // Record value in Arguments, but let it get passed to Java.
1034 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1035 strcmp(key, "sun.java.launcher.pid") == 0) {
1036 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1037 // private and are processed in process_sun_java_launcher_properties();
1038 // the sun.java.launcher property is passed on to the java application
1039 FreeHeap(key);
1040 if (eq != NULL) {
1041 FreeHeap(value);
1042 }
1043 return true;
1044 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1045 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1046 // its value without going through the property list or making a Java call.
1047 _java_vendor_url_bug = value;
1048 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1049 PropertyList_unique_add(&_system_properties, key, value, true);
1050 return true;
1051 }
1052 // Create new property and add at the end of the list
1053 PropertyList_unique_add(&_system_properties, key, value);
1054 return true;
1055 }
1056
1057 //===========================================================================================================
1058 // Setting int/mixed/comp mode flags
1059
1060 void Arguments::set_mode_flags(Mode mode) {
1061 // Set up default values for all flags.
1062 // If you add a flag to any of the branches below,
1063 // add a default value for it here.
1064 set_java_compiler(false);
1065 _mode = mode;
1066
1067 // Ensure Agent_OnLoad has the correct initial values.
1068 // This may not be the final mode; mode may change later in onload phase.
1069 PropertyList_unique_add(&_system_properties, "java.vm.info",
1070 (char*)VM_Version::vm_info_string(), false);
1071
1072 UseInterpreter = true;
1073 UseCompiler = true;
1074 UseLoopCounter = true;
1075
1076 #ifndef ZERO
1077 // Turn these off for mixed and comp. Leave them on for Zero.
1078 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1079 UseFastAccessorMethods = (mode == _int);
1080 }
1081 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1082 UseFastEmptyMethods = (mode == _int);
1083 }
1084 #endif
1085
1086 // Default values may be platform/compiler dependent -
1087 // use the saved values
1088 ClipInlining = Arguments::_ClipInlining;
1089 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1090 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1091 BackgroundCompilation = Arguments::_BackgroundCompilation;
1092
1093 // Change from defaults based on mode
1094 switch (mode) {
1095 default:
1096 ShouldNotReachHere();
1097 break;
1098 case _int:
1099 UseCompiler = false;
1100 UseLoopCounter = false;
1101 AlwaysCompileLoopMethods = false;
1102 UseOnStackReplacement = false;
1103 break;
1104 case _mixed:
1105 // same as default
1106 break;
1107 case _comp:
1108 UseInterpreter = false;
1109 BackgroundCompilation = false;
1110 ClipInlining = false;
1111 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1112 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1113 // compile a level 4 (C2) and then continue executing it.
1114 if (TieredCompilation) {
1115 Tier3InvokeNotifyFreqLog = 0;
1116 Tier4InvocationThreshold = 0;
1117 }
1118 break;
1119 }
1120 }
1121
1122 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1123 // Conflict: required to use shared spaces (-Xshare:on), but
1124 // incompatible command line options were chosen.
1125
1126 static void no_shared_spaces() {
1127 if (RequireSharedSpaces) {
1128 jio_fprintf(defaultStream::error_stream(),
1129 "Class data sharing is inconsistent with other specified options.\n");
1130 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1131 } else {
1132 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1133 }
1134 }
1135 #endif
1136
1137 void Arguments::set_tiered_flags() {
1138 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1139 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1140 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1141 }
1142 if (CompilationPolicyChoice < 2) {
1143 vm_exit_during_initialization(
1144 "Incompatible compilation policy selected", NULL);
1145 }
1146 // Increase the code cache size - tiered compiles a lot more.
1147 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1148 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1149 }
1150 if (!UseInterpreter) { // -Xcomp
1151 Tier3InvokeNotifyFreqLog = 0;
1152 Tier4InvocationThreshold = 0;
1153 }
1154 }
1155
1156 /**
1157 * Returns the minimum number of compiler threads needed to run the JVM. The following
1158 * configurations are possible.
1159 *
1160 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1161 * compiler threads is 0.
1162 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1163 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1164 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1165 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1166 * C1 can be used, so the minimum number of compiler threads is 1.
1167 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1168 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1169 * the minimum number of compiler threads is 2.
1170 */
1171 int Arguments::get_min_number_of_compiler_threads() {
1172 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1173 return 0; // case 1
1174 #else
1175 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1176 return 1; // case 2 or case 3
1177 }
1178 return 2; // case 4 (tiered)
1179 #endif
1180 }
1181
1182 #if INCLUDE_ALL_GCS
1183 static void disable_adaptive_size_policy(const char* collector_name) {
1184 if (UseAdaptiveSizePolicy) {
1185 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1186 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1187 collector_name);
1188 }
1189 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1190 }
1191 }
1192
1193 void Arguments::set_parnew_gc_flags() {
1194 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1195 "control point invariant");
1196 assert(UseParNewGC, "Error");
1197
1198 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1199 disable_adaptive_size_policy("UseParNewGC");
1200
1201 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1202 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1203 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1204 } else if (ParallelGCThreads == 0) {
1205 jio_fprintf(defaultStream::error_stream(),
1206 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1207 vm_exit(1);
1208 }
1209
1210 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1211 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1212 // we set them to 1024 and 1024.
1213 // See CR 6362902.
1214 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1215 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1216 }
1217 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1218 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1219 }
1220
1221 // When using compressed oops, we use local overflow stacks,
1222 // rather than using a global overflow list chained through
1223 // the klass word of the object's pre-image.
1224 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1225 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1226 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1227 }
1228 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1229 }
1230 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1231 }
1232
1233 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1234 // sparc/solaris for certain applications, but would gain from
1235 // further optimization and tuning efforts, and would almost
1236 // certainly gain from analysis of platform and environment.
1237 void Arguments::set_cms_and_parnew_gc_flags() {
1238 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1239 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1240
1241 // If we are using CMS, we prefer to UseParNewGC,
1242 // unless explicitly forbidden.
1243 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1244 FLAG_SET_ERGO(bool, UseParNewGC, true);
1245 }
1246
1247 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1248 disable_adaptive_size_policy("UseConcMarkSweepGC");
1249
1250 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1251 // as needed.
1252 if (UseParNewGC) {
1253 set_parnew_gc_flags();
1254 }
1255
1256 size_t max_heap = align_size_down(MaxHeapSize,
1257 CardTableRS::ct_max_alignment_constraint());
1258
1259 // Now make adjustments for CMS
1260 intx tenuring_default = (intx)6;
1261 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1262
1263 // Preferred young gen size for "short" pauses:
1264 // upper bound depends on # of threads and NewRatio.
1265 const uintx parallel_gc_threads =
1266 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1267 const size_t preferred_max_new_size_unaligned =
1268 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1269 size_t preferred_max_new_size =
1270 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1271
1272 // Unless explicitly requested otherwise, size young gen
1273 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1274
1275 // If either MaxNewSize or NewRatio is set on the command line,
1276 // assume the user is trying to set the size of the young gen.
1277 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1278
1279 // Set MaxNewSize to our calculated preferred_max_new_size unless
1280 // NewSize was set on the command line and it is larger than
1281 // preferred_max_new_size.
1282 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1283 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1284 } else {
1285 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1286 }
1287 if (PrintGCDetails && Verbose) {
1288 // Too early to use gclog_or_tty
1289 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1290 }
1291
1292 // Code along this path potentially sets NewSize and OldSize
1293 if (PrintGCDetails && Verbose) {
1294 // Too early to use gclog_or_tty
1295 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1296 " initial_heap_size: " SIZE_FORMAT
1297 " max_heap: " SIZE_FORMAT,
1298 min_heap_size(), InitialHeapSize, max_heap);
1299 }
1300 size_t min_new = preferred_max_new_size;
1301 if (FLAG_IS_CMDLINE(NewSize)) {
1302 min_new = NewSize;
1303 }
1304 if (max_heap > min_new && min_heap_size() > min_new) {
1305 // Unless explicitly requested otherwise, make young gen
1306 // at least min_new, and at most preferred_max_new_size.
1307 if (FLAG_IS_DEFAULT(NewSize)) {
1308 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1309 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1310 if (PrintGCDetails && Verbose) {
1311 // Too early to use gclog_or_tty
1312 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1313 }
1314 }
1315 // Unless explicitly requested otherwise, size old gen
1316 // so it's NewRatio x of NewSize.
1317 if (FLAG_IS_DEFAULT(OldSize)) {
1318 if (max_heap > NewSize) {
1319 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1320 if (PrintGCDetails && Verbose) {
1321 // Too early to use gclog_or_tty
1322 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1323 }
1324 }
1325 }
1326 }
1327 }
1328 // Unless explicitly requested otherwise, definitely
1329 // promote all objects surviving "tenuring_default" scavenges.
1330 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1331 FLAG_IS_DEFAULT(SurvivorRatio)) {
1332 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1333 }
1334 // If we decided above (or user explicitly requested)
1335 // `promote all' (via MaxTenuringThreshold := 0),
1336 // prefer minuscule survivor spaces so as not to waste
1337 // space for (non-existent) survivors
1338 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1339 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1340 }
1341 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1342 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1343 // This is done in order to make ParNew+CMS configuration to work
1344 // with YoungPLABSize and OldPLABSize options.
1345 // See CR 6362902.
1346 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1347 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1348 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1349 // is. In this situation let CMSParPromoteBlocksToClaim follow
1350 // the value (either from the command line or ergonomics) of
1351 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1352 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1353 } else {
1354 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1355 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1356 // we'll let it to take precedence.
1357 jio_fprintf(defaultStream::error_stream(),
1358 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1359 " options are specified for the CMS collector."
1360 " CMSParPromoteBlocksToClaim will take precedence.\n");
1361 }
1362 }
1363 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1364 // OldPLAB sizing manually turned off: Use a larger default setting,
1365 // unless it was manually specified. This is because a too-low value
1366 // will slow down scavenges.
1367 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1368 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1369 }
1370 }
1371 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1372 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1373 // If either of the static initialization defaults have changed, note this
1374 // modification.
1375 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1376 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1377 }
1378 if (PrintGCDetails && Verbose) {
1379 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1380 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1381 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1382 }
1383 }
1384 #endif // INCLUDE_ALL_GCS
1385
1386 void set_object_alignment() {
1387 // Object alignment.
1388 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1389 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1390 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1391 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1392 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1393 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1394
1395 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1396 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1397
1398 // Oop encoding heap max
1399 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1400
1401 #if INCLUDE_ALL_GCS
1402 // Set CMS global values
1403 CompactibleFreeListSpace::set_cms_values();
1404 #endif // INCLUDE_ALL_GCS
1405 }
1406
1407 bool verify_object_alignment() {
1408 // Object alignment.
1409 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1410 jio_fprintf(defaultStream::error_stream(),
1411 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1412 (int)ObjectAlignmentInBytes);
1413 return false;
1414 }
1415 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1416 jio_fprintf(defaultStream::error_stream(),
1417 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1418 (int)ObjectAlignmentInBytes, BytesPerLong);
1419 return false;
1420 }
1421 // It does not make sense to have big object alignment
1422 // since a space lost due to alignment will be greater
1423 // then a saved space from compressed oops.
1424 if ((int)ObjectAlignmentInBytes > 256) {
1425 jio_fprintf(defaultStream::error_stream(),
1426 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1427 (int)ObjectAlignmentInBytes);
1428 return false;
1429 }
1430 // In case page size is very small.
1431 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1432 jio_fprintf(defaultStream::error_stream(),
1433 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1434 (int)ObjectAlignmentInBytes, os::vm_page_size());
1435 return false;
1436 }
1437 return true;
1438 }
1439
1440 size_t Arguments::max_heap_for_compressed_oops() {
1441 // Avoid sign flip.
1442 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1443 // We need to fit both the NULL page and the heap into the memory budget, while
1444 // keeping alignment constraints of the heap. To guarantee the latter, as the
1445 // NULL page is located before the heap, we pad the NULL page to the conservative
1446 // maximum alignment that the GC may ever impose upon the heap.
1447 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1448 _conservative_max_heap_alignment);
1449
1450 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1451 NOT_LP64(ShouldNotReachHere(); return 0);
1452 }
1453
1454 bool Arguments::should_auto_select_low_pause_collector() {
1455 if (UseAutoGCSelectPolicy &&
1456 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1457 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1458 if (PrintGCDetails) {
1459 // Cannot use gclog_or_tty yet.
1460 tty->print_cr("Automatic selection of the low pause collector"
1461 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1462 }
1463 return true;
1464 }
1465 return false;
1466 }
1467
1468 void Arguments::set_use_compressed_oops() {
1469 #ifndef ZERO
1470 #ifdef _LP64
1471 // MaxHeapSize is not set up properly at this point, but
1472 // the only value that can override MaxHeapSize if we are
1473 // to use UseCompressedOops is InitialHeapSize.
1474 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1475
1476 if (max_heap_size <= max_heap_for_compressed_oops()) {
1477 #if !defined(COMPILER1) || defined(TIERED)
1478 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1479 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1480 }
1481 #endif
1482 #ifdef _WIN64
1483 if (UseLargePages && UseCompressedOops) {
1484 // Cannot allocate guard pages for implicit checks in indexed addressing
1485 // mode, when large pages are specified on windows.
1486 // This flag could be switched ON if narrow oop base address is set to 0,
1487 // see code in Universe::initialize_heap().
1488 Universe::set_narrow_oop_use_implicit_null_checks(false);
1489 }
1490 #endif // _WIN64
1491 } else {
1492 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1493 warning("Max heap size too large for Compressed Oops");
1494 FLAG_SET_DEFAULT(UseCompressedOops, false);
1495 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1496 }
1497 }
1498 #endif // _LP64
1499 #endif // ZERO
1500 }
1501
1502
1503 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1504 // set_use_compressed_oops().
1505 void Arguments::set_use_compressed_klass_ptrs() {
1506 #ifndef ZERO
1507 #ifdef _LP64
1508 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1509 if (!UseCompressedOops) {
1510 if (UseCompressedClassPointers) {
1511 warning("UseCompressedClassPointers requires UseCompressedOops");
1512 }
1513 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1514 } else {
1515 // Turn on UseCompressedClassPointers too
1516 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1517 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1518 }
1519 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1520 if (UseCompressedClassPointers) {
1521 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1522 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1523 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1524 }
1525 }
1526 }
1527 #endif // _LP64
1528 #endif // !ZERO
1529 }
1530
1531 void Arguments::set_conservative_max_heap_alignment() {
1532 // The conservative maximum required alignment for the heap is the maximum of
1533 // the alignments imposed by several sources: any requirements from the heap
1534 // itself, the collector policy and the maximum page size we may run the VM
1535 // with.
1536 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1537 #if INCLUDE_ALL_GCS
1538 if (UseParallelGC) {
1539 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1540 } else if (UseG1GC) {
1541 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1542 }
1543 #endif // INCLUDE_ALL_GCS
1544 _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(),
1545 CollectorPolicy::compute_heap_alignment());
1546 }
1547
1548 void Arguments::set_ergonomics_flags() {
1549
1550 if (os::is_server_class_machine()) {
1551 // If no other collector is requested explicitly,
1552 // let the VM select the collector based on
1553 // machine class and automatic selection policy.
1554 if (!UseSerialGC &&
1555 !UseConcMarkSweepGC &&
1556 !UseG1GC &&
1557 !UseParNewGC &&
1558 FLAG_IS_DEFAULT(UseParallelGC)) {
1559 if (should_auto_select_low_pause_collector()) {
1560 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1561 } else {
1562 FLAG_SET_ERGO(bool, UseParallelGC, true);
1563 }
1564 }
1565 }
1566 #ifdef COMPILER2
1567 // Shared spaces work fine with other GCs but causes bytecode rewriting
1568 // to be disabled, which hurts interpreter performance and decreases
1569 // server performance. When -server is specified, keep the default off
1570 // unless it is asked for. Future work: either add bytecode rewriting
1571 // at link time, or rewrite bytecodes in non-shared methods.
1572 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1573 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1574 no_shared_spaces();
1575 }
1576 #endif
1577
1578 set_conservative_max_heap_alignment();
1579
1580 #ifndef ZERO
1581 #ifdef _LP64
1582 set_use_compressed_oops();
1583
1584 // set_use_compressed_klass_ptrs() must be called after calling
1585 // set_use_compressed_oops().
1586 set_use_compressed_klass_ptrs();
1587
1588 // Also checks that certain machines are slower with compressed oops
1589 // in vm_version initialization code.
1590 #endif // _LP64
1591 #endif // !ZERO
1592 }
1593
1594 void Arguments::set_parallel_gc_flags() {
1595 assert(UseParallelGC || UseParallelOldGC, "Error");
1596 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1597 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1598 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1599 }
1600 FLAG_SET_DEFAULT(UseParallelGC, true);
1601
1602 // If no heap maximum was requested explicitly, use some reasonable fraction
1603 // of the physical memory, up to a maximum of 1GB.
1604 FLAG_SET_DEFAULT(ParallelGCThreads,
1605 Abstract_VM_Version::parallel_worker_threads());
1606 if (ParallelGCThreads == 0) {
1607 jio_fprintf(defaultStream::error_stream(),
1608 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1609 vm_exit(1);
1610 }
1611
1612 if (UseAdaptiveSizePolicy) {
1613 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1614 // unless the user actually sets these flags.
1615 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1616 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1617 }
1618 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1619 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1620 }
1621 }
1622
1623 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1624 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1625 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1626 // See CR 6362902 for details.
1627 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1628 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1629 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1630 }
1631 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1632 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1633 }
1634 }
1635
1636 if (UseParallelOldGC) {
1637 // Par compact uses lower default values since they are treated as
1638 // minimums. These are different defaults because of the different
1639 // interpretation and are not ergonomically set.
1640 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1641 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1642 }
1643 }
1644 }
1645
1646 void Arguments::set_g1_gc_flags() {
1647 assert(UseG1GC, "Error");
1648 #ifdef COMPILER1
1649 FastTLABRefill = false;
1650 #endif
1651 FLAG_SET_DEFAULT(ParallelGCThreads,
1652 Abstract_VM_Version::parallel_worker_threads());
1653 if (ParallelGCThreads == 0) {
1654 FLAG_SET_DEFAULT(ParallelGCThreads,
1655 Abstract_VM_Version::parallel_worker_threads());
1656 }
1657
1658 // MarkStackSize will be set (if it hasn't been set by the user)
1659 // when concurrent marking is initialized.
1660 // Its value will be based upon the number of parallel marking threads.
1661 // But we do set the maximum mark stack size here.
1662 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1663 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1664 }
1665
1666 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1667 // In G1, we want the default GC overhead goal to be higher than
1668 // say in PS. So we set it here to 10%. Otherwise the heap might
1669 // be expanded more aggressively than we would like it to. In
1670 // fact, even 10% seems to not be high enough in some cases
1671 // (especially small GC stress tests that the main thing they do
1672 // is allocation). We might consider increase it further.
1673 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1674 }
1675
1676 if (PrintGCDetails && Verbose) {
1677 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1678 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1679 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1680 }
1681 }
1682
1683 julong Arguments::limit_by_allocatable_memory(julong limit) {
1684 julong max_allocatable;
1685 julong result = limit;
1686 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1687 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1688 }
1689 return result;
1690 }
1691
1692 // Use static initialization to get the default before parsing
1693 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1694
1695 void Arguments::set_heap_size() {
1696 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1697 // Deprecated flag
1698 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1699 }
1700
1701 const julong phys_mem =
1702 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1703 : (julong)MaxRAM;
1704
1705 // If the maximum heap size has not been set with -Xmx,
1706 // then set it as fraction of the size of physical memory,
1707 // respecting the maximum and minimum sizes of the heap.
1708 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1709 julong reasonable_max = phys_mem / MaxRAMFraction;
1710
1711 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1712 // Small physical memory, so use a minimum fraction of it for the heap
1713 reasonable_max = phys_mem / MinRAMFraction;
1714 } else {
1715 // Not-small physical memory, so require a heap at least
1716 // as large as MaxHeapSize
1717 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1718 }
1719 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1720 // Limit the heap size to ErgoHeapSizeLimit
1721 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1722 }
1723 if (UseCompressedOops) {
1724 // Limit the heap size to the maximum possible when using compressed oops
1725 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1726
1727 // HeapBaseMinAddress can be greater than default but not less than.
1728 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1729 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1730 // matches compressed oops printing flags
1731 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1732 jio_fprintf(defaultStream::error_stream(),
1733 "HeapBaseMinAddress must be at least " UINTX_FORMAT
1734 " (" UINTX_FORMAT "G) which is greater than value given "
1735 UINTX_FORMAT "\n",
1736 DefaultHeapBaseMinAddress,
1737 DefaultHeapBaseMinAddress/G,
1738 HeapBaseMinAddress);
1739 }
1740 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1741 }
1742 }
1743
1744 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1745 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1746 // but it should be not less than default MaxHeapSize.
1747 max_coop_heap -= HeapBaseMinAddress;
1748 }
1749 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1750 }
1751 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1752
1753 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1754 // An initial heap size was specified on the command line,
1755 // so be sure that the maximum size is consistent. Done
1756 // after call to limit_by_allocatable_memory because that
1757 // method might reduce the allocation size.
1758 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1759 }
1760
1761 if (PrintGCDetails && Verbose) {
1762 // Cannot use gclog_or_tty yet.
1763 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1764 }
1765 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1766 }
1767
1768 // If the minimum or initial heap_size have not been set or requested to be set
1769 // ergonomically, set them accordingly.
1770 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1771 julong reasonable_minimum = (julong)(OldSize + NewSize);
1772
1773 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1774
1775 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1776
1777 if (InitialHeapSize == 0) {
1778 julong reasonable_initial = phys_mem / InitialRAMFraction;
1779
1780 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1781 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1782
1783 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1784
1785 if (PrintGCDetails && Verbose) {
1786 // Cannot use gclog_or_tty yet.
1787 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1788 }
1789 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1790 }
1791 // If the minimum heap size has not been set (via -Xms),
1792 // synchronize with InitialHeapSize to avoid errors with the default value.
1793 if (min_heap_size() == 0) {
1794 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1795 if (PrintGCDetails && Verbose) {
1796 // Cannot use gclog_or_tty yet.
1797 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1798 }
1799 }
1800 }
1801 }
1802
1803 // This must be called after ergonomics because we want bytecode rewriting
1804 // if the server compiler is used, or if UseSharedSpaces is disabled.
1805 void Arguments::set_bytecode_flags() {
1806 // Better not attempt to store into a read-only space.
1807 if (UseSharedSpaces) {
1808 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1809 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1810 }
1811
1812 if (!RewriteBytecodes) {
1813 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1814 }
1815 }
1816
1817 // Aggressive optimization flags -XX:+AggressiveOpts
1818 void Arguments::set_aggressive_opts_flags() {
1819 #ifdef COMPILER2
1820 if (AggressiveUnboxing) {
1821 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1822 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1823 } else if (!EliminateAutoBox) {
1824 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1825 AggressiveUnboxing = false;
1826 }
1827 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1828 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1829 } else if (!DoEscapeAnalysis) {
1830 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1831 AggressiveUnboxing = false;
1832 }
1833 }
1834 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1835 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1836 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1837 }
1838 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1839 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1840 }
1841
1842 // Feed the cache size setting into the JDK
1843 char buffer[1024];
1844 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1845 add_property(buffer);
1846 }
1847 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1848 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1849 }
1850 #endif
1851
1852 if (AggressiveOpts) {
1853 // Sample flag setting code
1854 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1855 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1856 // }
1857 }
1858 }
1859
1860 //===========================================================================================================
1861 // Parsing of java.compiler property
1862
1863 void Arguments::process_java_compiler_argument(char* arg) {
1864 // For backwards compatibility, Djava.compiler=NONE or ""
1865 // causes us to switch to -Xint mode UNLESS -Xdebug
1866 // is also specified.
1867 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1868 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1869 }
1870 }
1871
1872 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1873 _sun_java_launcher = strdup(launcher);
1874 }
1875
1876 bool Arguments::created_by_java_launcher() {
1877 assert(_sun_java_launcher != NULL, "property must have value");
1878 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1879 }
1880
1881 bool Arguments::sun_java_launcher_is_altjvm() {
1882 return _sun_java_launcher_is_altjvm;
1883 }
1884
1885 //===========================================================================================================
1886 // Parsing of main arguments
1887
1888 bool Arguments::verify_interval(uintx val, uintx min,
1889 uintx max, const char* name) {
1890 // Returns true iff value is in the inclusive interval [min..max]
1891 // false, otherwise.
1892 if (val >= min && val <= max) {
1893 return true;
1894 }
1895 jio_fprintf(defaultStream::error_stream(),
1896 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1897 " and " UINTX_FORMAT "\n",
1898 name, val, min, max);
1899 return false;
1900 }
1901
1902 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1903 // Returns true if given value is at least specified min threshold
1904 // false, otherwise.
1905 if (val >= min ) {
1906 return true;
1907 }
1908 jio_fprintf(defaultStream::error_stream(),
1909 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1910 name, val, min);
1911 return false;
1912 }
1913
1914 bool Arguments::verify_percentage(uintx value, const char* name) {
1915 if (is_percentage(value)) {
1916 return true;
1917 }
1918 jio_fprintf(defaultStream::error_stream(),
1919 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1920 name, value);
1921 return false;
1922 }
1923
1924 #if !INCLUDE_ALL_GCS
1925 #ifdef ASSERT
1926 static bool verify_serial_gc_flags() {
1927 return (UseSerialGC &&
1928 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1929 UseParallelGC || UseParallelOldGC));
1930 }
1931 #endif // ASSERT
1932 #endif // INCLUDE_ALL_GCS
1933
1934 // check if do gclog rotation
1935 // +UseGCLogFileRotation is a must,
1936 // no gc log rotation when log file not supplied or
1937 // NumberOfGCLogFiles is 0
1938 void check_gclog_consistency() {
1939 if (UseGCLogFileRotation) {
1940 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1941 jio_fprintf(defaultStream::output_stream(),
1942 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1943 "where num_of_file > 0\n"
1944 "GC log rotation is turned off\n");
1945 UseGCLogFileRotation = false;
1946 }
1947 }
1948
1949 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1950 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1951 jio_fprintf(defaultStream::output_stream(),
1952 "GCLogFileSize changed to minimum 8K\n");
1953 }
1954 }
1955
1956 // This function is called for -Xloggc:<filename>, it can be used
1957 // to check if a given file name(or string) conforms to the following
1958 // specification:
1959 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1960 // %p and %t only allowed once. We only limit usage of filename not path
1961 bool is_filename_valid(const char *file_name) {
1962 const char* p = file_name;
1963 char file_sep = os::file_separator()[0];
1964 const char* cp;
1965 // skip prefix path
1966 for (cp = file_name; *cp != '\0'; cp++) {
1967 if (*cp == '/' || *cp == file_sep) {
1968 p = cp + 1;
1969 }
1970 }
1971
1972 int count_p = 0;
1973 int count_t = 0;
1974 while (*p != '\0') {
1975 if ((*p >= '0' && *p <= '9') ||
1976 (*p >= 'A' && *p <= 'Z') ||
1977 (*p >= 'a' && *p <= 'z') ||
1978 *p == '-' ||
1979 *p == '_' ||
1980 *p == '.') {
1981 p++;
1982 continue;
1983 }
1984 if (*p == '%') {
1985 if(*(p + 1) == 'p') {
1986 p += 2;
1987 count_p ++;
1988 continue;
1989 }
1990 if (*(p + 1) == 't') {
1991 p += 2;
1992 count_t ++;
1993 continue;
1994 }
1995 }
1996 return false;
1997 }
1998 return count_p < 2 && count_t < 2;
1999 }
2000
2001 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2002 if (!is_percentage(min_heap_free_ratio)) {
2003 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2004 return false;
2005 }
2006 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2007 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2008 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2009 MaxHeapFreeRatio);
2010 return false;
2011 }
2012 return true;
2013 }
2014
2015 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2016 if (!is_percentage(max_heap_free_ratio)) {
2017 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2018 return false;
2019 }
2020 if (max_heap_free_ratio < MinHeapFreeRatio) {
2021 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2022 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2023 MinHeapFreeRatio);
2024 return false;
2025 }
2026 return true;
2027 }
2028
2029 // Check consistency of GC selection
2030 bool Arguments::check_gc_consistency() {
2031 check_gclog_consistency();
2032 bool status = true;
2033 // Ensure that the user has not selected conflicting sets
2034 // of collectors. [Note: this check is merely a user convenience;
2035 // collectors over-ride each other so that only a non-conflicting
2036 // set is selected; however what the user gets is not what they
2037 // may have expected from the combination they asked for. It's
2038 // better to reduce user confusion by not allowing them to
2039 // select conflicting combinations.
2040 uint i = 0;
2041 if (UseSerialGC) i++;
2042 if (UseConcMarkSweepGC || UseParNewGC) i++;
2043 if (UseParallelGC || UseParallelOldGC) i++;
2044 if (UseG1GC) i++;
2045 if (i > 1) {
2046 jio_fprintf(defaultStream::error_stream(),
2047 "Conflicting collector combinations in option list; "
2048 "please refer to the release notes for the combinations "
2049 "allowed\n");
2050 status = false;
2051 }
2052 return status;
2053 }
2054
2055 void Arguments::check_deprecated_gcs() {
2056 if (UseConcMarkSweepGC && !UseParNewGC) {
2057 warning("Using the DefNew young collector with the CMS collector is deprecated "
2058 "and will likely be removed in a future release");
2059 }
2060
2061 if (UseParNewGC && !UseConcMarkSweepGC) {
2062 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2063 // set up UseSerialGC properly, so that can't be used in the check here.
2064 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2065 "and will likely be removed in a future release");
2066 }
2067
2068 if (CMSIncrementalMode) {
2069 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2070 }
2071 }
2072
2073 void Arguments::check_deprecated_gc_flags() {
2074 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2075 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2076 "and will likely be removed in future release");
2077 }
2078 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2079 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2080 "Use MaxRAMFraction instead.");
2081 }
2082 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2083 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2084 }
2085 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2086 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2087 }
2088 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2089 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2090 }
2091 }
2092
2093 // Check stack pages settings
2094 bool Arguments::check_stack_pages()
2095 {
2096 bool status = true;
2097 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2098 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2099 // greater stack shadow pages can't generate instruction to bang stack
2100 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2101 return status;
2102 }
2103
2104 // Check the consistency of vm_init_args
2105 bool Arguments::check_vm_args_consistency() {
2106 // Method for adding checks for flag consistency.
2107 // The intent is to warn the user of all possible conflicts,
2108 // before returning an error.
2109 // Note: Needs platform-dependent factoring.
2110 bool status = true;
2111
2112 if (TLABRefillWasteFraction == 0) {
2113 jio_fprintf(defaultStream::error_stream(),
2114 "TLABRefillWasteFraction should be a denominator, "
2115 "not " SIZE_FORMAT "\n",
2116 TLABRefillWasteFraction);
2117 status = false;
2118 }
2119
2120 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2121 "AdaptiveSizePolicyWeight");
2122 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2123
2124 // Divide by bucket size to prevent a large size from causing rollover when
2125 // calculating amount of memory needed to be allocated for the String table.
2126 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2127 (max_uintx / StringTable::bucket_size()), "StringTable size");
2128
2129 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2130 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2131
2132 {
2133 // Using "else if" below to avoid printing two error messages if min > max.
2134 // This will also prevent us from reporting both min>100 and max>100 at the
2135 // same time, but that is less annoying than printing two identical errors IMHO.
2136 FormatBuffer<80> err_msg("%s","");
2137 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2138 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2139 status = false;
2140 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2141 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2142 status = false;
2143 }
2144 }
2145
2146 // Min/MaxMetaspaceFreeRatio
2147 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2148 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2149
2150 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2151 jio_fprintf(defaultStream::error_stream(),
2152 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2153 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2154 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2155 MinMetaspaceFreeRatio,
2156 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2157 MaxMetaspaceFreeRatio);
2158 status = false;
2159 }
2160
2161 // Trying to keep 100% free is not practical
2162 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2163
2164 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2165 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2166 }
2167
2168 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2169 // Settings to encourage splitting.
2170 if (!FLAG_IS_CMDLINE(NewRatio)) {
2171 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2172 }
2173 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2174 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2175 }
2176 }
2177
2178 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2179 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2180 if (GCTimeLimit == 100) {
2181 // Turn off gc-overhead-limit-exceeded checks
2182 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2183 }
2184
2185 status = status && check_gc_consistency();
2186 status = status && check_stack_pages();
2187
2188 if (CMSIncrementalMode) {
2189 if (!UseConcMarkSweepGC) {
2190 jio_fprintf(defaultStream::error_stream(),
2191 "error: invalid argument combination.\n"
2192 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2193 "selected in order\nto use CMSIncrementalMode.\n");
2194 status = false;
2195 } else {
2196 status = status && verify_percentage(CMSIncrementalDutyCycle,
2197 "CMSIncrementalDutyCycle");
2198 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2199 "CMSIncrementalDutyCycleMin");
2200 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2201 "CMSIncrementalSafetyFactor");
2202 status = status && verify_percentage(CMSIncrementalOffset,
2203 "CMSIncrementalOffset");
2204 status = status && verify_percentage(CMSExpAvgFactor,
2205 "CMSExpAvgFactor");
2206 // If it was not set on the command line, set
2207 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2208 if (CMSInitiatingOccupancyFraction < 0) {
2209 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2210 }
2211 }
2212 }
2213
2214 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2215 // insists that we hold the requisite locks so that the iteration is
2216 // MT-safe. For the verification at start-up and shut-down, we don't
2217 // yet have a good way of acquiring and releasing these locks,
2218 // which are not visible at the CollectedHeap level. We want to
2219 // be able to acquire these locks and then do the iteration rather
2220 // than just disable the lock verification. This will be fixed under
2221 // bug 4788986.
2222 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2223 if (VerifyDuringStartup) {
2224 warning("Heap verification at start-up disabled "
2225 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2226 VerifyDuringStartup = false; // Disable verification at start-up
2227 }
2228
2229 if (VerifyBeforeExit) {
2230 warning("Heap verification at shutdown disabled "
2231 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2232 VerifyBeforeExit = false; // Disable verification at shutdown
2233 }
2234 }
2235
2236 // Note: only executed in non-PRODUCT mode
2237 if (!UseAsyncConcMarkSweepGC &&
2238 (ExplicitGCInvokesConcurrent ||
2239 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2240 jio_fprintf(defaultStream::error_stream(),
2241 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2242 " with -UseAsyncConcMarkSweepGC");
2243 status = false;
2244 }
2245
2246 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2247
2248 #if INCLUDE_ALL_GCS
2249 if (UseG1GC) {
2250 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2251 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2252 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2253
2254 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2255 "InitiatingHeapOccupancyPercent");
2256 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2257 "G1RefProcDrainInterval");
2258 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2259 "G1ConcMarkStepDurationMillis");
2260 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2261 "G1ConcRSHotCardLimit");
2262 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2263 "G1ConcRSLogCacheSize");
2264 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2265 "StringDeduplicationAgeThreshold");
2266 }
2267 if (UseConcMarkSweepGC) {
2268 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2269 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2270 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2271 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2272
2273 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2274
2275 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2276 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2277 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2278
2279 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2280
2281 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2282 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2283
2284 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2285 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2286 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2287
2288 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2289
2290 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2291
2292 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2293 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2294 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2295 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2296 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2297 }
2298
2299 if (UseParallelGC || UseParallelOldGC) {
2300 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2301 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2302
2303 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2304 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2305
2306 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2307 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2308
2309 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2310
2311 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2312 }
2313 #endif // INCLUDE_ALL_GCS
2314
2315 status = status && verify_interval(RefDiscoveryPolicy,
2316 ReferenceProcessor::DiscoveryPolicyMin,
2317 ReferenceProcessor::DiscoveryPolicyMax,
2318 "RefDiscoveryPolicy");
2319
2320 // Limit the lower bound of this flag to 1 as it is used in a division
2321 // expression.
2322 status = status && verify_interval(TLABWasteTargetPercent,
2323 1, 100, "TLABWasteTargetPercent");
2324
2325 status = status && verify_object_alignment();
2326
2327 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2328 "CompressedClassSpaceSize");
2329
2330 status = status && verify_interval(MarkStackSizeMax,
2331 1, (max_jint - 1), "MarkStackSizeMax");
2332 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2333
2334 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2335
2336 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2337
2338 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2339
2340 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2341 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2342
2343 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2344
2345 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2346 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2347 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2348 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2349
2350 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2351 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2352
2353 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2354 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2355 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2356
2357 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2358 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2359
2360 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2361 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2362 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2363 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2364
2365 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2366
2367 if (PrintNMTStatistics) {
2368 #if INCLUDE_NMT
2369 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2370 #endif // INCLUDE_NMT
2371 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2372 PrintNMTStatistics = false;
2373 #if INCLUDE_NMT
2374 }
2375 #endif
2376 }
2377
2378 // Need to limit the extent of the padding to reasonable size.
2379 // 8K is well beyond the reasonable HW cache line size, even with the
2380 // aggressive prefetching, while still leaving the room for segregating
2381 // among the distinct pages.
2382 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2383 jio_fprintf(defaultStream::error_stream(),
2384 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2385 ContendedPaddingWidth, 0, 8192);
2386 status = false;
2387 }
2388
2389 // Need to enforce the padding not to break the existing field alignments.
2390 // It is sufficient to check against the largest type size.
2391 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2392 jio_fprintf(defaultStream::error_stream(),
2393 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2394 ContendedPaddingWidth, BytesPerLong);
2395 status = false;
2396 }
2397
2398 // Check lower bounds of the code cache
2399 // Template Interpreter code is approximately 3X larger in debug builds.
2400 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2401 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2402 jio_fprintf(defaultStream::error_stream(),
2403 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2404 os::vm_page_size()/K);
2405 status = false;
2406 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2407 jio_fprintf(defaultStream::error_stream(),
2408 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2409 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2410 status = false;
2411 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2412 jio_fprintf(defaultStream::error_stream(),
2413 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2414 min_code_cache_size/K);
2415 status = false;
2416 } else if (ReservedCodeCacheSize > 2*G) {
2417 // Code cache size larger than MAXINT is not supported.
2418 jio_fprintf(defaultStream::error_stream(),
2419 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2420 (2*G)/M);
2421 status = false;
2422 }
2423
2424 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2425 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2426 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2427 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2428
2429 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2430 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2431 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2432 // Check the minimum number of compiler threads
2433 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2434
2435 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2436 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2437 }
2438
2439 return status;
2440 }
2441
2442 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2443 const char* option_type) {
2444 if (ignore) return false;
2445
2446 const char* spacer = " ";
2447 if (option_type == NULL) {
2448 option_type = ++spacer; // Set both to the empty string.
2449 }
2450
2451 if (os::obsolete_option(option)) {
2452 jio_fprintf(defaultStream::error_stream(),
2453 "Obsolete %s%soption: %s\n", option_type, spacer,
2454 option->optionString);
2455 return false;
2456 } else {
2457 jio_fprintf(defaultStream::error_stream(),
2458 "Unrecognized %s%soption: %s\n", option_type, spacer,
2459 option->optionString);
2460 return true;
2461 }
2462 }
2463
2464 static const char* user_assertion_options[] = {
2465 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2466 };
2467
2468 static const char* system_assertion_options[] = {
2469 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2470 };
2471
2472 // Return true if any of the strings in null-terminated array 'names' matches.
2473 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2474 // the option must match exactly.
2475 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2476 bool tail_allowed) {
2477 for (/* empty */; *names != NULL; ++names) {
2478 if (match_option(option, *names, tail)) {
2479 if (**tail == '\0' || tail_allowed && **tail == ':') {
2480 return true;
2481 }
2482 }
2483 }
2484 return false;
2485 }
2486
2487 bool Arguments::parse_uintx(const char* value,
2488 uintx* uintx_arg,
2489 uintx min_size) {
2490
2491 // Check the sign first since atomull() parses only unsigned values.
2492 bool value_is_positive = !(*value == '-');
2493
2494 if (value_is_positive) {
2495 julong n;
2496 bool good_return = atomull(value, &n);
2497 if (good_return) {
2498 bool above_minimum = n >= min_size;
2499 bool value_is_too_large = n > max_uintx;
2500
2501 if (above_minimum && !value_is_too_large) {
2502 *uintx_arg = n;
2503 return true;
2504 }
2505 }
2506 }
2507 return false;
2508 }
2509
2510 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2511 julong* long_arg,
2512 julong min_size) {
2513 if (!atomull(s, long_arg)) return arg_unreadable;
2514 return check_memory_size(*long_arg, min_size);
2515 }
2516
2517 // Parse JavaVMInitArgs structure
2518
2519 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2520 // For components of the system classpath.
2521 SysClassPath scp(Arguments::get_sysclasspath());
2522 bool scp_assembly_required = false;
2523
2524 // Save default settings for some mode flags
2525 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2526 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2527 Arguments::_ClipInlining = ClipInlining;
2528 Arguments::_BackgroundCompilation = BackgroundCompilation;
2529
2530 // Setup flags for mixed which is the default
2531 set_mode_flags(_mixed);
2532
2533 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2534 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2535 if (result != JNI_OK) {
2536 return result;
2537 }
2538
2539 // Parse JavaVMInitArgs structure passed in
2540 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2541 if (result != JNI_OK) {
2542 return result;
2543 }
2544
2545 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2546 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2547 if (result != JNI_OK) {
2548 return result;
2549 }
2550
2551 // Do final processing now that all arguments have been parsed
2552 result = finalize_vm_init_args(&scp, scp_assembly_required);
2553 if (result != JNI_OK) {
2554 return result;
2555 }
2556
2557 return JNI_OK;
2558 }
2559
2560 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2561 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2562 // are dealing with -agentpath (case where name is a path), otherwise with
2563 // -agentlib
2564 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2565 char *_name;
2566 const char *_hprof = "hprof", *_jdwp = "jdwp";
2567 size_t _len_hprof, _len_jdwp, _len_prefix;
2568
2569 if (is_path) {
2570 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2571 return false;
2572 }
2573
2574 _name++; // skip past last path separator
2575 _len_prefix = strlen(JNI_LIB_PREFIX);
2576
2577 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2578 return false;
2579 }
2580
2581 _name += _len_prefix;
2582 _len_hprof = strlen(_hprof);
2583 _len_jdwp = strlen(_jdwp);
2584
2585 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2586 _name += _len_hprof;
2587 }
2588 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2589 _name += _len_jdwp;
2590 }
2591 else {
2592 return false;
2593 }
2594
2595 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2596 return false;
2597 }
2598
2599 return true;
2600 }
2601
2602 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2603 return true;
2604 }
2605
2606 return false;
2607 }
2608
2609 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2610 SysClassPath* scp_p,
2611 bool* scp_assembly_required_p,
2612 Flag::Flags origin) {
2613 // Remaining part of option string
2614 const char* tail;
2615
2616 // iterate over arguments
2617 for (int index = 0; index < args->nOptions; index++) {
2618 bool is_absolute_path = false; // for -agentpath vs -agentlib
2619
2620 const JavaVMOption* option = args->options + index;
2621
2622 if (!match_option(option, "-Djava.class.path", &tail) &&
2623 !match_option(option, "-Dsun.java.command", &tail) &&
2624 !match_option(option, "-Dsun.java.launcher", &tail)) {
2625
2626 // add all jvm options to the jvm_args string. This string
2627 // is used later to set the java.vm.args PerfData string constant.
2628 // the -Djava.class.path and the -Dsun.java.command options are
2629 // omitted from jvm_args string as each have their own PerfData
2630 // string constant object.
2631 build_jvm_args(option->optionString);
2632 }
2633
2634 // -verbose:[class/gc/jni]
2635 if (match_option(option, "-verbose", &tail)) {
2636 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2637 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2638 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2639 } else if (!strcmp(tail, ":gc")) {
2640 FLAG_SET_CMDLINE(bool, PrintGC, true);
2641 } else if (!strcmp(tail, ":jni")) {
2642 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2643 }
2644 // -da / -ea / -disableassertions / -enableassertions
2645 // These accept an optional class/package name separated by a colon, e.g.,
2646 // -da:java.lang.Thread.
2647 } else if (match_option(option, user_assertion_options, &tail, true)) {
2648 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2649 if (*tail == '\0') {
2650 JavaAssertions::setUserClassDefault(enable);
2651 } else {
2652 assert(*tail == ':', "bogus match by match_option()");
2653 JavaAssertions::addOption(tail + 1, enable);
2654 }
2655 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2656 } else if (match_option(option, system_assertion_options, &tail, false)) {
2657 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2658 JavaAssertions::setSystemClassDefault(enable);
2659 // -bootclasspath:
2660 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2661 scp_p->reset_path(tail);
2662 *scp_assembly_required_p = true;
2663 // -bootclasspath/a:
2664 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2665 scp_p->add_suffix(tail);
2666 *scp_assembly_required_p = true;
2667 // -bootclasspath/p:
2668 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2669 scp_p->add_prefix(tail);
2670 *scp_assembly_required_p = true;
2671 // -Xrun
2672 } else if (match_option(option, "-Xrun", &tail)) {
2673 if (tail != NULL) {
2674 const char* pos = strchr(tail, ':');
2675 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2676 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2677 name[len] = '\0';
2678
2679 char *options = NULL;
2680 if(pos != NULL) {
2681 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2682 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2683 }
2684 #if !INCLUDE_JVMTI
2685 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2686 jio_fprintf(defaultStream::error_stream(),
2687 "Profiling and debugging agents are not supported in this VM\n");
2688 return JNI_ERR;
2689 }
2690 #endif // !INCLUDE_JVMTI
2691 add_init_library(name, options);
2692 }
2693 // -agentlib and -agentpath
2694 } else if (match_option(option, "-agentlib:", &tail) ||
2695 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2696 if(tail != NULL) {
2697 const char* pos = strchr(tail, '=');
2698 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2699 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2700 name[len] = '\0';
2701
2702 char *options = NULL;
2703 if(pos != NULL) {
2704 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2705 }
2706 #if !INCLUDE_JVMTI
2707 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2708 jio_fprintf(defaultStream::error_stream(),
2709 "Profiling and debugging agents are not supported in this VM\n");
2710 return JNI_ERR;
2711 }
2712 #endif // !INCLUDE_JVMTI
2713 add_init_agent(name, options, is_absolute_path);
2714 }
2715 // -javaagent
2716 } else if (match_option(option, "-javaagent:", &tail)) {
2717 #if !INCLUDE_JVMTI
2718 jio_fprintf(defaultStream::error_stream(),
2719 "Instrumentation agents are not supported in this VM\n");
2720 return JNI_ERR;
2721 #else
2722 if(tail != NULL) {
2723 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2724 add_init_agent("instrument", options, false);
2725 }
2726 #endif // !INCLUDE_JVMTI
2727 // -Xnoclassgc
2728 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2729 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2730 // -Xincgc: i-CMS
2731 } else if (match_option(option, "-Xincgc", &tail)) {
2732 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2733 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2734 // -Xnoincgc: no i-CMS
2735 } else if (match_option(option, "-Xnoincgc", &tail)) {
2736 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2737 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2738 // -Xconcgc
2739 } else if (match_option(option, "-Xconcgc", &tail)) {
2740 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2741 // -Xnoconcgc
2742 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2743 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2744 // -Xbatch
2745 } else if (match_option(option, "-Xbatch", &tail)) {
2746 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2747 // -Xmn for compatibility with other JVM vendors
2748 } else if (match_option(option, "-Xmn", &tail)) {
2749 julong long_initial_young_size = 0;
2750 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2751 if (errcode != arg_in_range) {
2752 jio_fprintf(defaultStream::error_stream(),
2753 "Invalid initial young generation size: %s\n", option->optionString);
2754 describe_range_error(errcode);
2755 return JNI_EINVAL;
2756 }
2757 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2758 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2759 // -Xms
2760 } else if (match_option(option, "-Xms", &tail)) {
2761 julong long_initial_heap_size = 0;
2762 // an initial heap size of 0 means automatically determine
2763 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2764 if (errcode != arg_in_range) {
2765 jio_fprintf(defaultStream::error_stream(),
2766 "Invalid initial heap size: %s\n", option->optionString);
2767 describe_range_error(errcode);
2768 return JNI_EINVAL;
2769 }
2770 set_min_heap_size((uintx)long_initial_heap_size);
2771 // Currently the minimum size and the initial heap sizes are the same.
2772 // Can be overridden with -XX:InitialHeapSize.
2773 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2774 // -Xmx
2775 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2776 julong long_max_heap_size = 0;
2777 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2778 if (errcode != arg_in_range) {
2779 jio_fprintf(defaultStream::error_stream(),
2780 "Invalid maximum heap size: %s\n", option->optionString);
2781 describe_range_error(errcode);
2782 return JNI_EINVAL;
2783 }
2784 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2785 // Xmaxf
2786 } else if (match_option(option, "-Xmaxf", &tail)) {
2787 char* err;
2788 int maxf = (int)(strtod(tail, &err) * 100);
2789 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2790 jio_fprintf(defaultStream::error_stream(),
2791 "Bad max heap free percentage size: %s\n",
2792 option->optionString);
2793 return JNI_EINVAL;
2794 } else {
2795 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2796 }
2797 // Xminf
2798 } else if (match_option(option, "-Xminf", &tail)) {
2799 char* err;
2800 int minf = (int)(strtod(tail, &err) * 100);
2801 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2802 jio_fprintf(defaultStream::error_stream(),
2803 "Bad min heap free percentage size: %s\n",
2804 option->optionString);
2805 return JNI_EINVAL;
2806 } else {
2807 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2808 }
2809 // -Xss
2810 } else if (match_option(option, "-Xss", &tail)) {
2811 julong long_ThreadStackSize = 0;
2812 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2813 if (errcode != arg_in_range) {
2814 jio_fprintf(defaultStream::error_stream(),
2815 "Invalid thread stack size: %s\n", option->optionString);
2816 describe_range_error(errcode);
2817 return JNI_EINVAL;
2818 }
2819 // Internally track ThreadStackSize in units of 1024 bytes.
2820 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2821 round_to((int)long_ThreadStackSize, K) / K);
2822 // -Xoss
2823 } else if (match_option(option, "-Xoss", &tail)) {
2824 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2825 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2826 julong long_CodeCacheExpansionSize = 0;
2827 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2828 if (errcode != arg_in_range) {
2829 jio_fprintf(defaultStream::error_stream(),
2830 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2831 os::vm_page_size()/K);
2832 return JNI_EINVAL;
2833 }
2834 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2835 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2836 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2837 julong long_ReservedCodeCacheSize = 0;
2838
2839 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2840 if (errcode != arg_in_range) {
2841 jio_fprintf(defaultStream::error_stream(),
2842 "Invalid maximum code cache size: %s.\n", option->optionString);
2843 return JNI_EINVAL;
2844 }
2845 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2846 //-XX:IncreaseFirstTierCompileThresholdAt=
2847 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2848 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2849 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2850 jio_fprintf(defaultStream::error_stream(),
2851 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2852 option->optionString);
2853 return JNI_EINVAL;
2854 }
2855 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2856 // -green
2857 } else if (match_option(option, "-green", &tail)) {
2858 jio_fprintf(defaultStream::error_stream(),
2859 "Green threads support not available\n");
2860 return JNI_EINVAL;
2861 // -native
2862 } else if (match_option(option, "-native", &tail)) {
2863 // HotSpot always uses native threads, ignore silently for compatibility
2864 // -Xsqnopause
2865 } else if (match_option(option, "-Xsqnopause", &tail)) {
2866 // EVM option, ignore silently for compatibility
2867 // -Xrs
2868 } else if (match_option(option, "-Xrs", &tail)) {
2869 // Classic/EVM option, new functionality
2870 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2871 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2872 // change default internal VM signals used - lower case for back compat
2873 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2874 // -Xoptimize
2875 } else if (match_option(option, "-Xoptimize", &tail)) {
2876 // EVM option, ignore silently for compatibility
2877 // -Xprof
2878 } else if (match_option(option, "-Xprof", &tail)) {
2879 #if INCLUDE_FPROF
2880 _has_profile = true;
2881 #else // INCLUDE_FPROF
2882 jio_fprintf(defaultStream::error_stream(),
2883 "Flat profiling is not supported in this VM.\n");
2884 return JNI_ERR;
2885 #endif // INCLUDE_FPROF
2886 // -Xconcurrentio
2887 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2888 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2889 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2890 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2891 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2892 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2893
2894 // -Xinternalversion
2895 } else if (match_option(option, "-Xinternalversion", &tail)) {
2896 jio_fprintf(defaultStream::output_stream(), "%s\n",
2897 VM_Version::internal_vm_info_string());
2898 vm_exit(0);
2899 #ifndef PRODUCT
2900 // -Xprintflags
2901 } else if (match_option(option, "-Xprintflags", &tail)) {
2902 CommandLineFlags::printFlags(tty, false);
2903 vm_exit(0);
2904 #endif
2905 // -D
2906 } else if (match_option(option, "-D", &tail)) {
2907 if (!add_property(tail)) {
2908 return JNI_ENOMEM;
2909 }
2910 // Out of the box management support
2911 if (match_option(option, "-Dcom.sun.management", &tail)) {
2912 #if INCLUDE_MANAGEMENT
2913 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2914 #else
2915 jio_fprintf(defaultStream::output_stream(),
2916 "-Dcom.sun.management is not supported in this VM.\n");
2917 return JNI_ERR;
2918 #endif
2919 }
2920 // -Xint
2921 } else if (match_option(option, "-Xint", &tail)) {
2922 set_mode_flags(_int);
2923 // -Xmixed
2924 } else if (match_option(option, "-Xmixed", &tail)) {
2925 set_mode_flags(_mixed);
2926 // -Xcomp
2927 } else if (match_option(option, "-Xcomp", &tail)) {
2928 // for testing the compiler; turn off all flags that inhibit compilation
2929 set_mode_flags(_comp);
2930 // -Xshare:dump
2931 } else if (match_option(option, "-Xshare:dump", &tail)) {
2932 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2933 set_mode_flags(_int); // Prevent compilation, which creates objects
2934 // -Xshare:on
2935 } else if (match_option(option, "-Xshare:on", &tail)) {
2936 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2937 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2938 // -Xshare:auto
2939 } else if (match_option(option, "-Xshare:auto", &tail)) {
2940 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2941 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2942 // -Xshare:off
2943 } else if (match_option(option, "-Xshare:off", &tail)) {
2944 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2945 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2946 // -Xverify
2947 } else if (match_option(option, "-Xverify", &tail)) {
2948 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2949 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2950 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2951 } else if (strcmp(tail, ":remote") == 0) {
2952 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2953 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2954 } else if (strcmp(tail, ":none") == 0) {
2955 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2956 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2957 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2958 return JNI_EINVAL;
2959 }
2960 // -Xdebug
2961 } else if (match_option(option, "-Xdebug", &tail)) {
2962 // note this flag has been used, then ignore
2963 set_xdebug_mode(true);
2964 // -Xnoagent
2965 } else if (match_option(option, "-Xnoagent", &tail)) {
2966 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2967 } else if (match_option(option, "-Xboundthreads", &tail)) {
2968 // Bind user level threads to kernel threads (Solaris only)
2969 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2970 } else if (match_option(option, "-Xloggc:", &tail)) {
2971 // Redirect GC output to the file. -Xloggc:<filename>
2972 // ostream_init_log(), when called will use this filename
2973 // to initialize a fileStream.
2974 _gc_log_filename = strdup(tail);
2975 if (!is_filename_valid(_gc_log_filename)) {
2976 jio_fprintf(defaultStream::output_stream(),
2977 "Invalid file name for use with -Xloggc: Filename can only contain the "
2978 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2979 "Note %%p or %%t can only be used once\n", _gc_log_filename);
2980 return JNI_EINVAL;
2981 }
2982 FLAG_SET_CMDLINE(bool, PrintGC, true);
2983 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2984
2985 // JNI hooks
2986 } else if (match_option(option, "-Xcheck", &tail)) {
2987 if (!strcmp(tail, ":jni")) {
2988 #if !INCLUDE_JNI_CHECK
2989 warning("JNI CHECKING is not supported in this VM");
2990 #else
2991 CheckJNICalls = true;
2992 #endif // INCLUDE_JNI_CHECK
2993 } else if (is_bad_option(option, args->ignoreUnrecognized,
2994 "check")) {
2995 return JNI_EINVAL;
2996 }
2997 } else if (match_option(option, "vfprintf", &tail)) {
2998 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2999 } else if (match_option(option, "exit", &tail)) {
3000 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3001 } else if (match_option(option, "abort", &tail)) {
3002 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3003 // -XX:+AggressiveHeap
3004 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
3005
3006 // This option inspects the machine and attempts to set various
3007 // parameters to be optimal for long-running, memory allocation
3008 // intensive jobs. It is intended for machines with large
3009 // amounts of cpu and memory.
3010
3011 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3012 // VM, but we may not be able to represent the total physical memory
3013 // available (like having 8gb of memory on a box but using a 32bit VM).
3014 // Thus, we need to make sure we're using a julong for intermediate
3015 // calculations.
3016 julong initHeapSize;
3017 julong total_memory = os::physical_memory();
3018
3019 if (total_memory < (julong)256*M) {
3020 jio_fprintf(defaultStream::error_stream(),
3021 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3022 vm_exit(1);
3023 }
3024
3025 // The heap size is half of available memory, or (at most)
3026 // all of possible memory less 160mb (leaving room for the OS
3027 // when using ISM). This is the maximum; because adaptive sizing
3028 // is turned on below, the actual space used may be smaller.
3029
3030 initHeapSize = MIN2(total_memory / (julong)2,
3031 total_memory - (julong)160*M);
3032
3033 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3034
3035 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3036 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3037 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3038 // Currently the minimum size and the initial heap sizes are the same.
3039 set_min_heap_size(initHeapSize);
3040 }
3041 if (FLAG_IS_DEFAULT(NewSize)) {
3042 // Make the young generation 3/8ths of the total heap.
3043 FLAG_SET_CMDLINE(uintx, NewSize,
3044 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3045 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3046 }
3047
3048 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3049 FLAG_SET_DEFAULT(UseLargePages, true);
3050 #endif
3051
3052 // Increase some data structure sizes for efficiency
3053 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3054 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3055 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3056
3057 // See the OldPLABSize comment below, but replace 'after promotion'
3058 // with 'after copying'. YoungPLABSize is the size of the survivor
3059 // space per-gc-thread buffers. The default is 4kw.
3060 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3061
3062 // OldPLABSize is the size of the buffers in the old gen that
3063 // UseParallelGC uses to promote live data that doesn't fit in the
3064 // survivor spaces. At any given time, there's one for each gc thread.
3065 // The default size is 1kw. These buffers are rarely used, since the
3066 // survivor spaces are usually big enough. For specjbb, however, there
3067 // are occasions when there's lots of live data in the young gen
3068 // and we end up promoting some of it. We don't have a definite
3069 // explanation for why bumping OldPLABSize helps, but the theory
3070 // is that a bigger PLAB results in retaining something like the
3071 // original allocation order after promotion, which improves mutator
3072 // locality. A minor effect may be that larger PLABs reduce the
3073 // number of PLAB allocation events during gc. The value of 8kw
3074 // was arrived at by experimenting with specjbb.
3075 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3076
3077 // Enable parallel GC and adaptive generation sizing
3078 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3079 FLAG_SET_DEFAULT(ParallelGCThreads,
3080 Abstract_VM_Version::parallel_worker_threads());
3081
3082 // Encourage steady state memory management
3083 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3084
3085 // This appears to improve mutator locality
3086 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3087
3088 // Get around early Solaris scheduling bug
3089 // (affinity vs other jobs on system)
3090 // but disallow DR and offlining (5008695).
3091 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3092
3093 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3094 // and the last option wins.
3095 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3096 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3097 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3098 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3099 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3100 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3101 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3102 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3103 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3104 uintx max_tenuring_thresh = 0;
3105 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3106 jio_fprintf(defaultStream::error_stream(),
3107 "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3108 }
3109 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3110
3111 if (MaxTenuringThreshold == 0) {
3112 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3113 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3114 } else {
3115 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3116 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3117 }
3118 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3119 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3120 jio_fprintf(defaultStream::error_stream(),
3121 "Please use CMSClassUnloadingEnabled in place of "
3122 "CMSPermGenSweepingEnabled in the future\n");
3123 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3124 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3125 jio_fprintf(defaultStream::error_stream(),
3126 "Please use -XX:+UseGCOverheadLimit in place of "
3127 "-XX:+UseGCTimeLimit in the future\n");
3128 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3129 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3130 jio_fprintf(defaultStream::error_stream(),
3131 "Please use -XX:-UseGCOverheadLimit in place of "
3132 "-XX:-UseGCTimeLimit in the future\n");
3133 // The TLE options are for compatibility with 1.3 and will be
3134 // removed without notice in a future release. These options
3135 // are not to be documented.
3136 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3137 // No longer used.
3138 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3139 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3140 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3141 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3142 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3143 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3144 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3145 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3146 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3147 // No longer used.
3148 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3149 julong long_tlab_size = 0;
3150 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3151 if (errcode != arg_in_range) {
3152 jio_fprintf(defaultStream::error_stream(),
3153 "Invalid TLAB size: %s\n", option->optionString);
3154 describe_range_error(errcode);
3155 return JNI_EINVAL;
3156 }
3157 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3158 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3159 // No longer used.
3160 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3161 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3162 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3163 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3164 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3165 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3166 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3167 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3168 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3169 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3170 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3171 #if defined(DTRACE_ENABLED)
3172 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3173 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3174 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3175 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3176 #else // defined(DTRACE_ENABLED)
3177 jio_fprintf(defaultStream::error_stream(),
3178 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3179 return JNI_EINVAL;
3180 #endif // defined(DTRACE_ENABLED)
3181 #ifdef ASSERT
3182 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3183 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3184 // disable scavenge before parallel mark-compact
3185 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3186 #endif
3187 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3188 julong cms_blocks_to_claim = (julong)atol(tail);
3189 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3190 jio_fprintf(defaultStream::error_stream(),
3191 "Please use -XX:OldPLABSize in place of "
3192 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3193 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3194 julong cms_blocks_to_claim = (julong)atol(tail);
3195 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3196 jio_fprintf(defaultStream::error_stream(),
3197 "Please use -XX:OldPLABSize in place of "
3198 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3199 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3200 julong old_plab_size = 0;
3201 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3202 if (errcode != arg_in_range) {
3203 jio_fprintf(defaultStream::error_stream(),
3204 "Invalid old PLAB size: %s\n", option->optionString);
3205 describe_range_error(errcode);
3206 return JNI_EINVAL;
3207 }
3208 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3209 jio_fprintf(defaultStream::error_stream(),
3210 "Please use -XX:OldPLABSize in place of "
3211 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3212 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3213 julong young_plab_size = 0;
3214 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3215 if (errcode != arg_in_range) {
3216 jio_fprintf(defaultStream::error_stream(),
3217 "Invalid young PLAB size: %s\n", option->optionString);
3218 describe_range_error(errcode);
3219 return JNI_EINVAL;
3220 }
3221 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3222 jio_fprintf(defaultStream::error_stream(),
3223 "Please use -XX:YoungPLABSize in place of "
3224 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3225 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3226 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3227 julong stack_size = 0;
3228 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3229 if (errcode != arg_in_range) {
3230 jio_fprintf(defaultStream::error_stream(),
3231 "Invalid mark stack size: %s\n", option->optionString);
3232 describe_range_error(errcode);
3233 return JNI_EINVAL;
3234 }
3235 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3236 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3237 julong max_stack_size = 0;
3238 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3239 if (errcode != arg_in_range) {
3240 jio_fprintf(defaultStream::error_stream(),
3241 "Invalid maximum mark stack size: %s\n",
3242 option->optionString);
3243 describe_range_error(errcode);
3244 return JNI_EINVAL;
3245 }
3246 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3247 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3248 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3249 uintx conc_threads = 0;
3250 if (!parse_uintx(tail, &conc_threads, 1)) {
3251 jio_fprintf(defaultStream::error_stream(),
3252 "Invalid concurrent threads: %s\n", option->optionString);
3253 return JNI_EINVAL;
3254 }
3255 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3256 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3257 julong max_direct_memory_size = 0;
3258 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3259 if (errcode != arg_in_range) {
3260 jio_fprintf(defaultStream::error_stream(),
3261 "Invalid maximum direct memory size: %s\n",
3262 option->optionString);
3263 describe_range_error(errcode);
3264 return JNI_EINVAL;
3265 }
3266 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3267 #if !INCLUDE_MANAGEMENT
3268 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3269 jio_fprintf(defaultStream::error_stream(),
3270 "ManagementServer is not supported in this VM.\n");
3271 return JNI_ERR;
3272 #endif // INCLUDE_MANAGEMENT
3273 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3274 // Skip -XX:Flags= since that case has already been handled
3275 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3276 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3277 return JNI_EINVAL;
3278 }
3279 }
3280 // Unknown option
3281 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3282 return JNI_ERR;
3283 }
3284 }
3285
3286 // Change the default value for flags which have different default values
3287 // when working with older JDKs.
3288 #ifdef LINUX
3289 if (JDK_Version::current().compare_major(6) <= 0 &&
3290 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3291 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3292 }
3293 #endif // LINUX
3294 return JNI_OK;
3295 }
3296
3297 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3298 // This must be done after all -D arguments have been processed.
3299 scp_p->expand_endorsed();
3300
3301 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3302 // Assemble the bootclasspath elements into the final path.
3303 Arguments::set_sysclasspath(scp_p->combined_path());
3304 }
3305
3306 // This must be done after all arguments have been processed.
3307 // java_compiler() true means set to "NONE" or empty.
3308 if (java_compiler() && !xdebug_mode()) {
3309 // For backwards compatibility, we switch to interpreted mode if
3310 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3311 // not specified.
3312 set_mode_flags(_int);
3313 }
3314 if (CompileThreshold == 0) {
3315 set_mode_flags(_int);
3316 }
3317
3318 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3319 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3320 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3321 }
3322
3323 #ifndef COMPILER2
3324 // Don't degrade server performance for footprint
3325 if (FLAG_IS_DEFAULT(UseLargePages) &&
3326 MaxHeapSize < LargePageHeapSizeThreshold) {
3327 // No need for large granularity pages w/small heaps.
3328 // Note that large pages are enabled/disabled for both the
3329 // Java heap and the code cache.
3330 FLAG_SET_DEFAULT(UseLargePages, false);
3331 }
3332
3333 #else
3334 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3335 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3336 }
3337 #endif
3338
3339 #ifndef TIERED
3340 // Tiered compilation is undefined.
3341 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3342 #endif
3343
3344 // If we are running in a headless jre, force java.awt.headless property
3345 // to be true unless the property has already been set.
3346 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3347 if (os::is_headless_jre()) {
3348 const char* headless = Arguments::get_property("java.awt.headless");
3349 if (headless == NULL) {
3350 char envbuffer[128];
3351 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3352 if (!add_property("java.awt.headless=true")) {
3353 return JNI_ENOMEM;
3354 }
3355 } else {
3356 char buffer[256];
3357 strcpy(buffer, "java.awt.headless=");
3358 strcat(buffer, envbuffer);
3359 if (!add_property(buffer)) {
3360 return JNI_ENOMEM;
3361 }
3362 }
3363 }
3364 }
3365
3366 if (!check_vm_args_consistency()) {
3367 return JNI_ERR;
3368 }
3369
3370 return JNI_OK;
3371 }
3372
3373 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3374 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3375 scp_assembly_required_p);
3376 }
3377
3378 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3379 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3380 scp_assembly_required_p);
3381 }
3382
3383 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3384 const int N_MAX_OPTIONS = 64;
3385 const int OPTION_BUFFER_SIZE = 1024;
3386 char buffer[OPTION_BUFFER_SIZE];
3387
3388 // The variable will be ignored if it exceeds the length of the buffer.
3389 // Don't check this variable if user has special privileges
3390 // (e.g. unix su command).
3391 if (os::getenv(name, buffer, sizeof(buffer)) &&
3392 !os::have_special_privileges()) {
3393 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3394 jio_fprintf(defaultStream::error_stream(),
3395 "Picked up %s: %s\n", name, buffer);
3396 char* rd = buffer; // pointer to the input string (rd)
3397 int i;
3398 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3399 while (isspace(*rd)) rd++; // skip whitespace
3400 if (*rd == 0) break; // we re done when the input string is read completely
3401
3402 // The output, option string, overwrites the input string.
3403 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3404 // input string (rd).
3405 char* wrt = rd;
3406
3407 options[i++].optionString = wrt; // Fill in option
3408 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3409 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3410 int quote = *rd; // matching quote to look for
3411 rd++; // don't copy open quote
3412 while (*rd != quote) { // include everything (even spaces) up until quote
3413 if (*rd == 0) { // string termination means unmatched string
3414 jio_fprintf(defaultStream::error_stream(),
3415 "Unmatched quote in %s\n", name);
3416 return JNI_ERR;
3417 }
3418 *wrt++ = *rd++; // copy to option string
3419 }
3420 rd++; // don't copy close quote
3421 } else {
3422 *wrt++ = *rd++; // copy to option string
3423 }
3424 }
3425 // Need to check if we're done before writing a NULL,
3426 // because the write could be to the byte that rd is pointing to.
3427 if (*rd++ == 0) {
3428 *wrt = 0;
3429 break;
3430 }
3431 *wrt = 0; // Zero terminate option
3432 }
3433 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3434 JavaVMInitArgs vm_args;
3435 vm_args.version = JNI_VERSION_1_2;
3436 vm_args.options = options;
3437 vm_args.nOptions = i;
3438 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3439
3440 if (PrintVMOptions) {
3441 const char* tail;
3442 for (int i = 0; i < vm_args.nOptions; i++) {
3443 const JavaVMOption *option = vm_args.options + i;
3444 if (match_option(option, "-XX:", &tail)) {
3445 logOption(tail);
3446 }
3447 }
3448 }
3449
3450 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3451 }
3452 return JNI_OK;
3453 }
3454
3455 void Arguments::set_shared_spaces_flags() {
3456 if (DumpSharedSpaces) {
3457 if (RequireSharedSpaces) {
3458 warning("cannot dump shared archive while using shared archive");
3459 }
3460 UseSharedSpaces = false;
3461 #ifdef _LP64
3462 if (!UseCompressedOops || !UseCompressedClassPointers) {
3463 vm_exit_during_initialization(
3464 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3465 }
3466 } else {
3467 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.
3468 if (!UseCompressedOops || !UseCompressedClassPointers) {
3469 no_shared_spaces();
3470 }
3471 #endif
3472 }
3473 }
3474
3475 #if !INCLUDE_ALL_GCS
3476 static void force_serial_gc() {
3477 FLAG_SET_DEFAULT(UseSerialGC, true);
3478 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3479 UNSUPPORTED_GC_OPTION(UseG1GC);
3480 UNSUPPORTED_GC_OPTION(UseParallelGC);
3481 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3482 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3483 UNSUPPORTED_GC_OPTION(UseParNewGC);
3484 }
3485 #endif // INCLUDE_ALL_GCS
3486
3487 // Sharing support
3488 // Construct the path to the archive
3489 static char* get_shared_archive_path() {
3490 char *shared_archive_path;
3491 if (SharedArchiveFile == NULL) {
3492 char jvm_path[JVM_MAXPATHLEN];
3493 os::jvm_path(jvm_path, sizeof(jvm_path));
3494 char *end = strrchr(jvm_path, *os::file_separator());
3495 if (end != NULL) *end = '\0';
3496 size_t jvm_path_len = strlen(jvm_path);
3497 size_t file_sep_len = strlen(os::file_separator());
3498 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3499 file_sep_len + 20, mtInternal);
3500 if (shared_archive_path != NULL) {
3501 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3502 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3503 strncat(shared_archive_path, "classes.jsa", 11);
3504 }
3505 } else {
3506 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3507 if (shared_archive_path != NULL) {
3508 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3509 }
3510 }
3511 return shared_archive_path;
3512 }
3513
3514 #ifndef PRODUCT
3515 // Determine whether LogVMOutput should be implicitly turned on.
3516 static bool use_vm_log() {
3517 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3518 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3519 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3520 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3521 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3522 return true;
3523 }
3524
3525 #ifdef COMPILER1
3526 if (PrintC1Statistics) {
3527 return true;
3528 }
3529 #endif // COMPILER1
3530
3531 #ifdef COMPILER2
3532 if (PrintOptoAssembly || PrintOptoStatistics) {
3533 return true;
3534 }
3535 #endif // COMPILER2
3536
3537 return false;
3538 }
3539 #endif // PRODUCT
3540
3541 // Parse entry point called from JNI_CreateJavaVM
3542
3543 jint Arguments::parse(const JavaVMInitArgs* args) {
3544
3545 // Remaining part of option string
3546 const char* tail;
3547
3548 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3549 const char* hotspotrc = ".hotspotrc";
3550 bool settings_file_specified = false;
3551 bool needs_hotspotrc_warning = false;
3552
3553 const char* flags_file;
3554 int index;
3555 for (index = 0; index < args->nOptions; index++) {
3556 const JavaVMOption *option = args->options + index;
3557 if (match_option(option, "-XX:Flags=", &tail)) {
3558 flags_file = tail;
3559 settings_file_specified = true;
3560 }
3561 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3562 PrintVMOptions = true;
3563 }
3564 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3565 PrintVMOptions = false;
3566 }
3567 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3568 IgnoreUnrecognizedVMOptions = true;
3569 }
3570 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3571 IgnoreUnrecognizedVMOptions = false;
3572 }
3573 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3574 CommandLineFlags::printFlags(tty, false);
3575 vm_exit(0);
3576 }
3577 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3578 #if INCLUDE_NMT
3579 MemTracker::init_tracking_options(tail);
3580 #else
3581 jio_fprintf(defaultStream::error_stream(),
3582 "Native Memory Tracking is not supported in this VM\n");
3583 return JNI_ERR;
3584 #endif
3585 }
3586
3587
3588 #ifndef PRODUCT
3589 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3590 CommandLineFlags::printFlags(tty, true);
3591 vm_exit(0);
3592 }
3593 #endif
3594 }
3595
3596 if (IgnoreUnrecognizedVMOptions) {
3597 // uncast const to modify the flag args->ignoreUnrecognized
3598 *(jboolean*)(&args->ignoreUnrecognized) = true;
3599 }
3600
3601 // Parse specified settings file
3602 if (settings_file_specified) {
3603 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3604 return JNI_EINVAL;
3605 }
3606 } else {
3607 #ifdef ASSERT
3608 // Parse default .hotspotrc settings file
3609 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3610 return JNI_EINVAL;
3611 }
3612 #else
3613 struct stat buf;
3614 if (os::stat(hotspotrc, &buf) == 0) {
3615 needs_hotspotrc_warning = true;
3616 }
3617 #endif
3618 }
3619
3620 if (PrintVMOptions) {
3621 for (index = 0; index < args->nOptions; index++) {
3622 const JavaVMOption *option = args->options + index;
3623 if (match_option(option, "-XX:", &tail)) {
3624 logOption(tail);
3625 }
3626 }
3627 }
3628
3629 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3630 jint result = parse_vm_init_args(args);
3631 if (result != JNI_OK) {
3632 return result;
3633 }
3634
3635 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3636 SharedArchivePath = get_shared_archive_path();
3637 if (SharedArchivePath == NULL) {
3638 return JNI_ENOMEM;
3639 }
3640
3641 // Delay warning until here so that we've had a chance to process
3642 // the -XX:-PrintWarnings flag
3643 if (needs_hotspotrc_warning) {
3644 warning("%s file is present but has been ignored. "
3645 "Run with -XX:Flags=%s to load the file.",
3646 hotspotrc, hotspotrc);
3647 }
3648
3649 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3650 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3651 #endif
3652
3653 #if INCLUDE_ALL_GCS
3654 #if (defined JAVASE_EMBEDDED || defined ARM)
3655 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3656 #endif
3657 #endif
3658
3659 #ifndef PRODUCT
3660 if (TraceBytecodesAt != 0) {
3661 TraceBytecodes = true;
3662 }
3663 if (CountCompiledCalls) {
3664 if (UseCounterDecay) {
3665 warning("UseCounterDecay disabled because CountCalls is set");
3666 UseCounterDecay = false;
3667 }
3668 }
3669 #endif // PRODUCT
3670
3671 if (ScavengeRootsInCode == 0) {
3672 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3673 warning("forcing ScavengeRootsInCode non-zero");
3674 }
3675 ScavengeRootsInCode = 1;
3676 }
3677
3678 if (PrintGCDetails) {
3679 // Turn on -verbose:gc options as well
3680 PrintGC = true;
3681 }
3682
3683 if (!JDK_Version::is_gte_jdk18x_version()) {
3684 // To avoid changing the log format for 7 updates this flag is only
3685 // true by default in JDK8 and above.
3686 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3687 FLAG_SET_DEFAULT(PrintGCCause, false);
3688 }
3689 }
3690
3691 // Set object alignment values.
3692 set_object_alignment();
3693
3694 #if !INCLUDE_ALL_GCS
3695 force_serial_gc();
3696 #endif // INCLUDE_ALL_GCS
3697 #if !INCLUDE_CDS
3698 if (DumpSharedSpaces || RequireSharedSpaces) {
3699 jio_fprintf(defaultStream::error_stream(),
3700 "Shared spaces are not supported in this VM\n");
3701 return JNI_ERR;
3702 }
3703 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3704 warning("Shared spaces are not supported in this VM");
3705 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3706 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3707 }
3708 no_shared_spaces();
3709 #endif // INCLUDE_CDS
3710
3711 return JNI_OK;
3712 }
3713
3714 jint Arguments::apply_ergo() {
3715
3716 // Set flags based on ergonomics.
3717 set_ergonomics_flags();
3718
3719 set_shared_spaces_flags();
3720
3721 // Check the GC selections again.
3722 if (!check_gc_consistency()) {
3723 return JNI_EINVAL;
3724 }
3725
3726 if (TieredCompilation) {
3727 set_tiered_flags();
3728 } else {
3729 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3730 if (CompilationPolicyChoice >= 2) {
3731 vm_exit_during_initialization(
3732 "Incompatible compilation policy selected", NULL);
3733 }
3734 }
3735 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
3736 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3737 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
3738 }
3739
3740
3741 // Set heap size based on available physical memory
3742 set_heap_size();
3743
3744 #if INCLUDE_ALL_GCS
3745 // Set per-collector flags
3746 if (UseParallelGC || UseParallelOldGC) {
3747 set_parallel_gc_flags();
3748 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
3749 set_cms_and_parnew_gc_flags();
3750 } else if (UseParNewGC) { // Skipped if CMS is set above
3751 set_parnew_gc_flags();
3752 } else if (UseG1GC) {
3753 set_g1_gc_flags();
3754 }
3755 check_deprecated_gcs();
3756 check_deprecated_gc_flags();
3757 if (AssumeMP && !UseSerialGC) {
3758 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3759 warning("If the number of processors is expected to increase from one, then"
3760 " you should configure the number of parallel GC threads appropriately"
3761 " using -XX:ParallelGCThreads=N");
3762 }
3763 }
3764 if (MinHeapFreeRatio == 100) {
3765 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
3766 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
3767 }
3768 #else // INCLUDE_ALL_GCS
3769 assert(verify_serial_gc_flags(), "SerialGC unset");
3770 #endif // INCLUDE_ALL_GCS
3771
3772 // Initialize Metaspace flags and alignments
3773 Metaspace::ergo_initialize();
3774
3775 // Set bytecode rewriting flags
3776 set_bytecode_flags();
3777
3778 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3779 set_aggressive_opts_flags();
3780
3781 // Turn off biased locking for locking debug mode flags,
3782 // which are subtly different from each other but neither works with
3783 // biased locking
3784 if (UseHeavyMonitors
3785 #ifdef COMPILER1
3786 || !UseFastLocking
3787 #endif // COMPILER1
3788 ) {
3789 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3790 // flag set to true on command line; warn the user that they
3791 // can't enable biased locking here
3792 warning("Biased Locking is not supported with locking debug flags"
3793 "; ignoring UseBiasedLocking flag." );
3794 }
3795 UseBiasedLocking = false;
3796 }
3797
3798 #ifdef ZERO
3799 // Clear flags not supported on zero.
3800 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3801 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3802 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3803 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3804 #endif // CC_INTERP
3805
3806 #ifdef COMPILER2
3807 if (!EliminateLocks) {
3808 EliminateNestedLocks = false;
3809 }
3810 if (!Inline) {
3811 IncrementalInline = false;
3812 }
3813 #ifndef PRODUCT
3814 if (!IncrementalInline) {
3815 AlwaysIncrementalInline = false;
3816 }
3817 #endif
3818 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3819 // nothing to use the profiling, turn if off
3820 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3821 }
3822 if (UseTypeSpeculation && FLAG_IS_DEFAULT(ReplaceInParentMaps)) {
3823 // Doing the replace in parent maps helps speculation
3824 FLAG_SET_DEFAULT(ReplaceInParentMaps, true);
3825 }
3826 #endif
3827
3828 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3829 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3830 DebugNonSafepoints = true;
3831 }
3832
3833 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3834 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3835 }
3836
3837 #ifndef PRODUCT
3838 if (CompileTheWorld) {
3839 // Force NmethodSweeper to sweep whole CodeCache each time.
3840 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3841 NmethodSweepFraction = 1;
3842 }
3843 }
3844
3845 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3846 if (use_vm_log()) {
3847 LogVMOutput = true;
3848 }
3849 }
3850 #endif // PRODUCT
3851
3852 if (PrintCommandLineFlags) {
3853 CommandLineFlags::printSetFlags(tty);
3854 }
3855
3856 // Apply CPU specific policy for the BiasedLocking
3857 if (UseBiasedLocking) {
3858 if (!VM_Version::use_biased_locking() &&
3859 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3860 UseBiasedLocking = false;
3861 }
3862 }
3863 #ifdef COMPILER2
3864 if (!UseBiasedLocking || EmitSync != 0) {
3865 UseOptoBiasInlining = false;
3866 }
3867 #endif
3868
3869 return JNI_OK;
3870 }
3871
3872 jint Arguments::adjust_after_os() {
3873 if (UseNUMA) {
3874 if (UseParallelGC || UseParallelOldGC) {
3875 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3876 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3877 }
3878 }
3879 // UseNUMAInterleaving is set to ON for all collectors and
3880 // platforms when UseNUMA is set to ON. NUMA-aware collectors
3881 // such as the parallel collector for Linux and Solaris will
3882 // interleave old gen and survivor spaces on top of NUMA
3883 // allocation policy for the eden space.
3884 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
3885 // all platforms and ParallelGC on Windows will interleave all
3886 // of the heap spaces across NUMA nodes.
3887 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
3888 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
3889 }
3890 }
3891 return JNI_OK;
3892 }
3893
3894 int Arguments::PropertyList_count(SystemProperty* pl) {
3895 int count = 0;
3896 while(pl != NULL) {
3897 count++;
3898 pl = pl->next();
3899 }
3900 return count;
3901 }
3902
3903 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3904 assert(key != NULL, "just checking");
3905 SystemProperty* prop;
3906 for (prop = pl; prop != NULL; prop = prop->next()) {
3907 if (strcmp(key, prop->key()) == 0) return prop->value();
3908 }
3909 return NULL;
3910 }
3911
3912 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3913 int count = 0;
3914 const char* ret_val = NULL;
3915
3916 while(pl != NULL) {
3917 if(count >= index) {
3918 ret_val = pl->key();
3919 break;
3920 }
3921 count++;
3922 pl = pl->next();
3923 }
3924
3925 return ret_val;
3926 }
3927
3928 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3929 int count = 0;
3930 char* ret_val = NULL;
3931
3932 while(pl != NULL) {
3933 if(count >= index) {
3934 ret_val = pl->value();
3935 break;
3936 }
3937 count++;
3938 pl = pl->next();
3939 }
3940
3941 return ret_val;
3942 }
3943
3944 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3945 SystemProperty* p = *plist;
3946 if (p == NULL) {
3947 *plist = new_p;
3948 } else {
3949 while (p->next() != NULL) {
3950 p = p->next();
3951 }
3952 p->set_next(new_p);
3953 }
3954 }
3955
3956 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3957 if (plist == NULL)
3958 return;
3959
3960 SystemProperty* new_p = new SystemProperty(k, v, true);
3961 PropertyList_add(plist, new_p);
3962 }
3963
3964 // This add maintains unique property key in the list.
3965 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3966 if (plist == NULL)
3967 return;
3968
3969 // If property key exist then update with new value.
3970 SystemProperty* prop;
3971 for (prop = *plist; prop != NULL; prop = prop->next()) {
3972 if (strcmp(k, prop->key()) == 0) {
3973 if (append) {
3974 prop->append_value(v);
3975 } else {
3976 prop->set_value(v);
3977 }
3978 return;
3979 }
3980 }
3981
3982 PropertyList_add(plist, k, v);
3983 }
3984
3985 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3986 // Returns true if all of the source pointed by src has been copied over to
3987 // the destination buffer pointed by buf. Otherwise, returns false.
3988 // Notes:
3989 // 1. If the length (buflen) of the destination buffer excluding the
3990 // NULL terminator character is not long enough for holding the expanded
3991 // pid characters, it also returns false instead of returning the partially
3992 // expanded one.
3993 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3994 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3995 char* buf, size_t buflen) {
3996 const char* p = src;
3997 char* b = buf;
3998 const char* src_end = &src[srclen];
3999 char* buf_end = &buf[buflen - 1];
4000
4001 while (p < src_end && b < buf_end) {
4002 if (*p == '%') {
4003 switch (*(++p)) {
4004 case '%': // "%%" ==> "%"
4005 *b++ = *p++;
4006 break;
4007 case 'p': { // "%p" ==> current process id
4008 // buf_end points to the character before the last character so
4009 // that we could write '\0' to the end of the buffer.
4010 size_t buf_sz = buf_end - b + 1;
4011 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4012
4013 // if jio_snprintf fails or the buffer is not long enough to hold
4014 // the expanded pid, returns false.
4015 if (ret < 0 || ret >= (int)buf_sz) {
4016 return false;
4017 } else {
4018 b += ret;
4019 assert(*b == '\0', "fail in copy_expand_pid");
4020 if (p == src_end && b == buf_end + 1) {
4021 // reach the end of the buffer.
4022 return true;
4023 }
4024 }
4025 p++;
4026 break;
4027 }
4028 default :
4029 *b++ = '%';
4030 }
4031 } else {
4032 *b++ = *p++;
4033 }
4034 }
4035 *b = '\0';
4036 return (p == src_end); // return false if not all of the source was copied
4037 }