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rev 3708 : 8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
Summary: Set the value of MarkStackSize to a value based on the number of parallel marking threads with a reasonable minimum. Expand the marking stack if we have to restart marking due to an overflow up to a reasonable maximum. Allocate the underlying space for the marking stack from virtual memory.
Reviewed-by: jmasa
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--- old/src/share/vm/runtime/arguments.cpp
+++ new/src/share/vm/runtime/arguments.cpp
1 1 /*
2 2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 4 *
5 5 * This code is free software; you can redistribute it and/or modify it
6 6 * under the terms of the GNU General Public License version 2 only, as
7 7 * published by the Free Software Foundation.
8 8 *
9 9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 12 * version 2 for more details (a copy is included in the LICENSE file that
13 13 * accompanied this code).
14 14 *
15 15 * You should have received a copy of the GNU General Public License version
16 16 * 2 along with this work; if not, write to the Free Software Foundation,
17 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 18 *
19 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 20 * or visit www.oracle.com if you need additional information or have any
21 21 * questions.
22 22 *
23 23 */
24 24
25 25 #include "precompiled.hpp"
26 26 #include "classfile/javaAssertions.hpp"
27 27 #include "compiler/compilerOracle.hpp"
28 28 #include "memory/allocation.inline.hpp"
29 29 #include "memory/cardTableRS.hpp"
30 30 #include "memory/referenceProcessor.hpp"
31 31 #include "memory/universe.inline.hpp"
32 32 #include "oops/oop.inline.hpp"
33 33 #include "prims/jvmtiExport.hpp"
34 34 #include "runtime/arguments.hpp"
35 35 #include "runtime/globals_extension.hpp"
36 36 #include "runtime/java.hpp"
37 37 #include "services/management.hpp"
38 38 #include "services/memTracker.hpp"
39 39 #include "utilities/defaultStream.hpp"
40 40 #include "utilities/taskqueue.hpp"
41 41 #ifdef TARGET_OS_FAMILY_linux
42 42 # include "os_linux.inline.hpp"
43 43 #endif
44 44 #ifdef TARGET_OS_FAMILY_solaris
45 45 # include "os_solaris.inline.hpp"
46 46 #endif
47 47 #ifdef TARGET_OS_FAMILY_windows
48 48 # include "os_windows.inline.hpp"
49 49 #endif
50 50 #ifdef TARGET_OS_FAMILY_bsd
51 51 # include "os_bsd.inline.hpp"
52 52 #endif
53 53 #ifndef SERIALGC
54 54 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
55 55 #endif
56 56
57 57 // Note: This is a special bug reporting site for the JVM
58 58 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
59 59 #define DEFAULT_JAVA_LAUNCHER "generic"
60 60
61 61 char** Arguments::_jvm_flags_array = NULL;
62 62 int Arguments::_num_jvm_flags = 0;
63 63 char** Arguments::_jvm_args_array = NULL;
64 64 int Arguments::_num_jvm_args = 0;
65 65 char* Arguments::_java_command = NULL;
66 66 SystemProperty* Arguments::_system_properties = NULL;
67 67 const char* Arguments::_gc_log_filename = NULL;
68 68 bool Arguments::_has_profile = false;
69 69 bool Arguments::_has_alloc_profile = false;
70 70 uintx Arguments::_min_heap_size = 0;
71 71 Arguments::Mode Arguments::_mode = _mixed;
72 72 bool Arguments::_java_compiler = false;
73 73 bool Arguments::_xdebug_mode = false;
74 74 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
75 75 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
76 76 int Arguments::_sun_java_launcher_pid = -1;
77 77 bool Arguments::_created_by_gamma_launcher = false;
78 78
79 79 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
80 80 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
81 81 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
82 82 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
83 83 bool Arguments::_ClipInlining = ClipInlining;
84 84
85 85 char* Arguments::SharedArchivePath = NULL;
86 86
87 87 AgentLibraryList Arguments::_libraryList;
88 88 AgentLibraryList Arguments::_agentList;
89 89
90 90 abort_hook_t Arguments::_abort_hook = NULL;
91 91 exit_hook_t Arguments::_exit_hook = NULL;
92 92 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
93 93
94 94
95 95 SystemProperty *Arguments::_java_ext_dirs = NULL;
96 96 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
97 97 SystemProperty *Arguments::_sun_boot_library_path = NULL;
98 98 SystemProperty *Arguments::_java_library_path = NULL;
99 99 SystemProperty *Arguments::_java_home = NULL;
100 100 SystemProperty *Arguments::_java_class_path = NULL;
101 101 SystemProperty *Arguments::_sun_boot_class_path = NULL;
102 102
103 103 char* Arguments::_meta_index_path = NULL;
104 104 char* Arguments::_meta_index_dir = NULL;
105 105
106 106 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
107 107
108 108 static bool match_option(const JavaVMOption *option, const char* name,
109 109 const char** tail) {
110 110 int len = (int)strlen(name);
111 111 if (strncmp(option->optionString, name, len) == 0) {
112 112 *tail = option->optionString + len;
113 113 return true;
114 114 } else {
115 115 return false;
116 116 }
117 117 }
118 118
119 119 static void logOption(const char* opt) {
120 120 if (PrintVMOptions) {
121 121 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
122 122 }
123 123 }
124 124
125 125 // Process java launcher properties.
126 126 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
127 127 // See if sun.java.launcher or sun.java.launcher.pid is defined.
128 128 // Must do this before setting up other system properties,
129 129 // as some of them may depend on launcher type.
130 130 for (int index = 0; index < args->nOptions; index++) {
131 131 const JavaVMOption* option = args->options + index;
132 132 const char* tail;
133 133
134 134 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
135 135 process_java_launcher_argument(tail, option->extraInfo);
136 136 continue;
137 137 }
138 138 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
139 139 _sun_java_launcher_pid = atoi(tail);
140 140 continue;
141 141 }
142 142 }
143 143 }
144 144
145 145 // Initialize system properties key and value.
146 146 void Arguments::init_system_properties() {
147 147
148 148 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
149 149 "Java Virtual Machine Specification", false));
150 150 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
151 151 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
152 152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
153 153
154 154 // following are JVMTI agent writeable properties.
155 155 // Properties values are set to NULL and they are
156 156 // os specific they are initialized in os::init_system_properties_values().
157 157 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
158 158 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
159 159 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
160 160 _java_library_path = new SystemProperty("java.library.path", NULL, true);
161 161 _java_home = new SystemProperty("java.home", NULL, true);
162 162 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
163 163
164 164 _java_class_path = new SystemProperty("java.class.path", "", true);
165 165
166 166 // Add to System Property list.
167 167 PropertyList_add(&_system_properties, _java_ext_dirs);
168 168 PropertyList_add(&_system_properties, _java_endorsed_dirs);
169 169 PropertyList_add(&_system_properties, _sun_boot_library_path);
170 170 PropertyList_add(&_system_properties, _java_library_path);
171 171 PropertyList_add(&_system_properties, _java_home);
172 172 PropertyList_add(&_system_properties, _java_class_path);
173 173 PropertyList_add(&_system_properties, _sun_boot_class_path);
174 174
175 175 // Set OS specific system properties values
176 176 os::init_system_properties_values();
177 177 }
178 178
179 179
180 180 // Update/Initialize System properties after JDK version number is known
181 181 void Arguments::init_version_specific_system_properties() {
182 182 enum { bufsz = 16 };
183 183 char buffer[bufsz];
184 184 const char* spec_vendor = "Sun Microsystems Inc.";
185 185 uint32_t spec_version = 0;
186 186
187 187 if (JDK_Version::is_gte_jdk17x_version()) {
188 188 spec_vendor = "Oracle Corporation";
189 189 spec_version = JDK_Version::current().major_version();
190 190 }
191 191 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
192 192
193 193 PropertyList_add(&_system_properties,
194 194 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
195 195 PropertyList_add(&_system_properties,
196 196 new SystemProperty("java.vm.specification.version", buffer, false));
197 197 PropertyList_add(&_system_properties,
198 198 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
199 199 }
200 200
201 201 /**
202 202 * Provide a slightly more user-friendly way of eliminating -XX flags.
203 203 * When a flag is eliminated, it can be added to this list in order to
204 204 * continue accepting this flag on the command-line, while issuing a warning
205 205 * and ignoring the value. Once the JDK version reaches the 'accept_until'
206 206 * limit, we flatly refuse to admit the existence of the flag. This allows
207 207 * a flag to die correctly over JDK releases using HSX.
208 208 */
209 209 typedef struct {
210 210 const char* name;
211 211 JDK_Version obsoleted_in; // when the flag went away
212 212 JDK_Version accept_until; // which version to start denying the existence
213 213 } ObsoleteFlag;
214 214
215 215 static ObsoleteFlag obsolete_jvm_flags[] = {
216 216 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
217 217 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
218 218 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
219 219 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
220 220 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
221 221 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
222 222 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
223 223 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 224 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 225 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 226 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 227 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 228 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
229 229 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
230 230 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
231 231 { "DefaultInitialRAMFraction",
232 232 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
233 233 { "UseDepthFirstScavengeOrder",
234 234 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
235 235 { "HandlePromotionFailure",
236 236 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
237 237 { "MaxLiveObjectEvacuationRatio",
238 238 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
239 239 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
240 240 { "UseParallelOldGCCompacting",
241 241 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
242 242 { "UseParallelDensePrefixUpdate",
243 243 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
244 244 { "UseParallelOldGCDensePrefix",
245 245 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
246 246 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
247 247 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
248 248 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
249 249 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
250 250 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
251 251 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
252 252 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
253 253 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
254 254 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
255 255 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
256 256 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
257 257 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
258 258 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
259 259 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
260 260 #ifdef PRODUCT
261 261 { "DesiredMethodLimit",
262 262 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
263 263 #endif // PRODUCT
264 264 { NULL, JDK_Version(0), JDK_Version(0) }
265 265 };
266 266
267 267 // Returns true if the flag is obsolete and fits into the range specified
268 268 // for being ignored. In the case that the flag is ignored, the 'version'
269 269 // value is filled in with the version number when the flag became
270 270 // obsolete so that that value can be displayed to the user.
271 271 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
272 272 int i = 0;
273 273 assert(version != NULL, "Must provide a version buffer");
274 274 while (obsolete_jvm_flags[i].name != NULL) {
275 275 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
276 276 // <flag>=xxx form
277 277 // [-|+]<flag> form
278 278 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
279 279 ((s[0] == '+' || s[0] == '-') &&
280 280 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
281 281 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
282 282 *version = flag_status.obsoleted_in;
283 283 return true;
284 284 }
285 285 }
286 286 i++;
287 287 }
288 288 return false;
289 289 }
290 290
291 291 // Constructs the system class path (aka boot class path) from the following
292 292 // components, in order:
293 293 //
294 294 // prefix // from -Xbootclasspath/p:...
295 295 // endorsed // the expansion of -Djava.endorsed.dirs=...
296 296 // base // from os::get_system_properties() or -Xbootclasspath=
297 297 // suffix // from -Xbootclasspath/a:...
298 298 //
299 299 // java.endorsed.dirs is a list of directories; any jar or zip files in the
300 300 // directories are added to the sysclasspath just before the base.
301 301 //
302 302 // This could be AllStatic, but it isn't needed after argument processing is
303 303 // complete.
304 304 class SysClassPath: public StackObj {
305 305 public:
306 306 SysClassPath(const char* base);
307 307 ~SysClassPath();
308 308
309 309 inline void set_base(const char* base);
310 310 inline void add_prefix(const char* prefix);
311 311 inline void add_suffix_to_prefix(const char* suffix);
312 312 inline void add_suffix(const char* suffix);
313 313 inline void reset_path(const char* base);
314 314
315 315 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
316 316 // property. Must be called after all command-line arguments have been
317 317 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
318 318 // combined_path().
319 319 void expand_endorsed();
320 320
321 321 inline const char* get_base() const { return _items[_scp_base]; }
322 322 inline const char* get_prefix() const { return _items[_scp_prefix]; }
323 323 inline const char* get_suffix() const { return _items[_scp_suffix]; }
324 324 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
325 325
326 326 // Combine all the components into a single c-heap-allocated string; caller
327 327 // must free the string if/when no longer needed.
328 328 char* combined_path();
329 329
330 330 private:
331 331 // Utility routines.
332 332 static char* add_to_path(const char* path, const char* str, bool prepend);
333 333 static char* add_jars_to_path(char* path, const char* directory);
334 334
335 335 inline void reset_item_at(int index);
336 336
337 337 // Array indices for the items that make up the sysclasspath. All except the
338 338 // base are allocated in the C heap and freed by this class.
339 339 enum {
340 340 _scp_prefix, // from -Xbootclasspath/p:...
341 341 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
342 342 _scp_base, // the default sysclasspath
343 343 _scp_suffix, // from -Xbootclasspath/a:...
344 344 _scp_nitems // the number of items, must be last.
345 345 };
346 346
347 347 const char* _items[_scp_nitems];
348 348 DEBUG_ONLY(bool _expansion_done;)
349 349 };
350 350
351 351 SysClassPath::SysClassPath(const char* base) {
352 352 memset(_items, 0, sizeof(_items));
353 353 _items[_scp_base] = base;
354 354 DEBUG_ONLY(_expansion_done = false;)
355 355 }
356 356
357 357 SysClassPath::~SysClassPath() {
358 358 // Free everything except the base.
359 359 for (int i = 0; i < _scp_nitems; ++i) {
360 360 if (i != _scp_base) reset_item_at(i);
361 361 }
362 362 DEBUG_ONLY(_expansion_done = false;)
363 363 }
364 364
365 365 inline void SysClassPath::set_base(const char* base) {
366 366 _items[_scp_base] = base;
367 367 }
368 368
369 369 inline void SysClassPath::add_prefix(const char* prefix) {
370 370 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
371 371 }
372 372
373 373 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
374 374 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
375 375 }
376 376
377 377 inline void SysClassPath::add_suffix(const char* suffix) {
378 378 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
379 379 }
380 380
381 381 inline void SysClassPath::reset_item_at(int index) {
382 382 assert(index < _scp_nitems && index != _scp_base, "just checking");
383 383 if (_items[index] != NULL) {
384 384 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
385 385 _items[index] = NULL;
386 386 }
387 387 }
388 388
389 389 inline void SysClassPath::reset_path(const char* base) {
390 390 // Clear the prefix and suffix.
391 391 reset_item_at(_scp_prefix);
392 392 reset_item_at(_scp_suffix);
393 393 set_base(base);
394 394 }
395 395
396 396 //------------------------------------------------------------------------------
397 397
398 398 void SysClassPath::expand_endorsed() {
399 399 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
400 400
401 401 const char* path = Arguments::get_property("java.endorsed.dirs");
402 402 if (path == NULL) {
403 403 path = Arguments::get_endorsed_dir();
404 404 assert(path != NULL, "no default for java.endorsed.dirs");
405 405 }
406 406
407 407 char* expanded_path = NULL;
408 408 const char separator = *os::path_separator();
409 409 const char* const end = path + strlen(path);
410 410 while (path < end) {
411 411 const char* tmp_end = strchr(path, separator);
412 412 if (tmp_end == NULL) {
413 413 expanded_path = add_jars_to_path(expanded_path, path);
414 414 path = end;
415 415 } else {
416 416 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
417 417 memcpy(dirpath, path, tmp_end - path);
418 418 dirpath[tmp_end - path] = '\0';
419 419 expanded_path = add_jars_to_path(expanded_path, dirpath);
420 420 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
421 421 path = tmp_end + 1;
422 422 }
423 423 }
424 424 _items[_scp_endorsed] = expanded_path;
425 425 DEBUG_ONLY(_expansion_done = true;)
426 426 }
427 427
428 428 // Combine the bootclasspath elements, some of which may be null, into a single
429 429 // c-heap-allocated string.
430 430 char* SysClassPath::combined_path() {
431 431 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
432 432 assert(_expansion_done, "must call expand_endorsed() first.");
433 433
434 434 size_t lengths[_scp_nitems];
435 435 size_t total_len = 0;
436 436
437 437 const char separator = *os::path_separator();
438 438
439 439 // Get the lengths.
440 440 int i;
441 441 for (i = 0; i < _scp_nitems; ++i) {
442 442 if (_items[i] != NULL) {
443 443 lengths[i] = strlen(_items[i]);
444 444 // Include space for the separator char (or a NULL for the last item).
445 445 total_len += lengths[i] + 1;
446 446 }
447 447 }
448 448 assert(total_len > 0, "empty sysclasspath not allowed");
449 449
450 450 // Copy the _items to a single string.
451 451 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
452 452 char* cp_tmp = cp;
453 453 for (i = 0; i < _scp_nitems; ++i) {
454 454 if (_items[i] != NULL) {
455 455 memcpy(cp_tmp, _items[i], lengths[i]);
456 456 cp_tmp += lengths[i];
457 457 *cp_tmp++ = separator;
458 458 }
459 459 }
460 460 *--cp_tmp = '\0'; // Replace the extra separator.
461 461 return cp;
462 462 }
463 463
464 464 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
465 465 char*
466 466 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
467 467 char *cp;
468 468
469 469 assert(str != NULL, "just checking");
470 470 if (path == NULL) {
471 471 size_t len = strlen(str) + 1;
472 472 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
473 473 memcpy(cp, str, len); // copy the trailing null
474 474 } else {
475 475 const char separator = *os::path_separator();
476 476 size_t old_len = strlen(path);
477 477 size_t str_len = strlen(str);
478 478 size_t len = old_len + str_len + 2;
479 479
480 480 if (prepend) {
481 481 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
482 482 char* cp_tmp = cp;
483 483 memcpy(cp_tmp, str, str_len);
484 484 cp_tmp += str_len;
485 485 *cp_tmp = separator;
486 486 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
487 487 FREE_C_HEAP_ARRAY(char, path, mtInternal);
488 488 } else {
489 489 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
490 490 char* cp_tmp = cp + old_len;
491 491 *cp_tmp = separator;
492 492 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
493 493 }
494 494 }
495 495 return cp;
496 496 }
497 497
498 498 // Scan the directory and append any jar or zip files found to path.
499 499 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
500 500 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
501 501 DIR* dir = os::opendir(directory);
502 502 if (dir == NULL) return path;
503 503
504 504 char dir_sep[2] = { '\0', '\0' };
505 505 size_t directory_len = strlen(directory);
506 506 const char fileSep = *os::file_separator();
507 507 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
508 508
509 509 /* Scan the directory for jars/zips, appending them to path. */
510 510 struct dirent *entry;
511 511 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
512 512 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
513 513 const char* name = entry->d_name;
514 514 const char* ext = name + strlen(name) - 4;
515 515 bool isJarOrZip = ext > name &&
516 516 (os::file_name_strcmp(ext, ".jar") == 0 ||
517 517 os::file_name_strcmp(ext, ".zip") == 0);
518 518 if (isJarOrZip) {
519 519 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
520 520 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
521 521 path = add_to_path(path, jarpath, false);
522 522 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
523 523 }
524 524 }
525 525 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
526 526 os::closedir(dir);
527 527 return path;
528 528 }
529 529
530 530 // Parses a memory size specification string.
531 531 static bool atomull(const char *s, julong* result) {
532 532 julong n = 0;
533 533 int args_read = sscanf(s, os::julong_format_specifier(), &n);
534 534 if (args_read != 1) {
535 535 return false;
536 536 }
537 537 while (*s != '\0' && isdigit(*s)) {
538 538 s++;
539 539 }
540 540 // 4705540: illegal if more characters are found after the first non-digit
541 541 if (strlen(s) > 1) {
542 542 return false;
543 543 }
544 544 switch (*s) {
545 545 case 'T': case 't':
546 546 *result = n * G * K;
547 547 // Check for overflow.
548 548 if (*result/((julong)G * K) != n) return false;
549 549 return true;
550 550 case 'G': case 'g':
551 551 *result = n * G;
552 552 if (*result/G != n) return false;
553 553 return true;
554 554 case 'M': case 'm':
555 555 *result = n * M;
556 556 if (*result/M != n) return false;
557 557 return true;
558 558 case 'K': case 'k':
559 559 *result = n * K;
560 560 if (*result/K != n) return false;
561 561 return true;
562 562 case '\0':
563 563 *result = n;
564 564 return true;
565 565 default:
566 566 return false;
567 567 }
568 568 }
569 569
570 570 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
571 571 if (size < min_size) return arg_too_small;
572 572 // Check that size will fit in a size_t (only relevant on 32-bit)
573 573 if (size > max_uintx) return arg_too_big;
574 574 return arg_in_range;
575 575 }
576 576
577 577 // Describe an argument out of range error
578 578 void Arguments::describe_range_error(ArgsRange errcode) {
579 579 switch(errcode) {
580 580 case arg_too_big:
581 581 jio_fprintf(defaultStream::error_stream(),
582 582 "The specified size exceeds the maximum "
583 583 "representable size.\n");
584 584 break;
585 585 case arg_too_small:
586 586 case arg_unreadable:
587 587 case arg_in_range:
588 588 // do nothing for now
589 589 break;
590 590 default:
591 591 ShouldNotReachHere();
592 592 }
593 593 }
594 594
595 595 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
596 596 return CommandLineFlags::boolAtPut(name, &value, origin);
597 597 }
598 598
599 599 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
600 600 double v;
601 601 if (sscanf(value, "%lf", &v) != 1) {
602 602 return false;
603 603 }
604 604
605 605 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
606 606 return true;
607 607 }
608 608 return false;
609 609 }
610 610
611 611 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
612 612 julong v;
613 613 intx intx_v;
614 614 bool is_neg = false;
615 615 // Check the sign first since atomull() parses only unsigned values.
616 616 if (*value == '-') {
617 617 if (!CommandLineFlags::intxAt(name, &intx_v)) {
618 618 return false;
619 619 }
620 620 value++;
621 621 is_neg = true;
622 622 }
623 623 if (!atomull(value, &v)) {
624 624 return false;
625 625 }
626 626 intx_v = (intx) v;
627 627 if (is_neg) {
628 628 intx_v = -intx_v;
629 629 }
630 630 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
631 631 return true;
632 632 }
633 633 uintx uintx_v = (uintx) v;
634 634 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
635 635 return true;
636 636 }
637 637 uint64_t uint64_t_v = (uint64_t) v;
638 638 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
639 639 return true;
640 640 }
641 641 return false;
642 642 }
643 643
644 644 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
645 645 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
646 646 // Contract: CommandLineFlags always returns a pointer that needs freeing.
647 647 FREE_C_HEAP_ARRAY(char, value, mtInternal);
648 648 return true;
649 649 }
650 650
651 651 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
652 652 const char* old_value = "";
653 653 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
654 654 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
655 655 size_t new_len = strlen(new_value);
656 656 const char* value;
657 657 char* free_this_too = NULL;
658 658 if (old_len == 0) {
659 659 value = new_value;
660 660 } else if (new_len == 0) {
661 661 value = old_value;
662 662 } else {
663 663 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
664 664 // each new setting adds another LINE to the switch:
665 665 sprintf(buf, "%s\n%s", old_value, new_value);
666 666 value = buf;
667 667 free_this_too = buf;
668 668 }
669 669 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
670 670 // CommandLineFlags always returns a pointer that needs freeing.
671 671 FREE_C_HEAP_ARRAY(char, value, mtInternal);
672 672 if (free_this_too != NULL) {
673 673 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
674 674 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
675 675 }
676 676 return true;
677 677 }
678 678
679 679 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
680 680
681 681 // range of acceptable characters spelled out for portability reasons
682 682 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
683 683 #define BUFLEN 255
684 684 char name[BUFLEN+1];
685 685 char dummy;
686 686
687 687 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
688 688 return set_bool_flag(name, false, origin);
689 689 }
690 690 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
691 691 return set_bool_flag(name, true, origin);
692 692 }
693 693
694 694 char punct;
695 695 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
696 696 const char* value = strchr(arg, '=') + 1;
697 697 Flag* flag = Flag::find_flag(name, strlen(name));
698 698 if (flag != NULL && flag->is_ccstr()) {
699 699 if (flag->ccstr_accumulates()) {
700 700 return append_to_string_flag(name, value, origin);
701 701 } else {
702 702 if (value[0] == '\0') {
703 703 value = NULL;
704 704 }
705 705 return set_string_flag(name, value, origin);
706 706 }
707 707 }
708 708 }
709 709
710 710 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
711 711 const char* value = strchr(arg, '=') + 1;
712 712 // -XX:Foo:=xxx will reset the string flag to the given value.
713 713 if (value[0] == '\0') {
714 714 value = NULL;
715 715 }
716 716 return set_string_flag(name, value, origin);
717 717 }
718 718
719 719 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
720 720 #define SIGNED_NUMBER_RANGE "[-0123456789]"
721 721 #define NUMBER_RANGE "[0123456789]"
722 722 char value[BUFLEN + 1];
723 723 char value2[BUFLEN + 1];
724 724 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
725 725 // Looks like a floating-point number -- try again with more lenient format string
726 726 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
727 727 return set_fp_numeric_flag(name, value, origin);
728 728 }
729 729 }
730 730
731 731 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
732 732 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
733 733 return set_numeric_flag(name, value, origin);
734 734 }
735 735
736 736 return false;
737 737 }
738 738
739 739 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
740 740 assert(bldarray != NULL, "illegal argument");
741 741
742 742 if (arg == NULL) {
743 743 return;
744 744 }
745 745
746 746 int index = *count;
747 747
748 748 // expand the array and add arg to the last element
749 749 (*count)++;
750 750 if (*bldarray == NULL) {
751 751 *bldarray = NEW_C_HEAP_ARRAY(char*, *count, mtInternal);
752 752 } else {
753 753 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count, mtInternal);
754 754 }
755 755 (*bldarray)[index] = strdup(arg);
756 756 }
757 757
758 758 void Arguments::build_jvm_args(const char* arg) {
759 759 add_string(&_jvm_args_array, &_num_jvm_args, arg);
760 760 }
761 761
762 762 void Arguments::build_jvm_flags(const char* arg) {
763 763 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
764 764 }
765 765
766 766 // utility function to return a string that concatenates all
767 767 // strings in a given char** array
768 768 const char* Arguments::build_resource_string(char** args, int count) {
769 769 if (args == NULL || count == 0) {
770 770 return NULL;
771 771 }
772 772 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
773 773 for (int i = 1; i < count; i++) {
774 774 length += strlen(args[i]) + 1; // add 1 for a space
775 775 }
776 776 char* s = NEW_RESOURCE_ARRAY(char, length);
777 777 strcpy(s, args[0]);
778 778 for (int j = 1; j < count; j++) {
779 779 strcat(s, " ");
780 780 strcat(s, args[j]);
781 781 }
782 782 return (const char*) s;
783 783 }
784 784
785 785 void Arguments::print_on(outputStream* st) {
786 786 st->print_cr("VM Arguments:");
787 787 if (num_jvm_flags() > 0) {
788 788 st->print("jvm_flags: "); print_jvm_flags_on(st);
789 789 }
790 790 if (num_jvm_args() > 0) {
791 791 st->print("jvm_args: "); print_jvm_args_on(st);
792 792 }
793 793 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
794 794 st->print_cr("Launcher Type: %s", _sun_java_launcher);
795 795 }
796 796
797 797 void Arguments::print_jvm_flags_on(outputStream* st) {
798 798 if (_num_jvm_flags > 0) {
799 799 for (int i=0; i < _num_jvm_flags; i++) {
800 800 st->print("%s ", _jvm_flags_array[i]);
801 801 }
802 802 st->print_cr("");
803 803 }
804 804 }
805 805
806 806 void Arguments::print_jvm_args_on(outputStream* st) {
807 807 if (_num_jvm_args > 0) {
808 808 for (int i=0; i < _num_jvm_args; i++) {
809 809 st->print("%s ", _jvm_args_array[i]);
810 810 }
811 811 st->print_cr("");
812 812 }
813 813 }
814 814
815 815 bool Arguments::process_argument(const char* arg,
816 816 jboolean ignore_unrecognized, FlagValueOrigin origin) {
817 817
818 818 JDK_Version since = JDK_Version();
819 819
820 820 if (parse_argument(arg, origin) || ignore_unrecognized) {
821 821 return true;
822 822 }
823 823
824 824 const char * const argname = *arg == '+' || *arg == '-' ? arg + 1 : arg;
825 825 if (is_newly_obsolete(arg, &since)) {
826 826 char version[256];
827 827 since.to_string(version, sizeof(version));
828 828 warning("ignoring option %s; support was removed in %s", argname, version);
829 829 return true;
830 830 }
831 831
832 832 // For locked flags, report a custom error message if available.
833 833 // Otherwise, report the standard unrecognized VM option.
834 834
835 835 Flag* locked_flag = Flag::find_flag((char*)argname, strlen(argname), true);
836 836 if (locked_flag != NULL) {
837 837 char locked_message_buf[BUFLEN];
838 838 locked_flag->get_locked_message(locked_message_buf, BUFLEN);
839 839 if (strlen(locked_message_buf) == 0) {
840 840 jio_fprintf(defaultStream::error_stream(),
841 841 "Unrecognized VM option '%s'\n", argname);
842 842 } else {
843 843 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
844 844 }
845 845 } else {
846 846 jio_fprintf(defaultStream::error_stream(),
847 847 "Unrecognized VM option '%s'\n", argname);
848 848 }
849 849
850 850 // allow for commandline "commenting out" options like -XX:#+Verbose
851 851 return arg[0] == '#';
852 852 }
853 853
854 854 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
855 855 FILE* stream = fopen(file_name, "rb");
856 856 if (stream == NULL) {
857 857 if (should_exist) {
858 858 jio_fprintf(defaultStream::error_stream(),
859 859 "Could not open settings file %s\n", file_name);
860 860 return false;
861 861 } else {
862 862 return true;
863 863 }
864 864 }
865 865
866 866 char token[1024];
867 867 int pos = 0;
868 868
869 869 bool in_white_space = true;
870 870 bool in_comment = false;
871 871 bool in_quote = false;
872 872 char quote_c = 0;
873 873 bool result = true;
874 874
875 875 int c = getc(stream);
876 876 while(c != EOF) {
877 877 if (in_white_space) {
878 878 if (in_comment) {
879 879 if (c == '\n') in_comment = false;
880 880 } else {
881 881 if (c == '#') in_comment = true;
882 882 else if (!isspace(c)) {
883 883 in_white_space = false;
884 884 token[pos++] = c;
885 885 }
886 886 }
887 887 } else {
888 888 if (c == '\n' || (!in_quote && isspace(c))) {
889 889 // token ends at newline, or at unquoted whitespace
890 890 // this allows a way to include spaces in string-valued options
891 891 token[pos] = '\0';
892 892 logOption(token);
893 893 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
894 894 build_jvm_flags(token);
895 895 pos = 0;
896 896 in_white_space = true;
897 897 in_quote = false;
898 898 } else if (!in_quote && (c == '\'' || c == '"')) {
899 899 in_quote = true;
900 900 quote_c = c;
901 901 } else if (in_quote && (c == quote_c)) {
902 902 in_quote = false;
903 903 } else {
904 904 token[pos++] = c;
905 905 }
906 906 }
907 907 c = getc(stream);
908 908 }
909 909 if (pos > 0) {
910 910 token[pos] = '\0';
911 911 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
912 912 build_jvm_flags(token);
913 913 }
914 914 fclose(stream);
915 915 return result;
916 916 }
917 917
918 918 //=============================================================================================================
919 919 // Parsing of properties (-D)
920 920
921 921 const char* Arguments::get_property(const char* key) {
922 922 return PropertyList_get_value(system_properties(), key);
923 923 }
924 924
925 925 bool Arguments::add_property(const char* prop) {
926 926 const char* eq = strchr(prop, '=');
927 927 char* key;
928 928 // ns must be static--its address may be stored in a SystemProperty object.
929 929 const static char ns[1] = {0};
930 930 char* value = (char *)ns;
931 931
932 932 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
933 933 key = AllocateHeap(key_len + 1, mtInternal);
934 934 strncpy(key, prop, key_len);
935 935 key[key_len] = '\0';
936 936
937 937 if (eq != NULL) {
938 938 size_t value_len = strlen(prop) - key_len - 1;
939 939 value = AllocateHeap(value_len + 1, mtInternal);
940 940 strncpy(value, &prop[key_len + 1], value_len + 1);
941 941 }
942 942
943 943 if (strcmp(key, "java.compiler") == 0) {
944 944 process_java_compiler_argument(value);
945 945 FreeHeap(key);
946 946 if (eq != NULL) {
947 947 FreeHeap(value);
948 948 }
949 949 return true;
950 950 } else if (strcmp(key, "sun.java.command") == 0) {
951 951 _java_command = value;
952 952
953 953 // Record value in Arguments, but let it get passed to Java.
954 954 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
955 955 // launcher.pid property is private and is processed
956 956 // in process_sun_java_launcher_properties();
957 957 // the sun.java.launcher property is passed on to the java application
958 958 FreeHeap(key);
959 959 if (eq != NULL) {
960 960 FreeHeap(value);
961 961 }
962 962 return true;
963 963 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
964 964 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
965 965 // its value without going through the property list or making a Java call.
966 966 _java_vendor_url_bug = value;
967 967 } else if (strcmp(key, "sun.boot.library.path") == 0) {
968 968 PropertyList_unique_add(&_system_properties, key, value, true);
969 969 return true;
970 970 }
971 971 // Create new property and add at the end of the list
972 972 PropertyList_unique_add(&_system_properties, key, value);
973 973 return true;
974 974 }
975 975
976 976 //===========================================================================================================
977 977 // Setting int/mixed/comp mode flags
978 978
979 979 void Arguments::set_mode_flags(Mode mode) {
980 980 // Set up default values for all flags.
981 981 // If you add a flag to any of the branches below,
982 982 // add a default value for it here.
983 983 set_java_compiler(false);
984 984 _mode = mode;
985 985
986 986 // Ensure Agent_OnLoad has the correct initial values.
987 987 // This may not be the final mode; mode may change later in onload phase.
988 988 PropertyList_unique_add(&_system_properties, "java.vm.info",
989 989 (char*)VM_Version::vm_info_string(), false);
990 990
991 991 UseInterpreter = true;
992 992 UseCompiler = true;
993 993 UseLoopCounter = true;
994 994
995 995 #ifndef ZERO
996 996 // Turn these off for mixed and comp. Leave them on for Zero.
997 997 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
998 998 UseFastAccessorMethods = (mode == _int);
999 999 }
1000 1000 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1001 1001 UseFastEmptyMethods = (mode == _int);
1002 1002 }
1003 1003 #endif
1004 1004
1005 1005 // Default values may be platform/compiler dependent -
1006 1006 // use the saved values
1007 1007 ClipInlining = Arguments::_ClipInlining;
1008 1008 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1009 1009 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1010 1010 BackgroundCompilation = Arguments::_BackgroundCompilation;
1011 1011
1012 1012 // Change from defaults based on mode
1013 1013 switch (mode) {
1014 1014 default:
1015 1015 ShouldNotReachHere();
1016 1016 break;
1017 1017 case _int:
1018 1018 UseCompiler = false;
1019 1019 UseLoopCounter = false;
1020 1020 AlwaysCompileLoopMethods = false;
1021 1021 UseOnStackReplacement = false;
1022 1022 break;
1023 1023 case _mixed:
1024 1024 // same as default
1025 1025 break;
1026 1026 case _comp:
1027 1027 UseInterpreter = false;
1028 1028 BackgroundCompilation = false;
1029 1029 ClipInlining = false;
1030 1030 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1031 1031 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1032 1032 // compile a level 4 (C2) and then continue executing it.
1033 1033 if (TieredCompilation) {
1034 1034 Tier3InvokeNotifyFreqLog = 0;
1035 1035 Tier4InvocationThreshold = 0;
1036 1036 }
1037 1037 break;
1038 1038 }
1039 1039 }
1040 1040
1041 1041 // Conflict: required to use shared spaces (-Xshare:on), but
1042 1042 // incompatible command line options were chosen.
1043 1043
1044 1044 static void no_shared_spaces() {
1045 1045 if (RequireSharedSpaces) {
1046 1046 jio_fprintf(defaultStream::error_stream(),
1047 1047 "Class data sharing is inconsistent with other specified options.\n");
1048 1048 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1049 1049 } else {
1050 1050 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1051 1051 }
1052 1052 }
1053 1053
1054 1054 void Arguments::set_tiered_flags() {
1055 1055 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1056 1056 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1057 1057 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1058 1058 }
1059 1059 if (CompilationPolicyChoice < 2) {
1060 1060 vm_exit_during_initialization(
1061 1061 "Incompatible compilation policy selected", NULL);
1062 1062 }
1063 1063 // Increase the code cache size - tiered compiles a lot more.
1064 1064 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1065 1065 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
1066 1066 }
1067 1067 }
1068 1068
1069 1069 #ifndef KERNEL
1070 1070 static void disable_adaptive_size_policy(const char* collector_name) {
1071 1071 if (UseAdaptiveSizePolicy) {
1072 1072 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1073 1073 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1074 1074 collector_name);
1075 1075 }
1076 1076 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1077 1077 }
1078 1078 }
1079 1079
1080 1080 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
1081 1081 // if it's not explictly set or unset. If the user has chosen
1082 1082 // UseParNewGC and not explicitly set ParallelGCThreads we
1083 1083 // set it, unless this is a single cpu machine.
1084 1084 void Arguments::set_parnew_gc_flags() {
1085 1085 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1086 1086 "control point invariant");
1087 1087 assert(UseParNewGC, "Error");
1088 1088
1089 1089 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1090 1090 disable_adaptive_size_policy("UseParNewGC");
1091 1091
1092 1092 if (ParallelGCThreads == 0) {
1093 1093 FLAG_SET_DEFAULT(ParallelGCThreads,
1094 1094 Abstract_VM_Version::parallel_worker_threads());
1095 1095 if (ParallelGCThreads == 1) {
1096 1096 FLAG_SET_DEFAULT(UseParNewGC, false);
1097 1097 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
1098 1098 }
1099 1099 }
1100 1100 if (UseParNewGC) {
1101 1101 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1102 1102 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1103 1103 // we set them to 1024 and 1024.
1104 1104 // See CR 6362902.
1105 1105 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1106 1106 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1107 1107 }
1108 1108 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1109 1109 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1110 1110 }
1111 1111
1112 1112 // AlwaysTenure flag should make ParNew promote all at first collection.
1113 1113 // See CR 6362902.
1114 1114 if (AlwaysTenure) {
1115 1115 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1116 1116 }
1117 1117 // When using compressed oops, we use local overflow stacks,
1118 1118 // rather than using a global overflow list chained through
1119 1119 // the klass word of the object's pre-image.
1120 1120 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1121 1121 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1122 1122 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1123 1123 }
1124 1124 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1125 1125 }
1126 1126 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1127 1127 }
1128 1128 }
1129 1129
1130 1130 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1131 1131 // sparc/solaris for certain applications, but would gain from
1132 1132 // further optimization and tuning efforts, and would almost
1133 1133 // certainly gain from analysis of platform and environment.
1134 1134 void Arguments::set_cms_and_parnew_gc_flags() {
1135 1135 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1136 1136 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1137 1137
1138 1138 // If we are using CMS, we prefer to UseParNewGC,
1139 1139 // unless explicitly forbidden.
1140 1140 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1141 1141 FLAG_SET_ERGO(bool, UseParNewGC, true);
1142 1142 }
1143 1143
1144 1144 // Turn off AdaptiveSizePolicy for CMS until it is complete.
1145 1145 disable_adaptive_size_policy("UseConcMarkSweepGC");
1146 1146
1147 1147 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1148 1148 // as needed.
1149 1149 if (UseParNewGC) {
1150 1150 set_parnew_gc_flags();
1151 1151 }
1152 1152
1153 1153 // MaxHeapSize is aligned down in collectorPolicy
1154 1154 size_t max_heap = align_size_down(MaxHeapSize,
1155 1155 CardTableRS::ct_max_alignment_constraint());
1156 1156
1157 1157 // Now make adjustments for CMS
1158 1158 intx tenuring_default = (intx)6;
1159 1159 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1160 1160
1161 1161 // Preferred young gen size for "short" pauses:
1162 1162 // upper bound depends on # of threads and NewRatio.
1163 1163 const uintx parallel_gc_threads =
1164 1164 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1165 1165 const size_t preferred_max_new_size_unaligned =
1166 1166 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1167 1167 size_t preferred_max_new_size =
1168 1168 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1169 1169
1170 1170 // Unless explicitly requested otherwise, size young gen
1171 1171 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1172 1172
1173 1173 // If either MaxNewSize or NewRatio is set on the command line,
1174 1174 // assume the user is trying to set the size of the young gen.
1175 1175 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1176 1176
1177 1177 // Set MaxNewSize to our calculated preferred_max_new_size unless
1178 1178 // NewSize was set on the command line and it is larger than
1179 1179 // preferred_max_new_size.
1180 1180 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1181 1181 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1182 1182 } else {
1183 1183 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1184 1184 }
1185 1185 if (PrintGCDetails && Verbose) {
1186 1186 // Too early to use gclog_or_tty
1187 1187 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1188 1188 }
1189 1189
1190 1190 // Code along this path potentially sets NewSize and OldSize
1191 1191
1192 1192 assert(max_heap >= InitialHeapSize, "Error");
1193 1193 assert(max_heap >= NewSize, "Error");
1194 1194
1195 1195 if (PrintGCDetails && Verbose) {
1196 1196 // Too early to use gclog_or_tty
1197 1197 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1198 1198 " initial_heap_size: " SIZE_FORMAT
1199 1199 " max_heap: " SIZE_FORMAT,
1200 1200 min_heap_size(), InitialHeapSize, max_heap);
1201 1201 }
1202 1202 size_t min_new = preferred_max_new_size;
1203 1203 if (FLAG_IS_CMDLINE(NewSize)) {
1204 1204 min_new = NewSize;
1205 1205 }
1206 1206 if (max_heap > min_new && min_heap_size() > min_new) {
1207 1207 // Unless explicitly requested otherwise, make young gen
1208 1208 // at least min_new, and at most preferred_max_new_size.
1209 1209 if (FLAG_IS_DEFAULT(NewSize)) {
1210 1210 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1211 1211 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1212 1212 if (PrintGCDetails && Verbose) {
1213 1213 // Too early to use gclog_or_tty
1214 1214 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1215 1215 }
1216 1216 }
1217 1217 // Unless explicitly requested otherwise, size old gen
1218 1218 // so it's NewRatio x of NewSize.
1219 1219 if (FLAG_IS_DEFAULT(OldSize)) {
1220 1220 if (max_heap > NewSize) {
1221 1221 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1222 1222 if (PrintGCDetails && Verbose) {
1223 1223 // Too early to use gclog_or_tty
1224 1224 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1225 1225 }
1226 1226 }
1227 1227 }
1228 1228 }
1229 1229 }
1230 1230 // Unless explicitly requested otherwise, definitely
1231 1231 // promote all objects surviving "tenuring_default" scavenges.
1232 1232 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1233 1233 FLAG_IS_DEFAULT(SurvivorRatio)) {
1234 1234 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1235 1235 }
1236 1236 // If we decided above (or user explicitly requested)
1237 1237 // `promote all' (via MaxTenuringThreshold := 0),
1238 1238 // prefer minuscule survivor spaces so as not to waste
1239 1239 // space for (non-existent) survivors
1240 1240 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1241 1241 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1242 1242 }
1243 1243 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1244 1244 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1245 1245 // This is done in order to make ParNew+CMS configuration to work
1246 1246 // with YoungPLABSize and OldPLABSize options.
1247 1247 // See CR 6362902.
1248 1248 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1249 1249 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1250 1250 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1251 1251 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1252 1252 // the value (either from the command line or ergonomics) of
1253 1253 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1254 1254 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1255 1255 } else {
1256 1256 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1257 1257 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1258 1258 // we'll let it to take precedence.
1259 1259 jio_fprintf(defaultStream::error_stream(),
1260 1260 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1261 1261 " options are specified for the CMS collector."
1262 1262 " CMSParPromoteBlocksToClaim will take precedence.\n");
1263 1263 }
1264 1264 }
1265 1265 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1266 1266 // OldPLAB sizing manually turned off: Use a larger default setting,
1267 1267 // unless it was manually specified. This is because a too-low value
1268 1268 // will slow down scavenges.
1269 1269 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1270 1270 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1271 1271 }
1272 1272 }
1273 1273 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1274 1274 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1275 1275 // If either of the static initialization defaults have changed, note this
1276 1276 // modification.
1277 1277 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1278 1278 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1279 1279 }
1280 1280 if (PrintGCDetails && Verbose) {
1281 1281 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1282 1282 MarkStackSize / K, MarkStackSizeMax / K);
1283 1283 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1284 1284 }
1285 1285 }
1286 1286 #endif // KERNEL
1287 1287
1288 1288 void set_object_alignment() {
1289 1289 // Object alignment.
1290 1290 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1291 1291 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1292 1292 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1293 1293 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1294 1294 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1295 1295 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1296 1296
1297 1297 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1298 1298 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1299 1299
1300 1300 // Oop encoding heap max
1301 1301 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1302 1302
1303 1303 #ifndef KERNEL
1304 1304 // Set CMS global values
1305 1305 CompactibleFreeListSpace::set_cms_values();
1306 1306 #endif // KERNEL
1307 1307 }
1308 1308
1309 1309 bool verify_object_alignment() {
1310 1310 // Object alignment.
1311 1311 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1312 1312 jio_fprintf(defaultStream::error_stream(),
1313 1313 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1314 1314 (int)ObjectAlignmentInBytes);
1315 1315 return false;
1316 1316 }
1317 1317 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1318 1318 jio_fprintf(defaultStream::error_stream(),
1319 1319 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1320 1320 (int)ObjectAlignmentInBytes, BytesPerLong);
1321 1321 return false;
1322 1322 }
1323 1323 // It does not make sense to have big object alignment
1324 1324 // since a space lost due to alignment will be greater
1325 1325 // then a saved space from compressed oops.
1326 1326 if ((int)ObjectAlignmentInBytes > 256) {
1327 1327 jio_fprintf(defaultStream::error_stream(),
1328 1328 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
1329 1329 (int)ObjectAlignmentInBytes);
1330 1330 return false;
1331 1331 }
1332 1332 // In case page size is very small.
1333 1333 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1334 1334 jio_fprintf(defaultStream::error_stream(),
1335 1335 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
1336 1336 (int)ObjectAlignmentInBytes, os::vm_page_size());
1337 1337 return false;
1338 1338 }
1339 1339 return true;
1340 1340 }
1341 1341
1342 1342 inline uintx max_heap_for_compressed_oops() {
1343 1343 // Avoid sign flip.
1344 1344 if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) {
1345 1345 return 0;
1346 1346 }
1347 1347 LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size());
1348 1348 NOT_LP64(ShouldNotReachHere(); return 0);
1349 1349 }
1350 1350
1351 1351 bool Arguments::should_auto_select_low_pause_collector() {
1352 1352 if (UseAutoGCSelectPolicy &&
1353 1353 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1354 1354 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1355 1355 if (PrintGCDetails) {
1356 1356 // Cannot use gclog_or_tty yet.
1357 1357 tty->print_cr("Automatic selection of the low pause collector"
1358 1358 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1359 1359 }
1360 1360 return true;
1361 1361 }
1362 1362 return false;
1363 1363 }
1364 1364
1365 1365 void Arguments::set_ergonomics_flags() {
1366 1366
1367 1367 if (os::is_server_class_machine()) {
1368 1368 // If no other collector is requested explicitly,
1369 1369 // let the VM select the collector based on
1370 1370 // machine class and automatic selection policy.
1371 1371 if (!UseSerialGC &&
1372 1372 !UseConcMarkSweepGC &&
1373 1373 !UseG1GC &&
1374 1374 !UseParNewGC &&
1375 1375 FLAG_IS_DEFAULT(UseParallelGC)) {
1376 1376 if (should_auto_select_low_pause_collector()) {
1377 1377 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1378 1378 } else {
1379 1379 FLAG_SET_ERGO(bool, UseParallelGC, true);
1380 1380 }
1381 1381 }
1382 1382 // Shared spaces work fine with other GCs but causes bytecode rewriting
1383 1383 // to be disabled, which hurts interpreter performance and decreases
1384 1384 // server performance. On server class machines, keep the default
1385 1385 // off unless it is asked for. Future work: either add bytecode rewriting
1386 1386 // at link time, or rewrite bytecodes in non-shared methods.
1387 1387 if (!DumpSharedSpaces && !RequireSharedSpaces) {
1388 1388 no_shared_spaces();
1389 1389 }
1390 1390 }
1391 1391
1392 1392 #ifndef ZERO
1393 1393 #ifdef _LP64
1394 1394 // Check that UseCompressedOops can be set with the max heap size allocated
1395 1395 // by ergonomics.
1396 1396 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1397 1397 #if !defined(COMPILER1) || defined(TIERED)
1398 1398 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1399 1399 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1400 1400 }
1401 1401 #endif
1402 1402 #ifdef _WIN64
1403 1403 if (UseLargePages && UseCompressedOops) {
1404 1404 // Cannot allocate guard pages for implicit checks in indexed addressing
1405 1405 // mode, when large pages are specified on windows.
1406 1406 // This flag could be switched ON if narrow oop base address is set to 0,
1407 1407 // see code in Universe::initialize_heap().
1408 1408 Universe::set_narrow_oop_use_implicit_null_checks(false);
1409 1409 }
1410 1410 #endif // _WIN64
1411 1411 } else {
1412 1412 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1413 1413 warning("Max heap size too large for Compressed Oops");
1414 1414 FLAG_SET_DEFAULT(UseCompressedOops, false);
1415 1415 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1416 1416 }
1417 1417 }
1418 1418 // UseCompressedOops must be on for UseCompressedKlassPointers to be on.
1419 1419 if (!UseCompressedOops) {
1420 1420 if (UseCompressedKlassPointers) {
1421 1421 warning("UseCompressedKlassPointers requires UseCompressedOops");
1422 1422 }
1423 1423 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1424 1424 } else {
1425 1425 // Turn on UseCompressedKlassPointers too
1426 1426 // The compiler is broken for this so turn it on when the compiler is fixed.
1427 1427 // if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) {
1428 1428 // FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true);
1429 1429 // }
1430 1430 // Set the ClassMetaspaceSize to something that will not need to be
1431 1431 // expanded, since it cannot be expanded.
1432 1432 if (UseCompressedKlassPointers && FLAG_IS_DEFAULT(ClassMetaspaceSize)) {
1433 1433 // 100,000 classes seems like a good size, so 100M assumes around 1K
1434 1434 // per klass. The vtable and oopMap is embedded so we don't have a fixed
1435 1435 // size per klass. Eventually, this will be parameterized because it
1436 1436 // would also be useful to determine the optimal size of the
1437 1437 // systemDictionary.
1438 1438 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M);
1439 1439 }
1440 1440 }
1441 1441 // Also checks that certain machines are slower with compressed oops
1442 1442 // in vm_version initialization code.
1443 1443 #endif // _LP64
1444 1444 #endif // !ZERO
1445 1445 }
1446 1446
1447 1447 void Arguments::set_parallel_gc_flags() {
1448 1448 assert(UseParallelGC || UseParallelOldGC, "Error");
1449 1449 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1450 1450 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1451 1451 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1452 1452 }
1453 1453 FLAG_SET_DEFAULT(UseParallelGC, true);
1454 1454
1455 1455 // If no heap maximum was requested explicitly, use some reasonable fraction
1456 1456 // of the physical memory, up to a maximum of 1GB.
1457 1457 if (UseParallelGC) {
1458 1458 FLAG_SET_DEFAULT(ParallelGCThreads,
1459 1459 Abstract_VM_Version::parallel_worker_threads());
1460 1460
1461 1461 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1462 1462 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1463 1463 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1464 1464 // See CR 6362902 for details.
1465 1465 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1466 1466 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1467 1467 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1468 1468 }
1469 1469 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1470 1470 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1471 1471 }
1472 1472 }
1473 1473
1474 1474 if (UseParallelOldGC) {
1475 1475 // Par compact uses lower default values since they are treated as
1476 1476 // minimums. These are different defaults because of the different
1477 1477 // interpretation and are not ergonomically set.
1478 1478 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1479 1479 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1480 1480 }
1481 1481 }
1482 1482 }
1483 1483 if (UseNUMA) {
1484 1484 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
1485 1485 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
1486 1486 }
1487 1487 // For those collectors or operating systems (eg, Windows) that do
1488 1488 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
1489 1489 UseNUMAInterleaving = true;
1490 1490 }
1491 1491 }
1492 1492
1493 1493 void Arguments::set_g1_gc_flags() {
1494 1494 assert(UseG1GC, "Error");
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1495 1495 #ifdef COMPILER1
1496 1496 FastTLABRefill = false;
1497 1497 #endif
1498 1498 FLAG_SET_DEFAULT(ParallelGCThreads,
1499 1499 Abstract_VM_Version::parallel_worker_threads());
1500 1500 if (ParallelGCThreads == 0) {
1501 1501 FLAG_SET_DEFAULT(ParallelGCThreads,
1502 1502 Abstract_VM_Version::parallel_worker_threads());
1503 1503 }
1504 1504
1505 - if (FLAG_IS_DEFAULT(MarkStackSize)) {
1506 - FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1507 - }
1508 - if (PrintGCDetails && Verbose) {
1509 - tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1510 - MarkStackSize / K, MarkStackSizeMax / K);
1511 - tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1505 + // MarkStackSize will be set (if it hasn't been set by the user)
1506 + // when concurrent marking is initialized.
1507 + // Its value will be based upon the number of parallel marking threads.
1508 + // But we do set the maximum mark stack size here.
1509 + if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1510 + FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1512 1511 }
1513 1512
1514 1513 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1515 1514 // In G1, we want the default GC overhead goal to be higher than
1516 1515 // say in PS. So we set it here to 10%. Otherwise the heap might
1517 1516 // be expanded more aggressively than we would like it to. In
1518 1517 // fact, even 10% seems to not be high enough in some cases
1519 1518 // (especially small GC stress tests that the main thing they do
1520 1519 // is allocation). We might consider increase it further.
1521 1520 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1522 1521 }
1522 +
1523 + if (PrintGCDetails && Verbose) {
1524 + tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1525 + MarkStackSize / K, MarkStackSizeMax / K);
1526 + tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1527 + }
1523 1528 }
1524 1529
1525 1530 void Arguments::set_heap_size() {
1526 1531 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1527 1532 // Deprecated flag
1528 1533 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1529 1534 }
1530 1535
1531 1536 const julong phys_mem =
1532 1537 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1533 1538 : (julong)MaxRAM;
1534 1539
1535 1540 // If the maximum heap size has not been set with -Xmx,
1536 1541 // then set it as fraction of the size of physical memory,
1537 1542 // respecting the maximum and minimum sizes of the heap.
1538 1543 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1539 1544 julong reasonable_max = phys_mem / MaxRAMFraction;
1540 1545
1541 1546 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1542 1547 // Small physical memory, so use a minimum fraction of it for the heap
1543 1548 reasonable_max = phys_mem / MinRAMFraction;
1544 1549 } else {
1545 1550 // Not-small physical memory, so require a heap at least
1546 1551 // as large as MaxHeapSize
1547 1552 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1548 1553 }
1549 1554 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1550 1555 // Limit the heap size to ErgoHeapSizeLimit
1551 1556 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1552 1557 }
1553 1558 if (UseCompressedOops) {
1554 1559 // Limit the heap size to the maximum possible when using compressed oops
1555 1560 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1556 1561 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1557 1562 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1558 1563 // but it should be not less than default MaxHeapSize.
1559 1564 max_coop_heap -= HeapBaseMinAddress;
1560 1565 }
1561 1566 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1562 1567 }
1563 1568 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1564 1569
1565 1570 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1566 1571 // An initial heap size was specified on the command line,
1567 1572 // so be sure that the maximum size is consistent. Done
1568 1573 // after call to allocatable_physical_memory because that
1569 1574 // method might reduce the allocation size.
1570 1575 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1571 1576 }
1572 1577
1573 1578 if (PrintGCDetails && Verbose) {
1574 1579 // Cannot use gclog_or_tty yet.
1575 1580 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1576 1581 }
1577 1582 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1578 1583 }
1579 1584
1580 1585 // If the initial_heap_size has not been set with InitialHeapSize
1581 1586 // or -Xms, then set it as fraction of the size of physical memory,
1582 1587 // respecting the maximum and minimum sizes of the heap.
1583 1588 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1584 1589 julong reasonable_minimum = (julong)(OldSize + NewSize);
1585 1590
1586 1591 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1587 1592
1588 1593 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1589 1594
1590 1595 julong reasonable_initial = phys_mem / InitialRAMFraction;
1591 1596
1592 1597 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1593 1598 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1594 1599
1595 1600 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1596 1601
1597 1602 if (PrintGCDetails && Verbose) {
1598 1603 // Cannot use gclog_or_tty yet.
1599 1604 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1600 1605 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1601 1606 }
1602 1607 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1603 1608 set_min_heap_size((uintx)reasonable_minimum);
1604 1609 }
1605 1610 }
1606 1611
1607 1612 // This must be called after ergonomics because we want bytecode rewriting
1608 1613 // if the server compiler is used, or if UseSharedSpaces is disabled.
1609 1614 void Arguments::set_bytecode_flags() {
1610 1615 // Better not attempt to store into a read-only space.
1611 1616 if (UseSharedSpaces) {
1612 1617 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1613 1618 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1614 1619 }
1615 1620
1616 1621 if (!RewriteBytecodes) {
1617 1622 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1618 1623 }
1619 1624 }
1620 1625
1621 1626 // Aggressive optimization flags -XX:+AggressiveOpts
1622 1627 void Arguments::set_aggressive_opts_flags() {
1623 1628 #ifdef COMPILER2
1624 1629 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1625 1630 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1626 1631 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1627 1632 }
1628 1633 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1629 1634 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1630 1635 }
1631 1636
1632 1637 // Feed the cache size setting into the JDK
1633 1638 char buffer[1024];
1634 1639 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1635 1640 add_property(buffer);
1636 1641 }
1637 1642 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1638 1643 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1639 1644 }
1640 1645 #endif
1641 1646
1642 1647 if (AggressiveOpts) {
1643 1648 // Sample flag setting code
1644 1649 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1645 1650 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1646 1651 // }
1647 1652 }
1648 1653 }
1649 1654
1650 1655 //===========================================================================================================
1651 1656 // Parsing of java.compiler property
1652 1657
1653 1658 void Arguments::process_java_compiler_argument(char* arg) {
1654 1659 // For backwards compatibility, Djava.compiler=NONE or ""
1655 1660 // causes us to switch to -Xint mode UNLESS -Xdebug
1656 1661 // is also specified.
1657 1662 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1658 1663 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1659 1664 }
1660 1665 }
1661 1666
1662 1667 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1663 1668 _sun_java_launcher = strdup(launcher);
1664 1669 if (strcmp("gamma", _sun_java_launcher) == 0) {
1665 1670 _created_by_gamma_launcher = true;
1666 1671 }
1667 1672 }
1668 1673
1669 1674 bool Arguments::created_by_java_launcher() {
1670 1675 assert(_sun_java_launcher != NULL, "property must have value");
1671 1676 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1672 1677 }
1673 1678
1674 1679 bool Arguments::created_by_gamma_launcher() {
1675 1680 return _created_by_gamma_launcher;
1676 1681 }
1677 1682
1678 1683 //===========================================================================================================
1679 1684 // Parsing of main arguments
1680 1685
1681 1686 bool Arguments::verify_interval(uintx val, uintx min,
1682 1687 uintx max, const char* name) {
1683 1688 // Returns true iff value is in the inclusive interval [min..max]
1684 1689 // false, otherwise.
1685 1690 if (val >= min && val <= max) {
1686 1691 return true;
1687 1692 }
1688 1693 jio_fprintf(defaultStream::error_stream(),
1689 1694 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1690 1695 " and " UINTX_FORMAT "\n",
1691 1696 name, val, min, max);
1692 1697 return false;
1693 1698 }
1694 1699
1695 1700 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1696 1701 // Returns true if given value is at least specified min threshold
1697 1702 // false, otherwise.
1698 1703 if (val >= min ) {
1699 1704 return true;
1700 1705 }
1701 1706 jio_fprintf(defaultStream::error_stream(),
1702 1707 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1703 1708 name, val, min);
1704 1709 return false;
1705 1710 }
1706 1711
1707 1712 bool Arguments::verify_percentage(uintx value, const char* name) {
1708 1713 if (value <= 100) {
1709 1714 return true;
1710 1715 }
1711 1716 jio_fprintf(defaultStream::error_stream(),
1712 1717 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1713 1718 name, value);
1714 1719 return false;
1715 1720 }
1716 1721
1717 1722 static void force_serial_gc() {
1718 1723 FLAG_SET_DEFAULT(UseSerialGC, true);
1719 1724 FLAG_SET_DEFAULT(UseParNewGC, false);
1720 1725 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1721 1726 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1722 1727 FLAG_SET_DEFAULT(UseParallelGC, false);
1723 1728 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1724 1729 FLAG_SET_DEFAULT(UseG1GC, false);
1725 1730 }
1726 1731
1727 1732 static bool verify_serial_gc_flags() {
1728 1733 return (UseSerialGC &&
1729 1734 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1730 1735 UseParallelGC || UseParallelOldGC));
1731 1736 }
1732 1737
1733 1738 // check if do gclog rotation
1734 1739 // +UseGCLogFileRotation is a must,
1735 1740 // no gc log rotation when log file not supplied or
1736 1741 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1737 1742 void check_gclog_consistency() {
1738 1743 if (UseGCLogFileRotation) {
1739 1744 if ((Arguments::gc_log_filename() == NULL) ||
1740 1745 (NumberOfGCLogFiles == 0) ||
1741 1746 (GCLogFileSize == 0)) {
1742 1747 jio_fprintf(defaultStream::output_stream(),
1743 1748 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1744 1749 "where num_of_file > 0 and num_of_size > 0\n"
1745 1750 "GC log rotation is turned off\n");
1746 1751 UseGCLogFileRotation = false;
1747 1752 }
1748 1753 }
1749 1754
1750 1755 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1751 1756 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1752 1757 jio_fprintf(defaultStream::output_stream(),
1753 1758 "GCLogFileSize changed to minimum 8K\n");
1754 1759 }
1755 1760 }
1756 1761
1757 1762 // Check consistency of GC selection
1758 1763 bool Arguments::check_gc_consistency() {
1759 1764 check_gclog_consistency();
1760 1765 bool status = true;
1761 1766 // Ensure that the user has not selected conflicting sets
1762 1767 // of collectors. [Note: this check is merely a user convenience;
1763 1768 // collectors over-ride each other so that only a non-conflicting
1764 1769 // set is selected; however what the user gets is not what they
1765 1770 // may have expected from the combination they asked for. It's
1766 1771 // better to reduce user confusion by not allowing them to
1767 1772 // select conflicting combinations.
1768 1773 uint i = 0;
1769 1774 if (UseSerialGC) i++;
1770 1775 if (UseConcMarkSweepGC || UseParNewGC) i++;
1771 1776 if (UseParallelGC || UseParallelOldGC) i++;
1772 1777 if (UseG1GC) i++;
1773 1778 if (i > 1) {
1774 1779 jio_fprintf(defaultStream::error_stream(),
1775 1780 "Conflicting collector combinations in option list; "
1776 1781 "please refer to the release notes for the combinations "
1777 1782 "allowed\n");
1778 1783 status = false;
1779 1784 }
1780 1785
1781 1786 return status;
1782 1787 }
1783 1788
1784 1789 // Check stack pages settings
1785 1790 bool Arguments::check_stack_pages()
1786 1791 {
1787 1792 bool status = true;
1788 1793 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1789 1794 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1790 1795 // greater stack shadow pages can't generate instruction to bang stack
1791 1796 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1792 1797 return status;
1793 1798 }
1794 1799
1795 1800 // Check the consistency of vm_init_args
1796 1801 bool Arguments::check_vm_args_consistency() {
1797 1802 // Method for adding checks for flag consistency.
1798 1803 // The intent is to warn the user of all possible conflicts,
1799 1804 // before returning an error.
1800 1805 // Note: Needs platform-dependent factoring.
1801 1806 bool status = true;
1802 1807
1803 1808 #if ( (defined(COMPILER2) && defined(SPARC)))
1804 1809 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1805 1810 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1806 1811 // x86. Normally, VM_Version_init must be called from init_globals in
1807 1812 // init.cpp, which is called by the initial java thread *after* arguments
1808 1813 // have been parsed. VM_Version_init gets called twice on sparc.
1809 1814 extern void VM_Version_init();
1810 1815 VM_Version_init();
1811 1816 if (!VM_Version::has_v9()) {
1812 1817 jio_fprintf(defaultStream::error_stream(),
1813 1818 "V8 Machine detected, Server requires V9\n");
1814 1819 status = false;
1815 1820 }
1816 1821 #endif /* COMPILER2 && SPARC */
1817 1822
1818 1823 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1819 1824 // builds so the cost of stack banging can be measured.
1820 1825 #if (defined(PRODUCT) && defined(SOLARIS))
1821 1826 if (!UseBoundThreads && !UseStackBanging) {
1822 1827 jio_fprintf(defaultStream::error_stream(),
1823 1828 "-UseStackBanging conflicts with -UseBoundThreads\n");
1824 1829
1825 1830 status = false;
1826 1831 }
1827 1832 #endif
1828 1833
1829 1834 if (TLABRefillWasteFraction == 0) {
1830 1835 jio_fprintf(defaultStream::error_stream(),
1831 1836 "TLABRefillWasteFraction should be a denominator, "
1832 1837 "not " SIZE_FORMAT "\n",
1833 1838 TLABRefillWasteFraction);
1834 1839 status = false;
1835 1840 }
1836 1841
1837 1842 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1838 1843 "AdaptiveSizePolicyWeight");
1839 1844 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1840 1845 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1841 1846 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1842 1847
1843 1848 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1844 1849 jio_fprintf(defaultStream::error_stream(),
1845 1850 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1846 1851 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1847 1852 MinHeapFreeRatio, MaxHeapFreeRatio);
1848 1853 status = false;
1849 1854 }
1850 1855 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1851 1856 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1852 1857
1853 1858 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1854 1859 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1855 1860 }
1856 1861
1857 1862 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1858 1863 // Settings to encourage splitting.
1859 1864 if (!FLAG_IS_CMDLINE(NewRatio)) {
1860 1865 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1861 1866 }
1862 1867 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1863 1868 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1864 1869 }
1865 1870 }
1866 1871
1867 1872 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1868 1873 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1869 1874 if (GCTimeLimit == 100) {
1870 1875 // Turn off gc-overhead-limit-exceeded checks
1871 1876 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1872 1877 }
1873 1878
1874 1879 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1875 1880
1876 1881 status = status && check_gc_consistency();
1877 1882 status = status && check_stack_pages();
1878 1883
1879 1884 if (_has_alloc_profile) {
1880 1885 if (UseParallelGC || UseParallelOldGC) {
1881 1886 jio_fprintf(defaultStream::error_stream(),
1882 1887 "error: invalid argument combination.\n"
1883 1888 "Allocation profiling (-Xaprof) cannot be used together with "
1884 1889 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1885 1890 status = false;
1886 1891 }
1887 1892 if (UseConcMarkSweepGC) {
1888 1893 jio_fprintf(defaultStream::error_stream(),
1889 1894 "error: invalid argument combination.\n"
1890 1895 "Allocation profiling (-Xaprof) cannot be used together with "
1891 1896 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1892 1897 status = false;
1893 1898 }
1894 1899 }
1895 1900
1896 1901 if (CMSIncrementalMode) {
1897 1902 if (!UseConcMarkSweepGC) {
1898 1903 jio_fprintf(defaultStream::error_stream(),
1899 1904 "error: invalid argument combination.\n"
1900 1905 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1901 1906 "selected in order\nto use CMSIncrementalMode.\n");
1902 1907 status = false;
1903 1908 } else {
1904 1909 status = status && verify_percentage(CMSIncrementalDutyCycle,
1905 1910 "CMSIncrementalDutyCycle");
1906 1911 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1907 1912 "CMSIncrementalDutyCycleMin");
1908 1913 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1909 1914 "CMSIncrementalSafetyFactor");
1910 1915 status = status && verify_percentage(CMSIncrementalOffset,
1911 1916 "CMSIncrementalOffset");
1912 1917 status = status && verify_percentage(CMSExpAvgFactor,
1913 1918 "CMSExpAvgFactor");
1914 1919 // If it was not set on the command line, set
1915 1920 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1916 1921 if (CMSInitiatingOccupancyFraction < 0) {
1917 1922 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1918 1923 }
1919 1924 }
1920 1925 }
1921 1926
1922 1927 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1923 1928 // insists that we hold the requisite locks so that the iteration is
1924 1929 // MT-safe. For the verification at start-up and shut-down, we don't
1925 1930 // yet have a good way of acquiring and releasing these locks,
1926 1931 // which are not visible at the CollectedHeap level. We want to
1927 1932 // be able to acquire these locks and then do the iteration rather
1928 1933 // than just disable the lock verification. This will be fixed under
1929 1934 // bug 4788986.
1930 1935 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1931 1936 if (VerifyGCStartAt == 0) {
1932 1937 warning("Heap verification at start-up disabled "
1933 1938 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1934 1939 VerifyGCStartAt = 1; // Disable verification at start-up
1935 1940 }
1936 1941 if (VerifyBeforeExit) {
1937 1942 warning("Heap verification at shutdown disabled "
1938 1943 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1939 1944 VerifyBeforeExit = false; // Disable verification at shutdown
1940 1945 }
1941 1946 }
1942 1947
1943 1948 // Note: only executed in non-PRODUCT mode
1944 1949 if (!UseAsyncConcMarkSweepGC &&
1945 1950 (ExplicitGCInvokesConcurrent ||
1946 1951 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1947 1952 jio_fprintf(defaultStream::error_stream(),
1948 1953 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1949 1954 " with -UseAsyncConcMarkSweepGC");
1950 1955 status = false;
1951 1956 }
1952 1957
1953 1958 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
1954 1959
1955 1960 #ifndef SERIALGC
1956 1961 if (UseG1GC) {
1957 1962 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1958 1963 "InitiatingHeapOccupancyPercent");
1959 1964 status = status && verify_min_value(G1RefProcDrainInterval, 1,
1960 1965 "G1RefProcDrainInterval");
1961 1966 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
1962 1967 "G1ConcMarkStepDurationMillis");
1963 1968 }
1964 1969 #endif
1965 1970
1966 1971 status = status && verify_interval(RefDiscoveryPolicy,
1967 1972 ReferenceProcessor::DiscoveryPolicyMin,
1968 1973 ReferenceProcessor::DiscoveryPolicyMax,
1969 1974 "RefDiscoveryPolicy");
1970 1975
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1971 1976 // Limit the lower bound of this flag to 1 as it is used in a division
1972 1977 // expression.
1973 1978 status = status && verify_interval(TLABWasteTargetPercent,
1974 1979 1, 100, "TLABWasteTargetPercent");
1975 1980
1976 1981 status = status && verify_object_alignment();
1977 1982
1978 1983 status = status && verify_min_value(ClassMetaspaceSize, 1*M,
1979 1984 "ClassMetaspaceSize");
1980 1985
1986 + status = status && verify_interval(MarkStackSizeMax,
1987 + 1, (max_jint - 1), "MarkStackSizeMax");
1988 +
1981 1989 #ifdef SPARC
1982 1990 if (UseConcMarkSweepGC || UseG1GC) {
1983 1991 // Issue a stern warning if the user has explicitly set
1984 1992 // UseMemSetInBOT (it is known to cause issues), but allow
1985 1993 // use for experimentation and debugging.
1986 1994 if (VM_Version::is_sun4v() && UseMemSetInBOT) {
1987 1995 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
1988 1996 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
1989 1997 " on sun4v; please understand that you are using at your own risk!");
1990 1998 }
1991 1999 }
1992 2000 #endif // SPARC
1993 2001
1994 2002 if (PrintNMTStatistics && MemTracker::tracking_level() == MemTracker::NMT_off) {
1995 2003 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
1996 2004 PrintNMTStatistics = false;
1997 2005 }
1998 2006
1999 2007 return status;
2000 2008 }
2001 2009
2002 2010 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2003 2011 const char* option_type) {
2004 2012 if (ignore) return false;
2005 2013
2006 2014 const char* spacer = " ";
2007 2015 if (option_type == NULL) {
2008 2016 option_type = ++spacer; // Set both to the empty string.
2009 2017 }
2010 2018
2011 2019 if (os::obsolete_option(option)) {
2012 2020 jio_fprintf(defaultStream::error_stream(),
2013 2021 "Obsolete %s%soption: %s\n", option_type, spacer,
2014 2022 option->optionString);
2015 2023 return false;
2016 2024 } else {
2017 2025 jio_fprintf(defaultStream::error_stream(),
2018 2026 "Unrecognized %s%soption: %s\n", option_type, spacer,
2019 2027 option->optionString);
2020 2028 return true;
2021 2029 }
2022 2030 }
2023 2031
2024 2032 static const char* user_assertion_options[] = {
2025 2033 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2026 2034 };
2027 2035
2028 2036 static const char* system_assertion_options[] = {
2029 2037 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2030 2038 };
2031 2039
2032 2040 // Return true if any of the strings in null-terminated array 'names' matches.
2033 2041 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2034 2042 // the option must match exactly.
2035 2043 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2036 2044 bool tail_allowed) {
2037 2045 for (/* empty */; *names != NULL; ++names) {
2038 2046 if (match_option(option, *names, tail)) {
2039 2047 if (**tail == '\0' || tail_allowed && **tail == ':') {
2040 2048 return true;
2041 2049 }
2042 2050 }
2043 2051 }
2044 2052 return false;
2045 2053 }
2046 2054
2047 2055 bool Arguments::parse_uintx(const char* value,
2048 2056 uintx* uintx_arg,
2049 2057 uintx min_size) {
2050 2058
2051 2059 // Check the sign first since atomull() parses only unsigned values.
2052 2060 bool value_is_positive = !(*value == '-');
2053 2061
2054 2062 if (value_is_positive) {
2055 2063 julong n;
2056 2064 bool good_return = atomull(value, &n);
2057 2065 if (good_return) {
2058 2066 bool above_minimum = n >= min_size;
2059 2067 bool value_is_too_large = n > max_uintx;
2060 2068
2061 2069 if (above_minimum && !value_is_too_large) {
2062 2070 *uintx_arg = n;
2063 2071 return true;
2064 2072 }
2065 2073 }
2066 2074 }
2067 2075 return false;
2068 2076 }
2069 2077
2070 2078 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2071 2079 julong* long_arg,
2072 2080 julong min_size) {
2073 2081 if (!atomull(s, long_arg)) return arg_unreadable;
2074 2082 return check_memory_size(*long_arg, min_size);
2075 2083 }
2076 2084
2077 2085 // Parse JavaVMInitArgs structure
2078 2086
2079 2087 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2080 2088 // For components of the system classpath.
2081 2089 SysClassPath scp(Arguments::get_sysclasspath());
2082 2090 bool scp_assembly_required = false;
2083 2091
2084 2092 // Save default settings for some mode flags
2085 2093 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2086 2094 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2087 2095 Arguments::_ClipInlining = ClipInlining;
2088 2096 Arguments::_BackgroundCompilation = BackgroundCompilation;
2089 2097
2090 2098 // Setup flags for mixed which is the default
2091 2099 set_mode_flags(_mixed);
2092 2100
2093 2101 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2094 2102 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2095 2103 if (result != JNI_OK) {
2096 2104 return result;
2097 2105 }
2098 2106
2099 2107 // Parse JavaVMInitArgs structure passed in
2100 2108 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2101 2109 if (result != JNI_OK) {
2102 2110 return result;
2103 2111 }
2104 2112
2105 2113 if (AggressiveOpts) {
2106 2114 // Insert alt-rt.jar between user-specified bootclasspath
2107 2115 // prefix and the default bootclasspath. os::set_boot_path()
2108 2116 // uses meta_index_dir as the default bootclasspath directory.
2109 2117 const char* altclasses_jar = "alt-rt.jar";
2110 2118 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2111 2119 strlen(altclasses_jar);
2112 2120 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal);
2113 2121 strcpy(altclasses_path, get_meta_index_dir());
2114 2122 strcat(altclasses_path, altclasses_jar);
2115 2123 scp.add_suffix_to_prefix(altclasses_path);
2116 2124 scp_assembly_required = true;
2117 2125 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal);
2118 2126 }
2119 2127
2120 2128 if (WhiteBoxAPI) {
2121 2129 // Append wb.jar to bootclasspath if enabled
2122 2130 const char* wb_jar = "wb.jar";
2123 2131 size_t wb_path_len = strlen(get_meta_index_dir()) + 1 +
2124 2132 strlen(wb_jar);
2125 2133 char* wb_path = NEW_C_HEAP_ARRAY(char, wb_path_len, mtInternal);
2126 2134 strcpy(wb_path, get_meta_index_dir());
2127 2135 strcat(wb_path, wb_jar);
2128 2136 scp.add_suffix(wb_path);
2129 2137 scp_assembly_required = true;
2130 2138 FREE_C_HEAP_ARRAY(char, wb_path, mtInternal);
2131 2139 }
2132 2140
2133 2141 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2134 2142 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2135 2143 if (result != JNI_OK) {
2136 2144 return result;
2137 2145 }
2138 2146
2139 2147 // Do final processing now that all arguments have been parsed
2140 2148 result = finalize_vm_init_args(&scp, scp_assembly_required);
2141 2149 if (result != JNI_OK) {
2142 2150 return result;
2143 2151 }
2144 2152
2145 2153 return JNI_OK;
2146 2154 }
2147 2155
2148 2156 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2149 2157 SysClassPath* scp_p,
2150 2158 bool* scp_assembly_required_p,
2151 2159 FlagValueOrigin origin) {
2152 2160 // Remaining part of option string
2153 2161 const char* tail;
2154 2162
2155 2163 // iterate over arguments
2156 2164 for (int index = 0; index < args->nOptions; index++) {
2157 2165 bool is_absolute_path = false; // for -agentpath vs -agentlib
2158 2166
2159 2167 const JavaVMOption* option = args->options + index;
2160 2168
2161 2169 if (!match_option(option, "-Djava.class.path", &tail) &&
2162 2170 !match_option(option, "-Dsun.java.command", &tail) &&
2163 2171 !match_option(option, "-Dsun.java.launcher", &tail)) {
2164 2172
2165 2173 // add all jvm options to the jvm_args string. This string
2166 2174 // is used later to set the java.vm.args PerfData string constant.
2167 2175 // the -Djava.class.path and the -Dsun.java.command options are
2168 2176 // omitted from jvm_args string as each have their own PerfData
2169 2177 // string constant object.
2170 2178 build_jvm_args(option->optionString);
2171 2179 }
2172 2180
2173 2181 // -verbose:[class/gc/jni]
2174 2182 if (match_option(option, "-verbose", &tail)) {
2175 2183 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2176 2184 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2177 2185 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2178 2186 } else if (!strcmp(tail, ":gc")) {
2179 2187 FLAG_SET_CMDLINE(bool, PrintGC, true);
2180 2188 } else if (!strcmp(tail, ":jni")) {
2181 2189 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2182 2190 }
2183 2191 // -da / -ea / -disableassertions / -enableassertions
2184 2192 // These accept an optional class/package name separated by a colon, e.g.,
2185 2193 // -da:java.lang.Thread.
2186 2194 } else if (match_option(option, user_assertion_options, &tail, true)) {
2187 2195 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2188 2196 if (*tail == '\0') {
2189 2197 JavaAssertions::setUserClassDefault(enable);
2190 2198 } else {
2191 2199 assert(*tail == ':', "bogus match by match_option()");
2192 2200 JavaAssertions::addOption(tail + 1, enable);
2193 2201 }
2194 2202 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2195 2203 } else if (match_option(option, system_assertion_options, &tail, false)) {
2196 2204 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2197 2205 JavaAssertions::setSystemClassDefault(enable);
2198 2206 // -bootclasspath:
2199 2207 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2200 2208 scp_p->reset_path(tail);
2201 2209 *scp_assembly_required_p = true;
2202 2210 // -bootclasspath/a:
2203 2211 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2204 2212 scp_p->add_suffix(tail);
2205 2213 *scp_assembly_required_p = true;
2206 2214 // -bootclasspath/p:
2207 2215 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2208 2216 scp_p->add_prefix(tail);
2209 2217 *scp_assembly_required_p = true;
2210 2218 // -Xrun
2211 2219 } else if (match_option(option, "-Xrun", &tail)) {
2212 2220 if (tail != NULL) {
2213 2221 const char* pos = strchr(tail, ':');
2214 2222 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2215 2223 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2216 2224 name[len] = '\0';
2217 2225
2218 2226 char *options = NULL;
2219 2227 if(pos != NULL) {
2220 2228 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2221 2229 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2222 2230 }
2223 2231 #ifdef JVMTI_KERNEL
2224 2232 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2225 2233 warning("profiling and debugging agents are not supported with Kernel VM");
2226 2234 } else
2227 2235 #endif // JVMTI_KERNEL
2228 2236 add_init_library(name, options);
2229 2237 }
2230 2238 // -agentlib and -agentpath
2231 2239 } else if (match_option(option, "-agentlib:", &tail) ||
2232 2240 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2233 2241 if(tail != NULL) {
2234 2242 const char* pos = strchr(tail, '=');
2235 2243 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2236 2244 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2237 2245 name[len] = '\0';
2238 2246
2239 2247 char *options = NULL;
2240 2248 if(pos != NULL) {
2241 2249 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2242 2250 }
2243 2251 #ifdef JVMTI_KERNEL
2244 2252 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2245 2253 warning("profiling and debugging agents are not supported with Kernel VM");
2246 2254 } else
2247 2255 #endif // JVMTI_KERNEL
2248 2256 add_init_agent(name, options, is_absolute_path);
2249 2257
2250 2258 }
2251 2259 // -javaagent
2252 2260 } else if (match_option(option, "-javaagent:", &tail)) {
2253 2261 if(tail != NULL) {
2254 2262 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2255 2263 add_init_agent("instrument", options, false);
2256 2264 }
2257 2265 // -Xnoclassgc
2258 2266 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2259 2267 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2260 2268 // -Xincgc: i-CMS
2261 2269 } else if (match_option(option, "-Xincgc", &tail)) {
2262 2270 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2263 2271 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2264 2272 // -Xnoincgc: no i-CMS
2265 2273 } else if (match_option(option, "-Xnoincgc", &tail)) {
2266 2274 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2267 2275 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2268 2276 // -Xconcgc
2269 2277 } else if (match_option(option, "-Xconcgc", &tail)) {
2270 2278 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2271 2279 // -Xnoconcgc
2272 2280 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2273 2281 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2274 2282 // -Xbatch
2275 2283 } else if (match_option(option, "-Xbatch", &tail)) {
2276 2284 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2277 2285 // -Xmn for compatibility with other JVM vendors
2278 2286 } else if (match_option(option, "-Xmn", &tail)) {
2279 2287 julong long_initial_eden_size = 0;
2280 2288 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2281 2289 if (errcode != arg_in_range) {
2282 2290 jio_fprintf(defaultStream::error_stream(),
2283 2291 "Invalid initial eden size: %s\n", option->optionString);
2284 2292 describe_range_error(errcode);
2285 2293 return JNI_EINVAL;
2286 2294 }
2287 2295 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2288 2296 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2289 2297 // -Xms
2290 2298 } else if (match_option(option, "-Xms", &tail)) {
2291 2299 julong long_initial_heap_size = 0;
2292 2300 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2293 2301 if (errcode != arg_in_range) {
2294 2302 jio_fprintf(defaultStream::error_stream(),
2295 2303 "Invalid initial heap size: %s\n", option->optionString);
2296 2304 describe_range_error(errcode);
2297 2305 return JNI_EINVAL;
2298 2306 }
2299 2307 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2300 2308 // Currently the minimum size and the initial heap sizes are the same.
2301 2309 set_min_heap_size(InitialHeapSize);
2302 2310 // -Xmx
2303 2311 } else if (match_option(option, "-Xmx", &tail)) {
2304 2312 julong long_max_heap_size = 0;
2305 2313 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2306 2314 if (errcode != arg_in_range) {
2307 2315 jio_fprintf(defaultStream::error_stream(),
2308 2316 "Invalid maximum heap size: %s\n", option->optionString);
2309 2317 describe_range_error(errcode);
2310 2318 return JNI_EINVAL;
2311 2319 }
2312 2320 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2313 2321 // Xmaxf
2314 2322 } else if (match_option(option, "-Xmaxf", &tail)) {
2315 2323 int maxf = (int)(atof(tail) * 100);
2316 2324 if (maxf < 0 || maxf > 100) {
2317 2325 jio_fprintf(defaultStream::error_stream(),
2318 2326 "Bad max heap free percentage size: %s\n",
2319 2327 option->optionString);
2320 2328 return JNI_EINVAL;
2321 2329 } else {
2322 2330 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2323 2331 }
2324 2332 // Xminf
2325 2333 } else if (match_option(option, "-Xminf", &tail)) {
2326 2334 int minf = (int)(atof(tail) * 100);
2327 2335 if (minf < 0 || minf > 100) {
2328 2336 jio_fprintf(defaultStream::error_stream(),
2329 2337 "Bad min heap free percentage size: %s\n",
2330 2338 option->optionString);
2331 2339 return JNI_EINVAL;
2332 2340 } else {
2333 2341 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2334 2342 }
2335 2343 // -Xss
2336 2344 } else if (match_option(option, "-Xss", &tail)) {
2337 2345 julong long_ThreadStackSize = 0;
2338 2346 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2339 2347 if (errcode != arg_in_range) {
2340 2348 jio_fprintf(defaultStream::error_stream(),
2341 2349 "Invalid thread stack size: %s\n", option->optionString);
2342 2350 describe_range_error(errcode);
2343 2351 return JNI_EINVAL;
2344 2352 }
2345 2353 // Internally track ThreadStackSize in units of 1024 bytes.
2346 2354 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2347 2355 round_to((int)long_ThreadStackSize, K) / K);
2348 2356 // -Xoss
2349 2357 } else if (match_option(option, "-Xoss", &tail)) {
2350 2358 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2351 2359 // -Xmaxjitcodesize
2352 2360 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2353 2361 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2354 2362 julong long_ReservedCodeCacheSize = 0;
2355 2363 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2356 2364 (size_t)InitialCodeCacheSize);
2357 2365 if (errcode != arg_in_range) {
2358 2366 jio_fprintf(defaultStream::error_stream(),
2359 2367 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2360 2368 option->optionString, InitialCodeCacheSize/K);
2361 2369 describe_range_error(errcode);
2362 2370 return JNI_EINVAL;
2363 2371 }
2364 2372 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2365 2373 // -green
2366 2374 } else if (match_option(option, "-green", &tail)) {
2367 2375 jio_fprintf(defaultStream::error_stream(),
2368 2376 "Green threads support not available\n");
2369 2377 return JNI_EINVAL;
2370 2378 // -native
2371 2379 } else if (match_option(option, "-native", &tail)) {
2372 2380 // HotSpot always uses native threads, ignore silently for compatibility
2373 2381 // -Xsqnopause
2374 2382 } else if (match_option(option, "-Xsqnopause", &tail)) {
2375 2383 // EVM option, ignore silently for compatibility
2376 2384 // -Xrs
2377 2385 } else if (match_option(option, "-Xrs", &tail)) {
2378 2386 // Classic/EVM option, new functionality
2379 2387 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2380 2388 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2381 2389 // change default internal VM signals used - lower case for back compat
2382 2390 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2383 2391 // -Xoptimize
2384 2392 } else if (match_option(option, "-Xoptimize", &tail)) {
2385 2393 // EVM option, ignore silently for compatibility
2386 2394 // -Xprof
2387 2395 } else if (match_option(option, "-Xprof", &tail)) {
2388 2396 #ifndef FPROF_KERNEL
2389 2397 _has_profile = true;
2390 2398 #else // FPROF_KERNEL
2391 2399 // do we have to exit?
2392 2400 warning("Kernel VM does not support flat profiling.");
2393 2401 #endif // FPROF_KERNEL
2394 2402 // -Xaprof
2395 2403 } else if (match_option(option, "-Xaprof", &tail)) {
2396 2404 _has_alloc_profile = true;
2397 2405 // -Xconcurrentio
2398 2406 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2399 2407 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2400 2408 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2401 2409 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2402 2410 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2403 2411 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2404 2412
2405 2413 // -Xinternalversion
2406 2414 } else if (match_option(option, "-Xinternalversion", &tail)) {
2407 2415 jio_fprintf(defaultStream::output_stream(), "%s\n",
2408 2416 VM_Version::internal_vm_info_string());
2409 2417 vm_exit(0);
2410 2418 #ifndef PRODUCT
2411 2419 // -Xprintflags
2412 2420 } else if (match_option(option, "-Xprintflags", &tail)) {
2413 2421 CommandLineFlags::printFlags(tty, false);
2414 2422 vm_exit(0);
2415 2423 #endif
2416 2424 // -D
2417 2425 } else if (match_option(option, "-D", &tail)) {
2418 2426 if (!add_property(tail)) {
2419 2427 return JNI_ENOMEM;
2420 2428 }
2421 2429 // Out of the box management support
2422 2430 if (match_option(option, "-Dcom.sun.management", &tail)) {
2423 2431 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2424 2432 }
2425 2433 // -Xint
2426 2434 } else if (match_option(option, "-Xint", &tail)) {
2427 2435 set_mode_flags(_int);
2428 2436 // -Xmixed
2429 2437 } else if (match_option(option, "-Xmixed", &tail)) {
2430 2438 set_mode_flags(_mixed);
2431 2439 // -Xcomp
2432 2440 } else if (match_option(option, "-Xcomp", &tail)) {
2433 2441 // for testing the compiler; turn off all flags that inhibit compilation
2434 2442 set_mode_flags(_comp);
2435 2443
2436 2444 // -Xshare:dump
2437 2445 } else if (match_option(option, "-Xshare:dump", &tail)) {
2438 2446 #if defined(KERNEL)
2439 2447 vm_exit_during_initialization(
2440 2448 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2441 2449 #else
2442 2450 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2443 2451 set_mode_flags(_int); // Prevent compilation, which creates objects
2444 2452 #endif
2445 2453 // -Xshare:on
2446 2454 } else if (match_option(option, "-Xshare:on", &tail)) {
2447 2455 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2448 2456 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2449 2457 // -Xshare:auto
2450 2458 } else if (match_option(option, "-Xshare:auto", &tail)) {
2451 2459 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2452 2460 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2453 2461 // -Xshare:off
2454 2462 } else if (match_option(option, "-Xshare:off", &tail)) {
2455 2463 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2456 2464 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2457 2465
2458 2466 // -Xverify
2459 2467 } else if (match_option(option, "-Xverify", &tail)) {
2460 2468 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2461 2469 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2462 2470 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2463 2471 } else if (strcmp(tail, ":remote") == 0) {
2464 2472 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2465 2473 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2466 2474 } else if (strcmp(tail, ":none") == 0) {
2467 2475 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2468 2476 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2469 2477 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2470 2478 return JNI_EINVAL;
2471 2479 }
2472 2480 // -Xdebug
2473 2481 } else if (match_option(option, "-Xdebug", &tail)) {
2474 2482 // note this flag has been used, then ignore
2475 2483 set_xdebug_mode(true);
2476 2484 // -Xnoagent
2477 2485 } else if (match_option(option, "-Xnoagent", &tail)) {
2478 2486 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2479 2487 } else if (match_option(option, "-Xboundthreads", &tail)) {
2480 2488 // Bind user level threads to kernel threads (Solaris only)
2481 2489 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2482 2490 } else if (match_option(option, "-Xloggc:", &tail)) {
2483 2491 // Redirect GC output to the file. -Xloggc:<filename>
2484 2492 // ostream_init_log(), when called will use this filename
2485 2493 // to initialize a fileStream.
2486 2494 _gc_log_filename = strdup(tail);
2487 2495 FLAG_SET_CMDLINE(bool, PrintGC, true);
2488 2496 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2489 2497
2490 2498 // JNI hooks
2491 2499 } else if (match_option(option, "-Xcheck", &tail)) {
2492 2500 if (!strcmp(tail, ":jni")) {
2493 2501 CheckJNICalls = true;
2494 2502 } else if (is_bad_option(option, args->ignoreUnrecognized,
2495 2503 "check")) {
2496 2504 return JNI_EINVAL;
2497 2505 }
2498 2506 } else if (match_option(option, "vfprintf", &tail)) {
2499 2507 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2500 2508 } else if (match_option(option, "exit", &tail)) {
2501 2509 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2502 2510 } else if (match_option(option, "abort", &tail)) {
2503 2511 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2504 2512 // -XX:+AggressiveHeap
2505 2513 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2506 2514
2507 2515 // This option inspects the machine and attempts to set various
2508 2516 // parameters to be optimal for long-running, memory allocation
2509 2517 // intensive jobs. It is intended for machines with large
2510 2518 // amounts of cpu and memory.
2511 2519
2512 2520 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2513 2521 // VM, but we may not be able to represent the total physical memory
2514 2522 // available (like having 8gb of memory on a box but using a 32bit VM).
2515 2523 // Thus, we need to make sure we're using a julong for intermediate
2516 2524 // calculations.
2517 2525 julong initHeapSize;
2518 2526 julong total_memory = os::physical_memory();
2519 2527
2520 2528 if (total_memory < (julong)256*M) {
2521 2529 jio_fprintf(defaultStream::error_stream(),
2522 2530 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2523 2531 vm_exit(1);
2524 2532 }
2525 2533
2526 2534 // The heap size is half of available memory, or (at most)
2527 2535 // all of possible memory less 160mb (leaving room for the OS
2528 2536 // when using ISM). This is the maximum; because adaptive sizing
2529 2537 // is turned on below, the actual space used may be smaller.
2530 2538
2531 2539 initHeapSize = MIN2(total_memory / (julong)2,
2532 2540 total_memory - (julong)160*M);
2533 2541
2534 2542 // Make sure that if we have a lot of memory we cap the 32 bit
2535 2543 // process space. The 64bit VM version of this function is a nop.
2536 2544 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2537 2545
2538 2546 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2539 2547 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2540 2548 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2541 2549 // Currently the minimum size and the initial heap sizes are the same.
2542 2550 set_min_heap_size(initHeapSize);
2543 2551 }
2544 2552 if (FLAG_IS_DEFAULT(NewSize)) {
2545 2553 // Make the young generation 3/8ths of the total heap.
2546 2554 FLAG_SET_CMDLINE(uintx, NewSize,
2547 2555 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2548 2556 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2549 2557 }
2550 2558
2551 2559 FLAG_SET_DEFAULT(UseLargePages, true);
2552 2560
2553 2561 // Increase some data structure sizes for efficiency
2554 2562 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2555 2563 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2556 2564 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2557 2565
2558 2566 // See the OldPLABSize comment below, but replace 'after promotion'
2559 2567 // with 'after copying'. YoungPLABSize is the size of the survivor
2560 2568 // space per-gc-thread buffers. The default is 4kw.
2561 2569 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2562 2570
2563 2571 // OldPLABSize is the size of the buffers in the old gen that
2564 2572 // UseParallelGC uses to promote live data that doesn't fit in the
2565 2573 // survivor spaces. At any given time, there's one for each gc thread.
2566 2574 // The default size is 1kw. These buffers are rarely used, since the
2567 2575 // survivor spaces are usually big enough. For specjbb, however, there
2568 2576 // are occasions when there's lots of live data in the young gen
2569 2577 // and we end up promoting some of it. We don't have a definite
2570 2578 // explanation for why bumping OldPLABSize helps, but the theory
2571 2579 // is that a bigger PLAB results in retaining something like the
2572 2580 // original allocation order after promotion, which improves mutator
2573 2581 // locality. A minor effect may be that larger PLABs reduce the
2574 2582 // number of PLAB allocation events during gc. The value of 8kw
2575 2583 // was arrived at by experimenting with specjbb.
2576 2584 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2577 2585
2578 2586 // Enable parallel GC and adaptive generation sizing
2579 2587 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2580 2588 FLAG_SET_DEFAULT(ParallelGCThreads,
2581 2589 Abstract_VM_Version::parallel_worker_threads());
2582 2590
2583 2591 // Encourage steady state memory management
2584 2592 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2585 2593
2586 2594 // This appears to improve mutator locality
2587 2595 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2588 2596
2589 2597 // Get around early Solaris scheduling bug
2590 2598 // (affinity vs other jobs on system)
2591 2599 // but disallow DR and offlining (5008695).
2592 2600 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2593 2601
2594 2602 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2595 2603 // The last option must always win.
2596 2604 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2597 2605 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2598 2606 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2599 2607 // The last option must always win.
2600 2608 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2601 2609 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2602 2610 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2603 2611 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2604 2612 jio_fprintf(defaultStream::error_stream(),
2605 2613 "Please use CMSClassUnloadingEnabled in place of "
2606 2614 "CMSPermGenSweepingEnabled in the future\n");
2607 2615 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2608 2616 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2609 2617 jio_fprintf(defaultStream::error_stream(),
2610 2618 "Please use -XX:+UseGCOverheadLimit in place of "
2611 2619 "-XX:+UseGCTimeLimit in the future\n");
2612 2620 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2613 2621 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2614 2622 jio_fprintf(defaultStream::error_stream(),
2615 2623 "Please use -XX:-UseGCOverheadLimit in place of "
2616 2624 "-XX:-UseGCTimeLimit in the future\n");
2617 2625 // The TLE options are for compatibility with 1.3 and will be
2618 2626 // removed without notice in a future release. These options
2619 2627 // are not to be documented.
2620 2628 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2621 2629 // No longer used.
2622 2630 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2623 2631 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2624 2632 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2625 2633 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2626 2634 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2627 2635 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2628 2636 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2629 2637 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2630 2638 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2631 2639 // No longer used.
2632 2640 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2633 2641 julong long_tlab_size = 0;
2634 2642 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2635 2643 if (errcode != arg_in_range) {
2636 2644 jio_fprintf(defaultStream::error_stream(),
2637 2645 "Invalid TLAB size: %s\n", option->optionString);
2638 2646 describe_range_error(errcode);
2639 2647 return JNI_EINVAL;
2640 2648 }
2641 2649 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2642 2650 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2643 2651 // No longer used.
2644 2652 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2645 2653 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2646 2654 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2647 2655 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2648 2656 SOLARIS_ONLY(
2649 2657 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2650 2658 warning("-XX:+UsePermISM is obsolete.");
2651 2659 FLAG_SET_CMDLINE(bool, UseISM, true);
2652 2660 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2653 2661 FLAG_SET_CMDLINE(bool, UseISM, false);
2654 2662 )
2655 2663 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2656 2664 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2657 2665 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2658 2666 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2659 2667 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2660 2668 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2661 2669 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2662 2670 #if defined(DTRACE_ENABLED)
2663 2671 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2664 2672 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2665 2673 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2666 2674 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2667 2675 #else // defined(DTRACE_ENABLED)
2668 2676 jio_fprintf(defaultStream::error_stream(),
2669 2677 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2670 2678 return JNI_EINVAL;
2671 2679 #endif // defined(DTRACE_ENABLED)
2672 2680 #ifdef ASSERT
2673 2681 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2674 2682 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2675 2683 // disable scavenge before parallel mark-compact
2676 2684 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2677 2685 #endif
2678 2686 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2679 2687 julong cms_blocks_to_claim = (julong)atol(tail);
2680 2688 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2681 2689 jio_fprintf(defaultStream::error_stream(),
2682 2690 "Please use -XX:OldPLABSize in place of "
2683 2691 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2684 2692 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2685 2693 julong cms_blocks_to_claim = (julong)atol(tail);
2686 2694 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2687 2695 jio_fprintf(defaultStream::error_stream(),
2688 2696 "Please use -XX:OldPLABSize in place of "
2689 2697 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2690 2698 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2691 2699 julong old_plab_size = 0;
2692 2700 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2693 2701 if (errcode != arg_in_range) {
2694 2702 jio_fprintf(defaultStream::error_stream(),
2695 2703 "Invalid old PLAB size: %s\n", option->optionString);
2696 2704 describe_range_error(errcode);
2697 2705 return JNI_EINVAL;
2698 2706 }
2699 2707 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2700 2708 jio_fprintf(defaultStream::error_stream(),
2701 2709 "Please use -XX:OldPLABSize in place of "
2702 2710 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2703 2711 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2704 2712 julong young_plab_size = 0;
2705 2713 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2706 2714 if (errcode != arg_in_range) {
2707 2715 jio_fprintf(defaultStream::error_stream(),
2708 2716 "Invalid young PLAB size: %s\n", option->optionString);
2709 2717 describe_range_error(errcode);
2710 2718 return JNI_EINVAL;
2711 2719 }
2712 2720 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2713 2721 jio_fprintf(defaultStream::error_stream(),
2714 2722 "Please use -XX:YoungPLABSize in place of "
2715 2723 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2716 2724 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2717 2725 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2718 2726 julong stack_size = 0;
2719 2727 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2720 2728 if (errcode != arg_in_range) {
2721 2729 jio_fprintf(defaultStream::error_stream(),
2722 2730 "Invalid mark stack size: %s\n", option->optionString);
2723 2731 describe_range_error(errcode);
2724 2732 return JNI_EINVAL;
2725 2733 }
2726 2734 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2727 2735 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2728 2736 julong max_stack_size = 0;
2729 2737 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2730 2738 if (errcode != arg_in_range) {
2731 2739 jio_fprintf(defaultStream::error_stream(),
2732 2740 "Invalid maximum mark stack size: %s\n",
2733 2741 option->optionString);
2734 2742 describe_range_error(errcode);
2735 2743 return JNI_EINVAL;
2736 2744 }
2737 2745 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2738 2746 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2739 2747 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2740 2748 uintx conc_threads = 0;
2741 2749 if (!parse_uintx(tail, &conc_threads, 1)) {
2742 2750 jio_fprintf(defaultStream::error_stream(),
2743 2751 "Invalid concurrent threads: %s\n", option->optionString);
2744 2752 return JNI_EINVAL;
2745 2753 }
2746 2754 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2747 2755 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
2748 2756 julong max_direct_memory_size = 0;
2749 2757 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
2750 2758 if (errcode != arg_in_range) {
2751 2759 jio_fprintf(defaultStream::error_stream(),
2752 2760 "Invalid maximum direct memory size: %s\n",
2753 2761 option->optionString);
2754 2762 describe_range_error(errcode);
2755 2763 return JNI_EINVAL;
2756 2764 }
2757 2765 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
2758 2766 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2759 2767 // Skip -XX:Flags= since that case has already been handled
2760 2768 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2761 2769 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2762 2770 return JNI_EINVAL;
2763 2771 }
2764 2772 }
2765 2773 // Unknown option
2766 2774 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2767 2775 return JNI_ERR;
2768 2776 }
2769 2777 }
2770 2778
2771 2779 // Change the default value for flags which have different default values
2772 2780 // when working with older JDKs.
2773 2781 if (JDK_Version::current().compare_major(6) <= 0 &&
2774 2782 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2775 2783 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2776 2784 }
2777 2785 #ifdef LINUX
2778 2786 if (JDK_Version::current().compare_major(6) <= 0 &&
2779 2787 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2780 2788 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2781 2789 }
2782 2790 #endif // LINUX
2783 2791 return JNI_OK;
2784 2792 }
2785 2793
2786 2794 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2787 2795 // This must be done after all -D arguments have been processed.
2788 2796 scp_p->expand_endorsed();
2789 2797
2790 2798 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2791 2799 // Assemble the bootclasspath elements into the final path.
2792 2800 Arguments::set_sysclasspath(scp_p->combined_path());
2793 2801 }
2794 2802
2795 2803 // This must be done after all arguments have been processed.
2796 2804 // java_compiler() true means set to "NONE" or empty.
2797 2805 if (java_compiler() && !xdebug_mode()) {
2798 2806 // For backwards compatibility, we switch to interpreted mode if
2799 2807 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2800 2808 // not specified.
2801 2809 set_mode_flags(_int);
2802 2810 }
2803 2811 if (CompileThreshold == 0) {
2804 2812 set_mode_flags(_int);
2805 2813 }
2806 2814
2807 2815 #ifndef COMPILER2
2808 2816 // Don't degrade server performance for footprint
2809 2817 if (FLAG_IS_DEFAULT(UseLargePages) &&
2810 2818 MaxHeapSize < LargePageHeapSizeThreshold) {
2811 2819 // No need for large granularity pages w/small heaps.
2812 2820 // Note that large pages are enabled/disabled for both the
2813 2821 // Java heap and the code cache.
2814 2822 FLAG_SET_DEFAULT(UseLargePages, false);
2815 2823 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2816 2824 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2817 2825 }
2818 2826
2819 2827 // Tiered compilation is undefined with C1.
2820 2828 TieredCompilation = false;
2821 2829 #else
2822 2830 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2823 2831 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2824 2832 }
2825 2833 #endif
2826 2834
2827 2835 // If we are running in a headless jre, force java.awt.headless property
2828 2836 // to be true unless the property has already been set.
2829 2837 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2830 2838 if (os::is_headless_jre()) {
2831 2839 const char* headless = Arguments::get_property("java.awt.headless");
2832 2840 if (headless == NULL) {
2833 2841 char envbuffer[128];
2834 2842 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2835 2843 if (!add_property("java.awt.headless=true")) {
2836 2844 return JNI_ENOMEM;
2837 2845 }
2838 2846 } else {
2839 2847 char buffer[256];
2840 2848 strcpy(buffer, "java.awt.headless=");
2841 2849 strcat(buffer, envbuffer);
2842 2850 if (!add_property(buffer)) {
2843 2851 return JNI_ENOMEM;
2844 2852 }
2845 2853 }
2846 2854 }
2847 2855 }
2848 2856
2849 2857 if (!check_vm_args_consistency()) {
2850 2858 return JNI_ERR;
2851 2859 }
2852 2860
2853 2861 return JNI_OK;
2854 2862 }
2855 2863
2856 2864 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2857 2865 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2858 2866 scp_assembly_required_p);
2859 2867 }
2860 2868
2861 2869 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2862 2870 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2863 2871 scp_assembly_required_p);
2864 2872 }
2865 2873
2866 2874 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2867 2875 const int N_MAX_OPTIONS = 64;
2868 2876 const int OPTION_BUFFER_SIZE = 1024;
2869 2877 char buffer[OPTION_BUFFER_SIZE];
2870 2878
2871 2879 // The variable will be ignored if it exceeds the length of the buffer.
2872 2880 // Don't check this variable if user has special privileges
2873 2881 // (e.g. unix su command).
2874 2882 if (os::getenv(name, buffer, sizeof(buffer)) &&
2875 2883 !os::have_special_privileges()) {
2876 2884 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2877 2885 jio_fprintf(defaultStream::error_stream(),
2878 2886 "Picked up %s: %s\n", name, buffer);
2879 2887 char* rd = buffer; // pointer to the input string (rd)
2880 2888 int i;
2881 2889 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2882 2890 while (isspace(*rd)) rd++; // skip whitespace
2883 2891 if (*rd == 0) break; // we re done when the input string is read completely
2884 2892
2885 2893 // The output, option string, overwrites the input string.
2886 2894 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2887 2895 // input string (rd).
2888 2896 char* wrt = rd;
2889 2897
2890 2898 options[i++].optionString = wrt; // Fill in option
2891 2899 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2892 2900 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2893 2901 int quote = *rd; // matching quote to look for
2894 2902 rd++; // don't copy open quote
2895 2903 while (*rd != quote) { // include everything (even spaces) up until quote
2896 2904 if (*rd == 0) { // string termination means unmatched string
2897 2905 jio_fprintf(defaultStream::error_stream(),
2898 2906 "Unmatched quote in %s\n", name);
2899 2907 return JNI_ERR;
2900 2908 }
2901 2909 *wrt++ = *rd++; // copy to option string
2902 2910 }
2903 2911 rd++; // don't copy close quote
2904 2912 } else {
2905 2913 *wrt++ = *rd++; // copy to option string
2906 2914 }
2907 2915 }
2908 2916 // Need to check if we're done before writing a NULL,
2909 2917 // because the write could be to the byte that rd is pointing to.
2910 2918 if (*rd++ == 0) {
2911 2919 *wrt = 0;
2912 2920 break;
2913 2921 }
2914 2922 *wrt = 0; // Zero terminate option
2915 2923 }
2916 2924 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2917 2925 JavaVMInitArgs vm_args;
2918 2926 vm_args.version = JNI_VERSION_1_2;
2919 2927 vm_args.options = options;
2920 2928 vm_args.nOptions = i;
2921 2929 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2922 2930
2923 2931 if (PrintVMOptions) {
2924 2932 const char* tail;
2925 2933 for (int i = 0; i < vm_args.nOptions; i++) {
2926 2934 const JavaVMOption *option = vm_args.options + i;
2927 2935 if (match_option(option, "-XX:", &tail)) {
2928 2936 logOption(tail);
2929 2937 }
2930 2938 }
2931 2939 }
2932 2940
2933 2941 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2934 2942 }
2935 2943 return JNI_OK;
2936 2944 }
2937 2945
2938 2946 void Arguments::set_shared_spaces_flags() {
2939 2947 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
2940 2948 const bool might_share = must_share || UseSharedSpaces;
2941 2949
2942 2950 // CompressedOops cannot be used with CDS. The offsets of oopmaps and
2943 2951 // static fields are incorrect in the archive. With some more clever
2944 2952 // initialization, this restriction can probably be lifted.
2945 2953 // ??? UseLargePages might be okay now
2946 2954 const bool cannot_share = UseCompressedOops ||
2947 2955 (UseLargePages && FLAG_IS_CMDLINE(UseLargePages));
2948 2956 if (cannot_share) {
2949 2957 if (must_share) {
2950 2958 warning("disabling large pages %s"
2951 2959 "because of %s", "" LP64_ONLY("and compressed oops "),
2952 2960 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
2953 2961 FLAG_SET_CMDLINE(bool, UseLargePages, false);
2954 2962 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
2955 2963 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false));
2956 2964 } else {
2957 2965 // Prefer compressed oops and large pages to class data sharing
2958 2966 if (UseSharedSpaces && Verbose) {
2959 2967 warning("turning off use of shared archive because of large pages%s",
2960 2968 "" LP64_ONLY(" and/or compressed oops"));
2961 2969 }
2962 2970 no_shared_spaces();
2963 2971 }
2964 2972 } else if (UseLargePages && might_share) {
2965 2973 // Disable large pages to allow shared spaces. This is sub-optimal, since
2966 2974 // there may not even be a shared archive to use.
2967 2975 FLAG_SET_DEFAULT(UseLargePages, false);
2968 2976 }
2969 2977
2970 2978 // Add 2M to any size for SharedReadOnlySize to get around the JPRT setting
2971 2979 if (DumpSharedSpaces && !FLAG_IS_DEFAULT(SharedReadOnlySize)) {
2972 2980 SharedReadOnlySize = 14*M;
2973 2981 }
2974 2982
2975 2983 if (DumpSharedSpaces) {
2976 2984 if (RequireSharedSpaces) {
2977 2985 warning("cannot dump shared archive while using shared archive");
2978 2986 }
2979 2987 UseSharedSpaces = false;
2980 2988 }
2981 2989 }
2982 2990
2983 2991 // Disable options not supported in this release, with a warning if they
2984 2992 // were explicitly requested on the command-line
2985 2993 #define UNSUPPORTED_OPTION(opt, description) \
2986 2994 do { \
2987 2995 if (opt) { \
2988 2996 if (FLAG_IS_CMDLINE(opt)) { \
2989 2997 warning(description " is disabled in this release."); \
2990 2998 } \
2991 2999 FLAG_SET_DEFAULT(opt, false); \
2992 3000 } \
2993 3001 } while(0)
2994 3002
2995 3003 // Parse entry point called from JNI_CreateJavaVM
2996 3004
2997 3005 jint Arguments::parse(const JavaVMInitArgs* args) {
2998 3006
2999 3007 // Sharing support
3000 3008 // Construct the path to the archive
3001 3009 char jvm_path[JVM_MAXPATHLEN];
3002 3010 os::jvm_path(jvm_path, sizeof(jvm_path));
3003 3011 char *end = strrchr(jvm_path, *os::file_separator());
3004 3012 if (end != NULL) *end = '\0';
3005 3013 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
3006 3014 strlen(os::file_separator()) + 20, mtInternal);
3007 3015 if (shared_archive_path == NULL) return JNI_ENOMEM;
3008 3016 strcpy(shared_archive_path, jvm_path);
3009 3017 strcat(shared_archive_path, os::file_separator());
3010 3018 strcat(shared_archive_path, "classes");
3011 3019 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
3012 3020 strcat(shared_archive_path, ".jsa");
3013 3021 SharedArchivePath = shared_archive_path;
3014 3022
3015 3023 // Remaining part of option string
3016 3024 const char* tail;
3017 3025
3018 3026 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3019 3027 const char* hotspotrc = ".hotspotrc";
3020 3028 bool settings_file_specified = false;
3021 3029 bool needs_hotspotrc_warning = false;
3022 3030
3023 3031 const char* flags_file;
3024 3032 int index;
3025 3033 for (index = 0; index < args->nOptions; index++) {
3026 3034 const JavaVMOption *option = args->options + index;
3027 3035 if (match_option(option, "-XX:Flags=", &tail)) {
3028 3036 flags_file = tail;
3029 3037 settings_file_specified = true;
3030 3038 }
3031 3039 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3032 3040 PrintVMOptions = true;
3033 3041 }
3034 3042 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3035 3043 PrintVMOptions = false;
3036 3044 }
3037 3045 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3038 3046 IgnoreUnrecognizedVMOptions = true;
3039 3047 }
3040 3048 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3041 3049 IgnoreUnrecognizedVMOptions = false;
3042 3050 }
3043 3051 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3044 3052 CommandLineFlags::printFlags(tty, false);
3045 3053 vm_exit(0);
3046 3054 }
3047 3055 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3048 3056 MemTracker::init_tracking_options(tail);
3049 3057 }
3050 3058
3051 3059
3052 3060 #ifndef PRODUCT
3053 3061 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3054 3062 CommandLineFlags::printFlags(tty, true);
3055 3063 vm_exit(0);
3056 3064 }
3057 3065 #endif
3058 3066 }
3059 3067
3060 3068 if (IgnoreUnrecognizedVMOptions) {
3061 3069 // uncast const to modify the flag args->ignoreUnrecognized
3062 3070 *(jboolean*)(&args->ignoreUnrecognized) = true;
3063 3071 }
3064 3072
3065 3073 // Parse specified settings file
3066 3074 if (settings_file_specified) {
3067 3075 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3068 3076 return JNI_EINVAL;
3069 3077 }
3070 3078 } else {
3071 3079 #ifdef ASSERT
3072 3080 // Parse default .hotspotrc settings file
3073 3081 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3074 3082 return JNI_EINVAL;
3075 3083 }
3076 3084 #else
3077 3085 struct stat buf;
3078 3086 if (os::stat(hotspotrc, &buf) == 0) {
3079 3087 needs_hotspotrc_warning = true;
3080 3088 }
3081 3089 #endif
3082 3090 }
3083 3091
3084 3092 if (PrintVMOptions) {
3085 3093 for (index = 0; index < args->nOptions; index++) {
3086 3094 const JavaVMOption *option = args->options + index;
3087 3095 if (match_option(option, "-XX:", &tail)) {
3088 3096 logOption(tail);
3089 3097 }
3090 3098 }
3091 3099 }
3092 3100
3093 3101 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3094 3102 jint result = parse_vm_init_args(args);
3095 3103 if (result != JNI_OK) {
3096 3104 return result;
3097 3105 }
3098 3106
3099 3107 // Delay warning until here so that we've had a chance to process
3100 3108 // the -XX:-PrintWarnings flag
3101 3109 if (needs_hotspotrc_warning) {
3102 3110 warning("%s file is present but has been ignored. "
3103 3111 "Run with -XX:Flags=%s to load the file.",
3104 3112 hotspotrc, hotspotrc);
3105 3113 }
3106 3114
3107 3115 #if (defined JAVASE_EMBEDDED || defined ARM)
3108 3116 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3109 3117 #endif
3110 3118
3111 3119 #ifndef PRODUCT
3112 3120 if (TraceBytecodesAt != 0) {
3113 3121 TraceBytecodes = true;
3114 3122 }
3115 3123 if (CountCompiledCalls) {
3116 3124 if (UseCounterDecay) {
3117 3125 warning("UseCounterDecay disabled because CountCalls is set");
3118 3126 UseCounterDecay = false;
3119 3127 }
3120 3128 }
3121 3129 #endif // PRODUCT
3122 3130
3123 3131 // JSR 292 is not supported before 1.7
3124 3132 if (!JDK_Version::is_gte_jdk17x_version()) {
3125 3133 if (EnableInvokeDynamic) {
3126 3134 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3127 3135 warning("JSR 292 is not supported before 1.7. Disabling support.");
3128 3136 }
3129 3137 EnableInvokeDynamic = false;
3130 3138 }
3131 3139 }
3132 3140
3133 3141 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3134 3142 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3135 3143 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3136 3144 }
3137 3145 ScavengeRootsInCode = 1;
3138 3146 }
3139 3147
3140 3148 if (PrintGCDetails) {
3141 3149 // Turn on -verbose:gc options as well
3142 3150 PrintGC = true;
3143 3151 }
3144 3152
3145 3153 if (!JDK_Version::is_gte_jdk18x_version()) {
3146 3154 // To avoid changing the log format for 7 updates this flag is only
3147 3155 // true by default in JDK8 and above.
3148 3156 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3149 3157 FLAG_SET_DEFAULT(PrintGCCause, false);
3150 3158 }
3151 3159 }
3152 3160
3153 3161 // Set object alignment values.
3154 3162 set_object_alignment();
3155 3163
3156 3164 #ifdef SERIALGC
3157 3165 force_serial_gc();
3158 3166 #endif // SERIALGC
3159 3167 #ifdef KERNEL
3160 3168 no_shared_spaces();
3161 3169 #endif // KERNEL
3162 3170
3163 3171 // Set flags based on ergonomics.
3164 3172 set_ergonomics_flags();
3165 3173
3166 3174 set_shared_spaces_flags();
3167 3175
3168 3176 // Check the GC selections again.
3169 3177 if (!check_gc_consistency()) {
3170 3178 return JNI_EINVAL;
3171 3179 }
3172 3180
3173 3181 if (TieredCompilation) {
3174 3182 set_tiered_flags();
3175 3183 } else {
3176 3184 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3177 3185 if (CompilationPolicyChoice >= 2) {
3178 3186 vm_exit_during_initialization(
3179 3187 "Incompatible compilation policy selected", NULL);
3180 3188 }
3181 3189 }
3182 3190
3183 3191 #ifndef KERNEL
3184 3192 // Set heap size based on available physical memory
3185 3193 set_heap_size();
3186 3194 // Set per-collector flags
3187 3195 if (UseParallelGC || UseParallelOldGC) {
3188 3196 set_parallel_gc_flags();
3189 3197 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3190 3198 set_cms_and_parnew_gc_flags();
3191 3199 } else if (UseParNewGC) { // skipped if CMS is set above
3192 3200 set_parnew_gc_flags();
3193 3201 } else if (UseG1GC) {
3194 3202 set_g1_gc_flags();
3195 3203 }
3196 3204 #endif // KERNEL
3197 3205
3198 3206 #ifdef SERIALGC
3199 3207 assert(verify_serial_gc_flags(), "SerialGC unset");
3200 3208 #endif // SERIALGC
3201 3209
3202 3210 // Set bytecode rewriting flags
3203 3211 set_bytecode_flags();
3204 3212
3205 3213 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3206 3214 set_aggressive_opts_flags();
3207 3215
3208 3216 // Turn off biased locking for locking debug mode flags,
3209 3217 // which are subtlely different from each other but neither works with
3210 3218 // biased locking.
3211 3219 if (UseHeavyMonitors
3212 3220 #ifdef COMPILER1
3213 3221 || !UseFastLocking
3214 3222 #endif // COMPILER1
3215 3223 ) {
3216 3224 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3217 3225 // flag set to true on command line; warn the user that they
3218 3226 // can't enable biased locking here
3219 3227 warning("Biased Locking is not supported with locking debug flags"
3220 3228 "; ignoring UseBiasedLocking flag." );
3221 3229 }
3222 3230 UseBiasedLocking = false;
3223 3231 }
3224 3232
3225 3233 #ifdef CC_INTERP
3226 3234 // Clear flags not supported by the C++ interpreter
3227 3235 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3228 3236 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3229 3237 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3230 3238 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false));
3231 3239 #endif // CC_INTERP
3232 3240
3233 3241 #ifdef COMPILER2
3234 3242 if (!UseBiasedLocking || EmitSync != 0) {
3235 3243 UseOptoBiasInlining = false;
3236 3244 }
3237 3245 if (!EliminateLocks) {
3238 3246 EliminateNestedLocks = false;
3239 3247 }
3240 3248 #endif
3241 3249
3242 3250 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3243 3251 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3244 3252 DebugNonSafepoints = true;
3245 3253 }
3246 3254
3247 3255 #ifndef PRODUCT
3248 3256 if (CompileTheWorld) {
3249 3257 // Force NmethodSweeper to sweep whole CodeCache each time.
3250 3258 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3251 3259 NmethodSweepFraction = 1;
3252 3260 }
3253 3261 }
3254 3262 #endif
3255 3263
3256 3264 if (PrintCommandLineFlags) {
3257 3265 CommandLineFlags::printSetFlags(tty);
3258 3266 }
3259 3267
3260 3268 // Apply CPU specific policy for the BiasedLocking
3261 3269 if (UseBiasedLocking) {
3262 3270 if (!VM_Version::use_biased_locking() &&
3263 3271 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3264 3272 UseBiasedLocking = false;
3265 3273 }
3266 3274 }
3267 3275
3268 3276 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3269 3277 // but only if not already set on the commandline
3270 3278 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3271 3279 bool set = false;
3272 3280 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3273 3281 if (!set) {
3274 3282 FLAG_SET_DEFAULT(PauseAtExit, true);
3275 3283 }
3276 3284 }
3277 3285
3278 3286 return JNI_OK;
3279 3287 }
3280 3288
3281 3289 int Arguments::PropertyList_count(SystemProperty* pl) {
3282 3290 int count = 0;
3283 3291 while(pl != NULL) {
3284 3292 count++;
3285 3293 pl = pl->next();
3286 3294 }
3287 3295 return count;
3288 3296 }
3289 3297
3290 3298 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3291 3299 assert(key != NULL, "just checking");
3292 3300 SystemProperty* prop;
3293 3301 for (prop = pl; prop != NULL; prop = prop->next()) {
3294 3302 if (strcmp(key, prop->key()) == 0) return prop->value();
3295 3303 }
3296 3304 return NULL;
3297 3305 }
3298 3306
3299 3307 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3300 3308 int count = 0;
3301 3309 const char* ret_val = NULL;
3302 3310
3303 3311 while(pl != NULL) {
3304 3312 if(count >= index) {
3305 3313 ret_val = pl->key();
3306 3314 break;
3307 3315 }
3308 3316 count++;
3309 3317 pl = pl->next();
3310 3318 }
3311 3319
3312 3320 return ret_val;
3313 3321 }
3314 3322
3315 3323 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3316 3324 int count = 0;
3317 3325 char* ret_val = NULL;
3318 3326
3319 3327 while(pl != NULL) {
3320 3328 if(count >= index) {
3321 3329 ret_val = pl->value();
3322 3330 break;
3323 3331 }
3324 3332 count++;
3325 3333 pl = pl->next();
3326 3334 }
3327 3335
3328 3336 return ret_val;
3329 3337 }
3330 3338
3331 3339 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3332 3340 SystemProperty* p = *plist;
3333 3341 if (p == NULL) {
3334 3342 *plist = new_p;
3335 3343 } else {
3336 3344 while (p->next() != NULL) {
3337 3345 p = p->next();
3338 3346 }
3339 3347 p->set_next(new_p);
3340 3348 }
3341 3349 }
3342 3350
3343 3351 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3344 3352 if (plist == NULL)
3345 3353 return;
3346 3354
3347 3355 SystemProperty* new_p = new SystemProperty(k, v, true);
3348 3356 PropertyList_add(plist, new_p);
3349 3357 }
3350 3358
3351 3359 // This add maintains unique property key in the list.
3352 3360 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3353 3361 if (plist == NULL)
3354 3362 return;
3355 3363
3356 3364 // If property key exist then update with new value.
3357 3365 SystemProperty* prop;
3358 3366 for (prop = *plist; prop != NULL; prop = prop->next()) {
3359 3367 if (strcmp(k, prop->key()) == 0) {
3360 3368 if (append) {
3361 3369 prop->append_value(v);
3362 3370 } else {
3363 3371 prop->set_value(v);
3364 3372 }
3365 3373 return;
3366 3374 }
3367 3375 }
3368 3376
3369 3377 PropertyList_add(plist, k, v);
3370 3378 }
3371 3379
3372 3380 #ifdef KERNEL
3373 3381 char *Arguments::get_kernel_properties() {
3374 3382 // Find properties starting with kernel and append them to string
3375 3383 // We need to find out how long they are first because the URL's that they
3376 3384 // might point to could get long.
3377 3385 int length = 0;
3378 3386 SystemProperty* prop;
3379 3387 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3380 3388 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3381 3389 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3382 3390 }
3383 3391 }
3384 3392 // Add one for null terminator.
3385 3393 char *props = AllocateHeap(length + 1, mtInternal);
3386 3394 if (length != 0) {
3387 3395 int pos = 0;
3388 3396 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3389 3397 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3390 3398 jio_snprintf(&props[pos], length-pos,
3391 3399 "-D%s=%s ", prop->key(), prop->value());
3392 3400 pos = strlen(props);
3393 3401 }
3394 3402 }
3395 3403 }
3396 3404 // null terminate props in case of null
3397 3405 props[length] = '\0';
3398 3406 return props;
3399 3407 }
3400 3408 #endif // KERNEL
3401 3409
3402 3410 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3403 3411 // Returns true if all of the source pointed by src has been copied over to
3404 3412 // the destination buffer pointed by buf. Otherwise, returns false.
3405 3413 // Notes:
3406 3414 // 1. If the length (buflen) of the destination buffer excluding the
3407 3415 // NULL terminator character is not long enough for holding the expanded
3408 3416 // pid characters, it also returns false instead of returning the partially
3409 3417 // expanded one.
3410 3418 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3411 3419 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3412 3420 char* buf, size_t buflen) {
3413 3421 const char* p = src;
3414 3422 char* b = buf;
3415 3423 const char* src_end = &src[srclen];
3416 3424 char* buf_end = &buf[buflen - 1];
3417 3425
3418 3426 while (p < src_end && b < buf_end) {
3419 3427 if (*p == '%') {
3420 3428 switch (*(++p)) {
3421 3429 case '%': // "%%" ==> "%"
3422 3430 *b++ = *p++;
3423 3431 break;
3424 3432 case 'p': { // "%p" ==> current process id
3425 3433 // buf_end points to the character before the last character so
3426 3434 // that we could write '\0' to the end of the buffer.
3427 3435 size_t buf_sz = buf_end - b + 1;
3428 3436 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3429 3437
3430 3438 // if jio_snprintf fails or the buffer is not long enough to hold
3431 3439 // the expanded pid, returns false.
3432 3440 if (ret < 0 || ret >= (int)buf_sz) {
3433 3441 return false;
3434 3442 } else {
3435 3443 b += ret;
3436 3444 assert(*b == '\0', "fail in copy_expand_pid");
3437 3445 if (p == src_end && b == buf_end + 1) {
3438 3446 // reach the end of the buffer.
3439 3447 return true;
3440 3448 }
3441 3449 }
3442 3450 p++;
3443 3451 break;
3444 3452 }
3445 3453 default :
3446 3454 *b++ = '%';
3447 3455 }
3448 3456 } else {
3449 3457 *b++ = *p++;
3450 3458 }
3451 3459 }
3452 3460 *b = '\0';
3453 3461 return (p == src_end); // return false if not all of the source was copied
3454 3462 }
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