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/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "compiler/compilerOracle.hpp"
31 #include "memory/allocation.inline.hpp"
32 #include "memory/cardTableRS.hpp"
33 #include "memory/genCollectedHeap.hpp"
34 #include "memory/referenceProcessor.hpp"
35 #include "memory/universe.inline.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "prims/jvmtiExport.hpp"
38 #include "runtime/arguments.hpp"
39 #include "runtime/arguments_ext.hpp"
40 #include "runtime/globals_extension.hpp"
41 #include "runtime/java.hpp"
42 #include "runtime/os.hpp"
43 #include "runtime/vm_version.hpp"
44 #include "services/management.hpp"
45 #include "services/memTracker.hpp"
46 #include "utilities/defaultStream.hpp"
47 #include "utilities/macros.hpp"
48 #include "utilities/stringUtils.hpp"
49 #include "utilities/taskqueue.hpp"
50 #if INCLUDE_ALL_GCS
51 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
52 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
53 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
54 #endif // INCLUDE_ALL_GCS
55
56 // Note: This is a special bug reporting site for the JVM
57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
58 #define DEFAULT_JAVA_LAUNCHER "generic"
59
60 // Disable options not supported in this release, with a warning if they
61 // were explicitly requested on the command-line
62 #define UNSUPPORTED_OPTION(opt, description) \
63 do { \
64 if (opt) { \
65 if (FLAG_IS_CMDLINE(opt)) { \
66 warning(description " is disabled in this release."); \
67 } \
68 FLAG_SET_DEFAULT(opt, false); \
69 } \
70 } while(0)
71
72 #define UNSUPPORTED_GC_OPTION(gc) \
73 do { \
74 if (gc) { \
75 if (FLAG_IS_CMDLINE(gc)) { \
76 warning(#gc " is not supported in this VM. Using Serial GC."); \
77 } \
78 FLAG_SET_DEFAULT(gc, false); \
79 } \
80 } while(0)
81
82 char** Arguments::_jvm_flags_array = NULL;
83 int Arguments::_num_jvm_flags = 0;
84 char** Arguments::_jvm_args_array = NULL;
85 int Arguments::_num_jvm_args = 0;
86 char* Arguments::_java_command = NULL;
87 SystemProperty* Arguments::_system_properties = NULL;
88 const char* Arguments::_gc_log_filename = NULL;
89 bool Arguments::_has_profile = false;
90 size_t Arguments::_conservative_max_heap_alignment = 0;
91 uintx Arguments::_min_heap_size = 0;
92 uintx Arguments::_min_heap_free_ratio = 0;
93 uintx Arguments::_max_heap_free_ratio = 0;
94 Arguments::Mode Arguments::_mode = _mixed;
95 bool Arguments::_java_compiler = false;
96 bool Arguments::_xdebug_mode = false;
97 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
98 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
99 int Arguments::_sun_java_launcher_pid = -1;
100 bool Arguments::_sun_java_launcher_is_altjvm = false;
101
102 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
103 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
104 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
105 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
106 bool Arguments::_ClipInlining = ClipInlining;
107
108 char* Arguments::SharedArchivePath = NULL;
109
110 AgentLibraryList Arguments::_libraryList;
111 AgentLibraryList Arguments::_agentList;
112
113 abort_hook_t Arguments::_abort_hook = NULL;
114 exit_hook_t Arguments::_exit_hook = NULL;
115 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
116
117
118 SystemProperty *Arguments::_java_ext_dirs = NULL;
119 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
120 SystemProperty *Arguments::_sun_boot_library_path = NULL;
121 SystemProperty *Arguments::_java_library_path = NULL;
122 SystemProperty *Arguments::_java_home = NULL;
123 SystemProperty *Arguments::_java_class_path = NULL;
124 SystemProperty *Arguments::_sun_boot_class_path = NULL;
125
126 char* Arguments::_meta_index_path = NULL;
127 char* Arguments::_meta_index_dir = NULL;
128
129 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
130
131 static bool match_option(const JavaVMOption *option, const char* name,
132 const char** tail) {
133 int len = (int)strlen(name);
134 if (strncmp(option->optionString, name, len) == 0) {
135 *tail = option->optionString + len;
136 return true;
137 } else {
138 return false;
139 }
140 }
141
142 static void logOption(const char* opt) {
143 if (PrintVMOptions) {
144 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
145 }
146 }
147
148 // Process java launcher properties.
149 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
150 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
151 // sun.java.launcher.pid is defined.
152 // Must do this before setting up other system properties,
153 // as some of them may depend on launcher type.
154 for (int index = 0; index < args->nOptions; index++) {
155 const JavaVMOption* option = args->options + index;
156 const char* tail;
157
158 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
159 process_java_launcher_argument(tail, option->extraInfo);
160 continue;
161 }
162 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
163 if (strcmp(tail, "true") == 0) {
164 _sun_java_launcher_is_altjvm = true;
165 }
166 continue;
167 }
168 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
169 _sun_java_launcher_pid = atoi(tail);
170 continue;
171 }
172 }
173 }
174
175 // Initialize system properties key and value.
176 void Arguments::init_system_properties() {
177
178 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
179 "Java Virtual Machine Specification", false));
180 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
181 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
182 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
183
184 // Following are JVMTI agent writable properties.
185 // Properties values are set to NULL and they are
186 // os specific they are initialized in os::init_system_properties_values().
187 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
188 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
189 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
190 _java_library_path = new SystemProperty("java.library.path", NULL, true);
191 _java_home = new SystemProperty("java.home", NULL, true);
192 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
193
194 _java_class_path = new SystemProperty("java.class.path", "", true);
195
196 // Add to System Property list.
197 PropertyList_add(&_system_properties, _java_ext_dirs);
198 PropertyList_add(&_system_properties, _java_endorsed_dirs);
199 PropertyList_add(&_system_properties, _sun_boot_library_path);
200 PropertyList_add(&_system_properties, _java_library_path);
201 PropertyList_add(&_system_properties, _java_home);
202 PropertyList_add(&_system_properties, _java_class_path);
203 PropertyList_add(&_system_properties, _sun_boot_class_path);
204
205 // Set OS specific system properties values
206 os::init_system_properties_values();
207 }
208
209
210 // Update/Initialize System properties after JDK version number is known
211 void Arguments::init_version_specific_system_properties() {
212 enum { bufsz = 16 };
213 char buffer[bufsz];
214 const char* spec_vendor = "Sun Microsystems Inc.";
215 uint32_t spec_version = 0;
216
217 spec_vendor = "Oracle Corporation";
218 spec_version = JDK_Version::current().major_version();
219 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
220
221 PropertyList_add(&_system_properties,
222 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
223 PropertyList_add(&_system_properties,
224 new SystemProperty("java.vm.specification.version", buffer, false));
225 PropertyList_add(&_system_properties,
226 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
227 }
228
229 /**
230 * Provide a slightly more user-friendly way of eliminating -XX flags.
231 * When a flag is eliminated, it can be added to this list in order to
232 * continue accepting this flag on the command-line, while issuing a warning
233 * and ignoring the value. Once the JDK version reaches the 'accept_until'
234 * limit, we flatly refuse to admit the existence of the flag. This allows
235 * a flag to die correctly over JDK releases using HSX.
236 */
237 typedef struct {
238 const char* name;
239 JDK_Version obsoleted_in; // when the flag went away
240 JDK_Version accept_until; // which version to start denying the existence
241 } ObsoleteFlag;
242
243 static ObsoleteFlag obsolete_jvm_flags[] = {
244 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
245 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
246 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
247 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
248 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
249 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
250 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
251 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
252 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
253 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
254 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
255 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
256 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
257 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
258 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
259 { "DefaultInitialRAMFraction",
260 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
261 { "UseDepthFirstScavengeOrder",
262 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
263 { "HandlePromotionFailure",
264 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
265 { "MaxLiveObjectEvacuationRatio",
266 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
267 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
268 { "UseParallelOldGCCompacting",
269 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
270 { "UseParallelDensePrefixUpdate",
271 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
272 { "UseParallelOldGCDensePrefix",
273 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
274 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
275 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
276 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
277 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
278 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
279 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
280 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
281 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
282 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
283 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
284 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
285 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
286 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
293 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
294 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
295 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
296 #ifdef PRODUCT
297 { "DesiredMethodLimit",
298 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
299 #endif // PRODUCT
300 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) },
301 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
302 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
303 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
304 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) },
305 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) },
306 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
307 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) },
308 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
309 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) },
310 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) },
311 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) },
312 #ifndef ZERO
313 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
314 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
315 #endif // ZERO
316 { NULL, JDK_Version(0), JDK_Version(0) }
317 };
318
319 // Returns true if the flag is obsolete and fits into the range specified
320 // for being ignored. In the case that the flag is ignored, the 'version'
321 // value is filled in with the version number when the flag became
322 // obsolete so that that value can be displayed to the user.
323 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
324 int i = 0;
325 assert(version != NULL, "Must provide a version buffer");
326 while (obsolete_jvm_flags[i].name != NULL) {
327 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
328 // <flag>=xxx form
329 // [-|+]<flag> form
330 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
331 ((s[0] == '+' || s[0] == '-') &&
332 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
333 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
334 *version = flag_status.obsoleted_in;
335 return true;
336 }
337 }
338 i++;
339 }
340 return false;
341 }
342
343 // Constructs the system class path (aka boot class path) from the following
344 // components, in order:
345 //
346 // prefix // from -Xbootclasspath/p:...
347 // endorsed // the expansion of -Djava.endorsed.dirs=...
348 // base // from os::get_system_properties() or -Xbootclasspath=
349 // suffix // from -Xbootclasspath/a:...
350 //
351 // java.endorsed.dirs is a list of directories; any jar or zip files in the
352 // directories are added to the sysclasspath just before the base.
353 //
354 // This could be AllStatic, but it isn't needed after argument processing is
355 // complete.
356 class SysClassPath: public StackObj {
357 public:
358 SysClassPath(const char* base);
359 ~SysClassPath();
360
361 inline void set_base(const char* base);
362 inline void add_prefix(const char* prefix);
363 inline void add_suffix_to_prefix(const char* suffix);
364 inline void add_suffix(const char* suffix);
365 inline void reset_path(const char* base);
366
367 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
368 // property. Must be called after all command-line arguments have been
369 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
370 // combined_path().
371 void expand_endorsed();
372
373 inline const char* get_base() const { return _items[_scp_base]; }
374 inline const char* get_prefix() const { return _items[_scp_prefix]; }
375 inline const char* get_suffix() const { return _items[_scp_suffix]; }
376 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
377
378 // Combine all the components into a single c-heap-allocated string; caller
379 // must free the string if/when no longer needed.
380 char* combined_path();
381
382 private:
383 // Utility routines.
384 static char* add_to_path(const char* path, const char* str, bool prepend);
385 static char* add_jars_to_path(char* path, const char* directory);
386
387 inline void reset_item_at(int index);
388
389 // Array indices for the items that make up the sysclasspath. All except the
390 // base are allocated in the C heap and freed by this class.
391 enum {
392 _scp_prefix, // from -Xbootclasspath/p:...
393 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
394 _scp_base, // the default sysclasspath
395 _scp_suffix, // from -Xbootclasspath/a:...
396 _scp_nitems // the number of items, must be last.
397 };
398
399 const char* _items[_scp_nitems];
400 DEBUG_ONLY(bool _expansion_done;)
401 };
402
403 SysClassPath::SysClassPath(const char* base) {
404 memset(_items, 0, sizeof(_items));
405 _items[_scp_base] = base;
406 DEBUG_ONLY(_expansion_done = false;)
407 }
408
409 SysClassPath::~SysClassPath() {
410 // Free everything except the base.
411 for (int i = 0; i < _scp_nitems; ++i) {
412 if (i != _scp_base) reset_item_at(i);
413 }
414 DEBUG_ONLY(_expansion_done = false;)
415 }
416
417 inline void SysClassPath::set_base(const char* base) {
418 _items[_scp_base] = base;
419 }
420
421 inline void SysClassPath::add_prefix(const char* prefix) {
422 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
423 }
424
425 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
426 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
427 }
428
429 inline void SysClassPath::add_suffix(const char* suffix) {
430 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
431 }
432
433 inline void SysClassPath::reset_item_at(int index) {
434 assert(index < _scp_nitems && index != _scp_base, "just checking");
435 if (_items[index] != NULL) {
436 FREE_C_HEAP_ARRAY(char, _items[index]);
437 _items[index] = NULL;
438 }
439 }
440
441 inline void SysClassPath::reset_path(const char* base) {
442 // Clear the prefix and suffix.
443 reset_item_at(_scp_prefix);
444 reset_item_at(_scp_suffix);
445 set_base(base);
446 }
447
448 //------------------------------------------------------------------------------
449
450 void SysClassPath::expand_endorsed() {
451 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
452
453 const char* path = Arguments::get_property("java.endorsed.dirs");
454 if (path == NULL) {
455 path = Arguments::get_endorsed_dir();
456 assert(path != NULL, "no default for java.endorsed.dirs");
457 }
458
459 char* expanded_path = NULL;
460 const char separator = *os::path_separator();
461 const char* const end = path + strlen(path);
462 while (path < end) {
463 const char* tmp_end = strchr(path, separator);
464 if (tmp_end == NULL) {
465 expanded_path = add_jars_to_path(expanded_path, path);
466 path = end;
467 } else {
468 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
469 memcpy(dirpath, path, tmp_end - path);
470 dirpath[tmp_end - path] = '\0';
471 expanded_path = add_jars_to_path(expanded_path, dirpath);
472 FREE_C_HEAP_ARRAY(char, dirpath);
473 path = tmp_end + 1;
474 }
475 }
476 _items[_scp_endorsed] = expanded_path;
477 DEBUG_ONLY(_expansion_done = true;)
478 }
479
480 // Combine the bootclasspath elements, some of which may be null, into a single
481 // c-heap-allocated string.
482 char* SysClassPath::combined_path() {
483 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
484 assert(_expansion_done, "must call expand_endorsed() first.");
485
486 size_t lengths[_scp_nitems];
487 size_t total_len = 0;
488
489 const char separator = *os::path_separator();
490
491 // Get the lengths.
492 int i;
493 for (i = 0; i < _scp_nitems; ++i) {
494 if (_items[i] != NULL) {
495 lengths[i] = strlen(_items[i]);
496 // Include space for the separator char (or a NULL for the last item).
497 total_len += lengths[i] + 1;
498 }
499 }
500 assert(total_len > 0, "empty sysclasspath not allowed");
501
502 // Copy the _items to a single string.
503 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
504 char* cp_tmp = cp;
505 for (i = 0; i < _scp_nitems; ++i) {
506 if (_items[i] != NULL) {
507 memcpy(cp_tmp, _items[i], lengths[i]);
508 cp_tmp += lengths[i];
509 *cp_tmp++ = separator;
510 }
511 }
512 *--cp_tmp = '\0'; // Replace the extra separator.
513 return cp;
514 }
515
516 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
517 char*
518 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
519 char *cp;
520
521 assert(str != NULL, "just checking");
522 if (path == NULL) {
523 size_t len = strlen(str) + 1;
524 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
525 memcpy(cp, str, len); // copy the trailing null
526 } else {
527 const char separator = *os::path_separator();
528 size_t old_len = strlen(path);
529 size_t str_len = strlen(str);
530 size_t len = old_len + str_len + 2;
531
532 if (prepend) {
533 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
534 char* cp_tmp = cp;
535 memcpy(cp_tmp, str, str_len);
536 cp_tmp += str_len;
537 *cp_tmp = separator;
538 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
539 FREE_C_HEAP_ARRAY(char, path);
540 } else {
541 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
542 char* cp_tmp = cp + old_len;
543 *cp_tmp = separator;
544 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
545 }
546 }
547 return cp;
548 }
549
550 // Scan the directory and append any jar or zip files found to path.
551 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
552 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
553 DIR* dir = os::opendir(directory);
554 if (dir == NULL) return path;
555
556 char dir_sep[2] = { '\0', '\0' };
557 size_t directory_len = strlen(directory);
558 const char fileSep = *os::file_separator();
559 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
560
561 /* Scan the directory for jars/zips, appending them to path. */
562 struct dirent *entry;
563 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
564 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
565 const char* name = entry->d_name;
566 const char* ext = name + strlen(name) - 4;
567 bool isJarOrZip = ext > name &&
568 (os::file_name_strcmp(ext, ".jar") == 0 ||
569 os::file_name_strcmp(ext, ".zip") == 0);
570 if (isJarOrZip) {
571 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
572 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
573 path = add_to_path(path, jarpath, false);
574 FREE_C_HEAP_ARRAY(char, jarpath);
575 }
576 }
577 FREE_C_HEAP_ARRAY(char, dbuf);
578 os::closedir(dir);
579 return path;
580 }
581
582 // Parses a memory size specification string.
583 static bool atomull(const char *s, julong* result) {
584 julong n = 0;
585 int args_read = 0;
586 bool is_hex = false;
587 // Skip leading 0[xX] for hexadecimal
588 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
589 s += 2;
590 is_hex = true;
591 args_read = sscanf(s, JULONG_FORMAT_X, &n);
592 } else {
593 args_read = sscanf(s, JULONG_FORMAT, &n);
594 }
595 if (args_read != 1) {
596 return false;
597 }
598 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
599 s++;
600 }
601 // 4705540: illegal if more characters are found after the first non-digit
602 if (strlen(s) > 1) {
603 return false;
604 }
605 switch (*s) {
606 case 'T': case 't':
607 *result = n * G * K;
608 // Check for overflow.
609 if (*result/((julong)G * K) != n) return false;
610 return true;
611 case 'G': case 'g':
612 *result = n * G;
613 if (*result/G != n) return false;
614 return true;
615 case 'M': case 'm':
616 *result = n * M;
617 if (*result/M != n) return false;
618 return true;
619 case 'K': case 'k':
620 *result = n * K;
621 if (*result/K != n) return false;
622 return true;
623 case '\0':
624 *result = n;
625 return true;
626 default:
627 return false;
628 }
629 }
630
631 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
632 if (size < min_size) return arg_too_small;
633 // Check that size will fit in a size_t (only relevant on 32-bit)
634 if (size > max_uintx) return arg_too_big;
635 return arg_in_range;
636 }
637
638 // Describe an argument out of range error
639 void Arguments::describe_range_error(ArgsRange errcode) {
640 switch(errcode) {
641 case arg_too_big:
642 jio_fprintf(defaultStream::error_stream(),
643 "The specified size exceeds the maximum "
644 "representable size.\n");
645 break;
646 case arg_too_small:
647 case arg_unreadable:
648 case arg_in_range:
649 // do nothing for now
650 break;
651 default:
652 ShouldNotReachHere();
653 }
654 }
655
656 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
657 return CommandLineFlags::boolAtPut(name, &value, origin);
658 }
659
660 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
661 double v;
662 if (sscanf(value, "%lf", &v) != 1) {
663 return false;
664 }
665
666 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
667 return true;
668 }
669 return false;
670 }
671
672 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
673 julong v;
674 intx intx_v;
675 bool is_neg = false;
676 // Check the sign first since atomull() parses only unsigned values.
677 if (*value == '-') {
678 if (!CommandLineFlags::intxAt(name, &intx_v)) {
679 return false;
680 }
681 value++;
682 is_neg = true;
683 }
684 if (!atomull(value, &v)) {
685 return false;
686 }
687 intx_v = (intx) v;
688 if (is_neg) {
689 intx_v = -intx_v;
690 }
691 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
692 return true;
693 }
694 uintx uintx_v = (uintx) v;
695 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
696 return true;
697 }
698 uint64_t uint64_t_v = (uint64_t) v;
699 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
700 return true;
701 }
702 size_t size_t_v = (size_t) v;
703 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) {
704 return true;
705 }
706 return false;
707 }
708
709 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
710 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
711 // Contract: CommandLineFlags always returns a pointer that needs freeing.
712 FREE_C_HEAP_ARRAY(char, value);
713 return true;
714 }
715
716 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
717 const char* old_value = "";
718 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
719 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
720 size_t new_len = strlen(new_value);
721 const char* value;
722 char* free_this_too = NULL;
723 if (old_len == 0) {
724 value = new_value;
725 } else if (new_len == 0) {
726 value = old_value;
727 } else {
728 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
729 // each new setting adds another LINE to the switch:
730 sprintf(buf, "%s\n%s", old_value, new_value);
731 value = buf;
732 free_this_too = buf;
733 }
734 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
735 // CommandLineFlags always returns a pointer that needs freeing.
736 FREE_C_HEAP_ARRAY(char, value);
737 if (free_this_too != NULL) {
738 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
739 FREE_C_HEAP_ARRAY(char, free_this_too);
740 }
741 return true;
742 }
743
744 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
745
746 // range of acceptable characters spelled out for portability reasons
747 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
748 #define BUFLEN 255
749 char name[BUFLEN+1];
750 char dummy;
751
752 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
753 return set_bool_flag(name, false, origin);
754 }
755 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
756 return set_bool_flag(name, true, origin);
757 }
758
759 char punct;
760 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
761 const char* value = strchr(arg, '=') + 1;
762 Flag* flag = Flag::find_flag(name, strlen(name));
763 if (flag != NULL && flag->is_ccstr()) {
764 if (flag->ccstr_accumulates()) {
765 return append_to_string_flag(name, value, origin);
766 } else {
767 if (value[0] == '\0') {
768 value = NULL;
769 }
770 return set_string_flag(name, value, origin);
771 }
772 }
773 }
774
775 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
776 const char* value = strchr(arg, '=') + 1;
777 // -XX:Foo:=xxx will reset the string flag to the given value.
778 if (value[0] == '\0') {
779 value = NULL;
780 }
781 return set_string_flag(name, value, origin);
782 }
783
784 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
785 #define SIGNED_NUMBER_RANGE "[-0123456789]"
786 #define NUMBER_RANGE "[0123456789]"
787 char value[BUFLEN + 1];
788 char value2[BUFLEN + 1];
789 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
790 // Looks like a floating-point number -- try again with more lenient format string
791 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
792 return set_fp_numeric_flag(name, value, origin);
793 }
794 }
795
796 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
797 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
798 return set_numeric_flag(name, value, origin);
799 }
800
801 return false;
802 }
803
804 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
805 assert(bldarray != NULL, "illegal argument");
806
807 if (arg == NULL) {
808 return;
809 }
810
811 int new_count = *count + 1;
812
813 // expand the array and add arg to the last element
814 if (*bldarray == NULL) {
815 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
816 } else {
817 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
818 }
819 (*bldarray)[*count] = os::strdup_check_oom(arg);
820 *count = new_count;
821 }
822
823 void Arguments::build_jvm_args(const char* arg) {
824 add_string(&_jvm_args_array, &_num_jvm_args, arg);
825 }
826
827 void Arguments::build_jvm_flags(const char* arg) {
828 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
829 }
830
831 // utility function to return a string that concatenates all
832 // strings in a given char** array
833 const char* Arguments::build_resource_string(char** args, int count) {
834 if (args == NULL || count == 0) {
835 return NULL;
836 }
837 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
838 for (int i = 1; i < count; i++) {
839 length += strlen(args[i]) + 1; // add 1 for a space
840 }
841 char* s = NEW_RESOURCE_ARRAY(char, length);
842 strcpy(s, args[0]);
843 for (int j = 1; j < count; j++) {
844 strcat(s, " ");
845 strcat(s, args[j]);
846 }
847 return (const char*) s;
848 }
849
850 void Arguments::print_on(outputStream* st) {
851 st->print_cr("VM Arguments:");
852 if (num_jvm_flags() > 0) {
853 st->print("jvm_flags: "); print_jvm_flags_on(st);
854 }
855 if (num_jvm_args() > 0) {
856 st->print("jvm_args: "); print_jvm_args_on(st);
857 }
858 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
859 if (_java_class_path != NULL) {
860 char* path = _java_class_path->value();
861 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
862 }
863 st->print_cr("Launcher Type: %s", _sun_java_launcher);
864 }
865
866 void Arguments::print_jvm_flags_on(outputStream* st) {
867 if (_num_jvm_flags > 0) {
868 for (int i=0; i < _num_jvm_flags; i++) {
869 st->print("%s ", _jvm_flags_array[i]);
870 }
871 st->cr();
872 }
873 }
874
875 void Arguments::print_jvm_args_on(outputStream* st) {
876 if (_num_jvm_args > 0) {
877 for (int i=0; i < _num_jvm_args; i++) {
878 st->print("%s ", _jvm_args_array[i]);
879 }
880 st->cr();
881 }
882 }
883
884 bool Arguments::process_argument(const char* arg,
885 jboolean ignore_unrecognized, Flag::Flags origin) {
886
887 JDK_Version since = JDK_Version();
888
889 if (parse_argument(arg, origin) || ignore_unrecognized) {
890 return true;
891 }
892
893 bool has_plus_minus = (*arg == '+' || *arg == '-');
894 const char* const argname = has_plus_minus ? arg + 1 : arg;
895 if (is_newly_obsolete(arg, &since)) {
896 char version[256];
897 since.to_string(version, sizeof(version));
898 warning("ignoring option %s; support was removed in %s", argname, version);
899 return true;
900 }
901
902 // For locked flags, report a custom error message if available.
903 // Otherwise, report the standard unrecognized VM option.
904
905 size_t arg_len;
906 const char* equal_sign = strchr(argname, '=');
907 if (equal_sign == NULL) {
908 arg_len = strlen(argname);
909 } else {
910 arg_len = equal_sign - argname;
911 }
912
913 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
914 if (found_flag != NULL) {
915 char locked_message_buf[BUFLEN];
916 found_flag->get_locked_message(locked_message_buf, BUFLEN);
917 if (strlen(locked_message_buf) == 0) {
918 if (found_flag->is_bool() && !has_plus_minus) {
919 jio_fprintf(defaultStream::error_stream(),
920 "Missing +/- setting for VM option '%s'\n", argname);
921 } else if (!found_flag->is_bool() && has_plus_minus) {
922 jio_fprintf(defaultStream::error_stream(),
923 "Unexpected +/- setting in VM option '%s'\n", argname);
924 } else {
925 jio_fprintf(defaultStream::error_stream(),
926 "Improperly specified VM option '%s'\n", argname);
927 }
928 } else {
929 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
930 }
931 } else {
932 jio_fprintf(defaultStream::error_stream(),
933 "Unrecognized VM option '%s'\n", argname);
934 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
935 if (fuzzy_matched != NULL) {
936 jio_fprintf(defaultStream::error_stream(),
937 "Did you mean '%s%s%s'?\n",
938 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
939 fuzzy_matched->_name,
940 (fuzzy_matched->is_bool()) ? "" : "=<value>");
941 }
942 }
943
944 // allow for commandline "commenting out" options like -XX:#+Verbose
945 return arg[0] == '#';
946 }
947
948 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
949 FILE* stream = fopen(file_name, "rb");
950 if (stream == NULL) {
951 if (should_exist) {
952 jio_fprintf(defaultStream::error_stream(),
953 "Could not open settings file %s\n", file_name);
954 return false;
955 } else {
956 return true;
957 }
958 }
959
960 char token[1024];
961 int pos = 0;
962
963 bool in_white_space = true;
964 bool in_comment = false;
965 bool in_quote = false;
966 char quote_c = 0;
967 bool result = true;
968
969 int c = getc(stream);
970 while(c != EOF && pos < (int)(sizeof(token)-1)) {
971 if (in_white_space) {
972 if (in_comment) {
973 if (c == '\n') in_comment = false;
974 } else {
975 if (c == '#') in_comment = true;
976 else if (!isspace(c)) {
977 in_white_space = false;
978 token[pos++] = c;
979 }
980 }
981 } else {
982 if (c == '\n' || (!in_quote && isspace(c))) {
983 // token ends at newline, or at unquoted whitespace
984 // this allows a way to include spaces in string-valued options
985 token[pos] = '\0';
986 logOption(token);
987 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
988 build_jvm_flags(token);
989 pos = 0;
990 in_white_space = true;
991 in_quote = false;
992 } else if (!in_quote && (c == '\'' || c == '"')) {
993 in_quote = true;
994 quote_c = c;
995 } else if (in_quote && (c == quote_c)) {
996 in_quote = false;
997 } else {
998 token[pos++] = c;
999 }
1000 }
1001 c = getc(stream);
1002 }
1003 if (pos > 0) {
1004 token[pos] = '\0';
1005 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1006 build_jvm_flags(token);
1007 }
1008 fclose(stream);
1009 return result;
1010 }
1011
1012 //=============================================================================================================
1013 // Parsing of properties (-D)
1014
1015 const char* Arguments::get_property(const char* key) {
1016 return PropertyList_get_value(system_properties(), key);
1017 }
1018
1019 bool Arguments::add_property(const char* prop) {
1020 const char* eq = strchr(prop, '=');
1021 char* key;
1022 // ns must be static--its address may be stored in a SystemProperty object.
1023 const static char ns[1] = {0};
1024 char* value = (char *)ns;
1025
1026 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1027 key = AllocateHeap(key_len + 1, mtInternal);
1028 strncpy(key, prop, key_len);
1029 key[key_len] = '\0';
1030
1031 if (eq != NULL) {
1032 size_t value_len = strlen(prop) - key_len - 1;
1033 value = AllocateHeap(value_len + 1, mtInternal);
1034 strncpy(value, &prop[key_len + 1], value_len + 1);
1035 }
1036
1037 if (strcmp(key, "java.compiler") == 0) {
1038 process_java_compiler_argument(value);
1039 FreeHeap(key);
1040 if (eq != NULL) {
1041 FreeHeap(value);
1042 }
1043 return true;
1044 } else if (strcmp(key, "sun.java.command") == 0) {
1045 _java_command = value;
1046
1047 // Record value in Arguments, but let it get passed to Java.
1048 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1049 strcmp(key, "sun.java.launcher.pid") == 0) {
1050 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1051 // private and are processed in process_sun_java_launcher_properties();
1052 // the sun.java.launcher property is passed on to the java application
1053 FreeHeap(key);
1054 if (eq != NULL) {
1055 FreeHeap(value);
1056 }
1057 return true;
1058 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1059 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1060 // its value without going through the property list or making a Java call.
1061 _java_vendor_url_bug = value;
1062 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1063 PropertyList_unique_add(&_system_properties, key, value, true);
1064 return true;
1065 }
1066 // Create new property and add at the end of the list
1067 PropertyList_unique_add(&_system_properties, key, value);
1068 return true;
1069 }
1070
1071 //===========================================================================================================
1072 // Setting int/mixed/comp mode flags
1073
1074 void Arguments::set_mode_flags(Mode mode) {
1075 // Set up default values for all flags.
1076 // If you add a flag to any of the branches below,
1077 // add a default value for it here.
1078 set_java_compiler(false);
1079 _mode = mode;
1080
1081 // Ensure Agent_OnLoad has the correct initial values.
1082 // This may not be the final mode; mode may change later in onload phase.
1083 PropertyList_unique_add(&_system_properties, "java.vm.info",
1084 (char*)VM_Version::vm_info_string(), false);
1085
1086 UseInterpreter = true;
1087 UseCompiler = true;
1088 UseLoopCounter = true;
1089
1090 // Default values may be platform/compiler dependent -
1091 // use the saved values
1092 ClipInlining = Arguments::_ClipInlining;
1093 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1094 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1095 BackgroundCompilation = Arguments::_BackgroundCompilation;
1096
1097 // Change from defaults based on mode
1098 switch (mode) {
1099 default:
1100 ShouldNotReachHere();
1101 break;
1102 case _int:
1103 UseCompiler = false;
1104 UseLoopCounter = false;
1105 AlwaysCompileLoopMethods = false;
1106 UseOnStackReplacement = false;
1107 break;
1108 case _mixed:
1109 // same as default
1110 break;
1111 case _comp:
1112 UseInterpreter = false;
1113 BackgroundCompilation = false;
1114 ClipInlining = false;
1115 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1116 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1117 // compile a level 4 (C2) and then continue executing it.
1118 if (TieredCompilation) {
1119 Tier3InvokeNotifyFreqLog = 0;
1120 Tier4InvocationThreshold = 0;
1121 }
1122 break;
1123 }
1124 }
1125
1126 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1127 // Conflict: required to use shared spaces (-Xshare:on), but
1128 // incompatible command line options were chosen.
1129
1130 static void no_shared_spaces(const char* message) {
1131 if (RequireSharedSpaces) {
1132 jio_fprintf(defaultStream::error_stream(),
1133 "Class data sharing is inconsistent with other specified options.\n");
1134 vm_exit_during_initialization("Unable to use shared archive.", message);
1135 } else {
1136 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1137 }
1138 }
1139 #endif
1140
1141 // Returns threshold scaled with CompileThresholdScaling
1142 intx Arguments::get_scaled_compile_threshold(intx threshold) {
1143 return (intx)(threshold * CompileThresholdScaling);
1144 }
1145
1146 // Returns freq_log scaled with CompileThresholdScaling
1147 intx Arguments::get_scaled_freq_log(intx freq_log) {
1148 intx scaled_freq = get_scaled_compile_threshold((intx)1 << freq_log);
1149 if (scaled_freq == 0) {
1150 return 0;
1151 } else {
1152 return log2_intptr(scaled_freq);
1153 }
1154 }
1155
1156 void Arguments::set_tiered_flags() {
1157 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1158 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1159 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1160 }
1161 if (CompilationPolicyChoice < 2) {
1162 vm_exit_during_initialization(
1163 "Incompatible compilation policy selected", NULL);
1164 }
1165 // Increase the code cache size - tiered compiles a lot more.
1166 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1167 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1168 }
1169 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1170 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1171 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1172
1173 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1174 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1175 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1176 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1177 }
1178 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1179 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1180 }
1181 // Check consistency of code heap sizes
1182 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1183 jio_fprintf(defaultStream::error_stream(),
1184 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1185 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1186 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1187 vm_exit(1);
1188 }
1189 }
1190 }
1191 if (!UseInterpreter) { // -Xcomp
1192 Tier3InvokeNotifyFreqLog = 0;
1193 Tier4InvocationThreshold = 0;
1194 }
1195 // Scale tiered compilation thresholds
1196 if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) {
1197 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, get_scaled_freq_log(Tier0InvokeNotifyFreqLog));
1198 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, get_scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1199
1200 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, get_scaled_compile_threshold(Tier3InvocationThreshold));
1201 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, get_scaled_compile_threshold(Tier3MinInvocationThreshold));
1202 FLAG_SET_ERGO(intx, Tier3CompileThreshold, get_scaled_compile_threshold(Tier3CompileThreshold));
1203 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, get_scaled_compile_threshold(Tier3BackEdgeThreshold));
1204
1205 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1206 // once these thresholds become supported.
1207
1208 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, get_scaled_freq_log(Tier2InvokeNotifyFreqLog));
1209 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, get_scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1210
1211 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, get_scaled_freq_log(Tier3InvokeNotifyFreqLog));
1212 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, get_scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1213
1214 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, get_scaled_freq_log(Tier23InlineeNotifyFreqLog));
1215
1216 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, get_scaled_compile_threshold(Tier4InvocationThreshold));
1217 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, get_scaled_compile_threshold(Tier4MinInvocationThreshold));
1218 FLAG_SET_ERGO(intx, Tier4CompileThreshold, get_scaled_compile_threshold(Tier4CompileThreshold));
1219 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, get_scaled_compile_threshold(Tier4BackEdgeThreshold));
1220 }
1221 }
1222
1223 /**
1224 * Returns the minimum number of compiler threads needed to run the JVM. The following
1225 * configurations are possible.
1226 *
1227 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1228 * compiler threads is 0.
1229 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1230 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1231 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1232 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1233 * C1 can be used, so the minimum number of compiler threads is 1.
1234 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1235 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1236 * the minimum number of compiler threads is 2.
1237 */
1238 int Arguments::get_min_number_of_compiler_threads() {
1239 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1240 return 0; // case 1
1241 #else
1242 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1243 return 1; // case 2 or case 3
1244 }
1245 return 2; // case 4 (tiered)
1246 #endif
1247 }
1248
1249 #if INCLUDE_ALL_GCS
1250 static void disable_adaptive_size_policy(const char* collector_name) {
1251 if (UseAdaptiveSizePolicy) {
1252 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1253 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1254 collector_name);
1255 }
1256 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1257 }
1258 }
1259
1260 void Arguments::set_parnew_gc_flags() {
1261 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1262 "control point invariant");
1263 assert(UseParNewGC, "Error");
1264
1265 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1266 disable_adaptive_size_policy("UseParNewGC");
1267
1268 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1269 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1270 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1271 } else if (ParallelGCThreads == 0) {
1272 jio_fprintf(defaultStream::error_stream(),
1273 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1274 vm_exit(1);
1275 }
1276
1277 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1278 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1279 // we set them to 1024 and 1024.
1280 // See CR 6362902.
1281 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1282 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1283 }
1284 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1285 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1286 }
1287
1288 // When using compressed oops, we use local overflow stacks,
1289 // rather than using a global overflow list chained through
1290 // the klass word of the object's pre-image.
1291 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1292 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1293 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1294 }
1295 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1296 }
1297 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1298 }
1299
1300 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1301 // sparc/solaris for certain applications, but would gain from
1302 // further optimization and tuning efforts, and would almost
1303 // certainly gain from analysis of platform and environment.
1304 void Arguments::set_cms_and_parnew_gc_flags() {
1305 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1306 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1307
1308 // If we are using CMS, we prefer to UseParNewGC,
1309 // unless explicitly forbidden.
1310 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1311 FLAG_SET_ERGO(bool, UseParNewGC, true);
1312 }
1313
1314 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1315 disable_adaptive_size_policy("UseConcMarkSweepGC");
1316
1317 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1318 // as needed.
1319 if (UseParNewGC) {
1320 set_parnew_gc_flags();
1321 }
1322
1323 size_t max_heap = align_size_down(MaxHeapSize,
1324 CardTableRS::ct_max_alignment_constraint());
1325
1326 // Now make adjustments for CMS
1327 intx tenuring_default = (intx)6;
1328 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1329
1330 // Preferred young gen size for "short" pauses:
1331 // upper bound depends on # of threads and NewRatio.
1332 const uintx parallel_gc_threads =
1333 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1334 const size_t preferred_max_new_size_unaligned =
1335 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1336 size_t preferred_max_new_size =
1337 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1338
1339 // Unless explicitly requested otherwise, size young gen
1340 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1341
1342 // If either MaxNewSize or NewRatio is set on the command line,
1343 // assume the user is trying to set the size of the young gen.
1344 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1345
1346 // Set MaxNewSize to our calculated preferred_max_new_size unless
1347 // NewSize was set on the command line and it is larger than
1348 // preferred_max_new_size.
1349 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1350 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1351 } else {
1352 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1353 }
1354 if (PrintGCDetails && Verbose) {
1355 // Too early to use gclog_or_tty
1356 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1357 }
1358
1359 // Code along this path potentially sets NewSize and OldSize
1360 if (PrintGCDetails && Verbose) {
1361 // Too early to use gclog_or_tty
1362 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1363 " initial_heap_size: " SIZE_FORMAT
1364 " max_heap: " SIZE_FORMAT,
1365 min_heap_size(), InitialHeapSize, max_heap);
1366 }
1367 size_t min_new = preferred_max_new_size;
1368 if (FLAG_IS_CMDLINE(NewSize)) {
1369 min_new = NewSize;
1370 }
1371 if (max_heap > min_new && min_heap_size() > min_new) {
1372 // Unless explicitly requested otherwise, make young gen
1373 // at least min_new, and at most preferred_max_new_size.
1374 if (FLAG_IS_DEFAULT(NewSize)) {
1375 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1376 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1377 if (PrintGCDetails && Verbose) {
1378 // Too early to use gclog_or_tty
1379 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1380 }
1381 }
1382 // Unless explicitly requested otherwise, size old gen
1383 // so it's NewRatio x of NewSize.
1384 if (FLAG_IS_DEFAULT(OldSize)) {
1385 if (max_heap > NewSize) {
1386 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1387 if (PrintGCDetails && Verbose) {
1388 // Too early to use gclog_or_tty
1389 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1390 }
1391 }
1392 }
1393 }
1394 }
1395 // Unless explicitly requested otherwise, definitely
1396 // promote all objects surviving "tenuring_default" scavenges.
1397 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1398 FLAG_IS_DEFAULT(SurvivorRatio)) {
1399 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1400 }
1401 // If we decided above (or user explicitly requested)
1402 // `promote all' (via MaxTenuringThreshold := 0),
1403 // prefer minuscule survivor spaces so as not to waste
1404 // space for (non-existent) survivors
1405 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1406 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1407 }
1408 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1409 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1410 // This is done in order to make ParNew+CMS configuration to work
1411 // with YoungPLABSize and OldPLABSize options.
1412 // See CR 6362902.
1413 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1414 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1415 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1416 // is. In this situation let CMSParPromoteBlocksToClaim follow
1417 // the value (either from the command line or ergonomics) of
1418 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1419 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1420 } else {
1421 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1422 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1423 // we'll let it to take precedence.
1424 jio_fprintf(defaultStream::error_stream(),
1425 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1426 " options are specified for the CMS collector."
1427 " CMSParPromoteBlocksToClaim will take precedence.\n");
1428 }
1429 }
1430 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1431 // OldPLAB sizing manually turned off: Use a larger default setting,
1432 // unless it was manually specified. This is because a too-low value
1433 // will slow down scavenges.
1434 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1435 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1436 }
1437 }
1438 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1439 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1440 // If either of the static initialization defaults have changed, note this
1441 // modification.
1442 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1443 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1444 }
1445 if (PrintGCDetails && Verbose) {
1446 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1447 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1448 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1449 }
1450 }
1451 #endif // INCLUDE_ALL_GCS
1452
1453 void set_object_alignment() {
1454 // Object alignment.
1455 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1456 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1457 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1458 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1459 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1460 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1461
1462 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1463 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1464
1465 // Oop encoding heap max
1466 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1467
1468 #if INCLUDE_ALL_GCS
1469 // Set CMS global values
1470 CompactibleFreeListSpace::set_cms_values();
1471 #endif // INCLUDE_ALL_GCS
1472 }
1473
1474 bool verify_object_alignment() {
1475 // Object alignment.
1476 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1477 jio_fprintf(defaultStream::error_stream(),
1478 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1479 (int)ObjectAlignmentInBytes);
1480 return false;
1481 }
1482 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1483 jio_fprintf(defaultStream::error_stream(),
1484 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1485 (int)ObjectAlignmentInBytes, BytesPerLong);
1486 return false;
1487 }
1488 // It does not make sense to have big object alignment
1489 // since a space lost due to alignment will be greater
1490 // then a saved space from compressed oops.
1491 if ((int)ObjectAlignmentInBytes > 256) {
1492 jio_fprintf(defaultStream::error_stream(),
1493 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1494 (int)ObjectAlignmentInBytes);
1495 return false;
1496 }
1497 // In case page size is very small.
1498 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1499 jio_fprintf(defaultStream::error_stream(),
1500 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1501 (int)ObjectAlignmentInBytes, os::vm_page_size());
1502 return false;
1503 }
1504 if(SurvivorAlignmentInBytes == 0) {
1505 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1506 } else {
1507 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1508 jio_fprintf(defaultStream::error_stream(),
1509 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1510 (int)SurvivorAlignmentInBytes);
1511 return false;
1512 }
1513 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1514 jio_fprintf(defaultStream::error_stream(),
1515 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1516 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1517 return false;
1518 }
1519 }
1520 return true;
1521 }
1522
1523 size_t Arguments::max_heap_for_compressed_oops() {
1524 // Avoid sign flip.
1525 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1526 // We need to fit both the NULL page and the heap into the memory budget, while
1527 // keeping alignment constraints of the heap. To guarantee the latter, as the
1528 // NULL page is located before the heap, we pad the NULL page to the conservative
1529 // maximum alignment that the GC may ever impose upon the heap.
1530 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1531 _conservative_max_heap_alignment);
1532
1533 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1534 NOT_LP64(ShouldNotReachHere(); return 0);
1535 }
1536
1537 bool Arguments::should_auto_select_low_pause_collector() {
1538 if (UseAutoGCSelectPolicy &&
1539 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1540 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1541 if (PrintGCDetails) {
1542 // Cannot use gclog_or_tty yet.
1543 tty->print_cr("Automatic selection of the low pause collector"
1544 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1545 }
1546 return true;
1547 }
1548 return false;
1549 }
1550
1551 void Arguments::set_use_compressed_oops() {
1552 #ifndef ZERO
1553 #ifdef _LP64
1554 // MaxHeapSize is not set up properly at this point, but
1555 // the only value that can override MaxHeapSize if we are
1556 // to use UseCompressedOops is InitialHeapSize.
1557 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1558
1559 if (max_heap_size <= max_heap_for_compressed_oops()) {
1560 #if !defined(COMPILER1) || defined(TIERED)
1561 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1562 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1563 }
1564 #endif
1565 #ifdef _WIN64
1566 if (UseLargePages && UseCompressedOops) {
1567 // Cannot allocate guard pages for implicit checks in indexed addressing
1568 // mode, when large pages are specified on windows.
1569 // This flag could be switched ON if narrow oop base address is set to 0,
1570 // see code in Universe::initialize_heap().
1571 Universe::set_narrow_oop_use_implicit_null_checks(false);
1572 }
1573 #endif // _WIN64
1574 } else {
1575 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1576 warning("Max heap size too large for Compressed Oops");
1577 FLAG_SET_DEFAULT(UseCompressedOops, false);
1578 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1579 }
1580 }
1581 #endif // _LP64
1582 #endif // ZERO
1583 }
1584
1585
1586 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1587 // set_use_compressed_oops().
1588 void Arguments::set_use_compressed_klass_ptrs() {
1589 #ifndef ZERO
1590 #ifdef _LP64
1591 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1592 if (!UseCompressedOops) {
1593 if (UseCompressedClassPointers) {
1594 warning("UseCompressedClassPointers requires UseCompressedOops");
1595 }
1596 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1597 } else {
1598 // Turn on UseCompressedClassPointers too
1599 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1600 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1601 }
1602 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1603 if (UseCompressedClassPointers) {
1604 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1605 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1606 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1607 }
1608 }
1609 }
1610 #endif // _LP64
1611 #endif // !ZERO
1612 }
1613
1614 void Arguments::set_conservative_max_heap_alignment() {
1615 // The conservative maximum required alignment for the heap is the maximum of
1616 // the alignments imposed by several sources: any requirements from the heap
1617 // itself, the collector policy and the maximum page size we may run the VM
1618 // with.
1619 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1620 #if INCLUDE_ALL_GCS
1621 if (UseParallelGC) {
1622 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1623 } else if (UseG1GC) {
1624 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1625 }
1626 #endif // INCLUDE_ALL_GCS
1627 _conservative_max_heap_alignment = MAX4(heap_alignment,
1628 (size_t)os::vm_allocation_granularity(),
1629 os::max_page_size(),
1630 CollectorPolicy::compute_heap_alignment());
1631 }
1632
1633 void Arguments::select_gc_ergonomically() {
1634 if (os::is_server_class_machine()) {
1635 if (should_auto_select_low_pause_collector()) {
1636 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1637 } else {
1638 FLAG_SET_ERGO(bool, UseParallelGC, true);
1639 }
1640 }
1641 }
1642
1643 void Arguments::select_gc() {
1644 if (!gc_selected()) {
1645 ArgumentsExt::select_gc_ergonomically();
1646 }
1647 }
1648
1649 void Arguments::set_ergonomics_flags() {
1650 select_gc();
1651
1652 #ifdef COMPILER2
1653 // Shared spaces work fine with other GCs but causes bytecode rewriting
1654 // to be disabled, which hurts interpreter performance and decreases
1655 // server performance. When -server is specified, keep the default off
1656 // unless it is asked for. Future work: either add bytecode rewriting
1657 // at link time, or rewrite bytecodes in non-shared methods.
1658 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1659 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1660 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1661 }
1662 #endif
1663
1664 set_conservative_max_heap_alignment();
1665
1666 #ifndef ZERO
1667 #ifdef _LP64
1668 set_use_compressed_oops();
1669
1670 // set_use_compressed_klass_ptrs() must be called after calling
1671 // set_use_compressed_oops().
1672 set_use_compressed_klass_ptrs();
1673
1674 // Also checks that certain machines are slower with compressed oops
1675 // in vm_version initialization code.
1676 #endif // _LP64
1677 #endif // !ZERO
1678 }
1679
1680 void Arguments::set_parallel_gc_flags() {
1681 assert(UseParallelGC || UseParallelOldGC, "Error");
1682 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1683 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1684 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1685 }
1686 FLAG_SET_DEFAULT(UseParallelGC, true);
1687
1688 // If no heap maximum was requested explicitly, use some reasonable fraction
1689 // of the physical memory, up to a maximum of 1GB.
1690 FLAG_SET_DEFAULT(ParallelGCThreads,
1691 Abstract_VM_Version::parallel_worker_threads());
1692 if (ParallelGCThreads == 0) {
1693 jio_fprintf(defaultStream::error_stream(),
1694 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1695 vm_exit(1);
1696 }
1697
1698 if (UseAdaptiveSizePolicy) {
1699 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1700 // unless the user actually sets these flags.
1701 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1702 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1703 _min_heap_free_ratio = MinHeapFreeRatio;
1704 }
1705 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1706 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1707 _max_heap_free_ratio = MaxHeapFreeRatio;
1708 }
1709 }
1710
1711 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1712 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1713 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1714 // See CR 6362902 for details.
1715 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1716 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1717 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1718 }
1719 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1720 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1721 }
1722 }
1723
1724 if (UseParallelOldGC) {
1725 // Par compact uses lower default values since they are treated as
1726 // minimums. These are different defaults because of the different
1727 // interpretation and are not ergonomically set.
1728 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1729 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1730 }
1731 }
1732 }
1733
1734 void Arguments::set_g1_gc_flags() {
1735 assert(UseG1GC, "Error");
1736 #ifdef COMPILER1
1737 FastTLABRefill = false;
1738 #endif
1739 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1740 if (ParallelGCThreads == 0) {
1741 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1742 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1743 }
1744
1745 #if INCLUDE_ALL_GCS
1746 if (G1ConcRefinementThreads == 0) {
1747 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1748 }
1749 #endif
1750
1751 // MarkStackSize will be set (if it hasn't been set by the user)
1752 // when concurrent marking is initialized.
1753 // Its value will be based upon the number of parallel marking threads.
1754 // But we do set the maximum mark stack size here.
1755 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1756 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1757 }
1758
1759 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1760 // In G1, we want the default GC overhead goal to be higher than
1761 // say in PS. So we set it here to 10%. Otherwise the heap might
1762 // be expanded more aggressively than we would like it to. In
1763 // fact, even 10% seems to not be high enough in some cases
1764 // (especially small GC stress tests that the main thing they do
1765 // is allocation). We might consider increase it further.
1766 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1767 }
1768
1769 if (PrintGCDetails && Verbose) {
1770 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1771 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1772 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1773 }
1774 }
1775
1776 #if !INCLUDE_ALL_GCS
1777 #ifdef ASSERT
1778 static bool verify_serial_gc_flags() {
1779 return (UseSerialGC &&
1780 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1781 UseParallelGC || UseParallelOldGC));
1782 }
1783 #endif // ASSERT
1784 #endif // INCLUDE_ALL_GCS
1785
1786 void Arguments::set_gc_specific_flags() {
1787 #if INCLUDE_ALL_GCS
1788 // Set per-collector flags
1789 if (UseParallelGC || UseParallelOldGC) {
1790 set_parallel_gc_flags();
1791 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
1792 set_cms_and_parnew_gc_flags();
1793 } else if (UseParNewGC) { // Skipped if CMS is set above
1794 set_parnew_gc_flags();
1795 } else if (UseG1GC) {
1796 set_g1_gc_flags();
1797 }
1798 check_deprecated_gcs();
1799 check_deprecated_gc_flags();
1800 if (AssumeMP && !UseSerialGC) {
1801 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1802 warning("If the number of processors is expected to increase from one, then"
1803 " you should configure the number of parallel GC threads appropriately"
1804 " using -XX:ParallelGCThreads=N");
1805 }
1806 }
1807 if (MinHeapFreeRatio == 100) {
1808 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1809 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1810 }
1811 #else // INCLUDE_ALL_GCS
1812 assert(verify_serial_gc_flags(), "SerialGC unset");
1813 #endif // INCLUDE_ALL_GCS
1814 }
1815
1816 julong Arguments::limit_by_allocatable_memory(julong limit) {
1817 julong max_allocatable;
1818 julong result = limit;
1819 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1820 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1821 }
1822 return result;
1823 }
1824
1825 // Use static initialization to get the default before parsing
1826 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1827
1828 void Arguments::set_heap_size() {
1829 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1830 // Deprecated flag
1831 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1832 }
1833
1834 const julong phys_mem =
1835 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1836 : (julong)MaxRAM;
1837
1838 // If the maximum heap size has not been set with -Xmx,
1839 // then set it as fraction of the size of physical memory,
1840 // respecting the maximum and minimum sizes of the heap.
1841 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1842 julong reasonable_max = phys_mem / MaxRAMFraction;
1843
1844 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1845 // Small physical memory, so use a minimum fraction of it for the heap
1846 reasonable_max = phys_mem / MinRAMFraction;
1847 } else {
1848 // Not-small physical memory, so require a heap at least
1849 // as large as MaxHeapSize
1850 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1851 }
1852 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1853 // Limit the heap size to ErgoHeapSizeLimit
1854 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1855 }
1856 if (UseCompressedOops) {
1857 // Limit the heap size to the maximum possible when using compressed oops
1858 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1859
1860 // HeapBaseMinAddress can be greater than default but not less than.
1861 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1862 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1863 // matches compressed oops printing flags
1864 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1865 jio_fprintf(defaultStream::error_stream(),
1866 "HeapBaseMinAddress must be at least " UINTX_FORMAT
1867 " (" UINTX_FORMAT "G) which is greater than value given "
1868 UINTX_FORMAT "\n",
1869 DefaultHeapBaseMinAddress,
1870 DefaultHeapBaseMinAddress/G,
1871 HeapBaseMinAddress);
1872 }
1873 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1874 }
1875 }
1876
1877 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1878 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1879 // but it should be not less than default MaxHeapSize.
1880 max_coop_heap -= HeapBaseMinAddress;
1881 }
1882 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1883 }
1884 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1885
1886 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1887 // An initial heap size was specified on the command line,
1888 // so be sure that the maximum size is consistent. Done
1889 // after call to limit_by_allocatable_memory because that
1890 // method might reduce the allocation size.
1891 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1892 }
1893
1894 if (PrintGCDetails && Verbose) {
1895 // Cannot use gclog_or_tty yet.
1896 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1897 }
1898 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1899 }
1900
1901 // If the minimum or initial heap_size have not been set or requested to be set
1902 // ergonomically, set them accordingly.
1903 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1904 julong reasonable_minimum = (julong)(OldSize + NewSize);
1905
1906 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1907
1908 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1909
1910 if (InitialHeapSize == 0) {
1911 julong reasonable_initial = phys_mem / InitialRAMFraction;
1912
1913 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1914 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1915
1916 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1917
1918 if (PrintGCDetails && Verbose) {
1919 // Cannot use gclog_or_tty yet.
1920 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1921 }
1922 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1923 }
1924 // If the minimum heap size has not been set (via -Xms),
1925 // synchronize with InitialHeapSize to avoid errors with the default value.
1926 if (min_heap_size() == 0) {
1927 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1928 if (PrintGCDetails && Verbose) {
1929 // Cannot use gclog_or_tty yet.
1930 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1931 }
1932 }
1933 }
1934 }
1935
1936 // This must be called after ergonomics because we want bytecode rewriting
1937 // if the server compiler is used, or if UseSharedSpaces is disabled.
1938 void Arguments::set_bytecode_flags() {
1939 // Better not attempt to store into a read-only space.
1940 if (UseSharedSpaces) {
1941 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1942 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1943 }
1944
1945 if (!RewriteBytecodes) {
1946 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1947 }
1948 }
1949
1950 // Aggressive optimization flags -XX:+AggressiveOpts
1951 void Arguments::set_aggressive_opts_flags() {
1952 #ifdef COMPILER2
1953 if (AggressiveUnboxing) {
1954 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1955 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1956 } else if (!EliminateAutoBox) {
1957 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1958 AggressiveUnboxing = false;
1959 }
1960 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1961 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1962 } else if (!DoEscapeAnalysis) {
1963 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1964 AggressiveUnboxing = false;
1965 }
1966 }
1967 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1968 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1969 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1970 }
1971 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1972 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1973 }
1974
1975 // Feed the cache size setting into the JDK
1976 char buffer[1024];
1977 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1978 add_property(buffer);
1979 }
1980 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1981 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1982 }
1983 #endif
1984
1985 if (AggressiveOpts) {
1986 // Sample flag setting code
1987 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1988 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1989 // }
1990 }
1991 }
1992
1993 //===========================================================================================================
1994 // Parsing of java.compiler property
1995
1996 void Arguments::process_java_compiler_argument(char* arg) {
1997 // For backwards compatibility, Djava.compiler=NONE or ""
1998 // causes us to switch to -Xint mode UNLESS -Xdebug
1999 // is also specified.
2000 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2001 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2002 }
2003 }
2004
2005 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2006 _sun_java_launcher = os::strdup_check_oom(launcher);
2007 }
2008
2009 bool Arguments::created_by_java_launcher() {
2010 assert(_sun_java_launcher != NULL, "property must have value");
2011 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2012 }
2013
2014 bool Arguments::sun_java_launcher_is_altjvm() {
2015 return _sun_java_launcher_is_altjvm;
2016 }
2017
2018 //===========================================================================================================
2019 // Parsing of main arguments
2020
2021 bool Arguments::verify_interval(uintx val, uintx min,
2022 uintx max, const char* name) {
2023 // Returns true iff value is in the inclusive interval [min..max]
2024 // false, otherwise.
2025 if (val >= min && val <= max) {
2026 return true;
2027 }
2028 jio_fprintf(defaultStream::error_stream(),
2029 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
2030 " and " UINTX_FORMAT "\n",
2031 name, val, min, max);
2032 return false;
2033 }
2034
2035 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
2036 // Returns true if given value is at least specified min threshold
2037 // false, otherwise.
2038 if (val >= min ) {
2039 return true;
2040 }
2041 jio_fprintf(defaultStream::error_stream(),
2042 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
2043 name, val, min);
2044 return false;
2045 }
2046
2047 bool Arguments::verify_percentage(uintx value, const char* name) {
2048 if (is_percentage(value)) {
2049 return true;
2050 }
2051 jio_fprintf(defaultStream::error_stream(),
2052 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2053 name, value);
2054 return false;
2055 }
2056
2057 // check if do gclog rotation
2058 // +UseGCLogFileRotation is a must,
2059 // no gc log rotation when log file not supplied or
2060 // NumberOfGCLogFiles is 0
2061 void check_gclog_consistency() {
2062 if (UseGCLogFileRotation) {
2063 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2064 jio_fprintf(defaultStream::output_stream(),
2065 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2066 "where num_of_file > 0\n"
2067 "GC log rotation is turned off\n");
2068 UseGCLogFileRotation = false;
2069 }
2070 }
2071
2072 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2073 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2074 jio_fprintf(defaultStream::output_stream(),
2075 "GCLogFileSize changed to minimum 8K\n");
2076 }
2077 }
2078
2079 // This function is called for -Xloggc:<filename>, it can be used
2080 // to check if a given file name(or string) conforms to the following
2081 // specification:
2082 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2083 // %p and %t only allowed once. We only limit usage of filename not path
2084 bool is_filename_valid(const char *file_name) {
2085 const char* p = file_name;
2086 char file_sep = os::file_separator()[0];
2087 const char* cp;
2088 // skip prefix path
2089 for (cp = file_name; *cp != '\0'; cp++) {
2090 if (*cp == '/' || *cp == file_sep) {
2091 p = cp + 1;
2092 }
2093 }
2094
2095 int count_p = 0;
2096 int count_t = 0;
2097 while (*p != '\0') {
2098 if ((*p >= '0' && *p <= '9') ||
2099 (*p >= 'A' && *p <= 'Z') ||
2100 (*p >= 'a' && *p <= 'z') ||
2101 *p == '-' ||
2102 *p == '_' ||
2103 *p == '.') {
2104 p++;
2105 continue;
2106 }
2107 if (*p == '%') {
2108 if(*(p + 1) == 'p') {
2109 p += 2;
2110 count_p ++;
2111 continue;
2112 }
2113 if (*(p + 1) == 't') {
2114 p += 2;
2115 count_t ++;
2116 continue;
2117 }
2118 }
2119 return false;
2120 }
2121 return count_p < 2 && count_t < 2;
2122 }
2123
2124 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2125 if (!is_percentage(min_heap_free_ratio)) {
2126 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2127 return false;
2128 }
2129 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2130 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2131 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2132 MaxHeapFreeRatio);
2133 return false;
2134 }
2135 // This does not set the flag itself, but stores the value in a safe place for later usage.
2136 _min_heap_free_ratio = min_heap_free_ratio;
2137 return true;
2138 }
2139
2140 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2141 if (!is_percentage(max_heap_free_ratio)) {
2142 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2143 return false;
2144 }
2145 if (max_heap_free_ratio < MinHeapFreeRatio) {
2146 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2147 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2148 MinHeapFreeRatio);
2149 return false;
2150 }
2151 // This does not set the flag itself, but stores the value in a safe place for later usage.
2152 _max_heap_free_ratio = max_heap_free_ratio;
2153 return true;
2154 }
2155
2156 // Check consistency of GC selection
2157 bool Arguments::check_gc_consistency_user() {
2158 check_gclog_consistency();
2159 bool status = true;
2160 // Ensure that the user has not selected conflicting sets
2161 // of collectors. [Note: this check is merely a user convenience;
2162 // collectors over-ride each other so that only a non-conflicting
2163 // set is selected; however what the user gets is not what they
2164 // may have expected from the combination they asked for. It's
2165 // better to reduce user confusion by not allowing them to
2166 // select conflicting combinations.
2167 uint i = 0;
2168 if (UseSerialGC) i++;
2169 if (UseConcMarkSweepGC || UseParNewGC) i++;
2170 if (UseParallelGC || UseParallelOldGC) i++;
2171 if (UseG1GC) i++;
2172 if (i > 1) {
2173 jio_fprintf(defaultStream::error_stream(),
2174 "Conflicting collector combinations in option list; "
2175 "please refer to the release notes for the combinations "
2176 "allowed\n");
2177 status = false;
2178 }
2179 return status;
2180 }
2181
2182 void Arguments::check_deprecated_gcs() {
2183 if (UseConcMarkSweepGC && !UseParNewGC) {
2184 warning("Using the DefNew young collector with the CMS collector is deprecated "
2185 "and will likely be removed in a future release");
2186 }
2187
2188 if (UseParNewGC && !UseConcMarkSweepGC) {
2189 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2190 // set up UseSerialGC properly, so that can't be used in the check here.
2191 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2192 "and will likely be removed in a future release");
2193 }
2194
2195 if (CMSIncrementalMode) {
2196 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2197 }
2198 }
2199
2200 void Arguments::check_deprecated_gc_flags() {
2201 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2202 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2203 "and will likely be removed in future release");
2204 }
2205 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2206 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2207 "Use MaxRAMFraction instead.");
2208 }
2209 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2210 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2211 }
2212 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2213 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2214 }
2215 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2216 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2217 }
2218 }
2219
2220 // Check stack pages settings
2221 bool Arguments::check_stack_pages()
2222 {
2223 bool status = true;
2224 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2225 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2226 // greater stack shadow pages can't generate instruction to bang stack
2227 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2228 return status;
2229 }
2230
2231 // Check the consistency of vm_init_args
2232 bool Arguments::check_vm_args_consistency() {
2233 // Method for adding checks for flag consistency.
2234 // The intent is to warn the user of all possible conflicts,
2235 // before returning an error.
2236 // Note: Needs platform-dependent factoring.
2237 bool status = true;
2238
2239 if (TLABRefillWasteFraction == 0) {
2240 jio_fprintf(defaultStream::error_stream(),
2241 "TLABRefillWasteFraction should be a denominator, "
2242 "not " SIZE_FORMAT "\n",
2243 TLABRefillWasteFraction);
2244 status = false;
2245 }
2246
2247 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2248 "AdaptiveSizePolicyWeight");
2249 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2250
2251 // Divide by bucket size to prevent a large size from causing rollover when
2252 // calculating amount of memory needed to be allocated for the String table.
2253 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2254 (max_uintx / StringTable::bucket_size()), "StringTable size");
2255
2256 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2257 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2258
2259 {
2260 // Using "else if" below to avoid printing two error messages if min > max.
2261 // This will also prevent us from reporting both min>100 and max>100 at the
2262 // same time, but that is less annoying than printing two identical errors IMHO.
2263 FormatBuffer<80> err_msg("%s","");
2264 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2265 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2266 status = false;
2267 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2268 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2269 status = false;
2270 }
2271 }
2272
2273 // Min/MaxMetaspaceFreeRatio
2274 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2275 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2276
2277 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2278 jio_fprintf(defaultStream::error_stream(),
2279 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2280 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2281 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2282 MinMetaspaceFreeRatio,
2283 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2284 MaxMetaspaceFreeRatio);
2285 status = false;
2286 }
2287
2288 // Trying to keep 100% free is not practical
2289 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2290
2291 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2292 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2293 }
2294
2295 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2296 // Settings to encourage splitting.
2297 if (!FLAG_IS_CMDLINE(NewRatio)) {
2298 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2299 }
2300 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2301 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2302 }
2303 }
2304
2305 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2306 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2307 }
2308
2309 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2310 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2311 if (GCTimeLimit == 100) {
2312 // Turn off gc-overhead-limit-exceeded checks
2313 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2314 }
2315
2316 status = status && ArgumentsExt::check_gc_consistency_user();
2317 status = status && check_stack_pages();
2318
2319 if (CMSIncrementalMode) {
2320 if (!UseConcMarkSweepGC) {
2321 jio_fprintf(defaultStream::error_stream(),
2322 "error: invalid argument combination.\n"
2323 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2324 "selected in order\nto use CMSIncrementalMode.\n");
2325 status = false;
2326 } else {
2327 status = status && verify_percentage(CMSIncrementalDutyCycle,
2328 "CMSIncrementalDutyCycle");
2329 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2330 "CMSIncrementalDutyCycleMin");
2331 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2332 "CMSIncrementalSafetyFactor");
2333 status = status && verify_percentage(CMSIncrementalOffset,
2334 "CMSIncrementalOffset");
2335 status = status && verify_percentage(CMSExpAvgFactor,
2336 "CMSExpAvgFactor");
2337 // If it was not set on the command line, set
2338 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2339 if (CMSInitiatingOccupancyFraction < 0) {
2340 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2341 }
2342 }
2343 }
2344
2345 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2346 // insists that we hold the requisite locks so that the iteration is
2347 // MT-safe. For the verification at start-up and shut-down, we don't
2348 // yet have a good way of acquiring and releasing these locks,
2349 // which are not visible at the CollectedHeap level. We want to
2350 // be able to acquire these locks and then do the iteration rather
2351 // than just disable the lock verification. This will be fixed under
2352 // bug 4788986.
2353 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2354 if (VerifyDuringStartup) {
2355 warning("Heap verification at start-up disabled "
2356 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2357 VerifyDuringStartup = false; // Disable verification at start-up
2358 }
2359
2360 if (VerifyBeforeExit) {
2361 warning("Heap verification at shutdown disabled "
2362 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2363 VerifyBeforeExit = false; // Disable verification at shutdown
2364 }
2365 }
2366
2367 // Note: only executed in non-PRODUCT mode
2368 if (!UseAsyncConcMarkSweepGC &&
2369 (ExplicitGCInvokesConcurrent ||
2370 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2371 jio_fprintf(defaultStream::error_stream(),
2372 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2373 " with -UseAsyncConcMarkSweepGC");
2374 status = false;
2375 }
2376
2377 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2378
2379 #if INCLUDE_ALL_GCS
2380 if (UseG1GC) {
2381 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2382 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2383 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2384
2385 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2386 "InitiatingHeapOccupancyPercent");
2387 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2388 "G1RefProcDrainInterval");
2389 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2390 "G1ConcMarkStepDurationMillis");
2391 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2392 "G1ConcRSHotCardLimit");
2393 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2394 "G1ConcRSLogCacheSize");
2395 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2396 "StringDeduplicationAgeThreshold");
2397 }
2398 if (UseConcMarkSweepGC) {
2399 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2400 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2401 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2402 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2403
2404 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2405
2406 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2407 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2408 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2409
2410 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2411
2412 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2413 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2414
2415 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2416 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2417 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2418
2419 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2420
2421 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2422
2423 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2424 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2425 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2426 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2427 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2428 }
2429
2430 if (UseParallelGC || UseParallelOldGC) {
2431 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2432 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2433
2434 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2435 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2436
2437 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2438 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2439
2440 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2441
2442 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2443 }
2444 #endif // INCLUDE_ALL_GCS
2445
2446 status = status && verify_interval(RefDiscoveryPolicy,
2447 ReferenceProcessor::DiscoveryPolicyMin,
2448 ReferenceProcessor::DiscoveryPolicyMax,
2449 "RefDiscoveryPolicy");
2450
2451 // Limit the lower bound of this flag to 1 as it is used in a division
2452 // expression.
2453 status = status && verify_interval(TLABWasteTargetPercent,
2454 1, 100, "TLABWasteTargetPercent");
2455
2456 status = status && verify_object_alignment();
2457
2458 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2459 "CompressedClassSpaceSize");
2460
2461 status = status && verify_interval(MarkStackSizeMax,
2462 1, (max_jint - 1), "MarkStackSizeMax");
2463 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2464
2465 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2466
2467 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2468
2469 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2470
2471 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2472 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2473
2474 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2475
2476 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2477 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2478 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2479 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2480
2481 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2482 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2483
2484 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2485 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2486 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2487
2488 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2489 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2490
2491 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2492 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2493 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2494 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2495
2496 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2497 #ifdef COMPILER1
2498 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2499 #endif
2500
2501 if (PrintNMTStatistics) {
2502 #if INCLUDE_NMT
2503 if (MemTracker::tracking_level() == NMT_off) {
2504 #endif // INCLUDE_NMT
2505 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2506 PrintNMTStatistics = false;
2507 #if INCLUDE_NMT
2508 }
2509 #endif
2510 }
2511
2512 // Need to limit the extent of the padding to reasonable size.
2513 // 8K is well beyond the reasonable HW cache line size, even with the
2514 // aggressive prefetching, while still leaving the room for segregating
2515 // among the distinct pages.
2516 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2517 jio_fprintf(defaultStream::error_stream(),
2518 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2519 ContendedPaddingWidth, 0, 8192);
2520 status = false;
2521 }
2522
2523 // Need to enforce the padding not to break the existing field alignments.
2524 // It is sufficient to check against the largest type size.
2525 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2526 jio_fprintf(defaultStream::error_stream(),
2527 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2528 ContendedPaddingWidth, BytesPerLong);
2529 status = false;
2530 }
2531
2532 // Check lower bounds of the code cache
2533 // Template Interpreter code is approximately 3X larger in debug builds.
2534 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2535 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2536 jio_fprintf(defaultStream::error_stream(),
2537 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2538 os::vm_page_size()/K);
2539 status = false;
2540 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2541 jio_fprintf(defaultStream::error_stream(),
2542 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2543 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2544 status = false;
2545 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2546 jio_fprintf(defaultStream::error_stream(),
2547 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2548 min_code_cache_size/K);
2549 status = false;
2550 } else if (ReservedCodeCacheSize > 2*G) {
2551 // Code cache size larger than MAXINT is not supported.
2552 jio_fprintf(defaultStream::error_stream(),
2553 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2554 (2*G)/M);
2555 status = false;
2556 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2557 jio_fprintf(defaultStream::error_stream(),
2558 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2559 min_code_cache_size/K);
2560 status = false;
2561 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2562 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2563 jio_fprintf(defaultStream::error_stream(),
2564 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2565 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2566 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2567 status = false;
2568 }
2569
2570 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2571 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2572 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2573 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt");
2574
2575
2576 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2577 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2578 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2579 // Check the minimum number of compiler threads
2580 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2581
2582 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2583 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2584 }
2585
2586 return status;
2587 }
2588
2589 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2590 const char* option_type) {
2591 if (ignore) return false;
2592
2593 const char* spacer = " ";
2594 if (option_type == NULL) {
2595 option_type = ++spacer; // Set both to the empty string.
2596 }
2597
2598 if (os::obsolete_option(option)) {
2599 jio_fprintf(defaultStream::error_stream(),
2600 "Obsolete %s%soption: %s\n", option_type, spacer,
2601 option->optionString);
2602 return false;
2603 } else {
2604 jio_fprintf(defaultStream::error_stream(),
2605 "Unrecognized %s%soption: %s\n", option_type, spacer,
2606 option->optionString);
2607 return true;
2608 }
2609 }
2610
2611 static const char* user_assertion_options[] = {
2612 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2613 };
2614
2615 static const char* system_assertion_options[] = {
2616 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2617 };
2618
2619 // Return true if any of the strings in null-terminated array 'names' matches.
2620 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2621 // the option must match exactly.
2622 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2623 bool tail_allowed) {
2624 for (/* empty */; *names != NULL; ++names) {
2625 if (match_option(option, *names, tail)) {
2626 if (**tail == '\0' || tail_allowed && **tail == ':') {
2627 return true;
2628 }
2629 }
2630 }
2631 return false;
2632 }
2633
2634 bool Arguments::parse_uintx(const char* value,
2635 uintx* uintx_arg,
2636 uintx min_size) {
2637
2638 // Check the sign first since atomull() parses only unsigned values.
2639 bool value_is_positive = !(*value == '-');
2640
2641 if (value_is_positive) {
2642 julong n;
2643 bool good_return = atomull(value, &n);
2644 if (good_return) {
2645 bool above_minimum = n >= min_size;
2646 bool value_is_too_large = n > max_uintx;
2647
2648 if (above_minimum && !value_is_too_large) {
2649 *uintx_arg = n;
2650 return true;
2651 }
2652 }
2653 }
2654 return false;
2655 }
2656
2657 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2658 julong* long_arg,
2659 julong min_size) {
2660 if (!atomull(s, long_arg)) return arg_unreadable;
2661 return check_memory_size(*long_arg, min_size);
2662 }
2663
2664 // Parse JavaVMInitArgs structure
2665
2666 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2667 // For components of the system classpath.
2668 SysClassPath scp(Arguments::get_sysclasspath());
2669 bool scp_assembly_required = false;
2670
2671 // Save default settings for some mode flags
2672 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2673 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2674 Arguments::_ClipInlining = ClipInlining;
2675 Arguments::_BackgroundCompilation = BackgroundCompilation;
2676
2677 // Setup flags for mixed which is the default
2678 set_mode_flags(_mixed);
2679
2680 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2681 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2682 if (result != JNI_OK) {
2683 return result;
2684 }
2685
2686 // Parse JavaVMInitArgs structure passed in
2687 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2688 if (result != JNI_OK) {
2689 return result;
2690 }
2691
2692 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2693 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2694 if (result != JNI_OK) {
2695 return result;
2696 }
2697
2698 // Do final processing now that all arguments have been parsed
2699 result = finalize_vm_init_args(&scp, scp_assembly_required);
2700 if (result != JNI_OK) {
2701 return result;
2702 }
2703
2704 return JNI_OK;
2705 }
2706
2707 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2708 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2709 // are dealing with -agentpath (case where name is a path), otherwise with
2710 // -agentlib
2711 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2712 char *_name;
2713 const char *_hprof = "hprof", *_jdwp = "jdwp";
2714 size_t _len_hprof, _len_jdwp, _len_prefix;
2715
2716 if (is_path) {
2717 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2718 return false;
2719 }
2720
2721 _name++; // skip past last path separator
2722 _len_prefix = strlen(JNI_LIB_PREFIX);
2723
2724 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2725 return false;
2726 }
2727
2728 _name += _len_prefix;
2729 _len_hprof = strlen(_hprof);
2730 _len_jdwp = strlen(_jdwp);
2731
2732 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2733 _name += _len_hprof;
2734 }
2735 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2736 _name += _len_jdwp;
2737 }
2738 else {
2739 return false;
2740 }
2741
2742 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2743 return false;
2744 }
2745
2746 return true;
2747 }
2748
2749 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2750 return true;
2751 }
2752
2753 return false;
2754 }
2755
2756 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2757 SysClassPath* scp_p,
2758 bool* scp_assembly_required_p,
2759 Flag::Flags origin) {
2760 // Remaining part of option string
2761 const char* tail;
2762
2763 // iterate over arguments
2764 for (int index = 0; index < args->nOptions; index++) {
2765 bool is_absolute_path = false; // for -agentpath vs -agentlib
2766
2767 const JavaVMOption* option = args->options + index;
2768
2769 if (!match_option(option, "-Djava.class.path", &tail) &&
2770 !match_option(option, "-Dsun.java.command", &tail) &&
2771 !match_option(option, "-Dsun.java.launcher", &tail)) {
2772
2773 // add all jvm options to the jvm_args string. This string
2774 // is used later to set the java.vm.args PerfData string constant.
2775 // the -Djava.class.path and the -Dsun.java.command options are
2776 // omitted from jvm_args string as each have their own PerfData
2777 // string constant object.
2778 build_jvm_args(option->optionString);
2779 }
2780
2781 // -verbose:[class/gc/jni]
2782 if (match_option(option, "-verbose", &tail)) {
2783 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2784 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2785 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2786 } else if (!strcmp(tail, ":gc")) {
2787 FLAG_SET_CMDLINE(bool, PrintGC, true);
2788 } else if (!strcmp(tail, ":jni")) {
2789 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2790 }
2791 // -da / -ea / -disableassertions / -enableassertions
2792 // These accept an optional class/package name separated by a colon, e.g.,
2793 // -da:java.lang.Thread.
2794 } else if (match_option(option, user_assertion_options, &tail, true)) {
2795 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2796 if (*tail == '\0') {
2797 JavaAssertions::setUserClassDefault(enable);
2798 } else {
2799 assert(*tail == ':', "bogus match by match_option()");
2800 JavaAssertions::addOption(tail + 1, enable);
2801 }
2802 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2803 } else if (match_option(option, system_assertion_options, &tail, false)) {
2804 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2805 JavaAssertions::setSystemClassDefault(enable);
2806 // -bootclasspath:
2807 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2808 scp_p->reset_path(tail);
2809 *scp_assembly_required_p = true;
2810 // -bootclasspath/a:
2811 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2812 scp_p->add_suffix(tail);
2813 *scp_assembly_required_p = true;
2814 // -bootclasspath/p:
2815 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2816 scp_p->add_prefix(tail);
2817 *scp_assembly_required_p = true;
2818 // -Xrun
2819 } else if (match_option(option, "-Xrun", &tail)) {
2820 if (tail != NULL) {
2821 const char* pos = strchr(tail, ':');
2822 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2823 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2824 name[len] = '\0';
2825
2826 char *options = NULL;
2827 if(pos != NULL) {
2828 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2829 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2830 }
2831 #if !INCLUDE_JVMTI
2832 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2833 jio_fprintf(defaultStream::error_stream(),
2834 "Profiling and debugging agents are not supported in this VM\n");
2835 return JNI_ERR;
2836 }
2837 #endif // !INCLUDE_JVMTI
2838 add_init_library(name, options);
2839 }
2840 // -agentlib and -agentpath
2841 } else if (match_option(option, "-agentlib:", &tail) ||
2842 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2843 if(tail != NULL) {
2844 const char* pos = strchr(tail, '=');
2845 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2846 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2847 name[len] = '\0';
2848
2849 char *options = NULL;
2850 if(pos != NULL) {
2851 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2852 }
2853 #if !INCLUDE_JVMTI
2854 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2855 jio_fprintf(defaultStream::error_stream(),
2856 "Profiling and debugging agents are not supported in this VM\n");
2857 return JNI_ERR;
2858 }
2859 #endif // !INCLUDE_JVMTI
2860 add_init_agent(name, options, is_absolute_path);
2861 }
2862 // -javaagent
2863 } else if (match_option(option, "-javaagent:", &tail)) {
2864 #if !INCLUDE_JVMTI
2865 jio_fprintf(defaultStream::error_stream(),
2866 "Instrumentation agents are not supported in this VM\n");
2867 return JNI_ERR;
2868 #else
2869 if(tail != NULL) {
2870 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2871 add_init_agent("instrument", options, false);
2872 }
2873 #endif // !INCLUDE_JVMTI
2874 // -Xnoclassgc
2875 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2876 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2877 // -Xincgc: i-CMS
2878 } else if (match_option(option, "-Xincgc", &tail)) {
2879 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2880 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2881 // -Xnoincgc: no i-CMS
2882 } else if (match_option(option, "-Xnoincgc", &tail)) {
2883 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2884 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2885 // -Xconcgc
2886 } else if (match_option(option, "-Xconcgc", &tail)) {
2887 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2888 // -Xnoconcgc
2889 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2890 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2891 // -Xbatch
2892 } else if (match_option(option, "-Xbatch", &tail)) {
2893 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2894 // -Xmn for compatibility with other JVM vendors
2895 } else if (match_option(option, "-Xmn", &tail)) {
2896 julong long_initial_young_size = 0;
2897 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2898 if (errcode != arg_in_range) {
2899 jio_fprintf(defaultStream::error_stream(),
2900 "Invalid initial young generation size: %s\n", option->optionString);
2901 describe_range_error(errcode);
2902 return JNI_EINVAL;
2903 }
2904 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2905 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2906 // -Xms
2907 } else if (match_option(option, "-Xms", &tail)) {
2908 julong long_initial_heap_size = 0;
2909 // an initial heap size of 0 means automatically determine
2910 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2911 if (errcode != arg_in_range) {
2912 jio_fprintf(defaultStream::error_stream(),
2913 "Invalid initial heap size: %s\n", option->optionString);
2914 describe_range_error(errcode);
2915 return JNI_EINVAL;
2916 }
2917 set_min_heap_size((uintx)long_initial_heap_size);
2918 // Currently the minimum size and the initial heap sizes are the same.
2919 // Can be overridden with -XX:InitialHeapSize.
2920 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2921 // -Xmx
2922 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2923 julong long_max_heap_size = 0;
2924 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2925 if (errcode != arg_in_range) {
2926 jio_fprintf(defaultStream::error_stream(),
2927 "Invalid maximum heap size: %s\n", option->optionString);
2928 describe_range_error(errcode);
2929 return JNI_EINVAL;
2930 }
2931 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2932 // Xmaxf
2933 } else if (match_option(option, "-Xmaxf", &tail)) {
2934 char* err;
2935 int maxf = (int)(strtod(tail, &err) * 100);
2936 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2937 jio_fprintf(defaultStream::error_stream(),
2938 "Bad max heap free percentage size: %s\n",
2939 option->optionString);
2940 return JNI_EINVAL;
2941 } else {
2942 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2943 }
2944 // Xminf
2945 } else if (match_option(option, "-Xminf", &tail)) {
2946 char* err;
2947 int minf = (int)(strtod(tail, &err) * 100);
2948 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2949 jio_fprintf(defaultStream::error_stream(),
2950 "Bad min heap free percentage size: %s\n",
2951 option->optionString);
2952 return JNI_EINVAL;
2953 } else {
2954 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2955 }
2956 // -Xss
2957 } else if (match_option(option, "-Xss", &tail)) {
2958 julong long_ThreadStackSize = 0;
2959 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2960 if (errcode != arg_in_range) {
2961 jio_fprintf(defaultStream::error_stream(),
2962 "Invalid thread stack size: %s\n", option->optionString);
2963 describe_range_error(errcode);
2964 return JNI_EINVAL;
2965 }
2966 // Internally track ThreadStackSize in units of 1024 bytes.
2967 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2968 round_to((int)long_ThreadStackSize, K) / K);
2969 // -Xoss
2970 } else if (match_option(option, "-Xoss", &tail)) {
2971 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2972 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2973 julong long_CodeCacheExpansionSize = 0;
2974 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2975 if (errcode != arg_in_range) {
2976 jio_fprintf(defaultStream::error_stream(),
2977 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2978 os::vm_page_size()/K);
2979 return JNI_EINVAL;
2980 }
2981 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2982 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2983 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2984 julong long_ReservedCodeCacheSize = 0;
2985
2986 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2987 if (errcode != arg_in_range) {
2988 jio_fprintf(defaultStream::error_stream(),
2989 "Invalid maximum code cache size: %s.\n", option->optionString);
2990 return JNI_EINVAL;
2991 }
2992 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2993 // -XX:NonNMethodCodeHeapSize=
2994 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2995 julong long_NonNMethodCodeHeapSize = 0;
2996
2997 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2998 if (errcode != arg_in_range) {
2999 jio_fprintf(defaultStream::error_stream(),
3000 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3001 return JNI_EINVAL;
3002 }
3003 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize);
3004 // -XX:ProfiledCodeHeapSize=
3005 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3006 julong long_ProfiledCodeHeapSize = 0;
3007
3008 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3009 if (errcode != arg_in_range) {
3010 jio_fprintf(defaultStream::error_stream(),
3011 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3012 return JNI_EINVAL;
3013 }
3014 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
3015 // -XX:NonProfiledCodeHeapSizee=
3016 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3017 julong long_NonProfiledCodeHeapSize = 0;
3018
3019 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3020 if (errcode != arg_in_range) {
3021 jio_fprintf(defaultStream::error_stream(),
3022 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3023 return JNI_EINVAL;
3024 }
3025 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
3026 //-XX:IncreaseFirstTierCompileThresholdAt=
3027 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
3028 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
3029 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
3030 jio_fprintf(defaultStream::error_stream(),
3031 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
3032 option->optionString);
3033 return JNI_EINVAL;
3034 }
3035 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
3036 // -green
3037 } else if (match_option(option, "-green", &tail)) {
3038 jio_fprintf(defaultStream::error_stream(),
3039 "Green threads support not available\n");
3040 return JNI_EINVAL;
3041 // -native
3042 } else if (match_option(option, "-native", &tail)) {
3043 // HotSpot always uses native threads, ignore silently for compatibility
3044 // -Xsqnopause
3045 } else if (match_option(option, "-Xsqnopause", &tail)) {
3046 // EVM option, ignore silently for compatibility
3047 // -Xrs
3048 } else if (match_option(option, "-Xrs", &tail)) {
3049 // Classic/EVM option, new functionality
3050 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
3051 } else if (match_option(option, "-Xusealtsigs", &tail)) {
3052 // change default internal VM signals used - lower case for back compat
3053 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
3054 // -Xoptimize
3055 } else if (match_option(option, "-Xoptimize", &tail)) {
3056 // EVM option, ignore silently for compatibility
3057 // -Xprof
3058 } else if (match_option(option, "-Xprof", &tail)) {
3059 #if INCLUDE_FPROF
3060 _has_profile = true;
3061 #else // INCLUDE_FPROF
3062 jio_fprintf(defaultStream::error_stream(),
3063 "Flat profiling is not supported in this VM.\n");
3064 return JNI_ERR;
3065 #endif // INCLUDE_FPROF
3066 // -Xconcurrentio
3067 } else if (match_option(option, "-Xconcurrentio", &tail)) {
3068 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
3069 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
3070 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
3071 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3072 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
3073
3074 // -Xinternalversion
3075 } else if (match_option(option, "-Xinternalversion", &tail)) {
3076 jio_fprintf(defaultStream::output_stream(), "%s\n",
3077 VM_Version::internal_vm_info_string());
3078 vm_exit(0);
3079 #ifndef PRODUCT
3080 // -Xprintflags
3081 } else if (match_option(option, "-Xprintflags", &tail)) {
3082 CommandLineFlags::printFlags(tty, false);
3083 vm_exit(0);
3084 #endif
3085 // -D
3086 } else if (match_option(option, "-D", &tail)) {
3087 if (!add_property(tail)) {
3088 return JNI_ENOMEM;
3089 }
3090 // Out of the box management support
3091 if (match_option(option, "-Dcom.sun.management", &tail)) {
3092 #if INCLUDE_MANAGEMENT
3093 FLAG_SET_CMDLINE(bool, ManagementServer, true);
3094 #else
3095 jio_fprintf(defaultStream::output_stream(),
3096 "-Dcom.sun.management is not supported in this VM.\n");
3097 return JNI_ERR;
3098 #endif
3099 }
3100 // -Xint
3101 } else if (match_option(option, "-Xint", &tail)) {
3102 set_mode_flags(_int);
3103 // -Xmixed
3104 } else if (match_option(option, "-Xmixed", &tail)) {
3105 set_mode_flags(_mixed);
3106 // -Xcomp
3107 } else if (match_option(option, "-Xcomp", &tail)) {
3108 // for testing the compiler; turn off all flags that inhibit compilation
3109 set_mode_flags(_comp);
3110 // -Xshare:dump
3111 } else if (match_option(option, "-Xshare:dump", &tail)) {
3112 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3113 set_mode_flags(_int); // Prevent compilation, which creates objects
3114 // -Xshare:on
3115 } else if (match_option(option, "-Xshare:on", &tail)) {
3116 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3117 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3118 // -Xshare:auto
3119 } else if (match_option(option, "-Xshare:auto", &tail)) {
3120 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3121 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3122 // -Xshare:off
3123 } else if (match_option(option, "-Xshare:off", &tail)) {
3124 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3125 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3126 // -Xverify
3127 } else if (match_option(option, "-Xverify", &tail)) {
3128 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3129 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3130 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3131 } else if (strcmp(tail, ":remote") == 0) {
3132 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3133 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3134 } else if (strcmp(tail, ":none") == 0) {
3135 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3136 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3137 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3138 return JNI_EINVAL;
3139 }
3140 // -Xdebug
3141 } else if (match_option(option, "-Xdebug", &tail)) {
3142 // note this flag has been used, then ignore
3143 set_xdebug_mode(true);
3144 // -Xnoagent
3145 } else if (match_option(option, "-Xnoagent", &tail)) {
3146 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3147 } else if (match_option(option, "-Xboundthreads", &tail)) {
3148 // Bind user level threads to kernel threads (Solaris only)
3149 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3150 } else if (match_option(option, "-Xloggc:", &tail)) {
3151 // Redirect GC output to the file. -Xloggc:<filename>
3152 // ostream_init_log(), when called will use this filename
3153 // to initialize a fileStream.
3154 _gc_log_filename = os::strdup_check_oom(tail);
3155 if (!is_filename_valid(_gc_log_filename)) {
3156 jio_fprintf(defaultStream::output_stream(),
3157 "Invalid file name for use with -Xloggc: Filename can only contain the "
3158 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3159 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3160 return JNI_EINVAL;
3161 }
3162 FLAG_SET_CMDLINE(bool, PrintGC, true);
3163 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3164
3165 // JNI hooks
3166 } else if (match_option(option, "-Xcheck", &tail)) {
3167 if (!strcmp(tail, ":jni")) {
3168 #if !INCLUDE_JNI_CHECK
3169 warning("JNI CHECKING is not supported in this VM");
3170 #else
3171 CheckJNICalls = true;
3172 #endif // INCLUDE_JNI_CHECK
3173 } else if (is_bad_option(option, args->ignoreUnrecognized,
3174 "check")) {
3175 return JNI_EINVAL;
3176 }
3177 } else if (match_option(option, "vfprintf", &tail)) {
3178 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3179 } else if (match_option(option, "exit", &tail)) {
3180 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3181 } else if (match_option(option, "abort", &tail)) {
3182 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3183 // -XX:+AggressiveHeap
3184 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
3185
3186 // This option inspects the machine and attempts to set various
3187 // parameters to be optimal for long-running, memory allocation
3188 // intensive jobs. It is intended for machines with large
3189 // amounts of cpu and memory.
3190
3191 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3192 // VM, but we may not be able to represent the total physical memory
3193 // available (like having 8gb of memory on a box but using a 32bit VM).
3194 // Thus, we need to make sure we're using a julong for intermediate
3195 // calculations.
3196 julong initHeapSize;
3197 julong total_memory = os::physical_memory();
3198
3199 if (total_memory < (julong)256*M) {
3200 jio_fprintf(defaultStream::error_stream(),
3201 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3202 vm_exit(1);
3203 }
3204
3205 // The heap size is half of available memory, or (at most)
3206 // all of possible memory less 160mb (leaving room for the OS
3207 // when using ISM). This is the maximum; because adaptive sizing
3208 // is turned on below, the actual space used may be smaller.
3209
3210 initHeapSize = MIN2(total_memory / (julong)2,
3211 total_memory - (julong)160*M);
3212
3213 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3214
3215 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3216 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3217 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3218 // Currently the minimum size and the initial heap sizes are the same.
3219 set_min_heap_size(initHeapSize);
3220 }
3221 if (FLAG_IS_DEFAULT(NewSize)) {
3222 // Make the young generation 3/8ths of the total heap.
3223 FLAG_SET_CMDLINE(uintx, NewSize,
3224 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3225 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3226 }
3227
3228 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3229 FLAG_SET_DEFAULT(UseLargePages, true);
3230 #endif
3231
3232 // Increase some data structure sizes for efficiency
3233 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3234 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3235 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3236
3237 // See the OldPLABSize comment below, but replace 'after promotion'
3238 // with 'after copying'. YoungPLABSize is the size of the survivor
3239 // space per-gc-thread buffers. The default is 4kw.
3240 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3241
3242 // OldPLABSize is the size of the buffers in the old gen that
3243 // UseParallelGC uses to promote live data that doesn't fit in the
3244 // survivor spaces. At any given time, there's one for each gc thread.
3245 // The default size is 1kw. These buffers are rarely used, since the
3246 // survivor spaces are usually big enough. For specjbb, however, there
3247 // are occasions when there's lots of live data in the young gen
3248 // and we end up promoting some of it. We don't have a definite
3249 // explanation for why bumping OldPLABSize helps, but the theory
3250 // is that a bigger PLAB results in retaining something like the
3251 // original allocation order after promotion, which improves mutator
3252 // locality. A minor effect may be that larger PLABs reduce the
3253 // number of PLAB allocation events during gc. The value of 8kw
3254 // was arrived at by experimenting with specjbb.
3255 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3256
3257 // Enable parallel GC and adaptive generation sizing
3258 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3259 FLAG_SET_DEFAULT(ParallelGCThreads,
3260 Abstract_VM_Version::parallel_worker_threads());
3261
3262 // Encourage steady state memory management
3263 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3264
3265 // This appears to improve mutator locality
3266 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3267
3268 // Get around early Solaris scheduling bug
3269 // (affinity vs other jobs on system)
3270 // but disallow DR and offlining (5008695).
3271 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3272
3273 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3274 // and the last option wins.
3275 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3276 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3277 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3278 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3279 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3280 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3281 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3282 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3283 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3284 uintx max_tenuring_thresh = 0;
3285 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3286 jio_fprintf(defaultStream::error_stream(),
3287 "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3288 }
3289 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3290
3291 if (MaxTenuringThreshold == 0) {
3292 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3293 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3294 } else {
3295 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3296 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3297 }
3298 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3299 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3300 jio_fprintf(defaultStream::error_stream(),
3301 "Please use CMSClassUnloadingEnabled in place of "
3302 "CMSPermGenSweepingEnabled in the future\n");
3303 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3304 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3305 jio_fprintf(defaultStream::error_stream(),
3306 "Please use -XX:+UseGCOverheadLimit in place of "
3307 "-XX:+UseGCTimeLimit in the future\n");
3308 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3309 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3310 jio_fprintf(defaultStream::error_stream(),
3311 "Please use -XX:-UseGCOverheadLimit in place of "
3312 "-XX:-UseGCTimeLimit in the future\n");
3313 // The TLE options are for compatibility with 1.3 and will be
3314 // removed without notice in a future release. These options
3315 // are not to be documented.
3316 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3317 // No longer used.
3318 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3319 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3320 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3321 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3322 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3323 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3324 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3325 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3326 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3327 // No longer used.
3328 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3329 julong long_tlab_size = 0;
3330 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3331 if (errcode != arg_in_range) {
3332 jio_fprintf(defaultStream::error_stream(),
3333 "Invalid TLAB size: %s\n", option->optionString);
3334 describe_range_error(errcode);
3335 return JNI_EINVAL;
3336 }
3337 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3338 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3339 // No longer used.
3340 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3341 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3342 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3343 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3344 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3345 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3346 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3347 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3348 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3349 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3350 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3351 #if defined(DTRACE_ENABLED)
3352 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3353 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3354 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3355 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3356 #else // defined(DTRACE_ENABLED)
3357 jio_fprintf(defaultStream::error_stream(),
3358 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3359 return JNI_EINVAL;
3360 #endif // defined(DTRACE_ENABLED)
3361 #ifdef ASSERT
3362 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3363 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3364 // disable scavenge before parallel mark-compact
3365 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3366 #endif
3367 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3368 julong cms_blocks_to_claim = (julong)atol(tail);
3369 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3370 jio_fprintf(defaultStream::error_stream(),
3371 "Please use -XX:OldPLABSize in place of "
3372 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3373 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3374 julong cms_blocks_to_claim = (julong)atol(tail);
3375 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3376 jio_fprintf(defaultStream::error_stream(),
3377 "Please use -XX:OldPLABSize in place of "
3378 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3379 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3380 julong old_plab_size = 0;
3381 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3382 if (errcode != arg_in_range) {
3383 jio_fprintf(defaultStream::error_stream(),
3384 "Invalid old PLAB size: %s\n", option->optionString);
3385 describe_range_error(errcode);
3386 return JNI_EINVAL;
3387 }
3388 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3389 jio_fprintf(defaultStream::error_stream(),
3390 "Please use -XX:OldPLABSize in place of "
3391 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3392 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3393 julong young_plab_size = 0;
3394 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3395 if (errcode != arg_in_range) {
3396 jio_fprintf(defaultStream::error_stream(),
3397 "Invalid young PLAB size: %s\n", option->optionString);
3398 describe_range_error(errcode);
3399 return JNI_EINVAL;
3400 }
3401 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3402 jio_fprintf(defaultStream::error_stream(),
3403 "Please use -XX:YoungPLABSize in place of "
3404 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3405 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3406 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3407 julong stack_size = 0;
3408 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3409 if (errcode != arg_in_range) {
3410 jio_fprintf(defaultStream::error_stream(),
3411 "Invalid mark stack size: %s\n", option->optionString);
3412 describe_range_error(errcode);
3413 return JNI_EINVAL;
3414 }
3415 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3416 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3417 julong max_stack_size = 0;
3418 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3419 if (errcode != arg_in_range) {
3420 jio_fprintf(defaultStream::error_stream(),
3421 "Invalid maximum mark stack size: %s\n",
3422 option->optionString);
3423 describe_range_error(errcode);
3424 return JNI_EINVAL;
3425 }
3426 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3427 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3428 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3429 uintx conc_threads = 0;
3430 if (!parse_uintx(tail, &conc_threads, 1)) {
3431 jio_fprintf(defaultStream::error_stream(),
3432 "Invalid concurrent threads: %s\n", option->optionString);
3433 return JNI_EINVAL;
3434 }
3435 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3436 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3437 julong max_direct_memory_size = 0;
3438 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3439 if (errcode != arg_in_range) {
3440 jio_fprintf(defaultStream::error_stream(),
3441 "Invalid maximum direct memory size: %s\n",
3442 option->optionString);
3443 describe_range_error(errcode);
3444 return JNI_EINVAL;
3445 }
3446 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3447 #if !INCLUDE_MANAGEMENT
3448 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3449 jio_fprintf(defaultStream::error_stream(),
3450 "ManagementServer is not supported in this VM.\n");
3451 return JNI_ERR;
3452 #endif // INCLUDE_MANAGEMENT
3453 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3454 // Skip -XX:Flags= since that case has already been handled
3455 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3456 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3457 return JNI_EINVAL;
3458 }
3459 }
3460 // Unknown option
3461 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3462 return JNI_ERR;
3463 }
3464 }
3465
3466 // PrintSharedArchiveAndExit will turn on
3467 // -Xshare:on
3468 // -XX:+TraceClassPaths
3469 if (PrintSharedArchiveAndExit) {
3470 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3471 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3472 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3473 }
3474
3475 // Change the default value for flags which have different default values
3476 // when working with older JDKs.
3477 #ifdef LINUX
3478 if (JDK_Version::current().compare_major(6) <= 0 &&
3479 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3480 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3481 }
3482 #endif // LINUX
3483 fix_appclasspath();
3484 return JNI_OK;
3485 }
3486
3487 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3488 //
3489 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3490 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3491 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3492 // path is treated as the current directory.
3493 //
3494 // This causes problems with CDS, which requires that all directories specified in the classpath
3495 // must be empty. In most cases, applications do NOT want to load classes from the current
3496 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3497 // scripts compatible with CDS.
3498 void Arguments::fix_appclasspath() {
3499 if (IgnoreEmptyClassPaths) {
3500 const char separator = *os::path_separator();
3501 const char* src = _java_class_path->value();
3502
3503 // skip over all the leading empty paths
3504 while (*src == separator) {
3505 src ++;
3506 }
3507
3508 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3509 strncpy(copy, src, strlen(src) + 1);
3510
3511 // trim all trailing empty paths
3512 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3513 *tail = '\0';
3514 }
3515
3516 char from[3] = {separator, separator, '\0'};
3517 char to [2] = {separator, '\0'};
3518 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3519 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3520 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3521 }
3522
3523 _java_class_path->set_value(copy);
3524 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3525 }
3526
3527 if (!PrintSharedArchiveAndExit) {
3528 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3529 }
3530 }
3531
3532 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3533 // This must be done after all -D arguments have been processed.
3534 scp_p->expand_endorsed();
3535
3536 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3537 // Assemble the bootclasspath elements into the final path.
3538 Arguments::set_sysclasspath(scp_p->combined_path());
3539 }
3540
3541 // This must be done after all arguments have been processed.
3542 // java_compiler() true means set to "NONE" or empty.
3543 if (java_compiler() && !xdebug_mode()) {
3544 // For backwards compatibility, we switch to interpreted mode if
3545 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3546 // not specified.
3547 set_mode_flags(_int);
3548 }
3549
3550 if ((TieredCompilation && CompileThresholdScaling == 0)
3551 || (!TieredCompilation && get_scaled_compile_threshold(CompileThreshold) == 0)) {
3552 set_mode_flags(_int);
3553 }
3554
3555 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3556 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3557 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3558 }
3559
3560 #ifndef COMPILER2
3561 // Don't degrade server performance for footprint
3562 if (FLAG_IS_DEFAULT(UseLargePages) &&
3563 MaxHeapSize < LargePageHeapSizeThreshold) {
3564 // No need for large granularity pages w/small heaps.
3565 // Note that large pages are enabled/disabled for both the
3566 // Java heap and the code cache.
3567 FLAG_SET_DEFAULT(UseLargePages, false);
3568 }
3569
3570 #else
3571 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3572 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3573 }
3574 #endif
3575
3576 #ifndef TIERED
3577 // Tiered compilation is undefined.
3578 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3579 #endif
3580
3581 // If we are running in a headless jre, force java.awt.headless property
3582 // to be true unless the property has already been set.
3583 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3584 if (os::is_headless_jre()) {
3585 const char* headless = Arguments::get_property("java.awt.headless");
3586 if (headless == NULL) {
3587 char envbuffer[128];
3588 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3589 if (!add_property("java.awt.headless=true")) {
3590 return JNI_ENOMEM;
3591 }
3592 } else {
3593 char buffer[256];
3594 strcpy(buffer, "java.awt.headless=");
3595 strcat(buffer, envbuffer);
3596 if (!add_property(buffer)) {
3597 return JNI_ENOMEM;
3598 }
3599 }
3600 }
3601 }
3602
3603 if (!ArgumentsExt::check_vm_args_consistency()) {
3604 return JNI_ERR;
3605 }
3606
3607 return JNI_OK;
3608 }
3609
3610 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3611 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3612 scp_assembly_required_p);
3613 }
3614
3615 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3616 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3617 scp_assembly_required_p);
3618 }
3619
3620 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3621 const int N_MAX_OPTIONS = 64;
3622 const int OPTION_BUFFER_SIZE = 1024;
3623 char buffer[OPTION_BUFFER_SIZE];
3624
3625 // The variable will be ignored if it exceeds the length of the buffer.
3626 // Don't check this variable if user has special privileges
3627 // (e.g. unix su command).
3628 if (os::getenv(name, buffer, sizeof(buffer)) &&
3629 !os::have_special_privileges()) {
3630 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3631 jio_fprintf(defaultStream::error_stream(),
3632 "Picked up %s: %s\n", name, buffer);
3633 char* rd = buffer; // pointer to the input string (rd)
3634 int i;
3635 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3636 while (isspace(*rd)) rd++; // skip whitespace
3637 if (*rd == 0) break; // we re done when the input string is read completely
3638
3639 // The output, option string, overwrites the input string.
3640 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3641 // input string (rd).
3642 char* wrt = rd;
3643
3644 options[i++].optionString = wrt; // Fill in option
3645 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3646 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3647 int quote = *rd; // matching quote to look for
3648 rd++; // don't copy open quote
3649 while (*rd != quote) { // include everything (even spaces) up until quote
3650 if (*rd == 0) { // string termination means unmatched string
3651 jio_fprintf(defaultStream::error_stream(),
3652 "Unmatched quote in %s\n", name);
3653 return JNI_ERR;
3654 }
3655 *wrt++ = *rd++; // copy to option string
3656 }
3657 rd++; // don't copy close quote
3658 } else {
3659 *wrt++ = *rd++; // copy to option string
3660 }
3661 }
3662 // Need to check if we're done before writing a NULL,
3663 // because the write could be to the byte that rd is pointing to.
3664 if (*rd++ == 0) {
3665 *wrt = 0;
3666 break;
3667 }
3668 *wrt = 0; // Zero terminate option
3669 }
3670 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3671 JavaVMInitArgs vm_args;
3672 vm_args.version = JNI_VERSION_1_2;
3673 vm_args.options = options;
3674 vm_args.nOptions = i;
3675 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3676
3677 if (PrintVMOptions) {
3678 const char* tail;
3679 for (int i = 0; i < vm_args.nOptions; i++) {
3680 const JavaVMOption *option = vm_args.options + i;
3681 if (match_option(option, "-XX:", &tail)) {
3682 logOption(tail);
3683 }
3684 }
3685 }
3686
3687 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3688 }
3689 return JNI_OK;
3690 }
3691
3692 void Arguments::set_shared_spaces_flags() {
3693 if (DumpSharedSpaces) {
3694 if (RequireSharedSpaces) {
3695 warning("cannot dump shared archive while using shared archive");
3696 }
3697 UseSharedSpaces = false;
3698 #ifdef _LP64
3699 if (!UseCompressedOops || !UseCompressedClassPointers) {
3700 vm_exit_during_initialization(
3701 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3702 }
3703 } else {
3704 if (!UseCompressedOops || !UseCompressedClassPointers) {
3705 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3706 }
3707 #endif
3708 }
3709 }
3710
3711 #if !INCLUDE_ALL_GCS
3712 static void force_serial_gc() {
3713 FLAG_SET_DEFAULT(UseSerialGC, true);
3714 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3715 UNSUPPORTED_GC_OPTION(UseG1GC);
3716 UNSUPPORTED_GC_OPTION(UseParallelGC);
3717 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3718 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3719 UNSUPPORTED_GC_OPTION(UseParNewGC);
3720 }
3721 #endif // INCLUDE_ALL_GCS
3722
3723 // Sharing support
3724 // Construct the path to the archive
3725 static char* get_shared_archive_path() {
3726 char *shared_archive_path;
3727 if (SharedArchiveFile == NULL) {
3728 char jvm_path[JVM_MAXPATHLEN];
3729 os::jvm_path(jvm_path, sizeof(jvm_path));
3730 char *end = strrchr(jvm_path, *os::file_separator());
3731 if (end != NULL) *end = '\0';
3732 size_t jvm_path_len = strlen(jvm_path);
3733 size_t file_sep_len = strlen(os::file_separator());
3734 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3735 file_sep_len + 20, mtInternal);
3736 if (shared_archive_path != NULL) {
3737 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3738 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3739 strncat(shared_archive_path, "classes.jsa", 11);
3740 }
3741 } else {
3742 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3743 if (shared_archive_path != NULL) {
3744 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3745 }
3746 }
3747 return shared_archive_path;
3748 }
3749
3750 #ifndef PRODUCT
3751 // Determine whether LogVMOutput should be implicitly turned on.
3752 static bool use_vm_log() {
3753 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3754 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3755 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3756 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3757 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3758 return true;
3759 }
3760
3761 #ifdef COMPILER1
3762 if (PrintC1Statistics) {
3763 return true;
3764 }
3765 #endif // COMPILER1
3766
3767 #ifdef COMPILER2
3768 if (PrintOptoAssembly || PrintOptoStatistics) {
3769 return true;
3770 }
3771 #endif // COMPILER2
3772
3773 return false;
3774 }
3775 #endif // PRODUCT
3776
3777 // Parse entry point called from JNI_CreateJavaVM
3778
3779 jint Arguments::parse(const JavaVMInitArgs* args) {
3780
3781 // Remaining part of option string
3782 const char* tail;
3783
3784 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3785 const char* hotspotrc = ".hotspotrc";
3786 bool settings_file_specified = false;
3787 bool needs_hotspotrc_warning = false;
3788
3789 const char* flags_file;
3790 int index;
3791 for (index = 0; index < args->nOptions; index++) {
3792 const JavaVMOption *option = args->options + index;
3793 if (ArgumentsExt::process_options(option)) {
3794 continue;
3795 }
3796 if (match_option(option, "-XX:Flags=", &tail)) {
3797 flags_file = tail;
3798 settings_file_specified = true;
3799 continue;
3800 }
3801 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3802 PrintVMOptions = true;
3803 continue;
3804 }
3805 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3806 PrintVMOptions = false;
3807 continue;
3808 }
3809 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3810 IgnoreUnrecognizedVMOptions = true;
3811 continue;
3812 }
3813 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3814 IgnoreUnrecognizedVMOptions = false;
3815 continue;
3816 }
3817 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3818 CommandLineFlags::printFlags(tty, false);
3819 vm_exit(0);
3820 }
3821 #if INCLUDE_NMT
3822 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3823 // The launcher did not setup nmt environment variable properly.
3824 if (!MemTracker::check_launcher_nmt_support(tail)) {
3825 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3826 }
3827
3828 // Verify if nmt option is valid.
3829 if (MemTracker::verify_nmt_option()) {
3830 // Late initialization, still in single-threaded mode.
3831 if (MemTracker::tracking_level() >= NMT_summary) {
3832 MemTracker::init();
3833 }
3834 } else {
3835 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3836 }
3837 continue;
3838 }
3839 #endif
3840
3841
3842 #ifndef PRODUCT
3843 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3844 CommandLineFlags::printFlags(tty, true);
3845 vm_exit(0);
3846 }
3847 #endif
3848 }
3849
3850 if (IgnoreUnrecognizedVMOptions) {
3851 // uncast const to modify the flag args->ignoreUnrecognized
3852 *(jboolean*)(&args->ignoreUnrecognized) = true;
3853 }
3854
3855 // Parse specified settings file
3856 if (settings_file_specified) {
3857 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3858 return JNI_EINVAL;
3859 }
3860 } else {
3861 #ifdef ASSERT
3862 // Parse default .hotspotrc settings file
3863 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3864 return JNI_EINVAL;
3865 }
3866 #else
3867 struct stat buf;
3868 if (os::stat(hotspotrc, &buf) == 0) {
3869 needs_hotspotrc_warning = true;
3870 }
3871 #endif
3872 }
3873
3874 if (PrintVMOptions) {
3875 for (index = 0; index < args->nOptions; index++) {
3876 const JavaVMOption *option = args->options + index;
3877 if (match_option(option, "-XX:", &tail)) {
3878 logOption(tail);
3879 }
3880 }
3881 }
3882
3883 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3884 jint result = parse_vm_init_args(args);
3885 if (result != JNI_OK) {
3886 return result;
3887 }
3888
3889 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3890 SharedArchivePath = get_shared_archive_path();
3891 if (SharedArchivePath == NULL) {
3892 return JNI_ENOMEM;
3893 }
3894
3895 // Set up VerifySharedSpaces
3896 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3897 VerifySharedSpaces = true;
3898 }
3899
3900 // Delay warning until here so that we've had a chance to process
3901 // the -XX:-PrintWarnings flag
3902 if (needs_hotspotrc_warning) {
3903 warning("%s file is present but has been ignored. "
3904 "Run with -XX:Flags=%s to load the file.",
3905 hotspotrc, hotspotrc);
3906 }
3907
3908 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3909 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3910 #endif
3911
3912 #if INCLUDE_ALL_GCS
3913 #if (defined JAVASE_EMBEDDED || defined ARM)
3914 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3915 #endif
3916 #endif
3917
3918 #ifndef PRODUCT
3919 if (TraceBytecodesAt != 0) {
3920 TraceBytecodes = true;
3921 }
3922 if (CountCompiledCalls) {
3923 if (UseCounterDecay) {
3924 warning("UseCounterDecay disabled because CountCalls is set");
3925 UseCounterDecay = false;
3926 }
3927 }
3928 #endif // PRODUCT
3929
3930 if (ScavengeRootsInCode == 0) {
3931 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3932 warning("forcing ScavengeRootsInCode non-zero");
3933 }
3934 ScavengeRootsInCode = 1;
3935 }
3936
3937 if (PrintGCDetails) {
3938 // Turn on -verbose:gc options as well
3939 PrintGC = true;
3940 }
3941
3942 // Set object alignment values.
3943 set_object_alignment();
3944
3945 #if !INCLUDE_ALL_GCS
3946 force_serial_gc();
3947 #endif // INCLUDE_ALL_GCS
3948 #if !INCLUDE_CDS
3949 if (DumpSharedSpaces || RequireSharedSpaces) {
3950 jio_fprintf(defaultStream::error_stream(),
3951 "Shared spaces are not supported in this VM\n");
3952 return JNI_ERR;
3953 }
3954 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3955 warning("Shared spaces are not supported in this VM");
3956 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3957 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3958 }
3959 no_shared_spaces("CDS Disabled");
3960 #endif // INCLUDE_CDS
3961
3962 return JNI_OK;
3963 }
3964
3965 jint Arguments::apply_ergo() {
3966
3967 // Set flags based on ergonomics.
3968 set_ergonomics_flags();
3969
3970 set_shared_spaces_flags();
3971
3972 // Check the GC selections again.
3973 if (!ArgumentsExt::check_gc_consistency_ergo()) {
3974 return JNI_EINVAL;
3975 }
3976
3977 if (TieredCompilation) {
3978 set_tiered_flags();
3979 } else {
3980 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3981 if (CompilationPolicyChoice >= 2) {
3982 vm_exit_during_initialization(
3983 "Incompatible compilation policy selected", NULL);
3984 }
3985 // Scale CompileThreshold
3986 if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) {
3987 FLAG_SET_ERGO(intx, CompileThreshold, get_scaled_compile_threshold(CompileThreshold));
3988 }
3989 }
3990
3991 #ifdef COMPILER2
3992 #ifndef PRODUCT
3993 if (PrintIdealGraphLevel > 0) {
3994 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
3995 }
3996 #endif
3997 #endif
3998
3999 // Set heap size based on available physical memory
4000 set_heap_size();
4001
4002 set_gc_specific_flags();
4003
4004 // Initialize Metaspace flags and alignments
4005 Metaspace::ergo_initialize();
4006
4007 // Set bytecode rewriting flags
4008 set_bytecode_flags();
4009
4010 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4011 set_aggressive_opts_flags();
4012
4013 // Turn off biased locking for locking debug mode flags,
4014 // which are subtly different from each other but neither works with
4015 // biased locking
4016 if (UseHeavyMonitors
4017 #ifdef COMPILER1
4018 || !UseFastLocking
4019 #endif // COMPILER1
4020 ) {
4021 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4022 // flag set to true on command line; warn the user that they
4023 // can't enable biased locking here
4024 warning("Biased Locking is not supported with locking debug flags"
4025 "; ignoring UseBiasedLocking flag." );
4026 }
4027 UseBiasedLocking = false;
4028 }
4029
4030 #ifdef ZERO
4031 // Clear flags not supported on zero.
4032 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4033 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4034 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4035 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4036 #endif // CC_INTERP
4037
4038 #ifdef COMPILER2
4039 if (!EliminateLocks) {
4040 EliminateNestedLocks = false;
4041 }
4042 if (!Inline) {
4043 IncrementalInline = false;
4044 }
4045 #ifndef PRODUCT
4046 if (!IncrementalInline) {
4047 AlwaysIncrementalInline = false;
4048 }
4049 #endif
4050 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4051 // nothing to use the profiling, turn if off
4052 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4053 }
4054 #endif
4055
4056 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4057 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4058 DebugNonSafepoints = true;
4059 }
4060
4061 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4062 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4063 }
4064
4065 #ifndef PRODUCT
4066 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4067 if (use_vm_log()) {
4068 LogVMOutput = true;
4069 }
4070 }
4071 #endif // PRODUCT
4072
4073 if (PrintCommandLineFlags) {
4074 CommandLineFlags::printSetFlags(tty);
4075 }
4076
4077 // Apply CPU specific policy for the BiasedLocking
4078 if (UseBiasedLocking) {
4079 if (!VM_Version::use_biased_locking() &&
4080 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4081 UseBiasedLocking = false;
4082 }
4083 }
4084 #ifdef COMPILER2
4085 if (!UseBiasedLocking || EmitSync != 0) {
4086 UseOptoBiasInlining = false;
4087 }
4088 #endif
4089
4090 return JNI_OK;
4091 }
4092
4093 jint Arguments::adjust_after_os() {
4094 if (UseNUMA) {
4095 if (UseParallelGC || UseParallelOldGC) {
4096 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4097 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4098 }
4099 }
4100 // UseNUMAInterleaving is set to ON for all collectors and
4101 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4102 // such as the parallel collector for Linux and Solaris will
4103 // interleave old gen and survivor spaces on top of NUMA
4104 // allocation policy for the eden space.
4105 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4106 // all platforms and ParallelGC on Windows will interleave all
4107 // of the heap spaces across NUMA nodes.
4108 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4109 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4110 }
4111 }
4112 return JNI_OK;
4113 }
4114
4115 int Arguments::PropertyList_count(SystemProperty* pl) {
4116 int count = 0;
4117 while(pl != NULL) {
4118 count++;
4119 pl = pl->next();
4120 }
4121 return count;
4122 }
4123
4124 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4125 assert(key != NULL, "just checking");
4126 SystemProperty* prop;
4127 for (prop = pl; prop != NULL; prop = prop->next()) {
4128 if (strcmp(key, prop->key()) == 0) return prop->value();
4129 }
4130 return NULL;
4131 }
4132
4133 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4134 int count = 0;
4135 const char* ret_val = NULL;
4136
4137 while(pl != NULL) {
4138 if(count >= index) {
4139 ret_val = pl->key();
4140 break;
4141 }
4142 count++;
4143 pl = pl->next();
4144 }
4145
4146 return ret_val;
4147 }
4148
4149 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4150 int count = 0;
4151 char* ret_val = NULL;
4152
4153 while(pl != NULL) {
4154 if(count >= index) {
4155 ret_val = pl->value();
4156 break;
4157 }
4158 count++;
4159 pl = pl->next();
4160 }
4161
4162 return ret_val;
4163 }
4164
4165 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4166 SystemProperty* p = *plist;
4167 if (p == NULL) {
4168 *plist = new_p;
4169 } else {
4170 while (p->next() != NULL) {
4171 p = p->next();
4172 }
4173 p->set_next(new_p);
4174 }
4175 }
4176
4177 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4178 if (plist == NULL)
4179 return;
4180
4181 SystemProperty* new_p = new SystemProperty(k, v, true);
4182 PropertyList_add(plist, new_p);
4183 }
4184
4185 // This add maintains unique property key in the list.
4186 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4187 if (plist == NULL)
4188 return;
4189
4190 // If property key exist then update with new value.
4191 SystemProperty* prop;
4192 for (prop = *plist; prop != NULL; prop = prop->next()) {
4193 if (strcmp(k, prop->key()) == 0) {
4194 if (append) {
4195 prop->append_value(v);
4196 } else {
4197 prop->set_value(v);
4198 }
4199 return;
4200 }
4201 }
4202
4203 PropertyList_add(plist, k, v);
4204 }
4205
4206 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4207 // Returns true if all of the source pointed by src has been copied over to
4208 // the destination buffer pointed by buf. Otherwise, returns false.
4209 // Notes:
4210 // 1. If the length (buflen) of the destination buffer excluding the
4211 // NULL terminator character is not long enough for holding the expanded
4212 // pid characters, it also returns false instead of returning the partially
4213 // expanded one.
4214 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4215 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4216 char* buf, size_t buflen) {
4217 const char* p = src;
4218 char* b = buf;
4219 const char* src_end = &src[srclen];
4220 char* buf_end = &buf[buflen - 1];
4221
4222 while (p < src_end && b < buf_end) {
4223 if (*p == '%') {
4224 switch (*(++p)) {
4225 case '%': // "%%" ==> "%"
4226 *b++ = *p++;
4227 break;
4228 case 'p': { // "%p" ==> current process id
4229 // buf_end points to the character before the last character so
4230 // that we could write '\0' to the end of the buffer.
4231 size_t buf_sz = buf_end - b + 1;
4232 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4233
4234 // if jio_snprintf fails or the buffer is not long enough to hold
4235 // the expanded pid, returns false.
4236 if (ret < 0 || ret >= (int)buf_sz) {
4237 return false;
4238 } else {
4239 b += ret;
4240 assert(*b == '\0', "fail in copy_expand_pid");
4241 if (p == src_end && b == buf_end + 1) {
4242 // reach the end of the buffer.
4243 return true;
4244 }
4245 }
4246 p++;
4247 break;
4248 }
4249 default :
4250 *b++ = '%';
4251 }
4252 } else {
4253 *b++ = *p++;
4254 }
4255 }
4256 *b = '\0';
4257 return (p == src_end); // return false if not all of the source was copied
4258 }