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 size_t len = strlen(flag_status.name);
331 if (((strncmp(flag_status.name, s, len) == 0) &&
332 (strlen(s) == len)) ||
333 ((s[0] == '+' || s[0] == '-') &&
334 (strlen(&s[1]) == len) &&
335 (strncmp(flag_status.name, &s[1], len) == 0))
336 ) {
337 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
338 *version = flag_status.obsoleted_in;
339 return true;
340 }
341 }
342 i++;
343 }
344 return false;
345 }
346
347 // Constructs the system class path (aka boot class path) from the following
348 // components, in order:
349 //
350 // prefix // from -Xbootclasspath/p:...
351 // endorsed // the expansion of -Djava.endorsed.dirs=...
352 // base // from os::get_system_properties() or -Xbootclasspath=
353 // suffix // from -Xbootclasspath/a:...
354 //
355 // java.endorsed.dirs is a list of directories; any jar or zip files in the
356 // directories are added to the sysclasspath just before the base.
357 //
358 // This could be AllStatic, but it isn't needed after argument processing is
359 // complete.
360 class SysClassPath: public StackObj {
361 public:
362 SysClassPath(const char* base);
363 ~SysClassPath();
364
365 inline void set_base(const char* base);
366 inline void add_prefix(const char* prefix);
367 inline void add_suffix_to_prefix(const char* suffix);
368 inline void add_suffix(const char* suffix);
369 inline void reset_path(const char* base);
370
371 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
372 // property. Must be called after all command-line arguments have been
373 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
374 // combined_path().
375 void expand_endorsed();
376
377 inline const char* get_base() const { return _items[_scp_base]; }
378 inline const char* get_prefix() const { return _items[_scp_prefix]; }
379 inline const char* get_suffix() const { return _items[_scp_suffix]; }
380 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
381
382 // Combine all the components into a single c-heap-allocated string; caller
383 // must free the string if/when no longer needed.
384 char* combined_path();
385
386 private:
387 // Utility routines.
388 static char* add_to_path(const char* path, const char* str, bool prepend);
389 static char* add_jars_to_path(char* path, const char* directory);
390
391 inline void reset_item_at(int index);
392
393 // Array indices for the items that make up the sysclasspath. All except the
394 // base are allocated in the C heap and freed by this class.
395 enum {
396 _scp_prefix, // from -Xbootclasspath/p:...
397 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
398 _scp_base, // the default sysclasspath
399 _scp_suffix, // from -Xbootclasspath/a:...
400 _scp_nitems // the number of items, must be last.
401 };
402
403 const char* _items[_scp_nitems];
404 DEBUG_ONLY(bool _expansion_done;)
405 };
406
407 SysClassPath::SysClassPath(const char* base) {
408 memset(_items, 0, sizeof(_items));
409 _items[_scp_base] = base;
410 DEBUG_ONLY(_expansion_done = false;)
411 }
412
413 SysClassPath::~SysClassPath() {
414 // Free everything except the base.
415 for (int i = 0; i < _scp_nitems; ++i) {
416 if (i != _scp_base) reset_item_at(i);
417 }
418 DEBUG_ONLY(_expansion_done = false;)
419 }
420
421 inline void SysClassPath::set_base(const char* base) {
422 _items[_scp_base] = base;
423 }
424
425 inline void SysClassPath::add_prefix(const char* prefix) {
426 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
427 }
428
429 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
430 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
431 }
432
433 inline void SysClassPath::add_suffix(const char* suffix) {
434 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
435 }
436
437 inline void SysClassPath::reset_item_at(int index) {
438 assert(index < _scp_nitems && index != _scp_base, "just checking");
439 if (_items[index] != NULL) {
440 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
441 _items[index] = NULL;
442 }
443 }
444
445 inline void SysClassPath::reset_path(const char* base) {
446 // Clear the prefix and suffix.
447 reset_item_at(_scp_prefix);
448 reset_item_at(_scp_suffix);
449 set_base(base);
450 }
451
452 //------------------------------------------------------------------------------
453
454 void SysClassPath::expand_endorsed() {
455 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
456
457 const char* path = Arguments::get_property("java.endorsed.dirs");
458 if (path == NULL) {
459 path = Arguments::get_endorsed_dir();
460 assert(path != NULL, "no default for java.endorsed.dirs");
461 }
462
463 char* expanded_path = NULL;
464 const char separator = *os::path_separator();
465 const char* const end = path + strlen(path);
466 while (path < end) {
467 const char* tmp_end = strchr(path, separator);
468 if (tmp_end == NULL) {
469 expanded_path = add_jars_to_path(expanded_path, path);
470 path = end;
471 } else {
472 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
473 memcpy(dirpath, path, tmp_end - path);
474 dirpath[tmp_end - path] = '\0';
475 expanded_path = add_jars_to_path(expanded_path, dirpath);
476 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
477 path = tmp_end + 1;
478 }
479 }
480 _items[_scp_endorsed] = expanded_path;
481 DEBUG_ONLY(_expansion_done = true;)
482 }
483
484 // Combine the bootclasspath elements, some of which may be null, into a single
485 // c-heap-allocated string.
486 char* SysClassPath::combined_path() {
487 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
488 assert(_expansion_done, "must call expand_endorsed() first.");
489
490 size_t lengths[_scp_nitems];
491 size_t total_len = 0;
492
493 const char separator = *os::path_separator();
494
495 // Get the lengths.
496 int i;
497 for (i = 0; i < _scp_nitems; ++i) {
498 if (_items[i] != NULL) {
499 lengths[i] = strlen(_items[i]);
500 // Include space for the separator char (or a NULL for the last item).
501 total_len += lengths[i] + 1;
502 }
503 }
504 assert(total_len > 0, "empty sysclasspath not allowed");
505
506 // Copy the _items to a single string.
507 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
508 char* cp_tmp = cp;
509 for (i = 0; i < _scp_nitems; ++i) {
510 if (_items[i] != NULL) {
511 memcpy(cp_tmp, _items[i], lengths[i]);
512 cp_tmp += lengths[i];
513 *cp_tmp++ = separator;
514 }
515 }
516 *--cp_tmp = '\0'; // Replace the extra separator.
517 return cp;
518 }
519
520 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
521 char*
522 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
523 char *cp;
524
525 assert(str != NULL, "just checking");
526 if (path == NULL) {
527 size_t len = strlen(str) + 1;
528 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
529 memcpy(cp, str, len); // copy the trailing null
530 } else {
531 const char separator = *os::path_separator();
532 size_t old_len = strlen(path);
533 size_t str_len = strlen(str);
534 size_t len = old_len + str_len + 2;
535
536 if (prepend) {
537 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
538 char* cp_tmp = cp;
539 memcpy(cp_tmp, str, str_len);
540 cp_tmp += str_len;
541 *cp_tmp = separator;
542 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
543 FREE_C_HEAP_ARRAY(char, path, mtInternal);
544 } else {
545 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
546 char* cp_tmp = cp + old_len;
547 *cp_tmp = separator;
548 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
549 }
550 }
551 return cp;
552 }
553
554 // Scan the directory and append any jar or zip files found to path.
555 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
556 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
557 DIR* dir = os::opendir(directory);
558 if (dir == NULL) return path;
559
560 char dir_sep[2] = { '\0', '\0' };
561 size_t directory_len = strlen(directory);
562 const char fileSep = *os::file_separator();
563 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
564
565 /* Scan the directory for jars/zips, appending them to path. */
566 struct dirent *entry;
567 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
568 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
569 const char* name = entry->d_name;
570 const char* ext = name + strlen(name) - 4;
571 bool isJarOrZip = ext > name &&
572 (os::file_name_strcmp(ext, ".jar") == 0 ||
573 os::file_name_strcmp(ext, ".zip") == 0);
574 if (isJarOrZip) {
575 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
576 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
577 path = add_to_path(path, jarpath, false);
578 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
579 }
580 }
581 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
582 os::closedir(dir);
583 return path;
584 }
585
586 // Parses a memory size specification string.
587 static bool atomull(const char *s, julong* result) {
588 julong n = 0;
589 int args_read = 0;
590 bool is_hex = false;
591 // Skip leading 0[xX] for hexadecimal
592 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
593 s += 2;
594 is_hex = true;
595 args_read = sscanf(s, JULONG_FORMAT_X, &n);
596 } else {
597 args_read = sscanf(s, JULONG_FORMAT, &n);
598 }
599 if (args_read != 1) {
600 return false;
601 }
602 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
603 s++;
604 }
605 // 4705540: illegal if more characters are found after the first non-digit
606 if (strlen(s) > 1) {
607 return false;
608 }
609 switch (*s) {
610 case 'T': case 't':
611 *result = n * G * K;
612 // Check for overflow.
613 if (*result/((julong)G * K) != n) return false;
614 return true;
615 case 'G': case 'g':
616 *result = n * G;
617 if (*result/G != n) return false;
618 return true;
619 case 'M': case 'm':
620 *result = n * M;
621 if (*result/M != n) return false;
622 return true;
623 case 'K': case 'k':
624 *result = n * K;
625 if (*result/K != n) return false;
626 return true;
627 case '\0':
628 *result = n;
629 return true;
630 default:
631 return false;
632 }
633 }
634
635 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
636 if (size < min_size) return arg_too_small;
637 // Check that size will fit in a size_t (only relevant on 32-bit)
638 if (size > max_uintx) return arg_too_big;
639 return arg_in_range;
640 }
641
642 // Describe an argument out of range error
643 void Arguments::describe_range_error(ArgsRange errcode) {
644 switch(errcode) {
645 case arg_too_big:
646 jio_fprintf(defaultStream::error_stream(),
647 "The specified size exceeds the maximum "
648 "representable size.\n");
649 break;
650 case arg_too_small:
651 case arg_unreadable:
652 case arg_in_range:
653 // do nothing for now
654 break;
655 default:
656 ShouldNotReachHere();
657 }
658 }
659
660 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
661 return CommandLineFlags::boolAtPut(name, &value, origin);
662 }
663
664 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
665 double v;
666 if (sscanf(value, "%lf", &v) != 1) {
667 return false;
668 }
669
670 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
671 return true;
672 }
673 return false;
674 }
675
676 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
677 julong v;
678 intx intx_v;
679 bool is_neg = false;
680 // Check the sign first since atomull() parses only unsigned values.
681 if (*value == '-') {
682 if (!CommandLineFlags::intxAt(name, &intx_v)) {
683 return false;
684 }
685 value++;
686 is_neg = true;
687 }
688 if (!atomull(value, &v)) {
689 return false;
690 }
691 intx_v = (intx) v;
692 if (is_neg) {
693 intx_v = -intx_v;
694 }
695 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
696 return true;
697 }
698 uintx uintx_v = (uintx) v;
699 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
700 return true;
701 }
702 uint64_t uint64_t_v = (uint64_t) v;
703 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
704 return true;
705 }
706 size_t size_t_v = (size_t) v;
707 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) {
708 return true;
709 }
710 return false;
711 }
712
713 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
714 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
715 // Contract: CommandLineFlags always returns a pointer that needs freeing.
716 FREE_C_HEAP_ARRAY(char, value, mtInternal);
717 return true;
718 }
719
720 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
721 const char* old_value = "";
722 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
723 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
724 size_t new_len = strlen(new_value);
725 const char* value;
726 char* free_this_too = NULL;
727 if (old_len == 0) {
728 value = new_value;
729 } else if (new_len == 0) {
730 value = old_value;
731 } else {
732 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
733 // each new setting adds another LINE to the switch:
734 sprintf(buf, "%s\n%s", old_value, new_value);
735 value = buf;
736 free_this_too = buf;
737 }
738 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
739 // CommandLineFlags always returns a pointer that needs freeing.
740 FREE_C_HEAP_ARRAY(char, value, mtInternal);
741 if (free_this_too != NULL) {
742 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
743 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
744 }
745 return true;
746 }
747
748 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
749
750 // range of acceptable characters spelled out for portability reasons
751 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
752 #define BUFLEN 255
753 char name[BUFLEN+1];
754 char dummy;
755
756 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
757 return set_bool_flag(name, false, origin);
758 }
759 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
760 return set_bool_flag(name, true, origin);
761 }
762
763 char punct;
764 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
765 const char* value = strchr(arg, '=') + 1;
766 Flag* flag = Flag::find_flag(name, strlen(name));
767 if (flag != NULL && flag->is_ccstr()) {
768 if (flag->ccstr_accumulates()) {
769 return append_to_string_flag(name, value, origin);
770 } else {
771 if (value[0] == '\0') {
772 value = NULL;
773 }
774 return set_string_flag(name, value, origin);
775 }
776 }
777 }
778
779 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
780 const char* value = strchr(arg, '=') + 1;
781 // -XX:Foo:=xxx will reset the string flag to the given value.
782 if (value[0] == '\0') {
783 value = NULL;
784 }
785 return set_string_flag(name, value, origin);
786 }
787
788 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
789 #define SIGNED_NUMBER_RANGE "[-0123456789]"
790 #define NUMBER_RANGE "[0123456789]"
791 char value[BUFLEN + 1];
792 char value2[BUFLEN + 1];
793 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
794 // Looks like a floating-point number -- try again with more lenient format string
795 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
796 return set_fp_numeric_flag(name, value, origin);
797 }
798 }
799
800 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
801 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
802 return set_numeric_flag(name, value, origin);
803 }
804
805 return false;
806 }
807
808 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
809 assert(bldarray != NULL, "illegal argument");
810
811 if (arg == NULL) {
812 return;
813 }
814
815 int new_count = *count + 1;
816
817 // expand the array and add arg to the last element
818 if (*bldarray == NULL) {
819 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
820 } else {
821 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
822 }
823 (*bldarray)[*count] = os::strdup_check_oom(arg);
824 *count = new_count;
825 }
826
827 void Arguments::build_jvm_args(const char* arg) {
828 add_string(&_jvm_args_array, &_num_jvm_args, arg);
829 }
830
831 void Arguments::build_jvm_flags(const char* arg) {
832 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
833 }
834
835 // utility function to return a string that concatenates all
836 // strings in a given char** array
837 const char* Arguments::build_resource_string(char** args, int count) {
838 if (args == NULL || count == 0) {
839 return NULL;
840 }
841 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
842 for (int i = 1; i < count; i++) {
843 length += strlen(args[i]) + 1; // add 1 for a space
844 }
845 char* s = NEW_RESOURCE_ARRAY(char, length);
846 strcpy(s, args[0]);
847 for (int j = 1; j < count; j++) {
848 strcat(s, " ");
849 strcat(s, args[j]);
850 }
851 return (const char*) s;
852 }
853
854 void Arguments::print_on(outputStream* st) {
855 st->print_cr("VM Arguments:");
856 if (num_jvm_flags() > 0) {
857 st->print("jvm_flags: "); print_jvm_flags_on(st);
858 }
859 if (num_jvm_args() > 0) {
860 st->print("jvm_args: "); print_jvm_args_on(st);
861 }
862 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
863 if (_java_class_path != NULL) {
864 char* path = _java_class_path->value();
865 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
866 }
867 st->print_cr("Launcher Type: %s", _sun_java_launcher);
868 }
869
870 void Arguments::print_jvm_flags_on(outputStream* st) {
871 if (_num_jvm_flags > 0) {
872 for (int i=0; i < _num_jvm_flags; i++) {
873 st->print("%s ", _jvm_flags_array[i]);
874 }
875 st->cr();
876 }
877 }
878
879 void Arguments::print_jvm_args_on(outputStream* st) {
880 if (_num_jvm_args > 0) {
881 for (int i=0; i < _num_jvm_args; i++) {
882 st->print("%s ", _jvm_args_array[i]);
883 }
884 st->cr();
885 }
886 }
887
888 bool Arguments::process_argument(const char* arg,
889 jboolean ignore_unrecognized, Flag::Flags origin) {
890
891 JDK_Version since = JDK_Version();
892
893 if (parse_argument(arg, origin) || ignore_unrecognized) {
894 return true;
895 }
896
897 bool has_plus_minus = (*arg == '+' || *arg == '-');
898 const char* const argname = has_plus_minus ? arg + 1 : arg;
899 if (is_newly_obsolete(arg, &since)) {
900 char version[256];
901 since.to_string(version, sizeof(version));
902 warning("ignoring option %s; support was removed in %s", argname, version);
903 return true;
904 }
905
906 // For locked flags, report a custom error message if available.
907 // Otherwise, report the standard unrecognized VM option.
908
909 size_t arg_len;
910 const char* equal_sign = strchr(argname, '=');
911 if (equal_sign == NULL) {
912 arg_len = strlen(argname);
913 } else {
914 arg_len = equal_sign - argname;
915 }
916
917 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
918 if (found_flag != NULL) {
919 char locked_message_buf[BUFLEN];
920 found_flag->get_locked_message(locked_message_buf, BUFLEN);
921 if (strlen(locked_message_buf) == 0) {
922 if (found_flag->is_bool() && !has_plus_minus) {
923 jio_fprintf(defaultStream::error_stream(),
924 "Missing +/- setting for VM option '%s'\n", argname);
925 } else if (!found_flag->is_bool() && has_plus_minus) {
926 jio_fprintf(defaultStream::error_stream(),
927 "Unexpected +/- setting in VM option '%s'\n", argname);
928 } else {
929 jio_fprintf(defaultStream::error_stream(),
930 "Improperly specified VM option '%s'\n", argname);
931 }
932 } else {
933 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
934 }
935 } else {
936 jio_fprintf(defaultStream::error_stream(),
937 "Unrecognized VM option '%s'\n", argname);
938 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
939 if (fuzzy_matched != NULL) {
940 jio_fprintf(defaultStream::error_stream(),
941 "Did you mean '%s%s%s'? ",
942 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
943 fuzzy_matched->_name,
944 (fuzzy_matched->is_bool()) ? "" : "=<value>");
945 if (is_newly_obsolete(fuzzy_matched->_name, &since)){
946 char version[256];
947 since.to_string(version, sizeof(version));
948 jio_fprintf(defaultStream::error_stream(),
949 "Warning: support for %s was removed in %s\n",
950 fuzzy_matched->_name,
951 version);
952 }
953 }
954 }
955
956 // allow for commandline "commenting out" options like -XX:#+Verbose
957 return arg[0] == '#';
958 }
959
960 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
961 FILE* stream = fopen(file_name, "rb");
962 if (stream == NULL) {
963 if (should_exist) {
964 jio_fprintf(defaultStream::error_stream(),
965 "Could not open settings file %s\n", file_name);
966 return false;
967 } else {
968 return true;
969 }
970 }
971
972 char token[1024];
973 int pos = 0;
974
975 bool in_white_space = true;
976 bool in_comment = false;
977 bool in_quote = false;
978 char quote_c = 0;
979 bool result = true;
980
981 int c = getc(stream);
982 while(c != EOF && pos < (int)(sizeof(token)-1)) {
983 if (in_white_space) {
984 if (in_comment) {
985 if (c == '\n') in_comment = false;
986 } else {
987 if (c == '#') in_comment = true;
988 else if (!isspace(c)) {
989 in_white_space = false;
990 token[pos++] = c;
991 }
992 }
993 } else {
994 if (c == '\n' || (!in_quote && isspace(c))) {
995 // token ends at newline, or at unquoted whitespace
996 // this allows a way to include spaces in string-valued options
997 token[pos] = '\0';
998 logOption(token);
999 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1000 build_jvm_flags(token);
1001 pos = 0;
1002 in_white_space = true;
1003 in_quote = false;
1004 } else if (!in_quote && (c == '\'' || c == '"')) {
1005 in_quote = true;
1006 quote_c = c;
1007 } else if (in_quote && (c == quote_c)) {
1008 in_quote = false;
1009 } else {
1010 token[pos++] = c;
1011 }
1012 }
1013 c = getc(stream);
1014 }
1015 if (pos > 0) {
1016 token[pos] = '\0';
1017 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1018 build_jvm_flags(token);
1019 }
1020 fclose(stream);
1021 return result;
1022 }
1023
1024 //=============================================================================================================
1025 // Parsing of properties (-D)
1026
1027 const char* Arguments::get_property(const char* key) {
1028 return PropertyList_get_value(system_properties(), key);
1029 }
1030
1031 bool Arguments::add_property(const char* prop) {
1032 const char* eq = strchr(prop, '=');
1033 char* key;
1034 // ns must be static--its address may be stored in a SystemProperty object.
1035 const static char ns[1] = {0};
1036 char* value = (char *)ns;
1037
1038 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1039 key = AllocateHeap(key_len + 1, mtInternal);
1040 strncpy(key, prop, key_len);
1041 key[key_len] = '\0';
1042
1043 if (eq != NULL) {
1044 size_t value_len = strlen(prop) - key_len - 1;
1045 value = AllocateHeap(value_len + 1, mtInternal);
1046 strncpy(value, &prop[key_len + 1], value_len + 1);
1047 }
1048
1049 if (strcmp(key, "java.compiler") == 0) {
1050 process_java_compiler_argument(value);
1051 FreeHeap(key);
1052 if (eq != NULL) {
1053 FreeHeap(value);
1054 }
1055 return true;
1056 } else if (strcmp(key, "sun.java.command") == 0) {
1057 _java_command = value;
1058
1059 // Record value in Arguments, but let it get passed to Java.
1060 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1061 strcmp(key, "sun.java.launcher.pid") == 0) {
1062 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1063 // private and are processed in process_sun_java_launcher_properties();
1064 // the sun.java.launcher property is passed on to the java application
1065 FreeHeap(key);
1066 if (eq != NULL) {
1067 FreeHeap(value);
1068 }
1069 return true;
1070 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1071 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1072 // its value without going through the property list or making a Java call.
1073 _java_vendor_url_bug = value;
1074 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1075 PropertyList_unique_add(&_system_properties, key, value, true);
1076 return true;
1077 }
1078 // Create new property and add at the end of the list
1079 PropertyList_unique_add(&_system_properties, key, value);
1080 return true;
1081 }
1082
1083 //===========================================================================================================
1084 // Setting int/mixed/comp mode flags
1085
1086 void Arguments::set_mode_flags(Mode mode) {
1087 // Set up default values for all flags.
1088 // If you add a flag to any of the branches below,
1089 // add a default value for it here.
1090 set_java_compiler(false);
1091 _mode = mode;
1092
1093 // Ensure Agent_OnLoad has the correct initial values.
1094 // This may not be the final mode; mode may change later in onload phase.
1095 PropertyList_unique_add(&_system_properties, "java.vm.info",
1096 (char*)VM_Version::vm_info_string(), false);
1097
1098 UseInterpreter = true;
1099 UseCompiler = true;
1100 UseLoopCounter = true;
1101
1102 // Default values may be platform/compiler dependent -
1103 // use the saved values
1104 ClipInlining = Arguments::_ClipInlining;
1105 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1106 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1107 BackgroundCompilation = Arguments::_BackgroundCompilation;
1108
1109 // Change from defaults based on mode
1110 switch (mode) {
1111 default:
1112 ShouldNotReachHere();
1113 break;
1114 case _int:
1115 UseCompiler = false;
1116 UseLoopCounter = false;
1117 AlwaysCompileLoopMethods = false;
1118 UseOnStackReplacement = false;
1119 break;
1120 case _mixed:
1121 // same as default
1122 break;
1123 case _comp:
1124 UseInterpreter = false;
1125 BackgroundCompilation = false;
1126 ClipInlining = false;
1127 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1128 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1129 // compile a level 4 (C2) and then continue executing it.
1130 if (TieredCompilation) {
1131 Tier3InvokeNotifyFreqLog = 0;
1132 Tier4InvocationThreshold = 0;
1133 }
1134 break;
1135 }
1136 }
1137
1138 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1139 // Conflict: required to use shared spaces (-Xshare:on), but
1140 // incompatible command line options were chosen.
1141
1142 static void no_shared_spaces(const char* message) {
1143 if (RequireSharedSpaces) {
1144 jio_fprintf(defaultStream::error_stream(),
1145 "Class data sharing is inconsistent with other specified options.\n");
1146 vm_exit_during_initialization("Unable to use shared archive.", message);
1147 } else {
1148 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1149 }
1150 }
1151 #endif
1152
1153 // Returns threshold scaled with CompileThresholdScaling
1154 intx Arguments::get_scaled_compile_threshold(intx threshold) {
1155 return (intx)(threshold * CompileThresholdScaling);
1156 }
1157
1158 // Returns freq_log scaled with CompileThresholdScaling
1159 intx Arguments::get_scaled_freq_log(intx freq_log) {
1160 intx scaled_freq = get_scaled_compile_threshold((intx)1 << freq_log);
1161 if (scaled_freq == 0) {
1162 return 0;
1163 } else {
1164 return log2_intptr(scaled_freq);
1165 }
1166 }
1167
1168 void Arguments::set_tiered_flags() {
1169 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1170 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1171 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1172 }
1173 if (CompilationPolicyChoice < 2) {
1174 vm_exit_during_initialization(
1175 "Incompatible compilation policy selected", NULL);
1176 }
1177 // Increase the code cache size - tiered compiles a lot more.
1178 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1179 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1180 }
1181 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1182 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1183 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1184
1185 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1186 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1187 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1188 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1189 }
1190 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1191 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1192 }
1193 // Check consistency of code heap sizes
1194 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1195 jio_fprintf(defaultStream::error_stream(),
1196 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1197 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1198 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1199 vm_exit(1);
1200 }
1201 }
1202 }
1203 if (!UseInterpreter) { // -Xcomp
1204 Tier3InvokeNotifyFreqLog = 0;
1205 Tier4InvocationThreshold = 0;
1206 }
1207 // Scale tiered compilation thresholds
1208 if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) {
1209 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, get_scaled_freq_log(Tier0InvokeNotifyFreqLog));
1210 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, get_scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1211
1212 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, get_scaled_compile_threshold(Tier3InvocationThreshold));
1213 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, get_scaled_compile_threshold(Tier3MinInvocationThreshold));
1214 FLAG_SET_ERGO(intx, Tier3CompileThreshold, get_scaled_compile_threshold(Tier3CompileThreshold));
1215 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, get_scaled_compile_threshold(Tier3BackEdgeThreshold));
1216
1217 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1218 // once these thresholds become supported.
1219
1220 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, get_scaled_freq_log(Tier2InvokeNotifyFreqLog));
1221 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, get_scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1222
1223 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, get_scaled_freq_log(Tier3InvokeNotifyFreqLog));
1224 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, get_scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1225
1226 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, get_scaled_freq_log(Tier23InlineeNotifyFreqLog));
1227
1228 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, get_scaled_compile_threshold(Tier4InvocationThreshold));
1229 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, get_scaled_compile_threshold(Tier4MinInvocationThreshold));
1230 FLAG_SET_ERGO(intx, Tier4CompileThreshold, get_scaled_compile_threshold(Tier4CompileThreshold));
1231 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, get_scaled_compile_threshold(Tier4BackEdgeThreshold));
1232 }
1233 }
1234
1235 /**
1236 * Returns the minimum number of compiler threads needed to run the JVM. The following
1237 * configurations are possible.
1238 *
1239 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1240 * compiler threads is 0.
1241 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1242 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1243 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1244 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1245 * C1 can be used, so the minimum number of compiler threads is 1.
1246 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1247 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1248 * the minimum number of compiler threads is 2.
1249 */
1250 int Arguments::get_min_number_of_compiler_threads() {
1251 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1252 return 0; // case 1
1253 #else
1254 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1255 return 1; // case 2 or case 3
1256 }
1257 return 2; // case 4 (tiered)
1258 #endif
1259 }
1260
1261 #if INCLUDE_ALL_GCS
1262 static void disable_adaptive_size_policy(const char* collector_name) {
1263 if (UseAdaptiveSizePolicy) {
1264 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1265 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1266 collector_name);
1267 }
1268 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1269 }
1270 }
1271
1272 void Arguments::set_parnew_gc_flags() {
1273 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1274 "control point invariant");
1275 assert(UseParNewGC, "Error");
1276
1277 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1278 disable_adaptive_size_policy("UseParNewGC");
1279
1280 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1281 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1282 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1283 } else if (ParallelGCThreads == 0) {
1284 jio_fprintf(defaultStream::error_stream(),
1285 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1286 vm_exit(1);
1287 }
1288
1289 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1290 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1291 // we set them to 1024 and 1024.
1292 // See CR 6362902.
1293 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1294 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1295 }
1296 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1297 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1298 }
1299
1300 // When using compressed oops, we use local overflow stacks,
1301 // rather than using a global overflow list chained through
1302 // the klass word of the object's pre-image.
1303 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1304 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1305 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1306 }
1307 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1308 }
1309 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1310 }
1311
1312 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1313 // sparc/solaris for certain applications, but would gain from
1314 // further optimization and tuning efforts, and would almost
1315 // certainly gain from analysis of platform and environment.
1316 void Arguments::set_cms_and_parnew_gc_flags() {
1317 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1318 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1319
1320 // If we are using CMS, we prefer to UseParNewGC,
1321 // unless explicitly forbidden.
1322 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1323 FLAG_SET_ERGO(bool, UseParNewGC, true);
1324 }
1325
1326 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1327 disable_adaptive_size_policy("UseConcMarkSweepGC");
1328
1329 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1330 // as needed.
1331 if (UseParNewGC) {
1332 set_parnew_gc_flags();
1333 }
1334
1335 size_t max_heap = align_size_down(MaxHeapSize,
1336 CardTableRS::ct_max_alignment_constraint());
1337
1338 // Now make adjustments for CMS
1339 intx tenuring_default = (intx)6;
1340 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1341
1342 // Preferred young gen size for "short" pauses:
1343 // upper bound depends on # of threads and NewRatio.
1344 const uintx parallel_gc_threads =
1345 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1346 const size_t preferred_max_new_size_unaligned =
1347 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1348 size_t preferred_max_new_size =
1349 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1350
1351 // Unless explicitly requested otherwise, size young gen
1352 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1353
1354 // If either MaxNewSize or NewRatio is set on the command line,
1355 // assume the user is trying to set the size of the young gen.
1356 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1357
1358 // Set MaxNewSize to our calculated preferred_max_new_size unless
1359 // NewSize was set on the command line and it is larger than
1360 // preferred_max_new_size.
1361 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1362 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1363 } else {
1364 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1365 }
1366 if (PrintGCDetails && Verbose) {
1367 // Too early to use gclog_or_tty
1368 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1369 }
1370
1371 // Code along this path potentially sets NewSize and OldSize
1372 if (PrintGCDetails && Verbose) {
1373 // Too early to use gclog_or_tty
1374 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1375 " initial_heap_size: " SIZE_FORMAT
1376 " max_heap: " SIZE_FORMAT,
1377 min_heap_size(), InitialHeapSize, max_heap);
1378 }
1379 size_t min_new = preferred_max_new_size;
1380 if (FLAG_IS_CMDLINE(NewSize)) {
1381 min_new = NewSize;
1382 }
1383 if (max_heap > min_new && min_heap_size() > min_new) {
1384 // Unless explicitly requested otherwise, make young gen
1385 // at least min_new, and at most preferred_max_new_size.
1386 if (FLAG_IS_DEFAULT(NewSize)) {
1387 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1388 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1389 if (PrintGCDetails && Verbose) {
1390 // Too early to use gclog_or_tty
1391 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1392 }
1393 }
1394 // Unless explicitly requested otherwise, size old gen
1395 // so it's NewRatio x of NewSize.
1396 if (FLAG_IS_DEFAULT(OldSize)) {
1397 if (max_heap > NewSize) {
1398 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1399 if (PrintGCDetails && Verbose) {
1400 // Too early to use gclog_or_tty
1401 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1402 }
1403 }
1404 }
1405 }
1406 }
1407 // Unless explicitly requested otherwise, definitely
1408 // promote all objects surviving "tenuring_default" scavenges.
1409 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1410 FLAG_IS_DEFAULT(SurvivorRatio)) {
1411 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1412 }
1413 // If we decided above (or user explicitly requested)
1414 // `promote all' (via MaxTenuringThreshold := 0),
1415 // prefer minuscule survivor spaces so as not to waste
1416 // space for (non-existent) survivors
1417 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1418 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1419 }
1420 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1421 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1422 // This is done in order to make ParNew+CMS configuration to work
1423 // with YoungPLABSize and OldPLABSize options.
1424 // See CR 6362902.
1425 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1426 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1427 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1428 // is. In this situation let CMSParPromoteBlocksToClaim follow
1429 // the value (either from the command line or ergonomics) of
1430 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1431 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1432 } else {
1433 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1434 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1435 // we'll let it to take precedence.
1436 jio_fprintf(defaultStream::error_stream(),
1437 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1438 " options are specified for the CMS collector."
1439 " CMSParPromoteBlocksToClaim will take precedence.\n");
1440 }
1441 }
1442 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1443 // OldPLAB sizing manually turned off: Use a larger default setting,
1444 // unless it was manually specified. This is because a too-low value
1445 // will slow down scavenges.
1446 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1447 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1448 }
1449 }
1450 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1451 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1452 // If either of the static initialization defaults have changed, note this
1453 // modification.
1454 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1455 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1456 }
1457 if (PrintGCDetails && Verbose) {
1458 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1459 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1460 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1461 }
1462 }
1463 #endif // INCLUDE_ALL_GCS
1464
1465 void set_object_alignment() {
1466 // Object alignment.
1467 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1468 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1469 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1470 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1471 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1472 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1473
1474 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1475 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1476
1477 // Oop encoding heap max
1478 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1479
1480 #if INCLUDE_ALL_GCS
1481 // Set CMS global values
1482 CompactibleFreeListSpace::set_cms_values();
1483 #endif // INCLUDE_ALL_GCS
1484 }
1485
1486 bool verify_object_alignment() {
1487 // Object alignment.
1488 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1489 jio_fprintf(defaultStream::error_stream(),
1490 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1491 (int)ObjectAlignmentInBytes);
1492 return false;
1493 }
1494 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1495 jio_fprintf(defaultStream::error_stream(),
1496 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1497 (int)ObjectAlignmentInBytes, BytesPerLong);
1498 return false;
1499 }
1500 // It does not make sense to have big object alignment
1501 // since a space lost due to alignment will be greater
1502 // then a saved space from compressed oops.
1503 if ((int)ObjectAlignmentInBytes > 256) {
1504 jio_fprintf(defaultStream::error_stream(),
1505 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1506 (int)ObjectAlignmentInBytes);
1507 return false;
1508 }
1509 // In case page size is very small.
1510 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1511 jio_fprintf(defaultStream::error_stream(),
1512 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1513 (int)ObjectAlignmentInBytes, os::vm_page_size());
1514 return false;
1515 }
1516 if(SurvivorAlignmentInBytes == 0) {
1517 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1518 } else {
1519 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1520 jio_fprintf(defaultStream::error_stream(),
1521 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1522 (int)SurvivorAlignmentInBytes);
1523 return false;
1524 }
1525 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1526 jio_fprintf(defaultStream::error_stream(),
1527 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1528 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1529 return false;
1530 }
1531 }
1532 return true;
1533 }
1534
1535 size_t Arguments::max_heap_for_compressed_oops() {
1536 // Avoid sign flip.
1537 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1538 // We need to fit both the NULL page and the heap into the memory budget, while
1539 // keeping alignment constraints of the heap. To guarantee the latter, as the
1540 // NULL page is located before the heap, we pad the NULL page to the conservative
1541 // maximum alignment that the GC may ever impose upon the heap.
1542 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1543 _conservative_max_heap_alignment);
1544
1545 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1546 NOT_LP64(ShouldNotReachHere(); return 0);
1547 }
1548
1549 bool Arguments::should_auto_select_low_pause_collector() {
1550 if (UseAutoGCSelectPolicy &&
1551 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1552 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1553 if (PrintGCDetails) {
1554 // Cannot use gclog_or_tty yet.
1555 tty->print_cr("Automatic selection of the low pause collector"
1556 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1557 }
1558 return true;
1559 }
1560 return false;
1561 }
1562
1563 void Arguments::set_use_compressed_oops() {
1564 #ifndef ZERO
1565 #ifdef _LP64
1566 // MaxHeapSize is not set up properly at this point, but
1567 // the only value that can override MaxHeapSize if we are
1568 // to use UseCompressedOops is InitialHeapSize.
1569 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1570
1571 if (max_heap_size <= max_heap_for_compressed_oops()) {
1572 #if !defined(COMPILER1) || defined(TIERED)
1573 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1574 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1575 }
1576 #endif
1577 #ifdef _WIN64
1578 if (UseLargePages && UseCompressedOops) {
1579 // Cannot allocate guard pages for implicit checks in indexed addressing
1580 // mode, when large pages are specified on windows.
1581 // This flag could be switched ON if narrow oop base address is set to 0,
1582 // see code in Universe::initialize_heap().
1583 Universe::set_narrow_oop_use_implicit_null_checks(false);
1584 }
1585 #endif // _WIN64
1586 } else {
1587 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1588 warning("Max heap size too large for Compressed Oops");
1589 FLAG_SET_DEFAULT(UseCompressedOops, false);
1590 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1591 }
1592 }
1593 #endif // _LP64
1594 #endif // ZERO
1595 }
1596
1597
1598 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1599 // set_use_compressed_oops().
1600 void Arguments::set_use_compressed_klass_ptrs() {
1601 #ifndef ZERO
1602 #ifdef _LP64
1603 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1604 if (!UseCompressedOops) {
1605 if (UseCompressedClassPointers) {
1606 warning("UseCompressedClassPointers requires UseCompressedOops");
1607 }
1608 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1609 } else {
1610 // Turn on UseCompressedClassPointers too
1611 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1612 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1613 }
1614 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1615 if (UseCompressedClassPointers) {
1616 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1617 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1618 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1619 }
1620 }
1621 }
1622 #endif // _LP64
1623 #endif // !ZERO
1624 }
1625
1626 void Arguments::set_conservative_max_heap_alignment() {
1627 // The conservative maximum required alignment for the heap is the maximum of
1628 // the alignments imposed by several sources: any requirements from the heap
1629 // itself, the collector policy and the maximum page size we may run the VM
1630 // with.
1631 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1632 #if INCLUDE_ALL_GCS
1633 if (UseParallelGC) {
1634 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1635 } else if (UseG1GC) {
1636 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1637 }
1638 #endif // INCLUDE_ALL_GCS
1639 _conservative_max_heap_alignment = MAX4(heap_alignment,
1640 (size_t)os::vm_allocation_granularity(),
1641 os::max_page_size(),
1642 CollectorPolicy::compute_heap_alignment());
1643 }
1644
1645 void Arguments::select_gc_ergonomically() {
1646 if (os::is_server_class_machine()) {
1647 if (should_auto_select_low_pause_collector()) {
1648 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1649 } else {
1650 FLAG_SET_ERGO(bool, UseParallelGC, true);
1651 }
1652 }
1653 }
1654
1655 void Arguments::select_gc() {
1656 if (!gc_selected()) {
1657 ArgumentsExt::select_gc_ergonomically();
1658 }
1659 }
1660
1661 void Arguments::set_ergonomics_flags() {
1662 select_gc();
1663
1664 #ifdef COMPILER2
1665 // Shared spaces work fine with other GCs but causes bytecode rewriting
1666 // to be disabled, which hurts interpreter performance and decreases
1667 // server performance. When -server is specified, keep the default off
1668 // unless it is asked for. Future work: either add bytecode rewriting
1669 // at link time, or rewrite bytecodes in non-shared methods.
1670 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1671 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1672 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1673 }
1674 #endif
1675
1676 set_conservative_max_heap_alignment();
1677
1678 #ifndef ZERO
1679 #ifdef _LP64
1680 set_use_compressed_oops();
1681
1682 // set_use_compressed_klass_ptrs() must be called after calling
1683 // set_use_compressed_oops().
1684 set_use_compressed_klass_ptrs();
1685
1686 // Also checks that certain machines are slower with compressed oops
1687 // in vm_version initialization code.
1688 #endif // _LP64
1689 #endif // !ZERO
1690 }
1691
1692 void Arguments::set_parallel_gc_flags() {
1693 assert(UseParallelGC || UseParallelOldGC, "Error");
1694 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1695 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1696 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1697 }
1698 FLAG_SET_DEFAULT(UseParallelGC, true);
1699
1700 // If no heap maximum was requested explicitly, use some reasonable fraction
1701 // of the physical memory, up to a maximum of 1GB.
1702 FLAG_SET_DEFAULT(ParallelGCThreads,
1703 Abstract_VM_Version::parallel_worker_threads());
1704 if (ParallelGCThreads == 0) {
1705 jio_fprintf(defaultStream::error_stream(),
1706 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1707 vm_exit(1);
1708 }
1709
1710 if (UseAdaptiveSizePolicy) {
1711 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1712 // unless the user actually sets these flags.
1713 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1714 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1715 _min_heap_free_ratio = MinHeapFreeRatio;
1716 }
1717 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1718 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1719 _max_heap_free_ratio = MaxHeapFreeRatio;
1720 }
1721 }
1722
1723 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1724 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1725 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1726 // See CR 6362902 for details.
1727 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1728 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1729 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1730 }
1731 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1732 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1733 }
1734 }
1735
1736 if (UseParallelOldGC) {
1737 // Par compact uses lower default values since they are treated as
1738 // minimums. These are different defaults because of the different
1739 // interpretation and are not ergonomically set.
1740 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1741 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1742 }
1743 }
1744 }
1745
1746 void Arguments::set_g1_gc_flags() {
1747 assert(UseG1GC, "Error");
1748 #ifdef COMPILER1
1749 FastTLABRefill = false;
1750 #endif
1751 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1752 if (ParallelGCThreads == 0) {
1753 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1754 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1755 }
1756
1757 #if INCLUDE_ALL_GCS
1758 if (G1ConcRefinementThreads == 0) {
1759 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1760 }
1761 #endif
1762
1763 // MarkStackSize will be set (if it hasn't been set by the user)
1764 // when concurrent marking is initialized.
1765 // Its value will be based upon the number of parallel marking threads.
1766 // But we do set the maximum mark stack size here.
1767 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1768 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1769 }
1770
1771 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1772 // In G1, we want the default GC overhead goal to be higher than
1773 // say in PS. So we set it here to 10%. Otherwise the heap might
1774 // be expanded more aggressively than we would like it to. In
1775 // fact, even 10% seems to not be high enough in some cases
1776 // (especially small GC stress tests that the main thing they do
1777 // is allocation). We might consider increase it further.
1778 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1779 }
1780
1781 if (PrintGCDetails && Verbose) {
1782 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1783 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1784 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1785 }
1786 }
1787
1788 #if !INCLUDE_ALL_GCS
1789 #ifdef ASSERT
1790 static bool verify_serial_gc_flags() {
1791 return (UseSerialGC &&
1792 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1793 UseParallelGC || UseParallelOldGC));
1794 }
1795 #endif // ASSERT
1796 #endif // INCLUDE_ALL_GCS
1797
1798 void Arguments::set_gc_specific_flags() {
1799 #if INCLUDE_ALL_GCS
1800 // Set per-collector flags
1801 if (UseParallelGC || UseParallelOldGC) {
1802 set_parallel_gc_flags();
1803 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
1804 set_cms_and_parnew_gc_flags();
1805 } else if (UseParNewGC) { // Skipped if CMS is set above
1806 set_parnew_gc_flags();
1807 } else if (UseG1GC) {
1808 set_g1_gc_flags();
1809 }
1810 check_deprecated_gcs();
1811 check_deprecated_gc_flags();
1812 if (AssumeMP && !UseSerialGC) {
1813 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1814 warning("If the number of processors is expected to increase from one, then"
1815 " you should configure the number of parallel GC threads appropriately"
1816 " using -XX:ParallelGCThreads=N");
1817 }
1818 }
1819 if (MinHeapFreeRatio == 100) {
1820 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1821 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1822 }
1823 #else // INCLUDE_ALL_GCS
1824 assert(verify_serial_gc_flags(), "SerialGC unset");
1825 #endif // INCLUDE_ALL_GCS
1826 }
1827
1828 julong Arguments::limit_by_allocatable_memory(julong limit) {
1829 julong max_allocatable;
1830 julong result = limit;
1831 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1832 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1833 }
1834 return result;
1835 }
1836
1837 // Use static initialization to get the default before parsing
1838 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1839
1840 void Arguments::set_heap_size() {
1841 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1842 // Deprecated flag
1843 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1844 }
1845
1846 const julong phys_mem =
1847 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1848 : (julong)MaxRAM;
1849
1850 // If the maximum heap size has not been set with -Xmx,
1851 // then set it as fraction of the size of physical memory,
1852 // respecting the maximum and minimum sizes of the heap.
1853 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1854 julong reasonable_max = phys_mem / MaxRAMFraction;
1855
1856 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1857 // Small physical memory, so use a minimum fraction of it for the heap
1858 reasonable_max = phys_mem / MinRAMFraction;
1859 } else {
1860 // Not-small physical memory, so require a heap at least
1861 // as large as MaxHeapSize
1862 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1863 }
1864 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1865 // Limit the heap size to ErgoHeapSizeLimit
1866 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1867 }
1868 if (UseCompressedOops) {
1869 // Limit the heap size to the maximum possible when using compressed oops
1870 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1871
1872 // HeapBaseMinAddress can be greater than default but not less than.
1873 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1874 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1875 // matches compressed oops printing flags
1876 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1877 jio_fprintf(defaultStream::error_stream(),
1878 "HeapBaseMinAddress must be at least " UINTX_FORMAT
1879 " (" UINTX_FORMAT "G) which is greater than value given "
1880 UINTX_FORMAT "\n",
1881 DefaultHeapBaseMinAddress,
1882 DefaultHeapBaseMinAddress/G,
1883 HeapBaseMinAddress);
1884 }
1885 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1886 }
1887 }
1888
1889 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1890 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1891 // but it should be not less than default MaxHeapSize.
1892 max_coop_heap -= HeapBaseMinAddress;
1893 }
1894 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1895 }
1896 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1897
1898 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1899 // An initial heap size was specified on the command line,
1900 // so be sure that the maximum size is consistent. Done
1901 // after call to limit_by_allocatable_memory because that
1902 // method might reduce the allocation size.
1903 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1904 }
1905
1906 if (PrintGCDetails && Verbose) {
1907 // Cannot use gclog_or_tty yet.
1908 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1909 }
1910 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1911 }
1912
1913 // If the minimum or initial heap_size have not been set or requested to be set
1914 // ergonomically, set them accordingly.
1915 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1916 julong reasonable_minimum = (julong)(OldSize + NewSize);
1917
1918 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1919
1920 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1921
1922 if (InitialHeapSize == 0) {
1923 julong reasonable_initial = phys_mem / InitialRAMFraction;
1924
1925 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1926 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1927
1928 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1929
1930 if (PrintGCDetails && Verbose) {
1931 // Cannot use gclog_or_tty yet.
1932 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1933 }
1934 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1935 }
1936 // If the minimum heap size has not been set (via -Xms),
1937 // synchronize with InitialHeapSize to avoid errors with the default value.
1938 if (min_heap_size() == 0) {
1939 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1940 if (PrintGCDetails && Verbose) {
1941 // Cannot use gclog_or_tty yet.
1942 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1943 }
1944 }
1945 }
1946 }
1947
1948 // This must be called after ergonomics because we want bytecode rewriting
1949 // if the server compiler is used, or if UseSharedSpaces is disabled.
1950 void Arguments::set_bytecode_flags() {
1951 // Better not attempt to store into a read-only space.
1952 if (UseSharedSpaces) {
1953 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1954 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1955 }
1956
1957 if (!RewriteBytecodes) {
1958 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1959 }
1960 }
1961
1962 // Aggressive optimization flags -XX:+AggressiveOpts
1963 void Arguments::set_aggressive_opts_flags() {
1964 #ifdef COMPILER2
1965 if (AggressiveUnboxing) {
1966 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1967 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1968 } else if (!EliminateAutoBox) {
1969 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1970 AggressiveUnboxing = false;
1971 }
1972 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1973 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1974 } else if (!DoEscapeAnalysis) {
1975 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1976 AggressiveUnboxing = false;
1977 }
1978 }
1979 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1980 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1981 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1982 }
1983 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1984 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1985 }
1986
1987 // Feed the cache size setting into the JDK
1988 char buffer[1024];
1989 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1990 add_property(buffer);
1991 }
1992 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1993 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1994 }
1995 #endif
1996
1997 if (AggressiveOpts) {
1998 // Sample flag setting code
1999 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2000 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2001 // }
2002 }
2003 }
2004
2005 //===========================================================================================================
2006 // Parsing of java.compiler property
2007
2008 void Arguments::process_java_compiler_argument(char* arg) {
2009 // For backwards compatibility, Djava.compiler=NONE or ""
2010 // causes us to switch to -Xint mode UNLESS -Xdebug
2011 // is also specified.
2012 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2013 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2014 }
2015 }
2016
2017 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2018 _sun_java_launcher = os::strdup_check_oom(launcher);
2019 }
2020
2021 bool Arguments::created_by_java_launcher() {
2022 assert(_sun_java_launcher != NULL, "property must have value");
2023 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2024 }
2025
2026 bool Arguments::sun_java_launcher_is_altjvm() {
2027 return _sun_java_launcher_is_altjvm;
2028 }
2029
2030 //===========================================================================================================
2031 // Parsing of main arguments
2032
2033 bool Arguments::verify_interval(uintx val, uintx min,
2034 uintx max, const char* name) {
2035 // Returns true iff value is in the inclusive interval [min..max]
2036 // false, otherwise.
2037 if (val >= min && val <= max) {
2038 return true;
2039 }
2040 jio_fprintf(defaultStream::error_stream(),
2041 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
2042 " and " UINTX_FORMAT "\n",
2043 name, val, min, max);
2044 return false;
2045 }
2046
2047 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
2048 // Returns true if given value is at least specified min threshold
2049 // false, otherwise.
2050 if (val >= min ) {
2051 return true;
2052 }
2053 jio_fprintf(defaultStream::error_stream(),
2054 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
2055 name, val, min);
2056 return false;
2057 }
2058
2059 bool Arguments::verify_percentage(uintx value, const char* name) {
2060 if (is_percentage(value)) {
2061 return true;
2062 }
2063 jio_fprintf(defaultStream::error_stream(),
2064 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2065 name, value);
2066 return false;
2067 }
2068
2069 // check if do gclog rotation
2070 // +UseGCLogFileRotation is a must,
2071 // no gc log rotation when log file not supplied or
2072 // NumberOfGCLogFiles is 0
2073 void check_gclog_consistency() {
2074 if (UseGCLogFileRotation) {
2075 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2076 jio_fprintf(defaultStream::output_stream(),
2077 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2078 "where num_of_file > 0\n"
2079 "GC log rotation is turned off\n");
2080 UseGCLogFileRotation = false;
2081 }
2082 }
2083
2084 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2085 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2086 jio_fprintf(defaultStream::output_stream(),
2087 "GCLogFileSize changed to minimum 8K\n");
2088 }
2089 }
2090
2091 // This function is called for -Xloggc:<filename>, it can be used
2092 // to check if a given file name(or string) conforms to the following
2093 // specification:
2094 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2095 // %p and %t only allowed once. We only limit usage of filename not path
2096 bool is_filename_valid(const char *file_name) {
2097 const char* p = file_name;
2098 char file_sep = os::file_separator()[0];
2099 const char* cp;
2100 // skip prefix path
2101 for (cp = file_name; *cp != '\0'; cp++) {
2102 if (*cp == '/' || *cp == file_sep) {
2103 p = cp + 1;
2104 }
2105 }
2106
2107 int count_p = 0;
2108 int count_t = 0;
2109 while (*p != '\0') {
2110 if ((*p >= '0' && *p <= '9') ||
2111 (*p >= 'A' && *p <= 'Z') ||
2112 (*p >= 'a' && *p <= 'z') ||
2113 *p == '-' ||
2114 *p == '_' ||
2115 *p == '.') {
2116 p++;
2117 continue;
2118 }
2119 if (*p == '%') {
2120 if(*(p + 1) == 'p') {
2121 p += 2;
2122 count_p ++;
2123 continue;
2124 }
2125 if (*(p + 1) == 't') {
2126 p += 2;
2127 count_t ++;
2128 continue;
2129 }
2130 }
2131 return false;
2132 }
2133 return count_p < 2 && count_t < 2;
2134 }
2135
2136 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2137 if (!is_percentage(min_heap_free_ratio)) {
2138 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2139 return false;
2140 }
2141 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2142 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2143 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2144 MaxHeapFreeRatio);
2145 return false;
2146 }
2147 // This does not set the flag itself, but stores the value in a safe place for later usage.
2148 _min_heap_free_ratio = min_heap_free_ratio;
2149 return true;
2150 }
2151
2152 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2153 if (!is_percentage(max_heap_free_ratio)) {
2154 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2155 return false;
2156 }
2157 if (max_heap_free_ratio < MinHeapFreeRatio) {
2158 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2159 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2160 MinHeapFreeRatio);
2161 return false;
2162 }
2163 // This does not set the flag itself, but stores the value in a safe place for later usage.
2164 _max_heap_free_ratio = max_heap_free_ratio;
2165 return true;
2166 }
2167
2168 // Check consistency of GC selection
2169 bool Arguments::check_gc_consistency_user() {
2170 check_gclog_consistency();
2171 bool status = true;
2172 // Ensure that the user has not selected conflicting sets
2173 // of collectors. [Note: this check is merely a user convenience;
2174 // collectors over-ride each other so that only a non-conflicting
2175 // set is selected; however what the user gets is not what they
2176 // may have expected from the combination they asked for. It's
2177 // better to reduce user confusion by not allowing them to
2178 // select conflicting combinations.
2179 uint i = 0;
2180 if (UseSerialGC) i++;
2181 if (UseConcMarkSweepGC || UseParNewGC) i++;
2182 if (UseParallelGC || UseParallelOldGC) i++;
2183 if (UseG1GC) i++;
2184 if (i > 1) {
2185 jio_fprintf(defaultStream::error_stream(),
2186 "Conflicting collector combinations in option list; "
2187 "please refer to the release notes for the combinations "
2188 "allowed\n");
2189 status = false;
2190 }
2191 return status;
2192 }
2193
2194 void Arguments::check_deprecated_gcs() {
2195 if (UseConcMarkSweepGC && !UseParNewGC) {
2196 warning("Using the DefNew young collector with the CMS collector is deprecated "
2197 "and will likely be removed in a future release");
2198 }
2199
2200 if (UseParNewGC && !UseConcMarkSweepGC) {
2201 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2202 // set up UseSerialGC properly, so that can't be used in the check here.
2203 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2204 "and will likely be removed in a future release");
2205 }
2206
2207 if (CMSIncrementalMode) {
2208 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2209 }
2210 }
2211
2212 void Arguments::check_deprecated_gc_flags() {
2213 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2214 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2215 "and will likely be removed in future release");
2216 }
2217 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2218 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2219 "Use MaxRAMFraction instead.");
2220 }
2221 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2222 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2223 }
2224 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2225 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2226 }
2227 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2228 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2229 }
2230 }
2231
2232 // Check stack pages settings
2233 bool Arguments::check_stack_pages()
2234 {
2235 bool status = true;
2236 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2237 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2238 // greater stack shadow pages can't generate instruction to bang stack
2239 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2240 return status;
2241 }
2242
2243 // Check the consistency of vm_init_args
2244 bool Arguments::check_vm_args_consistency() {
2245 // Method for adding checks for flag consistency.
2246 // The intent is to warn the user of all possible conflicts,
2247 // before returning an error.
2248 // Note: Needs platform-dependent factoring.
2249 bool status = true;
2250
2251 if (TLABRefillWasteFraction == 0) {
2252 jio_fprintf(defaultStream::error_stream(),
2253 "TLABRefillWasteFraction should be a denominator, "
2254 "not " SIZE_FORMAT "\n",
2255 TLABRefillWasteFraction);
2256 status = false;
2257 }
2258
2259 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2260 "AdaptiveSizePolicyWeight");
2261 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2262
2263 // Divide by bucket size to prevent a large size from causing rollover when
2264 // calculating amount of memory needed to be allocated for the String table.
2265 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2266 (max_uintx / StringTable::bucket_size()), "StringTable size");
2267
2268 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2269 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2270
2271 {
2272 // Using "else if" below to avoid printing two error messages if min > max.
2273 // This will also prevent us from reporting both min>100 and max>100 at the
2274 // same time, but that is less annoying than printing two identical errors IMHO.
2275 FormatBuffer<80> err_msg("%s","");
2276 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2277 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2278 status = false;
2279 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2280 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2281 status = false;
2282 }
2283 }
2284
2285 // Min/MaxMetaspaceFreeRatio
2286 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2287 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2288
2289 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2290 jio_fprintf(defaultStream::error_stream(),
2291 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2292 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2293 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2294 MinMetaspaceFreeRatio,
2295 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2296 MaxMetaspaceFreeRatio);
2297 status = false;
2298 }
2299
2300 // Trying to keep 100% free is not practical
2301 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2302
2303 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2304 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2305 }
2306
2307 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2308 // Settings to encourage splitting.
2309 if (!FLAG_IS_CMDLINE(NewRatio)) {
2310 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2311 }
2312 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2313 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2314 }
2315 }
2316
2317 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2318 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2319 }
2320
2321 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2322 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2323 if (GCTimeLimit == 100) {
2324 // Turn off gc-overhead-limit-exceeded checks
2325 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2326 }
2327
2328 status = status && ArgumentsExt::check_gc_consistency_user();
2329 status = status && check_stack_pages();
2330
2331 if (CMSIncrementalMode) {
2332 if (!UseConcMarkSweepGC) {
2333 jio_fprintf(defaultStream::error_stream(),
2334 "error: invalid argument combination.\n"
2335 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2336 "selected in order\nto use CMSIncrementalMode.\n");
2337 status = false;
2338 } else {
2339 status = status && verify_percentage(CMSIncrementalDutyCycle,
2340 "CMSIncrementalDutyCycle");
2341 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2342 "CMSIncrementalDutyCycleMin");
2343 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2344 "CMSIncrementalSafetyFactor");
2345 status = status && verify_percentage(CMSIncrementalOffset,
2346 "CMSIncrementalOffset");
2347 status = status && verify_percentage(CMSExpAvgFactor,
2348 "CMSExpAvgFactor");
2349 // If it was not set on the command line, set
2350 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2351 if (CMSInitiatingOccupancyFraction < 0) {
2352 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2353 }
2354 }
2355 }
2356
2357 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2358 // insists that we hold the requisite locks so that the iteration is
2359 // MT-safe. For the verification at start-up and shut-down, we don't
2360 // yet have a good way of acquiring and releasing these locks,
2361 // which are not visible at the CollectedHeap level. We want to
2362 // be able to acquire these locks and then do the iteration rather
2363 // than just disable the lock verification. This will be fixed under
2364 // bug 4788986.
2365 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2366 if (VerifyDuringStartup) {
2367 warning("Heap verification at start-up disabled "
2368 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2369 VerifyDuringStartup = false; // Disable verification at start-up
2370 }
2371
2372 if (VerifyBeforeExit) {
2373 warning("Heap verification at shutdown disabled "
2374 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2375 VerifyBeforeExit = false; // Disable verification at shutdown
2376 }
2377 }
2378
2379 // Note: only executed in non-PRODUCT mode
2380 if (!UseAsyncConcMarkSweepGC &&
2381 (ExplicitGCInvokesConcurrent ||
2382 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2383 jio_fprintf(defaultStream::error_stream(),
2384 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2385 " with -UseAsyncConcMarkSweepGC");
2386 status = false;
2387 }
2388
2389 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2390
2391 #if INCLUDE_ALL_GCS
2392 if (UseG1GC) {
2393 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2394 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2395 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2396
2397 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2398 "InitiatingHeapOccupancyPercent");
2399 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2400 "G1RefProcDrainInterval");
2401 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2402 "G1ConcMarkStepDurationMillis");
2403 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2404 "G1ConcRSHotCardLimit");
2405 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2406 "G1ConcRSLogCacheSize");
2407 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2408 "StringDeduplicationAgeThreshold");
2409 }
2410 if (UseConcMarkSweepGC) {
2411 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2412 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2413 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2414 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2415
2416 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2417
2418 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2419 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2420 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2421
2422 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2423
2424 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2425 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2426
2427 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2428 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2429 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2430
2431 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2432
2433 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2434
2435 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2436 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2437 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2438 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2439 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2440 }
2441
2442 if (UseParallelGC || UseParallelOldGC) {
2443 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2444 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2445
2446 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2447 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2448
2449 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2450 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2451
2452 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2453
2454 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2455 }
2456 #endif // INCLUDE_ALL_GCS
2457
2458 status = status && verify_interval(RefDiscoveryPolicy,
2459 ReferenceProcessor::DiscoveryPolicyMin,
2460 ReferenceProcessor::DiscoveryPolicyMax,
2461 "RefDiscoveryPolicy");
2462
2463 // Limit the lower bound of this flag to 1 as it is used in a division
2464 // expression.
2465 status = status && verify_interval(TLABWasteTargetPercent,
2466 1, 100, "TLABWasteTargetPercent");
2467
2468 status = status && verify_object_alignment();
2469
2470 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2471 "CompressedClassSpaceSize");
2472
2473 status = status && verify_interval(MarkStackSizeMax,
2474 1, (max_jint - 1), "MarkStackSizeMax");
2475 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2476
2477 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2478
2479 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2480
2481 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2482
2483 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2484 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2485
2486 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2487
2488 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2489 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2490 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2491 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2492
2493 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2494 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2495
2496 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2497 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2498 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2499
2500 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2501 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2502
2503 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2504 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2505 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2506 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2507
2508 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2509 #ifdef COMPILER1
2510 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2511 #endif
2512
2513 if (PrintNMTStatistics) {
2514 #if INCLUDE_NMT
2515 if (MemTracker::tracking_level() == NMT_off) {
2516 #endif // INCLUDE_NMT
2517 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2518 PrintNMTStatistics = false;
2519 #if INCLUDE_NMT
2520 }
2521 #endif
2522 }
2523
2524 // Need to limit the extent of the padding to reasonable size.
2525 // 8K is well beyond the reasonable HW cache line size, even with the
2526 // aggressive prefetching, while still leaving the room for segregating
2527 // among the distinct pages.
2528 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2529 jio_fprintf(defaultStream::error_stream(),
2530 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2531 ContendedPaddingWidth, 0, 8192);
2532 status = false;
2533 }
2534
2535 // Need to enforce the padding not to break the existing field alignments.
2536 // It is sufficient to check against the largest type size.
2537 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2538 jio_fprintf(defaultStream::error_stream(),
2539 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2540 ContendedPaddingWidth, BytesPerLong);
2541 status = false;
2542 }
2543
2544 // Check lower bounds of the code cache
2545 // Template Interpreter code is approximately 3X larger in debug builds.
2546 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2547 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2548 jio_fprintf(defaultStream::error_stream(),
2549 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2550 os::vm_page_size()/K);
2551 status = false;
2552 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2553 jio_fprintf(defaultStream::error_stream(),
2554 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2555 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2556 status = false;
2557 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2558 jio_fprintf(defaultStream::error_stream(),
2559 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2560 min_code_cache_size/K);
2561 status = false;
2562 } else if (ReservedCodeCacheSize > 2*G) {
2563 // Code cache size larger than MAXINT is not supported.
2564 jio_fprintf(defaultStream::error_stream(),
2565 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2566 (2*G)/M);
2567 status = false;
2568 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2569 jio_fprintf(defaultStream::error_stream(),
2570 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2571 min_code_cache_size/K);
2572 status = false;
2573 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2574 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2575 jio_fprintf(defaultStream::error_stream(),
2576 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2577 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2578 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2579 status = false;
2580 }
2581
2582 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2583 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2584 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2585 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt");
2586
2587
2588 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2589 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2590 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2591 // Check the minimum number of compiler threads
2592 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2593
2594 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2595 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2596 }
2597
2598 return status;
2599 }
2600
2601 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2602 const char* option_type) {
2603 if (ignore) return false;
2604
2605 const char* spacer = " ";
2606 if (option_type == NULL) {
2607 option_type = ++spacer; // Set both to the empty string.
2608 }
2609
2610 if (os::obsolete_option(option)) {
2611 jio_fprintf(defaultStream::error_stream(),
2612 "Obsolete %s%soption: %s\n", option_type, spacer,
2613 option->optionString);
2614 return false;
2615 } else {
2616 jio_fprintf(defaultStream::error_stream(),
2617 "Unrecognized %s%soption: %s\n", option_type, spacer,
2618 option->optionString);
2619 return true;
2620 }
2621 }
2622
2623 static const char* user_assertion_options[] = {
2624 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2625 };
2626
2627 static const char* system_assertion_options[] = {
2628 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2629 };
2630
2631 // Return true if any of the strings in null-terminated array 'names' matches.
2632 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2633 // the option must match exactly.
2634 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2635 bool tail_allowed) {
2636 for (/* empty */; *names != NULL; ++names) {
2637 if (match_option(option, *names, tail)) {
2638 if (**tail == '\0' || tail_allowed && **tail == ':') {
2639 return true;
2640 }
2641 }
2642 }
2643 return false;
2644 }
2645
2646 bool Arguments::parse_uintx(const char* value,
2647 uintx* uintx_arg,
2648 uintx min_size) {
2649
2650 // Check the sign first since atomull() parses only unsigned values.
2651 bool value_is_positive = !(*value == '-');
2652
2653 if (value_is_positive) {
2654 julong n;
2655 bool good_return = atomull(value, &n);
2656 if (good_return) {
2657 bool above_minimum = n >= min_size;
2658 bool value_is_too_large = n > max_uintx;
2659
2660 if (above_minimum && !value_is_too_large) {
2661 *uintx_arg = n;
2662 return true;
2663 }
2664 }
2665 }
2666 return false;
2667 }
2668
2669 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2670 julong* long_arg,
2671 julong min_size) {
2672 if (!atomull(s, long_arg)) return arg_unreadable;
2673 return check_memory_size(*long_arg, min_size);
2674 }
2675
2676 // Parse JavaVMInitArgs structure
2677
2678 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2679 // For components of the system classpath.
2680 SysClassPath scp(Arguments::get_sysclasspath());
2681 bool scp_assembly_required = false;
2682
2683 // Save default settings for some mode flags
2684 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2685 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2686 Arguments::_ClipInlining = ClipInlining;
2687 Arguments::_BackgroundCompilation = BackgroundCompilation;
2688
2689 // Setup flags for mixed which is the default
2690 set_mode_flags(_mixed);
2691
2692 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2693 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2694 if (result != JNI_OK) {
2695 return result;
2696 }
2697
2698 // Parse JavaVMInitArgs structure passed in
2699 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2700 if (result != JNI_OK) {
2701 return result;
2702 }
2703
2704 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2705 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2706 if (result != JNI_OK) {
2707 return result;
2708 }
2709
2710 // Do final processing now that all arguments have been parsed
2711 result = finalize_vm_init_args(&scp, scp_assembly_required);
2712 if (result != JNI_OK) {
2713 return result;
2714 }
2715
2716 return JNI_OK;
2717 }
2718
2719 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2720 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2721 // are dealing with -agentpath (case where name is a path), otherwise with
2722 // -agentlib
2723 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2724 char *_name;
2725 const char *_hprof = "hprof", *_jdwp = "jdwp";
2726 size_t _len_hprof, _len_jdwp, _len_prefix;
2727
2728 if (is_path) {
2729 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2730 return false;
2731 }
2732
2733 _name++; // skip past last path separator
2734 _len_prefix = strlen(JNI_LIB_PREFIX);
2735
2736 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2737 return false;
2738 }
2739
2740 _name += _len_prefix;
2741 _len_hprof = strlen(_hprof);
2742 _len_jdwp = strlen(_jdwp);
2743
2744 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2745 _name += _len_hprof;
2746 }
2747 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2748 _name += _len_jdwp;
2749 }
2750 else {
2751 return false;
2752 }
2753
2754 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2755 return false;
2756 }
2757
2758 return true;
2759 }
2760
2761 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2762 return true;
2763 }
2764
2765 return false;
2766 }
2767
2768 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2769 SysClassPath* scp_p,
2770 bool* scp_assembly_required_p,
2771 Flag::Flags origin) {
2772 // Remaining part of option string
2773 const char* tail;
2774
2775 // iterate over arguments
2776 for (int index = 0; index < args->nOptions; index++) {
2777 bool is_absolute_path = false; // for -agentpath vs -agentlib
2778
2779 const JavaVMOption* option = args->options + index;
2780
2781 if (!match_option(option, "-Djava.class.path", &tail) &&
2782 !match_option(option, "-Dsun.java.command", &tail) &&
2783 !match_option(option, "-Dsun.java.launcher", &tail)) {
2784
2785 // add all jvm options to the jvm_args string. This string
2786 // is used later to set the java.vm.args PerfData string constant.
2787 // the -Djava.class.path and the -Dsun.java.command options are
2788 // omitted from jvm_args string as each have their own PerfData
2789 // string constant object.
2790 build_jvm_args(option->optionString);
2791 }
2792
2793 // -verbose:[class/gc/jni]
2794 if (match_option(option, "-verbose", &tail)) {
2795 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2796 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2797 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2798 } else if (!strcmp(tail, ":gc")) {
2799 FLAG_SET_CMDLINE(bool, PrintGC, true);
2800 } else if (!strcmp(tail, ":jni")) {
2801 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2802 }
2803 // -da / -ea / -disableassertions / -enableassertions
2804 // These accept an optional class/package name separated by a colon, e.g.,
2805 // -da:java.lang.Thread.
2806 } else if (match_option(option, user_assertion_options, &tail, true)) {
2807 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2808 if (*tail == '\0') {
2809 JavaAssertions::setUserClassDefault(enable);
2810 } else {
2811 assert(*tail == ':', "bogus match by match_option()");
2812 JavaAssertions::addOption(tail + 1, enable);
2813 }
2814 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2815 } else if (match_option(option, system_assertion_options, &tail, false)) {
2816 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2817 JavaAssertions::setSystemClassDefault(enable);
2818 // -bootclasspath:
2819 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2820 scp_p->reset_path(tail);
2821 *scp_assembly_required_p = true;
2822 // -bootclasspath/a:
2823 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2824 scp_p->add_suffix(tail);
2825 *scp_assembly_required_p = true;
2826 // -bootclasspath/p:
2827 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2828 scp_p->add_prefix(tail);
2829 *scp_assembly_required_p = true;
2830 // -Xrun
2831 } else if (match_option(option, "-Xrun", &tail)) {
2832 if (tail != NULL) {
2833 const char* pos = strchr(tail, ':');
2834 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2835 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2836 name[len] = '\0';
2837
2838 char *options = NULL;
2839 if(pos != NULL) {
2840 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2841 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2842 }
2843 #if !INCLUDE_JVMTI
2844 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2845 jio_fprintf(defaultStream::error_stream(),
2846 "Profiling and debugging agents are not supported in this VM\n");
2847 return JNI_ERR;
2848 }
2849 #endif // !INCLUDE_JVMTI
2850 add_init_library(name, options);
2851 }
2852 // -agentlib and -agentpath
2853 } else if (match_option(option, "-agentlib:", &tail) ||
2854 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2855 if(tail != NULL) {
2856 const char* pos = strchr(tail, '=');
2857 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2858 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2859 name[len] = '\0';
2860
2861 char *options = NULL;
2862 if(pos != NULL) {
2863 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2864 }
2865 #if !INCLUDE_JVMTI
2866 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2867 jio_fprintf(defaultStream::error_stream(),
2868 "Profiling and debugging agents are not supported in this VM\n");
2869 return JNI_ERR;
2870 }
2871 #endif // !INCLUDE_JVMTI
2872 add_init_agent(name, options, is_absolute_path);
2873 }
2874 // -javaagent
2875 } else if (match_option(option, "-javaagent:", &tail)) {
2876 #if !INCLUDE_JVMTI
2877 jio_fprintf(defaultStream::error_stream(),
2878 "Instrumentation agents are not supported in this VM\n");
2879 return JNI_ERR;
2880 #else
2881 if(tail != NULL) {
2882 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2883 add_init_agent("instrument", options, false);
2884 }
2885 #endif // !INCLUDE_JVMTI
2886 // -Xnoclassgc
2887 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2888 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2889 // -Xincgc: i-CMS
2890 } else if (match_option(option, "-Xincgc", &tail)) {
2891 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2892 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2893 // -Xnoincgc: no i-CMS
2894 } else if (match_option(option, "-Xnoincgc", &tail)) {
2895 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2896 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2897 // -Xconcgc
2898 } else if (match_option(option, "-Xconcgc", &tail)) {
2899 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2900 // -Xnoconcgc
2901 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2902 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2903 // -Xbatch
2904 } else if (match_option(option, "-Xbatch", &tail)) {
2905 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2906 // -Xmn for compatibility with other JVM vendors
2907 } else if (match_option(option, "-Xmn", &tail)) {
2908 julong long_initial_young_size = 0;
2909 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2910 if (errcode != arg_in_range) {
2911 jio_fprintf(defaultStream::error_stream(),
2912 "Invalid initial young generation size: %s\n", option->optionString);
2913 describe_range_error(errcode);
2914 return JNI_EINVAL;
2915 }
2916 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2917 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2918 // -Xms
2919 } else if (match_option(option, "-Xms", &tail)) {
2920 julong long_initial_heap_size = 0;
2921 // an initial heap size of 0 means automatically determine
2922 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2923 if (errcode != arg_in_range) {
2924 jio_fprintf(defaultStream::error_stream(),
2925 "Invalid initial heap size: %s\n", option->optionString);
2926 describe_range_error(errcode);
2927 return JNI_EINVAL;
2928 }
2929 set_min_heap_size((uintx)long_initial_heap_size);
2930 // Currently the minimum size and the initial heap sizes are the same.
2931 // Can be overridden with -XX:InitialHeapSize.
2932 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2933 // -Xmx
2934 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2935 julong long_max_heap_size = 0;
2936 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2937 if (errcode != arg_in_range) {
2938 jio_fprintf(defaultStream::error_stream(),
2939 "Invalid maximum heap size: %s\n", option->optionString);
2940 describe_range_error(errcode);
2941 return JNI_EINVAL;
2942 }
2943 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2944 // Xmaxf
2945 } else if (match_option(option, "-Xmaxf", &tail)) {
2946 char* err;
2947 int maxf = (int)(strtod(tail, &err) * 100);
2948 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2949 jio_fprintf(defaultStream::error_stream(),
2950 "Bad max heap free percentage size: %s\n",
2951 option->optionString);
2952 return JNI_EINVAL;
2953 } else {
2954 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2955 }
2956 // Xminf
2957 } else if (match_option(option, "-Xminf", &tail)) {
2958 char* err;
2959 int minf = (int)(strtod(tail, &err) * 100);
2960 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2961 jio_fprintf(defaultStream::error_stream(),
2962 "Bad min heap free percentage size: %s\n",
2963 option->optionString);
2964 return JNI_EINVAL;
2965 } else {
2966 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2967 }
2968 // -Xss
2969 } else if (match_option(option, "-Xss", &tail)) {
2970 julong long_ThreadStackSize = 0;
2971 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2972 if (errcode != arg_in_range) {
2973 jio_fprintf(defaultStream::error_stream(),
2974 "Invalid thread stack size: %s\n", option->optionString);
2975 describe_range_error(errcode);
2976 return JNI_EINVAL;
2977 }
2978 // Internally track ThreadStackSize in units of 1024 bytes.
2979 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2980 round_to((int)long_ThreadStackSize, K) / K);
2981 // -Xoss
2982 } else if (match_option(option, "-Xoss", &tail)) {
2983 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2984 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2985 julong long_CodeCacheExpansionSize = 0;
2986 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2987 if (errcode != arg_in_range) {
2988 jio_fprintf(defaultStream::error_stream(),
2989 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2990 os::vm_page_size()/K);
2991 return JNI_EINVAL;
2992 }
2993 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2994 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2995 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2996 julong long_ReservedCodeCacheSize = 0;
2997
2998 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2999 if (errcode != arg_in_range) {
3000 jio_fprintf(defaultStream::error_stream(),
3001 "Invalid maximum code cache size: %s.\n", option->optionString);
3002 return JNI_EINVAL;
3003 }
3004 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
3005 // -XX:NonNMethodCodeHeapSize=
3006 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
3007 julong long_NonNMethodCodeHeapSize = 0;
3008
3009 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
3010 if (errcode != arg_in_range) {
3011 jio_fprintf(defaultStream::error_stream(),
3012 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3013 return JNI_EINVAL;
3014 }
3015 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize);
3016 // -XX:ProfiledCodeHeapSize=
3017 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3018 julong long_ProfiledCodeHeapSize = 0;
3019
3020 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3021 if (errcode != arg_in_range) {
3022 jio_fprintf(defaultStream::error_stream(),
3023 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3024 return JNI_EINVAL;
3025 }
3026 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
3027 // -XX:NonProfiledCodeHeapSizee=
3028 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3029 julong long_NonProfiledCodeHeapSize = 0;
3030
3031 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3032 if (errcode != arg_in_range) {
3033 jio_fprintf(defaultStream::error_stream(),
3034 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3035 return JNI_EINVAL;
3036 }
3037 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
3038 //-XX:IncreaseFirstTierCompileThresholdAt=
3039 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
3040 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
3041 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
3042 jio_fprintf(defaultStream::error_stream(),
3043 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
3044 option->optionString);
3045 return JNI_EINVAL;
3046 }
3047 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
3048 // -green
3049 } else if (match_option(option, "-green", &tail)) {
3050 jio_fprintf(defaultStream::error_stream(),
3051 "Green threads support not available\n");
3052 return JNI_EINVAL;
3053 // -native
3054 } else if (match_option(option, "-native", &tail)) {
3055 // HotSpot always uses native threads, ignore silently for compatibility
3056 // -Xsqnopause
3057 } else if (match_option(option, "-Xsqnopause", &tail)) {
3058 // EVM option, ignore silently for compatibility
3059 // -Xrs
3060 } else if (match_option(option, "-Xrs", &tail)) {
3061 // Classic/EVM option, new functionality
3062 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
3063 } else if (match_option(option, "-Xusealtsigs", &tail)) {
3064 // change default internal VM signals used - lower case for back compat
3065 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
3066 // -Xoptimize
3067 } else if (match_option(option, "-Xoptimize", &tail)) {
3068 // EVM option, ignore silently for compatibility
3069 // -Xprof
3070 } else if (match_option(option, "-Xprof", &tail)) {
3071 #if INCLUDE_FPROF
3072 _has_profile = true;
3073 #else // INCLUDE_FPROF
3074 jio_fprintf(defaultStream::error_stream(),
3075 "Flat profiling is not supported in this VM.\n");
3076 return JNI_ERR;
3077 #endif // INCLUDE_FPROF
3078 // -Xconcurrentio
3079 } else if (match_option(option, "-Xconcurrentio", &tail)) {
3080 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
3081 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
3082 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
3083 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3084 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
3085
3086 // -Xinternalversion
3087 } else if (match_option(option, "-Xinternalversion", &tail)) {
3088 jio_fprintf(defaultStream::output_stream(), "%s\n",
3089 VM_Version::internal_vm_info_string());
3090 vm_exit(0);
3091 #ifndef PRODUCT
3092 // -Xprintflags
3093 } else if (match_option(option, "-Xprintflags", &tail)) {
3094 CommandLineFlags::printFlags(tty, false);
3095 vm_exit(0);
3096 #endif
3097 // -D
3098 } else if (match_option(option, "-D", &tail)) {
3099 if (!add_property(tail)) {
3100 return JNI_ENOMEM;
3101 }
3102 // Out of the box management support
3103 if (match_option(option, "-Dcom.sun.management", &tail)) {
3104 #if INCLUDE_MANAGEMENT
3105 FLAG_SET_CMDLINE(bool, ManagementServer, true);
3106 #else
3107 jio_fprintf(defaultStream::output_stream(),
3108 "-Dcom.sun.management is not supported in this VM.\n");
3109 return JNI_ERR;
3110 #endif
3111 }
3112 // -Xint
3113 } else if (match_option(option, "-Xint", &tail)) {
3114 set_mode_flags(_int);
3115 // -Xmixed
3116 } else if (match_option(option, "-Xmixed", &tail)) {
3117 set_mode_flags(_mixed);
3118 // -Xcomp
3119 } else if (match_option(option, "-Xcomp", &tail)) {
3120 // for testing the compiler; turn off all flags that inhibit compilation
3121 set_mode_flags(_comp);
3122 // -Xshare:dump
3123 } else if (match_option(option, "-Xshare:dump", &tail)) {
3124 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3125 set_mode_flags(_int); // Prevent compilation, which creates objects
3126 // -Xshare:on
3127 } else if (match_option(option, "-Xshare:on", &tail)) {
3128 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3129 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3130 // -Xshare:auto
3131 } else if (match_option(option, "-Xshare:auto", &tail)) {
3132 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3133 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3134 // -Xshare:off
3135 } else if (match_option(option, "-Xshare:off", &tail)) {
3136 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3137 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3138 // -Xverify
3139 } else if (match_option(option, "-Xverify", &tail)) {
3140 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3141 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3142 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3143 } else if (strcmp(tail, ":remote") == 0) {
3144 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3145 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3146 } else if (strcmp(tail, ":none") == 0) {
3147 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3148 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3149 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3150 return JNI_EINVAL;
3151 }
3152 // -Xdebug
3153 } else if (match_option(option, "-Xdebug", &tail)) {
3154 // note this flag has been used, then ignore
3155 set_xdebug_mode(true);
3156 // -Xnoagent
3157 } else if (match_option(option, "-Xnoagent", &tail)) {
3158 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3159 } else if (match_option(option, "-Xboundthreads", &tail)) {
3160 // Bind user level threads to kernel threads (Solaris only)
3161 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3162 } else if (match_option(option, "-Xloggc:", &tail)) {
3163 // Redirect GC output to the file. -Xloggc:<filename>
3164 // ostream_init_log(), when called will use this filename
3165 // to initialize a fileStream.
3166 _gc_log_filename = os::strdup_check_oom(tail);
3167 if (!is_filename_valid(_gc_log_filename)) {
3168 jio_fprintf(defaultStream::output_stream(),
3169 "Invalid file name for use with -Xloggc: Filename can only contain the "
3170 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3171 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3172 return JNI_EINVAL;
3173 }
3174 FLAG_SET_CMDLINE(bool, PrintGC, true);
3175 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3176
3177 // JNI hooks
3178 } else if (match_option(option, "-Xcheck", &tail)) {
3179 if (!strcmp(tail, ":jni")) {
3180 #if !INCLUDE_JNI_CHECK
3181 warning("JNI CHECKING is not supported in this VM");
3182 #else
3183 CheckJNICalls = true;
3184 #endif // INCLUDE_JNI_CHECK
3185 } else if (is_bad_option(option, args->ignoreUnrecognized,
3186 "check")) {
3187 return JNI_EINVAL;
3188 }
3189 } else if (match_option(option, "vfprintf", &tail)) {
3190 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3191 } else if (match_option(option, "exit", &tail)) {
3192 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3193 } else if (match_option(option, "abort", &tail)) {
3194 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3195 // -XX:+AggressiveHeap
3196 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
3197
3198 // This option inspects the machine and attempts to set various
3199 // parameters to be optimal for long-running, memory allocation
3200 // intensive jobs. It is intended for machines with large
3201 // amounts of cpu and memory.
3202
3203 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3204 // VM, but we may not be able to represent the total physical memory
3205 // available (like having 8gb of memory on a box but using a 32bit VM).
3206 // Thus, we need to make sure we're using a julong for intermediate
3207 // calculations.
3208 julong initHeapSize;
3209 julong total_memory = os::physical_memory();
3210
3211 if (total_memory < (julong)256*M) {
3212 jio_fprintf(defaultStream::error_stream(),
3213 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3214 vm_exit(1);
3215 }
3216
3217 // The heap size is half of available memory, or (at most)
3218 // all of possible memory less 160mb (leaving room for the OS
3219 // when using ISM). This is the maximum; because adaptive sizing
3220 // is turned on below, the actual space used may be smaller.
3221
3222 initHeapSize = MIN2(total_memory / (julong)2,
3223 total_memory - (julong)160*M);
3224
3225 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3226
3227 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3228 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3229 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3230 // Currently the minimum size and the initial heap sizes are the same.
3231 set_min_heap_size(initHeapSize);
3232 }
3233 if (FLAG_IS_DEFAULT(NewSize)) {
3234 // Make the young generation 3/8ths of the total heap.
3235 FLAG_SET_CMDLINE(uintx, NewSize,
3236 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3237 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3238 }
3239
3240 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3241 FLAG_SET_DEFAULT(UseLargePages, true);
3242 #endif
3243
3244 // Increase some data structure sizes for efficiency
3245 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3246 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3247 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3248
3249 // See the OldPLABSize comment below, but replace 'after promotion'
3250 // with 'after copying'. YoungPLABSize is the size of the survivor
3251 // space per-gc-thread buffers. The default is 4kw.
3252 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3253
3254 // OldPLABSize is the size of the buffers in the old gen that
3255 // UseParallelGC uses to promote live data that doesn't fit in the
3256 // survivor spaces. At any given time, there's one for each gc thread.
3257 // The default size is 1kw. These buffers are rarely used, since the
3258 // survivor spaces are usually big enough. For specjbb, however, there
3259 // are occasions when there's lots of live data in the young gen
3260 // and we end up promoting some of it. We don't have a definite
3261 // explanation for why bumping OldPLABSize helps, but the theory
3262 // is that a bigger PLAB results in retaining something like the
3263 // original allocation order after promotion, which improves mutator
3264 // locality. A minor effect may be that larger PLABs reduce the
3265 // number of PLAB allocation events during gc. The value of 8kw
3266 // was arrived at by experimenting with specjbb.
3267 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3268
3269 // Enable parallel GC and adaptive generation sizing
3270 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3271 FLAG_SET_DEFAULT(ParallelGCThreads,
3272 Abstract_VM_Version::parallel_worker_threads());
3273
3274 // Encourage steady state memory management
3275 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3276
3277 // This appears to improve mutator locality
3278 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3279
3280 // Get around early Solaris scheduling bug
3281 // (affinity vs other jobs on system)
3282 // but disallow DR and offlining (5008695).
3283 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3284
3285 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3286 // and the last option wins.
3287 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3288 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3289 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3290 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3291 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3292 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3293 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3294 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3295 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3296 uintx max_tenuring_thresh = 0;
3297 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3298 jio_fprintf(defaultStream::error_stream(),
3299 "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3300 }
3301 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3302
3303 if (MaxTenuringThreshold == 0) {
3304 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3305 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3306 } else {
3307 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3308 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3309 }
3310 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3311 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3312 jio_fprintf(defaultStream::error_stream(),
3313 "Please use CMSClassUnloadingEnabled in place of "
3314 "CMSPermGenSweepingEnabled in the future\n");
3315 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3316 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3317 jio_fprintf(defaultStream::error_stream(),
3318 "Please use -XX:+UseGCOverheadLimit in place of "
3319 "-XX:+UseGCTimeLimit in the future\n");
3320 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3321 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3322 jio_fprintf(defaultStream::error_stream(),
3323 "Please use -XX:-UseGCOverheadLimit in place of "
3324 "-XX:-UseGCTimeLimit in the future\n");
3325 // The TLE options are for compatibility with 1.3 and will be
3326 // removed without notice in a future release. These options
3327 // are not to be documented.
3328 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3329 // No longer used.
3330 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3331 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3332 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3333 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3334 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3335 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3336 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3337 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3338 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3339 // No longer used.
3340 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3341 julong long_tlab_size = 0;
3342 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3343 if (errcode != arg_in_range) {
3344 jio_fprintf(defaultStream::error_stream(),
3345 "Invalid TLAB size: %s\n", option->optionString);
3346 describe_range_error(errcode);
3347 return JNI_EINVAL;
3348 }
3349 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3350 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3351 // No longer used.
3352 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3353 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3354 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3355 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3356 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3357 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3358 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3359 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3360 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3361 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3362 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3363 #if defined(DTRACE_ENABLED)
3364 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3365 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3366 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3367 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3368 #else // defined(DTRACE_ENABLED)
3369 jio_fprintf(defaultStream::error_stream(),
3370 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3371 return JNI_EINVAL;
3372 #endif // defined(DTRACE_ENABLED)
3373 #ifdef ASSERT
3374 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3375 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3376 // disable scavenge before parallel mark-compact
3377 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3378 #endif
3379 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3380 julong cms_blocks_to_claim = (julong)atol(tail);
3381 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3382 jio_fprintf(defaultStream::error_stream(),
3383 "Please use -XX:OldPLABSize in place of "
3384 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3385 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3386 julong cms_blocks_to_claim = (julong)atol(tail);
3387 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3388 jio_fprintf(defaultStream::error_stream(),
3389 "Please use -XX:OldPLABSize in place of "
3390 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3391 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3392 julong old_plab_size = 0;
3393 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3394 if (errcode != arg_in_range) {
3395 jio_fprintf(defaultStream::error_stream(),
3396 "Invalid old PLAB size: %s\n", option->optionString);
3397 describe_range_error(errcode);
3398 return JNI_EINVAL;
3399 }
3400 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3401 jio_fprintf(defaultStream::error_stream(),
3402 "Please use -XX:OldPLABSize in place of "
3403 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3404 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3405 julong young_plab_size = 0;
3406 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3407 if (errcode != arg_in_range) {
3408 jio_fprintf(defaultStream::error_stream(),
3409 "Invalid young PLAB size: %s\n", option->optionString);
3410 describe_range_error(errcode);
3411 return JNI_EINVAL;
3412 }
3413 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3414 jio_fprintf(defaultStream::error_stream(),
3415 "Please use -XX:YoungPLABSize in place of "
3416 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3417 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3418 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3419 julong stack_size = 0;
3420 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3421 if (errcode != arg_in_range) {
3422 jio_fprintf(defaultStream::error_stream(),
3423 "Invalid mark stack size: %s\n", option->optionString);
3424 describe_range_error(errcode);
3425 return JNI_EINVAL;
3426 }
3427 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3428 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3429 julong max_stack_size = 0;
3430 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3431 if (errcode != arg_in_range) {
3432 jio_fprintf(defaultStream::error_stream(),
3433 "Invalid maximum mark stack size: %s\n",
3434 option->optionString);
3435 describe_range_error(errcode);
3436 return JNI_EINVAL;
3437 }
3438 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3439 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3440 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3441 uintx conc_threads = 0;
3442 if (!parse_uintx(tail, &conc_threads, 1)) {
3443 jio_fprintf(defaultStream::error_stream(),
3444 "Invalid concurrent threads: %s\n", option->optionString);
3445 return JNI_EINVAL;
3446 }
3447 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3448 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3449 julong max_direct_memory_size = 0;
3450 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3451 if (errcode != arg_in_range) {
3452 jio_fprintf(defaultStream::error_stream(),
3453 "Invalid maximum direct memory size: %s\n",
3454 option->optionString);
3455 describe_range_error(errcode);
3456 return JNI_EINVAL;
3457 }
3458 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3459 #if !INCLUDE_MANAGEMENT
3460 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3461 jio_fprintf(defaultStream::error_stream(),
3462 "ManagementServer is not supported in this VM.\n");
3463 return JNI_ERR;
3464 #endif // INCLUDE_MANAGEMENT
3465 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3466 // Skip -XX:Flags= since that case has already been handled
3467 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3468 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3469 return JNI_EINVAL;
3470 }
3471 }
3472 // Unknown option
3473 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3474 return JNI_ERR;
3475 }
3476 }
3477
3478 // PrintSharedArchiveAndExit will turn on
3479 // -Xshare:on
3480 // -XX:+TraceClassPaths
3481 if (PrintSharedArchiveAndExit) {
3482 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3483 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3484 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3485 }
3486
3487 // Change the default value for flags which have different default values
3488 // when working with older JDKs.
3489 #ifdef LINUX
3490 if (JDK_Version::current().compare_major(6) <= 0 &&
3491 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3492 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3493 }
3494 #endif // LINUX
3495 fix_appclasspath();
3496 return JNI_OK;
3497 }
3498
3499 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3500 //
3501 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3502 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3503 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3504 // path is treated as the current directory.
3505 //
3506 // This causes problems with CDS, which requires that all directories specified in the classpath
3507 // must be empty. In most cases, applications do NOT want to load classes from the current
3508 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3509 // scripts compatible with CDS.
3510 void Arguments::fix_appclasspath() {
3511 if (IgnoreEmptyClassPaths) {
3512 const char separator = *os::path_separator();
3513 const char* src = _java_class_path->value();
3514
3515 // skip over all the leading empty paths
3516 while (*src == separator) {
3517 src ++;
3518 }
3519
3520 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3521 strncpy(copy, src, strlen(src) + 1);
3522
3523 // trim all trailing empty paths
3524 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3525 *tail = '\0';
3526 }
3527
3528 char from[3] = {separator, separator, '\0'};
3529 char to [2] = {separator, '\0'};
3530 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3531 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3532 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3533 }
3534
3535 _java_class_path->set_value(copy);
3536 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3537 }
3538
3539 if (!PrintSharedArchiveAndExit) {
3540 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3541 }
3542 }
3543
3544 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3545 // This must be done after all -D arguments have been processed.
3546 scp_p->expand_endorsed();
3547
3548 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3549 // Assemble the bootclasspath elements into the final path.
3550 Arguments::set_sysclasspath(scp_p->combined_path());
3551 }
3552
3553 // This must be done after all arguments have been processed.
3554 // java_compiler() true means set to "NONE" or empty.
3555 if (java_compiler() && !xdebug_mode()) {
3556 // For backwards compatibility, we switch to interpreted mode if
3557 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3558 // not specified.
3559 set_mode_flags(_int);
3560 }
3561
3562 if ((TieredCompilation && CompileThresholdScaling == 0)
3563 || (!TieredCompilation && get_scaled_compile_threshold(CompileThreshold) == 0)) {
3564 set_mode_flags(_int);
3565 }
3566
3567 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3568 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3569 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3570 }
3571
3572 #ifndef COMPILER2
3573 // Don't degrade server performance for footprint
3574 if (FLAG_IS_DEFAULT(UseLargePages) &&
3575 MaxHeapSize < LargePageHeapSizeThreshold) {
3576 // No need for large granularity pages w/small heaps.
3577 // Note that large pages are enabled/disabled for both the
3578 // Java heap and the code cache.
3579 FLAG_SET_DEFAULT(UseLargePages, false);
3580 }
3581
3582 #else
3583 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3584 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3585 }
3586 #endif
3587
3588 #ifndef TIERED
3589 // Tiered compilation is undefined.
3590 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3591 #endif
3592
3593 // If we are running in a headless jre, force java.awt.headless property
3594 // to be true unless the property has already been set.
3595 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3596 if (os::is_headless_jre()) {
3597 const char* headless = Arguments::get_property("java.awt.headless");
3598 if (headless == NULL) {
3599 char envbuffer[128];
3600 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3601 if (!add_property("java.awt.headless=true")) {
3602 return JNI_ENOMEM;
3603 }
3604 } else {
3605 char buffer[256];
3606 strcpy(buffer, "java.awt.headless=");
3607 strcat(buffer, envbuffer);
3608 if (!add_property(buffer)) {
3609 return JNI_ENOMEM;
3610 }
3611 }
3612 }
3613 }
3614
3615 if (!ArgumentsExt::check_vm_args_consistency()) {
3616 return JNI_ERR;
3617 }
3618
3619 return JNI_OK;
3620 }
3621
3622 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3623 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3624 scp_assembly_required_p);
3625 }
3626
3627 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3628 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3629 scp_assembly_required_p);
3630 }
3631
3632 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3633 const int N_MAX_OPTIONS = 64;
3634 const int OPTION_BUFFER_SIZE = 1024;
3635 char buffer[OPTION_BUFFER_SIZE];
3636
3637 // The variable will be ignored if it exceeds the length of the buffer.
3638 // Don't check this variable if user has special privileges
3639 // (e.g. unix su command).
3640 if (os::getenv(name, buffer, sizeof(buffer)) &&
3641 !os::have_special_privileges()) {
3642 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3643 jio_fprintf(defaultStream::error_stream(),
3644 "Picked up %s: %s\n", name, buffer);
3645 char* rd = buffer; // pointer to the input string (rd)
3646 int i;
3647 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3648 while (isspace(*rd)) rd++; // skip whitespace
3649 if (*rd == 0) break; // we re done when the input string is read completely
3650
3651 // The output, option string, overwrites the input string.
3652 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3653 // input string (rd).
3654 char* wrt = rd;
3655
3656 options[i++].optionString = wrt; // Fill in option
3657 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3658 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3659 int quote = *rd; // matching quote to look for
3660 rd++; // don't copy open quote
3661 while (*rd != quote) { // include everything (even spaces) up until quote
3662 if (*rd == 0) { // string termination means unmatched string
3663 jio_fprintf(defaultStream::error_stream(),
3664 "Unmatched quote in %s\n", name);
3665 return JNI_ERR;
3666 }
3667 *wrt++ = *rd++; // copy to option string
3668 }
3669 rd++; // don't copy close quote
3670 } else {
3671 *wrt++ = *rd++; // copy to option string
3672 }
3673 }
3674 // Need to check if we're done before writing a NULL,
3675 // because the write could be to the byte that rd is pointing to.
3676 if (*rd++ == 0) {
3677 *wrt = 0;
3678 break;
3679 }
3680 *wrt = 0; // Zero terminate option
3681 }
3682 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3683 JavaVMInitArgs vm_args;
3684 vm_args.version = JNI_VERSION_1_2;
3685 vm_args.options = options;
3686 vm_args.nOptions = i;
3687 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3688
3689 if (PrintVMOptions) {
3690 const char* tail;
3691 for (int i = 0; i < vm_args.nOptions; i++) {
3692 const JavaVMOption *option = vm_args.options + i;
3693 if (match_option(option, "-XX:", &tail)) {
3694 logOption(tail);
3695 }
3696 }
3697 }
3698
3699 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3700 }
3701 return JNI_OK;
3702 }
3703
3704 void Arguments::set_shared_spaces_flags() {
3705 if (DumpSharedSpaces) {
3706 if (RequireSharedSpaces) {
3707 warning("cannot dump shared archive while using shared archive");
3708 }
3709 UseSharedSpaces = false;
3710 #ifdef _LP64
3711 if (!UseCompressedOops || !UseCompressedClassPointers) {
3712 vm_exit_during_initialization(
3713 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3714 }
3715 } else {
3716 if (!UseCompressedOops || !UseCompressedClassPointers) {
3717 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3718 }
3719 #endif
3720 }
3721 }
3722
3723 #if !INCLUDE_ALL_GCS
3724 static void force_serial_gc() {
3725 FLAG_SET_DEFAULT(UseSerialGC, true);
3726 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3727 UNSUPPORTED_GC_OPTION(UseG1GC);
3728 UNSUPPORTED_GC_OPTION(UseParallelGC);
3729 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3730 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3731 UNSUPPORTED_GC_OPTION(UseParNewGC);
3732 }
3733 #endif // INCLUDE_ALL_GCS
3734
3735 // Sharing support
3736 // Construct the path to the archive
3737 static char* get_shared_archive_path() {
3738 char *shared_archive_path;
3739 if (SharedArchiveFile == NULL) {
3740 char jvm_path[JVM_MAXPATHLEN];
3741 os::jvm_path(jvm_path, sizeof(jvm_path));
3742 char *end = strrchr(jvm_path, *os::file_separator());
3743 if (end != NULL) *end = '\0';
3744 size_t jvm_path_len = strlen(jvm_path);
3745 size_t file_sep_len = strlen(os::file_separator());
3746 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3747 file_sep_len + 20, mtInternal);
3748 if (shared_archive_path != NULL) {
3749 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3750 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3751 strncat(shared_archive_path, "classes.jsa", 11);
3752 }
3753 } else {
3754 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3755 if (shared_archive_path != NULL) {
3756 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3757 }
3758 }
3759 return shared_archive_path;
3760 }
3761
3762 #ifndef PRODUCT
3763 // Determine whether LogVMOutput should be implicitly turned on.
3764 static bool use_vm_log() {
3765 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3766 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3767 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3768 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3769 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3770 return true;
3771 }
3772
3773 #ifdef COMPILER1
3774 if (PrintC1Statistics) {
3775 return true;
3776 }
3777 #endif // COMPILER1
3778
3779 #ifdef COMPILER2
3780 if (PrintOptoAssembly || PrintOptoStatistics) {
3781 return true;
3782 }
3783 #endif // COMPILER2
3784
3785 return false;
3786 }
3787 #endif // PRODUCT
3788
3789 // Parse entry point called from JNI_CreateJavaVM
3790
3791 jint Arguments::parse(const JavaVMInitArgs* args) {
3792
3793 // Remaining part of option string
3794 const char* tail;
3795
3796 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3797 const char* hotspotrc = ".hotspotrc";
3798 bool settings_file_specified = false;
3799 bool needs_hotspotrc_warning = false;
3800
3801 const char* flags_file;
3802 int index;
3803 for (index = 0; index < args->nOptions; index++) {
3804 const JavaVMOption *option = args->options + index;
3805 if (ArgumentsExt::process_options(option)) {
3806 continue;
3807 }
3808 if (match_option(option, "-XX:Flags=", &tail)) {
3809 flags_file = tail;
3810 settings_file_specified = true;
3811 continue;
3812 }
3813 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3814 PrintVMOptions = true;
3815 continue;
3816 }
3817 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3818 PrintVMOptions = false;
3819 continue;
3820 }
3821 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3822 IgnoreUnrecognizedVMOptions = true;
3823 continue;
3824 }
3825 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3826 IgnoreUnrecognizedVMOptions = false;
3827 continue;
3828 }
3829 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3830 CommandLineFlags::printFlags(tty, false);
3831 vm_exit(0);
3832 }
3833 #if INCLUDE_NMT
3834 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3835 // The launcher did not setup nmt environment variable properly.
3836 if (!MemTracker::check_launcher_nmt_support(tail)) {
3837 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3838 }
3839
3840 // Verify if nmt option is valid.
3841 if (MemTracker::verify_nmt_option()) {
3842 // Late initialization, still in single-threaded mode.
3843 if (MemTracker::tracking_level() >= NMT_summary) {
3844 MemTracker::init();
3845 }
3846 } else {
3847 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3848 }
3849 continue;
3850 }
3851 #endif
3852
3853
3854 #ifndef PRODUCT
3855 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3856 CommandLineFlags::printFlags(tty, true);
3857 vm_exit(0);
3858 }
3859 #endif
3860 }
3861
3862 if (IgnoreUnrecognizedVMOptions) {
3863 // uncast const to modify the flag args->ignoreUnrecognized
3864 *(jboolean*)(&args->ignoreUnrecognized) = true;
3865 }
3866
3867 // Parse specified settings file
3868 if (settings_file_specified) {
3869 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3870 return JNI_EINVAL;
3871 }
3872 } else {
3873 #ifdef ASSERT
3874 // Parse default .hotspotrc settings file
3875 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3876 return JNI_EINVAL;
3877 }
3878 #else
3879 struct stat buf;
3880 if (os::stat(hotspotrc, &buf) == 0) {
3881 needs_hotspotrc_warning = true;
3882 }
3883 #endif
3884 }
3885
3886 if (PrintVMOptions) {
3887 for (index = 0; index < args->nOptions; index++) {
3888 const JavaVMOption *option = args->options + index;
3889 if (match_option(option, "-XX:", &tail)) {
3890 logOption(tail);
3891 }
3892 }
3893 }
3894
3895 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3896 jint result = parse_vm_init_args(args);
3897 if (result != JNI_OK) {
3898 return result;
3899 }
3900
3901 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3902 SharedArchivePath = get_shared_archive_path();
3903 if (SharedArchivePath == NULL) {
3904 return JNI_ENOMEM;
3905 }
3906
3907 // Set up VerifySharedSpaces
3908 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3909 VerifySharedSpaces = true;
3910 }
3911
3912 // Delay warning until here so that we've had a chance to process
3913 // the -XX:-PrintWarnings flag
3914 if (needs_hotspotrc_warning) {
3915 warning("%s file is present but has been ignored. "
3916 "Run with -XX:Flags=%s to load the file.",
3917 hotspotrc, hotspotrc);
3918 }
3919
3920 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3921 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3922 #endif
3923
3924 #if INCLUDE_ALL_GCS
3925 #if (defined JAVASE_EMBEDDED || defined ARM)
3926 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3927 #endif
3928 #endif
3929
3930 #ifndef PRODUCT
3931 if (TraceBytecodesAt != 0) {
3932 TraceBytecodes = true;
3933 }
3934 if (CountCompiledCalls) {
3935 if (UseCounterDecay) {
3936 warning("UseCounterDecay disabled because CountCalls is set");
3937 UseCounterDecay = false;
3938 }
3939 }
3940 #endif // PRODUCT
3941
3942 if (ScavengeRootsInCode == 0) {
3943 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3944 warning("forcing ScavengeRootsInCode non-zero");
3945 }
3946 ScavengeRootsInCode = 1;
3947 }
3948
3949 if (PrintGCDetails) {
3950 // Turn on -verbose:gc options as well
3951 PrintGC = true;
3952 }
3953
3954 // Set object alignment values.
3955 set_object_alignment();
3956
3957 #if !INCLUDE_ALL_GCS
3958 force_serial_gc();
3959 #endif // INCLUDE_ALL_GCS
3960 #if !INCLUDE_CDS
3961 if (DumpSharedSpaces || RequireSharedSpaces) {
3962 jio_fprintf(defaultStream::error_stream(),
3963 "Shared spaces are not supported in this VM\n");
3964 return JNI_ERR;
3965 }
3966 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3967 warning("Shared spaces are not supported in this VM");
3968 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3969 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3970 }
3971 no_shared_spaces("CDS Disabled");
3972 #endif // INCLUDE_CDS
3973
3974 return JNI_OK;
3975 }
3976
3977 jint Arguments::apply_ergo() {
3978
3979 // Set flags based on ergonomics.
3980 set_ergonomics_flags();
3981
3982 set_shared_spaces_flags();
3983
3984 // Check the GC selections again.
3985 if (!ArgumentsExt::check_gc_consistency_ergo()) {
3986 return JNI_EINVAL;
3987 }
3988
3989 if (TieredCompilation) {
3990 set_tiered_flags();
3991 } else {
3992 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3993 if (CompilationPolicyChoice >= 2) {
3994 vm_exit_during_initialization(
3995 "Incompatible compilation policy selected", NULL);
3996 }
3997 // Scale CompileThreshold
3998 if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) {
3999 FLAG_SET_ERGO(intx, CompileThreshold, get_scaled_compile_threshold(CompileThreshold));
4000 }
4001 }
4002
4003 #ifdef COMPILER2
4004 #ifndef PRODUCT
4005 if (PrintIdealGraphLevel > 0) {
4006 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4007 }
4008 #endif
4009 #endif
4010
4011 // Set heap size based on available physical memory
4012 set_heap_size();
4013
4014 set_gc_specific_flags();
4015
4016 // Initialize Metaspace flags and alignments
4017 Metaspace::ergo_initialize();
4018
4019 // Set bytecode rewriting flags
4020 set_bytecode_flags();
4021
4022 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4023 set_aggressive_opts_flags();
4024
4025 // Turn off biased locking for locking debug mode flags,
4026 // which are subtly different from each other but neither works with
4027 // biased locking
4028 if (UseHeavyMonitors
4029 #ifdef COMPILER1
4030 || !UseFastLocking
4031 #endif // COMPILER1
4032 ) {
4033 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4034 // flag set to true on command line; warn the user that they
4035 // can't enable biased locking here
4036 warning("Biased Locking is not supported with locking debug flags"
4037 "; ignoring UseBiasedLocking flag." );
4038 }
4039 UseBiasedLocking = false;
4040 }
4041
4042 #ifdef ZERO
4043 // Clear flags not supported on zero.
4044 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4045 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4046 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4047 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4048 #endif // CC_INTERP
4049
4050 #ifdef COMPILER2
4051 if (!EliminateLocks) {
4052 EliminateNestedLocks = false;
4053 }
4054 if (!Inline) {
4055 IncrementalInline = false;
4056 }
4057 #ifndef PRODUCT
4058 if (!IncrementalInline) {
4059 AlwaysIncrementalInline = false;
4060 }
4061 #endif
4062 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4063 // nothing to use the profiling, turn if off
4064 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4065 }
4066 #endif
4067
4068 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4069 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4070 DebugNonSafepoints = true;
4071 }
4072
4073 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4074 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4075 }
4076
4077 #ifndef PRODUCT
4078 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4079 if (use_vm_log()) {
4080 LogVMOutput = true;
4081 }
4082 }
4083 #endif // PRODUCT
4084
4085 if (PrintCommandLineFlags) {
4086 CommandLineFlags::printSetFlags(tty);
4087 }
4088
4089 // Apply CPU specific policy for the BiasedLocking
4090 if (UseBiasedLocking) {
4091 if (!VM_Version::use_biased_locking() &&
4092 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4093 UseBiasedLocking = false;
4094 }
4095 }
4096 #ifdef COMPILER2
4097 if (!UseBiasedLocking || EmitSync != 0) {
4098 UseOptoBiasInlining = false;
4099 }
4100 #endif
4101
4102 return JNI_OK;
4103 }
4104
4105 jint Arguments::adjust_after_os() {
4106 if (UseNUMA) {
4107 if (UseParallelGC || UseParallelOldGC) {
4108 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4109 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4110 }
4111 }
4112 // UseNUMAInterleaving is set to ON for all collectors and
4113 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4114 // such as the parallel collector for Linux and Solaris will
4115 // interleave old gen and survivor spaces on top of NUMA
4116 // allocation policy for the eden space.
4117 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4118 // all platforms and ParallelGC on Windows will interleave all
4119 // of the heap spaces across NUMA nodes.
4120 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4121 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4122 }
4123 }
4124 return JNI_OK;
4125 }
4126
4127 int Arguments::PropertyList_count(SystemProperty* pl) {
4128 int count = 0;
4129 while(pl != NULL) {
4130 count++;
4131 pl = pl->next();
4132 }
4133 return count;
4134 }
4135
4136 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4137 assert(key != NULL, "just checking");
4138 SystemProperty* prop;
4139 for (prop = pl; prop != NULL; prop = prop->next()) {
4140 if (strcmp(key, prop->key()) == 0) return prop->value();
4141 }
4142 return NULL;
4143 }
4144
4145 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4146 int count = 0;
4147 const char* ret_val = NULL;
4148
4149 while(pl != NULL) {
4150 if(count >= index) {
4151 ret_val = pl->key();
4152 break;
4153 }
4154 count++;
4155 pl = pl->next();
4156 }
4157
4158 return ret_val;
4159 }
4160
4161 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4162 int count = 0;
4163 char* ret_val = NULL;
4164
4165 while(pl != NULL) {
4166 if(count >= index) {
4167 ret_val = pl->value();
4168 break;
4169 }
4170 count++;
4171 pl = pl->next();
4172 }
4173
4174 return ret_val;
4175 }
4176
4177 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4178 SystemProperty* p = *plist;
4179 if (p == NULL) {
4180 *plist = new_p;
4181 } else {
4182 while (p->next() != NULL) {
4183 p = p->next();
4184 }
4185 p->set_next(new_p);
4186 }
4187 }
4188
4189 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4190 if (plist == NULL)
4191 return;
4192
4193 SystemProperty* new_p = new SystemProperty(k, v, true);
4194 PropertyList_add(plist, new_p);
4195 }
4196
4197 // This add maintains unique property key in the list.
4198 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4199 if (plist == NULL)
4200 return;
4201
4202 // If property key exist then update with new value.
4203 SystemProperty* prop;
4204 for (prop = *plist; prop != NULL; prop = prop->next()) {
4205 if (strcmp(k, prop->key()) == 0) {
4206 if (append) {
4207 prop->append_value(v);
4208 } else {
4209 prop->set_value(v);
4210 }
4211 return;
4212 }
4213 }
4214
4215 PropertyList_add(plist, k, v);
4216 }
4217
4218 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4219 // Returns true if all of the source pointed by src has been copied over to
4220 // the destination buffer pointed by buf. Otherwise, returns false.
4221 // Notes:
4222 // 1. If the length (buflen) of the destination buffer excluding the
4223 // NULL terminator character is not long enough for holding the expanded
4224 // pid characters, it also returns false instead of returning the partially
4225 // expanded one.
4226 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4227 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4228 char* buf, size_t buflen) {
4229 const char* p = src;
4230 char* b = buf;
4231 const char* src_end = &src[srclen];
4232 char* buf_end = &buf[buflen - 1];
4233
4234 while (p < src_end && b < buf_end) {
4235 if (*p == '%') {
4236 switch (*(++p)) {
4237 case '%': // "%%" ==> "%"
4238 *b++ = *p++;
4239 break;
4240 case 'p': { // "%p" ==> current process id
4241 // buf_end points to the character before the last character so
4242 // that we could write '\0' to the end of the buffer.
4243 size_t buf_sz = buf_end - b + 1;
4244 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4245
4246 // if jio_snprintf fails or the buffer is not long enough to hold
4247 // the expanded pid, returns false.
4248 if (ret < 0 || ret >= (int)buf_sz) {
4249 return false;
4250 } else {
4251 b += ret;
4252 assert(*b == '\0', "fail in copy_expand_pid");
4253 if (p == src_end && b == buf_end + 1) {
4254 // reach the end of the buffer.
4255 return true;
4256 }
4257 }
4258 p++;
4259 break;
4260 }
4261 default :
4262 *b++ = '%';
4263 }
4264 } else {
4265 *b++ = *p++;
4266 }
4267 }
4268 *b = '\0';
4269 return (p == src_end); // return false if not all of the source was copied
4270 }