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rev 3905 : 8001424: G1: Rename certain G1-specific flags
Summary: Rename G1DefaultMinNewGenPercent, G1DefaultMaxNewGenPercent, and G1OldCSetRegionLiveThresholdPercent to G1NewSizePercent, G1MaxNewSizePercent, and G1MixedGCLiveThresholdPercent respectively. Continue, however, to accept the previous names. If both are specified, the new name takes precedence.
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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 "classfile/symbolTable.hpp"
28 28 #include "compiler/compilerOracle.hpp"
29 29 #include "memory/allocation.inline.hpp"
30 30 #include "memory/cardTableRS.hpp"
31 31 #include "memory/referenceProcessor.hpp"
32 32 #include "memory/universe.inline.hpp"
33 33 #include "oops/oop.inline.hpp"
34 34 #include "prims/jvmtiExport.hpp"
35 35 #include "runtime/arguments.hpp"
36 36 #include "runtime/globals_extension.hpp"
37 37 #include "runtime/java.hpp"
38 38 #include "services/management.hpp"
39 39 #include "services/memTracker.hpp"
40 40 #include "utilities/defaultStream.hpp"
41 41 #include "utilities/taskqueue.hpp"
42 42 #ifdef TARGET_OS_FAMILY_linux
43 43 # include "os_linux.inline.hpp"
44 44 #endif
45 45 #ifdef TARGET_OS_FAMILY_solaris
46 46 # include "os_solaris.inline.hpp"
47 47 #endif
48 48 #ifdef TARGET_OS_FAMILY_windows
49 49 # include "os_windows.inline.hpp"
50 50 #endif
51 51 #ifdef TARGET_OS_FAMILY_bsd
52 52 # include "os_bsd.inline.hpp"
53 53 #endif
54 54 #ifndef SERIALGC
55 55 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
56 56 #endif
57 57
58 58 // Note: This is a special bug reporting site for the JVM
59 59 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
60 60 #define DEFAULT_JAVA_LAUNCHER "generic"
61 61
62 62 char** Arguments::_jvm_flags_array = NULL;
63 63 int Arguments::_num_jvm_flags = 0;
64 64 char** Arguments::_jvm_args_array = NULL;
65 65 int Arguments::_num_jvm_args = 0;
66 66 char* Arguments::_java_command = NULL;
67 67 SystemProperty* Arguments::_system_properties = NULL;
68 68 const char* Arguments::_gc_log_filename = NULL;
69 69 bool Arguments::_has_profile = false;
70 70 bool Arguments::_has_alloc_profile = false;
71 71 uintx Arguments::_min_heap_size = 0;
72 72 Arguments::Mode Arguments::_mode = _mixed;
73 73 bool Arguments::_java_compiler = false;
74 74 bool Arguments::_xdebug_mode = false;
75 75 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
76 76 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
77 77 int Arguments::_sun_java_launcher_pid = -1;
78 78 bool Arguments::_created_by_gamma_launcher = false;
79 79
80 80 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
81 81 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
82 82 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
83 83 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
84 84 bool Arguments::_ClipInlining = ClipInlining;
85 85
86 86 char* Arguments::SharedArchivePath = NULL;
87 87
88 88 AgentLibraryList Arguments::_libraryList;
89 89 AgentLibraryList Arguments::_agentList;
90 90
91 91 abort_hook_t Arguments::_abort_hook = NULL;
92 92 exit_hook_t Arguments::_exit_hook = NULL;
93 93 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
94 94
95 95
96 96 SystemProperty *Arguments::_java_ext_dirs = NULL;
97 97 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
98 98 SystemProperty *Arguments::_sun_boot_library_path = NULL;
99 99 SystemProperty *Arguments::_java_library_path = NULL;
100 100 SystemProperty *Arguments::_java_home = NULL;
101 101 SystemProperty *Arguments::_java_class_path = NULL;
102 102 SystemProperty *Arguments::_sun_boot_class_path = NULL;
103 103
104 104 char* Arguments::_meta_index_path = NULL;
105 105 char* Arguments::_meta_index_dir = NULL;
106 106
107 107 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
108 108
109 109 static bool match_option(const JavaVMOption *option, const char* name,
110 110 const char** tail) {
111 111 int len = (int)strlen(name);
112 112 if (strncmp(option->optionString, name, len) == 0) {
113 113 *tail = option->optionString + len;
114 114 return true;
115 115 } else {
116 116 return false;
117 117 }
118 118 }
119 119
120 120 static void logOption(const char* opt) {
121 121 if (PrintVMOptions) {
122 122 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
123 123 }
124 124 }
125 125
126 126 // Process java launcher properties.
127 127 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
128 128 // See if sun.java.launcher or sun.java.launcher.pid is defined.
129 129 // Must do this before setting up other system properties,
130 130 // as some of them may depend on launcher type.
131 131 for (int index = 0; index < args->nOptions; index++) {
132 132 const JavaVMOption* option = args->options + index;
133 133 const char* tail;
134 134
135 135 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
136 136 process_java_launcher_argument(tail, option->extraInfo);
137 137 continue;
138 138 }
139 139 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
140 140 _sun_java_launcher_pid = atoi(tail);
141 141 continue;
142 142 }
143 143 }
144 144 }
145 145
146 146 // Initialize system properties key and value.
147 147 void Arguments::init_system_properties() {
148 148
149 149 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
150 150 "Java Virtual Machine Specification", false));
151 151 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
152 152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
153 153 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
154 154
155 155 // following are JVMTI agent writeable properties.
156 156 // Properties values are set to NULL and they are
157 157 // os specific they are initialized in os::init_system_properties_values().
158 158 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
159 159 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
160 160 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
161 161 _java_library_path = new SystemProperty("java.library.path", NULL, true);
162 162 _java_home = new SystemProperty("java.home", NULL, true);
163 163 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
164 164
165 165 _java_class_path = new SystemProperty("java.class.path", "", true);
166 166
167 167 // Add to System Property list.
168 168 PropertyList_add(&_system_properties, _java_ext_dirs);
169 169 PropertyList_add(&_system_properties, _java_endorsed_dirs);
170 170 PropertyList_add(&_system_properties, _sun_boot_library_path);
171 171 PropertyList_add(&_system_properties, _java_library_path);
172 172 PropertyList_add(&_system_properties, _java_home);
173 173 PropertyList_add(&_system_properties, _java_class_path);
174 174 PropertyList_add(&_system_properties, _sun_boot_class_path);
175 175
176 176 // Set OS specific system properties values
177 177 os::init_system_properties_values();
178 178 }
179 179
180 180
181 181 // Update/Initialize System properties after JDK version number is known
182 182 void Arguments::init_version_specific_system_properties() {
183 183 enum { bufsz = 16 };
184 184 char buffer[bufsz];
185 185 const char* spec_vendor = "Sun Microsystems Inc.";
186 186 uint32_t spec_version = 0;
187 187
188 188 if (JDK_Version::is_gte_jdk17x_version()) {
189 189 spec_vendor = "Oracle Corporation";
190 190 spec_version = JDK_Version::current().major_version();
191 191 }
192 192 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
193 193
194 194 PropertyList_add(&_system_properties,
195 195 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
196 196 PropertyList_add(&_system_properties,
197 197 new SystemProperty("java.vm.specification.version", buffer, false));
198 198 PropertyList_add(&_system_properties,
199 199 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
200 200 }
201 201
202 202 /**
203 203 * Provide a slightly more user-friendly way of eliminating -XX flags.
204 204 * When a flag is eliminated, it can be added to this list in order to
205 205 * continue accepting this flag on the command-line, while issuing a warning
206 206 * and ignoring the value. Once the JDK version reaches the 'accept_until'
207 207 * limit, we flatly refuse to admit the existence of the flag. This allows
208 208 * a flag to die correctly over JDK releases using HSX.
209 209 */
210 210 typedef struct {
211 211 const char* name;
212 212 JDK_Version obsoleted_in; // when the flag went away
213 213 JDK_Version accept_until; // which version to start denying the existence
214 214 } ObsoleteFlag;
215 215
216 216 static ObsoleteFlag obsolete_jvm_flags[] = {
217 217 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
218 218 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
219 219 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
220 220 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
221 221 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
222 222 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
223 223 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 224 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 225 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 226 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 227 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 228 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
229 229 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
230 230 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
231 231 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
232 232 { "DefaultInitialRAMFraction",
233 233 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
234 234 { "UseDepthFirstScavengeOrder",
235 235 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
236 236 { "HandlePromotionFailure",
237 237 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
238 238 { "MaxLiveObjectEvacuationRatio",
239 239 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
240 240 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
241 241 { "UseParallelOldGCCompacting",
242 242 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
243 243 { "UseParallelDensePrefixUpdate",
244 244 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
245 245 { "UseParallelOldGCDensePrefix",
246 246 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
247 247 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
248 248 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
249 249 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
250 250 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
251 251 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
252 252 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
253 253 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
254 254 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
255 255 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
256 256 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
257 257 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
258 258 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
259 259 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
260 260 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
261 261 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
262 262 #ifdef PRODUCT
263 263 { "DesiredMethodLimit",
264 264 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
265 265 #endif // PRODUCT
266 266 { NULL, JDK_Version(0), JDK_Version(0) }
267 267 };
268 268
269 269 // Returns true if the flag is obsolete and fits into the range specified
270 270 // for being ignored. In the case that the flag is ignored, the 'version'
271 271 // value is filled in with the version number when the flag became
272 272 // obsolete so that that value can be displayed to the user.
273 273 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
274 274 int i = 0;
275 275 assert(version != NULL, "Must provide a version buffer");
276 276 while (obsolete_jvm_flags[i].name != NULL) {
277 277 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
278 278 // <flag>=xxx form
279 279 // [-|+]<flag> form
280 280 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
281 281 ((s[0] == '+' || s[0] == '-') &&
282 282 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
283 283 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
284 284 *version = flag_status.obsoleted_in;
285 285 return true;
286 286 }
287 287 }
288 288 i++;
289 289 }
290 290 return false;
291 291 }
292 292
293 293 // Constructs the system class path (aka boot class path) from the following
294 294 // components, in order:
295 295 //
296 296 // prefix // from -Xbootclasspath/p:...
297 297 // endorsed // the expansion of -Djava.endorsed.dirs=...
298 298 // base // from os::get_system_properties() or -Xbootclasspath=
299 299 // suffix // from -Xbootclasspath/a:...
300 300 //
301 301 // java.endorsed.dirs is a list of directories; any jar or zip files in the
302 302 // directories are added to the sysclasspath just before the base.
303 303 //
304 304 // This could be AllStatic, but it isn't needed after argument processing is
305 305 // complete.
306 306 class SysClassPath: public StackObj {
307 307 public:
308 308 SysClassPath(const char* base);
309 309 ~SysClassPath();
310 310
311 311 inline void set_base(const char* base);
312 312 inline void add_prefix(const char* prefix);
313 313 inline void add_suffix_to_prefix(const char* suffix);
314 314 inline void add_suffix(const char* suffix);
315 315 inline void reset_path(const char* base);
316 316
317 317 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
318 318 // property. Must be called after all command-line arguments have been
319 319 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
320 320 // combined_path().
321 321 void expand_endorsed();
322 322
323 323 inline const char* get_base() const { return _items[_scp_base]; }
324 324 inline const char* get_prefix() const { return _items[_scp_prefix]; }
325 325 inline const char* get_suffix() const { return _items[_scp_suffix]; }
326 326 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
327 327
328 328 // Combine all the components into a single c-heap-allocated string; caller
329 329 // must free the string if/when no longer needed.
330 330 char* combined_path();
331 331
332 332 private:
333 333 // Utility routines.
334 334 static char* add_to_path(const char* path, const char* str, bool prepend);
335 335 static char* add_jars_to_path(char* path, const char* directory);
336 336
337 337 inline void reset_item_at(int index);
338 338
339 339 // Array indices for the items that make up the sysclasspath. All except the
340 340 // base are allocated in the C heap and freed by this class.
341 341 enum {
342 342 _scp_prefix, // from -Xbootclasspath/p:...
343 343 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
344 344 _scp_base, // the default sysclasspath
345 345 _scp_suffix, // from -Xbootclasspath/a:...
346 346 _scp_nitems // the number of items, must be last.
347 347 };
348 348
349 349 const char* _items[_scp_nitems];
350 350 DEBUG_ONLY(bool _expansion_done;)
351 351 };
352 352
353 353 SysClassPath::SysClassPath(const char* base) {
354 354 memset(_items, 0, sizeof(_items));
355 355 _items[_scp_base] = base;
356 356 DEBUG_ONLY(_expansion_done = false;)
357 357 }
358 358
359 359 SysClassPath::~SysClassPath() {
360 360 // Free everything except the base.
361 361 for (int i = 0; i < _scp_nitems; ++i) {
362 362 if (i != _scp_base) reset_item_at(i);
363 363 }
364 364 DEBUG_ONLY(_expansion_done = false;)
365 365 }
366 366
367 367 inline void SysClassPath::set_base(const char* base) {
368 368 _items[_scp_base] = base;
369 369 }
370 370
371 371 inline void SysClassPath::add_prefix(const char* prefix) {
372 372 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
373 373 }
374 374
375 375 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
376 376 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
377 377 }
378 378
379 379 inline void SysClassPath::add_suffix(const char* suffix) {
380 380 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
381 381 }
382 382
383 383 inline void SysClassPath::reset_item_at(int index) {
384 384 assert(index < _scp_nitems && index != _scp_base, "just checking");
385 385 if (_items[index] != NULL) {
386 386 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
387 387 _items[index] = NULL;
388 388 }
389 389 }
390 390
391 391 inline void SysClassPath::reset_path(const char* base) {
392 392 // Clear the prefix and suffix.
393 393 reset_item_at(_scp_prefix);
394 394 reset_item_at(_scp_suffix);
395 395 set_base(base);
396 396 }
397 397
398 398 //------------------------------------------------------------------------------
399 399
400 400 void SysClassPath::expand_endorsed() {
401 401 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
402 402
403 403 const char* path = Arguments::get_property("java.endorsed.dirs");
404 404 if (path == NULL) {
405 405 path = Arguments::get_endorsed_dir();
406 406 assert(path != NULL, "no default for java.endorsed.dirs");
407 407 }
408 408
409 409 char* expanded_path = NULL;
410 410 const char separator = *os::path_separator();
411 411 const char* const end = path + strlen(path);
412 412 while (path < end) {
413 413 const char* tmp_end = strchr(path, separator);
414 414 if (tmp_end == NULL) {
415 415 expanded_path = add_jars_to_path(expanded_path, path);
416 416 path = end;
417 417 } else {
418 418 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
419 419 memcpy(dirpath, path, tmp_end - path);
420 420 dirpath[tmp_end - path] = '\0';
421 421 expanded_path = add_jars_to_path(expanded_path, dirpath);
422 422 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
423 423 path = tmp_end + 1;
424 424 }
425 425 }
426 426 _items[_scp_endorsed] = expanded_path;
427 427 DEBUG_ONLY(_expansion_done = true;)
428 428 }
429 429
430 430 // Combine the bootclasspath elements, some of which may be null, into a single
431 431 // c-heap-allocated string.
432 432 char* SysClassPath::combined_path() {
433 433 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
434 434 assert(_expansion_done, "must call expand_endorsed() first.");
435 435
436 436 size_t lengths[_scp_nitems];
437 437 size_t total_len = 0;
438 438
439 439 const char separator = *os::path_separator();
440 440
441 441 // Get the lengths.
442 442 int i;
443 443 for (i = 0; i < _scp_nitems; ++i) {
444 444 if (_items[i] != NULL) {
445 445 lengths[i] = strlen(_items[i]);
446 446 // Include space for the separator char (or a NULL for the last item).
447 447 total_len += lengths[i] + 1;
448 448 }
449 449 }
450 450 assert(total_len > 0, "empty sysclasspath not allowed");
451 451
452 452 // Copy the _items to a single string.
453 453 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
454 454 char* cp_tmp = cp;
455 455 for (i = 0; i < _scp_nitems; ++i) {
456 456 if (_items[i] != NULL) {
457 457 memcpy(cp_tmp, _items[i], lengths[i]);
458 458 cp_tmp += lengths[i];
459 459 *cp_tmp++ = separator;
460 460 }
461 461 }
462 462 *--cp_tmp = '\0'; // Replace the extra separator.
463 463 return cp;
464 464 }
465 465
466 466 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
467 467 char*
468 468 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
469 469 char *cp;
470 470
471 471 assert(str != NULL, "just checking");
472 472 if (path == NULL) {
473 473 size_t len = strlen(str) + 1;
474 474 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
475 475 memcpy(cp, str, len); // copy the trailing null
476 476 } else {
477 477 const char separator = *os::path_separator();
478 478 size_t old_len = strlen(path);
479 479 size_t str_len = strlen(str);
480 480 size_t len = old_len + str_len + 2;
481 481
482 482 if (prepend) {
483 483 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
484 484 char* cp_tmp = cp;
485 485 memcpy(cp_tmp, str, str_len);
486 486 cp_tmp += str_len;
487 487 *cp_tmp = separator;
488 488 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
489 489 FREE_C_HEAP_ARRAY(char, path, mtInternal);
490 490 } else {
491 491 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
492 492 char* cp_tmp = cp + old_len;
493 493 *cp_tmp = separator;
494 494 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
495 495 }
496 496 }
497 497 return cp;
498 498 }
499 499
500 500 // Scan the directory and append any jar or zip files found to path.
501 501 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
502 502 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
503 503 DIR* dir = os::opendir(directory);
504 504 if (dir == NULL) return path;
505 505
506 506 char dir_sep[2] = { '\0', '\0' };
507 507 size_t directory_len = strlen(directory);
508 508 const char fileSep = *os::file_separator();
509 509 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
510 510
511 511 /* Scan the directory for jars/zips, appending them to path. */
512 512 struct dirent *entry;
513 513 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
514 514 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
515 515 const char* name = entry->d_name;
516 516 const char* ext = name + strlen(name) - 4;
517 517 bool isJarOrZip = ext > name &&
518 518 (os::file_name_strcmp(ext, ".jar") == 0 ||
519 519 os::file_name_strcmp(ext, ".zip") == 0);
520 520 if (isJarOrZip) {
521 521 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
522 522 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
523 523 path = add_to_path(path, jarpath, false);
524 524 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
525 525 }
526 526 }
527 527 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
528 528 os::closedir(dir);
529 529 return path;
530 530 }
531 531
532 532 // Parses a memory size specification string.
533 533 static bool atomull(const char *s, julong* result) {
534 534 julong n = 0;
535 535 int args_read = sscanf(s, os::julong_format_specifier(), &n);
536 536 if (args_read != 1) {
537 537 return false;
538 538 }
539 539 while (*s != '\0' && isdigit(*s)) {
540 540 s++;
541 541 }
542 542 // 4705540: illegal if more characters are found after the first non-digit
543 543 if (strlen(s) > 1) {
544 544 return false;
545 545 }
546 546 switch (*s) {
547 547 case 'T': case 't':
548 548 *result = n * G * K;
549 549 // Check for overflow.
550 550 if (*result/((julong)G * K) != n) return false;
551 551 return true;
552 552 case 'G': case 'g':
553 553 *result = n * G;
554 554 if (*result/G != n) return false;
555 555 return true;
556 556 case 'M': case 'm':
557 557 *result = n * M;
558 558 if (*result/M != n) return false;
559 559 return true;
560 560 case 'K': case 'k':
561 561 *result = n * K;
562 562 if (*result/K != n) return false;
563 563 return true;
564 564 case '\0':
565 565 *result = n;
566 566 return true;
567 567 default:
568 568 return false;
569 569 }
570 570 }
571 571
572 572 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
573 573 if (size < min_size) return arg_too_small;
574 574 // Check that size will fit in a size_t (only relevant on 32-bit)
575 575 if (size > max_uintx) return arg_too_big;
576 576 return arg_in_range;
577 577 }
578 578
579 579 // Describe an argument out of range error
580 580 void Arguments::describe_range_error(ArgsRange errcode) {
581 581 switch(errcode) {
582 582 case arg_too_big:
583 583 jio_fprintf(defaultStream::error_stream(),
584 584 "The specified size exceeds the maximum "
585 585 "representable size.\n");
586 586 break;
587 587 case arg_too_small:
588 588 case arg_unreadable:
589 589 case arg_in_range:
590 590 // do nothing for now
591 591 break;
592 592 default:
593 593 ShouldNotReachHere();
594 594 }
595 595 }
596 596
597 597 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
598 598 return CommandLineFlags::boolAtPut(name, &value, origin);
599 599 }
600 600
601 601 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
602 602 double v;
603 603 if (sscanf(value, "%lf", &v) != 1) {
604 604 return false;
605 605 }
606 606
607 607 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
608 608 return true;
609 609 }
610 610 return false;
611 611 }
612 612
613 613 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
614 614 julong v;
615 615 intx intx_v;
616 616 bool is_neg = false;
617 617 // Check the sign first since atomull() parses only unsigned values.
618 618 if (*value == '-') {
619 619 if (!CommandLineFlags::intxAt(name, &intx_v)) {
620 620 return false;
621 621 }
622 622 value++;
623 623 is_neg = true;
624 624 }
625 625 if (!atomull(value, &v)) {
626 626 return false;
627 627 }
628 628 intx_v = (intx) v;
629 629 if (is_neg) {
630 630 intx_v = -intx_v;
631 631 }
632 632 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
633 633 return true;
634 634 }
635 635 uintx uintx_v = (uintx) v;
636 636 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
637 637 return true;
638 638 }
639 639 uint64_t uint64_t_v = (uint64_t) v;
640 640 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
641 641 return true;
642 642 }
643 643 return false;
644 644 }
645 645
646 646 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
647 647 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
648 648 // Contract: CommandLineFlags always returns a pointer that needs freeing.
649 649 FREE_C_HEAP_ARRAY(char, value, mtInternal);
650 650 return true;
651 651 }
652 652
653 653 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
654 654 const char* old_value = "";
655 655 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
656 656 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
657 657 size_t new_len = strlen(new_value);
658 658 const char* value;
659 659 char* free_this_too = NULL;
660 660 if (old_len == 0) {
661 661 value = new_value;
662 662 } else if (new_len == 0) {
663 663 value = old_value;
664 664 } else {
665 665 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
666 666 // each new setting adds another LINE to the switch:
667 667 sprintf(buf, "%s\n%s", old_value, new_value);
668 668 value = buf;
669 669 free_this_too = buf;
670 670 }
671 671 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
672 672 // CommandLineFlags always returns a pointer that needs freeing.
673 673 FREE_C_HEAP_ARRAY(char, value, mtInternal);
674 674 if (free_this_too != NULL) {
675 675 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
676 676 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
677 677 }
678 678 return true;
679 679 }
680 680
681 681 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
682 682
683 683 // range of acceptable characters spelled out for portability reasons
684 684 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
685 685 #define BUFLEN 255
686 686 char name[BUFLEN+1];
687 687 char dummy;
688 688
689 689 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
690 690 return set_bool_flag(name, false, origin);
691 691 }
692 692 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
693 693 return set_bool_flag(name, true, origin);
694 694 }
695 695
696 696 char punct;
697 697 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
698 698 const char* value = strchr(arg, '=') + 1;
699 699 Flag* flag = Flag::find_flag(name, strlen(name));
700 700 if (flag != NULL && flag->is_ccstr()) {
701 701 if (flag->ccstr_accumulates()) {
702 702 return append_to_string_flag(name, value, origin);
703 703 } else {
704 704 if (value[0] == '\0') {
705 705 value = NULL;
706 706 }
707 707 return set_string_flag(name, value, origin);
708 708 }
709 709 }
710 710 }
711 711
712 712 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
713 713 const char* value = strchr(arg, '=') + 1;
714 714 // -XX:Foo:=xxx will reset the string flag to the given value.
715 715 if (value[0] == '\0') {
716 716 value = NULL;
717 717 }
718 718 return set_string_flag(name, value, origin);
719 719 }
720 720
721 721 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
722 722 #define SIGNED_NUMBER_RANGE "[-0123456789]"
723 723 #define NUMBER_RANGE "[0123456789]"
724 724 char value[BUFLEN + 1];
725 725 char value2[BUFLEN + 1];
726 726 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
727 727 // Looks like a floating-point number -- try again with more lenient format string
728 728 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
729 729 return set_fp_numeric_flag(name, value, origin);
730 730 }
731 731 }
732 732
733 733 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
734 734 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
735 735 return set_numeric_flag(name, value, origin);
736 736 }
737 737
738 738 return false;
739 739 }
740 740
741 741 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
742 742 assert(bldarray != NULL, "illegal argument");
743 743
744 744 if (arg == NULL) {
745 745 return;
746 746 }
747 747
748 748 int index = *count;
749 749
750 750 // expand the array and add arg to the last element
751 751 (*count)++;
752 752 if (*bldarray == NULL) {
753 753 *bldarray = NEW_C_HEAP_ARRAY(char*, *count, mtInternal);
754 754 } else {
755 755 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count, mtInternal);
756 756 }
757 757 (*bldarray)[index] = strdup(arg);
758 758 }
759 759
760 760 void Arguments::build_jvm_args(const char* arg) {
761 761 add_string(&_jvm_args_array, &_num_jvm_args, arg);
762 762 }
763 763
764 764 void Arguments::build_jvm_flags(const char* arg) {
765 765 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
766 766 }
767 767
768 768 // utility function to return a string that concatenates all
769 769 // strings in a given char** array
770 770 const char* Arguments::build_resource_string(char** args, int count) {
771 771 if (args == NULL || count == 0) {
772 772 return NULL;
773 773 }
774 774 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
775 775 for (int i = 1; i < count; i++) {
776 776 length += strlen(args[i]) + 1; // add 1 for a space
777 777 }
778 778 char* s = NEW_RESOURCE_ARRAY(char, length);
779 779 strcpy(s, args[0]);
780 780 for (int j = 1; j < count; j++) {
781 781 strcat(s, " ");
782 782 strcat(s, args[j]);
783 783 }
784 784 return (const char*) s;
785 785 }
786 786
787 787 void Arguments::print_on(outputStream* st) {
788 788 st->print_cr("VM Arguments:");
789 789 if (num_jvm_flags() > 0) {
790 790 st->print("jvm_flags: "); print_jvm_flags_on(st);
791 791 }
792 792 if (num_jvm_args() > 0) {
793 793 st->print("jvm_args: "); print_jvm_args_on(st);
794 794 }
795 795 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
796 796 if (_java_class_path != NULL) {
797 797 char* path = _java_class_path->value();
798 798 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
799 799 }
800 800 st->print_cr("Launcher Type: %s", _sun_java_launcher);
801 801 }
802 802
803 803 void Arguments::print_jvm_flags_on(outputStream* st) {
804 804 if (_num_jvm_flags > 0) {
805 805 for (int i=0; i < _num_jvm_flags; i++) {
806 806 st->print("%s ", _jvm_flags_array[i]);
807 807 }
808 808 st->print_cr("");
809 809 }
810 810 }
811 811
812 812 void Arguments::print_jvm_args_on(outputStream* st) {
813 813 if (_num_jvm_args > 0) {
814 814 for (int i=0; i < _num_jvm_args; i++) {
815 815 st->print("%s ", _jvm_args_array[i]);
816 816 }
817 817 st->print_cr("");
818 818 }
819 819 }
820 820
821 821 bool Arguments::process_argument(const char* arg,
822 822 jboolean ignore_unrecognized, FlagValueOrigin origin) {
823 823
824 824 JDK_Version since = JDK_Version();
825 825
826 826 if (parse_argument(arg, origin) || ignore_unrecognized) {
827 827 return true;
828 828 }
829 829
830 830 const char * const argname = *arg == '+' || *arg == '-' ? arg + 1 : arg;
831 831 if (is_newly_obsolete(arg, &since)) {
832 832 char version[256];
833 833 since.to_string(version, sizeof(version));
834 834 warning("ignoring option %s; support was removed in %s", argname, version);
835 835 return true;
836 836 }
837 837
838 838 // For locked flags, report a custom error message if available.
839 839 // Otherwise, report the standard unrecognized VM option.
840 840
841 841 Flag* locked_flag = Flag::find_flag((char*)argname, strlen(argname), true);
842 842 if (locked_flag != NULL) {
843 843 char locked_message_buf[BUFLEN];
844 844 locked_flag->get_locked_message(locked_message_buf, BUFLEN);
845 845 if (strlen(locked_message_buf) == 0) {
846 846 jio_fprintf(defaultStream::error_stream(),
847 847 "Unrecognized VM option '%s'\n", argname);
848 848 } else {
849 849 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
850 850 }
851 851 } else {
852 852 jio_fprintf(defaultStream::error_stream(),
853 853 "Unrecognized VM option '%s'\n", argname);
854 854 }
855 855
856 856 // allow for commandline "commenting out" options like -XX:#+Verbose
857 857 return arg[0] == '#';
858 858 }
859 859
860 860 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
861 861 FILE* stream = fopen(file_name, "rb");
862 862 if (stream == NULL) {
863 863 if (should_exist) {
864 864 jio_fprintf(defaultStream::error_stream(),
865 865 "Could not open settings file %s\n", file_name);
866 866 return false;
867 867 } else {
868 868 return true;
869 869 }
870 870 }
871 871
872 872 char token[1024];
873 873 int pos = 0;
874 874
875 875 bool in_white_space = true;
876 876 bool in_comment = false;
877 877 bool in_quote = false;
878 878 char quote_c = 0;
879 879 bool result = true;
880 880
881 881 int c = getc(stream);
882 882 while(c != EOF && pos < (int)(sizeof(token)-1)) {
883 883 if (in_white_space) {
884 884 if (in_comment) {
885 885 if (c == '\n') in_comment = false;
886 886 } else {
887 887 if (c == '#') in_comment = true;
888 888 else if (!isspace(c)) {
889 889 in_white_space = false;
890 890 token[pos++] = c;
891 891 }
892 892 }
893 893 } else {
894 894 if (c == '\n' || (!in_quote && isspace(c))) {
895 895 // token ends at newline, or at unquoted whitespace
896 896 // this allows a way to include spaces in string-valued options
897 897 token[pos] = '\0';
898 898 logOption(token);
899 899 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
900 900 build_jvm_flags(token);
901 901 pos = 0;
902 902 in_white_space = true;
903 903 in_quote = false;
904 904 } else if (!in_quote && (c == '\'' || c == '"')) {
905 905 in_quote = true;
906 906 quote_c = c;
907 907 } else if (in_quote && (c == quote_c)) {
908 908 in_quote = false;
909 909 } else {
910 910 token[pos++] = c;
911 911 }
912 912 }
913 913 c = getc(stream);
914 914 }
915 915 if (pos > 0) {
916 916 token[pos] = '\0';
917 917 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
918 918 build_jvm_flags(token);
919 919 }
920 920 fclose(stream);
921 921 return result;
922 922 }
923 923
924 924 //=============================================================================================================
925 925 // Parsing of properties (-D)
926 926
927 927 const char* Arguments::get_property(const char* key) {
928 928 return PropertyList_get_value(system_properties(), key);
929 929 }
930 930
931 931 bool Arguments::add_property(const char* prop) {
932 932 const char* eq = strchr(prop, '=');
933 933 char* key;
934 934 // ns must be static--its address may be stored in a SystemProperty object.
935 935 const static char ns[1] = {0};
936 936 char* value = (char *)ns;
937 937
938 938 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
939 939 key = AllocateHeap(key_len + 1, mtInternal);
940 940 strncpy(key, prop, key_len);
941 941 key[key_len] = '\0';
942 942
943 943 if (eq != NULL) {
944 944 size_t value_len = strlen(prop) - key_len - 1;
945 945 value = AllocateHeap(value_len + 1, mtInternal);
946 946 strncpy(value, &prop[key_len + 1], value_len + 1);
947 947 }
948 948
949 949 if (strcmp(key, "java.compiler") == 0) {
950 950 process_java_compiler_argument(value);
951 951 FreeHeap(key);
952 952 if (eq != NULL) {
953 953 FreeHeap(value);
954 954 }
955 955 return true;
956 956 } else if (strcmp(key, "sun.java.command") == 0) {
957 957 _java_command = value;
958 958
959 959 // Record value in Arguments, but let it get passed to Java.
960 960 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
961 961 // launcher.pid property is private and is processed
962 962 // in process_sun_java_launcher_properties();
963 963 // the sun.java.launcher property is passed on to the java application
964 964 FreeHeap(key);
965 965 if (eq != NULL) {
966 966 FreeHeap(value);
967 967 }
968 968 return true;
969 969 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
970 970 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
971 971 // its value without going through the property list or making a Java call.
972 972 _java_vendor_url_bug = value;
973 973 } else if (strcmp(key, "sun.boot.library.path") == 0) {
974 974 PropertyList_unique_add(&_system_properties, key, value, true);
975 975 return true;
976 976 }
977 977 // Create new property and add at the end of the list
978 978 PropertyList_unique_add(&_system_properties, key, value);
979 979 return true;
980 980 }
981 981
982 982 //===========================================================================================================
983 983 // Setting int/mixed/comp mode flags
984 984
985 985 void Arguments::set_mode_flags(Mode mode) {
986 986 // Set up default values for all flags.
987 987 // If you add a flag to any of the branches below,
988 988 // add a default value for it here.
989 989 set_java_compiler(false);
990 990 _mode = mode;
991 991
992 992 // Ensure Agent_OnLoad has the correct initial values.
993 993 // This may not be the final mode; mode may change later in onload phase.
994 994 PropertyList_unique_add(&_system_properties, "java.vm.info",
995 995 (char*)VM_Version::vm_info_string(), false);
996 996
997 997 UseInterpreter = true;
998 998 UseCompiler = true;
999 999 UseLoopCounter = true;
1000 1000
1001 1001 #ifndef ZERO
1002 1002 // Turn these off for mixed and comp. Leave them on for Zero.
1003 1003 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1004 1004 UseFastAccessorMethods = (mode == _int);
1005 1005 }
1006 1006 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1007 1007 UseFastEmptyMethods = (mode == _int);
1008 1008 }
1009 1009 #endif
1010 1010
1011 1011 // Default values may be platform/compiler dependent -
1012 1012 // use the saved values
1013 1013 ClipInlining = Arguments::_ClipInlining;
1014 1014 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1015 1015 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1016 1016 BackgroundCompilation = Arguments::_BackgroundCompilation;
1017 1017
1018 1018 // Change from defaults based on mode
1019 1019 switch (mode) {
1020 1020 default:
1021 1021 ShouldNotReachHere();
1022 1022 break;
1023 1023 case _int:
1024 1024 UseCompiler = false;
1025 1025 UseLoopCounter = false;
1026 1026 AlwaysCompileLoopMethods = false;
1027 1027 UseOnStackReplacement = false;
1028 1028 break;
1029 1029 case _mixed:
1030 1030 // same as default
1031 1031 break;
1032 1032 case _comp:
1033 1033 UseInterpreter = false;
1034 1034 BackgroundCompilation = false;
1035 1035 ClipInlining = false;
1036 1036 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1037 1037 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1038 1038 // compile a level 4 (C2) and then continue executing it.
1039 1039 if (TieredCompilation) {
1040 1040 Tier3InvokeNotifyFreqLog = 0;
1041 1041 Tier4InvocationThreshold = 0;
1042 1042 }
1043 1043 break;
1044 1044 }
1045 1045 }
1046 1046
1047 1047 // Conflict: required to use shared spaces (-Xshare:on), but
1048 1048 // incompatible command line options were chosen.
1049 1049
1050 1050 static void no_shared_spaces() {
1051 1051 if (RequireSharedSpaces) {
1052 1052 jio_fprintf(defaultStream::error_stream(),
1053 1053 "Class data sharing is inconsistent with other specified options.\n");
1054 1054 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1055 1055 } else {
1056 1056 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1057 1057 }
1058 1058 }
1059 1059
1060 1060 void Arguments::set_tiered_flags() {
1061 1061 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1062 1062 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1063 1063 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1064 1064 }
1065 1065 if (CompilationPolicyChoice < 2) {
1066 1066 vm_exit_during_initialization(
1067 1067 "Incompatible compilation policy selected", NULL);
1068 1068 }
1069 1069 // Increase the code cache size - tiered compiles a lot more.
1070 1070 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1071 1071 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
1072 1072 }
1073 1073 }
1074 1074
1075 1075 #if INCLUDE_ALTERNATE_GCS
1076 1076 static void disable_adaptive_size_policy(const char* collector_name) {
1077 1077 if (UseAdaptiveSizePolicy) {
1078 1078 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1079 1079 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1080 1080 collector_name);
1081 1081 }
1082 1082 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1083 1083 }
1084 1084 }
1085 1085
1086 1086 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
1087 1087 // if it's not explictly set or unset. If the user has chosen
1088 1088 // UseParNewGC and not explicitly set ParallelGCThreads we
1089 1089 // set it, unless this is a single cpu machine.
1090 1090 void Arguments::set_parnew_gc_flags() {
1091 1091 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1092 1092 "control point invariant");
1093 1093 assert(UseParNewGC, "Error");
1094 1094
1095 1095 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1096 1096 disable_adaptive_size_policy("UseParNewGC");
1097 1097
1098 1098 if (ParallelGCThreads == 0) {
1099 1099 FLAG_SET_DEFAULT(ParallelGCThreads,
1100 1100 Abstract_VM_Version::parallel_worker_threads());
1101 1101 if (ParallelGCThreads == 1) {
1102 1102 FLAG_SET_DEFAULT(UseParNewGC, false);
1103 1103 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
1104 1104 }
1105 1105 }
1106 1106 if (UseParNewGC) {
1107 1107 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1108 1108 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1109 1109 // we set them to 1024 and 1024.
1110 1110 // See CR 6362902.
1111 1111 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1112 1112 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1113 1113 }
1114 1114 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1115 1115 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1116 1116 }
1117 1117
1118 1118 // AlwaysTenure flag should make ParNew promote all at first collection.
1119 1119 // See CR 6362902.
1120 1120 if (AlwaysTenure) {
1121 1121 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1122 1122 }
1123 1123 // When using compressed oops, we use local overflow stacks,
1124 1124 // rather than using a global overflow list chained through
1125 1125 // the klass word of the object's pre-image.
1126 1126 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1127 1127 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1128 1128 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1129 1129 }
1130 1130 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1131 1131 }
1132 1132 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1133 1133 }
1134 1134 }
1135 1135
1136 1136 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1137 1137 // sparc/solaris for certain applications, but would gain from
1138 1138 // further optimization and tuning efforts, and would almost
1139 1139 // certainly gain from analysis of platform and environment.
1140 1140 void Arguments::set_cms_and_parnew_gc_flags() {
1141 1141 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1142 1142 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1143 1143
1144 1144 // If we are using CMS, we prefer to UseParNewGC,
1145 1145 // unless explicitly forbidden.
1146 1146 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1147 1147 FLAG_SET_ERGO(bool, UseParNewGC, true);
1148 1148 }
1149 1149
1150 1150 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1151 1151 disable_adaptive_size_policy("UseConcMarkSweepGC");
1152 1152
1153 1153 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1154 1154 // as needed.
1155 1155 if (UseParNewGC) {
1156 1156 set_parnew_gc_flags();
1157 1157 }
1158 1158
1159 1159 // MaxHeapSize is aligned down in collectorPolicy
1160 1160 size_t max_heap = align_size_down(MaxHeapSize,
1161 1161 CardTableRS::ct_max_alignment_constraint());
1162 1162
1163 1163 // Now make adjustments for CMS
1164 1164 intx tenuring_default = (intx)6;
1165 1165 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1166 1166
1167 1167 // Preferred young gen size for "short" pauses:
1168 1168 // upper bound depends on # of threads and NewRatio.
1169 1169 const uintx parallel_gc_threads =
1170 1170 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1171 1171 const size_t preferred_max_new_size_unaligned =
1172 1172 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1173 1173 size_t preferred_max_new_size =
1174 1174 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1175 1175
1176 1176 // Unless explicitly requested otherwise, size young gen
1177 1177 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1178 1178
1179 1179 // If either MaxNewSize or NewRatio is set on the command line,
1180 1180 // assume the user is trying to set the size of the young gen.
1181 1181 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1182 1182
1183 1183 // Set MaxNewSize to our calculated preferred_max_new_size unless
1184 1184 // NewSize was set on the command line and it is larger than
1185 1185 // preferred_max_new_size.
1186 1186 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1187 1187 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1188 1188 } else {
1189 1189 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1190 1190 }
1191 1191 if (PrintGCDetails && Verbose) {
1192 1192 // Too early to use gclog_or_tty
1193 1193 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1194 1194 }
1195 1195
1196 1196 // Code along this path potentially sets NewSize and OldSize
1197 1197
1198 1198 assert(max_heap >= InitialHeapSize, "Error");
1199 1199 assert(max_heap >= NewSize, "Error");
1200 1200
1201 1201 if (PrintGCDetails && Verbose) {
1202 1202 // Too early to use gclog_or_tty
1203 1203 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1204 1204 " initial_heap_size: " SIZE_FORMAT
1205 1205 " max_heap: " SIZE_FORMAT,
1206 1206 min_heap_size(), InitialHeapSize, max_heap);
1207 1207 }
1208 1208 size_t min_new = preferred_max_new_size;
1209 1209 if (FLAG_IS_CMDLINE(NewSize)) {
1210 1210 min_new = NewSize;
1211 1211 }
1212 1212 if (max_heap > min_new && min_heap_size() > min_new) {
1213 1213 // Unless explicitly requested otherwise, make young gen
1214 1214 // at least min_new, and at most preferred_max_new_size.
1215 1215 if (FLAG_IS_DEFAULT(NewSize)) {
1216 1216 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1217 1217 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1218 1218 if (PrintGCDetails && Verbose) {
1219 1219 // Too early to use gclog_or_tty
1220 1220 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1221 1221 }
1222 1222 }
1223 1223 // Unless explicitly requested otherwise, size old gen
1224 1224 // so it's NewRatio x of NewSize.
1225 1225 if (FLAG_IS_DEFAULT(OldSize)) {
1226 1226 if (max_heap > NewSize) {
1227 1227 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1228 1228 if (PrintGCDetails && Verbose) {
1229 1229 // Too early to use gclog_or_tty
1230 1230 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1231 1231 }
1232 1232 }
1233 1233 }
1234 1234 }
1235 1235 }
1236 1236 // Unless explicitly requested otherwise, definitely
1237 1237 // promote all objects surviving "tenuring_default" scavenges.
1238 1238 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1239 1239 FLAG_IS_DEFAULT(SurvivorRatio)) {
1240 1240 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1241 1241 }
1242 1242 // If we decided above (or user explicitly requested)
1243 1243 // `promote all' (via MaxTenuringThreshold := 0),
1244 1244 // prefer minuscule survivor spaces so as not to waste
1245 1245 // space for (non-existent) survivors
1246 1246 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1247 1247 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1248 1248 }
1249 1249 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1250 1250 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1251 1251 // This is done in order to make ParNew+CMS configuration to work
1252 1252 // with YoungPLABSize and OldPLABSize options.
1253 1253 // See CR 6362902.
1254 1254 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1255 1255 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1256 1256 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1257 1257 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1258 1258 // the value (either from the command line or ergonomics) of
1259 1259 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1260 1260 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1261 1261 } else {
1262 1262 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1263 1263 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1264 1264 // we'll let it to take precedence.
1265 1265 jio_fprintf(defaultStream::error_stream(),
1266 1266 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1267 1267 " options are specified for the CMS collector."
1268 1268 " CMSParPromoteBlocksToClaim will take precedence.\n");
1269 1269 }
1270 1270 }
1271 1271 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1272 1272 // OldPLAB sizing manually turned off: Use a larger default setting,
1273 1273 // unless it was manually specified. This is because a too-low value
1274 1274 // will slow down scavenges.
1275 1275 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1276 1276 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1277 1277 }
1278 1278 }
1279 1279 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1280 1280 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1281 1281 // If either of the static initialization defaults have changed, note this
1282 1282 // modification.
1283 1283 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1284 1284 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1285 1285 }
1286 1286 if (PrintGCDetails && Verbose) {
1287 1287 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1288 1288 MarkStackSize / K, MarkStackSizeMax / K);
1289 1289 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1290 1290 }
1291 1291 }
1292 1292 #endif // INCLUDE_ALTERNATE_GCS
1293 1293
1294 1294 void set_object_alignment() {
1295 1295 // Object alignment.
1296 1296 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1297 1297 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1298 1298 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1299 1299 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1300 1300 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1301 1301 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1302 1302
1303 1303 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1304 1304 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1305 1305
1306 1306 // Oop encoding heap max
1307 1307 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1308 1308
1309 1309 #if INCLUDE_ALTERNATE_GCS
1310 1310 // Set CMS global values
1311 1311 CompactibleFreeListSpace::set_cms_values();
1312 1312 #endif // INCLUDE_ALTERNATE_GCS
1313 1313 }
1314 1314
1315 1315 bool verify_object_alignment() {
1316 1316 // Object alignment.
1317 1317 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1318 1318 jio_fprintf(defaultStream::error_stream(),
1319 1319 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1320 1320 (int)ObjectAlignmentInBytes);
1321 1321 return false;
1322 1322 }
1323 1323 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1324 1324 jio_fprintf(defaultStream::error_stream(),
1325 1325 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1326 1326 (int)ObjectAlignmentInBytes, BytesPerLong);
1327 1327 return false;
1328 1328 }
1329 1329 // It does not make sense to have big object alignment
1330 1330 // since a space lost due to alignment will be greater
1331 1331 // then a saved space from compressed oops.
1332 1332 if ((int)ObjectAlignmentInBytes > 256) {
1333 1333 jio_fprintf(defaultStream::error_stream(),
1334 1334 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
1335 1335 (int)ObjectAlignmentInBytes);
1336 1336 return false;
1337 1337 }
1338 1338 // In case page size is very small.
1339 1339 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1340 1340 jio_fprintf(defaultStream::error_stream(),
1341 1341 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
1342 1342 (int)ObjectAlignmentInBytes, os::vm_page_size());
1343 1343 return false;
1344 1344 }
1345 1345 return true;
1346 1346 }
1347 1347
1348 1348 inline uintx max_heap_for_compressed_oops() {
1349 1349 // Avoid sign flip.
1350 1350 if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) {
1351 1351 return 0;
1352 1352 }
1353 1353 LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size());
1354 1354 NOT_LP64(ShouldNotReachHere(); return 0);
1355 1355 }
1356 1356
1357 1357 bool Arguments::should_auto_select_low_pause_collector() {
1358 1358 if (UseAutoGCSelectPolicy &&
1359 1359 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1360 1360 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1361 1361 if (PrintGCDetails) {
1362 1362 // Cannot use gclog_or_tty yet.
1363 1363 tty->print_cr("Automatic selection of the low pause collector"
1364 1364 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1365 1365 }
1366 1366 return true;
1367 1367 }
1368 1368 return false;
1369 1369 }
1370 1370
1371 1371 void Arguments::set_ergonomics_flags() {
1372 1372
1373 1373 if (os::is_server_class_machine()) {
1374 1374 // If no other collector is requested explicitly,
1375 1375 // let the VM select the collector based on
1376 1376 // machine class and automatic selection policy.
1377 1377 if (!UseSerialGC &&
1378 1378 !UseConcMarkSweepGC &&
1379 1379 !UseG1GC &&
1380 1380 !UseParNewGC &&
1381 1381 FLAG_IS_DEFAULT(UseParallelGC)) {
1382 1382 if (should_auto_select_low_pause_collector()) {
1383 1383 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1384 1384 } else {
1385 1385 FLAG_SET_ERGO(bool, UseParallelGC, true);
1386 1386 }
1387 1387 }
1388 1388 // Shared spaces work fine with other GCs but causes bytecode rewriting
1389 1389 // to be disabled, which hurts interpreter performance and decreases
1390 1390 // server performance. On server class machines, keep the default
1391 1391 // off unless it is asked for. Future work: either add bytecode rewriting
1392 1392 // at link time, or rewrite bytecodes in non-shared methods.
1393 1393 if (!DumpSharedSpaces && !RequireSharedSpaces) {
1394 1394 no_shared_spaces();
1395 1395 }
1396 1396 }
1397 1397
1398 1398 #ifndef ZERO
1399 1399 #ifdef _LP64
1400 1400 // Check that UseCompressedOops can be set with the max heap size allocated
1401 1401 // by ergonomics.
1402 1402 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1403 1403 #if !defined(COMPILER1) || defined(TIERED)
1404 1404 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1405 1405 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1406 1406 }
1407 1407 #endif
1408 1408 #ifdef _WIN64
1409 1409 if (UseLargePages && UseCompressedOops) {
1410 1410 // Cannot allocate guard pages for implicit checks in indexed addressing
1411 1411 // mode, when large pages are specified on windows.
1412 1412 // This flag could be switched ON if narrow oop base address is set to 0,
1413 1413 // see code in Universe::initialize_heap().
1414 1414 Universe::set_narrow_oop_use_implicit_null_checks(false);
1415 1415 }
1416 1416 #endif // _WIN64
1417 1417 } else {
1418 1418 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1419 1419 warning("Max heap size too large for Compressed Oops");
1420 1420 FLAG_SET_DEFAULT(UseCompressedOops, false);
1421 1421 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1422 1422 }
1423 1423 }
1424 1424 // UseCompressedOops must be on for UseCompressedKlassPointers to be on.
1425 1425 if (!UseCompressedOops) {
1426 1426 if (UseCompressedKlassPointers) {
1427 1427 warning("UseCompressedKlassPointers requires UseCompressedOops");
1428 1428 }
1429 1429 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1430 1430 } else {
1431 1431 // Turn on UseCompressedKlassPointers too
1432 1432 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) {
1433 1433 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true);
1434 1434 }
1435 1435 // Set the ClassMetaspaceSize to something that will not need to be
1436 1436 // expanded, since it cannot be expanded.
1437 1437 if (UseCompressedKlassPointers && FLAG_IS_DEFAULT(ClassMetaspaceSize)) {
1438 1438 // 100,000 classes seems like a good size, so 100M assumes around 1K
1439 1439 // per klass. The vtable and oopMap is embedded so we don't have a fixed
1440 1440 // size per klass. Eventually, this will be parameterized because it
1441 1441 // would also be useful to determine the optimal size of the
1442 1442 // systemDictionary.
1443 1443 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M);
1444 1444 }
1445 1445 }
1446 1446 // Also checks that certain machines are slower with compressed oops
1447 1447 // in vm_version initialization code.
1448 1448 #endif // _LP64
1449 1449 #endif // !ZERO
1450 1450 }
1451 1451
1452 1452 void Arguments::set_parallel_gc_flags() {
1453 1453 assert(UseParallelGC || UseParallelOldGC, "Error");
1454 1454 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1455 1455 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1456 1456 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1457 1457 }
1458 1458 FLAG_SET_DEFAULT(UseParallelGC, true);
1459 1459
1460 1460 // If no heap maximum was requested explicitly, use some reasonable fraction
1461 1461 // of the physical memory, up to a maximum of 1GB.
1462 1462 if (UseParallelGC) {
1463 1463 FLAG_SET_DEFAULT(ParallelGCThreads,
1464 1464 Abstract_VM_Version::parallel_worker_threads());
1465 1465
1466 1466 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1467 1467 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1468 1468 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1469 1469 // See CR 6362902 for details.
1470 1470 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1471 1471 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1472 1472 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1473 1473 }
1474 1474 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1475 1475 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1476 1476 }
1477 1477 }
1478 1478
1479 1479 if (UseParallelOldGC) {
1480 1480 // Par compact uses lower default values since they are treated as
1481 1481 // minimums. These are different defaults because of the different
1482 1482 // interpretation and are not ergonomically set.
1483 1483 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1484 1484 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1485 1485 }
1486 1486 }
1487 1487 }
1488 1488 }
1489 1489
1490 1490 void Arguments::set_g1_gc_flags() {
1491 1491 assert(UseG1GC, "Error");
1492 1492 #ifdef COMPILER1
1493 1493 FastTLABRefill = false;
1494 1494 #endif
1495 1495 FLAG_SET_DEFAULT(ParallelGCThreads,
1496 1496 Abstract_VM_Version::parallel_worker_threads());
1497 1497 if (ParallelGCThreads == 0) {
1498 1498 FLAG_SET_DEFAULT(ParallelGCThreads,
1499 1499 Abstract_VM_Version::parallel_worker_threads());
1500 1500 }
1501 1501
1502 1502 // MarkStackSize will be set (if it hasn't been set by the user)
1503 1503 // when concurrent marking is initialized.
1504 1504 // Its value will be based upon the number of parallel marking threads.
1505 1505 // But we do set the maximum mark stack size here.
1506 1506 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1507 1507 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1508 1508 }
1509 1509
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1510 1510 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1511 1511 // In G1, we want the default GC overhead goal to be higher than
1512 1512 // say in PS. So we set it here to 10%. Otherwise the heap might
1513 1513 // be expanded more aggressively than we would like it to. In
1514 1514 // fact, even 10% seems to not be high enough in some cases
1515 1515 // (especially small GC stress tests that the main thing they do
1516 1516 // is allocation). We might consider increase it further.
1517 1517 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1518 1518 }
1519 1519
1520 +#ifndef SERIALGC
1521 + // The following flag names have been replaced. Accept the previous
1522 + // name for a short while, but set the new flag to the value set
1523 + // by the user. New flag names take precedence though.
1524 + if (FLAG_IS_DEFAULT(G1NewSizePercent) && G1DefaultMinNewGenPercent > 0) {
1525 + FLAG_SET_CMDLINE(uintx, G1NewSizePercent, G1DefaultMinNewGenPercent);
1526 + }
1527 + if (FLAG_IS_DEFAULT(G1MaxNewSizePercent) && G1DefaultMaxNewGenPercent > 0) {
1528 + FLAG_SET_CMDLINE(uintx, G1MaxNewSizePercent, G1DefaultMaxNewGenPercent);
1529 + }
1530 + if (FLAG_IS_DEFAULT(G1MixedGCLiveThresholdPercent) &&
1531 + G1OldCSetRegionLiveThresholdPercent > 0) {
1532 + FLAG_SET_CMDLINE(uintx, G1MaxNewSizePercent, G1OldCSetRegionLiveThresholdPercent);
1533 + }
1534 +#endif
1535 +
1520 1536 if (PrintGCDetails && Verbose) {
1521 1537 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1522 1538 MarkStackSize / K, MarkStackSizeMax / K);
1523 1539 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1524 1540 }
1525 1541 }
1526 1542
1527 1543 void Arguments::set_heap_size() {
1528 1544 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1529 1545 // Deprecated flag
1530 1546 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1531 1547 }
1532 1548
1533 1549 const julong phys_mem =
1534 1550 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1535 1551 : (julong)MaxRAM;
1536 1552
1537 1553 // If the maximum heap size has not been set with -Xmx,
1538 1554 // then set it as fraction of the size of physical memory,
1539 1555 // respecting the maximum and minimum sizes of the heap.
1540 1556 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1541 1557 julong reasonable_max = phys_mem / MaxRAMFraction;
1542 1558
1543 1559 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1544 1560 // Small physical memory, so use a minimum fraction of it for the heap
1545 1561 reasonable_max = phys_mem / MinRAMFraction;
1546 1562 } else {
1547 1563 // Not-small physical memory, so require a heap at least
1548 1564 // as large as MaxHeapSize
1549 1565 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1550 1566 }
1551 1567 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1552 1568 // Limit the heap size to ErgoHeapSizeLimit
1553 1569 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1554 1570 }
1555 1571 if (UseCompressedOops) {
1556 1572 // Limit the heap size to the maximum possible when using compressed oops
1557 1573 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1558 1574 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1559 1575 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1560 1576 // but it should be not less than default MaxHeapSize.
1561 1577 max_coop_heap -= HeapBaseMinAddress;
1562 1578 }
1563 1579 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1564 1580 }
1565 1581 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1566 1582
1567 1583 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1568 1584 // An initial heap size was specified on the command line,
1569 1585 // so be sure that the maximum size is consistent. Done
1570 1586 // after call to allocatable_physical_memory because that
1571 1587 // method might reduce the allocation size.
1572 1588 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1573 1589 }
1574 1590
1575 1591 if (PrintGCDetails && Verbose) {
1576 1592 // Cannot use gclog_or_tty yet.
1577 1593 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1578 1594 }
1579 1595 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1580 1596 }
1581 1597
1582 1598 // If the initial_heap_size has not been set with InitialHeapSize
1583 1599 // or -Xms, then set it as fraction of the size of physical memory,
1584 1600 // respecting the maximum and minimum sizes of the heap.
1585 1601 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1586 1602 julong reasonable_minimum = (julong)(OldSize + NewSize);
1587 1603
1588 1604 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1589 1605
1590 1606 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1591 1607
1592 1608 julong reasonable_initial = phys_mem / InitialRAMFraction;
1593 1609
1594 1610 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1595 1611 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1596 1612
1597 1613 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1598 1614
1599 1615 if (PrintGCDetails && Verbose) {
1600 1616 // Cannot use gclog_or_tty yet.
1601 1617 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1602 1618 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1603 1619 }
1604 1620 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1605 1621 set_min_heap_size((uintx)reasonable_minimum);
1606 1622 }
1607 1623 }
1608 1624
1609 1625 // This must be called after ergonomics because we want bytecode rewriting
1610 1626 // if the server compiler is used, or if UseSharedSpaces is disabled.
1611 1627 void Arguments::set_bytecode_flags() {
1612 1628 // Better not attempt to store into a read-only space.
1613 1629 if (UseSharedSpaces) {
1614 1630 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1615 1631 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1616 1632 }
1617 1633
1618 1634 if (!RewriteBytecodes) {
1619 1635 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1620 1636 }
1621 1637 }
1622 1638
1623 1639 // Aggressive optimization flags -XX:+AggressiveOpts
1624 1640 void Arguments::set_aggressive_opts_flags() {
1625 1641 #ifdef COMPILER2
1626 1642 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1627 1643 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1628 1644 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1629 1645 }
1630 1646 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1631 1647 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1632 1648 }
1633 1649
1634 1650 // Feed the cache size setting into the JDK
1635 1651 char buffer[1024];
1636 1652 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1637 1653 add_property(buffer);
1638 1654 }
1639 1655 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1640 1656 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1641 1657 }
1642 1658 #endif
1643 1659
1644 1660 if (AggressiveOpts) {
1645 1661 // Sample flag setting code
1646 1662 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1647 1663 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1648 1664 // }
1649 1665 }
1650 1666 }
1651 1667
1652 1668 //===========================================================================================================
1653 1669 // Parsing of java.compiler property
1654 1670
1655 1671 void Arguments::process_java_compiler_argument(char* arg) {
1656 1672 // For backwards compatibility, Djava.compiler=NONE or ""
1657 1673 // causes us to switch to -Xint mode UNLESS -Xdebug
1658 1674 // is also specified.
1659 1675 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1660 1676 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1661 1677 }
1662 1678 }
1663 1679
1664 1680 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1665 1681 _sun_java_launcher = strdup(launcher);
1666 1682 if (strcmp("gamma", _sun_java_launcher) == 0) {
1667 1683 _created_by_gamma_launcher = true;
1668 1684 }
1669 1685 }
1670 1686
1671 1687 bool Arguments::created_by_java_launcher() {
1672 1688 assert(_sun_java_launcher != NULL, "property must have value");
1673 1689 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1674 1690 }
1675 1691
1676 1692 bool Arguments::created_by_gamma_launcher() {
1677 1693 return _created_by_gamma_launcher;
1678 1694 }
1679 1695
1680 1696 //===========================================================================================================
1681 1697 // Parsing of main arguments
1682 1698
1683 1699 bool Arguments::verify_interval(uintx val, uintx min,
1684 1700 uintx max, const char* name) {
1685 1701 // Returns true iff value is in the inclusive interval [min..max]
1686 1702 // false, otherwise.
1687 1703 if (val >= min && val <= max) {
1688 1704 return true;
1689 1705 }
1690 1706 jio_fprintf(defaultStream::error_stream(),
1691 1707 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1692 1708 " and " UINTX_FORMAT "\n",
1693 1709 name, val, min, max);
1694 1710 return false;
1695 1711 }
1696 1712
1697 1713 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1698 1714 // Returns true if given value is at least specified min threshold
1699 1715 // false, otherwise.
1700 1716 if (val >= min ) {
1701 1717 return true;
1702 1718 }
1703 1719 jio_fprintf(defaultStream::error_stream(),
1704 1720 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1705 1721 name, val, min);
1706 1722 return false;
1707 1723 }
1708 1724
1709 1725 bool Arguments::verify_percentage(uintx value, const char* name) {
1710 1726 if (value <= 100) {
1711 1727 return true;
1712 1728 }
1713 1729 jio_fprintf(defaultStream::error_stream(),
1714 1730 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1715 1731 name, value);
1716 1732 return false;
1717 1733 }
1718 1734
1719 1735 static void force_serial_gc() {
1720 1736 FLAG_SET_DEFAULT(UseSerialGC, true);
1721 1737 FLAG_SET_DEFAULT(UseParNewGC, false);
1722 1738 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1723 1739 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1724 1740 FLAG_SET_DEFAULT(UseParallelGC, false);
1725 1741 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1726 1742 FLAG_SET_DEFAULT(UseG1GC, false);
1727 1743 }
1728 1744
1729 1745 static bool verify_serial_gc_flags() {
1730 1746 return (UseSerialGC &&
1731 1747 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1732 1748 UseParallelGC || UseParallelOldGC));
1733 1749 }
1734 1750
1735 1751 // check if do gclog rotation
1736 1752 // +UseGCLogFileRotation is a must,
1737 1753 // no gc log rotation when log file not supplied or
1738 1754 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1739 1755 void check_gclog_consistency() {
1740 1756 if (UseGCLogFileRotation) {
1741 1757 if ((Arguments::gc_log_filename() == NULL) ||
1742 1758 (NumberOfGCLogFiles == 0) ||
1743 1759 (GCLogFileSize == 0)) {
1744 1760 jio_fprintf(defaultStream::output_stream(),
1745 1761 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1746 1762 "where num_of_file > 0 and num_of_size > 0\n"
1747 1763 "GC log rotation is turned off\n");
1748 1764 UseGCLogFileRotation = false;
1749 1765 }
1750 1766 }
1751 1767
1752 1768 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1753 1769 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1754 1770 jio_fprintf(defaultStream::output_stream(),
1755 1771 "GCLogFileSize changed to minimum 8K\n");
1756 1772 }
1757 1773 }
1758 1774
1759 1775 // Check consistency of GC selection
1760 1776 bool Arguments::check_gc_consistency() {
1761 1777 check_gclog_consistency();
1762 1778 bool status = true;
1763 1779 // Ensure that the user has not selected conflicting sets
1764 1780 // of collectors. [Note: this check is merely a user convenience;
1765 1781 // collectors over-ride each other so that only a non-conflicting
1766 1782 // set is selected; however what the user gets is not what they
1767 1783 // may have expected from the combination they asked for. It's
1768 1784 // better to reduce user confusion by not allowing them to
1769 1785 // select conflicting combinations.
1770 1786 uint i = 0;
1771 1787 if (UseSerialGC) i++;
1772 1788 if (UseConcMarkSweepGC || UseParNewGC) i++;
1773 1789 if (UseParallelGC || UseParallelOldGC) i++;
1774 1790 if (UseG1GC) i++;
1775 1791 if (i > 1) {
1776 1792 jio_fprintf(defaultStream::error_stream(),
1777 1793 "Conflicting collector combinations in option list; "
1778 1794 "please refer to the release notes for the combinations "
1779 1795 "allowed\n");
1780 1796 status = false;
1781 1797 }
1782 1798
1783 1799 return status;
1784 1800 }
1785 1801
1786 1802 // Check stack pages settings
1787 1803 bool Arguments::check_stack_pages()
1788 1804 {
1789 1805 bool status = true;
1790 1806 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1791 1807 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1792 1808 // greater stack shadow pages can't generate instruction to bang stack
1793 1809 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1794 1810 return status;
1795 1811 }
1796 1812
1797 1813 // Check the consistency of vm_init_args
1798 1814 bool Arguments::check_vm_args_consistency() {
1799 1815 // Method for adding checks for flag consistency.
1800 1816 // The intent is to warn the user of all possible conflicts,
1801 1817 // before returning an error.
1802 1818 // Note: Needs platform-dependent factoring.
1803 1819 bool status = true;
1804 1820
1805 1821 #if ( (defined(COMPILER2) && defined(SPARC)))
1806 1822 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1807 1823 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1808 1824 // x86. Normally, VM_Version_init must be called from init_globals in
1809 1825 // init.cpp, which is called by the initial java thread *after* arguments
1810 1826 // have been parsed. VM_Version_init gets called twice on sparc.
1811 1827 extern void VM_Version_init();
1812 1828 VM_Version_init();
1813 1829 if (!VM_Version::has_v9()) {
1814 1830 jio_fprintf(defaultStream::error_stream(),
1815 1831 "V8 Machine detected, Server requires V9\n");
1816 1832 status = false;
1817 1833 }
1818 1834 #endif /* COMPILER2 && SPARC */
1819 1835
1820 1836 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1821 1837 // builds so the cost of stack banging can be measured.
1822 1838 #if (defined(PRODUCT) && defined(SOLARIS))
1823 1839 if (!UseBoundThreads && !UseStackBanging) {
1824 1840 jio_fprintf(defaultStream::error_stream(),
1825 1841 "-UseStackBanging conflicts with -UseBoundThreads\n");
1826 1842
1827 1843 status = false;
1828 1844 }
1829 1845 #endif
1830 1846
1831 1847 if (TLABRefillWasteFraction == 0) {
1832 1848 jio_fprintf(defaultStream::error_stream(),
1833 1849 "TLABRefillWasteFraction should be a denominator, "
1834 1850 "not " SIZE_FORMAT "\n",
1835 1851 TLABRefillWasteFraction);
1836 1852 status = false;
1837 1853 }
1838 1854
1839 1855 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1840 1856 "AdaptiveSizePolicyWeight");
1841 1857 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1842 1858 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1843 1859 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1844 1860
1845 1861 // Divide by bucket size to prevent a large size from causing rollover when
1846 1862 // calculating amount of memory needed to be allocated for the String table.
1847 1863 status = status && verify_interval(StringTableSize, defaultStringTableSize,
1848 1864 (max_uintx / StringTable::bucket_size()), "StringTable size");
1849 1865
1850 1866 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1851 1867 jio_fprintf(defaultStream::error_stream(),
1852 1868 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1853 1869 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1854 1870 MinHeapFreeRatio, MaxHeapFreeRatio);
1855 1871 status = false;
1856 1872 }
1857 1873 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1858 1874 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1859 1875
1860 1876 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1861 1877 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1862 1878 }
1863 1879
1864 1880 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1865 1881 // Settings to encourage splitting.
1866 1882 if (!FLAG_IS_CMDLINE(NewRatio)) {
1867 1883 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1868 1884 }
1869 1885 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1870 1886 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1871 1887 }
1872 1888 }
1873 1889
1874 1890 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1875 1891 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1876 1892 if (GCTimeLimit == 100) {
1877 1893 // Turn off gc-overhead-limit-exceeded checks
1878 1894 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1879 1895 }
1880 1896
1881 1897 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1882 1898
1883 1899 status = status && check_gc_consistency();
1884 1900 status = status && check_stack_pages();
1885 1901
1886 1902 if (_has_alloc_profile) {
1887 1903 if (UseParallelGC || UseParallelOldGC) {
1888 1904 jio_fprintf(defaultStream::error_stream(),
1889 1905 "error: invalid argument combination.\n"
1890 1906 "Allocation profiling (-Xaprof) cannot be used together with "
1891 1907 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1892 1908 status = false;
1893 1909 }
1894 1910 if (UseConcMarkSweepGC) {
1895 1911 jio_fprintf(defaultStream::error_stream(),
1896 1912 "error: invalid argument combination.\n"
1897 1913 "Allocation profiling (-Xaprof) cannot be used together with "
1898 1914 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1899 1915 status = false;
1900 1916 }
1901 1917 }
1902 1918
1903 1919 if (CMSIncrementalMode) {
1904 1920 if (!UseConcMarkSweepGC) {
1905 1921 jio_fprintf(defaultStream::error_stream(),
1906 1922 "error: invalid argument combination.\n"
1907 1923 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1908 1924 "selected in order\nto use CMSIncrementalMode.\n");
1909 1925 status = false;
1910 1926 } else {
1911 1927 status = status && verify_percentage(CMSIncrementalDutyCycle,
1912 1928 "CMSIncrementalDutyCycle");
1913 1929 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1914 1930 "CMSIncrementalDutyCycleMin");
1915 1931 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1916 1932 "CMSIncrementalSafetyFactor");
1917 1933 status = status && verify_percentage(CMSIncrementalOffset,
1918 1934 "CMSIncrementalOffset");
1919 1935 status = status && verify_percentage(CMSExpAvgFactor,
1920 1936 "CMSExpAvgFactor");
1921 1937 // If it was not set on the command line, set
1922 1938 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1923 1939 if (CMSInitiatingOccupancyFraction < 0) {
1924 1940 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1925 1941 }
1926 1942 }
1927 1943 }
1928 1944
1929 1945 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1930 1946 // insists that we hold the requisite locks so that the iteration is
1931 1947 // MT-safe. For the verification at start-up and shut-down, we don't
1932 1948 // yet have a good way of acquiring and releasing these locks,
1933 1949 // which are not visible at the CollectedHeap level. We want to
1934 1950 // be able to acquire these locks and then do the iteration rather
1935 1951 // than just disable the lock verification. This will be fixed under
1936 1952 // bug 4788986.
1937 1953 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1938 1954 if (VerifyGCStartAt == 0) {
1939 1955 warning("Heap verification at start-up disabled "
1940 1956 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1941 1957 VerifyGCStartAt = 1; // Disable verification at start-up
1942 1958 }
1943 1959 if (VerifyBeforeExit) {
1944 1960 warning("Heap verification at shutdown disabled "
1945 1961 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1946 1962 VerifyBeforeExit = false; // Disable verification at shutdown
1947 1963 }
1948 1964 }
1949 1965
1950 1966 // Note: only executed in non-PRODUCT mode
1951 1967 if (!UseAsyncConcMarkSweepGC &&
1952 1968 (ExplicitGCInvokesConcurrent ||
1953 1969 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1954 1970 jio_fprintf(defaultStream::error_stream(),
1955 1971 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1956 1972 " with -UseAsyncConcMarkSweepGC");
1957 1973 status = false;
1958 1974 }
1959 1975
1960 1976 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
1961 1977
1962 1978 #ifndef SERIALGC
1963 1979 if (UseG1GC) {
1964 1980 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1965 1981 "InitiatingHeapOccupancyPercent");
1966 1982 status = status && verify_min_value(G1RefProcDrainInterval, 1,
1967 1983 "G1RefProcDrainInterval");
1968 1984 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
1969 1985 "G1ConcMarkStepDurationMillis");
1970 1986 }
1971 1987 #endif
1972 1988
1973 1989 status = status && verify_interval(RefDiscoveryPolicy,
1974 1990 ReferenceProcessor::DiscoveryPolicyMin,
1975 1991 ReferenceProcessor::DiscoveryPolicyMax,
1976 1992 "RefDiscoveryPolicy");
1977 1993
1978 1994 // Limit the lower bound of this flag to 1 as it is used in a division
1979 1995 // expression.
1980 1996 status = status && verify_interval(TLABWasteTargetPercent,
1981 1997 1, 100, "TLABWasteTargetPercent");
1982 1998
1983 1999 status = status && verify_object_alignment();
1984 2000
1985 2001 status = status && verify_min_value(ClassMetaspaceSize, 1*M,
1986 2002 "ClassMetaspaceSize");
1987 2003
1988 2004 status = status && verify_interval(MarkStackSizeMax,
1989 2005 1, (max_jint - 1), "MarkStackSizeMax");
1990 2006
1991 2007 #ifdef SPARC
1992 2008 if (UseConcMarkSweepGC || UseG1GC) {
1993 2009 // Issue a stern warning if the user has explicitly set
1994 2010 // UseMemSetInBOT (it is known to cause issues), but allow
1995 2011 // use for experimentation and debugging.
1996 2012 if (VM_Version::is_sun4v() && UseMemSetInBOT) {
1997 2013 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
1998 2014 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
1999 2015 " on sun4v; please understand that you are using at your own risk!");
2000 2016 }
2001 2017 }
2002 2018 #endif // SPARC
2003 2019
2004 2020 if (PrintNMTStatistics) {
2005 2021 #if INCLUDE_NMT
2006 2022 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2007 2023 #endif // INCLUDE_NMT
2008 2024 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2009 2025 PrintNMTStatistics = false;
2010 2026 #if INCLUDE_NMT
2011 2027 }
2012 2028 #endif
2013 2029 }
2014 2030
2015 2031 return status;
2016 2032 }
2017 2033
2018 2034 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2019 2035 const char* option_type) {
2020 2036 if (ignore) return false;
2021 2037
2022 2038 const char* spacer = " ";
2023 2039 if (option_type == NULL) {
2024 2040 option_type = ++spacer; // Set both to the empty string.
2025 2041 }
2026 2042
2027 2043 if (os::obsolete_option(option)) {
2028 2044 jio_fprintf(defaultStream::error_stream(),
2029 2045 "Obsolete %s%soption: %s\n", option_type, spacer,
2030 2046 option->optionString);
2031 2047 return false;
2032 2048 } else {
2033 2049 jio_fprintf(defaultStream::error_stream(),
2034 2050 "Unrecognized %s%soption: %s\n", option_type, spacer,
2035 2051 option->optionString);
2036 2052 return true;
2037 2053 }
2038 2054 }
2039 2055
2040 2056 static const char* user_assertion_options[] = {
2041 2057 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2042 2058 };
2043 2059
2044 2060 static const char* system_assertion_options[] = {
2045 2061 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2046 2062 };
2047 2063
2048 2064 // Return true if any of the strings in null-terminated array 'names' matches.
2049 2065 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2050 2066 // the option must match exactly.
2051 2067 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2052 2068 bool tail_allowed) {
2053 2069 for (/* empty */; *names != NULL; ++names) {
2054 2070 if (match_option(option, *names, tail)) {
2055 2071 if (**tail == '\0' || tail_allowed && **tail == ':') {
2056 2072 return true;
2057 2073 }
2058 2074 }
2059 2075 }
2060 2076 return false;
2061 2077 }
2062 2078
2063 2079 bool Arguments::parse_uintx(const char* value,
2064 2080 uintx* uintx_arg,
2065 2081 uintx min_size) {
2066 2082
2067 2083 // Check the sign first since atomull() parses only unsigned values.
2068 2084 bool value_is_positive = !(*value == '-');
2069 2085
2070 2086 if (value_is_positive) {
2071 2087 julong n;
2072 2088 bool good_return = atomull(value, &n);
2073 2089 if (good_return) {
2074 2090 bool above_minimum = n >= min_size;
2075 2091 bool value_is_too_large = n > max_uintx;
2076 2092
2077 2093 if (above_minimum && !value_is_too_large) {
2078 2094 *uintx_arg = n;
2079 2095 return true;
2080 2096 }
2081 2097 }
2082 2098 }
2083 2099 return false;
2084 2100 }
2085 2101
2086 2102 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2087 2103 julong* long_arg,
2088 2104 julong min_size) {
2089 2105 if (!atomull(s, long_arg)) return arg_unreadable;
2090 2106 return check_memory_size(*long_arg, min_size);
2091 2107 }
2092 2108
2093 2109 // Parse JavaVMInitArgs structure
2094 2110
2095 2111 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2096 2112 // For components of the system classpath.
2097 2113 SysClassPath scp(Arguments::get_sysclasspath());
2098 2114 bool scp_assembly_required = false;
2099 2115
2100 2116 // Save default settings for some mode flags
2101 2117 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2102 2118 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2103 2119 Arguments::_ClipInlining = ClipInlining;
2104 2120 Arguments::_BackgroundCompilation = BackgroundCompilation;
2105 2121
2106 2122 // Setup flags for mixed which is the default
2107 2123 set_mode_flags(_mixed);
2108 2124
2109 2125 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2110 2126 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2111 2127 if (result != JNI_OK) {
2112 2128 return result;
2113 2129 }
2114 2130
2115 2131 // Parse JavaVMInitArgs structure passed in
2116 2132 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2117 2133 if (result != JNI_OK) {
2118 2134 return result;
2119 2135 }
2120 2136
2121 2137 if (AggressiveOpts) {
2122 2138 // Insert alt-rt.jar between user-specified bootclasspath
2123 2139 // prefix and the default bootclasspath. os::set_boot_path()
2124 2140 // uses meta_index_dir as the default bootclasspath directory.
2125 2141 const char* altclasses_jar = "alt-rt.jar";
2126 2142 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2127 2143 strlen(altclasses_jar);
2128 2144 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal);
2129 2145 strcpy(altclasses_path, get_meta_index_dir());
2130 2146 strcat(altclasses_path, altclasses_jar);
2131 2147 scp.add_suffix_to_prefix(altclasses_path);
2132 2148 scp_assembly_required = true;
2133 2149 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal);
2134 2150 }
2135 2151
2136 2152 if (WhiteBoxAPI) {
2137 2153 // Append wb.jar to bootclasspath if enabled
2138 2154 const char* wb_jar = "wb.jar";
2139 2155 size_t wb_path_len = strlen(get_meta_index_dir()) + 1 +
2140 2156 strlen(wb_jar);
2141 2157 char* wb_path = NEW_C_HEAP_ARRAY(char, wb_path_len, mtInternal);
2142 2158 strcpy(wb_path, get_meta_index_dir());
2143 2159 strcat(wb_path, wb_jar);
2144 2160 scp.add_suffix(wb_path);
2145 2161 scp_assembly_required = true;
2146 2162 FREE_C_HEAP_ARRAY(char, wb_path, mtInternal);
2147 2163 }
2148 2164
2149 2165 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2150 2166 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2151 2167 if (result != JNI_OK) {
2152 2168 return result;
2153 2169 }
2154 2170
2155 2171 // Do final processing now that all arguments have been parsed
2156 2172 result = finalize_vm_init_args(&scp, scp_assembly_required);
2157 2173 if (result != JNI_OK) {
2158 2174 return result;
2159 2175 }
2160 2176
2161 2177 return JNI_OK;
2162 2178 }
2163 2179
2164 2180 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2165 2181 SysClassPath* scp_p,
2166 2182 bool* scp_assembly_required_p,
2167 2183 FlagValueOrigin origin) {
2168 2184 // Remaining part of option string
2169 2185 const char* tail;
2170 2186
2171 2187 // iterate over arguments
2172 2188 for (int index = 0; index < args->nOptions; index++) {
2173 2189 bool is_absolute_path = false; // for -agentpath vs -agentlib
2174 2190
2175 2191 const JavaVMOption* option = args->options + index;
2176 2192
2177 2193 if (!match_option(option, "-Djava.class.path", &tail) &&
2178 2194 !match_option(option, "-Dsun.java.command", &tail) &&
2179 2195 !match_option(option, "-Dsun.java.launcher", &tail)) {
2180 2196
2181 2197 // add all jvm options to the jvm_args string. This string
2182 2198 // is used later to set the java.vm.args PerfData string constant.
2183 2199 // the -Djava.class.path and the -Dsun.java.command options are
2184 2200 // omitted from jvm_args string as each have their own PerfData
2185 2201 // string constant object.
2186 2202 build_jvm_args(option->optionString);
2187 2203 }
2188 2204
2189 2205 // -verbose:[class/gc/jni]
2190 2206 if (match_option(option, "-verbose", &tail)) {
2191 2207 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2192 2208 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2193 2209 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2194 2210 } else if (!strcmp(tail, ":gc")) {
2195 2211 FLAG_SET_CMDLINE(bool, PrintGC, true);
2196 2212 } else if (!strcmp(tail, ":jni")) {
2197 2213 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2198 2214 }
2199 2215 // -da / -ea / -disableassertions / -enableassertions
2200 2216 // These accept an optional class/package name separated by a colon, e.g.,
2201 2217 // -da:java.lang.Thread.
2202 2218 } else if (match_option(option, user_assertion_options, &tail, true)) {
2203 2219 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2204 2220 if (*tail == '\0') {
2205 2221 JavaAssertions::setUserClassDefault(enable);
2206 2222 } else {
2207 2223 assert(*tail == ':', "bogus match by match_option()");
2208 2224 JavaAssertions::addOption(tail + 1, enable);
2209 2225 }
2210 2226 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2211 2227 } else if (match_option(option, system_assertion_options, &tail, false)) {
2212 2228 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2213 2229 JavaAssertions::setSystemClassDefault(enable);
2214 2230 // -bootclasspath:
2215 2231 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2216 2232 scp_p->reset_path(tail);
2217 2233 *scp_assembly_required_p = true;
2218 2234 // -bootclasspath/a:
2219 2235 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2220 2236 scp_p->add_suffix(tail);
2221 2237 *scp_assembly_required_p = true;
2222 2238 // -bootclasspath/p:
2223 2239 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2224 2240 scp_p->add_prefix(tail);
2225 2241 *scp_assembly_required_p = true;
2226 2242 // -Xrun
2227 2243 } else if (match_option(option, "-Xrun", &tail)) {
2228 2244 if (tail != NULL) {
2229 2245 const char* pos = strchr(tail, ':');
2230 2246 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2231 2247 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2232 2248 name[len] = '\0';
2233 2249
2234 2250 char *options = NULL;
2235 2251 if(pos != NULL) {
2236 2252 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2237 2253 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2238 2254 }
2239 2255 #if !INCLUDE_JVMTI
2240 2256 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2241 2257 warning("profiling and debugging agents are not supported in this VM");
2242 2258 } else
2243 2259 #endif // !INCLUDE_JVMTI
2244 2260 add_init_library(name, options);
2245 2261 }
2246 2262 // -agentlib and -agentpath
2247 2263 } else if (match_option(option, "-agentlib:", &tail) ||
2248 2264 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2249 2265 if(tail != NULL) {
2250 2266 const char* pos = strchr(tail, '=');
2251 2267 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2252 2268 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2253 2269 name[len] = '\0';
2254 2270
2255 2271 char *options = NULL;
2256 2272 if(pos != NULL) {
2257 2273 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2258 2274 }
2259 2275 #if !INCLUDE_JVMTI
2260 2276 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2261 2277 warning("profiling and debugging agents are not supported in this VM");
2262 2278 } else
2263 2279 #endif // !INCLUDE_JVMTI
2264 2280 add_init_agent(name, options, is_absolute_path);
2265 2281
2266 2282 }
2267 2283 // -javaagent
2268 2284 } else if (match_option(option, "-javaagent:", &tail)) {
2269 2285 #if !INCLUDE_JVMTI
2270 2286 warning("Instrumentation agents are not supported in this VM");
2271 2287 #else
2272 2288 if(tail != NULL) {
2273 2289 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2274 2290 add_init_agent("instrument", options, false);
2275 2291 }
2276 2292 #endif // !INCLUDE_JVMTI
2277 2293 // -Xnoclassgc
2278 2294 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2279 2295 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2280 2296 // -Xincgc: i-CMS
2281 2297 } else if (match_option(option, "-Xincgc", &tail)) {
2282 2298 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2283 2299 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2284 2300 // -Xnoincgc: no i-CMS
2285 2301 } else if (match_option(option, "-Xnoincgc", &tail)) {
2286 2302 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2287 2303 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2288 2304 // -Xconcgc
2289 2305 } else if (match_option(option, "-Xconcgc", &tail)) {
2290 2306 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2291 2307 // -Xnoconcgc
2292 2308 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2293 2309 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2294 2310 // -Xbatch
2295 2311 } else if (match_option(option, "-Xbatch", &tail)) {
2296 2312 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2297 2313 // -Xmn for compatibility with other JVM vendors
2298 2314 } else if (match_option(option, "-Xmn", &tail)) {
2299 2315 julong long_initial_eden_size = 0;
2300 2316 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2301 2317 if (errcode != arg_in_range) {
2302 2318 jio_fprintf(defaultStream::error_stream(),
2303 2319 "Invalid initial eden size: %s\n", option->optionString);
2304 2320 describe_range_error(errcode);
2305 2321 return JNI_EINVAL;
2306 2322 }
2307 2323 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2308 2324 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2309 2325 // -Xms
2310 2326 } else if (match_option(option, "-Xms", &tail)) {
2311 2327 julong long_initial_heap_size = 0;
2312 2328 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2313 2329 if (errcode != arg_in_range) {
2314 2330 jio_fprintf(defaultStream::error_stream(),
2315 2331 "Invalid initial heap size: %s\n", option->optionString);
2316 2332 describe_range_error(errcode);
2317 2333 return JNI_EINVAL;
2318 2334 }
2319 2335 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2320 2336 // Currently the minimum size and the initial heap sizes are the same.
2321 2337 set_min_heap_size(InitialHeapSize);
2322 2338 // -Xmx
2323 2339 } else if (match_option(option, "-Xmx", &tail)) {
2324 2340 julong long_max_heap_size = 0;
2325 2341 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2326 2342 if (errcode != arg_in_range) {
2327 2343 jio_fprintf(defaultStream::error_stream(),
2328 2344 "Invalid maximum heap size: %s\n", option->optionString);
2329 2345 describe_range_error(errcode);
2330 2346 return JNI_EINVAL;
2331 2347 }
2332 2348 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2333 2349 // Xmaxf
2334 2350 } else if (match_option(option, "-Xmaxf", &tail)) {
2335 2351 int maxf = (int)(atof(tail) * 100);
2336 2352 if (maxf < 0 || maxf > 100) {
2337 2353 jio_fprintf(defaultStream::error_stream(),
2338 2354 "Bad max heap free percentage size: %s\n",
2339 2355 option->optionString);
2340 2356 return JNI_EINVAL;
2341 2357 } else {
2342 2358 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2343 2359 }
2344 2360 // Xminf
2345 2361 } else if (match_option(option, "-Xminf", &tail)) {
2346 2362 int minf = (int)(atof(tail) * 100);
2347 2363 if (minf < 0 || minf > 100) {
2348 2364 jio_fprintf(defaultStream::error_stream(),
2349 2365 "Bad min heap free percentage size: %s\n",
2350 2366 option->optionString);
2351 2367 return JNI_EINVAL;
2352 2368 } else {
2353 2369 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2354 2370 }
2355 2371 // -Xss
2356 2372 } else if (match_option(option, "-Xss", &tail)) {
2357 2373 julong long_ThreadStackSize = 0;
2358 2374 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2359 2375 if (errcode != arg_in_range) {
2360 2376 jio_fprintf(defaultStream::error_stream(),
2361 2377 "Invalid thread stack size: %s\n", option->optionString);
2362 2378 describe_range_error(errcode);
2363 2379 return JNI_EINVAL;
2364 2380 }
2365 2381 // Internally track ThreadStackSize in units of 1024 bytes.
2366 2382 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2367 2383 round_to((int)long_ThreadStackSize, K) / K);
2368 2384 // -Xoss
2369 2385 } else if (match_option(option, "-Xoss", &tail)) {
2370 2386 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2371 2387 // -Xmaxjitcodesize
2372 2388 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2373 2389 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2374 2390 julong long_ReservedCodeCacheSize = 0;
2375 2391 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2376 2392 (size_t)InitialCodeCacheSize);
2377 2393 if (errcode != arg_in_range) {
2378 2394 jio_fprintf(defaultStream::error_stream(),
2379 2395 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2380 2396 option->optionString, InitialCodeCacheSize/K);
2381 2397 describe_range_error(errcode);
2382 2398 return JNI_EINVAL;
2383 2399 }
2384 2400 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2385 2401 // -green
2386 2402 } else if (match_option(option, "-green", &tail)) {
2387 2403 jio_fprintf(defaultStream::error_stream(),
2388 2404 "Green threads support not available\n");
2389 2405 return JNI_EINVAL;
2390 2406 // -native
2391 2407 } else if (match_option(option, "-native", &tail)) {
2392 2408 // HotSpot always uses native threads, ignore silently for compatibility
2393 2409 // -Xsqnopause
2394 2410 } else if (match_option(option, "-Xsqnopause", &tail)) {
2395 2411 // EVM option, ignore silently for compatibility
2396 2412 // -Xrs
2397 2413 } else if (match_option(option, "-Xrs", &tail)) {
2398 2414 // Classic/EVM option, new functionality
2399 2415 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2400 2416 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2401 2417 // change default internal VM signals used - lower case for back compat
2402 2418 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2403 2419 // -Xoptimize
2404 2420 } else if (match_option(option, "-Xoptimize", &tail)) {
2405 2421 // EVM option, ignore silently for compatibility
2406 2422 // -Xprof
2407 2423 } else if (match_option(option, "-Xprof", &tail)) {
2408 2424 #if INCLUDE_FPROF
2409 2425 _has_profile = true;
2410 2426 #else // INCLUDE_FPROF
2411 2427 // do we have to exit?
2412 2428 warning("Flat profiling is not supported in this VM.");
2413 2429 #endif // INCLUDE_FPROF
2414 2430 // -Xaprof
2415 2431 } else if (match_option(option, "-Xaprof", &tail)) {
2416 2432 _has_alloc_profile = true;
2417 2433 // -Xconcurrentio
2418 2434 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2419 2435 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2420 2436 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2421 2437 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2422 2438 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2423 2439 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2424 2440
2425 2441 // -Xinternalversion
2426 2442 } else if (match_option(option, "-Xinternalversion", &tail)) {
2427 2443 jio_fprintf(defaultStream::output_stream(), "%s\n",
2428 2444 VM_Version::internal_vm_info_string());
2429 2445 vm_exit(0);
2430 2446 #ifndef PRODUCT
2431 2447 // -Xprintflags
2432 2448 } else if (match_option(option, "-Xprintflags", &tail)) {
2433 2449 CommandLineFlags::printFlags(tty, false);
2434 2450 vm_exit(0);
2435 2451 #endif
2436 2452 // -D
2437 2453 } else if (match_option(option, "-D", &tail)) {
2438 2454 if (!add_property(tail)) {
2439 2455 return JNI_ENOMEM;
2440 2456 }
2441 2457 // Out of the box management support
2442 2458 if (match_option(option, "-Dcom.sun.management", &tail)) {
2443 2459 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2444 2460 }
2445 2461 // -Xint
2446 2462 } else if (match_option(option, "-Xint", &tail)) {
2447 2463 set_mode_flags(_int);
2448 2464 // -Xmixed
2449 2465 } else if (match_option(option, "-Xmixed", &tail)) {
2450 2466 set_mode_flags(_mixed);
2451 2467 // -Xcomp
2452 2468 } else if (match_option(option, "-Xcomp", &tail)) {
2453 2469 // for testing the compiler; turn off all flags that inhibit compilation
2454 2470 set_mode_flags(_comp);
2455 2471
2456 2472 // -Xshare:dump
2457 2473 } else if (match_option(option, "-Xshare:dump", &tail)) {
2458 2474 #if defined(KERNEL)
2459 2475 vm_exit_during_initialization(
2460 2476 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2461 2477 #elif !INCLUDE_CDS
2462 2478 vm_exit_during_initialization(
2463 2479 "Dumping a shared archive is not supported in this VM.", NULL);
2464 2480 #else
2465 2481 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2466 2482 set_mode_flags(_int); // Prevent compilation, which creates objects
2467 2483 #endif
2468 2484 // -Xshare:on
2469 2485 } else if (match_option(option, "-Xshare:on", &tail)) {
2470 2486 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2471 2487 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2472 2488 // -Xshare:auto
2473 2489 } else if (match_option(option, "-Xshare:auto", &tail)) {
2474 2490 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2475 2491 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2476 2492 // -Xshare:off
2477 2493 } else if (match_option(option, "-Xshare:off", &tail)) {
2478 2494 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2479 2495 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2480 2496
2481 2497 // -Xverify
2482 2498 } else if (match_option(option, "-Xverify", &tail)) {
2483 2499 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2484 2500 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2485 2501 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2486 2502 } else if (strcmp(tail, ":remote") == 0) {
2487 2503 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2488 2504 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2489 2505 } else if (strcmp(tail, ":none") == 0) {
2490 2506 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2491 2507 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2492 2508 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2493 2509 return JNI_EINVAL;
2494 2510 }
2495 2511 // -Xdebug
2496 2512 } else if (match_option(option, "-Xdebug", &tail)) {
2497 2513 // note this flag has been used, then ignore
2498 2514 set_xdebug_mode(true);
2499 2515 // -Xnoagent
2500 2516 } else if (match_option(option, "-Xnoagent", &tail)) {
2501 2517 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2502 2518 } else if (match_option(option, "-Xboundthreads", &tail)) {
2503 2519 // Bind user level threads to kernel threads (Solaris only)
2504 2520 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2505 2521 } else if (match_option(option, "-Xloggc:", &tail)) {
2506 2522 // Redirect GC output to the file. -Xloggc:<filename>
2507 2523 // ostream_init_log(), when called will use this filename
2508 2524 // to initialize a fileStream.
2509 2525 _gc_log_filename = strdup(tail);
2510 2526 FLAG_SET_CMDLINE(bool, PrintGC, true);
2511 2527 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2512 2528
2513 2529 // JNI hooks
2514 2530 } else if (match_option(option, "-Xcheck", &tail)) {
2515 2531 if (!strcmp(tail, ":jni")) {
2516 2532 #if !INCLUDE_JNI_CHECK
2517 2533 warning("JNI CHECKING is not supported in this VM");
2518 2534 #else
2519 2535 CheckJNICalls = true;
2520 2536 #endif // INCLUDE_JNI_CHECK
2521 2537 } else if (is_bad_option(option, args->ignoreUnrecognized,
2522 2538 "check")) {
2523 2539 return JNI_EINVAL;
2524 2540 }
2525 2541 } else if (match_option(option, "vfprintf", &tail)) {
2526 2542 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2527 2543 } else if (match_option(option, "exit", &tail)) {
2528 2544 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2529 2545 } else if (match_option(option, "abort", &tail)) {
2530 2546 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2531 2547 // -XX:+AggressiveHeap
2532 2548 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2533 2549
2534 2550 // This option inspects the machine and attempts to set various
2535 2551 // parameters to be optimal for long-running, memory allocation
2536 2552 // intensive jobs. It is intended for machines with large
2537 2553 // amounts of cpu and memory.
2538 2554
2539 2555 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2540 2556 // VM, but we may not be able to represent the total physical memory
2541 2557 // available (like having 8gb of memory on a box but using a 32bit VM).
2542 2558 // Thus, we need to make sure we're using a julong for intermediate
2543 2559 // calculations.
2544 2560 julong initHeapSize;
2545 2561 julong total_memory = os::physical_memory();
2546 2562
2547 2563 if (total_memory < (julong)256*M) {
2548 2564 jio_fprintf(defaultStream::error_stream(),
2549 2565 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2550 2566 vm_exit(1);
2551 2567 }
2552 2568
2553 2569 // The heap size is half of available memory, or (at most)
2554 2570 // all of possible memory less 160mb (leaving room for the OS
2555 2571 // when using ISM). This is the maximum; because adaptive sizing
2556 2572 // is turned on below, the actual space used may be smaller.
2557 2573
2558 2574 initHeapSize = MIN2(total_memory / (julong)2,
2559 2575 total_memory - (julong)160*M);
2560 2576
2561 2577 // Make sure that if we have a lot of memory we cap the 32 bit
2562 2578 // process space. The 64bit VM version of this function is a nop.
2563 2579 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2564 2580
2565 2581 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2566 2582 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2567 2583 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2568 2584 // Currently the minimum size and the initial heap sizes are the same.
2569 2585 set_min_heap_size(initHeapSize);
2570 2586 }
2571 2587 if (FLAG_IS_DEFAULT(NewSize)) {
2572 2588 // Make the young generation 3/8ths of the total heap.
2573 2589 FLAG_SET_CMDLINE(uintx, NewSize,
2574 2590 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2575 2591 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2576 2592 }
2577 2593
2578 2594 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2579 2595 FLAG_SET_DEFAULT(UseLargePages, true);
2580 2596 #endif
2581 2597
2582 2598 // Increase some data structure sizes for efficiency
2583 2599 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2584 2600 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2585 2601 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2586 2602
2587 2603 // See the OldPLABSize comment below, but replace 'after promotion'
2588 2604 // with 'after copying'. YoungPLABSize is the size of the survivor
2589 2605 // space per-gc-thread buffers. The default is 4kw.
2590 2606 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2591 2607
2592 2608 // OldPLABSize is the size of the buffers in the old gen that
2593 2609 // UseParallelGC uses to promote live data that doesn't fit in the
2594 2610 // survivor spaces. At any given time, there's one for each gc thread.
2595 2611 // The default size is 1kw. These buffers are rarely used, since the
2596 2612 // survivor spaces are usually big enough. For specjbb, however, there
2597 2613 // are occasions when there's lots of live data in the young gen
2598 2614 // and we end up promoting some of it. We don't have a definite
2599 2615 // explanation for why bumping OldPLABSize helps, but the theory
2600 2616 // is that a bigger PLAB results in retaining something like the
2601 2617 // original allocation order after promotion, which improves mutator
2602 2618 // locality. A minor effect may be that larger PLABs reduce the
2603 2619 // number of PLAB allocation events during gc. The value of 8kw
2604 2620 // was arrived at by experimenting with specjbb.
2605 2621 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2606 2622
2607 2623 // Enable parallel GC and adaptive generation sizing
2608 2624 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2609 2625 FLAG_SET_DEFAULT(ParallelGCThreads,
2610 2626 Abstract_VM_Version::parallel_worker_threads());
2611 2627
2612 2628 // Encourage steady state memory management
2613 2629 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2614 2630
2615 2631 // This appears to improve mutator locality
2616 2632 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2617 2633
2618 2634 // Get around early Solaris scheduling bug
2619 2635 // (affinity vs other jobs on system)
2620 2636 // but disallow DR and offlining (5008695).
2621 2637 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2622 2638
2623 2639 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2624 2640 // The last option must always win.
2625 2641 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2626 2642 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2627 2643 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2628 2644 // The last option must always win.
2629 2645 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2630 2646 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2631 2647 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2632 2648 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2633 2649 jio_fprintf(defaultStream::error_stream(),
2634 2650 "Please use CMSClassUnloadingEnabled in place of "
2635 2651 "CMSPermGenSweepingEnabled in the future\n");
2636 2652 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2637 2653 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2638 2654 jio_fprintf(defaultStream::error_stream(),
2639 2655 "Please use -XX:+UseGCOverheadLimit in place of "
2640 2656 "-XX:+UseGCTimeLimit in the future\n");
2641 2657 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2642 2658 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2643 2659 jio_fprintf(defaultStream::error_stream(),
2644 2660 "Please use -XX:-UseGCOverheadLimit in place of "
2645 2661 "-XX:-UseGCTimeLimit in the future\n");
2646 2662 // The TLE options are for compatibility with 1.3 and will be
2647 2663 // removed without notice in a future release. These options
2648 2664 // are not to be documented.
2649 2665 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2650 2666 // No longer used.
2651 2667 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2652 2668 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2653 2669 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2654 2670 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2655 2671 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2656 2672 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2657 2673 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2658 2674 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2659 2675 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2660 2676 // No longer used.
2661 2677 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2662 2678 julong long_tlab_size = 0;
2663 2679 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2664 2680 if (errcode != arg_in_range) {
2665 2681 jio_fprintf(defaultStream::error_stream(),
2666 2682 "Invalid TLAB size: %s\n", option->optionString);
2667 2683 describe_range_error(errcode);
2668 2684 return JNI_EINVAL;
2669 2685 }
2670 2686 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2671 2687 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2672 2688 // No longer used.
2673 2689 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2674 2690 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2675 2691 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2676 2692 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2677 2693 SOLARIS_ONLY(
2678 2694 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2679 2695 warning("-XX:+UsePermISM is obsolete.");
2680 2696 FLAG_SET_CMDLINE(bool, UseISM, true);
2681 2697 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2682 2698 FLAG_SET_CMDLINE(bool, UseISM, false);
2683 2699 )
2684 2700 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2685 2701 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2686 2702 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2687 2703 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2688 2704 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2689 2705 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2690 2706 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2691 2707 #if defined(DTRACE_ENABLED)
2692 2708 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2693 2709 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2694 2710 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2695 2711 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2696 2712 #else // defined(DTRACE_ENABLED)
2697 2713 jio_fprintf(defaultStream::error_stream(),
2698 2714 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2699 2715 return JNI_EINVAL;
2700 2716 #endif // defined(DTRACE_ENABLED)
2701 2717 #ifdef ASSERT
2702 2718 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2703 2719 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2704 2720 // disable scavenge before parallel mark-compact
2705 2721 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2706 2722 #endif
2707 2723 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2708 2724 julong cms_blocks_to_claim = (julong)atol(tail);
2709 2725 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2710 2726 jio_fprintf(defaultStream::error_stream(),
2711 2727 "Please use -XX:OldPLABSize in place of "
2712 2728 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2713 2729 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2714 2730 julong cms_blocks_to_claim = (julong)atol(tail);
2715 2731 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2716 2732 jio_fprintf(defaultStream::error_stream(),
2717 2733 "Please use -XX:OldPLABSize in place of "
2718 2734 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2719 2735 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2720 2736 julong old_plab_size = 0;
2721 2737 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2722 2738 if (errcode != arg_in_range) {
2723 2739 jio_fprintf(defaultStream::error_stream(),
2724 2740 "Invalid old PLAB size: %s\n", option->optionString);
2725 2741 describe_range_error(errcode);
2726 2742 return JNI_EINVAL;
2727 2743 }
2728 2744 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2729 2745 jio_fprintf(defaultStream::error_stream(),
2730 2746 "Please use -XX:OldPLABSize in place of "
2731 2747 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2732 2748 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2733 2749 julong young_plab_size = 0;
2734 2750 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2735 2751 if (errcode != arg_in_range) {
2736 2752 jio_fprintf(defaultStream::error_stream(),
2737 2753 "Invalid young PLAB size: %s\n", option->optionString);
2738 2754 describe_range_error(errcode);
2739 2755 return JNI_EINVAL;
2740 2756 }
2741 2757 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2742 2758 jio_fprintf(defaultStream::error_stream(),
2743 2759 "Please use -XX:YoungPLABSize in place of "
2744 2760 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2745 2761 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2746 2762 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2747 2763 julong stack_size = 0;
2748 2764 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2749 2765 if (errcode != arg_in_range) {
2750 2766 jio_fprintf(defaultStream::error_stream(),
2751 2767 "Invalid mark stack size: %s\n", option->optionString);
2752 2768 describe_range_error(errcode);
2753 2769 return JNI_EINVAL;
2754 2770 }
2755 2771 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2756 2772 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2757 2773 julong max_stack_size = 0;
2758 2774 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2759 2775 if (errcode != arg_in_range) {
2760 2776 jio_fprintf(defaultStream::error_stream(),
2761 2777 "Invalid maximum mark stack size: %s\n",
2762 2778 option->optionString);
2763 2779 describe_range_error(errcode);
2764 2780 return JNI_EINVAL;
2765 2781 }
2766 2782 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2767 2783 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2768 2784 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2769 2785 uintx conc_threads = 0;
2770 2786 if (!parse_uintx(tail, &conc_threads, 1)) {
2771 2787 jio_fprintf(defaultStream::error_stream(),
2772 2788 "Invalid concurrent threads: %s\n", option->optionString);
2773 2789 return JNI_EINVAL;
2774 2790 }
2775 2791 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2776 2792 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
2777 2793 julong max_direct_memory_size = 0;
2778 2794 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
2779 2795 if (errcode != arg_in_range) {
2780 2796 jio_fprintf(defaultStream::error_stream(),
2781 2797 "Invalid maximum direct memory size: %s\n",
2782 2798 option->optionString);
2783 2799 describe_range_error(errcode);
2784 2800 return JNI_EINVAL;
2785 2801 }
2786 2802 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
2787 2803 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
2788 2804 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
2789 2805 // away and will cause VM initialization failures!
2790 2806 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
2791 2807 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
2792 2808 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2793 2809 // Skip -XX:Flags= since that case has already been handled
2794 2810 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2795 2811 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2796 2812 return JNI_EINVAL;
2797 2813 }
2798 2814 }
2799 2815 // Unknown option
2800 2816 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2801 2817 return JNI_ERR;
2802 2818 }
2803 2819 }
2804 2820
2805 2821 // Change the default value for flags which have different default values
2806 2822 // when working with older JDKs.
2807 2823 #ifdef LINUX
2808 2824 if (JDK_Version::current().compare_major(6) <= 0 &&
2809 2825 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2810 2826 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2811 2827 }
2812 2828 #endif // LINUX
2813 2829 return JNI_OK;
2814 2830 }
2815 2831
2816 2832 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2817 2833 // This must be done after all -D arguments have been processed.
2818 2834 scp_p->expand_endorsed();
2819 2835
2820 2836 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2821 2837 // Assemble the bootclasspath elements into the final path.
2822 2838 Arguments::set_sysclasspath(scp_p->combined_path());
2823 2839 }
2824 2840
2825 2841 // This must be done after all arguments have been processed.
2826 2842 // java_compiler() true means set to "NONE" or empty.
2827 2843 if (java_compiler() && !xdebug_mode()) {
2828 2844 // For backwards compatibility, we switch to interpreted mode if
2829 2845 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2830 2846 // not specified.
2831 2847 set_mode_flags(_int);
2832 2848 }
2833 2849 if (CompileThreshold == 0) {
2834 2850 set_mode_flags(_int);
2835 2851 }
2836 2852
2837 2853 #ifndef COMPILER2
2838 2854 // Don't degrade server performance for footprint
2839 2855 if (FLAG_IS_DEFAULT(UseLargePages) &&
2840 2856 MaxHeapSize < LargePageHeapSizeThreshold) {
2841 2857 // No need for large granularity pages w/small heaps.
2842 2858 // Note that large pages are enabled/disabled for both the
2843 2859 // Java heap and the code cache.
2844 2860 FLAG_SET_DEFAULT(UseLargePages, false);
2845 2861 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2846 2862 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2847 2863 }
2848 2864
2849 2865 // Tiered compilation is undefined with C1.
2850 2866 TieredCompilation = false;
2851 2867 #else
2852 2868 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2853 2869 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2854 2870 }
2855 2871 #endif
2856 2872
2857 2873 // If we are running in a headless jre, force java.awt.headless property
2858 2874 // to be true unless the property has already been set.
2859 2875 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2860 2876 if (os::is_headless_jre()) {
2861 2877 const char* headless = Arguments::get_property("java.awt.headless");
2862 2878 if (headless == NULL) {
2863 2879 char envbuffer[128];
2864 2880 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2865 2881 if (!add_property("java.awt.headless=true")) {
2866 2882 return JNI_ENOMEM;
2867 2883 }
2868 2884 } else {
2869 2885 char buffer[256];
2870 2886 strcpy(buffer, "java.awt.headless=");
2871 2887 strcat(buffer, envbuffer);
2872 2888 if (!add_property(buffer)) {
2873 2889 return JNI_ENOMEM;
2874 2890 }
2875 2891 }
2876 2892 }
2877 2893 }
2878 2894
2879 2895 if (!check_vm_args_consistency()) {
2880 2896 return JNI_ERR;
2881 2897 }
2882 2898
2883 2899 return JNI_OK;
2884 2900 }
2885 2901
2886 2902 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2887 2903 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2888 2904 scp_assembly_required_p);
2889 2905 }
2890 2906
2891 2907 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2892 2908 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2893 2909 scp_assembly_required_p);
2894 2910 }
2895 2911
2896 2912 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2897 2913 const int N_MAX_OPTIONS = 64;
2898 2914 const int OPTION_BUFFER_SIZE = 1024;
2899 2915 char buffer[OPTION_BUFFER_SIZE];
2900 2916
2901 2917 // The variable will be ignored if it exceeds the length of the buffer.
2902 2918 // Don't check this variable if user has special privileges
2903 2919 // (e.g. unix su command).
2904 2920 if (os::getenv(name, buffer, sizeof(buffer)) &&
2905 2921 !os::have_special_privileges()) {
2906 2922 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2907 2923 jio_fprintf(defaultStream::error_stream(),
2908 2924 "Picked up %s: %s\n", name, buffer);
2909 2925 char* rd = buffer; // pointer to the input string (rd)
2910 2926 int i;
2911 2927 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2912 2928 while (isspace(*rd)) rd++; // skip whitespace
2913 2929 if (*rd == 0) break; // we re done when the input string is read completely
2914 2930
2915 2931 // The output, option string, overwrites the input string.
2916 2932 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2917 2933 // input string (rd).
2918 2934 char* wrt = rd;
2919 2935
2920 2936 options[i++].optionString = wrt; // Fill in option
2921 2937 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2922 2938 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2923 2939 int quote = *rd; // matching quote to look for
2924 2940 rd++; // don't copy open quote
2925 2941 while (*rd != quote) { // include everything (even spaces) up until quote
2926 2942 if (*rd == 0) { // string termination means unmatched string
2927 2943 jio_fprintf(defaultStream::error_stream(),
2928 2944 "Unmatched quote in %s\n", name);
2929 2945 return JNI_ERR;
2930 2946 }
2931 2947 *wrt++ = *rd++; // copy to option string
2932 2948 }
2933 2949 rd++; // don't copy close quote
2934 2950 } else {
2935 2951 *wrt++ = *rd++; // copy to option string
2936 2952 }
2937 2953 }
2938 2954 // Need to check if we're done before writing a NULL,
2939 2955 // because the write could be to the byte that rd is pointing to.
2940 2956 if (*rd++ == 0) {
2941 2957 *wrt = 0;
2942 2958 break;
2943 2959 }
2944 2960 *wrt = 0; // Zero terminate option
2945 2961 }
2946 2962 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2947 2963 JavaVMInitArgs vm_args;
2948 2964 vm_args.version = JNI_VERSION_1_2;
2949 2965 vm_args.options = options;
2950 2966 vm_args.nOptions = i;
2951 2967 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2952 2968
2953 2969 if (PrintVMOptions) {
2954 2970 const char* tail;
2955 2971 for (int i = 0; i < vm_args.nOptions; i++) {
2956 2972 const JavaVMOption *option = vm_args.options + i;
2957 2973 if (match_option(option, "-XX:", &tail)) {
2958 2974 logOption(tail);
2959 2975 }
2960 2976 }
2961 2977 }
2962 2978
2963 2979 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2964 2980 }
2965 2981 return JNI_OK;
2966 2982 }
2967 2983
2968 2984 void Arguments::set_shared_spaces_flags() {
2969 2985 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
2970 2986 const bool might_share = must_share || UseSharedSpaces;
2971 2987
2972 2988 // CompressedOops cannot be used with CDS. The offsets of oopmaps and
2973 2989 // static fields are incorrect in the archive. With some more clever
2974 2990 // initialization, this restriction can probably be lifted.
2975 2991 // ??? UseLargePages might be okay now
2976 2992 const bool cannot_share = UseCompressedOops ||
2977 2993 (UseLargePages && FLAG_IS_CMDLINE(UseLargePages));
2978 2994 if (cannot_share) {
2979 2995 if (must_share) {
2980 2996 warning("disabling large pages %s"
2981 2997 "because of %s", "" LP64_ONLY("and compressed oops "),
2982 2998 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
2983 2999 FLAG_SET_CMDLINE(bool, UseLargePages, false);
2984 3000 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
2985 3001 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false));
2986 3002 } else {
2987 3003 // Prefer compressed oops and large pages to class data sharing
2988 3004 if (UseSharedSpaces && Verbose) {
2989 3005 warning("turning off use of shared archive because of large pages%s",
2990 3006 "" LP64_ONLY(" and/or compressed oops"));
2991 3007 }
2992 3008 no_shared_spaces();
2993 3009 }
2994 3010 } else if (UseLargePages && might_share) {
2995 3011 // Disable large pages to allow shared spaces. This is sub-optimal, since
2996 3012 // there may not even be a shared archive to use.
2997 3013 FLAG_SET_DEFAULT(UseLargePages, false);
2998 3014 }
2999 3015
3000 3016 // Add 2M to any size for SharedReadOnlySize to get around the JPRT setting
3001 3017 if (DumpSharedSpaces && !FLAG_IS_DEFAULT(SharedReadOnlySize)) {
3002 3018 SharedReadOnlySize = 14*M;
3003 3019 }
3004 3020
3005 3021 if (DumpSharedSpaces) {
3006 3022 if (RequireSharedSpaces) {
3007 3023 warning("cannot dump shared archive while using shared archive");
3008 3024 }
3009 3025 UseSharedSpaces = false;
3010 3026 }
3011 3027 }
3012 3028
3013 3029 // Disable options not supported in this release, with a warning if they
3014 3030 // were explicitly requested on the command-line
3015 3031 #define UNSUPPORTED_OPTION(opt, description) \
3016 3032 do { \
3017 3033 if (opt) { \
3018 3034 if (FLAG_IS_CMDLINE(opt)) { \
3019 3035 warning(description " is disabled in this release."); \
3020 3036 } \
3021 3037 FLAG_SET_DEFAULT(opt, false); \
3022 3038 } \
3023 3039 } while(0)
3024 3040
3025 3041 // Parse entry point called from JNI_CreateJavaVM
3026 3042
3027 3043 jint Arguments::parse(const JavaVMInitArgs* args) {
3028 3044
3029 3045 // Sharing support
3030 3046 // Construct the path to the archive
3031 3047 char jvm_path[JVM_MAXPATHLEN];
3032 3048 os::jvm_path(jvm_path, sizeof(jvm_path));
3033 3049 char *end = strrchr(jvm_path, *os::file_separator());
3034 3050 if (end != NULL) *end = '\0';
3035 3051 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
3036 3052 strlen(os::file_separator()) + 20, mtInternal);
3037 3053 if (shared_archive_path == NULL) return JNI_ENOMEM;
3038 3054 strcpy(shared_archive_path, jvm_path);
3039 3055 strcat(shared_archive_path, os::file_separator());
3040 3056 strcat(shared_archive_path, "classes");
3041 3057 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
3042 3058 strcat(shared_archive_path, ".jsa");
3043 3059 SharedArchivePath = shared_archive_path;
3044 3060
3045 3061 // Remaining part of option string
3046 3062 const char* tail;
3047 3063
3048 3064 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3049 3065 const char* hotspotrc = ".hotspotrc";
3050 3066 bool settings_file_specified = false;
3051 3067 bool needs_hotspotrc_warning = false;
3052 3068
3053 3069 const char* flags_file;
3054 3070 int index;
3055 3071 for (index = 0; index < args->nOptions; index++) {
3056 3072 const JavaVMOption *option = args->options + index;
3057 3073 if (match_option(option, "-XX:Flags=", &tail)) {
3058 3074 flags_file = tail;
3059 3075 settings_file_specified = true;
3060 3076 }
3061 3077 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3062 3078 PrintVMOptions = true;
3063 3079 }
3064 3080 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3065 3081 PrintVMOptions = false;
3066 3082 }
3067 3083 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3068 3084 IgnoreUnrecognizedVMOptions = true;
3069 3085 }
3070 3086 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3071 3087 IgnoreUnrecognizedVMOptions = false;
3072 3088 }
3073 3089 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3074 3090 CommandLineFlags::printFlags(tty, false);
3075 3091 vm_exit(0);
3076 3092 }
3077 3093 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3078 3094 #if INCLUDE_NMT
3079 3095 MemTracker::init_tracking_options(tail);
3080 3096 #else
3081 3097 warning("Native Memory Tracking is not supported in this VM");
3082 3098 #endif
3083 3099 }
3084 3100
3085 3101
3086 3102 #ifndef PRODUCT
3087 3103 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3088 3104 CommandLineFlags::printFlags(tty, true);
3089 3105 vm_exit(0);
3090 3106 }
3091 3107 #endif
3092 3108 }
3093 3109
3094 3110 if (IgnoreUnrecognizedVMOptions) {
3095 3111 // uncast const to modify the flag args->ignoreUnrecognized
3096 3112 *(jboolean*)(&args->ignoreUnrecognized) = true;
3097 3113 }
3098 3114
3099 3115 // Parse specified settings file
3100 3116 if (settings_file_specified) {
3101 3117 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3102 3118 return JNI_EINVAL;
3103 3119 }
3104 3120 } else {
3105 3121 #ifdef ASSERT
3106 3122 // Parse default .hotspotrc settings file
3107 3123 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3108 3124 return JNI_EINVAL;
3109 3125 }
3110 3126 #else
3111 3127 struct stat buf;
3112 3128 if (os::stat(hotspotrc, &buf) == 0) {
3113 3129 needs_hotspotrc_warning = true;
3114 3130 }
3115 3131 #endif
3116 3132 }
3117 3133
3118 3134 if (PrintVMOptions) {
3119 3135 for (index = 0; index < args->nOptions; index++) {
3120 3136 const JavaVMOption *option = args->options + index;
3121 3137 if (match_option(option, "-XX:", &tail)) {
3122 3138 logOption(tail);
3123 3139 }
3124 3140 }
3125 3141 }
3126 3142
3127 3143 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3128 3144 jint result = parse_vm_init_args(args);
3129 3145 if (result != JNI_OK) {
3130 3146 return result;
3131 3147 }
3132 3148
3133 3149 // Delay warning until here so that we've had a chance to process
3134 3150 // the -XX:-PrintWarnings flag
3135 3151 if (needs_hotspotrc_warning) {
3136 3152 warning("%s file is present but has been ignored. "
3137 3153 "Run with -XX:Flags=%s to load the file.",
3138 3154 hotspotrc, hotspotrc);
3139 3155 }
3140 3156
3141 3157 #if (defined JAVASE_EMBEDDED || defined ARM)
3142 3158 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3143 3159 #endif
3144 3160
3145 3161 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3146 3162 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3147 3163 #endif
3148 3164
3149 3165 #if !INCLUDE_ALTERNATE_GCS
3150 3166 if (UseParallelGC) {
3151 3167 warning("Parallel GC is not supported in this VM. Using Serial GC.");
3152 3168 }
3153 3169 if (UseParallelOldGC) {
3154 3170 warning("Parallel Old GC is not supported in this VM. Using Serial GC.");
3155 3171 }
3156 3172 if (UseConcMarkSweepGC) {
3157 3173 warning("Concurrent Mark Sweep GC is not supported in this VM. Using Serial GC.");
3158 3174 }
3159 3175 if (UseParNewGC) {
3160 3176 warning("Par New GC is not supported in this VM. Using Serial GC.");
3161 3177 }
3162 3178 #endif // INCLUDE_ALTERNATE_GCS
3163 3179
3164 3180 #ifndef PRODUCT
3165 3181 if (TraceBytecodesAt != 0) {
3166 3182 TraceBytecodes = true;
3167 3183 }
3168 3184 if (CountCompiledCalls) {
3169 3185 if (UseCounterDecay) {
3170 3186 warning("UseCounterDecay disabled because CountCalls is set");
3171 3187 UseCounterDecay = false;
3172 3188 }
3173 3189 }
3174 3190 #endif // PRODUCT
3175 3191
3176 3192 // JSR 292 is not supported before 1.7
3177 3193 if (!JDK_Version::is_gte_jdk17x_version()) {
3178 3194 if (EnableInvokeDynamic) {
3179 3195 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3180 3196 warning("JSR 292 is not supported before 1.7. Disabling support.");
3181 3197 }
3182 3198 EnableInvokeDynamic = false;
3183 3199 }
3184 3200 }
3185 3201
3186 3202 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3187 3203 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3188 3204 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3189 3205 }
3190 3206 ScavengeRootsInCode = 1;
3191 3207 }
3192 3208
3193 3209 if (PrintGCDetails) {
3194 3210 // Turn on -verbose:gc options as well
3195 3211 PrintGC = true;
3196 3212 }
3197 3213
3198 3214 if (!JDK_Version::is_gte_jdk18x_version()) {
3199 3215 // To avoid changing the log format for 7 updates this flag is only
3200 3216 // true by default in JDK8 and above.
3201 3217 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3202 3218 FLAG_SET_DEFAULT(PrintGCCause, false);
3203 3219 }
3204 3220 }
3205 3221
3206 3222 // Set object alignment values.
3207 3223 set_object_alignment();
3208 3224
3209 3225 #ifdef SERIALGC
3210 3226 force_serial_gc();
3211 3227 #endif // SERIALGC
3212 3228 #if !INCLUDE_CDS
3213 3229 no_shared_spaces();
3214 3230 #endif // INCLUDE_CDS
3215 3231
3216 3232 // Set flags based on ergonomics.
3217 3233 set_ergonomics_flags();
3218 3234
3219 3235 set_shared_spaces_flags();
3220 3236
3221 3237 // Check the GC selections again.
3222 3238 if (!check_gc_consistency()) {
3223 3239 return JNI_EINVAL;
3224 3240 }
3225 3241
3226 3242 if (TieredCompilation) {
3227 3243 set_tiered_flags();
3228 3244 } else {
3229 3245 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3230 3246 if (CompilationPolicyChoice >= 2) {
3231 3247 vm_exit_during_initialization(
3232 3248 "Incompatible compilation policy selected", NULL);
3233 3249 }
3234 3250 }
3235 3251
3236 3252 // Set heap size based on available physical memory
3237 3253 set_heap_size();
3238 3254
3239 3255 #if INCLUDE_ALTERNATE_GCS
3240 3256 // Set per-collector flags
3241 3257 if (UseParallelGC || UseParallelOldGC) {
3242 3258 set_parallel_gc_flags();
3243 3259 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3244 3260 set_cms_and_parnew_gc_flags();
3245 3261 } else if (UseParNewGC) { // skipped if CMS is set above
3246 3262 set_parnew_gc_flags();
3247 3263 } else if (UseG1GC) {
3248 3264 set_g1_gc_flags();
3249 3265 }
3250 3266 #endif // INCLUDE_ALTERNATE_GCS
3251 3267
3252 3268 #ifdef SERIALGC
3253 3269 assert(verify_serial_gc_flags(), "SerialGC unset");
3254 3270 #endif // SERIALGC
3255 3271
3256 3272 // Set bytecode rewriting flags
3257 3273 set_bytecode_flags();
3258 3274
3259 3275 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3260 3276 set_aggressive_opts_flags();
3261 3277
3262 3278 // Turn off biased locking for locking debug mode flags,
3263 3279 // which are subtlely different from each other but neither works with
3264 3280 // biased locking.
3265 3281 if (UseHeavyMonitors
3266 3282 #ifdef COMPILER1
3267 3283 || !UseFastLocking
3268 3284 #endif // COMPILER1
3269 3285 ) {
3270 3286 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3271 3287 // flag set to true on command line; warn the user that they
3272 3288 // can't enable biased locking here
3273 3289 warning("Biased Locking is not supported with locking debug flags"
3274 3290 "; ignoring UseBiasedLocking flag." );
3275 3291 }
3276 3292 UseBiasedLocking = false;
3277 3293 }
3278 3294
3279 3295 #ifdef CC_INTERP
3280 3296 // Clear flags not supported by the C++ interpreter
3281 3297 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3282 3298 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3283 3299 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3284 3300 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false));
3285 3301 #endif // CC_INTERP
3286 3302
3287 3303 #ifdef COMPILER2
3288 3304 if (!UseBiasedLocking || EmitSync != 0) {
3289 3305 UseOptoBiasInlining = false;
3290 3306 }
3291 3307 if (!EliminateLocks) {
3292 3308 EliminateNestedLocks = false;
3293 3309 }
3294 3310 #endif
3295 3311
3296 3312 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3297 3313 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3298 3314 DebugNonSafepoints = true;
3299 3315 }
3300 3316
3301 3317 #ifndef PRODUCT
3302 3318 if (CompileTheWorld) {
3303 3319 // Force NmethodSweeper to sweep whole CodeCache each time.
3304 3320 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3305 3321 NmethodSweepFraction = 1;
3306 3322 }
3307 3323 }
3308 3324 #endif
3309 3325
3310 3326 if (PrintCommandLineFlags) {
3311 3327 CommandLineFlags::printSetFlags(tty);
3312 3328 }
3313 3329
3314 3330 // Apply CPU specific policy for the BiasedLocking
3315 3331 if (UseBiasedLocking) {
3316 3332 if (!VM_Version::use_biased_locking() &&
3317 3333 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3318 3334 UseBiasedLocking = false;
3319 3335 }
3320 3336 }
3321 3337
3322 3338 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3323 3339 // but only if not already set on the commandline
3324 3340 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3325 3341 bool set = false;
3326 3342 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3327 3343 if (!set) {
3328 3344 FLAG_SET_DEFAULT(PauseAtExit, true);
3329 3345 }
3330 3346 }
3331 3347
3332 3348 return JNI_OK;
3333 3349 }
3334 3350
3335 3351 jint Arguments::adjust_after_os() {
3336 3352 #if INCLUDE_ALTERNATE_GCS
3337 3353 if (UseParallelGC || UseParallelOldGC) {
3338 3354 if (UseNUMA) {
3339 3355 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3340 3356 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3341 3357 }
3342 3358 // For those collectors or operating systems (eg, Windows) that do
3343 3359 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3344 3360 UseNUMAInterleaving = true;
3345 3361 }
3346 3362 }
3347 3363 #endif
3348 3364 return JNI_OK;
3349 3365 }
3350 3366
3351 3367 int Arguments::PropertyList_count(SystemProperty* pl) {
3352 3368 int count = 0;
3353 3369 while(pl != NULL) {
3354 3370 count++;
3355 3371 pl = pl->next();
3356 3372 }
3357 3373 return count;
3358 3374 }
3359 3375
3360 3376 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3361 3377 assert(key != NULL, "just checking");
3362 3378 SystemProperty* prop;
3363 3379 for (prop = pl; prop != NULL; prop = prop->next()) {
3364 3380 if (strcmp(key, prop->key()) == 0) return prop->value();
3365 3381 }
3366 3382 return NULL;
3367 3383 }
3368 3384
3369 3385 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3370 3386 int count = 0;
3371 3387 const char* ret_val = NULL;
3372 3388
3373 3389 while(pl != NULL) {
3374 3390 if(count >= index) {
3375 3391 ret_val = pl->key();
3376 3392 break;
3377 3393 }
3378 3394 count++;
3379 3395 pl = pl->next();
3380 3396 }
3381 3397
3382 3398 return ret_val;
3383 3399 }
3384 3400
3385 3401 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3386 3402 int count = 0;
3387 3403 char* ret_val = NULL;
3388 3404
3389 3405 while(pl != NULL) {
3390 3406 if(count >= index) {
3391 3407 ret_val = pl->value();
3392 3408 break;
3393 3409 }
3394 3410 count++;
3395 3411 pl = pl->next();
3396 3412 }
3397 3413
3398 3414 return ret_val;
3399 3415 }
3400 3416
3401 3417 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3402 3418 SystemProperty* p = *plist;
3403 3419 if (p == NULL) {
3404 3420 *plist = new_p;
3405 3421 } else {
3406 3422 while (p->next() != NULL) {
3407 3423 p = p->next();
3408 3424 }
3409 3425 p->set_next(new_p);
3410 3426 }
3411 3427 }
3412 3428
3413 3429 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3414 3430 if (plist == NULL)
3415 3431 return;
3416 3432
3417 3433 SystemProperty* new_p = new SystemProperty(k, v, true);
3418 3434 PropertyList_add(plist, new_p);
3419 3435 }
3420 3436
3421 3437 // This add maintains unique property key in the list.
3422 3438 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3423 3439 if (plist == NULL)
3424 3440 return;
3425 3441
3426 3442 // If property key exist then update with new value.
3427 3443 SystemProperty* prop;
3428 3444 for (prop = *plist; prop != NULL; prop = prop->next()) {
3429 3445 if (strcmp(k, prop->key()) == 0) {
3430 3446 if (append) {
3431 3447 prop->append_value(v);
3432 3448 } else {
3433 3449 prop->set_value(v);
3434 3450 }
3435 3451 return;
3436 3452 }
3437 3453 }
3438 3454
3439 3455 PropertyList_add(plist, k, v);
3440 3456 }
3441 3457
3442 3458 #ifdef KERNEL
3443 3459 char *Arguments::get_kernel_properties() {
3444 3460 // Find properties starting with kernel and append them to string
3445 3461 // We need to find out how long they are first because the URL's that they
3446 3462 // might point to could get long.
3447 3463 int length = 0;
3448 3464 SystemProperty* prop;
3449 3465 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3450 3466 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3451 3467 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3452 3468 }
3453 3469 }
3454 3470 // Add one for null terminator.
3455 3471 char *props = AllocateHeap(length + 1, mtInternal);
3456 3472 if (length != 0) {
3457 3473 int pos = 0;
3458 3474 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3459 3475 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3460 3476 jio_snprintf(&props[pos], length-pos,
3461 3477 "-D%s=%s ", prop->key(), prop->value());
3462 3478 pos = strlen(props);
3463 3479 }
3464 3480 }
3465 3481 }
3466 3482 // null terminate props in case of null
3467 3483 props[length] = '\0';
3468 3484 return props;
3469 3485 }
3470 3486 #endif // KERNEL
3471 3487
3472 3488 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3473 3489 // Returns true if all of the source pointed by src has been copied over to
3474 3490 // the destination buffer pointed by buf. Otherwise, returns false.
3475 3491 // Notes:
3476 3492 // 1. If the length (buflen) of the destination buffer excluding the
3477 3493 // NULL terminator character is not long enough for holding the expanded
3478 3494 // pid characters, it also returns false instead of returning the partially
3479 3495 // expanded one.
3480 3496 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3481 3497 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3482 3498 char* buf, size_t buflen) {
3483 3499 const char* p = src;
3484 3500 char* b = buf;
3485 3501 const char* src_end = &src[srclen];
3486 3502 char* buf_end = &buf[buflen - 1];
3487 3503
3488 3504 while (p < src_end && b < buf_end) {
3489 3505 if (*p == '%') {
3490 3506 switch (*(++p)) {
3491 3507 case '%': // "%%" ==> "%"
3492 3508 *b++ = *p++;
3493 3509 break;
3494 3510 case 'p': { // "%p" ==> current process id
3495 3511 // buf_end points to the character before the last character so
3496 3512 // that we could write '\0' to the end of the buffer.
3497 3513 size_t buf_sz = buf_end - b + 1;
3498 3514 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3499 3515
3500 3516 // if jio_snprintf fails or the buffer is not long enough to hold
3501 3517 // the expanded pid, returns false.
3502 3518 if (ret < 0 || ret >= (int)buf_sz) {
3503 3519 return false;
3504 3520 } else {
3505 3521 b += ret;
3506 3522 assert(*b == '\0', "fail in copy_expand_pid");
3507 3523 if (p == src_end && b == buf_end + 1) {
3508 3524 // reach the end of the buffer.
3509 3525 return true;
3510 3526 }
3511 3527 }
3512 3528 p++;
3513 3529 break;
3514 3530 }
3515 3531 default :
3516 3532 *b++ = '%';
3517 3533 }
3518 3534 } else {
3519 3535 *b++ = *p++;
3520 3536 }
3521 3537 }
3522 3538 *b = '\0';
3523 3539 return (p == src_end); // return false if not all of the source was copied
3524 3540 }
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