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--- old/src/share/vm/runtime/arguments.cpp
+++ new/src/share/vm/runtime/arguments.cpp
1 1 /*
2 2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 4 *
5 5 * This code is free software; you can redistribute it and/or modify it
6 6 * under the terms of the GNU General Public License version 2 only, as
7 7 * published by the Free Software Foundation.
8 8 *
9 9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 12 * version 2 for more details (a copy is included in the LICENSE file that
13 13 * accompanied this code).
14 14 *
15 15 * You should have received a copy of the GNU General Public License version
16 16 * 2 along with this work; if not, write to the Free Software Foundation,
17 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 18 *
19 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 20 * or visit www.oracle.com if you need additional information or have any
21 21 * questions.
22 22 *
23 23 */
24 24
25 25 #include "precompiled.hpp"
26 26 #include "classfile/javaAssertions.hpp"
27 27 #include "compiler/compilerOracle.hpp"
28 28 #include "memory/allocation.inline.hpp"
29 29 #include "memory/cardTableRS.hpp"
30 30 #include "memory/referenceProcessor.hpp"
31 31 #include "memory/universe.inline.hpp"
32 32 #include "oops/oop.inline.hpp"
33 33 #include "prims/jvmtiExport.hpp"
34 34 #include "runtime/arguments.hpp"
35 35 #include "runtime/globals_extension.hpp"
36 36 #include "runtime/java.hpp"
37 37 #include "services/management.hpp"
38 38 #include "utilities/defaultStream.hpp"
39 39 #include "utilities/taskqueue.hpp"
40 40 #ifdef TARGET_OS_FAMILY_linux
41 41 # include "os_linux.inline.hpp"
42 42 #endif
43 43 #ifdef TARGET_OS_FAMILY_solaris
44 44 # include "os_solaris.inline.hpp"
45 45 #endif
46 46 #ifdef TARGET_OS_FAMILY_windows
47 47 # include "os_windows.inline.hpp"
48 48 #endif
49 49 #ifdef TARGET_OS_FAMILY_bsd
50 50 # include "os_bsd.inline.hpp"
51 51 #endif
52 52 #ifndef SERIALGC
53 53 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
54 54 #endif
55 55
56 56 // Note: This is a special bug reporting site for the JVM
57 57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
58 58 #define DEFAULT_JAVA_LAUNCHER "generic"
59 59
60 60 char** Arguments::_jvm_flags_array = NULL;
61 61 int Arguments::_num_jvm_flags = 0;
62 62 char** Arguments::_jvm_args_array = NULL;
63 63 int Arguments::_num_jvm_args = 0;
64 64 char* Arguments::_java_command = NULL;
65 65 SystemProperty* Arguments::_system_properties = NULL;
66 66 const char* Arguments::_gc_log_filename = NULL;
67 67 bool Arguments::_has_profile = false;
68 68 bool Arguments::_has_alloc_profile = false;
69 69 uintx Arguments::_min_heap_size = 0;
70 70 Arguments::Mode Arguments::_mode = _mixed;
71 71 bool Arguments::_java_compiler = false;
72 72 bool Arguments::_xdebug_mode = false;
73 73 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
74 74 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
75 75 int Arguments::_sun_java_launcher_pid = -1;
76 76 bool Arguments::_created_by_gamma_launcher = false;
77 77
78 78 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
79 79 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
80 80 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
81 81 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
82 82 bool Arguments::_ClipInlining = ClipInlining;
83 83
84 84 char* Arguments::SharedArchivePath = NULL;
85 85
86 86 AgentLibraryList Arguments::_libraryList;
87 87 AgentLibraryList Arguments::_agentList;
88 88
89 89 abort_hook_t Arguments::_abort_hook = NULL;
90 90 exit_hook_t Arguments::_exit_hook = NULL;
91 91 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
92 92
93 93
94 94 SystemProperty *Arguments::_java_ext_dirs = NULL;
95 95 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
96 96 SystemProperty *Arguments::_sun_boot_library_path = NULL;
97 97 SystemProperty *Arguments::_java_library_path = NULL;
98 98 SystemProperty *Arguments::_java_home = NULL;
99 99 SystemProperty *Arguments::_java_class_path = NULL;
100 100 SystemProperty *Arguments::_sun_boot_class_path = NULL;
101 101
102 102 char* Arguments::_meta_index_path = NULL;
103 103 char* Arguments::_meta_index_dir = NULL;
104 104
105 105 static bool force_client_mode = false;
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 #ifdef PRODUCT
250 250 { "DesiredMethodLimit",
251 251 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
252 252 #endif // PRODUCT
253 253 { NULL, JDK_Version(0), JDK_Version(0) }
254 254 };
255 255
256 256 // Returns true if the flag is obsolete and fits into the range specified
257 257 // for being ignored. In the case that the flag is ignored, the 'version'
258 258 // value is filled in with the version number when the flag became
259 259 // obsolete so that that value can be displayed to the user.
260 260 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
261 261 int i = 0;
262 262 assert(version != NULL, "Must provide a version buffer");
263 263 while (obsolete_jvm_flags[i].name != NULL) {
264 264 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
265 265 // <flag>=xxx form
266 266 // [-|+]<flag> form
267 267 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
268 268 ((s[0] == '+' || s[0] == '-') &&
269 269 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
270 270 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
271 271 *version = flag_status.obsoleted_in;
272 272 return true;
273 273 }
274 274 }
275 275 i++;
276 276 }
277 277 return false;
278 278 }
279 279
280 280 // Constructs the system class path (aka boot class path) from the following
281 281 // components, in order:
282 282 //
283 283 // prefix // from -Xbootclasspath/p:...
284 284 // endorsed // the expansion of -Djava.endorsed.dirs=...
285 285 // base // from os::get_system_properties() or -Xbootclasspath=
286 286 // suffix // from -Xbootclasspath/a:...
287 287 //
288 288 // java.endorsed.dirs is a list of directories; any jar or zip files in the
289 289 // directories are added to the sysclasspath just before the base.
290 290 //
291 291 // This could be AllStatic, but it isn't needed after argument processing is
292 292 // complete.
293 293 class SysClassPath: public StackObj {
294 294 public:
295 295 SysClassPath(const char* base);
296 296 ~SysClassPath();
297 297
298 298 inline void set_base(const char* base);
299 299 inline void add_prefix(const char* prefix);
300 300 inline void add_suffix_to_prefix(const char* suffix);
301 301 inline void add_suffix(const char* suffix);
302 302 inline void reset_path(const char* base);
303 303
304 304 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
305 305 // property. Must be called after all command-line arguments have been
306 306 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
307 307 // combined_path().
308 308 void expand_endorsed();
309 309
310 310 inline const char* get_base() const { return _items[_scp_base]; }
311 311 inline const char* get_prefix() const { return _items[_scp_prefix]; }
312 312 inline const char* get_suffix() const { return _items[_scp_suffix]; }
313 313 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
314 314
315 315 // Combine all the components into a single c-heap-allocated string; caller
316 316 // must free the string if/when no longer needed.
317 317 char* combined_path();
318 318
319 319 private:
320 320 // Utility routines.
321 321 static char* add_to_path(const char* path, const char* str, bool prepend);
322 322 static char* add_jars_to_path(char* path, const char* directory);
323 323
324 324 inline void reset_item_at(int index);
325 325
326 326 // Array indices for the items that make up the sysclasspath. All except the
327 327 // base are allocated in the C heap and freed by this class.
328 328 enum {
329 329 _scp_prefix, // from -Xbootclasspath/p:...
330 330 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
331 331 _scp_base, // the default sysclasspath
332 332 _scp_suffix, // from -Xbootclasspath/a:...
333 333 _scp_nitems // the number of items, must be last.
334 334 };
335 335
336 336 const char* _items[_scp_nitems];
337 337 DEBUG_ONLY(bool _expansion_done;)
338 338 };
339 339
340 340 SysClassPath::SysClassPath(const char* base) {
341 341 memset(_items, 0, sizeof(_items));
342 342 _items[_scp_base] = base;
343 343 DEBUG_ONLY(_expansion_done = false;)
344 344 }
345 345
346 346 SysClassPath::~SysClassPath() {
347 347 // Free everything except the base.
348 348 for (int i = 0; i < _scp_nitems; ++i) {
349 349 if (i != _scp_base) reset_item_at(i);
350 350 }
351 351 DEBUG_ONLY(_expansion_done = false;)
352 352 }
353 353
354 354 inline void SysClassPath::set_base(const char* base) {
355 355 _items[_scp_base] = base;
356 356 }
357 357
358 358 inline void SysClassPath::add_prefix(const char* prefix) {
359 359 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
360 360 }
361 361
362 362 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
363 363 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
364 364 }
365 365
366 366 inline void SysClassPath::add_suffix(const char* suffix) {
367 367 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
368 368 }
369 369
370 370 inline void SysClassPath::reset_item_at(int index) {
371 371 assert(index < _scp_nitems && index != _scp_base, "just checking");
372 372 if (_items[index] != NULL) {
373 373 FREE_C_HEAP_ARRAY(char, _items[index]);
374 374 _items[index] = NULL;
375 375 }
376 376 }
377 377
378 378 inline void SysClassPath::reset_path(const char* base) {
379 379 // Clear the prefix and suffix.
380 380 reset_item_at(_scp_prefix);
381 381 reset_item_at(_scp_suffix);
382 382 set_base(base);
383 383 }
384 384
385 385 //------------------------------------------------------------------------------
386 386
387 387 void SysClassPath::expand_endorsed() {
388 388 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
389 389
390 390 const char* path = Arguments::get_property("java.endorsed.dirs");
391 391 if (path == NULL) {
392 392 path = Arguments::get_endorsed_dir();
393 393 assert(path != NULL, "no default for java.endorsed.dirs");
394 394 }
395 395
396 396 char* expanded_path = NULL;
397 397 const char separator = *os::path_separator();
398 398 const char* const end = path + strlen(path);
399 399 while (path < end) {
400 400 const char* tmp_end = strchr(path, separator);
401 401 if (tmp_end == NULL) {
402 402 expanded_path = add_jars_to_path(expanded_path, path);
403 403 path = end;
404 404 } else {
405 405 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
406 406 memcpy(dirpath, path, tmp_end - path);
407 407 dirpath[tmp_end - path] = '\0';
408 408 expanded_path = add_jars_to_path(expanded_path, dirpath);
409 409 FREE_C_HEAP_ARRAY(char, dirpath);
410 410 path = tmp_end + 1;
411 411 }
412 412 }
413 413 _items[_scp_endorsed] = expanded_path;
414 414 DEBUG_ONLY(_expansion_done = true;)
415 415 }
416 416
417 417 // Combine the bootclasspath elements, some of which may be null, into a single
418 418 // c-heap-allocated string.
419 419 char* SysClassPath::combined_path() {
420 420 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
421 421 assert(_expansion_done, "must call expand_endorsed() first.");
422 422
423 423 size_t lengths[_scp_nitems];
424 424 size_t total_len = 0;
425 425
426 426 const char separator = *os::path_separator();
427 427
428 428 // Get the lengths.
429 429 int i;
430 430 for (i = 0; i < _scp_nitems; ++i) {
431 431 if (_items[i] != NULL) {
432 432 lengths[i] = strlen(_items[i]);
433 433 // Include space for the separator char (or a NULL for the last item).
434 434 total_len += lengths[i] + 1;
435 435 }
436 436 }
437 437 assert(total_len > 0, "empty sysclasspath not allowed");
438 438
439 439 // Copy the _items to a single string.
440 440 char* cp = NEW_C_HEAP_ARRAY(char, total_len);
441 441 char* cp_tmp = cp;
442 442 for (i = 0; i < _scp_nitems; ++i) {
443 443 if (_items[i] != NULL) {
444 444 memcpy(cp_tmp, _items[i], lengths[i]);
445 445 cp_tmp += lengths[i];
446 446 *cp_tmp++ = separator;
447 447 }
448 448 }
449 449 *--cp_tmp = '\0'; // Replace the extra separator.
450 450 return cp;
451 451 }
452 452
453 453 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
454 454 char*
455 455 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
456 456 char *cp;
457 457
458 458 assert(str != NULL, "just checking");
459 459 if (path == NULL) {
460 460 size_t len = strlen(str) + 1;
461 461 cp = NEW_C_HEAP_ARRAY(char, len);
462 462 memcpy(cp, str, len); // copy the trailing null
463 463 } else {
464 464 const char separator = *os::path_separator();
465 465 size_t old_len = strlen(path);
466 466 size_t str_len = strlen(str);
467 467 size_t len = old_len + str_len + 2;
468 468
469 469 if (prepend) {
470 470 cp = NEW_C_HEAP_ARRAY(char, len);
471 471 char* cp_tmp = cp;
472 472 memcpy(cp_tmp, str, str_len);
473 473 cp_tmp += str_len;
474 474 *cp_tmp = separator;
475 475 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
476 476 FREE_C_HEAP_ARRAY(char, path);
477 477 } else {
478 478 cp = REALLOC_C_HEAP_ARRAY(char, path, len);
479 479 char* cp_tmp = cp + old_len;
480 480 *cp_tmp = separator;
481 481 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
482 482 }
483 483 }
484 484 return cp;
485 485 }
486 486
487 487 // Scan the directory and append any jar or zip files found to path.
488 488 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
489 489 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
490 490 DIR* dir = os::opendir(directory);
491 491 if (dir == NULL) return path;
492 492
493 493 char dir_sep[2] = { '\0', '\0' };
494 494 size_t directory_len = strlen(directory);
495 495 const char fileSep = *os::file_separator();
496 496 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
497 497
498 498 /* Scan the directory for jars/zips, appending them to path. */
499 499 struct dirent *entry;
500 500 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
501 501 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
502 502 const char* name = entry->d_name;
503 503 const char* ext = name + strlen(name) - 4;
504 504 bool isJarOrZip = ext > name &&
505 505 (os::file_name_strcmp(ext, ".jar") == 0 ||
506 506 os::file_name_strcmp(ext, ".zip") == 0);
507 507 if (isJarOrZip) {
508 508 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
509 509 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
510 510 path = add_to_path(path, jarpath, false);
511 511 FREE_C_HEAP_ARRAY(char, jarpath);
512 512 }
513 513 }
514 514 FREE_C_HEAP_ARRAY(char, dbuf);
515 515 os::closedir(dir);
516 516 return path;
517 517 }
518 518
519 519 // Parses a memory size specification string.
520 520 static bool atomull(const char *s, julong* result) {
521 521 julong n = 0;
522 522 int args_read = sscanf(s, os::julong_format_specifier(), &n);
523 523 if (args_read != 1) {
524 524 return false;
525 525 }
526 526 while (*s != '\0' && isdigit(*s)) {
527 527 s++;
528 528 }
529 529 // 4705540: illegal if more characters are found after the first non-digit
530 530 if (strlen(s) > 1) {
531 531 return false;
532 532 }
533 533 switch (*s) {
534 534 case 'T': case 't':
535 535 *result = n * G * K;
536 536 // Check for overflow.
537 537 if (*result/((julong)G * K) != n) return false;
538 538 return true;
539 539 case 'G': case 'g':
540 540 *result = n * G;
541 541 if (*result/G != n) return false;
542 542 return true;
543 543 case 'M': case 'm':
544 544 *result = n * M;
545 545 if (*result/M != n) return false;
546 546 return true;
547 547 case 'K': case 'k':
548 548 *result = n * K;
549 549 if (*result/K != n) return false;
550 550 return true;
551 551 case '\0':
552 552 *result = n;
553 553 return true;
554 554 default:
555 555 return false;
556 556 }
557 557 }
558 558
559 559 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
560 560 if (size < min_size) return arg_too_small;
561 561 // Check that size will fit in a size_t (only relevant on 32-bit)
562 562 if (size > max_uintx) return arg_too_big;
563 563 return arg_in_range;
564 564 }
565 565
566 566 // Describe an argument out of range error
567 567 void Arguments::describe_range_error(ArgsRange errcode) {
568 568 switch(errcode) {
569 569 case arg_too_big:
570 570 jio_fprintf(defaultStream::error_stream(),
571 571 "The specified size exceeds the maximum "
572 572 "representable size.\n");
573 573 break;
574 574 case arg_too_small:
575 575 case arg_unreadable:
576 576 case arg_in_range:
577 577 // do nothing for now
578 578 break;
579 579 default:
580 580 ShouldNotReachHere();
581 581 }
582 582 }
583 583
584 584 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
585 585 return CommandLineFlags::boolAtPut(name, &value, origin);
586 586 }
587 587
588 588 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
589 589 double v;
590 590 if (sscanf(value, "%lf", &v) != 1) {
591 591 return false;
592 592 }
593 593
594 594 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
595 595 return true;
596 596 }
597 597 return false;
598 598 }
599 599
600 600 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
601 601 julong v;
602 602 intx intx_v;
603 603 bool is_neg = false;
604 604 // Check the sign first since atomull() parses only unsigned values.
605 605 if (*value == '-') {
606 606 if (!CommandLineFlags::intxAt(name, &intx_v)) {
607 607 return false;
608 608 }
609 609 value++;
610 610 is_neg = true;
611 611 }
612 612 if (!atomull(value, &v)) {
613 613 return false;
614 614 }
615 615 intx_v = (intx) v;
616 616 if (is_neg) {
617 617 intx_v = -intx_v;
618 618 }
619 619 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
620 620 return true;
621 621 }
622 622 uintx uintx_v = (uintx) v;
623 623 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
624 624 return true;
625 625 }
626 626 uint64_t uint64_t_v = (uint64_t) v;
627 627 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
628 628 return true;
629 629 }
630 630 return false;
631 631 }
632 632
633 633 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
634 634 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
635 635 // Contract: CommandLineFlags always returns a pointer that needs freeing.
636 636 FREE_C_HEAP_ARRAY(char, value);
637 637 return true;
638 638 }
639 639
640 640 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
641 641 const char* old_value = "";
642 642 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
643 643 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
644 644 size_t new_len = strlen(new_value);
645 645 const char* value;
646 646 char* free_this_too = NULL;
647 647 if (old_len == 0) {
648 648 value = new_value;
649 649 } else if (new_len == 0) {
650 650 value = old_value;
651 651 } else {
652 652 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
653 653 // each new setting adds another LINE to the switch:
654 654 sprintf(buf, "%s\n%s", old_value, new_value);
655 655 value = buf;
656 656 free_this_too = buf;
657 657 }
658 658 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
659 659 // CommandLineFlags always returns a pointer that needs freeing.
660 660 FREE_C_HEAP_ARRAY(char, value);
661 661 if (free_this_too != NULL) {
662 662 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
663 663 FREE_C_HEAP_ARRAY(char, free_this_too);
664 664 }
665 665 return true;
666 666 }
667 667
668 668 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
669 669
670 670 // range of acceptable characters spelled out for portability reasons
671 671 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
672 672 #define BUFLEN 255
673 673 char name[BUFLEN+1];
674 674 char dummy;
675 675
676 676 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
677 677 return set_bool_flag(name, false, origin);
678 678 }
679 679 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
680 680 return set_bool_flag(name, true, origin);
681 681 }
682 682
683 683 char punct;
684 684 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
685 685 const char* value = strchr(arg, '=') + 1;
686 686 Flag* flag = Flag::find_flag(name, strlen(name));
687 687 if (flag != NULL && flag->is_ccstr()) {
688 688 if (flag->ccstr_accumulates()) {
689 689 return append_to_string_flag(name, value, origin);
690 690 } else {
691 691 if (value[0] == '\0') {
692 692 value = NULL;
693 693 }
694 694 return set_string_flag(name, value, origin);
695 695 }
696 696 }
697 697 }
698 698
699 699 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
700 700 const char* value = strchr(arg, '=') + 1;
701 701 // -XX:Foo:=xxx will reset the string flag to the given value.
702 702 if (value[0] == '\0') {
703 703 value = NULL;
704 704 }
705 705 return set_string_flag(name, value, origin);
706 706 }
707 707
708 708 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
709 709 #define SIGNED_NUMBER_RANGE "[-0123456789]"
710 710 #define NUMBER_RANGE "[0123456789]"
711 711 char value[BUFLEN + 1];
712 712 char value2[BUFLEN + 1];
713 713 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
714 714 // Looks like a floating-point number -- try again with more lenient format string
715 715 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
716 716 return set_fp_numeric_flag(name, value, origin);
717 717 }
718 718 }
719 719
720 720 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
721 721 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
722 722 return set_numeric_flag(name, value, origin);
723 723 }
724 724
725 725 return false;
726 726 }
727 727
728 728 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
729 729 assert(bldarray != NULL, "illegal argument");
730 730
731 731 if (arg == NULL) {
732 732 return;
733 733 }
734 734
735 735 int index = *count;
736 736
737 737 // expand the array and add arg to the last element
738 738 (*count)++;
739 739 if (*bldarray == NULL) {
740 740 *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
741 741 } else {
742 742 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
743 743 }
744 744 (*bldarray)[index] = strdup(arg);
745 745 }
746 746
747 747 void Arguments::build_jvm_args(const char* arg) {
748 748 add_string(&_jvm_args_array, &_num_jvm_args, arg);
749 749 }
750 750
751 751 void Arguments::build_jvm_flags(const char* arg) {
752 752 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
753 753 }
754 754
755 755 // utility function to return a string that concatenates all
756 756 // strings in a given char** array
757 757 const char* Arguments::build_resource_string(char** args, int count) {
758 758 if (args == NULL || count == 0) {
759 759 return NULL;
760 760 }
761 761 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
762 762 for (int i = 1; i < count; i++) {
763 763 length += strlen(args[i]) + 1; // add 1 for a space
764 764 }
765 765 char* s = NEW_RESOURCE_ARRAY(char, length);
766 766 strcpy(s, args[0]);
767 767 for (int j = 1; j < count; j++) {
768 768 strcat(s, " ");
769 769 strcat(s, args[j]);
770 770 }
771 771 return (const char*) s;
772 772 }
773 773
774 774 void Arguments::print_on(outputStream* st) {
775 775 st->print_cr("VM Arguments:");
776 776 if (num_jvm_flags() > 0) {
777 777 st->print("jvm_flags: "); print_jvm_flags_on(st);
778 778 }
779 779 if (num_jvm_args() > 0) {
780 780 st->print("jvm_args: "); print_jvm_args_on(st);
781 781 }
782 782 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
783 783 st->print_cr("Launcher Type: %s", _sun_java_launcher);
784 784 }
785 785
786 786 void Arguments::print_jvm_flags_on(outputStream* st) {
787 787 if (_num_jvm_flags > 0) {
788 788 for (int i=0; i < _num_jvm_flags; i++) {
789 789 st->print("%s ", _jvm_flags_array[i]);
790 790 }
791 791 st->print_cr("");
792 792 }
793 793 }
794 794
795 795 void Arguments::print_jvm_args_on(outputStream* st) {
796 796 if (_num_jvm_args > 0) {
797 797 for (int i=0; i < _num_jvm_args; i++) {
798 798 st->print("%s ", _jvm_args_array[i]);
799 799 }
800 800 st->print_cr("");
801 801 }
802 802 }
803 803
804 804 bool Arguments::process_argument(const char* arg,
805 805 jboolean ignore_unrecognized, FlagValueOrigin origin) {
806 806
807 807 JDK_Version since = JDK_Version();
808 808
809 809 if (parse_argument(arg, origin) || ignore_unrecognized) {
810 810 return true;
811 811 }
812 812
813 813 const char * const argname = *arg == '+' || *arg == '-' ? arg + 1 : arg;
814 814 if (is_newly_obsolete(arg, &since)) {
815 815 char version[256];
816 816 since.to_string(version, sizeof(version));
817 817 warning("ignoring option %s; support was removed in %s", argname, version);
818 818 return true;
819 819 }
820 820
821 821 jio_fprintf(defaultStream::error_stream(),
822 822 "Unrecognized VM option '%s'\n", argname);
823 823 // allow for commandline "commenting out" options like -XX:#+Verbose
824 824 return arg[0] == '#';
825 825 }
826 826
827 827 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
828 828 FILE* stream = fopen(file_name, "rb");
829 829 if (stream == NULL) {
830 830 if (should_exist) {
831 831 jio_fprintf(defaultStream::error_stream(),
832 832 "Could not open settings file %s\n", file_name);
833 833 return false;
834 834 } else {
835 835 return true;
836 836 }
837 837 }
838 838
839 839 char token[1024];
840 840 int pos = 0;
841 841
842 842 bool in_white_space = true;
843 843 bool in_comment = false;
844 844 bool in_quote = false;
845 845 char quote_c = 0;
846 846 bool result = true;
847 847
848 848 int c = getc(stream);
849 849 while(c != EOF) {
850 850 if (in_white_space) {
851 851 if (in_comment) {
852 852 if (c == '\n') in_comment = false;
853 853 } else {
854 854 if (c == '#') in_comment = true;
855 855 else if (!isspace(c)) {
856 856 in_white_space = false;
857 857 token[pos++] = c;
858 858 }
859 859 }
860 860 } else {
861 861 if (c == '\n' || (!in_quote && isspace(c))) {
862 862 // token ends at newline, or at unquoted whitespace
863 863 // this allows a way to include spaces in string-valued options
864 864 token[pos] = '\0';
865 865 logOption(token);
866 866 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
867 867 build_jvm_flags(token);
868 868 pos = 0;
869 869 in_white_space = true;
870 870 in_quote = false;
871 871 } else if (!in_quote && (c == '\'' || c == '"')) {
872 872 in_quote = true;
873 873 quote_c = c;
874 874 } else if (in_quote && (c == quote_c)) {
875 875 in_quote = false;
876 876 } else {
877 877 token[pos++] = c;
878 878 }
879 879 }
880 880 c = getc(stream);
881 881 }
882 882 if (pos > 0) {
883 883 token[pos] = '\0';
884 884 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
885 885 build_jvm_flags(token);
886 886 }
887 887 fclose(stream);
888 888 return result;
889 889 }
890 890
891 891 //=============================================================================================================
892 892 // Parsing of properties (-D)
893 893
894 894 const char* Arguments::get_property(const char* key) {
895 895 return PropertyList_get_value(system_properties(), key);
896 896 }
897 897
898 898 bool Arguments::add_property(const char* prop) {
899 899 const char* eq = strchr(prop, '=');
900 900 char* key;
901 901 // ns must be static--its address may be stored in a SystemProperty object.
902 902 const static char ns[1] = {0};
903 903 char* value = (char *)ns;
904 904
905 905 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
906 906 key = AllocateHeap(key_len + 1, "add_property");
907 907 strncpy(key, prop, key_len);
908 908 key[key_len] = '\0';
909 909
910 910 if (eq != NULL) {
911 911 size_t value_len = strlen(prop) - key_len - 1;
912 912 value = AllocateHeap(value_len + 1, "add_property");
913 913 strncpy(value, &prop[key_len + 1], value_len + 1);
914 914 }
915 915
916 916 if (strcmp(key, "java.compiler") == 0) {
917 917 process_java_compiler_argument(value);
918 918 FreeHeap(key);
919 919 if (eq != NULL) {
920 920 FreeHeap(value);
921 921 }
922 922 return true;
923 923 } else if (strcmp(key, "sun.java.command") == 0) {
924 924 _java_command = value;
925 925
926 926 // Record value in Arguments, but let it get passed to Java.
927 927 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
928 928 // launcher.pid property is private and is processed
929 929 // in process_sun_java_launcher_properties();
930 930 // the sun.java.launcher property is passed on to the java application
931 931 FreeHeap(key);
932 932 if (eq != NULL) {
933 933 FreeHeap(value);
934 934 }
935 935 return true;
936 936 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
937 937 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
938 938 // its value without going through the property list or making a Java call.
939 939 _java_vendor_url_bug = value;
940 940 } else if (strcmp(key, "sun.boot.library.path") == 0) {
941 941 PropertyList_unique_add(&_system_properties, key, value, true);
942 942 return true;
943 943 }
944 944 // Create new property and add at the end of the list
945 945 PropertyList_unique_add(&_system_properties, key, value);
946 946 return true;
947 947 }
948 948
949 949 //===========================================================================================================
950 950 // Setting int/mixed/comp mode flags
951 951
952 952 void Arguments::set_mode_flags(Mode mode) {
953 953 // Set up default values for all flags.
954 954 // If you add a flag to any of the branches below,
955 955 // add a default value for it here.
956 956 set_java_compiler(false);
957 957 _mode = mode;
958 958
959 959 // Ensure Agent_OnLoad has the correct initial values.
960 960 // This may not be the final mode; mode may change later in onload phase.
961 961 PropertyList_unique_add(&_system_properties, "java.vm.info",
962 962 (char*)VM_Version::vm_info_string(), false);
963 963
964 964 UseInterpreter = true;
965 965 UseCompiler = true;
966 966 UseLoopCounter = true;
967 967
968 968 #ifndef ZERO
969 969 // Turn these off for mixed and comp. Leave them on for Zero.
970 970 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
971 971 UseFastAccessorMethods = (mode == _int);
972 972 }
973 973 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
974 974 UseFastEmptyMethods = (mode == _int);
975 975 }
976 976 #endif
977 977
978 978 // Default values may be platform/compiler dependent -
979 979 // use the saved values
980 980 ClipInlining = Arguments::_ClipInlining;
981 981 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
982 982 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
983 983 BackgroundCompilation = Arguments::_BackgroundCompilation;
984 984
985 985 // Change from defaults based on mode
986 986 switch (mode) {
987 987 default:
988 988 ShouldNotReachHere();
989 989 break;
990 990 case _int:
991 991 UseCompiler = false;
992 992 UseLoopCounter = false;
993 993 AlwaysCompileLoopMethods = false;
994 994 UseOnStackReplacement = false;
995 995 break;
996 996 case _mixed:
997 997 // same as default
998 998 break;
999 999 case _comp:
1000 1000 UseInterpreter = false;
1001 1001 BackgroundCompilation = false;
1002 1002 ClipInlining = false;
1003 1003 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1004 1004 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1005 1005 // compile a level 4 (C2) and then continue executing it.
1006 1006 if (TieredCompilation) {
1007 1007 Tier3InvokeNotifyFreqLog = 0;
1008 1008 Tier4InvocationThreshold = 0;
1009 1009 }
1010 1010 break;
1011 1011 }
1012 1012 }
1013 1013
1014 1014 // Conflict: required to use shared spaces (-Xshare:on), but
1015 1015 // incompatible command line options were chosen.
1016 1016
1017 1017 static void no_shared_spaces() {
1018 1018 if (RequireSharedSpaces) {
1019 1019 jio_fprintf(defaultStream::error_stream(),
1020 1020 "Class data sharing is inconsistent with other specified options.\n");
1021 1021 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1022 1022 } else {
1023 1023 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1024 1024 }
1025 1025 }
1026 1026
1027 1027 void Arguments::set_tiered_flags() {
1028 1028 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1029 1029 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1030 1030 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1031 1031 }
1032 1032 if (CompilationPolicyChoice < 2) {
1033 1033 vm_exit_during_initialization(
1034 1034 "Incompatible compilation policy selected", NULL);
1035 1035 }
1036 1036 // Increase the code cache size - tiered compiles a lot more.
1037 1037 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1038 1038 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
1039 1039 }
1040 1040 }
1041 1041
1042 1042 #ifndef KERNEL
1043 1043 static void disable_adaptive_size_policy(const char* collector_name) {
1044 1044 if (UseAdaptiveSizePolicy) {
1045 1045 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1046 1046 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1047 1047 collector_name);
1048 1048 }
1049 1049 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1050 1050 }
1051 1051 }
1052 1052
1053 1053 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
1054 1054 // if it's not explictly set or unset. If the user has chosen
1055 1055 // UseParNewGC and not explicitly set ParallelGCThreads we
1056 1056 // set it, unless this is a single cpu machine.
1057 1057 void Arguments::set_parnew_gc_flags() {
1058 1058 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1059 1059 "control point invariant");
1060 1060 assert(UseParNewGC, "Error");
1061 1061
1062 1062 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1063 1063 disable_adaptive_size_policy("UseParNewGC");
1064 1064
1065 1065 if (ParallelGCThreads == 0) {
1066 1066 FLAG_SET_DEFAULT(ParallelGCThreads,
1067 1067 Abstract_VM_Version::parallel_worker_threads());
1068 1068 if (ParallelGCThreads == 1) {
1069 1069 FLAG_SET_DEFAULT(UseParNewGC, false);
1070 1070 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
1071 1071 }
1072 1072 }
1073 1073 if (UseParNewGC) {
1074 1074 // CDS doesn't work with ParNew yet
1075 1075 no_shared_spaces();
1076 1076
1077 1077 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1078 1078 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1079 1079 // we set them to 1024 and 1024.
1080 1080 // See CR 6362902.
1081 1081 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1082 1082 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1083 1083 }
1084 1084 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1085 1085 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1086 1086 }
1087 1087
1088 1088 // AlwaysTenure flag should make ParNew promote all at first collection.
1089 1089 // See CR 6362902.
1090 1090 if (AlwaysTenure) {
1091 1091 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
1092 1092 }
1093 1093 // When using compressed oops, we use local overflow stacks,
1094 1094 // rather than using a global overflow list chained through
1095 1095 // the klass word of the object's pre-image.
1096 1096 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1097 1097 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1098 1098 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1099 1099 }
1100 1100 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1101 1101 }
1102 1102 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1103 1103 }
1104 1104 }
1105 1105
1106 1106 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1107 1107 // sparc/solaris for certain applications, but would gain from
1108 1108 // further optimization and tuning efforts, and would almost
1109 1109 // certainly gain from analysis of platform and environment.
1110 1110 void Arguments::set_cms_and_parnew_gc_flags() {
1111 1111 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1112 1112 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1113 1113
1114 1114 // If we are using CMS, we prefer to UseParNewGC,
1115 1115 // unless explicitly forbidden.
1116 1116 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1117 1117 FLAG_SET_ERGO(bool, UseParNewGC, true);
1118 1118 }
1119 1119
1120 1120 // Turn off AdaptiveSizePolicy for CMS until it is complete.
1121 1121 disable_adaptive_size_policy("UseConcMarkSweepGC");
1122 1122
1123 1123 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1124 1124 // as needed.
1125 1125 if (UseParNewGC) {
1126 1126 set_parnew_gc_flags();
1127 1127 }
1128 1128
1129 1129 // MaxHeapSize is aligned down in collectorPolicy
1130 1130 size_t max_heap = align_size_down(MaxHeapSize,
1131 1131 CardTableRS::ct_max_alignment_constraint());
1132 1132
1133 1133 // Now make adjustments for CMS
1134 1134 intx tenuring_default = (intx)6;
1135 1135 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1136 1136
1137 1137 // Preferred young gen size for "short" pauses:
1138 1138 // upper bound depends on # of threads and NewRatio.
1139 1139 const uintx parallel_gc_threads =
1140 1140 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1141 1141 const size_t preferred_max_new_size_unaligned =
1142 1142 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1143 1143 size_t preferred_max_new_size =
1144 1144 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1145 1145
1146 1146 // Unless explicitly requested otherwise, size young gen
1147 1147 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1148 1148
1149 1149 // If either MaxNewSize or NewRatio is set on the command line,
1150 1150 // assume the user is trying to set the size of the young gen.
1151 1151 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1152 1152
1153 1153 // Set MaxNewSize to our calculated preferred_max_new_size unless
1154 1154 // NewSize was set on the command line and it is larger than
1155 1155 // preferred_max_new_size.
1156 1156 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1157 1157 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1158 1158 } else {
1159 1159 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1160 1160 }
1161 1161 if (PrintGCDetails && Verbose) {
1162 1162 // Too early to use gclog_or_tty
1163 1163 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1164 1164 }
1165 1165
1166 1166 // Code along this path potentially sets NewSize and OldSize
1167 1167
1168 1168 assert(max_heap >= InitialHeapSize, "Error");
1169 1169 assert(max_heap >= NewSize, "Error");
1170 1170
1171 1171 if (PrintGCDetails && Verbose) {
1172 1172 // Too early to use gclog_or_tty
1173 1173 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1174 1174 " initial_heap_size: " SIZE_FORMAT
1175 1175 " max_heap: " SIZE_FORMAT,
1176 1176 min_heap_size(), InitialHeapSize, max_heap);
1177 1177 }
1178 1178 size_t min_new = preferred_max_new_size;
1179 1179 if (FLAG_IS_CMDLINE(NewSize)) {
1180 1180 min_new = NewSize;
1181 1181 }
1182 1182 if (max_heap > min_new && min_heap_size() > min_new) {
1183 1183 // Unless explicitly requested otherwise, make young gen
1184 1184 // at least min_new, and at most preferred_max_new_size.
1185 1185 if (FLAG_IS_DEFAULT(NewSize)) {
1186 1186 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1187 1187 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1188 1188 if (PrintGCDetails && Verbose) {
1189 1189 // Too early to use gclog_or_tty
1190 1190 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1191 1191 }
1192 1192 }
1193 1193 // Unless explicitly requested otherwise, size old gen
1194 1194 // so it's NewRatio x of NewSize.
1195 1195 if (FLAG_IS_DEFAULT(OldSize)) {
1196 1196 if (max_heap > NewSize) {
1197 1197 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1198 1198 if (PrintGCDetails && Verbose) {
1199 1199 // Too early to use gclog_or_tty
1200 1200 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1201 1201 }
1202 1202 }
1203 1203 }
1204 1204 }
1205 1205 }
1206 1206 // Unless explicitly requested otherwise, definitely
1207 1207 // promote all objects surviving "tenuring_default" scavenges.
1208 1208 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1209 1209 FLAG_IS_DEFAULT(SurvivorRatio)) {
1210 1210 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1211 1211 }
1212 1212 // If we decided above (or user explicitly requested)
1213 1213 // `promote all' (via MaxTenuringThreshold := 0),
1214 1214 // prefer minuscule survivor spaces so as not to waste
1215 1215 // space for (non-existent) survivors
1216 1216 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1217 1217 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1218 1218 }
1219 1219 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1220 1220 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1221 1221 // This is done in order to make ParNew+CMS configuration to work
1222 1222 // with YoungPLABSize and OldPLABSize options.
1223 1223 // See CR 6362902.
1224 1224 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1225 1225 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1226 1226 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1227 1227 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1228 1228 // the value (either from the command line or ergonomics) of
1229 1229 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1230 1230 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1231 1231 } else {
1232 1232 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1233 1233 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1234 1234 // we'll let it to take precedence.
1235 1235 jio_fprintf(defaultStream::error_stream(),
1236 1236 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1237 1237 " options are specified for the CMS collector."
1238 1238 " CMSParPromoteBlocksToClaim will take precedence.\n");
1239 1239 }
1240 1240 }
1241 1241 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1242 1242 // OldPLAB sizing manually turned off: Use a larger default setting,
1243 1243 // unless it was manually specified. This is because a too-low value
1244 1244 // will slow down scavenges.
1245 1245 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1246 1246 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1247 1247 }
1248 1248 }
1249 1249 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1250 1250 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1251 1251 // If either of the static initialization defaults have changed, note this
1252 1252 // modification.
1253 1253 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1254 1254 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1255 1255 }
1256 1256 if (PrintGCDetails && Verbose) {
1257 1257 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1258 1258 MarkStackSize / K, MarkStackSizeMax / K);
1259 1259 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1260 1260 }
1261 1261 }
1262 1262 #endif // KERNEL
1263 1263
1264 1264 void set_object_alignment() {
1265 1265 // Object alignment.
1266 1266 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1267 1267 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1268 1268 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1269 1269 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1270 1270 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1271 1271 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1272 1272
1273 1273 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1274 1274 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1275 1275
1276 1276 // Oop encoding heap max
1277 1277 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1278 1278
1279 1279 #ifndef KERNEL
1280 1280 // Set CMS global values
1281 1281 CompactibleFreeListSpace::set_cms_values();
1282 1282 #endif // KERNEL
1283 1283 }
1284 1284
1285 1285 bool verify_object_alignment() {
1286 1286 // Object alignment.
1287 1287 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1288 1288 jio_fprintf(defaultStream::error_stream(),
1289 1289 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1290 1290 (int)ObjectAlignmentInBytes);
1291 1291 return false;
1292 1292 }
1293 1293 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1294 1294 jio_fprintf(defaultStream::error_stream(),
1295 1295 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1296 1296 (int)ObjectAlignmentInBytes, BytesPerLong);
1297 1297 return false;
1298 1298 }
1299 1299 // It does not make sense to have big object alignment
1300 1300 // since a space lost due to alignment will be greater
1301 1301 // then a saved space from compressed oops.
1302 1302 if ((int)ObjectAlignmentInBytes > 256) {
1303 1303 jio_fprintf(defaultStream::error_stream(),
1304 1304 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
1305 1305 (int)ObjectAlignmentInBytes);
1306 1306 return false;
1307 1307 }
1308 1308 // In case page size is very small.
1309 1309 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1310 1310 jio_fprintf(defaultStream::error_stream(),
1311 1311 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
1312 1312 (int)ObjectAlignmentInBytes, os::vm_page_size());
1313 1313 return false;
1314 1314 }
1315 1315 return true;
1316 1316 }
1317 1317
1318 1318 inline uintx max_heap_for_compressed_oops() {
1319 1319 // Avoid sign flip.
1320 1320 if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) {
1321 1321 return 0;
1322 1322 }
1323 1323 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1324 1324 NOT_LP64(ShouldNotReachHere(); return 0);
1325 1325 }
1326 1326
1327 1327 bool Arguments::should_auto_select_low_pause_collector() {
1328 1328 if (UseAutoGCSelectPolicy &&
1329 1329 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1330 1330 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1331 1331 if (PrintGCDetails) {
1332 1332 // Cannot use gclog_or_tty yet.
1333 1333 tty->print_cr("Automatic selection of the low pause collector"
1334 1334 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1335 1335 }
1336 1336 return true;
1337 1337 }
1338 1338 return false;
1339 1339 }
1340 1340
1341 1341 void Arguments::set_ergonomics_flags() {
1342 1342 // Parallel GC is not compatible with sharing. If one specifies
1343 1343 // that they want sharing explicitly, do not set ergonomics flags.
1344 1344 if (DumpSharedSpaces || RequireSharedSpaces) {
1345 1345 return;
1346 1346 }
1347 1347
1348 1348 if (os::is_server_class_machine() && !force_client_mode ) {
1349 1349 // If no other collector is requested explicitly,
1350 1350 // let the VM select the collector based on
1351 1351 // machine class and automatic selection policy.
1352 1352 if (!UseSerialGC &&
1353 1353 !UseConcMarkSweepGC &&
1354 1354 !UseG1GC &&
1355 1355 !UseParNewGC &&
1356 1356 !DumpSharedSpaces &&
1357 1357 FLAG_IS_DEFAULT(UseParallelGC)) {
1358 1358 if (should_auto_select_low_pause_collector()) {
1359 1359 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1360 1360 } else {
1361 1361 FLAG_SET_ERGO(bool, UseParallelGC, true);
1362 1362 }
1363 1363 no_shared_spaces();
1364 1364 }
1365 1365 }
1366 1366
1367 1367 #ifndef ZERO
1368 1368 #ifdef _LP64
1369 1369 // Check that UseCompressedOops can be set with the max heap size allocated
1370 1370 // by ergonomics.
1371 1371 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1372 1372 #if !defined(COMPILER1) || defined(TIERED)
1373 1373 // disable UseCompressedOops by default on MacOS X until 7118647 is fixed
1374 1374 #ifndef __APPLE__
1375 1375 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1376 1376 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1377 1377 }
1378 1378 #endif // !__APPLE__
1379 1379 #endif
1380 1380 #ifdef _WIN64
1381 1381 if (UseLargePages && UseCompressedOops) {
1382 1382 // Cannot allocate guard pages for implicit checks in indexed addressing
1383 1383 // mode, when large pages are specified on windows.
1384 1384 // This flag could be switched ON if narrow oop base address is set to 0,
1385 1385 // see code in Universe::initialize_heap().
1386 1386 Universe::set_narrow_oop_use_implicit_null_checks(false);
1387 1387 }
1388 1388 #endif // _WIN64
1389 1389 } else {
1390 1390 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1391 1391 warning("Max heap size too large for Compressed Oops");
1392 1392 FLAG_SET_DEFAULT(UseCompressedOops, false);
1393 1393 }
1394 1394 }
1395 1395 // Also checks that certain machines are slower with compressed oops
1396 1396 // in vm_version initialization code.
1397 1397 #endif // _LP64
1398 1398 #endif // !ZERO
1399 1399 }
1400 1400
1401 1401 void Arguments::set_parallel_gc_flags() {
1402 1402 assert(UseParallelGC || UseParallelOldGC, "Error");
1403 1403 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1404 1404 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1405 1405 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1406 1406 }
1407 1407 FLAG_SET_DEFAULT(UseParallelGC, true);
1408 1408
1409 1409 // If no heap maximum was requested explicitly, use some reasonable fraction
1410 1410 // of the physical memory, up to a maximum of 1GB.
1411 1411 if (UseParallelGC) {
1412 1412 FLAG_SET_DEFAULT(ParallelGCThreads,
1413 1413 Abstract_VM_Version::parallel_worker_threads());
1414 1414
1415 1415 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1416 1416 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1417 1417 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1418 1418 // See CR 6362902 for details.
1419 1419 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1420 1420 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1421 1421 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1422 1422 }
1423 1423 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1424 1424 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1425 1425 }
1426 1426 }
1427 1427
1428 1428 if (UseParallelOldGC) {
1429 1429 // Par compact uses lower default values since they are treated as
1430 1430 // minimums. These are different defaults because of the different
1431 1431 // interpretation and are not ergonomically set.
1432 1432 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1433 1433 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1434 1434 }
1435 1435 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1436 1436 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1437 1437 }
1438 1438 }
1439 1439 }
1440 1440 if (UseNUMA) {
1441 1441 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
1442 1442 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
1443 1443 }
1444 1444 // For those collectors or operating systems (eg, Windows) that do
1445 1445 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
1446 1446 UseNUMAInterleaving = true;
1447 1447 }
1448 1448 }
1449 1449
1450 1450 void Arguments::set_g1_gc_flags() {
1451 1451 assert(UseG1GC, "Error");
1452 1452 #ifdef COMPILER1
1453 1453 FastTLABRefill = false;
1454 1454 #endif
1455 1455 FLAG_SET_DEFAULT(ParallelGCThreads,
1456 1456 Abstract_VM_Version::parallel_worker_threads());
1457 1457 if (ParallelGCThreads == 0) {
1458 1458 FLAG_SET_DEFAULT(ParallelGCThreads,
1459 1459 Abstract_VM_Version::parallel_worker_threads());
1460 1460 }
1461 1461 no_shared_spaces();
1462 1462
1463 1463 if (FLAG_IS_DEFAULT(MarkStackSize)) {
1464 1464 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1465 1465 }
1466 1466 if (PrintGCDetails && Verbose) {
1467 1467 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1468 1468 MarkStackSize / K, MarkStackSizeMax / K);
1469 1469 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1470 1470 }
1471 1471
1472 1472 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1473 1473 // In G1, we want the default GC overhead goal to be higher than
1474 1474 // say in PS. So we set it here to 10%. Otherwise the heap might
1475 1475 // be expanded more aggressively than we would like it to. In
1476 1476 // fact, even 10% seems to not be high enough in some cases
1477 1477 // (especially small GC stress tests that the main thing they do
1478 1478 // is allocation). We might consider increase it further.
1479 1479 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1480 1480 }
1481 1481 }
1482 1482
1483 1483 void Arguments::set_heap_size() {
1484 1484 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1485 1485 // Deprecated flag
1486 1486 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1487 1487 }
1488 1488
1489 1489 const julong phys_mem =
1490 1490 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1491 1491 : (julong)MaxRAM;
1492 1492
1493 1493 // If the maximum heap size has not been set with -Xmx,
1494 1494 // then set it as fraction of the size of physical memory,
1495 1495 // respecting the maximum and minimum sizes of the heap.
1496 1496 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1497 1497 julong reasonable_max = phys_mem / MaxRAMFraction;
1498 1498
1499 1499 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1500 1500 // Small physical memory, so use a minimum fraction of it for the heap
1501 1501 reasonable_max = phys_mem / MinRAMFraction;
1502 1502 } else {
1503 1503 // Not-small physical memory, so require a heap at least
1504 1504 // as large as MaxHeapSize
1505 1505 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1506 1506 }
1507 1507 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1508 1508 // Limit the heap size to ErgoHeapSizeLimit
1509 1509 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1510 1510 }
1511 1511 if (UseCompressedOops) {
1512 1512 // Limit the heap size to the maximum possible when using compressed oops
1513 1513 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1514 1514 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1515 1515 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1516 1516 // but it should be not less than default MaxHeapSize.
1517 1517 max_coop_heap -= HeapBaseMinAddress;
1518 1518 }
1519 1519 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1520 1520 }
1521 1521 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1522 1522
1523 1523 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1524 1524 // An initial heap size was specified on the command line,
1525 1525 // so be sure that the maximum size is consistent. Done
1526 1526 // after call to allocatable_physical_memory because that
1527 1527 // method might reduce the allocation size.
1528 1528 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1529 1529 }
1530 1530
1531 1531 if (PrintGCDetails && Verbose) {
1532 1532 // Cannot use gclog_or_tty yet.
1533 1533 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1534 1534 }
1535 1535 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1536 1536 }
1537 1537
1538 1538 // If the initial_heap_size has not been set with InitialHeapSize
1539 1539 // or -Xms, then set it as fraction of the size of physical memory,
1540 1540 // respecting the maximum and minimum sizes of the heap.
1541 1541 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1542 1542 julong reasonable_minimum = (julong)(OldSize + NewSize);
1543 1543
1544 1544 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1545 1545
1546 1546 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1547 1547
1548 1548 julong reasonable_initial = phys_mem / InitialRAMFraction;
1549 1549
1550 1550 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1551 1551 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1552 1552
1553 1553 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1554 1554
1555 1555 if (PrintGCDetails && Verbose) {
1556 1556 // Cannot use gclog_or_tty yet.
1557 1557 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1558 1558 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1559 1559 }
1560 1560 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1561 1561 set_min_heap_size((uintx)reasonable_minimum);
1562 1562 }
1563 1563 }
1564 1564
1565 1565 // This must be called after ergonomics because we want bytecode rewriting
1566 1566 // if the server compiler is used, or if UseSharedSpaces is disabled.
1567 1567 void Arguments::set_bytecode_flags() {
1568 1568 // Better not attempt to store into a read-only space.
1569 1569 if (UseSharedSpaces) {
1570 1570 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1571 1571 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1572 1572 }
1573 1573
1574 1574 if (!RewriteBytecodes) {
1575 1575 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1576 1576 }
1577 1577 }
1578 1578
1579 1579 // Aggressive optimization flags -XX:+AggressiveOpts
1580 1580 void Arguments::set_aggressive_opts_flags() {
1581 1581 #ifdef COMPILER2
1582 1582 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1583 1583 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1584 1584 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1585 1585 }
1586 1586 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1587 1587 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1588 1588 }
1589 1589
1590 1590 // Feed the cache size setting into the JDK
1591 1591 char buffer[1024];
1592 1592 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1593 1593 add_property(buffer);
1594 1594 }
1595 1595 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1596 1596 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1597 1597 }
1598 1598 #endif
1599 1599
1600 1600 if (AggressiveOpts) {
1601 1601 // Sample flag setting code
1602 1602 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1603 1603 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1604 1604 // }
1605 1605 }
1606 1606 }
1607 1607
1608 1608 //===========================================================================================================
1609 1609 // Parsing of java.compiler property
1610 1610
1611 1611 void Arguments::process_java_compiler_argument(char* arg) {
1612 1612 // For backwards compatibility, Djava.compiler=NONE or ""
1613 1613 // causes us to switch to -Xint mode UNLESS -Xdebug
1614 1614 // is also specified.
1615 1615 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1616 1616 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1617 1617 }
1618 1618 }
1619 1619
1620 1620 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1621 1621 _sun_java_launcher = strdup(launcher);
1622 1622 if (strcmp("gamma", _sun_java_launcher) == 0) {
1623 1623 _created_by_gamma_launcher = true;
1624 1624 }
1625 1625 }
1626 1626
1627 1627 bool Arguments::created_by_java_launcher() {
1628 1628 assert(_sun_java_launcher != NULL, "property must have value");
1629 1629 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1630 1630 }
1631 1631
1632 1632 bool Arguments::created_by_gamma_launcher() {
1633 1633 return _created_by_gamma_launcher;
1634 1634 }
1635 1635
1636 1636 //===========================================================================================================
1637 1637 // Parsing of main arguments
1638 1638
1639 1639 bool Arguments::verify_interval(uintx val, uintx min,
1640 1640 uintx max, const char* name) {
1641 1641 // Returns true iff value is in the inclusive interval [min..max]
1642 1642 // false, otherwise.
1643 1643 if (val >= min && val <= max) {
1644 1644 return true;
1645 1645 }
1646 1646 jio_fprintf(defaultStream::error_stream(),
1647 1647 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1648 1648 " and " UINTX_FORMAT "\n",
1649 1649 name, val, min, max);
1650 1650 return false;
1651 1651 }
1652 1652
1653 1653 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1654 1654 // Returns true if given value is at least specified min threshold
1655 1655 // false, otherwise.
1656 1656 if (val >= min ) {
1657 1657 return true;
1658 1658 }
1659 1659 jio_fprintf(defaultStream::error_stream(),
1660 1660 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1661 1661 name, val, min);
1662 1662 return false;
1663 1663 }
1664 1664
1665 1665 bool Arguments::verify_percentage(uintx value, const char* name) {
1666 1666 if (value <= 100) {
1667 1667 return true;
1668 1668 }
1669 1669 jio_fprintf(defaultStream::error_stream(),
1670 1670 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1671 1671 name, value);
1672 1672 return false;
1673 1673 }
1674 1674
1675 1675 static void force_serial_gc() {
1676 1676 FLAG_SET_DEFAULT(UseSerialGC, true);
1677 1677 FLAG_SET_DEFAULT(UseParNewGC, false);
1678 1678 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1679 1679 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1680 1680 FLAG_SET_DEFAULT(UseParallelGC, false);
1681 1681 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1682 1682 FLAG_SET_DEFAULT(UseG1GC, false);
1683 1683 }
1684 1684
1685 1685 static bool verify_serial_gc_flags() {
1686 1686 return (UseSerialGC &&
1687 1687 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1688 1688 UseParallelGC || UseParallelOldGC));
1689 1689 }
1690 1690
1691 1691 // check if do gclog rotation
1692 1692 // +UseGCLogFileRotation is a must,
1693 1693 // no gc log rotation when log file not supplied or
1694 1694 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1695 1695 void check_gclog_consistency() {
1696 1696 if (UseGCLogFileRotation) {
1697 1697 if ((Arguments::gc_log_filename() == NULL) ||
1698 1698 (NumberOfGCLogFiles == 0) ||
1699 1699 (GCLogFileSize == 0)) {
1700 1700 jio_fprintf(defaultStream::output_stream(),
1701 1701 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1702 1702 "where num_of_file > 0 and num_of_size > 0\n"
1703 1703 "GC log rotation is turned off\n");
1704 1704 UseGCLogFileRotation = false;
1705 1705 }
1706 1706 }
1707 1707
1708 1708 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1709 1709 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1710 1710 jio_fprintf(defaultStream::output_stream(),
1711 1711 "GCLogFileSize changed to minimum 8K\n");
1712 1712 }
1713 1713 }
1714 1714
1715 1715 // Check consistency of GC selection
1716 1716 bool Arguments::check_gc_consistency() {
1717 1717 check_gclog_consistency();
1718 1718 bool status = true;
1719 1719 // Ensure that the user has not selected conflicting sets
1720 1720 // of collectors. [Note: this check is merely a user convenience;
1721 1721 // collectors over-ride each other so that only a non-conflicting
1722 1722 // set is selected; however what the user gets is not what they
1723 1723 // may have expected from the combination they asked for. It's
1724 1724 // better to reduce user confusion by not allowing them to
1725 1725 // select conflicting combinations.
1726 1726 uint i = 0;
1727 1727 if (UseSerialGC) i++;
1728 1728 if (UseConcMarkSweepGC || UseParNewGC) i++;
1729 1729 if (UseParallelGC || UseParallelOldGC) i++;
1730 1730 if (UseG1GC) i++;
1731 1731 if (i > 1) {
1732 1732 jio_fprintf(defaultStream::error_stream(),
1733 1733 "Conflicting collector combinations in option list; "
1734 1734 "please refer to the release notes for the combinations "
1735 1735 "allowed\n");
1736 1736 status = false;
1737 1737 }
1738 1738
1739 1739 return status;
1740 1740 }
1741 1741
1742 1742 // Check stack pages settings
1743 1743 bool Arguments::check_stack_pages()
1744 1744 {
1745 1745 bool status = true;
1746 1746 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1747 1747 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1748 1748 // greater stack shadow pages can't generate instruction to bang stack
1749 1749 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1750 1750 return status;
1751 1751 }
1752 1752
1753 1753 // Check the consistency of vm_init_args
1754 1754 bool Arguments::check_vm_args_consistency() {
1755 1755 // Method for adding checks for flag consistency.
1756 1756 // The intent is to warn the user of all possible conflicts,
1757 1757 // before returning an error.
1758 1758 // Note: Needs platform-dependent factoring.
1759 1759 bool status = true;
1760 1760
1761 1761 #if ( (defined(COMPILER2) && defined(SPARC)))
1762 1762 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1763 1763 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1764 1764 // x86. Normally, VM_Version_init must be called from init_globals in
1765 1765 // init.cpp, which is called by the initial java thread *after* arguments
1766 1766 // have been parsed. VM_Version_init gets called twice on sparc.
1767 1767 extern void VM_Version_init();
1768 1768 VM_Version_init();
1769 1769 if (!VM_Version::has_v9()) {
1770 1770 jio_fprintf(defaultStream::error_stream(),
1771 1771 "V8 Machine detected, Server requires V9\n");
1772 1772 status = false;
1773 1773 }
1774 1774 #endif /* COMPILER2 && SPARC */
1775 1775
1776 1776 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1777 1777 // builds so the cost of stack banging can be measured.
1778 1778 #if (defined(PRODUCT) && defined(SOLARIS))
1779 1779 if (!UseBoundThreads && !UseStackBanging) {
1780 1780 jio_fprintf(defaultStream::error_stream(),
1781 1781 "-UseStackBanging conflicts with -UseBoundThreads\n");
1782 1782
1783 1783 status = false;
1784 1784 }
1785 1785 #endif
1786 1786
1787 1787 if (TLABRefillWasteFraction == 0) {
1788 1788 jio_fprintf(defaultStream::error_stream(),
1789 1789 "TLABRefillWasteFraction should be a denominator, "
1790 1790 "not " SIZE_FORMAT "\n",
1791 1791 TLABRefillWasteFraction);
1792 1792 status = false;
1793 1793 }
1794 1794
1795 1795 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1796 1796 "AdaptiveSizePolicyWeight");
1797 1797 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1798 1798 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1799 1799 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1800 1800 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1801 1801
1802 1802 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1803 1803 jio_fprintf(defaultStream::error_stream(),
1804 1804 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1805 1805 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1806 1806 MinHeapFreeRatio, MaxHeapFreeRatio);
1807 1807 status = false;
1808 1808 }
1809 1809 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1810 1810 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1811 1811
1812 1812 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1813 1813 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1814 1814 }
1815 1815
1816 1816 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1817 1817 // Settings to encourage splitting.
1818 1818 if (!FLAG_IS_CMDLINE(NewRatio)) {
1819 1819 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1820 1820 }
1821 1821 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1822 1822 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1823 1823 }
1824 1824 }
1825 1825
1826 1826 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1827 1827 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1828 1828 if (GCTimeLimit == 100) {
1829 1829 // Turn off gc-overhead-limit-exceeded checks
1830 1830 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1831 1831 }
1832 1832
1833 1833 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1834 1834
1835 1835 status = status && check_gc_consistency();
1836 1836 status = status && check_stack_pages();
1837 1837
1838 1838 if (_has_alloc_profile) {
1839 1839 if (UseParallelGC || UseParallelOldGC) {
1840 1840 jio_fprintf(defaultStream::error_stream(),
1841 1841 "error: invalid argument combination.\n"
1842 1842 "Allocation profiling (-Xaprof) cannot be used together with "
1843 1843 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1844 1844 status = false;
1845 1845 }
1846 1846 if (UseConcMarkSweepGC) {
1847 1847 jio_fprintf(defaultStream::error_stream(),
1848 1848 "error: invalid argument combination.\n"
1849 1849 "Allocation profiling (-Xaprof) cannot be used together with "
1850 1850 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1851 1851 status = false;
1852 1852 }
1853 1853 }
1854 1854
1855 1855 if (CMSIncrementalMode) {
1856 1856 if (!UseConcMarkSweepGC) {
1857 1857 jio_fprintf(defaultStream::error_stream(),
1858 1858 "error: invalid argument combination.\n"
1859 1859 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1860 1860 "selected in order\nto use CMSIncrementalMode.\n");
1861 1861 status = false;
1862 1862 } else {
1863 1863 status = status && verify_percentage(CMSIncrementalDutyCycle,
1864 1864 "CMSIncrementalDutyCycle");
1865 1865 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1866 1866 "CMSIncrementalDutyCycleMin");
1867 1867 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1868 1868 "CMSIncrementalSafetyFactor");
1869 1869 status = status && verify_percentage(CMSIncrementalOffset,
1870 1870 "CMSIncrementalOffset");
1871 1871 status = status && verify_percentage(CMSExpAvgFactor,
1872 1872 "CMSExpAvgFactor");
1873 1873 // If it was not set on the command line, set
1874 1874 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1875 1875 if (CMSInitiatingOccupancyFraction < 0) {
1876 1876 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1877 1877 }
1878 1878 }
1879 1879 }
1880 1880
1881 1881 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1882 1882 // insists that we hold the requisite locks so that the iteration is
1883 1883 // MT-safe. For the verification at start-up and shut-down, we don't
1884 1884 // yet have a good way of acquiring and releasing these locks,
1885 1885 // which are not visible at the CollectedHeap level. We want to
1886 1886 // be able to acquire these locks and then do the iteration rather
1887 1887 // than just disable the lock verification. This will be fixed under
1888 1888 // bug 4788986.
1889 1889 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1890 1890 if (VerifyGCStartAt == 0) {
1891 1891 warning("Heap verification at start-up disabled "
1892 1892 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1893 1893 VerifyGCStartAt = 1; // Disable verification at start-up
1894 1894 }
1895 1895 if (VerifyBeforeExit) {
1896 1896 warning("Heap verification at shutdown disabled "
1897 1897 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1898 1898 VerifyBeforeExit = false; // Disable verification at shutdown
1899 1899 }
1900 1900 }
1901 1901
1902 1902 // Note: only executed in non-PRODUCT mode
1903 1903 if (!UseAsyncConcMarkSweepGC &&
1904 1904 (ExplicitGCInvokesConcurrent ||
1905 1905 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1906 1906 jio_fprintf(defaultStream::error_stream(),
1907 1907 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1908 1908 " with -UseAsyncConcMarkSweepGC");
1909 1909 status = false;
1910 1910 }
1911 1911
1912 1912 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
1913 1913
1914 1914 #ifndef SERIALGC
1915 1915 if (UseG1GC) {
1916 1916 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1917 1917 "InitiatingHeapOccupancyPercent");
1918 1918 status = status && verify_min_value(G1RefProcDrainInterval, 1,
1919 1919 "G1RefProcDrainInterval");
1920 1920 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
1921 1921 "G1ConcMarkStepDurationMillis");
1922 1922 }
1923 1923 #endif
1924 1924
1925 1925 status = status && verify_interval(RefDiscoveryPolicy,
1926 1926 ReferenceProcessor::DiscoveryPolicyMin,
1927 1927 ReferenceProcessor::DiscoveryPolicyMax,
1928 1928 "RefDiscoveryPolicy");
1929 1929
1930 1930 // Limit the lower bound of this flag to 1 as it is used in a division
1931 1931 // expression.
1932 1932 status = status && verify_interval(TLABWasteTargetPercent,
1933 1933 1, 100, "TLABWasteTargetPercent");
1934 1934
1935 1935 status = status && verify_object_alignment();
1936 1936
1937 1937 return status;
1938 1938 }
1939 1939
1940 1940 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1941 1941 const char* option_type) {
1942 1942 if (ignore) return false;
1943 1943
1944 1944 const char* spacer = " ";
1945 1945 if (option_type == NULL) {
1946 1946 option_type = ++spacer; // Set both to the empty string.
1947 1947 }
1948 1948
1949 1949 if (os::obsolete_option(option)) {
1950 1950 jio_fprintf(defaultStream::error_stream(),
1951 1951 "Obsolete %s%soption: %s\n", option_type, spacer,
1952 1952 option->optionString);
1953 1953 return false;
1954 1954 } else {
1955 1955 jio_fprintf(defaultStream::error_stream(),
1956 1956 "Unrecognized %s%soption: %s\n", option_type, spacer,
1957 1957 option->optionString);
1958 1958 return true;
1959 1959 }
1960 1960 }
1961 1961
1962 1962 static const char* user_assertion_options[] = {
1963 1963 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1964 1964 };
1965 1965
1966 1966 static const char* system_assertion_options[] = {
1967 1967 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1968 1968 };
1969 1969
1970 1970 // Return true if any of the strings in null-terminated array 'names' matches.
1971 1971 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1972 1972 // the option must match exactly.
1973 1973 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1974 1974 bool tail_allowed) {
1975 1975 for (/* empty */; *names != NULL; ++names) {
1976 1976 if (match_option(option, *names, tail)) {
1977 1977 if (**tail == '\0' || tail_allowed && **tail == ':') {
1978 1978 return true;
1979 1979 }
1980 1980 }
1981 1981 }
1982 1982 return false;
1983 1983 }
1984 1984
1985 1985 bool Arguments::parse_uintx(const char* value,
1986 1986 uintx* uintx_arg,
1987 1987 uintx min_size) {
1988 1988
1989 1989 // Check the sign first since atomull() parses only unsigned values.
1990 1990 bool value_is_positive = !(*value == '-');
1991 1991
1992 1992 if (value_is_positive) {
1993 1993 julong n;
1994 1994 bool good_return = atomull(value, &n);
1995 1995 if (good_return) {
1996 1996 bool above_minimum = n >= min_size;
1997 1997 bool value_is_too_large = n > max_uintx;
1998 1998
1999 1999 if (above_minimum && !value_is_too_large) {
2000 2000 *uintx_arg = n;
2001 2001 return true;
2002 2002 }
2003 2003 }
2004 2004 }
2005 2005 return false;
2006 2006 }
2007 2007
2008 2008 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2009 2009 julong* long_arg,
2010 2010 julong min_size) {
2011 2011 if (!atomull(s, long_arg)) return arg_unreadable;
2012 2012 return check_memory_size(*long_arg, min_size);
2013 2013 }
2014 2014
2015 2015 // Parse JavaVMInitArgs structure
2016 2016
2017 2017 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2018 2018 // For components of the system classpath.
2019 2019 SysClassPath scp(Arguments::get_sysclasspath());
2020 2020 bool scp_assembly_required = false;
2021 2021
2022 2022 // Save default settings for some mode flags
2023 2023 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2024 2024 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2025 2025 Arguments::_ClipInlining = ClipInlining;
2026 2026 Arguments::_BackgroundCompilation = BackgroundCompilation;
2027 2027
2028 2028 // Setup flags for mixed which is the default
2029 2029 set_mode_flags(_mixed);
2030 2030
2031 2031 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2032 2032 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2033 2033 if (result != JNI_OK) {
2034 2034 return result;
2035 2035 }
2036 2036
2037 2037 // Parse JavaVMInitArgs structure passed in
2038 2038 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2039 2039 if (result != JNI_OK) {
2040 2040 return result;
2041 2041 }
2042 2042
2043 2043 if (AggressiveOpts) {
2044 2044 // Insert alt-rt.jar between user-specified bootclasspath
2045 2045 // prefix and the default bootclasspath. os::set_boot_path()
2046 2046 // uses meta_index_dir as the default bootclasspath directory.
2047 2047 const char* altclasses_jar = "alt-rt.jar";
2048 2048 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2049 2049 strlen(altclasses_jar);
2050 2050 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
2051 2051 strcpy(altclasses_path, get_meta_index_dir());
2052 2052 strcat(altclasses_path, altclasses_jar);
2053 2053 scp.add_suffix_to_prefix(altclasses_path);
2054 2054 scp_assembly_required = true;
2055 2055 FREE_C_HEAP_ARRAY(char, altclasses_path);
2056 2056 }
2057 2057
2058 2058 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2059 2059 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2060 2060 if (result != JNI_OK) {
2061 2061 return result;
2062 2062 }
2063 2063
2064 2064 // Do final processing now that all arguments have been parsed
2065 2065 result = finalize_vm_init_args(&scp, scp_assembly_required);
2066 2066 if (result != JNI_OK) {
2067 2067 return result;
2068 2068 }
2069 2069
2070 2070 return JNI_OK;
2071 2071 }
2072 2072
2073 2073 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2074 2074 SysClassPath* scp_p,
2075 2075 bool* scp_assembly_required_p,
2076 2076 FlagValueOrigin origin) {
2077 2077 // Remaining part of option string
2078 2078 const char* tail;
2079 2079
2080 2080 // iterate over arguments
2081 2081 for (int index = 0; index < args->nOptions; index++) {
2082 2082 bool is_absolute_path = false; // for -agentpath vs -agentlib
2083 2083
2084 2084 const JavaVMOption* option = args->options + index;
2085 2085
2086 2086 if (!match_option(option, "-Djava.class.path", &tail) &&
2087 2087 !match_option(option, "-Dsun.java.command", &tail) &&
2088 2088 !match_option(option, "-Dsun.java.launcher", &tail)) {
2089 2089
2090 2090 // add all jvm options to the jvm_args string. This string
2091 2091 // is used later to set the java.vm.args PerfData string constant.
2092 2092 // the -Djava.class.path and the -Dsun.java.command options are
2093 2093 // omitted from jvm_args string as each have their own PerfData
2094 2094 // string constant object.
2095 2095 build_jvm_args(option->optionString);
2096 2096 }
2097 2097
2098 2098 // -verbose:[class/gc/jni]
2099 2099 if (match_option(option, "-verbose", &tail)) {
2100 2100 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2101 2101 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2102 2102 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2103 2103 } else if (!strcmp(tail, ":gc")) {
2104 2104 FLAG_SET_CMDLINE(bool, PrintGC, true);
2105 2105 } else if (!strcmp(tail, ":jni")) {
2106 2106 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2107 2107 }
2108 2108 // -da / -ea / -disableassertions / -enableassertions
2109 2109 // These accept an optional class/package name separated by a colon, e.g.,
2110 2110 // -da:java.lang.Thread.
2111 2111 } else if (match_option(option, user_assertion_options, &tail, true)) {
2112 2112 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2113 2113 if (*tail == '\0') {
2114 2114 JavaAssertions::setUserClassDefault(enable);
2115 2115 } else {
2116 2116 assert(*tail == ':', "bogus match by match_option()");
2117 2117 JavaAssertions::addOption(tail + 1, enable);
2118 2118 }
2119 2119 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2120 2120 } else if (match_option(option, system_assertion_options, &tail, false)) {
2121 2121 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2122 2122 JavaAssertions::setSystemClassDefault(enable);
2123 2123 // -bootclasspath:
2124 2124 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2125 2125 scp_p->reset_path(tail);
2126 2126 *scp_assembly_required_p = true;
2127 2127 // -bootclasspath/a:
2128 2128 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2129 2129 scp_p->add_suffix(tail);
2130 2130 *scp_assembly_required_p = true;
2131 2131 // -bootclasspath/p:
2132 2132 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2133 2133 scp_p->add_prefix(tail);
2134 2134 *scp_assembly_required_p = true;
2135 2135 // -Xrun
2136 2136 } else if (match_option(option, "-Xrun", &tail)) {
2137 2137 if (tail != NULL) {
2138 2138 const char* pos = strchr(tail, ':');
2139 2139 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2140 2140 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2141 2141 name[len] = '\0';
2142 2142
2143 2143 char *options = NULL;
2144 2144 if(pos != NULL) {
2145 2145 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2146 2146 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
2147 2147 }
2148 2148 #ifdef JVMTI_KERNEL
2149 2149 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2150 2150 warning("profiling and debugging agents are not supported with Kernel VM");
2151 2151 } else
2152 2152 #endif // JVMTI_KERNEL
2153 2153 add_init_library(name, options);
2154 2154 }
2155 2155 // -agentlib and -agentpath
2156 2156 } else if (match_option(option, "-agentlib:", &tail) ||
2157 2157 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2158 2158 if(tail != NULL) {
2159 2159 const char* pos = strchr(tail, '=');
2160 2160 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2161 2161 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2162 2162 name[len] = '\0';
2163 2163
2164 2164 char *options = NULL;
2165 2165 if(pos != NULL) {
2166 2166 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
2167 2167 }
2168 2168 #ifdef JVMTI_KERNEL
2169 2169 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2170 2170 warning("profiling and debugging agents are not supported with Kernel VM");
2171 2171 } else
2172 2172 #endif // JVMTI_KERNEL
2173 2173 add_init_agent(name, options, is_absolute_path);
2174 2174
2175 2175 }
2176 2176 // -javaagent
2177 2177 } else if (match_option(option, "-javaagent:", &tail)) {
2178 2178 if(tail != NULL) {
2179 2179 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
2180 2180 add_init_agent("instrument", options, false);
2181 2181 }
2182 2182 // -Xnoclassgc
2183 2183 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2184 2184 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2185 2185 // -Xincgc: i-CMS
2186 2186 } else if (match_option(option, "-Xincgc", &tail)) {
2187 2187 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2188 2188 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2189 2189 // -Xnoincgc: no i-CMS
2190 2190 } else if (match_option(option, "-Xnoincgc", &tail)) {
2191 2191 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2192 2192 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2193 2193 // -Xconcgc
2194 2194 } else if (match_option(option, "-Xconcgc", &tail)) {
2195 2195 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2196 2196 // -Xnoconcgc
2197 2197 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2198 2198 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2199 2199 // -Xbatch
2200 2200 } else if (match_option(option, "-Xbatch", &tail)) {
2201 2201 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2202 2202 // -Xmn for compatibility with other JVM vendors
2203 2203 } else if (match_option(option, "-Xmn", &tail)) {
2204 2204 julong long_initial_eden_size = 0;
2205 2205 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2206 2206 if (errcode != arg_in_range) {
2207 2207 jio_fprintf(defaultStream::error_stream(),
2208 2208 "Invalid initial eden size: %s\n", option->optionString);
2209 2209 describe_range_error(errcode);
2210 2210 return JNI_EINVAL;
2211 2211 }
2212 2212 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2213 2213 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2214 2214 // -Xms
2215 2215 } else if (match_option(option, "-Xms", &tail)) {
2216 2216 julong long_initial_heap_size = 0;
2217 2217 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2218 2218 if (errcode != arg_in_range) {
2219 2219 jio_fprintf(defaultStream::error_stream(),
2220 2220 "Invalid initial heap size: %s\n", option->optionString);
2221 2221 describe_range_error(errcode);
2222 2222 return JNI_EINVAL;
2223 2223 }
2224 2224 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2225 2225 // Currently the minimum size and the initial heap sizes are the same.
2226 2226 set_min_heap_size(InitialHeapSize);
2227 2227 // -Xmx
2228 2228 } else if (match_option(option, "-Xmx", &tail)) {
2229 2229 julong long_max_heap_size = 0;
2230 2230 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2231 2231 if (errcode != arg_in_range) {
2232 2232 jio_fprintf(defaultStream::error_stream(),
2233 2233 "Invalid maximum heap size: %s\n", option->optionString);
2234 2234 describe_range_error(errcode);
2235 2235 return JNI_EINVAL;
2236 2236 }
2237 2237 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2238 2238 // Xmaxf
2239 2239 } else if (match_option(option, "-Xmaxf", &tail)) {
2240 2240 int maxf = (int)(atof(tail) * 100);
2241 2241 if (maxf < 0 || maxf > 100) {
2242 2242 jio_fprintf(defaultStream::error_stream(),
2243 2243 "Bad max heap free percentage size: %s\n",
2244 2244 option->optionString);
2245 2245 return JNI_EINVAL;
2246 2246 } else {
2247 2247 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2248 2248 }
2249 2249 // Xminf
2250 2250 } else if (match_option(option, "-Xminf", &tail)) {
2251 2251 int minf = (int)(atof(tail) * 100);
2252 2252 if (minf < 0 || minf > 100) {
2253 2253 jio_fprintf(defaultStream::error_stream(),
2254 2254 "Bad min heap free percentage size: %s\n",
2255 2255 option->optionString);
2256 2256 return JNI_EINVAL;
2257 2257 } else {
2258 2258 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2259 2259 }
2260 2260 // -Xss
2261 2261 } else if (match_option(option, "-Xss", &tail)) {
2262 2262 julong long_ThreadStackSize = 0;
2263 2263 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2264 2264 if (errcode != arg_in_range) {
2265 2265 jio_fprintf(defaultStream::error_stream(),
2266 2266 "Invalid thread stack size: %s\n", option->optionString);
2267 2267 describe_range_error(errcode);
2268 2268 return JNI_EINVAL;
2269 2269 }
2270 2270 // Internally track ThreadStackSize in units of 1024 bytes.
2271 2271 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2272 2272 round_to((int)long_ThreadStackSize, K) / K);
2273 2273 // -Xoss
2274 2274 } else if (match_option(option, "-Xoss", &tail)) {
2275 2275 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2276 2276 // -Xmaxjitcodesize
2277 2277 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2278 2278 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2279 2279 julong long_ReservedCodeCacheSize = 0;
2280 2280 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2281 2281 (size_t)InitialCodeCacheSize);
2282 2282 if (errcode != arg_in_range) {
2283 2283 jio_fprintf(defaultStream::error_stream(),
2284 2284 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2285 2285 option->optionString, InitialCodeCacheSize/K);
2286 2286 describe_range_error(errcode);
2287 2287 return JNI_EINVAL;
2288 2288 }
2289 2289 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2290 2290 // -green
2291 2291 } else if (match_option(option, "-green", &tail)) {
2292 2292 jio_fprintf(defaultStream::error_stream(),
2293 2293 "Green threads support not available\n");
2294 2294 return JNI_EINVAL;
2295 2295 // -native
2296 2296 } else if (match_option(option, "-native", &tail)) {
2297 2297 // HotSpot always uses native threads, ignore silently for compatibility
2298 2298 // -Xsqnopause
2299 2299 } else if (match_option(option, "-Xsqnopause", &tail)) {
2300 2300 // EVM option, ignore silently for compatibility
2301 2301 // -Xrs
2302 2302 } else if (match_option(option, "-Xrs", &tail)) {
2303 2303 // Classic/EVM option, new functionality
2304 2304 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2305 2305 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2306 2306 // change default internal VM signals used - lower case for back compat
2307 2307 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2308 2308 // -Xoptimize
2309 2309 } else if (match_option(option, "-Xoptimize", &tail)) {
2310 2310 // EVM option, ignore silently for compatibility
2311 2311 // -Xprof
2312 2312 } else if (match_option(option, "-Xprof", &tail)) {
2313 2313 #ifndef FPROF_KERNEL
2314 2314 _has_profile = true;
2315 2315 #else // FPROF_KERNEL
2316 2316 // do we have to exit?
2317 2317 warning("Kernel VM does not support flat profiling.");
2318 2318 #endif // FPROF_KERNEL
2319 2319 // -Xaprof
2320 2320 } else if (match_option(option, "-Xaprof", &tail)) {
2321 2321 _has_alloc_profile = true;
2322 2322 // -Xconcurrentio
2323 2323 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2324 2324 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2325 2325 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2326 2326 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2327 2327 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2328 2328 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2329 2329
2330 2330 // -Xinternalversion
2331 2331 } else if (match_option(option, "-Xinternalversion", &tail)) {
2332 2332 jio_fprintf(defaultStream::output_stream(), "%s\n",
2333 2333 VM_Version::internal_vm_info_string());
2334 2334 vm_exit(0);
2335 2335 #ifndef PRODUCT
2336 2336 // -Xprintflags
2337 2337 } else if (match_option(option, "-Xprintflags", &tail)) {
2338 2338 CommandLineFlags::printFlags(tty, false);
2339 2339 vm_exit(0);
2340 2340 #endif
2341 2341 // -D
2342 2342 } else if (match_option(option, "-D", &tail)) {
2343 2343 if (!add_property(tail)) {
2344 2344 return JNI_ENOMEM;
2345 2345 }
2346 2346 // Out of the box management support
2347 2347 if (match_option(option, "-Dcom.sun.management", &tail)) {
2348 2348 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2349 2349 }
2350 2350 // -Xint
2351 2351 } else if (match_option(option, "-Xint", &tail)) {
2352 2352 set_mode_flags(_int);
2353 2353 // -Xmixed
2354 2354 } else if (match_option(option, "-Xmixed", &tail)) {
2355 2355 set_mode_flags(_mixed);
2356 2356 // -Xcomp
2357 2357 } else if (match_option(option, "-Xcomp", &tail)) {
2358 2358 // for testing the compiler; turn off all flags that inhibit compilation
2359 2359 set_mode_flags(_comp);
2360 2360
2361 2361 // -Xshare:dump
2362 2362 } else if (match_option(option, "-Xshare:dump", &tail)) {
2363 2363 #ifdef TIERED
2364 2364 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2365 2365 set_mode_flags(_int); // Prevent compilation, which creates objects
2366 2366 #elif defined(COMPILER2)
2367 2367 vm_exit_during_initialization(
2368 2368 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2369 2369 #elif defined(KERNEL)
2370 2370 vm_exit_during_initialization(
2371 2371 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2372 2372 #else
2373 2373 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2374 2374 set_mode_flags(_int); // Prevent compilation, which creates objects
2375 2375 #endif
2376 2376 // -Xshare:on
2377 2377 } else if (match_option(option, "-Xshare:on", &tail)) {
2378 2378 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2379 2379 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2380 2380 // -Xshare:auto
2381 2381 } else if (match_option(option, "-Xshare:auto", &tail)) {
2382 2382 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2383 2383 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2384 2384 // -Xshare:off
2385 2385 } else if (match_option(option, "-Xshare:off", &tail)) {
2386 2386 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2387 2387 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2388 2388
2389 2389 // -Xverify
2390 2390 } else if (match_option(option, "-Xverify", &tail)) {
2391 2391 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2392 2392 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2393 2393 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2394 2394 } else if (strcmp(tail, ":remote") == 0) {
2395 2395 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2396 2396 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2397 2397 } else if (strcmp(tail, ":none") == 0) {
2398 2398 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2399 2399 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2400 2400 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2401 2401 return JNI_EINVAL;
2402 2402 }
2403 2403 // -Xdebug
2404 2404 } else if (match_option(option, "-Xdebug", &tail)) {
2405 2405 // note this flag has been used, then ignore
2406 2406 set_xdebug_mode(true);
2407 2407 // -Xnoagent
2408 2408 } else if (match_option(option, "-Xnoagent", &tail)) {
2409 2409 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2410 2410 } else if (match_option(option, "-Xboundthreads", &tail)) {
2411 2411 // Bind user level threads to kernel threads (Solaris only)
2412 2412 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2413 2413 } else if (match_option(option, "-Xloggc:", &tail)) {
2414 2414 // Redirect GC output to the file. -Xloggc:<filename>
2415 2415 // ostream_init_log(), when called will use this filename
2416 2416 // to initialize a fileStream.
2417 2417 _gc_log_filename = strdup(tail);
2418 2418 FLAG_SET_CMDLINE(bool, PrintGC, true);
2419 2419 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2420 2420
2421 2421 // JNI hooks
2422 2422 } else if (match_option(option, "-Xcheck", &tail)) {
2423 2423 if (!strcmp(tail, ":jni")) {
2424 2424 CheckJNICalls = true;
2425 2425 } else if (is_bad_option(option, args->ignoreUnrecognized,
2426 2426 "check")) {
2427 2427 return JNI_EINVAL;
2428 2428 }
2429 2429 } else if (match_option(option, "vfprintf", &tail)) {
2430 2430 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2431 2431 } else if (match_option(option, "exit", &tail)) {
2432 2432 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2433 2433 } else if (match_option(option, "abort", &tail)) {
2434 2434 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2435 2435 // -XX:+AggressiveHeap
2436 2436 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2437 2437
2438 2438 // This option inspects the machine and attempts to set various
2439 2439 // parameters to be optimal for long-running, memory allocation
2440 2440 // intensive jobs. It is intended for machines with large
2441 2441 // amounts of cpu and memory.
2442 2442
2443 2443 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2444 2444 // VM, but we may not be able to represent the total physical memory
2445 2445 // available (like having 8gb of memory on a box but using a 32bit VM).
2446 2446 // Thus, we need to make sure we're using a julong for intermediate
2447 2447 // calculations.
2448 2448 julong initHeapSize;
2449 2449 julong total_memory = os::physical_memory();
2450 2450
2451 2451 if (total_memory < (julong)256*M) {
2452 2452 jio_fprintf(defaultStream::error_stream(),
2453 2453 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2454 2454 vm_exit(1);
2455 2455 }
2456 2456
2457 2457 // The heap size is half of available memory, or (at most)
2458 2458 // all of possible memory less 160mb (leaving room for the OS
2459 2459 // when using ISM). This is the maximum; because adaptive sizing
2460 2460 // is turned on below, the actual space used may be smaller.
2461 2461
2462 2462 initHeapSize = MIN2(total_memory / (julong)2,
2463 2463 total_memory - (julong)160*M);
2464 2464
2465 2465 // Make sure that if we have a lot of memory we cap the 32 bit
2466 2466 // process space. The 64bit VM version of this function is a nop.
2467 2467 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2468 2468
2469 2469 // The perm gen is separate but contiguous with the
2470 2470 // object heap (and is reserved with it) so subtract it
2471 2471 // from the heap size.
2472 2472 if (initHeapSize > MaxPermSize) {
2473 2473 initHeapSize = initHeapSize - MaxPermSize;
2474 2474 } else {
2475 2475 warning("AggressiveHeap and MaxPermSize values may conflict");
2476 2476 }
2477 2477
2478 2478 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2479 2479 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2480 2480 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2481 2481 // Currently the minimum size and the initial heap sizes are the same.
2482 2482 set_min_heap_size(initHeapSize);
2483 2483 }
2484 2484 if (FLAG_IS_DEFAULT(NewSize)) {
2485 2485 // Make the young generation 3/8ths of the total heap.
2486 2486 FLAG_SET_CMDLINE(uintx, NewSize,
2487 2487 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2488 2488 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2489 2489 }
2490 2490
2491 2491 FLAG_SET_DEFAULT(UseLargePages, true);
2492 2492
2493 2493 // Increase some data structure sizes for efficiency
2494 2494 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2495 2495 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2496 2496 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2497 2497
2498 2498 // See the OldPLABSize comment below, but replace 'after promotion'
2499 2499 // with 'after copying'. YoungPLABSize is the size of the survivor
2500 2500 // space per-gc-thread buffers. The default is 4kw.
2501 2501 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2502 2502
2503 2503 // OldPLABSize is the size of the buffers in the old gen that
2504 2504 // UseParallelGC uses to promote live data that doesn't fit in the
2505 2505 // survivor spaces. At any given time, there's one for each gc thread.
2506 2506 // The default size is 1kw. These buffers are rarely used, since the
2507 2507 // survivor spaces are usually big enough. For specjbb, however, there
2508 2508 // are occasions when there's lots of live data in the young gen
2509 2509 // and we end up promoting some of it. We don't have a definite
2510 2510 // explanation for why bumping OldPLABSize helps, but the theory
2511 2511 // is that a bigger PLAB results in retaining something like the
2512 2512 // original allocation order after promotion, which improves mutator
2513 2513 // locality. A minor effect may be that larger PLABs reduce the
2514 2514 // number of PLAB allocation events during gc. The value of 8kw
2515 2515 // was arrived at by experimenting with specjbb.
2516 2516 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2517 2517
2518 2518 // CompilationPolicyChoice=0 causes the server compiler to adopt
2519 2519 // a more conservative which-method-do-I-compile policy when one
2520 2520 // of the counters maintained by the interpreter trips. The
2521 2521 // result is reduced startup time and improved specjbb and
2522 2522 // alacrity performance. Zero is the default, but we set it
2523 2523 // explicitly here in case the default changes.
2524 2524 // See runtime/compilationPolicy.*.
2525 2525 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2526 2526
2527 2527 // Enable parallel GC and adaptive generation sizing
2528 2528 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2529 2529 FLAG_SET_DEFAULT(ParallelGCThreads,
2530 2530 Abstract_VM_Version::parallel_worker_threads());
2531 2531
2532 2532 // Encourage steady state memory management
2533 2533 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2534 2534
2535 2535 // This appears to improve mutator locality
2536 2536 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2537 2537
2538 2538 // Get around early Solaris scheduling bug
2539 2539 // (affinity vs other jobs on system)
2540 2540 // but disallow DR and offlining (5008695).
2541 2541 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2542 2542
2543 2543 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2544 2544 // The last option must always win.
2545 2545 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2546 2546 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2547 2547 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2548 2548 // The last option must always win.
2549 2549 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2550 2550 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2551 2551 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2552 2552 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2553 2553 jio_fprintf(defaultStream::error_stream(),
2554 2554 "Please use CMSClassUnloadingEnabled in place of "
2555 2555 "CMSPermGenSweepingEnabled in the future\n");
2556 2556 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2557 2557 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2558 2558 jio_fprintf(defaultStream::error_stream(),
2559 2559 "Please use -XX:+UseGCOverheadLimit in place of "
2560 2560 "-XX:+UseGCTimeLimit in the future\n");
2561 2561 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2562 2562 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2563 2563 jio_fprintf(defaultStream::error_stream(),
2564 2564 "Please use -XX:-UseGCOverheadLimit in place of "
2565 2565 "-XX:-UseGCTimeLimit in the future\n");
2566 2566 // The TLE options are for compatibility with 1.3 and will be
2567 2567 // removed without notice in a future release. These options
2568 2568 // are not to be documented.
2569 2569 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2570 2570 // No longer used.
2571 2571 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2572 2572 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2573 2573 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2574 2574 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2575 2575 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2576 2576 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2577 2577 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2578 2578 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2579 2579 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2580 2580 // No longer used.
2581 2581 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2582 2582 julong long_tlab_size = 0;
2583 2583 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2584 2584 if (errcode != arg_in_range) {
2585 2585 jio_fprintf(defaultStream::error_stream(),
2586 2586 "Invalid TLAB size: %s\n", option->optionString);
2587 2587 describe_range_error(errcode);
2588 2588 return JNI_EINVAL;
2589 2589 }
2590 2590 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2591 2591 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2592 2592 // No longer used.
2593 2593 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2594 2594 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2595 2595 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2596 2596 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2597 2597 SOLARIS_ONLY(
2598 2598 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2599 2599 warning("-XX:+UsePermISM is obsolete.");
2600 2600 FLAG_SET_CMDLINE(bool, UseISM, true);
2601 2601 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2602 2602 FLAG_SET_CMDLINE(bool, UseISM, false);
2603 2603 )
2604 2604 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2605 2605 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2606 2606 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2607 2607 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2608 2608 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2609 2609 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2610 2610 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2611 2611 #if defined(DTRACE_ENABLED)
2612 2612 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2613 2613 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2614 2614 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2615 2615 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2616 2616 #else // defined(DTRACE_ENABLED)
2617 2617 jio_fprintf(defaultStream::error_stream(),
2618 2618 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2619 2619 return JNI_EINVAL;
2620 2620 #endif // defined(DTRACE_ENABLED)
2621 2621 #ifdef ASSERT
2622 2622 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2623 2623 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2624 2624 // disable scavenge before parallel mark-compact
2625 2625 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2626 2626 #endif
2627 2627 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2628 2628 julong cms_blocks_to_claim = (julong)atol(tail);
2629 2629 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2630 2630 jio_fprintf(defaultStream::error_stream(),
2631 2631 "Please use -XX:OldPLABSize in place of "
2632 2632 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2633 2633 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2634 2634 julong cms_blocks_to_claim = (julong)atol(tail);
2635 2635 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2636 2636 jio_fprintf(defaultStream::error_stream(),
2637 2637 "Please use -XX:OldPLABSize in place of "
2638 2638 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2639 2639 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2640 2640 julong old_plab_size = 0;
2641 2641 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2642 2642 if (errcode != arg_in_range) {
2643 2643 jio_fprintf(defaultStream::error_stream(),
2644 2644 "Invalid old PLAB size: %s\n", option->optionString);
2645 2645 describe_range_error(errcode);
2646 2646 return JNI_EINVAL;
2647 2647 }
2648 2648 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2649 2649 jio_fprintf(defaultStream::error_stream(),
2650 2650 "Please use -XX:OldPLABSize in place of "
2651 2651 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2652 2652 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2653 2653 julong young_plab_size = 0;
2654 2654 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2655 2655 if (errcode != arg_in_range) {
2656 2656 jio_fprintf(defaultStream::error_stream(),
2657 2657 "Invalid young PLAB size: %s\n", option->optionString);
2658 2658 describe_range_error(errcode);
2659 2659 return JNI_EINVAL;
2660 2660 }
2661 2661 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2662 2662 jio_fprintf(defaultStream::error_stream(),
2663 2663 "Please use -XX:YoungPLABSize in place of "
2664 2664 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2665 2665 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2666 2666 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2667 2667 julong stack_size = 0;
2668 2668 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2669 2669 if (errcode != arg_in_range) {
2670 2670 jio_fprintf(defaultStream::error_stream(),
2671 2671 "Invalid mark stack size: %s\n", option->optionString);
2672 2672 describe_range_error(errcode);
2673 2673 return JNI_EINVAL;
2674 2674 }
2675 2675 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2676 2676 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2677 2677 julong max_stack_size = 0;
2678 2678 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2679 2679 if (errcode != arg_in_range) {
2680 2680 jio_fprintf(defaultStream::error_stream(),
2681 2681 "Invalid maximum mark stack size: %s\n",
2682 2682 option->optionString);
2683 2683 describe_range_error(errcode);
2684 2684 return JNI_EINVAL;
2685 2685 }
2686 2686 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2687 2687 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2688 2688 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2689 2689 uintx conc_threads = 0;
2690 2690 if (!parse_uintx(tail, &conc_threads, 1)) {
2691 2691 jio_fprintf(defaultStream::error_stream(),
2692 2692 "Invalid concurrent threads: %s\n", option->optionString);
2693 2693 return JNI_EINVAL;
2694 2694 }
2695 2695 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2696 2696 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2697 2697 // Skip -XX:Flags= since that case has already been handled
2698 2698 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2699 2699 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2700 2700 return JNI_EINVAL;
2701 2701 }
2702 2702 }
2703 2703 // Unknown option
2704 2704 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2705 2705 return JNI_ERR;
2706 2706 }
2707 2707 }
2708 2708
2709 2709 // Change the default value for flags which have different default values
2710 2710 // when working with older JDKs.
2711 2711 if (JDK_Version::current().compare_major(6) <= 0 &&
2712 2712 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2713 2713 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2714 2714 }
2715 2715 #ifdef LINUX
2716 2716 if (JDK_Version::current().compare_major(6) <= 0 &&
2717 2717 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2718 2718 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2719 2719 }
2720 2720 #endif // LINUX
2721 2721 return JNI_OK;
2722 2722 }
2723 2723
2724 2724 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2725 2725 // This must be done after all -D arguments have been processed.
2726 2726 scp_p->expand_endorsed();
2727 2727
2728 2728 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2729 2729 // Assemble the bootclasspath elements into the final path.
2730 2730 Arguments::set_sysclasspath(scp_p->combined_path());
2731 2731 }
2732 2732
2733 2733 // This must be done after all arguments have been processed.
2734 2734 // java_compiler() true means set to "NONE" or empty.
2735 2735 if (java_compiler() && !xdebug_mode()) {
2736 2736 // For backwards compatibility, we switch to interpreted mode if
2737 2737 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2738 2738 // not specified.
2739 2739 set_mode_flags(_int);
2740 2740 }
2741 2741 if (CompileThreshold == 0) {
2742 2742 set_mode_flags(_int);
2743 2743 }
2744 2744
2745 2745 #ifndef COMPILER2
2746 2746 // Don't degrade server performance for footprint
2747 2747 if (FLAG_IS_DEFAULT(UseLargePages) &&
2748 2748 MaxHeapSize < LargePageHeapSizeThreshold) {
2749 2749 // No need for large granularity pages w/small heaps.
2750 2750 // Note that large pages are enabled/disabled for both the
2751 2751 // Java heap and the code cache.
2752 2752 FLAG_SET_DEFAULT(UseLargePages, false);
2753 2753 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2754 2754 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2755 2755 }
2756 2756
2757 2757 // Tiered compilation is undefined with C1.
2758 2758 TieredCompilation = false;
2759 2759 #else
2760 2760 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2761 2761 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2762 2762 }
2763 2763 #endif
2764 2764
2765 2765 // If we are running in a headless jre, force java.awt.headless property
2766 2766 // to be true unless the property has already been set.
2767 2767 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2768 2768 if (os::is_headless_jre()) {
2769 2769 const char* headless = Arguments::get_property("java.awt.headless");
2770 2770 if (headless == NULL) {
2771 2771 char envbuffer[128];
2772 2772 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2773 2773 if (!add_property("java.awt.headless=true")) {
2774 2774 return JNI_ENOMEM;
2775 2775 }
2776 2776 } else {
2777 2777 char buffer[256];
2778 2778 strcpy(buffer, "java.awt.headless=");
2779 2779 strcat(buffer, envbuffer);
2780 2780 if (!add_property(buffer)) {
2781 2781 return JNI_ENOMEM;
2782 2782 }
2783 2783 }
2784 2784 }
2785 2785 }
2786 2786
2787 2787 if (!check_vm_args_consistency()) {
2788 2788 return JNI_ERR;
2789 2789 }
2790 2790
2791 2791 return JNI_OK;
2792 2792 }
2793 2793
2794 2794 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2795 2795 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2796 2796 scp_assembly_required_p);
2797 2797 }
2798 2798
2799 2799 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2800 2800 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2801 2801 scp_assembly_required_p);
2802 2802 }
2803 2803
2804 2804 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2805 2805 const int N_MAX_OPTIONS = 64;
2806 2806 const int OPTION_BUFFER_SIZE = 1024;
2807 2807 char buffer[OPTION_BUFFER_SIZE];
2808 2808
2809 2809 // The variable will be ignored if it exceeds the length of the buffer.
2810 2810 // Don't check this variable if user has special privileges
2811 2811 // (e.g. unix su command).
2812 2812 if (os::getenv(name, buffer, sizeof(buffer)) &&
2813 2813 !os::have_special_privileges()) {
2814 2814 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2815 2815 jio_fprintf(defaultStream::error_stream(),
2816 2816 "Picked up %s: %s\n", name, buffer);
2817 2817 char* rd = buffer; // pointer to the input string (rd)
2818 2818 int i;
2819 2819 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2820 2820 while (isspace(*rd)) rd++; // skip whitespace
2821 2821 if (*rd == 0) break; // we re done when the input string is read completely
2822 2822
2823 2823 // The output, option string, overwrites the input string.
2824 2824 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2825 2825 // input string (rd).
2826 2826 char* wrt = rd;
2827 2827
2828 2828 options[i++].optionString = wrt; // Fill in option
2829 2829 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2830 2830 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2831 2831 int quote = *rd; // matching quote to look for
2832 2832 rd++; // don't copy open quote
2833 2833 while (*rd != quote) { // include everything (even spaces) up until quote
2834 2834 if (*rd == 0) { // string termination means unmatched string
2835 2835 jio_fprintf(defaultStream::error_stream(),
2836 2836 "Unmatched quote in %s\n", name);
2837 2837 return JNI_ERR;
2838 2838 }
2839 2839 *wrt++ = *rd++; // copy to option string
2840 2840 }
2841 2841 rd++; // don't copy close quote
2842 2842 } else {
2843 2843 *wrt++ = *rd++; // copy to option string
2844 2844 }
2845 2845 }
2846 2846 // Need to check if we're done before writing a NULL,
2847 2847 // because the write could be to the byte that rd is pointing to.
2848 2848 if (*rd++ == 0) {
2849 2849 *wrt = 0;
2850 2850 break;
2851 2851 }
2852 2852 *wrt = 0; // Zero terminate option
2853 2853 }
2854 2854 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2855 2855 JavaVMInitArgs vm_args;
2856 2856 vm_args.version = JNI_VERSION_1_2;
2857 2857 vm_args.options = options;
2858 2858 vm_args.nOptions = i;
2859 2859 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2860 2860
2861 2861 if (PrintVMOptions) {
2862 2862 const char* tail;
2863 2863 for (int i = 0; i < vm_args.nOptions; i++) {
2864 2864 const JavaVMOption *option = vm_args.options + i;
2865 2865 if (match_option(option, "-XX:", &tail)) {
2866 2866 logOption(tail);
2867 2867 }
2868 2868 }
2869 2869 }
2870 2870
2871 2871 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2872 2872 }
2873 2873 return JNI_OK;
2874 2874 }
2875 2875
2876 2876 void Arguments::set_shared_spaces_flags() {
2877 2877 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
2878 2878 const bool might_share = must_share || UseSharedSpaces;
2879 2879
2880 2880 // The string table is part of the shared archive so the size must match.
2881 2881 if (!FLAG_IS_DEFAULT(StringTableSize)) {
2882 2882 // Disable sharing.
2883 2883 if (must_share) {
2884 2884 warning("disabling shared archive %s because of non-default "
2885 2885 "StringTableSize", DumpSharedSpaces ? "creation" : "use");
2886 2886 }
2887 2887 if (might_share) {
2888 2888 FLAG_SET_DEFAULT(DumpSharedSpaces, false);
2889 2889 FLAG_SET_DEFAULT(RequireSharedSpaces, false);
2890 2890 FLAG_SET_DEFAULT(UseSharedSpaces, false);
2891 2891 }
2892 2892 return;
2893 2893 }
2894 2894
2895 2895 // Check whether class data sharing settings conflict with GC, compressed oops
2896 2896 // or page size, and fix them up. Explicit sharing options override other
2897 2897 // settings.
2898 2898 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
2899 2899 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
2900 2900 UseCompressedOops || UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
2901 2901 if (cannot_share) {
2902 2902 if (must_share) {
2903 2903 warning("selecting serial gc and disabling large pages %s"
2904 2904 "because of %s", "" LP64_ONLY("and compressed oops "),
2905 2905 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
2906 2906 force_serial_gc();
2907 2907 FLAG_SET_CMDLINE(bool, UseLargePages, false);
2908 2908 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
2909 2909 } else {
2910 2910 if (UseSharedSpaces && Verbose) {
2911 2911 warning("turning off use of shared archive because of "
2912 2912 "choice of garbage collector or large pages");
2913 2913 }
2914 2914 no_shared_spaces();
2915 2915 }
2916 2916 } else if (UseLargePages && might_share) {
2917 2917 // Disable large pages to allow shared spaces. This is sub-optimal, since
2918 2918 // there may not even be a shared archive to use.
2919 2919 FLAG_SET_DEFAULT(UseLargePages, false);
2920 2920 }
2921 2921 }
2922 2922
2923 2923 // Disable options not supported in this release, with a warning if they
2924 2924 // were explicitly requested on the command-line
2925 2925 #define UNSUPPORTED_OPTION(opt, description) \
2926 2926 do { \
2927 2927 if (opt) { \
2928 2928 if (FLAG_IS_CMDLINE(opt)) { \
2929 2929 warning(description " is disabled in this release."); \
2930 2930 } \
2931 2931 FLAG_SET_DEFAULT(opt, false); \
2932 2932 } \
2933 2933 } while(0)
2934 2934
2935 2935 // Parse entry point called from JNI_CreateJavaVM
2936 2936
2937 2937 jint Arguments::parse(const JavaVMInitArgs* args) {
2938 2938
2939 2939 // Sharing support
2940 2940 // Construct the path to the archive
2941 2941 char jvm_path[JVM_MAXPATHLEN];
2942 2942 os::jvm_path(jvm_path, sizeof(jvm_path));
2943 2943 #ifdef TIERED
2944 2944 if (strstr(jvm_path, "client") != NULL) {
2945 2945 force_client_mode = true;
2946 2946 }
2947 2947 #endif // TIERED
2948 2948 char *end = strrchr(jvm_path, *os::file_separator());
2949 2949 if (end != NULL) *end = '\0';
2950 2950 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2951 2951 strlen(os::file_separator()) + 20);
2952 2952 if (shared_archive_path == NULL) return JNI_ENOMEM;
2953 2953 strcpy(shared_archive_path, jvm_path);
2954 2954 strcat(shared_archive_path, os::file_separator());
2955 2955 strcat(shared_archive_path, "classes");
2956 2956 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2957 2957 strcat(shared_archive_path, ".jsa");
2958 2958 SharedArchivePath = shared_archive_path;
2959 2959
2960 2960 // Remaining part of option string
2961 2961 const char* tail;
2962 2962
2963 2963 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2964 2964 bool settings_file_specified = false;
2965 2965 const char* flags_file;
2966 2966 int index;
2967 2967 for (index = 0; index < args->nOptions; index++) {
2968 2968 const JavaVMOption *option = args->options + index;
2969 2969 if (match_option(option, "-XX:Flags=", &tail)) {
2970 2970 flags_file = tail;
2971 2971 settings_file_specified = true;
2972 2972 }
2973 2973 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2974 2974 PrintVMOptions = true;
2975 2975 }
2976 2976 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2977 2977 PrintVMOptions = false;
2978 2978 }
2979 2979 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2980 2980 IgnoreUnrecognizedVMOptions = true;
2981 2981 }
2982 2982 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2983 2983 IgnoreUnrecognizedVMOptions = false;
2984 2984 }
2985 2985 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
2986 2986 CommandLineFlags::printFlags(tty, false);
2987 2987 vm_exit(0);
2988 2988 }
2989 2989
2990 2990 #ifndef PRODUCT
2991 2991 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
2992 2992 CommandLineFlags::printFlags(tty, true);
2993 2993 vm_exit(0);
2994 2994 }
2995 2995 #endif
2996 2996 }
2997 2997
2998 2998 if (IgnoreUnrecognizedVMOptions) {
2999 2999 // uncast const to modify the flag args->ignoreUnrecognized
3000 3000 *(jboolean*)(&args->ignoreUnrecognized) = true;
3001 3001 }
3002 3002
3003 3003 // Parse specified settings file
3004 3004 if (settings_file_specified) {
3005 3005 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3006 3006 return JNI_EINVAL;
3007 3007 }
3008 3008 }
3009 3009
3010 3010 // Parse default .hotspotrc settings file
3011 3011 if (!settings_file_specified) {
3012 3012 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3013 3013 return JNI_EINVAL;
3014 3014 }
3015 3015 }
3016 3016
3017 3017 if (PrintVMOptions) {
3018 3018 for (index = 0; index < args->nOptions; index++) {
3019 3019 const JavaVMOption *option = args->options + index;
3020 3020 if (match_option(option, "-XX:", &tail)) {
3021 3021 logOption(tail);
3022 3022 }
3023 3023 }
3024 3024 }
3025 3025
3026 3026 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3027 3027 jint result = parse_vm_init_args(args);
3028 3028 if (result != JNI_OK) {
3029 3029 return result;
3030 3030 }
3031 3031
3032 3032 #ifdef JAVASE_EMBEDDED
3033 3033 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3034 3034 #endif
3035 3035
3036 3036 #ifndef PRODUCT
3037 3037 if (TraceBytecodesAt != 0) {
3038 3038 TraceBytecodes = true;
3039 3039 }
3040 3040 if (CountCompiledCalls) {
3041 3041 if (UseCounterDecay) {
3042 3042 warning("UseCounterDecay disabled because CountCalls is set");
3043 3043 UseCounterDecay = false;
3044 3044 }
3045 3045 }
3046 3046 #endif // PRODUCT
3047 3047
3048 3048 // Transitional
3049 3049 if (EnableMethodHandles || AnonymousClasses) {
3050 3050 if (!EnableInvokeDynamic && !FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3051 3051 warning("EnableMethodHandles and AnonymousClasses are obsolete. Keeping EnableInvokeDynamic disabled.");
3052 3052 } else {
3053 3053 EnableInvokeDynamic = true;
3054 3054 }
3055 3055 }
3056 3056
3057 3057 // JSR 292 is not supported before 1.7
3058 3058 if (!JDK_Version::is_gte_jdk17x_version()) {
3059 3059 if (EnableInvokeDynamic) {
3060 3060 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3061 3061 warning("JSR 292 is not supported before 1.7. Disabling support.");
3062 3062 }
3063 3063 EnableInvokeDynamic = false;
3064 3064 }
3065 3065 }
3066 3066
3067 3067 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3068 3068 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3069 3069 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3070 3070 }
3071 3071 ScavengeRootsInCode = 1;
3072 3072 }
3073 3073 if (!JavaObjectsInPerm && ScavengeRootsInCode == 0) {
3074 3074 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3075 3075 warning("forcing ScavengeRootsInCode non-zero because JavaObjectsInPerm is false");
3076 3076 }
3077 3077 ScavengeRootsInCode = 1;
3078 3078 }
3079 3079
3080 3080 if (PrintGCDetails) {
3081 3081 // Turn on -verbose:gc options as well
3082 3082 PrintGC = true;
3083 3083 }
3084 3084
3085 3085 // Set object alignment values.
3086 3086 set_object_alignment();
3087 3087
3088 3088 #ifdef SERIALGC
3089 3089 force_serial_gc();
3090 3090 #endif // SERIALGC
3091 3091 #ifdef KERNEL
3092 3092 no_shared_spaces();
3093 3093 #endif // KERNEL
3094 3094
3095 3095 // Set flags based on ergonomics.
3096 3096 set_ergonomics_flags();
3097 3097
3098 3098 set_shared_spaces_flags();
3099 3099
3100 3100 // Check the GC selections again.
3101 3101 if (!check_gc_consistency()) {
3102 3102 return JNI_EINVAL;
3103 3103 }
3104 3104
3105 3105 if (TieredCompilation) {
3106 3106 set_tiered_flags();
3107 3107 } else {
3108 3108 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3109 3109 if (CompilationPolicyChoice >= 2) {
3110 3110 vm_exit_during_initialization(
3111 3111 "Incompatible compilation policy selected", NULL);
3112 3112 }
3113 3113 }
3114 3114
3115 3115 #ifndef KERNEL
3116 3116 // Set heap size based on available physical memory
3117 3117 set_heap_size();
3118 3118 // Set per-collector flags
3119 3119 if (UseParallelGC || UseParallelOldGC) {
3120 3120 set_parallel_gc_flags();
3121 3121 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3122 3122 set_cms_and_parnew_gc_flags();
3123 3123 } else if (UseParNewGC) { // skipped if CMS is set above
3124 3124 set_parnew_gc_flags();
3125 3125 } else if (UseG1GC) {
3126 3126 set_g1_gc_flags();
3127 3127 }
3128 3128 #endif // KERNEL
3129 3129
3130 3130 #ifdef SERIALGC
3131 3131 assert(verify_serial_gc_flags(), "SerialGC unset");
3132 3132 #endif // SERIALGC
3133 3133
3134 3134 // Set bytecode rewriting flags
3135 3135 set_bytecode_flags();
3136 3136
3137 3137 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3138 3138 set_aggressive_opts_flags();
3139 3139
3140 3140 // Turn off biased locking for locking debug mode flags,
3141 3141 // which are subtlely different from each other but neither works with
3142 3142 // biased locking.
3143 3143 if (UseHeavyMonitors
3144 3144 #ifdef COMPILER1
3145 3145 || !UseFastLocking
3146 3146 #endif // COMPILER1
3147 3147 ) {
3148 3148 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3149 3149 // flag set to true on command line; warn the user that they
3150 3150 // can't enable biased locking here
3151 3151 warning("Biased Locking is not supported with locking debug flags"
3152 3152 "; ignoring UseBiasedLocking flag." );
3153 3153 }
3154 3154 UseBiasedLocking = false;
3155 3155 }
3156 3156
3157 3157 #ifdef CC_INTERP
3158 3158 // Clear flags not supported by the C++ interpreter
3159 3159 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3160 3160 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3161 3161 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3162 3162 #endif // CC_INTERP
3163 3163
3164 3164 #ifdef COMPILER2
3165 3165 if (!UseBiasedLocking || EmitSync != 0) {
3166 3166 UseOptoBiasInlining = false;
3167 3167 }
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3168 3168 if (!EliminateLocks) {
3169 3169 EliminateNestedLocks = false;
3170 3170 }
3171 3171 #endif
3172 3172
3173 3173 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3174 3174 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3175 3175 DebugNonSafepoints = true;
3176 3176 }
3177 3177
3178 -#ifndef PRODUCT
3179 - if (CompileTheWorld) {
3180 - // Force NmethodSweeper to sweep whole CodeCache each time.
3181 - if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3182 - NmethodSweepFraction = 1;
3183 - }
3184 - }
3185 -#endif
3186 -
3187 3178 if (PrintCommandLineFlags) {
3188 3179 CommandLineFlags::printSetFlags(tty);
3189 3180 }
3190 3181
3191 3182 // Apply CPU specific policy for the BiasedLocking
3192 3183 if (UseBiasedLocking) {
3193 3184 if (!VM_Version::use_biased_locking() &&
3194 3185 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3195 3186 UseBiasedLocking = false;
3196 3187 }
3197 3188 }
3198 3189
3199 3190 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3200 3191 // but only if not already set on the commandline
3201 3192 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3202 3193 bool set = false;
3203 3194 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3204 3195 if (!set) {
3205 3196 FLAG_SET_DEFAULT(PauseAtExit, true);
3206 3197 }
3207 3198 }
3208 3199
3209 3200 return JNI_OK;
3210 3201 }
3211 3202
3212 3203 int Arguments::PropertyList_count(SystemProperty* pl) {
3213 3204 int count = 0;
3214 3205 while(pl != NULL) {
3215 3206 count++;
3216 3207 pl = pl->next();
3217 3208 }
3218 3209 return count;
3219 3210 }
3220 3211
3221 3212 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3222 3213 assert(key != NULL, "just checking");
3223 3214 SystemProperty* prop;
3224 3215 for (prop = pl; prop != NULL; prop = prop->next()) {
3225 3216 if (strcmp(key, prop->key()) == 0) return prop->value();
3226 3217 }
3227 3218 return NULL;
3228 3219 }
3229 3220
3230 3221 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3231 3222 int count = 0;
3232 3223 const char* ret_val = NULL;
3233 3224
3234 3225 while(pl != NULL) {
3235 3226 if(count >= index) {
3236 3227 ret_val = pl->key();
3237 3228 break;
3238 3229 }
3239 3230 count++;
3240 3231 pl = pl->next();
3241 3232 }
3242 3233
3243 3234 return ret_val;
3244 3235 }
3245 3236
3246 3237 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3247 3238 int count = 0;
3248 3239 char* ret_val = NULL;
3249 3240
3250 3241 while(pl != NULL) {
3251 3242 if(count >= index) {
3252 3243 ret_val = pl->value();
3253 3244 break;
3254 3245 }
3255 3246 count++;
3256 3247 pl = pl->next();
3257 3248 }
3258 3249
3259 3250 return ret_val;
3260 3251 }
3261 3252
3262 3253 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3263 3254 SystemProperty* p = *plist;
3264 3255 if (p == NULL) {
3265 3256 *plist = new_p;
3266 3257 } else {
3267 3258 while (p->next() != NULL) {
3268 3259 p = p->next();
3269 3260 }
3270 3261 p->set_next(new_p);
3271 3262 }
3272 3263 }
3273 3264
3274 3265 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3275 3266 if (plist == NULL)
3276 3267 return;
3277 3268
3278 3269 SystemProperty* new_p = new SystemProperty(k, v, true);
3279 3270 PropertyList_add(plist, new_p);
3280 3271 }
3281 3272
3282 3273 // This add maintains unique property key in the list.
3283 3274 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3284 3275 if (plist == NULL)
3285 3276 return;
3286 3277
3287 3278 // If property key exist then update with new value.
3288 3279 SystemProperty* prop;
3289 3280 for (prop = *plist; prop != NULL; prop = prop->next()) {
3290 3281 if (strcmp(k, prop->key()) == 0) {
3291 3282 if (append) {
3292 3283 prop->append_value(v);
3293 3284 } else {
3294 3285 prop->set_value(v);
3295 3286 }
3296 3287 return;
3297 3288 }
3298 3289 }
3299 3290
3300 3291 PropertyList_add(plist, k, v);
3301 3292 }
3302 3293
3303 3294 #ifdef KERNEL
3304 3295 char *Arguments::get_kernel_properties() {
3305 3296 // Find properties starting with kernel and append them to string
3306 3297 // We need to find out how long they are first because the URL's that they
3307 3298 // might point to could get long.
3308 3299 int length = 0;
3309 3300 SystemProperty* prop;
3310 3301 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3311 3302 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3312 3303 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3313 3304 }
3314 3305 }
3315 3306 // Add one for null terminator.
3316 3307 char *props = AllocateHeap(length + 1, "get_kernel_properties");
3317 3308 if (length != 0) {
3318 3309 int pos = 0;
3319 3310 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3320 3311 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3321 3312 jio_snprintf(&props[pos], length-pos,
3322 3313 "-D%s=%s ", prop->key(), prop->value());
3323 3314 pos = strlen(props);
3324 3315 }
3325 3316 }
3326 3317 }
3327 3318 // null terminate props in case of null
3328 3319 props[length] = '\0';
3329 3320 return props;
3330 3321 }
3331 3322 #endif // KERNEL
3332 3323
3333 3324 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3334 3325 // Returns true if all of the source pointed by src has been copied over to
3335 3326 // the destination buffer pointed by buf. Otherwise, returns false.
3336 3327 // Notes:
3337 3328 // 1. If the length (buflen) of the destination buffer excluding the
3338 3329 // NULL terminator character is not long enough for holding the expanded
3339 3330 // pid characters, it also returns false instead of returning the partially
3340 3331 // expanded one.
3341 3332 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3342 3333 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3343 3334 char* buf, size_t buflen) {
3344 3335 const char* p = src;
3345 3336 char* b = buf;
3346 3337 const char* src_end = &src[srclen];
3347 3338 char* buf_end = &buf[buflen - 1];
3348 3339
3349 3340 while (p < src_end && b < buf_end) {
3350 3341 if (*p == '%') {
3351 3342 switch (*(++p)) {
3352 3343 case '%': // "%%" ==> "%"
3353 3344 *b++ = *p++;
3354 3345 break;
3355 3346 case 'p': { // "%p" ==> current process id
3356 3347 // buf_end points to the character before the last character so
3357 3348 // that we could write '\0' to the end of the buffer.
3358 3349 size_t buf_sz = buf_end - b + 1;
3359 3350 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3360 3351
3361 3352 // if jio_snprintf fails or the buffer is not long enough to hold
3362 3353 // the expanded pid, returns false.
3363 3354 if (ret < 0 || ret >= (int)buf_sz) {
3364 3355 return false;
3365 3356 } else {
3366 3357 b += ret;
3367 3358 assert(*b == '\0', "fail in copy_expand_pid");
3368 3359 if (p == src_end && b == buf_end + 1) {
3369 3360 // reach the end of the buffer.
3370 3361 return true;
3371 3362 }
3372 3363 }
3373 3364 p++;
3374 3365 break;
3375 3366 }
3376 3367 default :
3377 3368 *b++ = '%';
3378 3369 }
3379 3370 } else {
3380 3371 *b++ = *p++;
3381 3372 }
3382 3373 }
3383 3374 *b = '\0';
3384 3375 return (p == src_end); // return false if not all of the source was copied
3385 3376 }
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