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