arguments.cpp revision 3724:8e47bac5643a
1/* 2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "precompiled.hpp" 26#include "classfile/javaAssertions.hpp" 27#include "compiler/compilerOracle.hpp" 28#include "memory/allocation.inline.hpp" 29#include "memory/cardTableRS.hpp" 30#include "memory/referenceProcessor.hpp" 31#include "memory/universe.inline.hpp" 32#include "oops/oop.inline.hpp" 33#include "prims/jvmtiExport.hpp" 34#include "runtime/arguments.hpp" 35#include "runtime/globals_extension.hpp" 36#include "runtime/java.hpp" 37#include "services/management.hpp" 38#include "services/memTracker.hpp" 39#include "utilities/defaultStream.hpp" 40#include "utilities/taskqueue.hpp" 41#ifdef TARGET_OS_FAMILY_linux 42# include "os_linux.inline.hpp" 43#endif 44#ifdef TARGET_OS_FAMILY_solaris 45# include "os_solaris.inline.hpp" 46#endif 47#ifdef TARGET_OS_FAMILY_windows 48# include "os_windows.inline.hpp" 49#endif 50#ifdef TARGET_OS_FAMILY_bsd 51# include "os_bsd.inline.hpp" 52#endif 53#ifndef SERIALGC 54#include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 55#endif 56 57// Note: This is a special bug reporting site for the JVM 58#define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp" 59#define DEFAULT_JAVA_LAUNCHER "generic" 60 61char** Arguments::_jvm_flags_array = NULL; 62int Arguments::_num_jvm_flags = 0; 63char** Arguments::_jvm_args_array = NULL; 64int Arguments::_num_jvm_args = 0; 65char* Arguments::_java_command = NULL; 66SystemProperty* Arguments::_system_properties = NULL; 67const char* Arguments::_gc_log_filename = NULL; 68bool Arguments::_has_profile = false; 69bool Arguments::_has_alloc_profile = false; 70uintx Arguments::_min_heap_size = 0; 71Arguments::Mode Arguments::_mode = _mixed; 72bool Arguments::_java_compiler = false; 73bool Arguments::_xdebug_mode = false; 74const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 75const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 76int Arguments::_sun_java_launcher_pid = -1; 77bool Arguments::_created_by_gamma_launcher = false; 78 79// These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 80bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 81bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 82bool Arguments::_BackgroundCompilation = BackgroundCompilation; 83bool Arguments::_ClipInlining = ClipInlining; 84 85char* Arguments::SharedArchivePath = NULL; 86 87AgentLibraryList Arguments::_libraryList; 88AgentLibraryList Arguments::_agentList; 89 90abort_hook_t Arguments::_abort_hook = NULL; 91exit_hook_t Arguments::_exit_hook = NULL; 92vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 93 94 95SystemProperty *Arguments::_java_ext_dirs = NULL; 96SystemProperty *Arguments::_java_endorsed_dirs = NULL; 97SystemProperty *Arguments::_sun_boot_library_path = NULL; 98SystemProperty *Arguments::_java_library_path = NULL; 99SystemProperty *Arguments::_java_home = NULL; 100SystemProperty *Arguments::_java_class_path = NULL; 101SystemProperty *Arguments::_sun_boot_class_path = NULL; 102 103char* Arguments::_meta_index_path = NULL; 104char* Arguments::_meta_index_dir = NULL; 105 106// Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 107 108static bool match_option(const JavaVMOption *option, const char* name, 109 const char** tail) { 110 int len = (int)strlen(name); 111 if (strncmp(option->optionString, name, len) == 0) { 112 *tail = option->optionString + len; 113 return true; 114 } else { 115 return false; 116 } 117} 118 119static void logOption(const char* opt) { 120 if (PrintVMOptions) { 121 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 122 } 123} 124 125// Process java launcher properties. 126void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 127 // See if sun.java.launcher or sun.java.launcher.pid is defined. 128 // Must do this before setting up other system properties, 129 // as some of them may depend on launcher type. 130 for (int index = 0; index < args->nOptions; index++) { 131 const JavaVMOption* option = args->options + index; 132 const char* tail; 133 134 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 135 process_java_launcher_argument(tail, option->extraInfo); 136 continue; 137 } 138 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 139 _sun_java_launcher_pid = atoi(tail); 140 continue; 141 } 142 } 143} 144 145// Initialize system properties key and value. 146void Arguments::init_system_properties() { 147 148 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 149 "Java Virtual Machine Specification", false)); 150 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 151 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 153 154 // following are JVMTI agent writeable properties. 155 // Properties values are set to NULL and they are 156 // os specific they are initialized in os::init_system_properties_values(). 157 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 158 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 159 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 160 _java_library_path = new SystemProperty("java.library.path", NULL, true); 161 _java_home = new SystemProperty("java.home", NULL, true); 162 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 163 164 _java_class_path = new SystemProperty("java.class.path", "", true); 165 166 // Add to System Property list. 167 PropertyList_add(&_system_properties, _java_ext_dirs); 168 PropertyList_add(&_system_properties, _java_endorsed_dirs); 169 PropertyList_add(&_system_properties, _sun_boot_library_path); 170 PropertyList_add(&_system_properties, _java_library_path); 171 PropertyList_add(&_system_properties, _java_home); 172 PropertyList_add(&_system_properties, _java_class_path); 173 PropertyList_add(&_system_properties, _sun_boot_class_path); 174 175 // Set OS specific system properties values 176 os::init_system_properties_values(); 177} 178 179 180 // Update/Initialize System properties after JDK version number is known 181void Arguments::init_version_specific_system_properties() { 182 enum { bufsz = 16 }; 183 char buffer[bufsz]; 184 const char* spec_vendor = "Sun Microsystems Inc."; 185 uint32_t spec_version = 0; 186 187 if (JDK_Version::is_gte_jdk17x_version()) { 188 spec_vendor = "Oracle Corporation"; 189 spec_version = JDK_Version::current().major_version(); 190 } 191 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 192 193 PropertyList_add(&_system_properties, 194 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 195 PropertyList_add(&_system_properties, 196 new SystemProperty("java.vm.specification.version", buffer, false)); 197 PropertyList_add(&_system_properties, 198 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 199} 200 201/** 202 * Provide a slightly more user-friendly way of eliminating -XX flags. 203 * When a flag is eliminated, it can be added to this list in order to 204 * continue accepting this flag on the command-line, while issuing a warning 205 * and ignoring the value. Once the JDK version reaches the 'accept_until' 206 * limit, we flatly refuse to admit the existence of the flag. This allows 207 * a flag to die correctly over JDK releases using HSX. 208 */ 209typedef struct { 210 const char* name; 211 JDK_Version obsoleted_in; // when the flag went away 212 JDK_Version accept_until; // which version to start denying the existence 213} ObsoleteFlag; 214 215static ObsoleteFlag obsolete_jvm_flags[] = { 216 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 217 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 218 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 219 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 220 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 221 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 222 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 223 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 224 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 225 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 226 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 227 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 228 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 229 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 230 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 231 { "DefaultInitialRAMFraction", 232 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 233 { "UseDepthFirstScavengeOrder", 234 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 235 { "HandlePromotionFailure", 236 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 237 { "MaxLiveObjectEvacuationRatio", 238 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 239 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 240 { "UseParallelOldGCCompacting", 241 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 242 { "UseParallelDensePrefixUpdate", 243 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 244 { "UseParallelOldGCDensePrefix", 245 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 246 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 247 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 248 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 249 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 250 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 251 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 252 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 253 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 254 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 255 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 256 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 257 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 258 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 259 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 260#ifdef PRODUCT 261 { "DesiredMethodLimit", 262 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 263#endif // PRODUCT 264 { NULL, JDK_Version(0), JDK_Version(0) } 265}; 266 267// Returns true if the flag is obsolete and fits into the range specified 268// for being ignored. In the case that the flag is ignored, the 'version' 269// value is filled in with the version number when the flag became 270// obsolete so that that value can be displayed to the user. 271bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 272 int i = 0; 273 assert(version != NULL, "Must provide a version buffer"); 274 while (obsolete_jvm_flags[i].name != NULL) { 275 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 276 // <flag>=xxx form 277 // [-|+]<flag> form 278 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 279 ((s[0] == '+' || s[0] == '-') && 280 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 281 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 282 *version = flag_status.obsoleted_in; 283 return true; 284 } 285 } 286 i++; 287 } 288 return false; 289} 290 291// Constructs the system class path (aka boot class path) from the following 292// components, in order: 293// 294// prefix // from -Xbootclasspath/p:... 295// endorsed // the expansion of -Djava.endorsed.dirs=... 296// base // from os::get_system_properties() or -Xbootclasspath= 297// suffix // from -Xbootclasspath/a:... 298// 299// java.endorsed.dirs is a list of directories; any jar or zip files in the 300// directories are added to the sysclasspath just before the base. 301// 302// This could be AllStatic, but it isn't needed after argument processing is 303// complete. 304class SysClassPath: public StackObj { 305public: 306 SysClassPath(const char* base); 307 ~SysClassPath(); 308 309 inline void set_base(const char* base); 310 inline void add_prefix(const char* prefix); 311 inline void add_suffix_to_prefix(const char* suffix); 312 inline void add_suffix(const char* suffix); 313 inline void reset_path(const char* base); 314 315 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 316 // property. Must be called after all command-line arguments have been 317 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 318 // combined_path(). 319 void expand_endorsed(); 320 321 inline const char* get_base() const { return _items[_scp_base]; } 322 inline const char* get_prefix() const { return _items[_scp_prefix]; } 323 inline const char* get_suffix() const { return _items[_scp_suffix]; } 324 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 325 326 // Combine all the components into a single c-heap-allocated string; caller 327 // must free the string if/when no longer needed. 328 char* combined_path(); 329 330private: 331 // Utility routines. 332 static char* add_to_path(const char* path, const char* str, bool prepend); 333 static char* add_jars_to_path(char* path, const char* directory); 334 335 inline void reset_item_at(int index); 336 337 // Array indices for the items that make up the sysclasspath. All except the 338 // base are allocated in the C heap and freed by this class. 339 enum { 340 _scp_prefix, // from -Xbootclasspath/p:... 341 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 342 _scp_base, // the default sysclasspath 343 _scp_suffix, // from -Xbootclasspath/a:... 344 _scp_nitems // the number of items, must be last. 345 }; 346 347 const char* _items[_scp_nitems]; 348 DEBUG_ONLY(bool _expansion_done;) 349}; 350 351SysClassPath::SysClassPath(const char* base) { 352 memset(_items, 0, sizeof(_items)); 353 _items[_scp_base] = base; 354 DEBUG_ONLY(_expansion_done = false;) 355} 356 357SysClassPath::~SysClassPath() { 358 // Free everything except the base. 359 for (int i = 0; i < _scp_nitems; ++i) { 360 if (i != _scp_base) reset_item_at(i); 361 } 362 DEBUG_ONLY(_expansion_done = false;) 363} 364 365inline void SysClassPath::set_base(const char* base) { 366 _items[_scp_base] = base; 367} 368 369inline void SysClassPath::add_prefix(const char* prefix) { 370 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 371} 372 373inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 374 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 375} 376 377inline void SysClassPath::add_suffix(const char* suffix) { 378 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 379} 380 381inline void SysClassPath::reset_item_at(int index) { 382 assert(index < _scp_nitems && index != _scp_base, "just checking"); 383 if (_items[index] != NULL) { 384 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 385 _items[index] = NULL; 386 } 387} 388 389inline void SysClassPath::reset_path(const char* base) { 390 // Clear the prefix and suffix. 391 reset_item_at(_scp_prefix); 392 reset_item_at(_scp_suffix); 393 set_base(base); 394} 395 396//------------------------------------------------------------------------------ 397 398void SysClassPath::expand_endorsed() { 399 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 400 401 const char* path = Arguments::get_property("java.endorsed.dirs"); 402 if (path == NULL) { 403 path = Arguments::get_endorsed_dir(); 404 assert(path != NULL, "no default for java.endorsed.dirs"); 405 } 406 407 char* expanded_path = NULL; 408 const char separator = *os::path_separator(); 409 const char* const end = path + strlen(path); 410 while (path < end) { 411 const char* tmp_end = strchr(path, separator); 412 if (tmp_end == NULL) { 413 expanded_path = add_jars_to_path(expanded_path, path); 414 path = end; 415 } else { 416 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 417 memcpy(dirpath, path, tmp_end - path); 418 dirpath[tmp_end - path] = '\0'; 419 expanded_path = add_jars_to_path(expanded_path, dirpath); 420 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 421 path = tmp_end + 1; 422 } 423 } 424 _items[_scp_endorsed] = expanded_path; 425 DEBUG_ONLY(_expansion_done = true;) 426} 427 428// Combine the bootclasspath elements, some of which may be null, into a single 429// c-heap-allocated string. 430char* SysClassPath::combined_path() { 431 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 432 assert(_expansion_done, "must call expand_endorsed() first."); 433 434 size_t lengths[_scp_nitems]; 435 size_t total_len = 0; 436 437 const char separator = *os::path_separator(); 438 439 // Get the lengths. 440 int i; 441 for (i = 0; i < _scp_nitems; ++i) { 442 if (_items[i] != NULL) { 443 lengths[i] = strlen(_items[i]); 444 // Include space for the separator char (or a NULL for the last item). 445 total_len += lengths[i] + 1; 446 } 447 } 448 assert(total_len > 0, "empty sysclasspath not allowed"); 449 450 // Copy the _items to a single string. 451 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 452 char* cp_tmp = cp; 453 for (i = 0; i < _scp_nitems; ++i) { 454 if (_items[i] != NULL) { 455 memcpy(cp_tmp, _items[i], lengths[i]); 456 cp_tmp += lengths[i]; 457 *cp_tmp++ = separator; 458 } 459 } 460 *--cp_tmp = '\0'; // Replace the extra separator. 461 return cp; 462} 463 464// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 465char* 466SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 467 char *cp; 468 469 assert(str != NULL, "just checking"); 470 if (path == NULL) { 471 size_t len = strlen(str) + 1; 472 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 473 memcpy(cp, str, len); // copy the trailing null 474 } else { 475 const char separator = *os::path_separator(); 476 size_t old_len = strlen(path); 477 size_t str_len = strlen(str); 478 size_t len = old_len + str_len + 2; 479 480 if (prepend) { 481 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 482 char* cp_tmp = cp; 483 memcpy(cp_tmp, str, str_len); 484 cp_tmp += str_len; 485 *cp_tmp = separator; 486 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 487 FREE_C_HEAP_ARRAY(char, path, mtInternal); 488 } else { 489 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 490 char* cp_tmp = cp + old_len; 491 *cp_tmp = separator; 492 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 493 } 494 } 495 return cp; 496} 497 498// Scan the directory and append any jar or zip files found to path. 499// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 500char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 501 DIR* dir = os::opendir(directory); 502 if (dir == NULL) return path; 503 504 char dir_sep[2] = { '\0', '\0' }; 505 size_t directory_len = strlen(directory); 506 const char fileSep = *os::file_separator(); 507 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 508 509 /* Scan the directory for jars/zips, appending them to path. */ 510 struct dirent *entry; 511 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 512 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 513 const char* name = entry->d_name; 514 const char* ext = name + strlen(name) - 4; 515 bool isJarOrZip = ext > name && 516 (os::file_name_strcmp(ext, ".jar") == 0 || 517 os::file_name_strcmp(ext, ".zip") == 0); 518 if (isJarOrZip) { 519 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 520 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 521 path = add_to_path(path, jarpath, false); 522 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 523 } 524 } 525 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 526 os::closedir(dir); 527 return path; 528} 529 530// Parses a memory size specification string. 531static bool atomull(const char *s, julong* result) { 532 julong n = 0; 533 int args_read = sscanf(s, os::julong_format_specifier(), &n); 534 if (args_read != 1) { 535 return false; 536 } 537 while (*s != '\0' && isdigit(*s)) { 538 s++; 539 } 540 // 4705540: illegal if more characters are found after the first non-digit 541 if (strlen(s) > 1) { 542 return false; 543 } 544 switch (*s) { 545 case 'T': case 't': 546 *result = n * G * K; 547 // Check for overflow. 548 if (*result/((julong)G * K) != n) return false; 549 return true; 550 case 'G': case 'g': 551 *result = n * G; 552 if (*result/G != n) return false; 553 return true; 554 case 'M': case 'm': 555 *result = n * M; 556 if (*result/M != n) return false; 557 return true; 558 case 'K': case 'k': 559 *result = n * K; 560 if (*result/K != n) return false; 561 return true; 562 case '\0': 563 *result = n; 564 return true; 565 default: 566 return false; 567 } 568} 569 570Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 571 if (size < min_size) return arg_too_small; 572 // Check that size will fit in a size_t (only relevant on 32-bit) 573 if (size > max_uintx) return arg_too_big; 574 return arg_in_range; 575} 576 577// Describe an argument out of range error 578void Arguments::describe_range_error(ArgsRange errcode) { 579 switch(errcode) { 580 case arg_too_big: 581 jio_fprintf(defaultStream::error_stream(), 582 "The specified size exceeds the maximum " 583 "representable size.\n"); 584 break; 585 case arg_too_small: 586 case arg_unreadable: 587 case arg_in_range: 588 // do nothing for now 589 break; 590 default: 591 ShouldNotReachHere(); 592 } 593} 594 595static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) { 596 return CommandLineFlags::boolAtPut(name, &value, origin); 597} 598 599static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 600 double v; 601 if (sscanf(value, "%lf", &v) != 1) { 602 return false; 603 } 604 605 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 606 return true; 607 } 608 return false; 609} 610 611static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 612 julong v; 613 intx intx_v; 614 bool is_neg = false; 615 // Check the sign first since atomull() parses only unsigned values. 616 if (*value == '-') { 617 if (!CommandLineFlags::intxAt(name, &intx_v)) { 618 return false; 619 } 620 value++; 621 is_neg = true; 622 } 623 if (!atomull(value, &v)) { 624 return false; 625 } 626 intx_v = (intx) v; 627 if (is_neg) { 628 intx_v = -intx_v; 629 } 630 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 631 return true; 632 } 633 uintx uintx_v = (uintx) v; 634 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 635 return true; 636 } 637 uint64_t uint64_t_v = (uint64_t) v; 638 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 639 return true; 640 } 641 return false; 642} 643 644static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) { 645 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 646 // Contract: CommandLineFlags always returns a pointer that needs freeing. 647 FREE_C_HEAP_ARRAY(char, value, mtInternal); 648 return true; 649} 650 651static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) { 652 const char* old_value = ""; 653 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 654 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 655 size_t new_len = strlen(new_value); 656 const char* value; 657 char* free_this_too = NULL; 658 if (old_len == 0) { 659 value = new_value; 660 } else if (new_len == 0) { 661 value = old_value; 662 } else { 663 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 664 // each new setting adds another LINE to the switch: 665 sprintf(buf, "%s\n%s", old_value, new_value); 666 value = buf; 667 free_this_too = buf; 668 } 669 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 670 // CommandLineFlags always returns a pointer that needs freeing. 671 FREE_C_HEAP_ARRAY(char, value, mtInternal); 672 if (free_this_too != NULL) { 673 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 674 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 675 } 676 return true; 677} 678 679bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) { 680 681 // range of acceptable characters spelled out for portability reasons 682#define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 683#define BUFLEN 255 684 char name[BUFLEN+1]; 685 char dummy; 686 687 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 688 return set_bool_flag(name, false, origin); 689 } 690 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 691 return set_bool_flag(name, true, origin); 692 } 693 694 char punct; 695 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 696 const char* value = strchr(arg, '=') + 1; 697 Flag* flag = Flag::find_flag(name, strlen(name)); 698 if (flag != NULL && flag->is_ccstr()) { 699 if (flag->ccstr_accumulates()) { 700 return append_to_string_flag(name, value, origin); 701 } else { 702 if (value[0] == '\0') { 703 value = NULL; 704 } 705 return set_string_flag(name, value, origin); 706 } 707 } 708 } 709 710 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 711 const char* value = strchr(arg, '=') + 1; 712 // -XX:Foo:=xxx will reset the string flag to the given value. 713 if (value[0] == '\0') { 714 value = NULL; 715 } 716 return set_string_flag(name, value, origin); 717 } 718 719#define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 720#define SIGNED_NUMBER_RANGE "[-0123456789]" 721#define NUMBER_RANGE "[0123456789]" 722 char value[BUFLEN + 1]; 723 char value2[BUFLEN + 1]; 724 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 725 // Looks like a floating-point number -- try again with more lenient format string 726 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 727 return set_fp_numeric_flag(name, value, origin); 728 } 729 } 730 731#define VALUE_RANGE "[-kmgtKMGT0123456789]" 732 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 733 return set_numeric_flag(name, value, origin); 734 } 735 736 return false; 737} 738 739void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 740 assert(bldarray != NULL, "illegal argument"); 741 742 if (arg == NULL) { 743 return; 744 } 745 746 int index = *count; 747 748 // expand the array and add arg to the last element 749 (*count)++; 750 if (*bldarray == NULL) { 751 *bldarray = NEW_C_HEAP_ARRAY(char*, *count, mtInternal); 752 } else { 753 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count, mtInternal); 754 } 755 (*bldarray)[index] = strdup(arg); 756} 757 758void Arguments::build_jvm_args(const char* arg) { 759 add_string(&_jvm_args_array, &_num_jvm_args, arg); 760} 761 762void Arguments::build_jvm_flags(const char* arg) { 763 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 764} 765 766// utility function to return a string that concatenates all 767// strings in a given char** array 768const char* Arguments::build_resource_string(char** args, int count) { 769 if (args == NULL || count == 0) { 770 return NULL; 771 } 772 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 773 for (int i = 1; i < count; i++) { 774 length += strlen(args[i]) + 1; // add 1 for a space 775 } 776 char* s = NEW_RESOURCE_ARRAY(char, length); 777 strcpy(s, args[0]); 778 for (int j = 1; j < count; j++) { 779 strcat(s, " "); 780 strcat(s, args[j]); 781 } 782 return (const char*) s; 783} 784 785void Arguments::print_on(outputStream* st) { 786 st->print_cr("VM Arguments:"); 787 if (num_jvm_flags() > 0) { 788 st->print("jvm_flags: "); print_jvm_flags_on(st); 789 } 790 if (num_jvm_args() > 0) { 791 st->print("jvm_args: "); print_jvm_args_on(st); 792 } 793 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 794 st->print_cr("Launcher Type: %s", _sun_java_launcher); 795} 796 797void Arguments::print_jvm_flags_on(outputStream* st) { 798 if (_num_jvm_flags > 0) { 799 for (int i=0; i < _num_jvm_flags; i++) { 800 st->print("%s ", _jvm_flags_array[i]); 801 } 802 st->print_cr(""); 803 } 804} 805 806void Arguments::print_jvm_args_on(outputStream* st) { 807 if (_num_jvm_args > 0) { 808 for (int i=0; i < _num_jvm_args; i++) { 809 st->print("%s ", _jvm_args_array[i]); 810 } 811 st->print_cr(""); 812 } 813} 814 815bool Arguments::process_argument(const char* arg, 816 jboolean ignore_unrecognized, FlagValueOrigin origin) { 817 818 JDK_Version since = JDK_Version(); 819 820 if (parse_argument(arg, origin) || ignore_unrecognized) { 821 return true; 822 } 823 824 const char * const argname = *arg == '+' || *arg == '-' ? arg + 1 : arg; 825 if (is_newly_obsolete(arg, &since)) { 826 char version[256]; 827 since.to_string(version, sizeof(version)); 828 warning("ignoring option %s; support was removed in %s", argname, version); 829 return true; 830 } 831 832 // For locked flags, report a custom error message if available. 833 // Otherwise, report the standard unrecognized VM option. 834 835 Flag* locked_flag = Flag::find_flag((char*)argname, strlen(argname), true); 836 if (locked_flag != NULL) { 837 char locked_message_buf[BUFLEN]; 838 locked_flag->get_locked_message(locked_message_buf, BUFLEN); 839 if (strlen(locked_message_buf) == 0) { 840 jio_fprintf(defaultStream::error_stream(), 841 "Unrecognized VM option '%s'\n", argname); 842 } else { 843 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 844 } 845 } else { 846 jio_fprintf(defaultStream::error_stream(), 847 "Unrecognized VM option '%s'\n", argname); 848 } 849 850 // allow for commandline "commenting out" options like -XX:#+Verbose 851 return arg[0] == '#'; 852} 853 854bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 855 FILE* stream = fopen(file_name, "rb"); 856 if (stream == NULL) { 857 if (should_exist) { 858 jio_fprintf(defaultStream::error_stream(), 859 "Could not open settings file %s\n", file_name); 860 return false; 861 } else { 862 return true; 863 } 864 } 865 866 char token[1024]; 867 int pos = 0; 868 869 bool in_white_space = true; 870 bool in_comment = false; 871 bool in_quote = false; 872 char quote_c = 0; 873 bool result = true; 874 875 int c = getc(stream); 876 while(c != EOF) { 877 if (in_white_space) { 878 if (in_comment) { 879 if (c == '\n') in_comment = false; 880 } else { 881 if (c == '#') in_comment = true; 882 else if (!isspace(c)) { 883 in_white_space = false; 884 token[pos++] = c; 885 } 886 } 887 } else { 888 if (c == '\n' || (!in_quote && isspace(c))) { 889 // token ends at newline, or at unquoted whitespace 890 // this allows a way to include spaces in string-valued options 891 token[pos] = '\0'; 892 logOption(token); 893 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 894 build_jvm_flags(token); 895 pos = 0; 896 in_white_space = true; 897 in_quote = false; 898 } else if (!in_quote && (c == '\'' || c == '"')) { 899 in_quote = true; 900 quote_c = c; 901 } else if (in_quote && (c == quote_c)) { 902 in_quote = false; 903 } else { 904 token[pos++] = c; 905 } 906 } 907 c = getc(stream); 908 } 909 if (pos > 0) { 910 token[pos] = '\0'; 911 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 912 build_jvm_flags(token); 913 } 914 fclose(stream); 915 return result; 916} 917 918//============================================================================================================= 919// Parsing of properties (-D) 920 921const char* Arguments::get_property(const char* key) { 922 return PropertyList_get_value(system_properties(), key); 923} 924 925bool Arguments::add_property(const char* prop) { 926 const char* eq = strchr(prop, '='); 927 char* key; 928 // ns must be static--its address may be stored in a SystemProperty object. 929 const static char ns[1] = {0}; 930 char* value = (char *)ns; 931 932 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 933 key = AllocateHeap(key_len + 1, mtInternal); 934 strncpy(key, prop, key_len); 935 key[key_len] = '\0'; 936 937 if (eq != NULL) { 938 size_t value_len = strlen(prop) - key_len - 1; 939 value = AllocateHeap(value_len + 1, mtInternal); 940 strncpy(value, &prop[key_len + 1], value_len + 1); 941 } 942 943 if (strcmp(key, "java.compiler") == 0) { 944 process_java_compiler_argument(value); 945 FreeHeap(key); 946 if (eq != NULL) { 947 FreeHeap(value); 948 } 949 return true; 950 } else if (strcmp(key, "sun.java.command") == 0) { 951 _java_command = value; 952 953 // Record value in Arguments, but let it get passed to Java. 954 } else if (strcmp(key, "sun.java.launcher.pid") == 0) { 955 // launcher.pid property is private and is processed 956 // in process_sun_java_launcher_properties(); 957 // the sun.java.launcher property is passed on to the java application 958 FreeHeap(key); 959 if (eq != NULL) { 960 FreeHeap(value); 961 } 962 return true; 963 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 964 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 965 // its value without going through the property list or making a Java call. 966 _java_vendor_url_bug = value; 967 } else if (strcmp(key, "sun.boot.library.path") == 0) { 968 PropertyList_unique_add(&_system_properties, key, value, true); 969 return true; 970 } 971 // Create new property and add at the end of the list 972 PropertyList_unique_add(&_system_properties, key, value); 973 return true; 974} 975 976//=========================================================================================================== 977// Setting int/mixed/comp mode flags 978 979void Arguments::set_mode_flags(Mode mode) { 980 // Set up default values for all flags. 981 // If you add a flag to any of the branches below, 982 // add a default value for it here. 983 set_java_compiler(false); 984 _mode = mode; 985 986 // Ensure Agent_OnLoad has the correct initial values. 987 // This may not be the final mode; mode may change later in onload phase. 988 PropertyList_unique_add(&_system_properties, "java.vm.info", 989 (char*)VM_Version::vm_info_string(), false); 990 991 UseInterpreter = true; 992 UseCompiler = true; 993 UseLoopCounter = true; 994 995#ifndef ZERO 996 // Turn these off for mixed and comp. Leave them on for Zero. 997 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) { 998 UseFastAccessorMethods = (mode == _int); 999 } 1000 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) { 1001 UseFastEmptyMethods = (mode == _int); 1002 } 1003#endif 1004 1005 // Default values may be platform/compiler dependent - 1006 // use the saved values 1007 ClipInlining = Arguments::_ClipInlining; 1008 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1009 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1010 BackgroundCompilation = Arguments::_BackgroundCompilation; 1011 1012 // Change from defaults based on mode 1013 switch (mode) { 1014 default: 1015 ShouldNotReachHere(); 1016 break; 1017 case _int: 1018 UseCompiler = false; 1019 UseLoopCounter = false; 1020 AlwaysCompileLoopMethods = false; 1021 UseOnStackReplacement = false; 1022 break; 1023 case _mixed: 1024 // same as default 1025 break; 1026 case _comp: 1027 UseInterpreter = false; 1028 BackgroundCompilation = false; 1029 ClipInlining = false; 1030 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1031 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1032 // compile a level 4 (C2) and then continue executing it. 1033 if (TieredCompilation) { 1034 Tier3InvokeNotifyFreqLog = 0; 1035 Tier4InvocationThreshold = 0; 1036 } 1037 break; 1038 } 1039} 1040 1041// Conflict: required to use shared spaces (-Xshare:on), but 1042// incompatible command line options were chosen. 1043 1044static void no_shared_spaces() { 1045 if (RequireSharedSpaces) { 1046 jio_fprintf(defaultStream::error_stream(), 1047 "Class data sharing is inconsistent with other specified options.\n"); 1048 vm_exit_during_initialization("Unable to use shared archive.", NULL); 1049 } else { 1050 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1051 } 1052} 1053 1054void Arguments::set_tiered_flags() { 1055 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1056 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1057 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1058 } 1059 if (CompilationPolicyChoice < 2) { 1060 vm_exit_during_initialization( 1061 "Incompatible compilation policy selected", NULL); 1062 } 1063 // Increase the code cache size - tiered compiles a lot more. 1064 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1065 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2); 1066 } 1067} 1068 1069#ifndef KERNEL 1070static void disable_adaptive_size_policy(const char* collector_name) { 1071 if (UseAdaptiveSizePolicy) { 1072 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1073 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1074 collector_name); 1075 } 1076 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1077 } 1078} 1079 1080// If the user has chosen ParallelGCThreads > 0, we set UseParNewGC 1081// if it's not explictly set or unset. If the user has chosen 1082// UseParNewGC and not explicitly set ParallelGCThreads we 1083// set it, unless this is a single cpu machine. 1084void Arguments::set_parnew_gc_flags() { 1085 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1086 "control point invariant"); 1087 assert(UseParNewGC, "Error"); 1088 1089 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1090 disable_adaptive_size_policy("UseParNewGC"); 1091 1092 if (ParallelGCThreads == 0) { 1093 FLAG_SET_DEFAULT(ParallelGCThreads, 1094 Abstract_VM_Version::parallel_worker_threads()); 1095 if (ParallelGCThreads == 1) { 1096 FLAG_SET_DEFAULT(UseParNewGC, false); 1097 FLAG_SET_DEFAULT(ParallelGCThreads, 0); 1098 } 1099 } 1100 if (UseParNewGC) { 1101 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1102 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1103 // we set them to 1024 and 1024. 1104 // See CR 6362902. 1105 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1106 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1107 } 1108 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1109 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1110 } 1111 1112 // AlwaysTenure flag should make ParNew promote all at first collection. 1113 // See CR 6362902. 1114 if (AlwaysTenure) { 1115 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 1116 } 1117 // When using compressed oops, we use local overflow stacks, 1118 // rather than using a global overflow list chained through 1119 // the klass word of the object's pre-image. 1120 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1121 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1122 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1123 } 1124 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1125 } 1126 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1127 } 1128} 1129 1130// Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1131// sparc/solaris for certain applications, but would gain from 1132// further optimization and tuning efforts, and would almost 1133// certainly gain from analysis of platform and environment. 1134void Arguments::set_cms_and_parnew_gc_flags() { 1135 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1136 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1137 1138 // If we are using CMS, we prefer to UseParNewGC, 1139 // unless explicitly forbidden. 1140 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1141 FLAG_SET_ERGO(bool, UseParNewGC, true); 1142 } 1143 1144 // Turn off AdaptiveSizePolicy for CMS until it is complete. 1145 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1146 1147 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1148 // as needed. 1149 if (UseParNewGC) { 1150 set_parnew_gc_flags(); 1151 } 1152 1153 // MaxHeapSize is aligned down in collectorPolicy 1154 size_t max_heap = align_size_down(MaxHeapSize, 1155 CardTableRS::ct_max_alignment_constraint()); 1156 1157 // Now make adjustments for CMS 1158 intx tenuring_default = (intx)6; 1159 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1160 1161 // Preferred young gen size for "short" pauses: 1162 // upper bound depends on # of threads and NewRatio. 1163 const uintx parallel_gc_threads = 1164 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1165 const size_t preferred_max_new_size_unaligned = 1166 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1167 size_t preferred_max_new_size = 1168 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1169 1170 // Unless explicitly requested otherwise, size young gen 1171 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1172 1173 // If either MaxNewSize or NewRatio is set on the command line, 1174 // assume the user is trying to set the size of the young gen. 1175 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1176 1177 // Set MaxNewSize to our calculated preferred_max_new_size unless 1178 // NewSize was set on the command line and it is larger than 1179 // preferred_max_new_size. 1180 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1181 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1182 } else { 1183 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1184 } 1185 if (PrintGCDetails && Verbose) { 1186 // Too early to use gclog_or_tty 1187 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1188 } 1189 1190 // Code along this path potentially sets NewSize and OldSize 1191 1192 assert(max_heap >= InitialHeapSize, "Error"); 1193 assert(max_heap >= NewSize, "Error"); 1194 1195 if (PrintGCDetails && Verbose) { 1196 // Too early to use gclog_or_tty 1197 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1198 " initial_heap_size: " SIZE_FORMAT 1199 " max_heap: " SIZE_FORMAT, 1200 min_heap_size(), InitialHeapSize, max_heap); 1201 } 1202 size_t min_new = preferred_max_new_size; 1203 if (FLAG_IS_CMDLINE(NewSize)) { 1204 min_new = NewSize; 1205 } 1206 if (max_heap > min_new && min_heap_size() > min_new) { 1207 // Unless explicitly requested otherwise, make young gen 1208 // at least min_new, and at most preferred_max_new_size. 1209 if (FLAG_IS_DEFAULT(NewSize)) { 1210 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1211 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1212 if (PrintGCDetails && Verbose) { 1213 // Too early to use gclog_or_tty 1214 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1215 } 1216 } 1217 // Unless explicitly requested otherwise, size old gen 1218 // so it's NewRatio x of NewSize. 1219 if (FLAG_IS_DEFAULT(OldSize)) { 1220 if (max_heap > NewSize) { 1221 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1222 if (PrintGCDetails && Verbose) { 1223 // Too early to use gclog_or_tty 1224 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1225 } 1226 } 1227 } 1228 } 1229 } 1230 // Unless explicitly requested otherwise, definitely 1231 // promote all objects surviving "tenuring_default" scavenges. 1232 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1233 FLAG_IS_DEFAULT(SurvivorRatio)) { 1234 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1235 } 1236 // If we decided above (or user explicitly requested) 1237 // `promote all' (via MaxTenuringThreshold := 0), 1238 // prefer minuscule survivor spaces so as not to waste 1239 // space for (non-existent) survivors 1240 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1241 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio)); 1242 } 1243 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1244 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1245 // This is done in order to make ParNew+CMS configuration to work 1246 // with YoungPLABSize and OldPLABSize options. 1247 // See CR 6362902. 1248 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1249 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1250 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1251 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1252 // the value (either from the command line or ergonomics) of 1253 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1254 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1255 } else { 1256 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1257 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1258 // we'll let it to take precedence. 1259 jio_fprintf(defaultStream::error_stream(), 1260 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1261 " options are specified for the CMS collector." 1262 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1263 } 1264 } 1265 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1266 // OldPLAB sizing manually turned off: Use a larger default setting, 1267 // unless it was manually specified. This is because a too-low value 1268 // will slow down scavenges. 1269 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1270 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1271 } 1272 } 1273 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1274 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1275 // If either of the static initialization defaults have changed, note this 1276 // modification. 1277 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1278 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1279 } 1280 if (PrintGCDetails && Verbose) { 1281 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1282 MarkStackSize / K, MarkStackSizeMax / K); 1283 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1284 } 1285} 1286#endif // KERNEL 1287 1288void set_object_alignment() { 1289 // Object alignment. 1290 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1291 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1292 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1293 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1294 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1295 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1296 1297 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1298 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1299 1300 // Oop encoding heap max 1301 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1302 1303#ifndef KERNEL 1304 // Set CMS global values 1305 CompactibleFreeListSpace::set_cms_values(); 1306#endif // KERNEL 1307} 1308 1309bool verify_object_alignment() { 1310 // Object alignment. 1311 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1312 jio_fprintf(defaultStream::error_stream(), 1313 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1314 (int)ObjectAlignmentInBytes); 1315 return false; 1316 } 1317 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1318 jio_fprintf(defaultStream::error_stream(), 1319 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1320 (int)ObjectAlignmentInBytes, BytesPerLong); 1321 return false; 1322 } 1323 // It does not make sense to have big object alignment 1324 // since a space lost due to alignment will be greater 1325 // then a saved space from compressed oops. 1326 if ((int)ObjectAlignmentInBytes > 256) { 1327 jio_fprintf(defaultStream::error_stream(), 1328 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n", 1329 (int)ObjectAlignmentInBytes); 1330 return false; 1331 } 1332 // In case page size is very small. 1333 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1334 jio_fprintf(defaultStream::error_stream(), 1335 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n", 1336 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1337 return false; 1338 } 1339 return true; 1340} 1341 1342inline uintx max_heap_for_compressed_oops() { 1343 // Avoid sign flip. 1344 if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) { 1345 return 0; 1346 } 1347 LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size()); 1348 NOT_LP64(ShouldNotReachHere(); return 0); 1349} 1350 1351bool Arguments::should_auto_select_low_pause_collector() { 1352 if (UseAutoGCSelectPolicy && 1353 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1354 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1355 if (PrintGCDetails) { 1356 // Cannot use gclog_or_tty yet. 1357 tty->print_cr("Automatic selection of the low pause collector" 1358 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1359 } 1360 return true; 1361 } 1362 return false; 1363} 1364 1365void Arguments::set_ergonomics_flags() { 1366 1367 if (os::is_server_class_machine()) { 1368 // If no other collector is requested explicitly, 1369 // let the VM select the collector based on 1370 // machine class and automatic selection policy. 1371 if (!UseSerialGC && 1372 !UseConcMarkSweepGC && 1373 !UseG1GC && 1374 !UseParNewGC && 1375 FLAG_IS_DEFAULT(UseParallelGC)) { 1376 if (should_auto_select_low_pause_collector()) { 1377 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1378 } else { 1379 FLAG_SET_ERGO(bool, UseParallelGC, true); 1380 } 1381 } 1382 // Shared spaces work fine with other GCs but causes bytecode rewriting 1383 // to be disabled, which hurts interpreter performance and decreases 1384 // server performance. On server class machines, keep the default 1385 // off unless it is asked for. Future work: either add bytecode rewriting 1386 // at link time, or rewrite bytecodes in non-shared methods. 1387 if (!DumpSharedSpaces && !RequireSharedSpaces) { 1388 no_shared_spaces(); 1389 } 1390 } 1391 1392#ifndef ZERO 1393#ifdef _LP64 1394 // Check that UseCompressedOops can be set with the max heap size allocated 1395 // by ergonomics. 1396 if (MaxHeapSize <= max_heap_for_compressed_oops()) { 1397#if !defined(COMPILER1) || defined(TIERED) 1398 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1399 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1400 } 1401#endif 1402#ifdef _WIN64 1403 if (UseLargePages && UseCompressedOops) { 1404 // Cannot allocate guard pages for implicit checks in indexed addressing 1405 // mode, when large pages are specified on windows. 1406 // This flag could be switched ON if narrow oop base address is set to 0, 1407 // see code in Universe::initialize_heap(). 1408 Universe::set_narrow_oop_use_implicit_null_checks(false); 1409 } 1410#endif // _WIN64 1411 } else { 1412 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1413 warning("Max heap size too large for Compressed Oops"); 1414 FLAG_SET_DEFAULT(UseCompressedOops, false); 1415 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1416 } 1417 } 1418 // UseCompressedOops must be on for UseCompressedKlassPointers to be on. 1419 if (!UseCompressedOops) { 1420 if (UseCompressedKlassPointers) { 1421 warning("UseCompressedKlassPointers requires UseCompressedOops"); 1422 } 1423 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1424 } else { 1425 // Turn on UseCompressedKlassPointers too 1426 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) { 1427 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true); 1428 } 1429 // Set the ClassMetaspaceSize to something that will not need to be 1430 // expanded, since it cannot be expanded. 1431 if (UseCompressedKlassPointers && FLAG_IS_DEFAULT(ClassMetaspaceSize)) { 1432 // 100,000 classes seems like a good size, so 100M assumes around 1K 1433 // per klass. The vtable and oopMap is embedded so we don't have a fixed 1434 // size per klass. Eventually, this will be parameterized because it 1435 // would also be useful to determine the optimal size of the 1436 // systemDictionary. 1437 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M); 1438 } 1439 } 1440 // Also checks that certain machines are slower with compressed oops 1441 // in vm_version initialization code. 1442#endif // _LP64 1443#endif // !ZERO 1444} 1445 1446void Arguments::set_parallel_gc_flags() { 1447 assert(UseParallelGC || UseParallelOldGC, "Error"); 1448 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1449 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1450 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1451 } 1452 FLAG_SET_DEFAULT(UseParallelGC, true); 1453 1454 // If no heap maximum was requested explicitly, use some reasonable fraction 1455 // of the physical memory, up to a maximum of 1GB. 1456 if (UseParallelGC) { 1457 FLAG_SET_DEFAULT(ParallelGCThreads, 1458 Abstract_VM_Version::parallel_worker_threads()); 1459 1460 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1461 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1462 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1463 // See CR 6362902 for details. 1464 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1465 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1466 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1467 } 1468 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1469 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1470 } 1471 } 1472 1473 if (UseParallelOldGC) { 1474 // Par compact uses lower default values since they are treated as 1475 // minimums. These are different defaults because of the different 1476 // interpretation and are not ergonomically set. 1477 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1478 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1479 } 1480 } 1481 } 1482 if (UseNUMA) { 1483 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 1484 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 1485 } 1486 // For those collectors or operating systems (eg, Windows) that do 1487 // not support full UseNUMA, we will map to UseNUMAInterleaving for now 1488 UseNUMAInterleaving = true; 1489 } 1490} 1491 1492void Arguments::set_g1_gc_flags() { 1493 assert(UseG1GC, "Error"); 1494#ifdef COMPILER1 1495 FastTLABRefill = false; 1496#endif 1497 FLAG_SET_DEFAULT(ParallelGCThreads, 1498 Abstract_VM_Version::parallel_worker_threads()); 1499 if (ParallelGCThreads == 0) { 1500 FLAG_SET_DEFAULT(ParallelGCThreads, 1501 Abstract_VM_Version::parallel_worker_threads()); 1502 } 1503 1504 if (FLAG_IS_DEFAULT(MarkStackSize)) { 1505 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE); 1506 } 1507 if (PrintGCDetails && Verbose) { 1508 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1509 MarkStackSize / K, MarkStackSizeMax / K); 1510 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1511 } 1512 1513 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1514 // In G1, we want the default GC overhead goal to be higher than 1515 // say in PS. So we set it here to 10%. Otherwise the heap might 1516 // be expanded more aggressively than we would like it to. In 1517 // fact, even 10% seems to not be high enough in some cases 1518 // (especially small GC stress tests that the main thing they do 1519 // is allocation). We might consider increase it further. 1520 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1521 } 1522} 1523 1524void Arguments::set_heap_size() { 1525 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1526 // Deprecated flag 1527 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1528 } 1529 1530 const julong phys_mem = 1531 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1532 : (julong)MaxRAM; 1533 1534 // If the maximum heap size has not been set with -Xmx, 1535 // then set it as fraction of the size of physical memory, 1536 // respecting the maximum and minimum sizes of the heap. 1537 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1538 julong reasonable_max = phys_mem / MaxRAMFraction; 1539 1540 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1541 // Small physical memory, so use a minimum fraction of it for the heap 1542 reasonable_max = phys_mem / MinRAMFraction; 1543 } else { 1544 // Not-small physical memory, so require a heap at least 1545 // as large as MaxHeapSize 1546 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1547 } 1548 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1549 // Limit the heap size to ErgoHeapSizeLimit 1550 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1551 } 1552 if (UseCompressedOops) { 1553 // Limit the heap size to the maximum possible when using compressed oops 1554 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1555 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1556 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1557 // but it should be not less than default MaxHeapSize. 1558 max_coop_heap -= HeapBaseMinAddress; 1559 } 1560 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1561 } 1562 reasonable_max = os::allocatable_physical_memory(reasonable_max); 1563 1564 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1565 // An initial heap size was specified on the command line, 1566 // so be sure that the maximum size is consistent. Done 1567 // after call to allocatable_physical_memory because that 1568 // method might reduce the allocation size. 1569 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1570 } 1571 1572 if (PrintGCDetails && Verbose) { 1573 // Cannot use gclog_or_tty yet. 1574 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1575 } 1576 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1577 } 1578 1579 // If the initial_heap_size has not been set with InitialHeapSize 1580 // or -Xms, then set it as fraction of the size of physical memory, 1581 // respecting the maximum and minimum sizes of the heap. 1582 if (FLAG_IS_DEFAULT(InitialHeapSize)) { 1583 julong reasonable_minimum = (julong)(OldSize + NewSize); 1584 1585 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1586 1587 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum); 1588 1589 julong reasonable_initial = phys_mem / InitialRAMFraction; 1590 1591 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum); 1592 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1593 1594 reasonable_initial = os::allocatable_physical_memory(reasonable_initial); 1595 1596 if (PrintGCDetails && Verbose) { 1597 // Cannot use gclog_or_tty yet. 1598 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1599 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum); 1600 } 1601 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1602 set_min_heap_size((uintx)reasonable_minimum); 1603 } 1604} 1605 1606// This must be called after ergonomics because we want bytecode rewriting 1607// if the server compiler is used, or if UseSharedSpaces is disabled. 1608void Arguments::set_bytecode_flags() { 1609 // Better not attempt to store into a read-only space. 1610 if (UseSharedSpaces) { 1611 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1612 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1613 } 1614 1615 if (!RewriteBytecodes) { 1616 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1617 } 1618} 1619 1620// Aggressive optimization flags -XX:+AggressiveOpts 1621void Arguments::set_aggressive_opts_flags() { 1622#ifdef COMPILER2 1623 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1624 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1625 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1626 } 1627 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1628 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1629 } 1630 1631 // Feed the cache size setting into the JDK 1632 char buffer[1024]; 1633 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1634 add_property(buffer); 1635 } 1636 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1637 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1638 } 1639#endif 1640 1641 if (AggressiveOpts) { 1642// Sample flag setting code 1643// if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1644// FLAG_SET_DEFAULT(EliminateZeroing, true); 1645// } 1646 } 1647} 1648 1649//=========================================================================================================== 1650// Parsing of java.compiler property 1651 1652void Arguments::process_java_compiler_argument(char* arg) { 1653 // For backwards compatibility, Djava.compiler=NONE or "" 1654 // causes us to switch to -Xint mode UNLESS -Xdebug 1655 // is also specified. 1656 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1657 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1658 } 1659} 1660 1661void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1662 _sun_java_launcher = strdup(launcher); 1663 if (strcmp("gamma", _sun_java_launcher) == 0) { 1664 _created_by_gamma_launcher = true; 1665 } 1666} 1667 1668bool Arguments::created_by_java_launcher() { 1669 assert(_sun_java_launcher != NULL, "property must have value"); 1670 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1671} 1672 1673bool Arguments::created_by_gamma_launcher() { 1674 return _created_by_gamma_launcher; 1675} 1676 1677//=========================================================================================================== 1678// Parsing of main arguments 1679 1680bool Arguments::verify_interval(uintx val, uintx min, 1681 uintx max, const char* name) { 1682 // Returns true iff value is in the inclusive interval [min..max] 1683 // false, otherwise. 1684 if (val >= min && val <= max) { 1685 return true; 1686 } 1687 jio_fprintf(defaultStream::error_stream(), 1688 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1689 " and " UINTX_FORMAT "\n", 1690 name, val, min, max); 1691 return false; 1692} 1693 1694bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1695 // Returns true if given value is at least specified min threshold 1696 // false, otherwise. 1697 if (val >= min ) { 1698 return true; 1699 } 1700 jio_fprintf(defaultStream::error_stream(), 1701 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1702 name, val, min); 1703 return false; 1704} 1705 1706bool Arguments::verify_percentage(uintx value, const char* name) { 1707 if (value <= 100) { 1708 return true; 1709 } 1710 jio_fprintf(defaultStream::error_stream(), 1711 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1712 name, value); 1713 return false; 1714} 1715 1716static void force_serial_gc() { 1717 FLAG_SET_DEFAULT(UseSerialGC, true); 1718 FLAG_SET_DEFAULT(UseParNewGC, false); 1719 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false); 1720 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 1721 FLAG_SET_DEFAULT(UseParallelGC, false); 1722 FLAG_SET_DEFAULT(UseParallelOldGC, false); 1723 FLAG_SET_DEFAULT(UseG1GC, false); 1724} 1725 1726static bool verify_serial_gc_flags() { 1727 return (UseSerialGC && 1728 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1729 UseParallelGC || UseParallelOldGC)); 1730} 1731 1732// check if do gclog rotation 1733// +UseGCLogFileRotation is a must, 1734// no gc log rotation when log file not supplied or 1735// NumberOfGCLogFiles is 0, or GCLogFileSize is 0 1736void check_gclog_consistency() { 1737 if (UseGCLogFileRotation) { 1738 if ((Arguments::gc_log_filename() == NULL) || 1739 (NumberOfGCLogFiles == 0) || 1740 (GCLogFileSize == 0)) { 1741 jio_fprintf(defaultStream::output_stream(), 1742 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n" 1743 "where num_of_file > 0 and num_of_size > 0\n" 1744 "GC log rotation is turned off\n"); 1745 UseGCLogFileRotation = false; 1746 } 1747 } 1748 1749 if (UseGCLogFileRotation && GCLogFileSize < 8*K) { 1750 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1751 jio_fprintf(defaultStream::output_stream(), 1752 "GCLogFileSize changed to minimum 8K\n"); 1753 } 1754} 1755 1756// Check consistency of GC selection 1757bool Arguments::check_gc_consistency() { 1758 check_gclog_consistency(); 1759 bool status = true; 1760 // Ensure that the user has not selected conflicting sets 1761 // of collectors. [Note: this check is merely a user convenience; 1762 // collectors over-ride each other so that only a non-conflicting 1763 // set is selected; however what the user gets is not what they 1764 // may have expected from the combination they asked for. It's 1765 // better to reduce user confusion by not allowing them to 1766 // select conflicting combinations. 1767 uint i = 0; 1768 if (UseSerialGC) i++; 1769 if (UseConcMarkSweepGC || UseParNewGC) i++; 1770 if (UseParallelGC || UseParallelOldGC) i++; 1771 if (UseG1GC) i++; 1772 if (i > 1) { 1773 jio_fprintf(defaultStream::error_stream(), 1774 "Conflicting collector combinations in option list; " 1775 "please refer to the release notes for the combinations " 1776 "allowed\n"); 1777 status = false; 1778 } 1779 1780 return status; 1781} 1782 1783// Check stack pages settings 1784bool Arguments::check_stack_pages() 1785{ 1786 bool status = true; 1787 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 1788 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 1789 // greater stack shadow pages can't generate instruction to bang stack 1790 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 1791 return status; 1792} 1793 1794// Check the consistency of vm_init_args 1795bool Arguments::check_vm_args_consistency() { 1796 // Method for adding checks for flag consistency. 1797 // The intent is to warn the user of all possible conflicts, 1798 // before returning an error. 1799 // Note: Needs platform-dependent factoring. 1800 bool status = true; 1801 1802#if ( (defined(COMPILER2) && defined(SPARC))) 1803 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init 1804 // on sparc doesn't require generation of a stub as is the case on, e.g., 1805 // x86. Normally, VM_Version_init must be called from init_globals in 1806 // init.cpp, which is called by the initial java thread *after* arguments 1807 // have been parsed. VM_Version_init gets called twice on sparc. 1808 extern void VM_Version_init(); 1809 VM_Version_init(); 1810 if (!VM_Version::has_v9()) { 1811 jio_fprintf(defaultStream::error_stream(), 1812 "V8 Machine detected, Server requires V9\n"); 1813 status = false; 1814 } 1815#endif /* COMPILER2 && SPARC */ 1816 1817 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 1818 // builds so the cost of stack banging can be measured. 1819#if (defined(PRODUCT) && defined(SOLARIS)) 1820 if (!UseBoundThreads && !UseStackBanging) { 1821 jio_fprintf(defaultStream::error_stream(), 1822 "-UseStackBanging conflicts with -UseBoundThreads\n"); 1823 1824 status = false; 1825 } 1826#endif 1827 1828 if (TLABRefillWasteFraction == 0) { 1829 jio_fprintf(defaultStream::error_stream(), 1830 "TLABRefillWasteFraction should be a denominator, " 1831 "not " SIZE_FORMAT "\n", 1832 TLABRefillWasteFraction); 1833 status = false; 1834 } 1835 1836 status = status && verify_percentage(AdaptiveSizePolicyWeight, 1837 "AdaptiveSizePolicyWeight"); 1838 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 1839 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 1840 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 1841 1842 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 1843 jio_fprintf(defaultStream::error_stream(), 1844 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1845 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 1846 MinHeapFreeRatio, MaxHeapFreeRatio); 1847 status = false; 1848 } 1849 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1850 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 1851 1852 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 1853 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 1854 } 1855 1856 if (UseParallelOldGC && ParallelOldGCSplitALot) { 1857 // Settings to encourage splitting. 1858 if (!FLAG_IS_CMDLINE(NewRatio)) { 1859 FLAG_SET_CMDLINE(intx, NewRatio, 2); 1860 } 1861 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 1862 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 1863 } 1864 } 1865 1866 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1867 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 1868 if (GCTimeLimit == 100) { 1869 // Turn off gc-overhead-limit-exceeded checks 1870 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 1871 } 1872 1873 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1874 1875 status = status && check_gc_consistency(); 1876 status = status && check_stack_pages(); 1877 1878 if (_has_alloc_profile) { 1879 if (UseParallelGC || UseParallelOldGC) { 1880 jio_fprintf(defaultStream::error_stream(), 1881 "error: invalid argument combination.\n" 1882 "Allocation profiling (-Xaprof) cannot be used together with " 1883 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n"); 1884 status = false; 1885 } 1886 if (UseConcMarkSweepGC) { 1887 jio_fprintf(defaultStream::error_stream(), 1888 "error: invalid argument combination.\n" 1889 "Allocation profiling (-Xaprof) cannot be used together with " 1890 "the CMS collector (-XX:+UseConcMarkSweepGC).\n"); 1891 status = false; 1892 } 1893 } 1894 1895 if (CMSIncrementalMode) { 1896 if (!UseConcMarkSweepGC) { 1897 jio_fprintf(defaultStream::error_stream(), 1898 "error: invalid argument combination.\n" 1899 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 1900 "selected in order\nto use CMSIncrementalMode.\n"); 1901 status = false; 1902 } else { 1903 status = status && verify_percentage(CMSIncrementalDutyCycle, 1904 "CMSIncrementalDutyCycle"); 1905 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 1906 "CMSIncrementalDutyCycleMin"); 1907 status = status && verify_percentage(CMSIncrementalSafetyFactor, 1908 "CMSIncrementalSafetyFactor"); 1909 status = status && verify_percentage(CMSIncrementalOffset, 1910 "CMSIncrementalOffset"); 1911 status = status && verify_percentage(CMSExpAvgFactor, 1912 "CMSExpAvgFactor"); 1913 // If it was not set on the command line, set 1914 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 1915 if (CMSInitiatingOccupancyFraction < 0) { 1916 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 1917 } 1918 } 1919 } 1920 1921 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 1922 // insists that we hold the requisite locks so that the iteration is 1923 // MT-safe. For the verification at start-up and shut-down, we don't 1924 // yet have a good way of acquiring and releasing these locks, 1925 // which are not visible at the CollectedHeap level. We want to 1926 // be able to acquire these locks and then do the iteration rather 1927 // than just disable the lock verification. This will be fixed under 1928 // bug 4788986. 1929 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 1930 if (VerifyGCStartAt == 0) { 1931 warning("Heap verification at start-up disabled " 1932 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1933 VerifyGCStartAt = 1; // Disable verification at start-up 1934 } 1935 if (VerifyBeforeExit) { 1936 warning("Heap verification at shutdown disabled " 1937 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1938 VerifyBeforeExit = false; // Disable verification at shutdown 1939 } 1940 } 1941 1942 // Note: only executed in non-PRODUCT mode 1943 if (!UseAsyncConcMarkSweepGC && 1944 (ExplicitGCInvokesConcurrent || 1945 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 1946 jio_fprintf(defaultStream::error_stream(), 1947 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 1948 " with -UseAsyncConcMarkSweepGC"); 1949 status = false; 1950 } 1951 1952 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 1953 1954#ifndef SERIALGC 1955 if (UseG1GC) { 1956 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 1957 "InitiatingHeapOccupancyPercent"); 1958 status = status && verify_min_value(G1RefProcDrainInterval, 1, 1959 "G1RefProcDrainInterval"); 1960 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 1961 "G1ConcMarkStepDurationMillis"); 1962 } 1963#endif 1964 1965 status = status && verify_interval(RefDiscoveryPolicy, 1966 ReferenceProcessor::DiscoveryPolicyMin, 1967 ReferenceProcessor::DiscoveryPolicyMax, 1968 "RefDiscoveryPolicy"); 1969 1970 // Limit the lower bound of this flag to 1 as it is used in a division 1971 // expression. 1972 status = status && verify_interval(TLABWasteTargetPercent, 1973 1, 100, "TLABWasteTargetPercent"); 1974 1975 status = status && verify_object_alignment(); 1976 1977 status = status && verify_min_value(ClassMetaspaceSize, 1*M, 1978 "ClassMetaspaceSize"); 1979 1980#ifdef SPARC 1981 if (UseConcMarkSweepGC || UseG1GC) { 1982 // Issue a stern warning if the user has explicitly set 1983 // UseMemSetInBOT (it is known to cause issues), but allow 1984 // use for experimentation and debugging. 1985 if (VM_Version::is_sun4v() && UseMemSetInBOT) { 1986 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error"); 1987 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability" 1988 " on sun4v; please understand that you are using at your own risk!"); 1989 } 1990 } 1991#endif // SPARC 1992 1993 if (PrintNMTStatistics && MemTracker::tracking_level() == MemTracker::NMT_off) { 1994 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 1995 PrintNMTStatistics = false; 1996 } 1997 1998 return status; 1999} 2000 2001bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2002 const char* option_type) { 2003 if (ignore) return false; 2004 2005 const char* spacer = " "; 2006 if (option_type == NULL) { 2007 option_type = ++spacer; // Set both to the empty string. 2008 } 2009 2010 if (os::obsolete_option(option)) { 2011 jio_fprintf(defaultStream::error_stream(), 2012 "Obsolete %s%soption: %s\n", option_type, spacer, 2013 option->optionString); 2014 return false; 2015 } else { 2016 jio_fprintf(defaultStream::error_stream(), 2017 "Unrecognized %s%soption: %s\n", option_type, spacer, 2018 option->optionString); 2019 return true; 2020 } 2021} 2022 2023static const char* user_assertion_options[] = { 2024 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2025}; 2026 2027static const char* system_assertion_options[] = { 2028 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2029}; 2030 2031// Return true if any of the strings in null-terminated array 'names' matches. 2032// If tail_allowed is true, then the tail must begin with a colon; otherwise, 2033// the option must match exactly. 2034static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2035 bool tail_allowed) { 2036 for (/* empty */; *names != NULL; ++names) { 2037 if (match_option(option, *names, tail)) { 2038 if (**tail == '\0' || tail_allowed && **tail == ':') { 2039 return true; 2040 } 2041 } 2042 } 2043 return false; 2044} 2045 2046bool Arguments::parse_uintx(const char* value, 2047 uintx* uintx_arg, 2048 uintx min_size) { 2049 2050 // Check the sign first since atomull() parses only unsigned values. 2051 bool value_is_positive = !(*value == '-'); 2052 2053 if (value_is_positive) { 2054 julong n; 2055 bool good_return = atomull(value, &n); 2056 if (good_return) { 2057 bool above_minimum = n >= min_size; 2058 bool value_is_too_large = n > max_uintx; 2059 2060 if (above_minimum && !value_is_too_large) { 2061 *uintx_arg = n; 2062 return true; 2063 } 2064 } 2065 } 2066 return false; 2067} 2068 2069Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2070 julong* long_arg, 2071 julong min_size) { 2072 if (!atomull(s, long_arg)) return arg_unreadable; 2073 return check_memory_size(*long_arg, min_size); 2074} 2075 2076// Parse JavaVMInitArgs structure 2077 2078jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2079 // For components of the system classpath. 2080 SysClassPath scp(Arguments::get_sysclasspath()); 2081 bool scp_assembly_required = false; 2082 2083 // Save default settings for some mode flags 2084 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2085 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2086 Arguments::_ClipInlining = ClipInlining; 2087 Arguments::_BackgroundCompilation = BackgroundCompilation; 2088 2089 // Setup flags for mixed which is the default 2090 set_mode_flags(_mixed); 2091 2092 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2093 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2094 if (result != JNI_OK) { 2095 return result; 2096 } 2097 2098 // Parse JavaVMInitArgs structure passed in 2099 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE); 2100 if (result != JNI_OK) { 2101 return result; 2102 } 2103 2104 if (AggressiveOpts) { 2105 // Insert alt-rt.jar between user-specified bootclasspath 2106 // prefix and the default bootclasspath. os::set_boot_path() 2107 // uses meta_index_dir as the default bootclasspath directory. 2108 const char* altclasses_jar = "alt-rt.jar"; 2109 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 + 2110 strlen(altclasses_jar); 2111 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal); 2112 strcpy(altclasses_path, get_meta_index_dir()); 2113 strcat(altclasses_path, altclasses_jar); 2114 scp.add_suffix_to_prefix(altclasses_path); 2115 scp_assembly_required = true; 2116 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal); 2117 } 2118 2119 if (WhiteBoxAPI) { 2120 // Append wb.jar to bootclasspath if enabled 2121 const char* wb_jar = "wb.jar"; 2122 size_t wb_path_len = strlen(get_meta_index_dir()) + 1 + 2123 strlen(wb_jar); 2124 char* wb_path = NEW_C_HEAP_ARRAY(char, wb_path_len, mtInternal); 2125 strcpy(wb_path, get_meta_index_dir()); 2126 strcat(wb_path, wb_jar); 2127 scp.add_suffix(wb_path); 2128 scp_assembly_required = true; 2129 FREE_C_HEAP_ARRAY(char, wb_path, mtInternal); 2130 } 2131 2132 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2133 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2134 if (result != JNI_OK) { 2135 return result; 2136 } 2137 2138 // Do final processing now that all arguments have been parsed 2139 result = finalize_vm_init_args(&scp, scp_assembly_required); 2140 if (result != JNI_OK) { 2141 return result; 2142 } 2143 2144 return JNI_OK; 2145} 2146 2147jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2148 SysClassPath* scp_p, 2149 bool* scp_assembly_required_p, 2150 FlagValueOrigin origin) { 2151 // Remaining part of option string 2152 const char* tail; 2153 2154 // iterate over arguments 2155 for (int index = 0; index < args->nOptions; index++) { 2156 bool is_absolute_path = false; // for -agentpath vs -agentlib 2157 2158 const JavaVMOption* option = args->options + index; 2159 2160 if (!match_option(option, "-Djava.class.path", &tail) && 2161 !match_option(option, "-Dsun.java.command", &tail) && 2162 !match_option(option, "-Dsun.java.launcher", &tail)) { 2163 2164 // add all jvm options to the jvm_args string. This string 2165 // is used later to set the java.vm.args PerfData string constant. 2166 // the -Djava.class.path and the -Dsun.java.command options are 2167 // omitted from jvm_args string as each have their own PerfData 2168 // string constant object. 2169 build_jvm_args(option->optionString); 2170 } 2171 2172 // -verbose:[class/gc/jni] 2173 if (match_option(option, "-verbose", &tail)) { 2174 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2175 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2176 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2177 } else if (!strcmp(tail, ":gc")) { 2178 FLAG_SET_CMDLINE(bool, PrintGC, true); 2179 } else if (!strcmp(tail, ":jni")) { 2180 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2181 } 2182 // -da / -ea / -disableassertions / -enableassertions 2183 // These accept an optional class/package name separated by a colon, e.g., 2184 // -da:java.lang.Thread. 2185 } else if (match_option(option, user_assertion_options, &tail, true)) { 2186 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2187 if (*tail == '\0') { 2188 JavaAssertions::setUserClassDefault(enable); 2189 } else { 2190 assert(*tail == ':', "bogus match by match_option()"); 2191 JavaAssertions::addOption(tail + 1, enable); 2192 } 2193 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2194 } else if (match_option(option, system_assertion_options, &tail, false)) { 2195 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2196 JavaAssertions::setSystemClassDefault(enable); 2197 // -bootclasspath: 2198 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2199 scp_p->reset_path(tail); 2200 *scp_assembly_required_p = true; 2201 // -bootclasspath/a: 2202 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2203 scp_p->add_suffix(tail); 2204 *scp_assembly_required_p = true; 2205 // -bootclasspath/p: 2206 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2207 scp_p->add_prefix(tail); 2208 *scp_assembly_required_p = true; 2209 // -Xrun 2210 } else if (match_option(option, "-Xrun", &tail)) { 2211 if (tail != NULL) { 2212 const char* pos = strchr(tail, ':'); 2213 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2214 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2215 name[len] = '\0'; 2216 2217 char *options = NULL; 2218 if(pos != NULL) { 2219 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2220 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2221 } 2222#ifdef JVMTI_KERNEL 2223 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2224 warning("profiling and debugging agents are not supported with Kernel VM"); 2225 } else 2226#endif // JVMTI_KERNEL 2227 add_init_library(name, options); 2228 } 2229 // -agentlib and -agentpath 2230 } else if (match_option(option, "-agentlib:", &tail) || 2231 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2232 if(tail != NULL) { 2233 const char* pos = strchr(tail, '='); 2234 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2235 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2236 name[len] = '\0'; 2237 2238 char *options = NULL; 2239 if(pos != NULL) { 2240 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2241 } 2242#ifdef JVMTI_KERNEL 2243 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2244 warning("profiling and debugging agents are not supported with Kernel VM"); 2245 } else 2246#endif // JVMTI_KERNEL 2247 add_init_agent(name, options, is_absolute_path); 2248 2249 } 2250 // -javaagent 2251 } else if (match_option(option, "-javaagent:", &tail)) { 2252 if(tail != NULL) { 2253 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2254 add_init_agent("instrument", options, false); 2255 } 2256 // -Xnoclassgc 2257 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2258 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2259 // -Xincgc: i-CMS 2260 } else if (match_option(option, "-Xincgc", &tail)) { 2261 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2262 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2263 // -Xnoincgc: no i-CMS 2264 } else if (match_option(option, "-Xnoincgc", &tail)) { 2265 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2266 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2267 // -Xconcgc 2268 } else if (match_option(option, "-Xconcgc", &tail)) { 2269 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2270 // -Xnoconcgc 2271 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2272 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2273 // -Xbatch 2274 } else if (match_option(option, "-Xbatch", &tail)) { 2275 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2276 // -Xmn for compatibility with other JVM vendors 2277 } else if (match_option(option, "-Xmn", &tail)) { 2278 julong long_initial_eden_size = 0; 2279 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1); 2280 if (errcode != arg_in_range) { 2281 jio_fprintf(defaultStream::error_stream(), 2282 "Invalid initial eden size: %s\n", option->optionString); 2283 describe_range_error(errcode); 2284 return JNI_EINVAL; 2285 } 2286 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size); 2287 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size); 2288 // -Xms 2289 } else if (match_option(option, "-Xms", &tail)) { 2290 julong long_initial_heap_size = 0; 2291 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1); 2292 if (errcode != arg_in_range) { 2293 jio_fprintf(defaultStream::error_stream(), 2294 "Invalid initial heap size: %s\n", option->optionString); 2295 describe_range_error(errcode); 2296 return JNI_EINVAL; 2297 } 2298 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2299 // Currently the minimum size and the initial heap sizes are the same. 2300 set_min_heap_size(InitialHeapSize); 2301 // -Xmx 2302 } else if (match_option(option, "-Xmx", &tail)) { 2303 julong long_max_heap_size = 0; 2304 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2305 if (errcode != arg_in_range) { 2306 jio_fprintf(defaultStream::error_stream(), 2307 "Invalid maximum heap size: %s\n", option->optionString); 2308 describe_range_error(errcode); 2309 return JNI_EINVAL; 2310 } 2311 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2312 // Xmaxf 2313 } else if (match_option(option, "-Xmaxf", &tail)) { 2314 int maxf = (int)(atof(tail) * 100); 2315 if (maxf < 0 || maxf > 100) { 2316 jio_fprintf(defaultStream::error_stream(), 2317 "Bad max heap free percentage size: %s\n", 2318 option->optionString); 2319 return JNI_EINVAL; 2320 } else { 2321 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2322 } 2323 // Xminf 2324 } else if (match_option(option, "-Xminf", &tail)) { 2325 int minf = (int)(atof(tail) * 100); 2326 if (minf < 0 || minf > 100) { 2327 jio_fprintf(defaultStream::error_stream(), 2328 "Bad min heap free percentage size: %s\n", 2329 option->optionString); 2330 return JNI_EINVAL; 2331 } else { 2332 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2333 } 2334 // -Xss 2335 } else if (match_option(option, "-Xss", &tail)) { 2336 julong long_ThreadStackSize = 0; 2337 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2338 if (errcode != arg_in_range) { 2339 jio_fprintf(defaultStream::error_stream(), 2340 "Invalid thread stack size: %s\n", option->optionString); 2341 describe_range_error(errcode); 2342 return JNI_EINVAL; 2343 } 2344 // Internally track ThreadStackSize in units of 1024 bytes. 2345 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2346 round_to((int)long_ThreadStackSize, K) / K); 2347 // -Xoss 2348 } else if (match_option(option, "-Xoss", &tail)) { 2349 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2350 // -Xmaxjitcodesize 2351 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2352 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2353 julong long_ReservedCodeCacheSize = 0; 2354 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 2355 (size_t)InitialCodeCacheSize); 2356 if (errcode != arg_in_range) { 2357 jio_fprintf(defaultStream::error_stream(), 2358 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n", 2359 option->optionString, InitialCodeCacheSize/K); 2360 describe_range_error(errcode); 2361 return JNI_EINVAL; 2362 } 2363 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2364 // -green 2365 } else if (match_option(option, "-green", &tail)) { 2366 jio_fprintf(defaultStream::error_stream(), 2367 "Green threads support not available\n"); 2368 return JNI_EINVAL; 2369 // -native 2370 } else if (match_option(option, "-native", &tail)) { 2371 // HotSpot always uses native threads, ignore silently for compatibility 2372 // -Xsqnopause 2373 } else if (match_option(option, "-Xsqnopause", &tail)) { 2374 // EVM option, ignore silently for compatibility 2375 // -Xrs 2376 } else if (match_option(option, "-Xrs", &tail)) { 2377 // Classic/EVM option, new functionality 2378 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2379 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2380 // change default internal VM signals used - lower case for back compat 2381 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2382 // -Xoptimize 2383 } else if (match_option(option, "-Xoptimize", &tail)) { 2384 // EVM option, ignore silently for compatibility 2385 // -Xprof 2386 } else if (match_option(option, "-Xprof", &tail)) { 2387#ifndef FPROF_KERNEL 2388 _has_profile = true; 2389#else // FPROF_KERNEL 2390 // do we have to exit? 2391 warning("Kernel VM does not support flat profiling."); 2392#endif // FPROF_KERNEL 2393 // -Xaprof 2394 } else if (match_option(option, "-Xaprof", &tail)) { 2395 _has_alloc_profile = true; 2396 // -Xconcurrentio 2397 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2398 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2399 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2400 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2401 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2402 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2403 2404 // -Xinternalversion 2405 } else if (match_option(option, "-Xinternalversion", &tail)) { 2406 jio_fprintf(defaultStream::output_stream(), "%s\n", 2407 VM_Version::internal_vm_info_string()); 2408 vm_exit(0); 2409#ifndef PRODUCT 2410 // -Xprintflags 2411 } else if (match_option(option, "-Xprintflags", &tail)) { 2412 CommandLineFlags::printFlags(tty, false); 2413 vm_exit(0); 2414#endif 2415 // -D 2416 } else if (match_option(option, "-D", &tail)) { 2417 if (!add_property(tail)) { 2418 return JNI_ENOMEM; 2419 } 2420 // Out of the box management support 2421 if (match_option(option, "-Dcom.sun.management", &tail)) { 2422 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2423 } 2424 // -Xint 2425 } else if (match_option(option, "-Xint", &tail)) { 2426 set_mode_flags(_int); 2427 // -Xmixed 2428 } else if (match_option(option, "-Xmixed", &tail)) { 2429 set_mode_flags(_mixed); 2430 // -Xcomp 2431 } else if (match_option(option, "-Xcomp", &tail)) { 2432 // for testing the compiler; turn off all flags that inhibit compilation 2433 set_mode_flags(_comp); 2434 2435 // -Xshare:dump 2436 } else if (match_option(option, "-Xshare:dump", &tail)) { 2437#if defined(KERNEL) 2438 vm_exit_during_initialization( 2439 "Dumping a shared archive is not supported on the Kernel JVM.", NULL); 2440#else 2441 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2442 set_mode_flags(_int); // Prevent compilation, which creates objects 2443#endif 2444 // -Xshare:on 2445 } else if (match_option(option, "-Xshare:on", &tail)) { 2446 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2447 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2448 // -Xshare:auto 2449 } else if (match_option(option, "-Xshare:auto", &tail)) { 2450 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2451 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2452 // -Xshare:off 2453 } else if (match_option(option, "-Xshare:off", &tail)) { 2454 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2455 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2456 2457 // -Xverify 2458 } else if (match_option(option, "-Xverify", &tail)) { 2459 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2460 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2461 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2462 } else if (strcmp(tail, ":remote") == 0) { 2463 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2464 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2465 } else if (strcmp(tail, ":none") == 0) { 2466 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2467 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2468 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2469 return JNI_EINVAL; 2470 } 2471 // -Xdebug 2472 } else if (match_option(option, "-Xdebug", &tail)) { 2473 // note this flag has been used, then ignore 2474 set_xdebug_mode(true); 2475 // -Xnoagent 2476 } else if (match_option(option, "-Xnoagent", &tail)) { 2477 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2478 } else if (match_option(option, "-Xboundthreads", &tail)) { 2479 // Bind user level threads to kernel threads (Solaris only) 2480 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2481 } else if (match_option(option, "-Xloggc:", &tail)) { 2482 // Redirect GC output to the file. -Xloggc:<filename> 2483 // ostream_init_log(), when called will use this filename 2484 // to initialize a fileStream. 2485 _gc_log_filename = strdup(tail); 2486 FLAG_SET_CMDLINE(bool, PrintGC, true); 2487 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2488 2489 // JNI hooks 2490 } else if (match_option(option, "-Xcheck", &tail)) { 2491 if (!strcmp(tail, ":jni")) { 2492 CheckJNICalls = true; 2493 } else if (is_bad_option(option, args->ignoreUnrecognized, 2494 "check")) { 2495 return JNI_EINVAL; 2496 } 2497 } else if (match_option(option, "vfprintf", &tail)) { 2498 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2499 } else if (match_option(option, "exit", &tail)) { 2500 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2501 } else if (match_option(option, "abort", &tail)) { 2502 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2503 // -XX:+AggressiveHeap 2504 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2505 2506 // This option inspects the machine and attempts to set various 2507 // parameters to be optimal for long-running, memory allocation 2508 // intensive jobs. It is intended for machines with large 2509 // amounts of cpu and memory. 2510 2511 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2512 // VM, but we may not be able to represent the total physical memory 2513 // available (like having 8gb of memory on a box but using a 32bit VM). 2514 // Thus, we need to make sure we're using a julong for intermediate 2515 // calculations. 2516 julong initHeapSize; 2517 julong total_memory = os::physical_memory(); 2518 2519 if (total_memory < (julong)256*M) { 2520 jio_fprintf(defaultStream::error_stream(), 2521 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2522 vm_exit(1); 2523 } 2524 2525 // The heap size is half of available memory, or (at most) 2526 // all of possible memory less 160mb (leaving room for the OS 2527 // when using ISM). This is the maximum; because adaptive sizing 2528 // is turned on below, the actual space used may be smaller. 2529 2530 initHeapSize = MIN2(total_memory / (julong)2, 2531 total_memory - (julong)160*M); 2532 2533 // Make sure that if we have a lot of memory we cap the 32 bit 2534 // process space. The 64bit VM version of this function is a nop. 2535 initHeapSize = os::allocatable_physical_memory(initHeapSize); 2536 2537 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2538 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2539 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2540 // Currently the minimum size and the initial heap sizes are the same. 2541 set_min_heap_size(initHeapSize); 2542 } 2543 if (FLAG_IS_DEFAULT(NewSize)) { 2544 // Make the young generation 3/8ths of the total heap. 2545 FLAG_SET_CMDLINE(uintx, NewSize, 2546 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2547 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2548 } 2549 2550 FLAG_SET_DEFAULT(UseLargePages, true); 2551 2552 // Increase some data structure sizes for efficiency 2553 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2554 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2555 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2556 2557 // See the OldPLABSize comment below, but replace 'after promotion' 2558 // with 'after copying'. YoungPLABSize is the size of the survivor 2559 // space per-gc-thread buffers. The default is 4kw. 2560 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2561 2562 // OldPLABSize is the size of the buffers in the old gen that 2563 // UseParallelGC uses to promote live data that doesn't fit in the 2564 // survivor spaces. At any given time, there's one for each gc thread. 2565 // The default size is 1kw. These buffers are rarely used, since the 2566 // survivor spaces are usually big enough. For specjbb, however, there 2567 // are occasions when there's lots of live data in the young gen 2568 // and we end up promoting some of it. We don't have a definite 2569 // explanation for why bumping OldPLABSize helps, but the theory 2570 // is that a bigger PLAB results in retaining something like the 2571 // original allocation order after promotion, which improves mutator 2572 // locality. A minor effect may be that larger PLABs reduce the 2573 // number of PLAB allocation events during gc. The value of 8kw 2574 // was arrived at by experimenting with specjbb. 2575 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2576 2577 // Enable parallel GC and adaptive generation sizing 2578 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2579 FLAG_SET_DEFAULT(ParallelGCThreads, 2580 Abstract_VM_Version::parallel_worker_threads()); 2581 2582 // Encourage steady state memory management 2583 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2584 2585 // This appears to improve mutator locality 2586 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2587 2588 // Get around early Solaris scheduling bug 2589 // (affinity vs other jobs on system) 2590 // but disallow DR and offlining (5008695). 2591 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 2592 2593 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 2594 // The last option must always win. 2595 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 2596 FLAG_SET_CMDLINE(bool, NeverTenure, true); 2597 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 2598 // The last option must always win. 2599 FLAG_SET_CMDLINE(bool, NeverTenure, false); 2600 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 2601 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 2602 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 2603 jio_fprintf(defaultStream::error_stream(), 2604 "Please use CMSClassUnloadingEnabled in place of " 2605 "CMSPermGenSweepingEnabled in the future\n"); 2606 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 2607 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 2608 jio_fprintf(defaultStream::error_stream(), 2609 "Please use -XX:+UseGCOverheadLimit in place of " 2610 "-XX:+UseGCTimeLimit in the future\n"); 2611 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 2612 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 2613 jio_fprintf(defaultStream::error_stream(), 2614 "Please use -XX:-UseGCOverheadLimit in place of " 2615 "-XX:-UseGCTimeLimit in the future\n"); 2616 // The TLE options are for compatibility with 1.3 and will be 2617 // removed without notice in a future release. These options 2618 // are not to be documented. 2619 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 2620 // No longer used. 2621 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 2622 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 2623 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 2624 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2625 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 2626 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 2627 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 2628 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 2629 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 2630 // No longer used. 2631 } else if (match_option(option, "-XX:TLESize=", &tail)) { 2632 julong long_tlab_size = 0; 2633 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 2634 if (errcode != arg_in_range) { 2635 jio_fprintf(defaultStream::error_stream(), 2636 "Invalid TLAB size: %s\n", option->optionString); 2637 describe_range_error(errcode); 2638 return JNI_EINVAL; 2639 } 2640 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 2641 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 2642 // No longer used. 2643 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 2644 FLAG_SET_CMDLINE(bool, UseTLAB, true); 2645 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 2646 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2647SOLARIS_ONLY( 2648 } else if (match_option(option, "-XX:+UsePermISM", &tail)) { 2649 warning("-XX:+UsePermISM is obsolete."); 2650 FLAG_SET_CMDLINE(bool, UseISM, true); 2651 } else if (match_option(option, "-XX:-UsePermISM", &tail)) { 2652 FLAG_SET_CMDLINE(bool, UseISM, false); 2653) 2654 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 2655 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 2656 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 2657 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 2658 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 2659 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 2660 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 2661#if defined(DTRACE_ENABLED) 2662 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 2663 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 2664 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 2665 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 2666#else // defined(DTRACE_ENABLED) 2667 jio_fprintf(defaultStream::error_stream(), 2668 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 2669 return JNI_EINVAL; 2670#endif // defined(DTRACE_ENABLED) 2671#ifdef ASSERT 2672 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 2673 FLAG_SET_CMDLINE(bool, FullGCALot, true); 2674 // disable scavenge before parallel mark-compact 2675 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2676#endif 2677 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 2678 julong cms_blocks_to_claim = (julong)atol(tail); 2679 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2680 jio_fprintf(defaultStream::error_stream(), 2681 "Please use -XX:OldPLABSize in place of " 2682 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 2683 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 2684 julong cms_blocks_to_claim = (julong)atol(tail); 2685 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2686 jio_fprintf(defaultStream::error_stream(), 2687 "Please use -XX:OldPLABSize in place of " 2688 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 2689 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 2690 julong old_plab_size = 0; 2691 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 2692 if (errcode != arg_in_range) { 2693 jio_fprintf(defaultStream::error_stream(), 2694 "Invalid old PLAB size: %s\n", option->optionString); 2695 describe_range_error(errcode); 2696 return JNI_EINVAL; 2697 } 2698 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 2699 jio_fprintf(defaultStream::error_stream(), 2700 "Please use -XX:OldPLABSize in place of " 2701 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 2702 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 2703 julong young_plab_size = 0; 2704 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 2705 if (errcode != arg_in_range) { 2706 jio_fprintf(defaultStream::error_stream(), 2707 "Invalid young PLAB size: %s\n", option->optionString); 2708 describe_range_error(errcode); 2709 return JNI_EINVAL; 2710 } 2711 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 2712 jio_fprintf(defaultStream::error_stream(), 2713 "Please use -XX:YoungPLABSize in place of " 2714 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 2715 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 2716 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 2717 julong stack_size = 0; 2718 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 2719 if (errcode != arg_in_range) { 2720 jio_fprintf(defaultStream::error_stream(), 2721 "Invalid mark stack size: %s\n", option->optionString); 2722 describe_range_error(errcode); 2723 return JNI_EINVAL; 2724 } 2725 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 2726 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 2727 julong max_stack_size = 0; 2728 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 2729 if (errcode != arg_in_range) { 2730 jio_fprintf(defaultStream::error_stream(), 2731 "Invalid maximum mark stack size: %s\n", 2732 option->optionString); 2733 describe_range_error(errcode); 2734 return JNI_EINVAL; 2735 } 2736 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 2737 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 2738 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 2739 uintx conc_threads = 0; 2740 if (!parse_uintx(tail, &conc_threads, 1)) { 2741 jio_fprintf(defaultStream::error_stream(), 2742 "Invalid concurrent threads: %s\n", option->optionString); 2743 return JNI_EINVAL; 2744 } 2745 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 2746 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 2747 julong max_direct_memory_size = 0; 2748 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 2749 if (errcode != arg_in_range) { 2750 jio_fprintf(defaultStream::error_stream(), 2751 "Invalid maximum direct memory size: %s\n", 2752 option->optionString); 2753 describe_range_error(errcode); 2754 return JNI_EINVAL; 2755 } 2756 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 2757 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2758 // Skip -XX:Flags= since that case has already been handled 2759 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 2760 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2761 return JNI_EINVAL; 2762 } 2763 } 2764 // Unknown option 2765 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2766 return JNI_ERR; 2767 } 2768 } 2769 2770 // Change the default value for flags which have different default values 2771 // when working with older JDKs. 2772 if (JDK_Version::current().compare_major(6) <= 0 && 2773 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) { 2774 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true); 2775 } 2776#ifdef LINUX 2777 if (JDK_Version::current().compare_major(6) <= 0 && 2778 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 2779 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 2780 } 2781#endif // LINUX 2782 return JNI_OK; 2783} 2784 2785jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 2786 // This must be done after all -D arguments have been processed. 2787 scp_p->expand_endorsed(); 2788 2789 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 2790 // Assemble the bootclasspath elements into the final path. 2791 Arguments::set_sysclasspath(scp_p->combined_path()); 2792 } 2793 2794 // This must be done after all arguments have been processed. 2795 // java_compiler() true means set to "NONE" or empty. 2796 if (java_compiler() && !xdebug_mode()) { 2797 // For backwards compatibility, we switch to interpreted mode if 2798 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 2799 // not specified. 2800 set_mode_flags(_int); 2801 } 2802 if (CompileThreshold == 0) { 2803 set_mode_flags(_int); 2804 } 2805 2806#ifndef COMPILER2 2807 // Don't degrade server performance for footprint 2808 if (FLAG_IS_DEFAULT(UseLargePages) && 2809 MaxHeapSize < LargePageHeapSizeThreshold) { 2810 // No need for large granularity pages w/small heaps. 2811 // Note that large pages are enabled/disabled for both the 2812 // Java heap and the code cache. 2813 FLAG_SET_DEFAULT(UseLargePages, false); 2814 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false)); 2815 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false)); 2816 } 2817 2818 // Tiered compilation is undefined with C1. 2819 TieredCompilation = false; 2820#else 2821 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 2822 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 2823 } 2824#endif 2825 2826 // If we are running in a headless jre, force java.awt.headless property 2827 // to be true unless the property has already been set. 2828 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 2829 if (os::is_headless_jre()) { 2830 const char* headless = Arguments::get_property("java.awt.headless"); 2831 if (headless == NULL) { 2832 char envbuffer[128]; 2833 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 2834 if (!add_property("java.awt.headless=true")) { 2835 return JNI_ENOMEM; 2836 } 2837 } else { 2838 char buffer[256]; 2839 strcpy(buffer, "java.awt.headless="); 2840 strcat(buffer, envbuffer); 2841 if (!add_property(buffer)) { 2842 return JNI_ENOMEM; 2843 } 2844 } 2845 } 2846 } 2847 2848 if (!check_vm_args_consistency()) { 2849 return JNI_ERR; 2850 } 2851 2852 return JNI_OK; 2853} 2854 2855jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2856 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 2857 scp_assembly_required_p); 2858} 2859 2860jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2861 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 2862 scp_assembly_required_p); 2863} 2864 2865jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 2866 const int N_MAX_OPTIONS = 64; 2867 const int OPTION_BUFFER_SIZE = 1024; 2868 char buffer[OPTION_BUFFER_SIZE]; 2869 2870 // The variable will be ignored if it exceeds the length of the buffer. 2871 // Don't check this variable if user has special privileges 2872 // (e.g. unix su command). 2873 if (os::getenv(name, buffer, sizeof(buffer)) && 2874 !os::have_special_privileges()) { 2875 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 2876 jio_fprintf(defaultStream::error_stream(), 2877 "Picked up %s: %s\n", name, buffer); 2878 char* rd = buffer; // pointer to the input string (rd) 2879 int i; 2880 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 2881 while (isspace(*rd)) rd++; // skip whitespace 2882 if (*rd == 0) break; // we re done when the input string is read completely 2883 2884 // The output, option string, overwrites the input string. 2885 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 2886 // input string (rd). 2887 char* wrt = rd; 2888 2889 options[i++].optionString = wrt; // Fill in option 2890 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 2891 if (*rd == '\'' || *rd == '"') { // handle a quoted string 2892 int quote = *rd; // matching quote to look for 2893 rd++; // don't copy open quote 2894 while (*rd != quote) { // include everything (even spaces) up until quote 2895 if (*rd == 0) { // string termination means unmatched string 2896 jio_fprintf(defaultStream::error_stream(), 2897 "Unmatched quote in %s\n", name); 2898 return JNI_ERR; 2899 } 2900 *wrt++ = *rd++; // copy to option string 2901 } 2902 rd++; // don't copy close quote 2903 } else { 2904 *wrt++ = *rd++; // copy to option string 2905 } 2906 } 2907 // Need to check if we're done before writing a NULL, 2908 // because the write could be to the byte that rd is pointing to. 2909 if (*rd++ == 0) { 2910 *wrt = 0; 2911 break; 2912 } 2913 *wrt = 0; // Zero terminate option 2914 } 2915 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 2916 JavaVMInitArgs vm_args; 2917 vm_args.version = JNI_VERSION_1_2; 2918 vm_args.options = options; 2919 vm_args.nOptions = i; 2920 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 2921 2922 if (PrintVMOptions) { 2923 const char* tail; 2924 for (int i = 0; i < vm_args.nOptions; i++) { 2925 const JavaVMOption *option = vm_args.options + i; 2926 if (match_option(option, "-XX:", &tail)) { 2927 logOption(tail); 2928 } 2929 } 2930 } 2931 2932 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR)); 2933 } 2934 return JNI_OK; 2935} 2936 2937void Arguments::set_shared_spaces_flags() { 2938 const bool must_share = DumpSharedSpaces || RequireSharedSpaces; 2939 const bool might_share = must_share || UseSharedSpaces; 2940 2941 // CompressedOops cannot be used with CDS. The offsets of oopmaps and 2942 // static fields are incorrect in the archive. With some more clever 2943 // initialization, this restriction can probably be lifted. 2944 // ??? UseLargePages might be okay now 2945 const bool cannot_share = UseCompressedOops || 2946 (UseLargePages && FLAG_IS_CMDLINE(UseLargePages)); 2947 if (cannot_share) { 2948 if (must_share) { 2949 warning("disabling large pages %s" 2950 "because of %s", "" LP64_ONLY("and compressed oops "), 2951 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on"); 2952 FLAG_SET_CMDLINE(bool, UseLargePages, false); 2953 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false)); 2954 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false)); 2955 } else { 2956 // Prefer compressed oops and large pages to class data sharing 2957 if (UseSharedSpaces && Verbose) { 2958 warning("turning off use of shared archive because of large pages%s", 2959 "" LP64_ONLY(" and/or compressed oops")); 2960 } 2961 no_shared_spaces(); 2962 } 2963 } else if (UseLargePages && might_share) { 2964 // Disable large pages to allow shared spaces. This is sub-optimal, since 2965 // there may not even be a shared archive to use. 2966 FLAG_SET_DEFAULT(UseLargePages, false); 2967 } 2968 2969 // Add 2M to any size for SharedReadOnlySize to get around the JPRT setting 2970 if (DumpSharedSpaces && !FLAG_IS_DEFAULT(SharedReadOnlySize)) { 2971 SharedReadOnlySize = 14*M; 2972 } 2973 2974 if (DumpSharedSpaces) { 2975 if (RequireSharedSpaces) { 2976 warning("cannot dump shared archive while using shared archive"); 2977 } 2978 UseSharedSpaces = false; 2979 } 2980} 2981 2982// Disable options not supported in this release, with a warning if they 2983// were explicitly requested on the command-line 2984#define UNSUPPORTED_OPTION(opt, description) \ 2985do { \ 2986 if (opt) { \ 2987 if (FLAG_IS_CMDLINE(opt)) { \ 2988 warning(description " is disabled in this release."); \ 2989 } \ 2990 FLAG_SET_DEFAULT(opt, false); \ 2991 } \ 2992} while(0) 2993 2994// Parse entry point called from JNI_CreateJavaVM 2995 2996jint Arguments::parse(const JavaVMInitArgs* args) { 2997 2998 // Sharing support 2999 // Construct the path to the archive 3000 char jvm_path[JVM_MAXPATHLEN]; 3001 os::jvm_path(jvm_path, sizeof(jvm_path)); 3002 char *end = strrchr(jvm_path, *os::file_separator()); 3003 if (end != NULL) *end = '\0'; 3004 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) + 3005 strlen(os::file_separator()) + 20, mtInternal); 3006 if (shared_archive_path == NULL) return JNI_ENOMEM; 3007 strcpy(shared_archive_path, jvm_path); 3008 strcat(shared_archive_path, os::file_separator()); 3009 strcat(shared_archive_path, "classes"); 3010 DEBUG_ONLY(strcat(shared_archive_path, "_g");) 3011 strcat(shared_archive_path, ".jsa"); 3012 SharedArchivePath = shared_archive_path; 3013 3014 // Remaining part of option string 3015 const char* tail; 3016 3017 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3018 const char* hotspotrc = ".hotspotrc"; 3019 bool settings_file_specified = false; 3020 bool needs_hotspotrc_warning = false; 3021 3022 const char* flags_file; 3023 int index; 3024 for (index = 0; index < args->nOptions; index++) { 3025 const JavaVMOption *option = args->options + index; 3026 if (match_option(option, "-XX:Flags=", &tail)) { 3027 flags_file = tail; 3028 settings_file_specified = true; 3029 } 3030 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3031 PrintVMOptions = true; 3032 } 3033 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3034 PrintVMOptions = false; 3035 } 3036 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3037 IgnoreUnrecognizedVMOptions = true; 3038 } 3039 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3040 IgnoreUnrecognizedVMOptions = false; 3041 } 3042 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3043 CommandLineFlags::printFlags(tty, false); 3044 vm_exit(0); 3045 } 3046 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3047 MemTracker::init_tracking_options(tail); 3048 } 3049 3050 3051#ifndef PRODUCT 3052 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3053 CommandLineFlags::printFlags(tty, true); 3054 vm_exit(0); 3055 } 3056#endif 3057 } 3058 3059 if (IgnoreUnrecognizedVMOptions) { 3060 // uncast const to modify the flag args->ignoreUnrecognized 3061 *(jboolean*)(&args->ignoreUnrecognized) = true; 3062 } 3063 3064 // Parse specified settings file 3065 if (settings_file_specified) { 3066 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3067 return JNI_EINVAL; 3068 } 3069 } else { 3070#ifdef ASSERT 3071 // Parse default .hotspotrc settings file 3072 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3073 return JNI_EINVAL; 3074 } 3075#else 3076 struct stat buf; 3077 if (os::stat(hotspotrc, &buf) == 0) { 3078 needs_hotspotrc_warning = true; 3079 } 3080#endif 3081 } 3082 3083 if (PrintVMOptions) { 3084 for (index = 0; index < args->nOptions; index++) { 3085 const JavaVMOption *option = args->options + index; 3086 if (match_option(option, "-XX:", &tail)) { 3087 logOption(tail); 3088 } 3089 } 3090 } 3091 3092 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3093 jint result = parse_vm_init_args(args); 3094 if (result != JNI_OK) { 3095 return result; 3096 } 3097 3098 // Delay warning until here so that we've had a chance to process 3099 // the -XX:-PrintWarnings flag 3100 if (needs_hotspotrc_warning) { 3101 warning("%s file is present but has been ignored. " 3102 "Run with -XX:Flags=%s to load the file.", 3103 hotspotrc, hotspotrc); 3104 } 3105 3106#if (defined JAVASE_EMBEDDED || defined ARM) 3107 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3108#endif 3109 3110#ifndef PRODUCT 3111 if (TraceBytecodesAt != 0) { 3112 TraceBytecodes = true; 3113 } 3114 if (CountCompiledCalls) { 3115 if (UseCounterDecay) { 3116 warning("UseCounterDecay disabled because CountCalls is set"); 3117 UseCounterDecay = false; 3118 } 3119 } 3120#endif // PRODUCT 3121 3122 // JSR 292 is not supported before 1.7 3123 if (!JDK_Version::is_gte_jdk17x_version()) { 3124 if (EnableInvokeDynamic) { 3125 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3126 warning("JSR 292 is not supported before 1.7. Disabling support."); 3127 } 3128 EnableInvokeDynamic = false; 3129 } 3130 } 3131 3132 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 3133 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3134 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 3135 } 3136 ScavengeRootsInCode = 1; 3137 } 3138 3139 if (PrintGCDetails) { 3140 // Turn on -verbose:gc options as well 3141 PrintGC = true; 3142 } 3143 3144 if (!JDK_Version::is_gte_jdk18x_version()) { 3145 // To avoid changing the log format for 7 updates this flag is only 3146 // true by default in JDK8 and above. 3147 if (FLAG_IS_DEFAULT(PrintGCCause)) { 3148 FLAG_SET_DEFAULT(PrintGCCause, false); 3149 } 3150 } 3151 3152 // Set object alignment values. 3153 set_object_alignment(); 3154 3155#ifdef SERIALGC 3156 force_serial_gc(); 3157#endif // SERIALGC 3158#ifdef KERNEL 3159 no_shared_spaces(); 3160#endif // KERNEL 3161 3162 // Set flags based on ergonomics. 3163 set_ergonomics_flags(); 3164 3165 set_shared_spaces_flags(); 3166 3167 // Check the GC selections again. 3168 if (!check_gc_consistency()) { 3169 return JNI_EINVAL; 3170 } 3171 3172 if (TieredCompilation) { 3173 set_tiered_flags(); 3174 } else { 3175 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3176 if (CompilationPolicyChoice >= 2) { 3177 vm_exit_during_initialization( 3178 "Incompatible compilation policy selected", NULL); 3179 } 3180 } 3181 3182#ifndef KERNEL 3183 // Set heap size based on available physical memory 3184 set_heap_size(); 3185 // Set per-collector flags 3186 if (UseParallelGC || UseParallelOldGC) { 3187 set_parallel_gc_flags(); 3188 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below 3189 set_cms_and_parnew_gc_flags(); 3190 } else if (UseParNewGC) { // skipped if CMS is set above 3191 set_parnew_gc_flags(); 3192 } else if (UseG1GC) { 3193 set_g1_gc_flags(); 3194 } 3195#endif // KERNEL 3196 3197#ifdef SERIALGC 3198 assert(verify_serial_gc_flags(), "SerialGC unset"); 3199#endif // SERIALGC 3200 3201 // Set bytecode rewriting flags 3202 set_bytecode_flags(); 3203 3204 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 3205 set_aggressive_opts_flags(); 3206 3207 // Turn off biased locking for locking debug mode flags, 3208 // which are subtlely different from each other but neither works with 3209 // biased locking. 3210 if (UseHeavyMonitors 3211#ifdef COMPILER1 3212 || !UseFastLocking 3213#endif // COMPILER1 3214 ) { 3215 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3216 // flag set to true on command line; warn the user that they 3217 // can't enable biased locking here 3218 warning("Biased Locking is not supported with locking debug flags" 3219 "; ignoring UseBiasedLocking flag." ); 3220 } 3221 UseBiasedLocking = false; 3222 } 3223 3224#ifdef CC_INTERP 3225 // Clear flags not supported by the C++ interpreter 3226 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3227 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3228 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3229 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false)); 3230#endif // CC_INTERP 3231 3232#ifdef COMPILER2 3233 if (!UseBiasedLocking || EmitSync != 0) { 3234 UseOptoBiasInlining = false; 3235 } 3236 if (!EliminateLocks) { 3237 EliminateNestedLocks = false; 3238 } 3239#endif 3240 3241 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3242 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3243 DebugNonSafepoints = true; 3244 } 3245 3246#ifndef PRODUCT 3247 if (CompileTheWorld) { 3248 // Force NmethodSweeper to sweep whole CodeCache each time. 3249 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3250 NmethodSweepFraction = 1; 3251 } 3252 } 3253#endif 3254 3255 if (PrintCommandLineFlags) { 3256 CommandLineFlags::printSetFlags(tty); 3257 } 3258 3259 // Apply CPU specific policy for the BiasedLocking 3260 if (UseBiasedLocking) { 3261 if (!VM_Version::use_biased_locking() && 3262 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3263 UseBiasedLocking = false; 3264 } 3265 } 3266 3267 // set PauseAtExit if the gamma launcher was used and a debugger is attached 3268 // but only if not already set on the commandline 3269 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) { 3270 bool set = false; 3271 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set); 3272 if (!set) { 3273 FLAG_SET_DEFAULT(PauseAtExit, true); 3274 } 3275 } 3276 3277 return JNI_OK; 3278} 3279 3280int Arguments::PropertyList_count(SystemProperty* pl) { 3281 int count = 0; 3282 while(pl != NULL) { 3283 count++; 3284 pl = pl->next(); 3285 } 3286 return count; 3287} 3288 3289const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3290 assert(key != NULL, "just checking"); 3291 SystemProperty* prop; 3292 for (prop = pl; prop != NULL; prop = prop->next()) { 3293 if (strcmp(key, prop->key()) == 0) return prop->value(); 3294 } 3295 return NULL; 3296} 3297 3298const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3299 int count = 0; 3300 const char* ret_val = NULL; 3301 3302 while(pl != NULL) { 3303 if(count >= index) { 3304 ret_val = pl->key(); 3305 break; 3306 } 3307 count++; 3308 pl = pl->next(); 3309 } 3310 3311 return ret_val; 3312} 3313 3314char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3315 int count = 0; 3316 char* ret_val = NULL; 3317 3318 while(pl != NULL) { 3319 if(count >= index) { 3320 ret_val = pl->value(); 3321 break; 3322 } 3323 count++; 3324 pl = pl->next(); 3325 } 3326 3327 return ret_val; 3328} 3329 3330void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3331 SystemProperty* p = *plist; 3332 if (p == NULL) { 3333 *plist = new_p; 3334 } else { 3335 while (p->next() != NULL) { 3336 p = p->next(); 3337 } 3338 p->set_next(new_p); 3339 } 3340} 3341 3342void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3343 if (plist == NULL) 3344 return; 3345 3346 SystemProperty* new_p = new SystemProperty(k, v, true); 3347 PropertyList_add(plist, new_p); 3348} 3349 3350// This add maintains unique property key in the list. 3351void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3352 if (plist == NULL) 3353 return; 3354 3355 // If property key exist then update with new value. 3356 SystemProperty* prop; 3357 for (prop = *plist; prop != NULL; prop = prop->next()) { 3358 if (strcmp(k, prop->key()) == 0) { 3359 if (append) { 3360 prop->append_value(v); 3361 } else { 3362 prop->set_value(v); 3363 } 3364 return; 3365 } 3366 } 3367 3368 PropertyList_add(plist, k, v); 3369} 3370 3371#ifdef KERNEL 3372char *Arguments::get_kernel_properties() { 3373 // Find properties starting with kernel and append them to string 3374 // We need to find out how long they are first because the URL's that they 3375 // might point to could get long. 3376 int length = 0; 3377 SystemProperty* prop; 3378 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 3379 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 3380 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D =" 3381 } 3382 } 3383 // Add one for null terminator. 3384 char *props = AllocateHeap(length + 1, mtInternal); 3385 if (length != 0) { 3386 int pos = 0; 3387 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 3388 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 3389 jio_snprintf(&props[pos], length-pos, 3390 "-D%s=%s ", prop->key(), prop->value()); 3391 pos = strlen(props); 3392 } 3393 } 3394 } 3395 // null terminate props in case of null 3396 props[length] = '\0'; 3397 return props; 3398} 3399#endif // KERNEL 3400 3401// Copies src into buf, replacing "%%" with "%" and "%p" with pid 3402// Returns true if all of the source pointed by src has been copied over to 3403// the destination buffer pointed by buf. Otherwise, returns false. 3404// Notes: 3405// 1. If the length (buflen) of the destination buffer excluding the 3406// NULL terminator character is not long enough for holding the expanded 3407// pid characters, it also returns false instead of returning the partially 3408// expanded one. 3409// 2. The passed in "buflen" should be large enough to hold the null terminator. 3410bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3411 char* buf, size_t buflen) { 3412 const char* p = src; 3413 char* b = buf; 3414 const char* src_end = &src[srclen]; 3415 char* buf_end = &buf[buflen - 1]; 3416 3417 while (p < src_end && b < buf_end) { 3418 if (*p == '%') { 3419 switch (*(++p)) { 3420 case '%': // "%%" ==> "%" 3421 *b++ = *p++; 3422 break; 3423 case 'p': { // "%p" ==> current process id 3424 // buf_end points to the character before the last character so 3425 // that we could write '\0' to the end of the buffer. 3426 size_t buf_sz = buf_end - b + 1; 3427 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3428 3429 // if jio_snprintf fails or the buffer is not long enough to hold 3430 // the expanded pid, returns false. 3431 if (ret < 0 || ret >= (int)buf_sz) { 3432 return false; 3433 } else { 3434 b += ret; 3435 assert(*b == '\0', "fail in copy_expand_pid"); 3436 if (p == src_end && b == buf_end + 1) { 3437 // reach the end of the buffer. 3438 return true; 3439 } 3440 } 3441 p++; 3442 break; 3443 } 3444 default : 3445 *b++ = '%'; 3446 } 3447 } else { 3448 *b++ = *p++; 3449 } 3450 } 3451 *b = '\0'; 3452 return (p == src_end); // return false if not all of the source was copied 3453} 3454