arguments.cpp revision 5266:40136aa2cdb1
1/* 2 * Copyright (c) 1997, 2013, 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 "classfile/symbolTable.hpp" 28#include "compiler/compilerOracle.hpp" 29#include "memory/allocation.inline.hpp" 30#include "memory/cardTableRS.hpp" 31#include "memory/genCollectedHeap.hpp" 32#include "memory/referenceProcessor.hpp" 33#include "memory/universe.inline.hpp" 34#include "oops/oop.inline.hpp" 35#include "prims/jvmtiExport.hpp" 36#include "runtime/arguments.hpp" 37#include "runtime/globals_extension.hpp" 38#include "runtime/java.hpp" 39#include "services/management.hpp" 40#include "services/memTracker.hpp" 41#include "utilities/defaultStream.hpp" 42#include "utilities/macros.hpp" 43#include "utilities/taskqueue.hpp" 44#ifdef TARGET_OS_FAMILY_linux 45# include "os_linux.inline.hpp" 46#endif 47#ifdef TARGET_OS_FAMILY_solaris 48# include "os_solaris.inline.hpp" 49#endif 50#ifdef TARGET_OS_FAMILY_windows 51# include "os_windows.inline.hpp" 52#endif 53#ifdef TARGET_OS_FAMILY_bsd 54# include "os_bsd.inline.hpp" 55#endif 56#if INCLUDE_ALL_GCS 57#include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 58#include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 59#include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 60#endif // INCLUDE_ALL_GCS 61 62// Note: This is a special bug reporting site for the JVM 63#define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp" 64#define DEFAULT_JAVA_LAUNCHER "generic" 65 66// Disable options not supported in this release, with a warning if they 67// were explicitly requested on the command-line 68#define UNSUPPORTED_OPTION(opt, description) \ 69do { \ 70 if (opt) { \ 71 if (FLAG_IS_CMDLINE(opt)) { \ 72 warning(description " is disabled in this release."); \ 73 } \ 74 FLAG_SET_DEFAULT(opt, false); \ 75 } \ 76} while(0) 77 78#define UNSUPPORTED_GC_OPTION(gc) \ 79do { \ 80 if (gc) { \ 81 if (FLAG_IS_CMDLINE(gc)) { \ 82 warning(#gc " is not supported in this VM. Using Serial GC."); \ 83 } \ 84 FLAG_SET_DEFAULT(gc, false); \ 85 } \ 86} while(0) 87 88char** Arguments::_jvm_flags_array = NULL; 89int Arguments::_num_jvm_flags = 0; 90char** Arguments::_jvm_args_array = NULL; 91int Arguments::_num_jvm_args = 0; 92char* Arguments::_java_command = NULL; 93SystemProperty* Arguments::_system_properties = NULL; 94const char* Arguments::_gc_log_filename = NULL; 95bool Arguments::_has_profile = false; 96size_t Arguments::_conservative_max_heap_alignment = 0; 97uintx Arguments::_min_heap_size = 0; 98Arguments::Mode Arguments::_mode = _mixed; 99bool Arguments::_java_compiler = false; 100bool Arguments::_xdebug_mode = false; 101const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 102const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 103int Arguments::_sun_java_launcher_pid = -1; 104bool Arguments::_created_by_gamma_launcher = false; 105 106// These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 107bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 108bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 109bool Arguments::_BackgroundCompilation = BackgroundCompilation; 110bool Arguments::_ClipInlining = ClipInlining; 111 112char* Arguments::SharedArchivePath = NULL; 113 114AgentLibraryList Arguments::_libraryList; 115AgentLibraryList Arguments::_agentList; 116 117abort_hook_t Arguments::_abort_hook = NULL; 118exit_hook_t Arguments::_exit_hook = NULL; 119vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 120 121 122SystemProperty *Arguments::_java_ext_dirs = NULL; 123SystemProperty *Arguments::_java_endorsed_dirs = NULL; 124SystemProperty *Arguments::_sun_boot_library_path = NULL; 125SystemProperty *Arguments::_java_library_path = NULL; 126SystemProperty *Arguments::_java_home = NULL; 127SystemProperty *Arguments::_java_class_path = NULL; 128SystemProperty *Arguments::_sun_boot_class_path = NULL; 129 130char* Arguments::_meta_index_path = NULL; 131char* Arguments::_meta_index_dir = NULL; 132 133// Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 134 135static bool match_option(const JavaVMOption *option, const char* name, 136 const char** tail) { 137 int len = (int)strlen(name); 138 if (strncmp(option->optionString, name, len) == 0) { 139 *tail = option->optionString + len; 140 return true; 141 } else { 142 return false; 143 } 144} 145 146static void logOption(const char* opt) { 147 if (PrintVMOptions) { 148 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 149 } 150} 151 152// Process java launcher properties. 153void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 154 // See if sun.java.launcher or sun.java.launcher.pid is defined. 155 // Must do this before setting up other system properties, 156 // as some of them may depend on launcher type. 157 for (int index = 0; index < args->nOptions; index++) { 158 const JavaVMOption* option = args->options + index; 159 const char* tail; 160 161 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 162 process_java_launcher_argument(tail, option->extraInfo); 163 continue; 164 } 165 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 166 _sun_java_launcher_pid = atoi(tail); 167 continue; 168 } 169 } 170} 171 172// Initialize system properties key and value. 173void Arguments::init_system_properties() { 174 175 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 176 "Java Virtual Machine Specification", false)); 177 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 178 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 179 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 180 181 // following are JVMTI agent writeable properties. 182 // Properties values are set to NULL and they are 183 // os specific they are initialized in os::init_system_properties_values(). 184 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 185 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 186 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 187 _java_library_path = new SystemProperty("java.library.path", NULL, true); 188 _java_home = new SystemProperty("java.home", NULL, true); 189 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 190 191 _java_class_path = new SystemProperty("java.class.path", "", true); 192 193 // Add to System Property list. 194 PropertyList_add(&_system_properties, _java_ext_dirs); 195 PropertyList_add(&_system_properties, _java_endorsed_dirs); 196 PropertyList_add(&_system_properties, _sun_boot_library_path); 197 PropertyList_add(&_system_properties, _java_library_path); 198 PropertyList_add(&_system_properties, _java_home); 199 PropertyList_add(&_system_properties, _java_class_path); 200 PropertyList_add(&_system_properties, _sun_boot_class_path); 201 202 // Set OS specific system properties values 203 os::init_system_properties_values(); 204} 205 206 207 // Update/Initialize System properties after JDK version number is known 208void Arguments::init_version_specific_system_properties() { 209 enum { bufsz = 16 }; 210 char buffer[bufsz]; 211 const char* spec_vendor = "Sun Microsystems Inc."; 212 uint32_t spec_version = 0; 213 214 if (JDK_Version::is_gte_jdk17x_version()) { 215 spec_vendor = "Oracle Corporation"; 216 spec_version = JDK_Version::current().major_version(); 217 } 218 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 219 220 PropertyList_add(&_system_properties, 221 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 222 PropertyList_add(&_system_properties, 223 new SystemProperty("java.vm.specification.version", buffer, false)); 224 PropertyList_add(&_system_properties, 225 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 226} 227 228/** 229 * Provide a slightly more user-friendly way of eliminating -XX flags. 230 * When a flag is eliminated, it can be added to this list in order to 231 * continue accepting this flag on the command-line, while issuing a warning 232 * and ignoring the value. Once the JDK version reaches the 'accept_until' 233 * limit, we flatly refuse to admit the existence of the flag. This allows 234 * a flag to die correctly over JDK releases using HSX. 235 */ 236typedef struct { 237 const char* name; 238 JDK_Version obsoleted_in; // when the flag went away 239 JDK_Version accept_until; // which version to start denying the existence 240} ObsoleteFlag; 241 242static ObsoleteFlag obsolete_jvm_flags[] = { 243 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 244 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 245 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 246 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 247 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 248 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 249 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 250 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 251 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 252 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 253 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 254 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 255 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 256 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 257 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 258 { "DefaultInitialRAMFraction", 259 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 260 { "UseDepthFirstScavengeOrder", 261 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 262 { "HandlePromotionFailure", 263 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 264 { "MaxLiveObjectEvacuationRatio", 265 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 266 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 267 { "UseParallelOldGCCompacting", 268 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 269 { "UseParallelDensePrefixUpdate", 270 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 271 { "UseParallelOldGCDensePrefix", 272 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 273 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 274 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 275 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 276 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 277 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 278 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 279 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 280 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 281 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 282 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 283 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 284 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 285 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 286 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 287 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 288 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 289 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 290 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 291 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 292 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 293#ifdef PRODUCT 294 { "DesiredMethodLimit", 295 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 296#endif // PRODUCT 297 { NULL, JDK_Version(0), JDK_Version(0) } 298}; 299 300// Returns true if the flag is obsolete and fits into the range specified 301// for being ignored. In the case that the flag is ignored, the 'version' 302// value is filled in with the version number when the flag became 303// obsolete so that that value can be displayed to the user. 304bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 305 int i = 0; 306 assert(version != NULL, "Must provide a version buffer"); 307 while (obsolete_jvm_flags[i].name != NULL) { 308 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 309 // <flag>=xxx form 310 // [-|+]<flag> form 311 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 312 ((s[0] == '+' || s[0] == '-') && 313 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 314 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 315 *version = flag_status.obsoleted_in; 316 return true; 317 } 318 } 319 i++; 320 } 321 return false; 322} 323 324// Constructs the system class path (aka boot class path) from the following 325// components, in order: 326// 327// prefix // from -Xbootclasspath/p:... 328// endorsed // the expansion of -Djava.endorsed.dirs=... 329// base // from os::get_system_properties() or -Xbootclasspath= 330// suffix // from -Xbootclasspath/a:... 331// 332// java.endorsed.dirs is a list of directories; any jar or zip files in the 333// directories are added to the sysclasspath just before the base. 334// 335// This could be AllStatic, but it isn't needed after argument processing is 336// complete. 337class SysClassPath: public StackObj { 338public: 339 SysClassPath(const char* base); 340 ~SysClassPath(); 341 342 inline void set_base(const char* base); 343 inline void add_prefix(const char* prefix); 344 inline void add_suffix_to_prefix(const char* suffix); 345 inline void add_suffix(const char* suffix); 346 inline void reset_path(const char* base); 347 348 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 349 // property. Must be called after all command-line arguments have been 350 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 351 // combined_path(). 352 void expand_endorsed(); 353 354 inline const char* get_base() const { return _items[_scp_base]; } 355 inline const char* get_prefix() const { return _items[_scp_prefix]; } 356 inline const char* get_suffix() const { return _items[_scp_suffix]; } 357 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 358 359 // Combine all the components into a single c-heap-allocated string; caller 360 // must free the string if/when no longer needed. 361 char* combined_path(); 362 363private: 364 // Utility routines. 365 static char* add_to_path(const char* path, const char* str, bool prepend); 366 static char* add_jars_to_path(char* path, const char* directory); 367 368 inline void reset_item_at(int index); 369 370 // Array indices for the items that make up the sysclasspath. All except the 371 // base are allocated in the C heap and freed by this class. 372 enum { 373 _scp_prefix, // from -Xbootclasspath/p:... 374 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 375 _scp_base, // the default sysclasspath 376 _scp_suffix, // from -Xbootclasspath/a:... 377 _scp_nitems // the number of items, must be last. 378 }; 379 380 const char* _items[_scp_nitems]; 381 DEBUG_ONLY(bool _expansion_done;) 382}; 383 384SysClassPath::SysClassPath(const char* base) { 385 memset(_items, 0, sizeof(_items)); 386 _items[_scp_base] = base; 387 DEBUG_ONLY(_expansion_done = false;) 388} 389 390SysClassPath::~SysClassPath() { 391 // Free everything except the base. 392 for (int i = 0; i < _scp_nitems; ++i) { 393 if (i != _scp_base) reset_item_at(i); 394 } 395 DEBUG_ONLY(_expansion_done = false;) 396} 397 398inline void SysClassPath::set_base(const char* base) { 399 _items[_scp_base] = base; 400} 401 402inline void SysClassPath::add_prefix(const char* prefix) { 403 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 404} 405 406inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 407 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 408} 409 410inline void SysClassPath::add_suffix(const char* suffix) { 411 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 412} 413 414inline void SysClassPath::reset_item_at(int index) { 415 assert(index < _scp_nitems && index != _scp_base, "just checking"); 416 if (_items[index] != NULL) { 417 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 418 _items[index] = NULL; 419 } 420} 421 422inline void SysClassPath::reset_path(const char* base) { 423 // Clear the prefix and suffix. 424 reset_item_at(_scp_prefix); 425 reset_item_at(_scp_suffix); 426 set_base(base); 427} 428 429//------------------------------------------------------------------------------ 430 431void SysClassPath::expand_endorsed() { 432 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 433 434 const char* path = Arguments::get_property("java.endorsed.dirs"); 435 if (path == NULL) { 436 path = Arguments::get_endorsed_dir(); 437 assert(path != NULL, "no default for java.endorsed.dirs"); 438 } 439 440 char* expanded_path = NULL; 441 const char separator = *os::path_separator(); 442 const char* const end = path + strlen(path); 443 while (path < end) { 444 const char* tmp_end = strchr(path, separator); 445 if (tmp_end == NULL) { 446 expanded_path = add_jars_to_path(expanded_path, path); 447 path = end; 448 } else { 449 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 450 memcpy(dirpath, path, tmp_end - path); 451 dirpath[tmp_end - path] = '\0'; 452 expanded_path = add_jars_to_path(expanded_path, dirpath); 453 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 454 path = tmp_end + 1; 455 } 456 } 457 _items[_scp_endorsed] = expanded_path; 458 DEBUG_ONLY(_expansion_done = true;) 459} 460 461// Combine the bootclasspath elements, some of which may be null, into a single 462// c-heap-allocated string. 463char* SysClassPath::combined_path() { 464 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 465 assert(_expansion_done, "must call expand_endorsed() first."); 466 467 size_t lengths[_scp_nitems]; 468 size_t total_len = 0; 469 470 const char separator = *os::path_separator(); 471 472 // Get the lengths. 473 int i; 474 for (i = 0; i < _scp_nitems; ++i) { 475 if (_items[i] != NULL) { 476 lengths[i] = strlen(_items[i]); 477 // Include space for the separator char (or a NULL for the last item). 478 total_len += lengths[i] + 1; 479 } 480 } 481 assert(total_len > 0, "empty sysclasspath not allowed"); 482 483 // Copy the _items to a single string. 484 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 485 char* cp_tmp = cp; 486 for (i = 0; i < _scp_nitems; ++i) { 487 if (_items[i] != NULL) { 488 memcpy(cp_tmp, _items[i], lengths[i]); 489 cp_tmp += lengths[i]; 490 *cp_tmp++ = separator; 491 } 492 } 493 *--cp_tmp = '\0'; // Replace the extra separator. 494 return cp; 495} 496 497// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 498char* 499SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 500 char *cp; 501 502 assert(str != NULL, "just checking"); 503 if (path == NULL) { 504 size_t len = strlen(str) + 1; 505 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 506 memcpy(cp, str, len); // copy the trailing null 507 } else { 508 const char separator = *os::path_separator(); 509 size_t old_len = strlen(path); 510 size_t str_len = strlen(str); 511 size_t len = old_len + str_len + 2; 512 513 if (prepend) { 514 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 515 char* cp_tmp = cp; 516 memcpy(cp_tmp, str, str_len); 517 cp_tmp += str_len; 518 *cp_tmp = separator; 519 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 520 FREE_C_HEAP_ARRAY(char, path, mtInternal); 521 } else { 522 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 523 char* cp_tmp = cp + old_len; 524 *cp_tmp = separator; 525 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 526 } 527 } 528 return cp; 529} 530 531// Scan the directory and append any jar or zip files found to path. 532// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 533char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 534 DIR* dir = os::opendir(directory); 535 if (dir == NULL) return path; 536 537 char dir_sep[2] = { '\0', '\0' }; 538 size_t directory_len = strlen(directory); 539 const char fileSep = *os::file_separator(); 540 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 541 542 /* Scan the directory for jars/zips, appending them to path. */ 543 struct dirent *entry; 544 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 545 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 546 const char* name = entry->d_name; 547 const char* ext = name + strlen(name) - 4; 548 bool isJarOrZip = ext > name && 549 (os::file_name_strcmp(ext, ".jar") == 0 || 550 os::file_name_strcmp(ext, ".zip") == 0); 551 if (isJarOrZip) { 552 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 553 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 554 path = add_to_path(path, jarpath, false); 555 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 556 } 557 } 558 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 559 os::closedir(dir); 560 return path; 561} 562 563// Parses a memory size specification string. 564static bool atomull(const char *s, julong* result) { 565 julong n = 0; 566 int args_read = sscanf(s, JULONG_FORMAT, &n); 567 if (args_read != 1) { 568 return false; 569 } 570 while (*s != '\0' && isdigit(*s)) { 571 s++; 572 } 573 // 4705540: illegal if more characters are found after the first non-digit 574 if (strlen(s) > 1) { 575 return false; 576 } 577 switch (*s) { 578 case 'T': case 't': 579 *result = n * G * K; 580 // Check for overflow. 581 if (*result/((julong)G * K) != n) return false; 582 return true; 583 case 'G': case 'g': 584 *result = n * G; 585 if (*result/G != n) return false; 586 return true; 587 case 'M': case 'm': 588 *result = n * M; 589 if (*result/M != n) return false; 590 return true; 591 case 'K': case 'k': 592 *result = n * K; 593 if (*result/K != n) return false; 594 return true; 595 case '\0': 596 *result = n; 597 return true; 598 default: 599 return false; 600 } 601} 602 603Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 604 if (size < min_size) return arg_too_small; 605 // Check that size will fit in a size_t (only relevant on 32-bit) 606 if (size > max_uintx) return arg_too_big; 607 return arg_in_range; 608} 609 610// Describe an argument out of range error 611void Arguments::describe_range_error(ArgsRange errcode) { 612 switch(errcode) { 613 case arg_too_big: 614 jio_fprintf(defaultStream::error_stream(), 615 "The specified size exceeds the maximum " 616 "representable size.\n"); 617 break; 618 case arg_too_small: 619 case arg_unreadable: 620 case arg_in_range: 621 // do nothing for now 622 break; 623 default: 624 ShouldNotReachHere(); 625 } 626} 627 628static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) { 629 return CommandLineFlags::boolAtPut(name, &value, origin); 630} 631 632static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 633 double v; 634 if (sscanf(value, "%lf", &v) != 1) { 635 return false; 636 } 637 638 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 639 return true; 640 } 641 return false; 642} 643 644static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 645 julong v; 646 intx intx_v; 647 bool is_neg = false; 648 // Check the sign first since atomull() parses only unsigned values. 649 if (*value == '-') { 650 if (!CommandLineFlags::intxAt(name, &intx_v)) { 651 return false; 652 } 653 value++; 654 is_neg = true; 655 } 656 if (!atomull(value, &v)) { 657 return false; 658 } 659 intx_v = (intx) v; 660 if (is_neg) { 661 intx_v = -intx_v; 662 } 663 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 664 return true; 665 } 666 uintx uintx_v = (uintx) v; 667 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 668 return true; 669 } 670 uint64_t uint64_t_v = (uint64_t) v; 671 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 672 return true; 673 } 674 return false; 675} 676 677static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) { 678 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 679 // Contract: CommandLineFlags always returns a pointer that needs freeing. 680 FREE_C_HEAP_ARRAY(char, value, mtInternal); 681 return true; 682} 683 684static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) { 685 const char* old_value = ""; 686 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 687 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 688 size_t new_len = strlen(new_value); 689 const char* value; 690 char* free_this_too = NULL; 691 if (old_len == 0) { 692 value = new_value; 693 } else if (new_len == 0) { 694 value = old_value; 695 } else { 696 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 697 // each new setting adds another LINE to the switch: 698 sprintf(buf, "%s\n%s", old_value, new_value); 699 value = buf; 700 free_this_too = buf; 701 } 702 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 703 // CommandLineFlags always returns a pointer that needs freeing. 704 FREE_C_HEAP_ARRAY(char, value, mtInternal); 705 if (free_this_too != NULL) { 706 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 707 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 708 } 709 return true; 710} 711 712bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) { 713 714 // range of acceptable characters spelled out for portability reasons 715#define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 716#define BUFLEN 255 717 char name[BUFLEN+1]; 718 char dummy; 719 720 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 721 return set_bool_flag(name, false, origin); 722 } 723 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 724 return set_bool_flag(name, true, origin); 725 } 726 727 char punct; 728 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 729 const char* value = strchr(arg, '=') + 1; 730 Flag* flag = Flag::find_flag(name, strlen(name)); 731 if (flag != NULL && flag->is_ccstr()) { 732 if (flag->ccstr_accumulates()) { 733 return append_to_string_flag(name, value, origin); 734 } else { 735 if (value[0] == '\0') { 736 value = NULL; 737 } 738 return set_string_flag(name, value, origin); 739 } 740 } 741 } 742 743 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 744 const char* value = strchr(arg, '=') + 1; 745 // -XX:Foo:=xxx will reset the string flag to the given value. 746 if (value[0] == '\0') { 747 value = NULL; 748 } 749 return set_string_flag(name, value, origin); 750 } 751 752#define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 753#define SIGNED_NUMBER_RANGE "[-0123456789]" 754#define NUMBER_RANGE "[0123456789]" 755 char value[BUFLEN + 1]; 756 char value2[BUFLEN + 1]; 757 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 758 // Looks like a floating-point number -- try again with more lenient format string 759 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 760 return set_fp_numeric_flag(name, value, origin); 761 } 762 } 763 764#define VALUE_RANGE "[-kmgtKMGT0123456789]" 765 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 766 return set_numeric_flag(name, value, origin); 767 } 768 769 return false; 770} 771 772void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 773 assert(bldarray != NULL, "illegal argument"); 774 775 if (arg == NULL) { 776 return; 777 } 778 779 int new_count = *count + 1; 780 781 // expand the array and add arg to the last element 782 if (*bldarray == NULL) { 783 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 784 } else { 785 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 786 } 787 (*bldarray)[*count] = strdup(arg); 788 *count = new_count; 789} 790 791void Arguments::build_jvm_args(const char* arg) { 792 add_string(&_jvm_args_array, &_num_jvm_args, arg); 793} 794 795void Arguments::build_jvm_flags(const char* arg) { 796 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 797} 798 799// utility function to return a string that concatenates all 800// strings in a given char** array 801const char* Arguments::build_resource_string(char** args, int count) { 802 if (args == NULL || count == 0) { 803 return NULL; 804 } 805 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 806 for (int i = 1; i < count; i++) { 807 length += strlen(args[i]) + 1; // add 1 for a space 808 } 809 char* s = NEW_RESOURCE_ARRAY(char, length); 810 strcpy(s, args[0]); 811 for (int j = 1; j < count; j++) { 812 strcat(s, " "); 813 strcat(s, args[j]); 814 } 815 return (const char*) s; 816} 817 818void Arguments::print_on(outputStream* st) { 819 st->print_cr("VM Arguments:"); 820 if (num_jvm_flags() > 0) { 821 st->print("jvm_flags: "); print_jvm_flags_on(st); 822 } 823 if (num_jvm_args() > 0) { 824 st->print("jvm_args: "); print_jvm_args_on(st); 825 } 826 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 827 if (_java_class_path != NULL) { 828 char* path = _java_class_path->value(); 829 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 830 } 831 st->print_cr("Launcher Type: %s", _sun_java_launcher); 832} 833 834void Arguments::print_jvm_flags_on(outputStream* st) { 835 if (_num_jvm_flags > 0) { 836 for (int i=0; i < _num_jvm_flags; i++) { 837 st->print("%s ", _jvm_flags_array[i]); 838 } 839 st->print_cr(""); 840 } 841} 842 843void Arguments::print_jvm_args_on(outputStream* st) { 844 if (_num_jvm_args > 0) { 845 for (int i=0; i < _num_jvm_args; i++) { 846 st->print("%s ", _jvm_args_array[i]); 847 } 848 st->print_cr(""); 849 } 850} 851 852bool Arguments::process_argument(const char* arg, 853 jboolean ignore_unrecognized, FlagValueOrigin origin) { 854 855 JDK_Version since = JDK_Version(); 856 857 if (parse_argument(arg, origin) || ignore_unrecognized) { 858 return true; 859 } 860 861 bool has_plus_minus = (*arg == '+' || *arg == '-'); 862 const char* const argname = has_plus_minus ? arg + 1 : arg; 863 if (is_newly_obsolete(arg, &since)) { 864 char version[256]; 865 since.to_string(version, sizeof(version)); 866 warning("ignoring option %s; support was removed in %s", argname, version); 867 return true; 868 } 869 870 // For locked flags, report a custom error message if available. 871 // Otherwise, report the standard unrecognized VM option. 872 873 size_t arg_len; 874 const char* equal_sign = strchr(argname, '='); 875 if (equal_sign == NULL) { 876 arg_len = strlen(argname); 877 } else { 878 arg_len = equal_sign - argname; 879 } 880 881 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true); 882 if (found_flag != NULL) { 883 char locked_message_buf[BUFLEN]; 884 found_flag->get_locked_message(locked_message_buf, BUFLEN); 885 if (strlen(locked_message_buf) == 0) { 886 if (found_flag->is_bool() && !has_plus_minus) { 887 jio_fprintf(defaultStream::error_stream(), 888 "Missing +/- setting for VM option '%s'\n", argname); 889 } else if (!found_flag->is_bool() && has_plus_minus) { 890 jio_fprintf(defaultStream::error_stream(), 891 "Unexpected +/- setting in VM option '%s'\n", argname); 892 } else { 893 jio_fprintf(defaultStream::error_stream(), 894 "Improperly specified VM option '%s'\n", argname); 895 } 896 } else { 897 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 898 } 899 } else { 900 jio_fprintf(defaultStream::error_stream(), 901 "Unrecognized VM option '%s'\n", argname); 902 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 903 if (fuzzy_matched != NULL) { 904 jio_fprintf(defaultStream::error_stream(), 905 "Did you mean '%s%s%s'?\n", 906 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 907 fuzzy_matched->name, 908 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 909 } 910 } 911 912 // allow for commandline "commenting out" options like -XX:#+Verbose 913 return arg[0] == '#'; 914} 915 916bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 917 FILE* stream = fopen(file_name, "rb"); 918 if (stream == NULL) { 919 if (should_exist) { 920 jio_fprintf(defaultStream::error_stream(), 921 "Could not open settings file %s\n", file_name); 922 return false; 923 } else { 924 return true; 925 } 926 } 927 928 char token[1024]; 929 int pos = 0; 930 931 bool in_white_space = true; 932 bool in_comment = false; 933 bool in_quote = false; 934 char quote_c = 0; 935 bool result = true; 936 937 int c = getc(stream); 938 while(c != EOF && pos < (int)(sizeof(token)-1)) { 939 if (in_white_space) { 940 if (in_comment) { 941 if (c == '\n') in_comment = false; 942 } else { 943 if (c == '#') in_comment = true; 944 else if (!isspace(c)) { 945 in_white_space = false; 946 token[pos++] = c; 947 } 948 } 949 } else { 950 if (c == '\n' || (!in_quote && isspace(c))) { 951 // token ends at newline, or at unquoted whitespace 952 // this allows a way to include spaces in string-valued options 953 token[pos] = '\0'; 954 logOption(token); 955 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 956 build_jvm_flags(token); 957 pos = 0; 958 in_white_space = true; 959 in_quote = false; 960 } else if (!in_quote && (c == '\'' || c == '"')) { 961 in_quote = true; 962 quote_c = c; 963 } else if (in_quote && (c == quote_c)) { 964 in_quote = false; 965 } else { 966 token[pos++] = c; 967 } 968 } 969 c = getc(stream); 970 } 971 if (pos > 0) { 972 token[pos] = '\0'; 973 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 974 build_jvm_flags(token); 975 } 976 fclose(stream); 977 return result; 978} 979 980//============================================================================================================= 981// Parsing of properties (-D) 982 983const char* Arguments::get_property(const char* key) { 984 return PropertyList_get_value(system_properties(), key); 985} 986 987bool Arguments::add_property(const char* prop) { 988 const char* eq = strchr(prop, '='); 989 char* key; 990 // ns must be static--its address may be stored in a SystemProperty object. 991 const static char ns[1] = {0}; 992 char* value = (char *)ns; 993 994 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 995 key = AllocateHeap(key_len + 1, mtInternal); 996 strncpy(key, prop, key_len); 997 key[key_len] = '\0'; 998 999 if (eq != NULL) { 1000 size_t value_len = strlen(prop) - key_len - 1; 1001 value = AllocateHeap(value_len + 1, mtInternal); 1002 strncpy(value, &prop[key_len + 1], value_len + 1); 1003 } 1004 1005 if (strcmp(key, "java.compiler") == 0) { 1006 process_java_compiler_argument(value); 1007 FreeHeap(key); 1008 if (eq != NULL) { 1009 FreeHeap(value); 1010 } 1011 return true; 1012 } else if (strcmp(key, "sun.java.command") == 0) { 1013 _java_command = value; 1014 1015 // Record value in Arguments, but let it get passed to Java. 1016 } else if (strcmp(key, "sun.java.launcher.pid") == 0) { 1017 // launcher.pid property is private and is processed 1018 // in process_sun_java_launcher_properties(); 1019 // the sun.java.launcher property is passed on to the java application 1020 FreeHeap(key); 1021 if (eq != NULL) { 1022 FreeHeap(value); 1023 } 1024 return true; 1025 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1026 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1027 // its value without going through the property list or making a Java call. 1028 _java_vendor_url_bug = value; 1029 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1030 PropertyList_unique_add(&_system_properties, key, value, true); 1031 return true; 1032 } 1033 // Create new property and add at the end of the list 1034 PropertyList_unique_add(&_system_properties, key, value); 1035 return true; 1036} 1037 1038//=========================================================================================================== 1039// Setting int/mixed/comp mode flags 1040 1041void Arguments::set_mode_flags(Mode mode) { 1042 // Set up default values for all flags. 1043 // If you add a flag to any of the branches below, 1044 // add a default value for it here. 1045 set_java_compiler(false); 1046 _mode = mode; 1047 1048 // Ensure Agent_OnLoad has the correct initial values. 1049 // This may not be the final mode; mode may change later in onload phase. 1050 PropertyList_unique_add(&_system_properties, "java.vm.info", 1051 (char*)VM_Version::vm_info_string(), false); 1052 1053 UseInterpreter = true; 1054 UseCompiler = true; 1055 UseLoopCounter = true; 1056 1057#ifndef ZERO 1058 // Turn these off for mixed and comp. Leave them on for Zero. 1059 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) { 1060 UseFastAccessorMethods = (mode == _int); 1061 } 1062 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) { 1063 UseFastEmptyMethods = (mode == _int); 1064 } 1065#endif 1066 1067 // Default values may be platform/compiler dependent - 1068 // use the saved values 1069 ClipInlining = Arguments::_ClipInlining; 1070 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1071 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1072 BackgroundCompilation = Arguments::_BackgroundCompilation; 1073 1074 // Change from defaults based on mode 1075 switch (mode) { 1076 default: 1077 ShouldNotReachHere(); 1078 break; 1079 case _int: 1080 UseCompiler = false; 1081 UseLoopCounter = false; 1082 AlwaysCompileLoopMethods = false; 1083 UseOnStackReplacement = false; 1084 break; 1085 case _mixed: 1086 // same as default 1087 break; 1088 case _comp: 1089 UseInterpreter = false; 1090 BackgroundCompilation = false; 1091 ClipInlining = false; 1092 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1093 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1094 // compile a level 4 (C2) and then continue executing it. 1095 if (TieredCompilation) { 1096 Tier3InvokeNotifyFreqLog = 0; 1097 Tier4InvocationThreshold = 0; 1098 } 1099 break; 1100 } 1101} 1102 1103// Conflict: required to use shared spaces (-Xshare:on), but 1104// incompatible command line options were chosen. 1105 1106static void no_shared_spaces() { 1107 if (RequireSharedSpaces) { 1108 jio_fprintf(defaultStream::error_stream(), 1109 "Class data sharing is inconsistent with other specified options.\n"); 1110 vm_exit_during_initialization("Unable to use shared archive.", NULL); 1111 } else { 1112 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1113 } 1114} 1115 1116void Arguments::set_tiered_flags() { 1117 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1118 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1119 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1120 } 1121 if (CompilationPolicyChoice < 2) { 1122 vm_exit_during_initialization( 1123 "Incompatible compilation policy selected", NULL); 1124 } 1125 // Increase the code cache size - tiered compiles a lot more. 1126 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1127 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5); 1128 } 1129 if (!UseInterpreter) { // -Xcomp 1130 Tier3InvokeNotifyFreqLog = 0; 1131 Tier4InvocationThreshold = 0; 1132 } 1133} 1134 1135#if INCLUDE_ALL_GCS 1136static void disable_adaptive_size_policy(const char* collector_name) { 1137 if (UseAdaptiveSizePolicy) { 1138 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1139 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1140 collector_name); 1141 } 1142 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1143 } 1144} 1145 1146void Arguments::set_parnew_gc_flags() { 1147 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1148 "control point invariant"); 1149 assert(UseParNewGC, "Error"); 1150 1151 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1152 disable_adaptive_size_policy("UseParNewGC"); 1153 1154 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1155 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1156 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1157 } else if (ParallelGCThreads == 0) { 1158 jio_fprintf(defaultStream::error_stream(), 1159 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1160 vm_exit(1); 1161 } 1162 1163 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1164 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1165 // we set them to 1024 and 1024. 1166 // See CR 6362902. 1167 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1168 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1169 } 1170 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1171 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1172 } 1173 1174 // AlwaysTenure flag should make ParNew promote all at first collection. 1175 // See CR 6362902. 1176 if (AlwaysTenure) { 1177 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 1178 } 1179 // When using compressed oops, we use local overflow stacks, 1180 // rather than using a global overflow list chained through 1181 // the klass word of the object's pre-image. 1182 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1183 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1184 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1185 } 1186 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1187 } 1188 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1189} 1190 1191// Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1192// sparc/solaris for certain applications, but would gain from 1193// further optimization and tuning efforts, and would almost 1194// certainly gain from analysis of platform and environment. 1195void Arguments::set_cms_and_parnew_gc_flags() { 1196 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1197 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1198 1199 // If we are using CMS, we prefer to UseParNewGC, 1200 // unless explicitly forbidden. 1201 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1202 FLAG_SET_ERGO(bool, UseParNewGC, true); 1203 } 1204 1205 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1206 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1207 1208 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1209 // as needed. 1210 if (UseParNewGC) { 1211 set_parnew_gc_flags(); 1212 } 1213 1214 size_t max_heap = align_size_down(MaxHeapSize, 1215 CardTableRS::ct_max_alignment_constraint()); 1216 1217 // Now make adjustments for CMS 1218 intx tenuring_default = (intx)6; 1219 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1220 1221 // Preferred young gen size for "short" pauses: 1222 // upper bound depends on # of threads and NewRatio. 1223 const uintx parallel_gc_threads = 1224 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1225 const size_t preferred_max_new_size_unaligned = 1226 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1227 size_t preferred_max_new_size = 1228 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1229 1230 // Unless explicitly requested otherwise, size young gen 1231 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1232 1233 // If either MaxNewSize or NewRatio is set on the command line, 1234 // assume the user is trying to set the size of the young gen. 1235 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1236 1237 // Set MaxNewSize to our calculated preferred_max_new_size unless 1238 // NewSize was set on the command line and it is larger than 1239 // preferred_max_new_size. 1240 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1241 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1242 } else { 1243 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1244 } 1245 if (PrintGCDetails && Verbose) { 1246 // Too early to use gclog_or_tty 1247 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1248 } 1249 1250 // Code along this path potentially sets NewSize and OldSize 1251 if (PrintGCDetails && Verbose) { 1252 // Too early to use gclog_or_tty 1253 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1254 " initial_heap_size: " SIZE_FORMAT 1255 " max_heap: " SIZE_FORMAT, 1256 min_heap_size(), InitialHeapSize, max_heap); 1257 } 1258 size_t min_new = preferred_max_new_size; 1259 if (FLAG_IS_CMDLINE(NewSize)) { 1260 min_new = NewSize; 1261 } 1262 if (max_heap > min_new && min_heap_size() > min_new) { 1263 // Unless explicitly requested otherwise, make young gen 1264 // at least min_new, and at most preferred_max_new_size. 1265 if (FLAG_IS_DEFAULT(NewSize)) { 1266 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1267 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1268 if (PrintGCDetails && Verbose) { 1269 // Too early to use gclog_or_tty 1270 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1271 } 1272 } 1273 // Unless explicitly requested otherwise, size old gen 1274 // so it's NewRatio x of NewSize. 1275 if (FLAG_IS_DEFAULT(OldSize)) { 1276 if (max_heap > NewSize) { 1277 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1278 if (PrintGCDetails && Verbose) { 1279 // Too early to use gclog_or_tty 1280 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1281 } 1282 } 1283 } 1284 } 1285 } 1286 // Unless explicitly requested otherwise, definitely 1287 // promote all objects surviving "tenuring_default" scavenges. 1288 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1289 FLAG_IS_DEFAULT(SurvivorRatio)) { 1290 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1291 } 1292 // If we decided above (or user explicitly requested) 1293 // `promote all' (via MaxTenuringThreshold := 0), 1294 // prefer minuscule survivor spaces so as not to waste 1295 // space for (non-existent) survivors 1296 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1297 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1298 } 1299 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1300 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1301 // This is done in order to make ParNew+CMS configuration to work 1302 // with YoungPLABSize and OldPLABSize options. 1303 // See CR 6362902. 1304 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1305 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1306 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1307 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1308 // the value (either from the command line or ergonomics) of 1309 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1310 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1311 } else { 1312 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1313 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1314 // we'll let it to take precedence. 1315 jio_fprintf(defaultStream::error_stream(), 1316 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1317 " options are specified for the CMS collector." 1318 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1319 } 1320 } 1321 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1322 // OldPLAB sizing manually turned off: Use a larger default setting, 1323 // unless it was manually specified. This is because a too-low value 1324 // will slow down scavenges. 1325 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1326 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1327 } 1328 } 1329 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1330 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1331 // If either of the static initialization defaults have changed, note this 1332 // modification. 1333 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1334 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1335 } 1336 if (PrintGCDetails && Verbose) { 1337 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1338 MarkStackSize / K, MarkStackSizeMax / K); 1339 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1340 } 1341} 1342#endif // INCLUDE_ALL_GCS 1343 1344void set_object_alignment() { 1345 // Object alignment. 1346 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1347 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1348 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1349 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1350 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1351 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1352 1353 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1354 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1355 1356 // Oop encoding heap max 1357 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1358 1359#if INCLUDE_ALL_GCS 1360 // Set CMS global values 1361 CompactibleFreeListSpace::set_cms_values(); 1362#endif // INCLUDE_ALL_GCS 1363} 1364 1365bool verify_object_alignment() { 1366 // Object alignment. 1367 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1368 jio_fprintf(defaultStream::error_stream(), 1369 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1370 (int)ObjectAlignmentInBytes); 1371 return false; 1372 } 1373 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1374 jio_fprintf(defaultStream::error_stream(), 1375 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1376 (int)ObjectAlignmentInBytes, BytesPerLong); 1377 return false; 1378 } 1379 // It does not make sense to have big object alignment 1380 // since a space lost due to alignment will be greater 1381 // then a saved space from compressed oops. 1382 if ((int)ObjectAlignmentInBytes > 256) { 1383 jio_fprintf(defaultStream::error_stream(), 1384 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1385 (int)ObjectAlignmentInBytes); 1386 return false; 1387 } 1388 // In case page size is very small. 1389 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1390 jio_fprintf(defaultStream::error_stream(), 1391 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1392 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1393 return false; 1394 } 1395 return true; 1396} 1397 1398uintx Arguments::max_heap_for_compressed_oops() { 1399 // Avoid sign flip. 1400 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1401 // We need to fit both the NULL page and the heap into the memory budget, while 1402 // keeping alignment constraints of the heap. To guarantee the latter, as the 1403 // NULL page is located before the heap, we pad the NULL page to the conservative 1404 // maximum alignment that the GC may ever impose upon the heap. 1405 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1406 Arguments::conservative_max_heap_alignment()); 1407 1408 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1409 NOT_LP64(ShouldNotReachHere(); return 0); 1410} 1411 1412bool Arguments::should_auto_select_low_pause_collector() { 1413 if (UseAutoGCSelectPolicy && 1414 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1415 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1416 if (PrintGCDetails) { 1417 // Cannot use gclog_or_tty yet. 1418 tty->print_cr("Automatic selection of the low pause collector" 1419 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1420 } 1421 return true; 1422 } 1423 return false; 1424} 1425 1426void Arguments::set_use_compressed_oops() { 1427#ifndef ZERO 1428#ifdef _LP64 1429 // MaxHeapSize is not set up properly at this point, but 1430 // the only value that can override MaxHeapSize if we are 1431 // to use UseCompressedOops is InitialHeapSize. 1432 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1433 1434 if (max_heap_size <= max_heap_for_compressed_oops()) { 1435#if !defined(COMPILER1) || defined(TIERED) 1436 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1437 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1438 } 1439#endif 1440#ifdef _WIN64 1441 if (UseLargePages && UseCompressedOops) { 1442 // Cannot allocate guard pages for implicit checks in indexed addressing 1443 // mode, when large pages are specified on windows. 1444 // This flag could be switched ON if narrow oop base address is set to 0, 1445 // see code in Universe::initialize_heap(). 1446 Universe::set_narrow_oop_use_implicit_null_checks(false); 1447 } 1448#endif // _WIN64 1449 } else { 1450 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1451 warning("Max heap size too large for Compressed Oops"); 1452 FLAG_SET_DEFAULT(UseCompressedOops, false); 1453 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1454 } 1455 } 1456#endif // _LP64 1457#endif // ZERO 1458} 1459 1460 1461// NOTE: set_use_compressed_klass_ptrs() must be called after calling 1462// set_use_compressed_oops(). 1463void Arguments::set_use_compressed_klass_ptrs() { 1464#ifndef ZERO 1465#ifdef _LP64 1466 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1467 if (!UseCompressedOops) { 1468 if (UseCompressedClassPointers) { 1469 warning("UseCompressedClassPointers requires UseCompressedOops"); 1470 } 1471 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1472 } else { 1473 // Turn on UseCompressedClassPointers too 1474 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1475 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1476 } 1477 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1478 if (UseCompressedClassPointers) { 1479 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1480 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1481 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1482 } 1483 } 1484 } 1485#endif // _LP64 1486#endif // !ZERO 1487} 1488 1489void Arguments::set_conservative_max_heap_alignment() { 1490 // The conservative maximum required alignment for the heap is the maximum of 1491 // the alignments imposed by several sources: any requirements from the heap 1492 // itself, the collector policy and the maximum page size we may run the VM 1493 // with. 1494 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1495#if INCLUDE_ALL_GCS 1496 if (UseParallelGC) { 1497 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1498 } else if (UseG1GC) { 1499 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1500 } 1501#endif // INCLUDE_ALL_GCS 1502 _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(), 1503 CollectorPolicy::compute_max_alignment()); 1504} 1505 1506void Arguments::set_ergonomics_flags() { 1507 1508 if (os::is_server_class_machine()) { 1509 // If no other collector is requested explicitly, 1510 // let the VM select the collector based on 1511 // machine class and automatic selection policy. 1512 if (!UseSerialGC && 1513 !UseConcMarkSweepGC && 1514 !UseG1GC && 1515 !UseParNewGC && 1516 FLAG_IS_DEFAULT(UseParallelGC)) { 1517 if (should_auto_select_low_pause_collector()) { 1518 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1519 } else { 1520 FLAG_SET_ERGO(bool, UseParallelGC, true); 1521 } 1522 } 1523 // Shared spaces work fine with other GCs but causes bytecode rewriting 1524 // to be disabled, which hurts interpreter performance and decreases 1525 // server performance. On server class machines, keep the default 1526 // off unless it is asked for. Future work: either add bytecode rewriting 1527 // at link time, or rewrite bytecodes in non-shared methods. 1528 if (!DumpSharedSpaces && !RequireSharedSpaces && 1529 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1530 no_shared_spaces(); 1531 } 1532 } 1533 1534 set_conservative_max_heap_alignment(); 1535 1536#ifndef ZERO 1537#ifdef _LP64 1538 set_use_compressed_oops(); 1539 1540 // set_use_compressed_klass_ptrs() must be called after calling 1541 // set_use_compressed_oops(). 1542 set_use_compressed_klass_ptrs(); 1543 1544 // Also checks that certain machines are slower with compressed oops 1545 // in vm_version initialization code. 1546#endif // _LP64 1547#endif // !ZERO 1548} 1549 1550void Arguments::set_parallel_gc_flags() { 1551 assert(UseParallelGC || UseParallelOldGC, "Error"); 1552 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1553 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1554 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1555 } 1556 FLAG_SET_DEFAULT(UseParallelGC, true); 1557 1558 // If no heap maximum was requested explicitly, use some reasonable fraction 1559 // of the physical memory, up to a maximum of 1GB. 1560 FLAG_SET_DEFAULT(ParallelGCThreads, 1561 Abstract_VM_Version::parallel_worker_threads()); 1562 if (ParallelGCThreads == 0) { 1563 jio_fprintf(defaultStream::error_stream(), 1564 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1565 vm_exit(1); 1566 } 1567 1568 1569 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1570 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1571 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1572 // See CR 6362902 for details. 1573 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1574 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1575 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1576 } 1577 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1578 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1579 } 1580 } 1581 1582 if (UseParallelOldGC) { 1583 // Par compact uses lower default values since they are treated as 1584 // minimums. These are different defaults because of the different 1585 // interpretation and are not ergonomically set. 1586 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1587 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1588 } 1589 } 1590} 1591 1592void Arguments::set_g1_gc_flags() { 1593 assert(UseG1GC, "Error"); 1594#ifdef COMPILER1 1595 FastTLABRefill = false; 1596#endif 1597 FLAG_SET_DEFAULT(ParallelGCThreads, 1598 Abstract_VM_Version::parallel_worker_threads()); 1599 if (ParallelGCThreads == 0) { 1600 FLAG_SET_DEFAULT(ParallelGCThreads, 1601 Abstract_VM_Version::parallel_worker_threads()); 1602 } 1603 1604 // MarkStackSize will be set (if it hasn't been set by the user) 1605 // when concurrent marking is initialized. 1606 // Its value will be based upon the number of parallel marking threads. 1607 // But we do set the maximum mark stack size here. 1608 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1609 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1610 } 1611 1612 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1613 // In G1, we want the default GC overhead goal to be higher than 1614 // say in PS. So we set it here to 10%. Otherwise the heap might 1615 // be expanded more aggressively than we would like it to. In 1616 // fact, even 10% seems to not be high enough in some cases 1617 // (especially small GC stress tests that the main thing they do 1618 // is allocation). We might consider increase it further. 1619 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1620 } 1621 1622 if (PrintGCDetails && Verbose) { 1623 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1624 MarkStackSize / K, MarkStackSizeMax / K); 1625 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1626 } 1627} 1628 1629julong Arguments::limit_by_allocatable_memory(julong limit) { 1630 julong max_allocatable; 1631 julong result = limit; 1632 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1633 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1634 } 1635 return result; 1636} 1637 1638void Arguments::set_heap_size() { 1639 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1640 // Deprecated flag 1641 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1642 } 1643 1644 const julong phys_mem = 1645 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1646 : (julong)MaxRAM; 1647 1648 // If the maximum heap size has not been set with -Xmx, 1649 // then set it as fraction of the size of physical memory, 1650 // respecting the maximum and minimum sizes of the heap. 1651 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1652 julong reasonable_max = phys_mem / MaxRAMFraction; 1653 1654 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1655 // Small physical memory, so use a minimum fraction of it for the heap 1656 reasonable_max = phys_mem / MinRAMFraction; 1657 } else { 1658 // Not-small physical memory, so require a heap at least 1659 // as large as MaxHeapSize 1660 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1661 } 1662 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1663 // Limit the heap size to ErgoHeapSizeLimit 1664 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1665 } 1666 if (UseCompressedOops) { 1667 // Limit the heap size to the maximum possible when using compressed oops 1668 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1669 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1670 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1671 // but it should be not less than default MaxHeapSize. 1672 max_coop_heap -= HeapBaseMinAddress; 1673 } 1674 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1675 } 1676 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1677 1678 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1679 // An initial heap size was specified on the command line, 1680 // so be sure that the maximum size is consistent. Done 1681 // after call to limit_by_allocatable_memory because that 1682 // method might reduce the allocation size. 1683 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1684 } 1685 1686 if (PrintGCDetails && Verbose) { 1687 // Cannot use gclog_or_tty yet. 1688 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1689 } 1690 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1691 } 1692 1693 // If the minimum or initial heap_size have not been set or requested to be set 1694 // ergonomically, set them accordingly. 1695 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1696 julong reasonable_minimum = (julong)(OldSize + NewSize); 1697 1698 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1699 1700 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1701 1702 if (InitialHeapSize == 0) { 1703 julong reasonable_initial = phys_mem / InitialRAMFraction; 1704 1705 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1706 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1707 1708 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1709 1710 if (PrintGCDetails && Verbose) { 1711 // Cannot use gclog_or_tty yet. 1712 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1713 } 1714 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1715 } 1716 // If the minimum heap size has not been set (via -Xms), 1717 // synchronize with InitialHeapSize to avoid errors with the default value. 1718 if (min_heap_size() == 0) { 1719 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1720 if (PrintGCDetails && Verbose) { 1721 // Cannot use gclog_or_tty yet. 1722 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1723 } 1724 } 1725 } 1726} 1727 1728// This must be called after ergonomics because we want bytecode rewriting 1729// if the server compiler is used, or if UseSharedSpaces is disabled. 1730void Arguments::set_bytecode_flags() { 1731 // Better not attempt to store into a read-only space. 1732 if (UseSharedSpaces) { 1733 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1734 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1735 } 1736 1737 if (!RewriteBytecodes) { 1738 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1739 } 1740} 1741 1742// Aggressive optimization flags -XX:+AggressiveOpts 1743void Arguments::set_aggressive_opts_flags() { 1744#ifdef COMPILER2 1745 if (AggressiveUnboxing) { 1746 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1747 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1748 } else if (!EliminateAutoBox) { 1749 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1750 AggressiveUnboxing = false; 1751 } 1752 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1753 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1754 } else if (!DoEscapeAnalysis) { 1755 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1756 AggressiveUnboxing = false; 1757 } 1758 } 1759 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1760 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1761 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1762 } 1763 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1764 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1765 } 1766 1767 // Feed the cache size setting into the JDK 1768 char buffer[1024]; 1769 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1770 add_property(buffer); 1771 } 1772 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1773 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1774 } 1775#endif 1776 1777 if (AggressiveOpts) { 1778// Sample flag setting code 1779// if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1780// FLAG_SET_DEFAULT(EliminateZeroing, true); 1781// } 1782 } 1783} 1784 1785//=========================================================================================================== 1786// Parsing of java.compiler property 1787 1788void Arguments::process_java_compiler_argument(char* arg) { 1789 // For backwards compatibility, Djava.compiler=NONE or "" 1790 // causes us to switch to -Xint mode UNLESS -Xdebug 1791 // is also specified. 1792 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1793 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1794 } 1795} 1796 1797void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1798 _sun_java_launcher = strdup(launcher); 1799 if (strcmp("gamma", _sun_java_launcher) == 0) { 1800 _created_by_gamma_launcher = true; 1801 } 1802} 1803 1804bool Arguments::created_by_java_launcher() { 1805 assert(_sun_java_launcher != NULL, "property must have value"); 1806 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1807} 1808 1809bool Arguments::created_by_gamma_launcher() { 1810 return _created_by_gamma_launcher; 1811} 1812 1813//=========================================================================================================== 1814// Parsing of main arguments 1815 1816bool Arguments::verify_interval(uintx val, uintx min, 1817 uintx max, const char* name) { 1818 // Returns true iff value is in the inclusive interval [min..max] 1819 // false, otherwise. 1820 if (val >= min && val <= max) { 1821 return true; 1822 } 1823 jio_fprintf(defaultStream::error_stream(), 1824 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1825 " and " UINTX_FORMAT "\n", 1826 name, val, min, max); 1827 return false; 1828} 1829 1830bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1831 // Returns true if given value is at least specified min threshold 1832 // false, otherwise. 1833 if (val >= min ) { 1834 return true; 1835 } 1836 jio_fprintf(defaultStream::error_stream(), 1837 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1838 name, val, min); 1839 return false; 1840} 1841 1842bool Arguments::verify_percentage(uintx value, const char* name) { 1843 if (value <= 100) { 1844 return true; 1845 } 1846 jio_fprintf(defaultStream::error_stream(), 1847 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1848 name, value); 1849 return false; 1850} 1851 1852#if !INCLUDE_ALL_GCS 1853#ifdef ASSERT 1854static bool verify_serial_gc_flags() { 1855 return (UseSerialGC && 1856 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1857 UseParallelGC || UseParallelOldGC)); 1858} 1859#endif // ASSERT 1860#endif // INCLUDE_ALL_GCS 1861 1862// check if do gclog rotation 1863// +UseGCLogFileRotation is a must, 1864// no gc log rotation when log file not supplied or 1865// NumberOfGCLogFiles is 0, or GCLogFileSize is 0 1866void check_gclog_consistency() { 1867 if (UseGCLogFileRotation) { 1868 if ((Arguments::gc_log_filename() == NULL) || 1869 (NumberOfGCLogFiles == 0) || 1870 (GCLogFileSize == 0)) { 1871 jio_fprintf(defaultStream::output_stream(), 1872 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n" 1873 "where num_of_file > 0 and num_of_size > 0\n" 1874 "GC log rotation is turned off\n"); 1875 UseGCLogFileRotation = false; 1876 } 1877 } 1878 1879 if (UseGCLogFileRotation && GCLogFileSize < 8*K) { 1880 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1881 jio_fprintf(defaultStream::output_stream(), 1882 "GCLogFileSize changed to minimum 8K\n"); 1883 } 1884} 1885 1886// Check consistency of GC selection 1887bool Arguments::check_gc_consistency() { 1888 check_gclog_consistency(); 1889 bool status = true; 1890 // Ensure that the user has not selected conflicting sets 1891 // of collectors. [Note: this check is merely a user convenience; 1892 // collectors over-ride each other so that only a non-conflicting 1893 // set is selected; however what the user gets is not what they 1894 // may have expected from the combination they asked for. It's 1895 // better to reduce user confusion by not allowing them to 1896 // select conflicting combinations. 1897 uint i = 0; 1898 if (UseSerialGC) i++; 1899 if (UseConcMarkSweepGC || UseParNewGC) i++; 1900 if (UseParallelGC || UseParallelOldGC) i++; 1901 if (UseG1GC) i++; 1902 if (i > 1) { 1903 jio_fprintf(defaultStream::error_stream(), 1904 "Conflicting collector combinations in option list; " 1905 "please refer to the release notes for the combinations " 1906 "allowed\n"); 1907 status = false; 1908 } else if (ReservedCodeCacheSize > 2*G) { 1909 // Code cache size larger than MAXINT is not supported. 1910 jio_fprintf(defaultStream::error_stream(), 1911 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 1912 (2*G)/M); 1913 status = false; 1914 } 1915 return status; 1916} 1917 1918void Arguments::check_deprecated_gcs() { 1919 if (UseConcMarkSweepGC && !UseParNewGC) { 1920 warning("Using the DefNew young collector with the CMS collector is deprecated " 1921 "and will likely be removed in a future release"); 1922 } 1923 1924 if (UseParNewGC && !UseConcMarkSweepGC) { 1925 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 1926 // set up UseSerialGC properly, so that can't be used in the check here. 1927 warning("Using the ParNew young collector with the Serial old collector is deprecated " 1928 "and will likely be removed in a future release"); 1929 } 1930 1931 if (CMSIncrementalMode) { 1932 warning("Using incremental CMS is deprecated and will likely be removed in a future release"); 1933 } 1934} 1935 1936void Arguments::check_deprecated_gc_flags() { 1937 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 1938 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 1939 "and will likely be removed in future release"); 1940 } 1941 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 1942 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 1943 "Use MaxRAMFraction instead."); 1944 } 1945} 1946 1947// Check stack pages settings 1948bool Arguments::check_stack_pages() 1949{ 1950 bool status = true; 1951 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 1952 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 1953 // greater stack shadow pages can't generate instruction to bang stack 1954 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 1955 return status; 1956} 1957 1958// Check the consistency of vm_init_args 1959bool Arguments::check_vm_args_consistency() { 1960 // Method for adding checks for flag consistency. 1961 // The intent is to warn the user of all possible conflicts, 1962 // before returning an error. 1963 // Note: Needs platform-dependent factoring. 1964 bool status = true; 1965 1966 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 1967 // builds so the cost of stack banging can be measured. 1968#if (defined(PRODUCT) && defined(SOLARIS)) 1969 if (!UseBoundThreads && !UseStackBanging) { 1970 jio_fprintf(defaultStream::error_stream(), 1971 "-UseStackBanging conflicts with -UseBoundThreads\n"); 1972 1973 status = false; 1974 } 1975#endif 1976 1977 if (TLABRefillWasteFraction == 0) { 1978 jio_fprintf(defaultStream::error_stream(), 1979 "TLABRefillWasteFraction should be a denominator, " 1980 "not " SIZE_FORMAT "\n", 1981 TLABRefillWasteFraction); 1982 status = false; 1983 } 1984 1985 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 1986 "AdaptiveSizePolicyWeight"); 1987 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 1988 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 1989 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 1990 1991 // Divide by bucket size to prevent a large size from causing rollover when 1992 // calculating amount of memory needed to be allocated for the String table. 1993 status = status && verify_interval(StringTableSize, minimumStringTableSize, 1994 (max_uintx / StringTable::bucket_size()), "StringTable size"); 1995 1996 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 1997 jio_fprintf(defaultStream::error_stream(), 1998 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1999 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 2000 MinHeapFreeRatio, MaxHeapFreeRatio); 2001 status = false; 2002 } 2003 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 2004 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 2005 2006 // Min/MaxMetaspaceFreeRatio 2007 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2008 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2009 2010 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2011 jio_fprintf(defaultStream::error_stream(), 2012 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2013 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2014 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2015 MinMetaspaceFreeRatio, 2016 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2017 MaxMetaspaceFreeRatio); 2018 status = false; 2019 } 2020 2021 // Trying to keep 100% free is not practical 2022 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2023 2024 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2025 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2026 } 2027 2028 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2029 // Settings to encourage splitting. 2030 if (!FLAG_IS_CMDLINE(NewRatio)) { 2031 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2032 } 2033 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2034 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2035 } 2036 } 2037 2038 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2039 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2040 if (GCTimeLimit == 100) { 2041 // Turn off gc-overhead-limit-exceeded checks 2042 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2043 } 2044 2045 status = status && check_gc_consistency(); 2046 status = status && check_stack_pages(); 2047 2048 if (CMSIncrementalMode) { 2049 if (!UseConcMarkSweepGC) { 2050 jio_fprintf(defaultStream::error_stream(), 2051 "error: invalid argument combination.\n" 2052 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 2053 "selected in order\nto use CMSIncrementalMode.\n"); 2054 status = false; 2055 } else { 2056 status = status && verify_percentage(CMSIncrementalDutyCycle, 2057 "CMSIncrementalDutyCycle"); 2058 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 2059 "CMSIncrementalDutyCycleMin"); 2060 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2061 "CMSIncrementalSafetyFactor"); 2062 status = status && verify_percentage(CMSIncrementalOffset, 2063 "CMSIncrementalOffset"); 2064 status = status && verify_percentage(CMSExpAvgFactor, 2065 "CMSExpAvgFactor"); 2066 // If it was not set on the command line, set 2067 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 2068 if (CMSInitiatingOccupancyFraction < 0) { 2069 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 2070 } 2071 } 2072 } 2073 2074 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2075 // insists that we hold the requisite locks so that the iteration is 2076 // MT-safe. For the verification at start-up and shut-down, we don't 2077 // yet have a good way of acquiring and releasing these locks, 2078 // which are not visible at the CollectedHeap level. We want to 2079 // be able to acquire these locks and then do the iteration rather 2080 // than just disable the lock verification. This will be fixed under 2081 // bug 4788986. 2082 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2083 if (VerifyDuringStartup) { 2084 warning("Heap verification at start-up disabled " 2085 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2086 VerifyDuringStartup = false; // Disable verification at start-up 2087 } 2088 2089 if (VerifyBeforeExit) { 2090 warning("Heap verification at shutdown disabled " 2091 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2092 VerifyBeforeExit = false; // Disable verification at shutdown 2093 } 2094 } 2095 2096 // Note: only executed in non-PRODUCT mode 2097 if (!UseAsyncConcMarkSweepGC && 2098 (ExplicitGCInvokesConcurrent || 2099 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2100 jio_fprintf(defaultStream::error_stream(), 2101 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2102 " with -UseAsyncConcMarkSweepGC"); 2103 status = false; 2104 } 2105 2106 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2107 2108#if INCLUDE_ALL_GCS 2109 if (UseG1GC) { 2110 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2111 "InitiatingHeapOccupancyPercent"); 2112 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2113 "G1RefProcDrainInterval"); 2114 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2115 "G1ConcMarkStepDurationMillis"); 2116 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2117 "G1ConcRSHotCardLimit"); 2118 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2119 "G1ConcRSLogCacheSize"); 2120 } 2121 if (UseConcMarkSweepGC) { 2122 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2123 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2124 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2125 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2126 2127 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2128 2129 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2130 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2131 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2132 2133 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2134 2135 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2136 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2137 2138 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2139 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2140 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2141 2142 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2143 2144 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2145 2146 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2147 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2148 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2149 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2150 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2151 } 2152 2153 if (UseParallelGC || UseParallelOldGC) { 2154 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2155 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2156 2157 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2158 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2159 2160 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2161 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2162 2163 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2164 2165 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2166 } 2167#endif // INCLUDE_ALL_GCS 2168 2169 status = status && verify_interval(RefDiscoveryPolicy, 2170 ReferenceProcessor::DiscoveryPolicyMin, 2171 ReferenceProcessor::DiscoveryPolicyMax, 2172 "RefDiscoveryPolicy"); 2173 2174 // Limit the lower bound of this flag to 1 as it is used in a division 2175 // expression. 2176 status = status && verify_interval(TLABWasteTargetPercent, 2177 1, 100, "TLABWasteTargetPercent"); 2178 2179 status = status && verify_object_alignment(); 2180 2181 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2182 "CompressedClassSpaceSize"); 2183 2184 status = status && verify_interval(MarkStackSizeMax, 2185 1, (max_jint - 1), "MarkStackSizeMax"); 2186 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2187 2188 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2189 2190 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2191 2192 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2193 2194 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2195 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2196 2197 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2198 2199 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2200 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2201 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2202 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2203 2204 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2205 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2206 2207 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2208 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2209 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2210 2211 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2212 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2213 2214 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp 2215 // just for that, so hardcode here. 2216 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold"); 2217 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold"); 2218 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2219 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2220 2221 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2222#ifdef SPARC 2223 if (UseConcMarkSweepGC || UseG1GC) { 2224 // Issue a stern warning if the user has explicitly set 2225 // UseMemSetInBOT (it is known to cause issues), but allow 2226 // use for experimentation and debugging. 2227 if (VM_Version::is_sun4v() && UseMemSetInBOT) { 2228 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error"); 2229 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability" 2230 " on sun4v; please understand that you are using at your own risk!"); 2231 } 2232 } 2233#endif // SPARC 2234 2235 if (PrintNMTStatistics) { 2236#if INCLUDE_NMT 2237 if (MemTracker::tracking_level() == MemTracker::NMT_off) { 2238#endif // INCLUDE_NMT 2239 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2240 PrintNMTStatistics = false; 2241#if INCLUDE_NMT 2242 } 2243#endif 2244 } 2245 2246 // Need to limit the extent of the padding to reasonable size. 2247 // 8K is well beyond the reasonable HW cache line size, even with the 2248 // aggressive prefetching, while still leaving the room for segregating 2249 // among the distinct pages. 2250 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2251 jio_fprintf(defaultStream::error_stream(), 2252 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2253 ContendedPaddingWidth, 0, 8192); 2254 status = false; 2255 } 2256 2257 // Need to enforce the padding not to break the existing field alignments. 2258 // It is sufficient to check against the largest type size. 2259 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2260 jio_fprintf(defaultStream::error_stream(), 2261 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2262 ContendedPaddingWidth, BytesPerLong); 2263 status = false; 2264 } 2265 2266 // Check lower bounds of the code cache 2267 // Template Interpreter code is approximately 3X larger in debug builds. 2268 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace; 2269 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2270 jio_fprintf(defaultStream::error_stream(), 2271 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2272 os::vm_page_size()/K); 2273 status = false; 2274 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2275 jio_fprintf(defaultStream::error_stream(), 2276 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2277 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2278 status = false; 2279 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2280 jio_fprintf(defaultStream::error_stream(), 2281 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2282 min_code_cache_size/K); 2283 status = false; 2284 } else if (ReservedCodeCacheSize > 2*G) { 2285 // Code cache size larger than MAXINT is not supported. 2286 jio_fprintf(defaultStream::error_stream(), 2287 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2288 (2*G)/M); 2289 status = false; 2290 } 2291 return status; 2292} 2293 2294bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2295 const char* option_type) { 2296 if (ignore) return false; 2297 2298 const char* spacer = " "; 2299 if (option_type == NULL) { 2300 option_type = ++spacer; // Set both to the empty string. 2301 } 2302 2303 if (os::obsolete_option(option)) { 2304 jio_fprintf(defaultStream::error_stream(), 2305 "Obsolete %s%soption: %s\n", option_type, spacer, 2306 option->optionString); 2307 return false; 2308 } else { 2309 jio_fprintf(defaultStream::error_stream(), 2310 "Unrecognized %s%soption: %s\n", option_type, spacer, 2311 option->optionString); 2312 return true; 2313 } 2314} 2315 2316static const char* user_assertion_options[] = { 2317 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2318}; 2319 2320static const char* system_assertion_options[] = { 2321 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2322}; 2323 2324// Return true if any of the strings in null-terminated array 'names' matches. 2325// If tail_allowed is true, then the tail must begin with a colon; otherwise, 2326// the option must match exactly. 2327static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2328 bool tail_allowed) { 2329 for (/* empty */; *names != NULL; ++names) { 2330 if (match_option(option, *names, tail)) { 2331 if (**tail == '\0' || tail_allowed && **tail == ':') { 2332 return true; 2333 } 2334 } 2335 } 2336 return false; 2337} 2338 2339bool Arguments::parse_uintx(const char* value, 2340 uintx* uintx_arg, 2341 uintx min_size) { 2342 2343 // Check the sign first since atomull() parses only unsigned values. 2344 bool value_is_positive = !(*value == '-'); 2345 2346 if (value_is_positive) { 2347 julong n; 2348 bool good_return = atomull(value, &n); 2349 if (good_return) { 2350 bool above_minimum = n >= min_size; 2351 bool value_is_too_large = n > max_uintx; 2352 2353 if (above_minimum && !value_is_too_large) { 2354 *uintx_arg = n; 2355 return true; 2356 } 2357 } 2358 } 2359 return false; 2360} 2361 2362Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2363 julong* long_arg, 2364 julong min_size) { 2365 if (!atomull(s, long_arg)) return arg_unreadable; 2366 return check_memory_size(*long_arg, min_size); 2367} 2368 2369// Parse JavaVMInitArgs structure 2370 2371jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2372 // For components of the system classpath. 2373 SysClassPath scp(Arguments::get_sysclasspath()); 2374 bool scp_assembly_required = false; 2375 2376 // Save default settings for some mode flags 2377 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2378 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2379 Arguments::_ClipInlining = ClipInlining; 2380 Arguments::_BackgroundCompilation = BackgroundCompilation; 2381 2382 // Setup flags for mixed which is the default 2383 set_mode_flags(_mixed); 2384 2385 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2386 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2387 if (result != JNI_OK) { 2388 return result; 2389 } 2390 2391 // Parse JavaVMInitArgs structure passed in 2392 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE); 2393 if (result != JNI_OK) { 2394 return result; 2395 } 2396 2397 if (AggressiveOpts) { 2398 // Insert alt-rt.jar between user-specified bootclasspath 2399 // prefix and the default bootclasspath. os::set_boot_path() 2400 // uses meta_index_dir as the default bootclasspath directory. 2401 const char* altclasses_jar = "alt-rt.jar"; 2402 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 + 2403 strlen(altclasses_jar); 2404 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal); 2405 strcpy(altclasses_path, get_meta_index_dir()); 2406 strcat(altclasses_path, altclasses_jar); 2407 scp.add_suffix_to_prefix(altclasses_path); 2408 scp_assembly_required = true; 2409 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal); 2410 } 2411 2412 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2413 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2414 if (result != JNI_OK) { 2415 return result; 2416 } 2417 2418 // Do final processing now that all arguments have been parsed 2419 result = finalize_vm_init_args(&scp, scp_assembly_required); 2420 if (result != JNI_OK) { 2421 return result; 2422 } 2423 2424 return JNI_OK; 2425} 2426 2427// Checks if name in command-line argument -agent{lib,path}:name[=options] 2428// represents a valid HPROF of JDWP agent. is_path==true denotes that we 2429// are dealing with -agentpath (case where name is a path), otherwise with 2430// -agentlib 2431bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2432 char *_name; 2433 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2434 size_t _len_hprof, _len_jdwp, _len_prefix; 2435 2436 if (is_path) { 2437 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2438 return false; 2439 } 2440 2441 _name++; // skip past last path separator 2442 _len_prefix = strlen(JNI_LIB_PREFIX); 2443 2444 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2445 return false; 2446 } 2447 2448 _name += _len_prefix; 2449 _len_hprof = strlen(_hprof); 2450 _len_jdwp = strlen(_jdwp); 2451 2452 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2453 _name += _len_hprof; 2454 } 2455 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2456 _name += _len_jdwp; 2457 } 2458 else { 2459 return false; 2460 } 2461 2462 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2463 return false; 2464 } 2465 2466 return true; 2467 } 2468 2469 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2470 return true; 2471 } 2472 2473 return false; 2474} 2475 2476jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2477 SysClassPath* scp_p, 2478 bool* scp_assembly_required_p, 2479 FlagValueOrigin origin) { 2480 // Remaining part of option string 2481 const char* tail; 2482 2483 // iterate over arguments 2484 for (int index = 0; index < args->nOptions; index++) { 2485 bool is_absolute_path = false; // for -agentpath vs -agentlib 2486 2487 const JavaVMOption* option = args->options + index; 2488 2489 if (!match_option(option, "-Djava.class.path", &tail) && 2490 !match_option(option, "-Dsun.java.command", &tail) && 2491 !match_option(option, "-Dsun.java.launcher", &tail)) { 2492 2493 // add all jvm options to the jvm_args string. This string 2494 // is used later to set the java.vm.args PerfData string constant. 2495 // the -Djava.class.path and the -Dsun.java.command options are 2496 // omitted from jvm_args string as each have their own PerfData 2497 // string constant object. 2498 build_jvm_args(option->optionString); 2499 } 2500 2501 // -verbose:[class/gc/jni] 2502 if (match_option(option, "-verbose", &tail)) { 2503 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2504 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2505 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2506 } else if (!strcmp(tail, ":gc")) { 2507 FLAG_SET_CMDLINE(bool, PrintGC, true); 2508 } else if (!strcmp(tail, ":jni")) { 2509 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2510 } 2511 // -da / -ea / -disableassertions / -enableassertions 2512 // These accept an optional class/package name separated by a colon, e.g., 2513 // -da:java.lang.Thread. 2514 } else if (match_option(option, user_assertion_options, &tail, true)) { 2515 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2516 if (*tail == '\0') { 2517 JavaAssertions::setUserClassDefault(enable); 2518 } else { 2519 assert(*tail == ':', "bogus match by match_option()"); 2520 JavaAssertions::addOption(tail + 1, enable); 2521 } 2522 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2523 } else if (match_option(option, system_assertion_options, &tail, false)) { 2524 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2525 JavaAssertions::setSystemClassDefault(enable); 2526 // -bootclasspath: 2527 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2528 scp_p->reset_path(tail); 2529 *scp_assembly_required_p = true; 2530 // -bootclasspath/a: 2531 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2532 scp_p->add_suffix(tail); 2533 *scp_assembly_required_p = true; 2534 // -bootclasspath/p: 2535 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2536 scp_p->add_prefix(tail); 2537 *scp_assembly_required_p = true; 2538 // -Xrun 2539 } else if (match_option(option, "-Xrun", &tail)) { 2540 if (tail != NULL) { 2541 const char* pos = strchr(tail, ':'); 2542 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2543 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2544 name[len] = '\0'; 2545 2546 char *options = NULL; 2547 if(pos != NULL) { 2548 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2549 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2550 } 2551#if !INCLUDE_JVMTI 2552 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2553 jio_fprintf(defaultStream::error_stream(), 2554 "Profiling and debugging agents are not supported in this VM\n"); 2555 return JNI_ERR; 2556 } 2557#endif // !INCLUDE_JVMTI 2558 add_init_library(name, options); 2559 } 2560 // -agentlib and -agentpath 2561 } else if (match_option(option, "-agentlib:", &tail) || 2562 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2563 if(tail != NULL) { 2564 const char* pos = strchr(tail, '='); 2565 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2566 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2567 name[len] = '\0'; 2568 2569 char *options = NULL; 2570 if(pos != NULL) { 2571 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2572 } 2573#if !INCLUDE_JVMTI 2574 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2575 jio_fprintf(defaultStream::error_stream(), 2576 "Profiling and debugging agents are not supported in this VM\n"); 2577 return JNI_ERR; 2578 } 2579#endif // !INCLUDE_JVMTI 2580 add_init_agent(name, options, is_absolute_path); 2581 } 2582 // -javaagent 2583 } else if (match_option(option, "-javaagent:", &tail)) { 2584#if !INCLUDE_JVMTI 2585 jio_fprintf(defaultStream::error_stream(), 2586 "Instrumentation agents are not supported in this VM\n"); 2587 return JNI_ERR; 2588#else 2589 if(tail != NULL) { 2590 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2591 add_init_agent("instrument", options, false); 2592 } 2593#endif // !INCLUDE_JVMTI 2594 // -Xnoclassgc 2595 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2596 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2597 // -Xincgc: i-CMS 2598 } else if (match_option(option, "-Xincgc", &tail)) { 2599 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2600 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2601 // -Xnoincgc: no i-CMS 2602 } else if (match_option(option, "-Xnoincgc", &tail)) { 2603 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2604 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2605 // -Xconcgc 2606 } else if (match_option(option, "-Xconcgc", &tail)) { 2607 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2608 // -Xnoconcgc 2609 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2610 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2611 // -Xbatch 2612 } else if (match_option(option, "-Xbatch", &tail)) { 2613 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2614 // -Xmn for compatibility with other JVM vendors 2615 } else if (match_option(option, "-Xmn", &tail)) { 2616 julong long_initial_eden_size = 0; 2617 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1); 2618 if (errcode != arg_in_range) { 2619 jio_fprintf(defaultStream::error_stream(), 2620 "Invalid initial eden size: %s\n", option->optionString); 2621 describe_range_error(errcode); 2622 return JNI_EINVAL; 2623 } 2624 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size); 2625 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size); 2626 // -Xms 2627 } else if (match_option(option, "-Xms", &tail)) { 2628 julong long_initial_heap_size = 0; 2629 // an initial heap size of 0 means automatically determine 2630 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2631 if (errcode != arg_in_range) { 2632 jio_fprintf(defaultStream::error_stream(), 2633 "Invalid initial heap size: %s\n", option->optionString); 2634 describe_range_error(errcode); 2635 return JNI_EINVAL; 2636 } 2637 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2638 // Currently the minimum size and the initial heap sizes are the same. 2639 set_min_heap_size(InitialHeapSize); 2640 // -Xmx 2641 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2642 julong long_max_heap_size = 0; 2643 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2644 if (errcode != arg_in_range) { 2645 jio_fprintf(defaultStream::error_stream(), 2646 "Invalid maximum heap size: %s\n", option->optionString); 2647 describe_range_error(errcode); 2648 return JNI_EINVAL; 2649 } 2650 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2651 // Xmaxf 2652 } else if (match_option(option, "-Xmaxf", &tail)) { 2653 int maxf = (int)(atof(tail) * 100); 2654 if (maxf < 0 || maxf > 100) { 2655 jio_fprintf(defaultStream::error_stream(), 2656 "Bad max heap free percentage size: %s\n", 2657 option->optionString); 2658 return JNI_EINVAL; 2659 } else { 2660 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2661 } 2662 // Xminf 2663 } else if (match_option(option, "-Xminf", &tail)) { 2664 int minf = (int)(atof(tail) * 100); 2665 if (minf < 0 || minf > 100) { 2666 jio_fprintf(defaultStream::error_stream(), 2667 "Bad min heap free percentage size: %s\n", 2668 option->optionString); 2669 return JNI_EINVAL; 2670 } else { 2671 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2672 } 2673 // -Xss 2674 } else if (match_option(option, "-Xss", &tail)) { 2675 julong long_ThreadStackSize = 0; 2676 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2677 if (errcode != arg_in_range) { 2678 jio_fprintf(defaultStream::error_stream(), 2679 "Invalid thread stack size: %s\n", option->optionString); 2680 describe_range_error(errcode); 2681 return JNI_EINVAL; 2682 } 2683 // Internally track ThreadStackSize in units of 1024 bytes. 2684 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2685 round_to((int)long_ThreadStackSize, K) / K); 2686 // -Xoss 2687 } else if (match_option(option, "-Xoss", &tail)) { 2688 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2689 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2690 julong long_CodeCacheExpansionSize = 0; 2691 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2692 if (errcode != arg_in_range) { 2693 jio_fprintf(defaultStream::error_stream(), 2694 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2695 os::vm_page_size()/K); 2696 return JNI_EINVAL; 2697 } 2698 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2699 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2700 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2701 julong long_ReservedCodeCacheSize = 0; 2702 2703 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2704 if (errcode != arg_in_range) { 2705 jio_fprintf(defaultStream::error_stream(), 2706 "Invalid maximum code cache size: %s.\n", option->optionString); 2707 return JNI_EINVAL; 2708 } 2709 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2710 //-XX:IncreaseFirstTierCompileThresholdAt= 2711 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2712 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2713 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2714 jio_fprintf(defaultStream::error_stream(), 2715 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2716 option->optionString); 2717 return JNI_EINVAL; 2718 } 2719 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2720 // -green 2721 } else if (match_option(option, "-green", &tail)) { 2722 jio_fprintf(defaultStream::error_stream(), 2723 "Green threads support not available\n"); 2724 return JNI_EINVAL; 2725 // -native 2726 } else if (match_option(option, "-native", &tail)) { 2727 // HotSpot always uses native threads, ignore silently for compatibility 2728 // -Xsqnopause 2729 } else if (match_option(option, "-Xsqnopause", &tail)) { 2730 // EVM option, ignore silently for compatibility 2731 // -Xrs 2732 } else if (match_option(option, "-Xrs", &tail)) { 2733 // Classic/EVM option, new functionality 2734 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2735 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2736 // change default internal VM signals used - lower case for back compat 2737 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2738 // -Xoptimize 2739 } else if (match_option(option, "-Xoptimize", &tail)) { 2740 // EVM option, ignore silently for compatibility 2741 // -Xprof 2742 } else if (match_option(option, "-Xprof", &tail)) { 2743#if INCLUDE_FPROF 2744 _has_profile = true; 2745#else // INCLUDE_FPROF 2746 jio_fprintf(defaultStream::error_stream(), 2747 "Flat profiling is not supported in this VM.\n"); 2748 return JNI_ERR; 2749#endif // INCLUDE_FPROF 2750 // -Xconcurrentio 2751 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2752 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2753 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2754 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2755 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2756 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2757 2758 // -Xinternalversion 2759 } else if (match_option(option, "-Xinternalversion", &tail)) { 2760 jio_fprintf(defaultStream::output_stream(), "%s\n", 2761 VM_Version::internal_vm_info_string()); 2762 vm_exit(0); 2763#ifndef PRODUCT 2764 // -Xprintflags 2765 } else if (match_option(option, "-Xprintflags", &tail)) { 2766 CommandLineFlags::printFlags(tty, false); 2767 vm_exit(0); 2768#endif 2769 // -D 2770 } else if (match_option(option, "-D", &tail)) { 2771 if (!add_property(tail)) { 2772 return JNI_ENOMEM; 2773 } 2774 // Out of the box management support 2775 if (match_option(option, "-Dcom.sun.management", &tail)) { 2776#if INCLUDE_MANAGEMENT 2777 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2778#else 2779 jio_fprintf(defaultStream::output_stream(), 2780 "-Dcom.sun.management is not supported in this VM.\n"); 2781 return JNI_ERR; 2782#endif 2783 } 2784 // -Xint 2785 } else if (match_option(option, "-Xint", &tail)) { 2786 set_mode_flags(_int); 2787 // -Xmixed 2788 } else if (match_option(option, "-Xmixed", &tail)) { 2789 set_mode_flags(_mixed); 2790 // -Xcomp 2791 } else if (match_option(option, "-Xcomp", &tail)) { 2792 // for testing the compiler; turn off all flags that inhibit compilation 2793 set_mode_flags(_comp); 2794 // -Xshare:dump 2795 } else if (match_option(option, "-Xshare:dump", &tail)) { 2796 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2797 set_mode_flags(_int); // Prevent compilation, which creates objects 2798 // -Xshare:on 2799 } else if (match_option(option, "-Xshare:on", &tail)) { 2800 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2801 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2802 // -Xshare:auto 2803 } else if (match_option(option, "-Xshare:auto", &tail)) { 2804 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2805 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2806 // -Xshare:off 2807 } else if (match_option(option, "-Xshare:off", &tail)) { 2808 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2809 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2810 // -Xverify 2811 } else if (match_option(option, "-Xverify", &tail)) { 2812 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2813 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2814 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2815 } else if (strcmp(tail, ":remote") == 0) { 2816 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2817 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2818 } else if (strcmp(tail, ":none") == 0) { 2819 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2820 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2821 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2822 return JNI_EINVAL; 2823 } 2824 // -Xdebug 2825 } else if (match_option(option, "-Xdebug", &tail)) { 2826 // note this flag has been used, then ignore 2827 set_xdebug_mode(true); 2828 // -Xnoagent 2829 } else if (match_option(option, "-Xnoagent", &tail)) { 2830 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2831 } else if (match_option(option, "-Xboundthreads", &tail)) { 2832 // Bind user level threads to kernel threads (Solaris only) 2833 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2834 } else if (match_option(option, "-Xloggc:", &tail)) { 2835 // Redirect GC output to the file. -Xloggc:<filename> 2836 // ostream_init_log(), when called will use this filename 2837 // to initialize a fileStream. 2838 _gc_log_filename = strdup(tail); 2839 FLAG_SET_CMDLINE(bool, PrintGC, true); 2840 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2841 2842 // JNI hooks 2843 } else if (match_option(option, "-Xcheck", &tail)) { 2844 if (!strcmp(tail, ":jni")) { 2845#if !INCLUDE_JNI_CHECK 2846 warning("JNI CHECKING is not supported in this VM"); 2847#else 2848 CheckJNICalls = true; 2849#endif // INCLUDE_JNI_CHECK 2850 } else if (is_bad_option(option, args->ignoreUnrecognized, 2851 "check")) { 2852 return JNI_EINVAL; 2853 } 2854 } else if (match_option(option, "vfprintf", &tail)) { 2855 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2856 } else if (match_option(option, "exit", &tail)) { 2857 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2858 } else if (match_option(option, "abort", &tail)) { 2859 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2860 // -XX:+AggressiveHeap 2861 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2862 2863 // This option inspects the machine and attempts to set various 2864 // parameters to be optimal for long-running, memory allocation 2865 // intensive jobs. It is intended for machines with large 2866 // amounts of cpu and memory. 2867 2868 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2869 // VM, but we may not be able to represent the total physical memory 2870 // available (like having 8gb of memory on a box but using a 32bit VM). 2871 // Thus, we need to make sure we're using a julong for intermediate 2872 // calculations. 2873 julong initHeapSize; 2874 julong total_memory = os::physical_memory(); 2875 2876 if (total_memory < (julong)256*M) { 2877 jio_fprintf(defaultStream::error_stream(), 2878 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2879 vm_exit(1); 2880 } 2881 2882 // The heap size is half of available memory, or (at most) 2883 // all of possible memory less 160mb (leaving room for the OS 2884 // when using ISM). This is the maximum; because adaptive sizing 2885 // is turned on below, the actual space used may be smaller. 2886 2887 initHeapSize = MIN2(total_memory / (julong)2, 2888 total_memory - (julong)160*M); 2889 2890 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2891 2892 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2893 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2894 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2895 // Currently the minimum size and the initial heap sizes are the same. 2896 set_min_heap_size(initHeapSize); 2897 } 2898 if (FLAG_IS_DEFAULT(NewSize)) { 2899 // Make the young generation 3/8ths of the total heap. 2900 FLAG_SET_CMDLINE(uintx, NewSize, 2901 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2902 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2903 } 2904 2905#ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 2906 FLAG_SET_DEFAULT(UseLargePages, true); 2907#endif 2908 2909 // Increase some data structure sizes for efficiency 2910 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2911 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2912 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2913 2914 // See the OldPLABSize comment below, but replace 'after promotion' 2915 // with 'after copying'. YoungPLABSize is the size of the survivor 2916 // space per-gc-thread buffers. The default is 4kw. 2917 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2918 2919 // OldPLABSize is the size of the buffers in the old gen that 2920 // UseParallelGC uses to promote live data that doesn't fit in the 2921 // survivor spaces. At any given time, there's one for each gc thread. 2922 // The default size is 1kw. These buffers are rarely used, since the 2923 // survivor spaces are usually big enough. For specjbb, however, there 2924 // are occasions when there's lots of live data in the young gen 2925 // and we end up promoting some of it. We don't have a definite 2926 // explanation for why bumping OldPLABSize helps, but the theory 2927 // is that a bigger PLAB results in retaining something like the 2928 // original allocation order after promotion, which improves mutator 2929 // locality. A minor effect may be that larger PLABs reduce the 2930 // number of PLAB allocation events during gc. The value of 8kw 2931 // was arrived at by experimenting with specjbb. 2932 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2933 2934 // Enable parallel GC and adaptive generation sizing 2935 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2936 FLAG_SET_DEFAULT(ParallelGCThreads, 2937 Abstract_VM_Version::parallel_worker_threads()); 2938 2939 // Encourage steady state memory management 2940 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2941 2942 // This appears to improve mutator locality 2943 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2944 2945 // Get around early Solaris scheduling bug 2946 // (affinity vs other jobs on system) 2947 // but disallow DR and offlining (5008695). 2948 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 2949 2950 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 2951 // The last option must always win. 2952 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 2953 FLAG_SET_CMDLINE(bool, NeverTenure, true); 2954 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 2955 // The last option must always win. 2956 FLAG_SET_CMDLINE(bool, NeverTenure, false); 2957 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 2958 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 2959 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 2960 jio_fprintf(defaultStream::error_stream(), 2961 "Please use CMSClassUnloadingEnabled in place of " 2962 "CMSPermGenSweepingEnabled in the future\n"); 2963 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 2964 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 2965 jio_fprintf(defaultStream::error_stream(), 2966 "Please use -XX:+UseGCOverheadLimit in place of " 2967 "-XX:+UseGCTimeLimit in the future\n"); 2968 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 2969 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 2970 jio_fprintf(defaultStream::error_stream(), 2971 "Please use -XX:-UseGCOverheadLimit in place of " 2972 "-XX:-UseGCTimeLimit in the future\n"); 2973 // The TLE options are for compatibility with 1.3 and will be 2974 // removed without notice in a future release. These options 2975 // are not to be documented. 2976 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 2977 // No longer used. 2978 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 2979 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 2980 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 2981 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2982 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 2983 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 2984 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 2985 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 2986 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 2987 // No longer used. 2988 } else if (match_option(option, "-XX:TLESize=", &tail)) { 2989 julong long_tlab_size = 0; 2990 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 2991 if (errcode != arg_in_range) { 2992 jio_fprintf(defaultStream::error_stream(), 2993 "Invalid TLAB size: %s\n", option->optionString); 2994 describe_range_error(errcode); 2995 return JNI_EINVAL; 2996 } 2997 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 2998 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 2999 // No longer used. 3000 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 3001 FLAG_SET_CMDLINE(bool, UseTLAB, true); 3002 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 3003 FLAG_SET_CMDLINE(bool, UseTLAB, false); 3004 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 3005 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3006 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3007 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 3008 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3009 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3010 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 3011#if defined(DTRACE_ENABLED) 3012 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3013 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3014 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3015 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3016#else // defined(DTRACE_ENABLED) 3017 jio_fprintf(defaultStream::error_stream(), 3018 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3019 return JNI_EINVAL; 3020#endif // defined(DTRACE_ENABLED) 3021#ifdef ASSERT 3022 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 3023 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3024 // disable scavenge before parallel mark-compact 3025 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3026#endif 3027 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 3028 julong cms_blocks_to_claim = (julong)atol(tail); 3029 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3030 jio_fprintf(defaultStream::error_stream(), 3031 "Please use -XX:OldPLABSize in place of " 3032 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 3033 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 3034 julong cms_blocks_to_claim = (julong)atol(tail); 3035 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3036 jio_fprintf(defaultStream::error_stream(), 3037 "Please use -XX:OldPLABSize in place of " 3038 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 3039 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 3040 julong old_plab_size = 0; 3041 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 3042 if (errcode != arg_in_range) { 3043 jio_fprintf(defaultStream::error_stream(), 3044 "Invalid old PLAB size: %s\n", option->optionString); 3045 describe_range_error(errcode); 3046 return JNI_EINVAL; 3047 } 3048 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 3049 jio_fprintf(defaultStream::error_stream(), 3050 "Please use -XX:OldPLABSize in place of " 3051 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 3052 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 3053 julong young_plab_size = 0; 3054 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 3055 if (errcode != arg_in_range) { 3056 jio_fprintf(defaultStream::error_stream(), 3057 "Invalid young PLAB size: %s\n", option->optionString); 3058 describe_range_error(errcode); 3059 return JNI_EINVAL; 3060 } 3061 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 3062 jio_fprintf(defaultStream::error_stream(), 3063 "Please use -XX:YoungPLABSize in place of " 3064 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 3065 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3066 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3067 julong stack_size = 0; 3068 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3069 if (errcode != arg_in_range) { 3070 jio_fprintf(defaultStream::error_stream(), 3071 "Invalid mark stack size: %s\n", option->optionString); 3072 describe_range_error(errcode); 3073 return JNI_EINVAL; 3074 } 3075 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3076 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3077 julong max_stack_size = 0; 3078 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3079 if (errcode != arg_in_range) { 3080 jio_fprintf(defaultStream::error_stream(), 3081 "Invalid maximum mark stack size: %s\n", 3082 option->optionString); 3083 describe_range_error(errcode); 3084 return JNI_EINVAL; 3085 } 3086 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3087 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3088 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3089 uintx conc_threads = 0; 3090 if (!parse_uintx(tail, &conc_threads, 1)) { 3091 jio_fprintf(defaultStream::error_stream(), 3092 "Invalid concurrent threads: %s\n", option->optionString); 3093 return JNI_EINVAL; 3094 } 3095 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3096 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3097 julong max_direct_memory_size = 0; 3098 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3099 if (errcode != arg_in_range) { 3100 jio_fprintf(defaultStream::error_stream(), 3101 "Invalid maximum direct memory size: %s\n", 3102 option->optionString); 3103 describe_range_error(errcode); 3104 return JNI_EINVAL; 3105 } 3106 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3107 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) { 3108 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go 3109 // away and will cause VM initialization failures! 3110 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release."); 3111 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true); 3112#if !INCLUDE_MANAGEMENT 3113 } else if (match_option(option, "-XX:+ManagementServer", &tail)) { 3114 jio_fprintf(defaultStream::error_stream(), 3115 "ManagementServer is not supported in this VM.\n"); 3116 return JNI_ERR; 3117#endif // INCLUDE_MANAGEMENT 3118 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3119 // Skip -XX:Flags= since that case has already been handled 3120 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3121 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3122 return JNI_EINVAL; 3123 } 3124 } 3125 // Unknown option 3126 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3127 return JNI_ERR; 3128 } 3129 } 3130 3131 // Change the default value for flags which have different default values 3132 // when working with older JDKs. 3133#ifdef LINUX 3134 if (JDK_Version::current().compare_major(6) <= 0 && 3135 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3136 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3137 } 3138#endif // LINUX 3139 return JNI_OK; 3140} 3141 3142jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3143 // This must be done after all -D arguments have been processed. 3144 scp_p->expand_endorsed(); 3145 3146 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 3147 // Assemble the bootclasspath elements into the final path. 3148 Arguments::set_sysclasspath(scp_p->combined_path()); 3149 } 3150 3151 // This must be done after all arguments have been processed. 3152 // java_compiler() true means set to "NONE" or empty. 3153 if (java_compiler() && !xdebug_mode()) { 3154 // For backwards compatibility, we switch to interpreted mode if 3155 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3156 // not specified. 3157 set_mode_flags(_int); 3158 } 3159 if (CompileThreshold == 0) { 3160 set_mode_flags(_int); 3161 } 3162 3163 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3164 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3165 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3166 } 3167 3168#ifndef COMPILER2 3169 // Don't degrade server performance for footprint 3170 if (FLAG_IS_DEFAULT(UseLargePages) && 3171 MaxHeapSize < LargePageHeapSizeThreshold) { 3172 // No need for large granularity pages w/small heaps. 3173 // Note that large pages are enabled/disabled for both the 3174 // Java heap and the code cache. 3175 FLAG_SET_DEFAULT(UseLargePages, false); 3176 } 3177 3178#else 3179 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3180 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3181 } 3182#endif 3183 3184#ifndef TIERED 3185 // Tiered compilation is undefined. 3186 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3187#endif 3188 3189 // If we are running in a headless jre, force java.awt.headless property 3190 // to be true unless the property has already been set. 3191 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3192 if (os::is_headless_jre()) { 3193 const char* headless = Arguments::get_property("java.awt.headless"); 3194 if (headless == NULL) { 3195 char envbuffer[128]; 3196 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3197 if (!add_property("java.awt.headless=true")) { 3198 return JNI_ENOMEM; 3199 } 3200 } else { 3201 char buffer[256]; 3202 strcpy(buffer, "java.awt.headless="); 3203 strcat(buffer, envbuffer); 3204 if (!add_property(buffer)) { 3205 return JNI_ENOMEM; 3206 } 3207 } 3208 } 3209 } 3210 3211 if (!check_vm_args_consistency()) { 3212 return JNI_ERR; 3213 } 3214 3215 return JNI_OK; 3216} 3217 3218jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3219 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3220 scp_assembly_required_p); 3221} 3222 3223jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3224 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3225 scp_assembly_required_p); 3226} 3227 3228jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3229 const int N_MAX_OPTIONS = 64; 3230 const int OPTION_BUFFER_SIZE = 1024; 3231 char buffer[OPTION_BUFFER_SIZE]; 3232 3233 // The variable will be ignored if it exceeds the length of the buffer. 3234 // Don't check this variable if user has special privileges 3235 // (e.g. unix su command). 3236 if (os::getenv(name, buffer, sizeof(buffer)) && 3237 !os::have_special_privileges()) { 3238 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3239 jio_fprintf(defaultStream::error_stream(), 3240 "Picked up %s: %s\n", name, buffer); 3241 char* rd = buffer; // pointer to the input string (rd) 3242 int i; 3243 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3244 while (isspace(*rd)) rd++; // skip whitespace 3245 if (*rd == 0) break; // we re done when the input string is read completely 3246 3247 // The output, option string, overwrites the input string. 3248 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3249 // input string (rd). 3250 char* wrt = rd; 3251 3252 options[i++].optionString = wrt; // Fill in option 3253 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3254 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3255 int quote = *rd; // matching quote to look for 3256 rd++; // don't copy open quote 3257 while (*rd != quote) { // include everything (even spaces) up until quote 3258 if (*rd == 0) { // string termination means unmatched string 3259 jio_fprintf(defaultStream::error_stream(), 3260 "Unmatched quote in %s\n", name); 3261 return JNI_ERR; 3262 } 3263 *wrt++ = *rd++; // copy to option string 3264 } 3265 rd++; // don't copy close quote 3266 } else { 3267 *wrt++ = *rd++; // copy to option string 3268 } 3269 } 3270 // Need to check if we're done before writing a NULL, 3271 // because the write could be to the byte that rd is pointing to. 3272 if (*rd++ == 0) { 3273 *wrt = 0; 3274 break; 3275 } 3276 *wrt = 0; // Zero terminate option 3277 } 3278 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3279 JavaVMInitArgs vm_args; 3280 vm_args.version = JNI_VERSION_1_2; 3281 vm_args.options = options; 3282 vm_args.nOptions = i; 3283 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3284 3285 if (PrintVMOptions) { 3286 const char* tail; 3287 for (int i = 0; i < vm_args.nOptions; i++) { 3288 const JavaVMOption *option = vm_args.options + i; 3289 if (match_option(option, "-XX:", &tail)) { 3290 logOption(tail); 3291 } 3292 } 3293 } 3294 3295 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR)); 3296 } 3297 return JNI_OK; 3298} 3299 3300void Arguments::set_shared_spaces_flags() { 3301 if (DumpSharedSpaces) { 3302 if (RequireSharedSpaces) { 3303 warning("cannot dump shared archive while using shared archive"); 3304 } 3305 UseSharedSpaces = false; 3306#ifdef _LP64 3307 if (!UseCompressedOops || !UseCompressedClassPointers) { 3308 vm_exit_during_initialization( 3309 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3310 } 3311 } else { 3312 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces. 3313 if (!UseCompressedOops || !UseCompressedClassPointers) { 3314 no_shared_spaces(); 3315 } 3316#endif 3317 } 3318} 3319 3320#if !INCLUDE_ALL_GCS 3321static void force_serial_gc() { 3322 FLAG_SET_DEFAULT(UseSerialGC, true); 3323 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 3324 UNSUPPORTED_GC_OPTION(UseG1GC); 3325 UNSUPPORTED_GC_OPTION(UseParallelGC); 3326 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3327 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3328 UNSUPPORTED_GC_OPTION(UseParNewGC); 3329} 3330#endif // INCLUDE_ALL_GCS 3331 3332// Sharing support 3333// Construct the path to the archive 3334static char* get_shared_archive_path() { 3335 char *shared_archive_path; 3336 if (SharedArchiveFile == NULL) { 3337 char jvm_path[JVM_MAXPATHLEN]; 3338 os::jvm_path(jvm_path, sizeof(jvm_path)); 3339 char *end = strrchr(jvm_path, *os::file_separator()); 3340 if (end != NULL) *end = '\0'; 3341 size_t jvm_path_len = strlen(jvm_path); 3342 size_t file_sep_len = strlen(os::file_separator()); 3343 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3344 file_sep_len + 20, mtInternal); 3345 if (shared_archive_path != NULL) { 3346 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3347 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3348 strncat(shared_archive_path, "classes.jsa", 11); 3349 } 3350 } else { 3351 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3352 if (shared_archive_path != NULL) { 3353 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3354 } 3355 } 3356 return shared_archive_path; 3357} 3358 3359// Parse entry point called from JNI_CreateJavaVM 3360 3361jint Arguments::parse(const JavaVMInitArgs* args) { 3362 3363 // Remaining part of option string 3364 const char* tail; 3365 3366 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3367 const char* hotspotrc = ".hotspotrc"; 3368 bool settings_file_specified = false; 3369 bool needs_hotspotrc_warning = false; 3370 3371 const char* flags_file; 3372 int index; 3373 for (index = 0; index < args->nOptions; index++) { 3374 const JavaVMOption *option = args->options + index; 3375 if (match_option(option, "-XX:Flags=", &tail)) { 3376 flags_file = tail; 3377 settings_file_specified = true; 3378 } 3379 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3380 PrintVMOptions = true; 3381 } 3382 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3383 PrintVMOptions = false; 3384 } 3385 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3386 IgnoreUnrecognizedVMOptions = true; 3387 } 3388 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3389 IgnoreUnrecognizedVMOptions = false; 3390 } 3391 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3392 CommandLineFlags::printFlags(tty, false); 3393 vm_exit(0); 3394 } 3395 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3396#if INCLUDE_NMT 3397 MemTracker::init_tracking_options(tail); 3398#else 3399 jio_fprintf(defaultStream::error_stream(), 3400 "Native Memory Tracking is not supported in this VM\n"); 3401 return JNI_ERR; 3402#endif 3403 } 3404 3405 3406#ifndef PRODUCT 3407 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3408 CommandLineFlags::printFlags(tty, true); 3409 vm_exit(0); 3410 } 3411#endif 3412 } 3413 3414 if (IgnoreUnrecognizedVMOptions) { 3415 // uncast const to modify the flag args->ignoreUnrecognized 3416 *(jboolean*)(&args->ignoreUnrecognized) = true; 3417 } 3418 3419 // Parse specified settings file 3420 if (settings_file_specified) { 3421 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3422 return JNI_EINVAL; 3423 } 3424 } else { 3425#ifdef ASSERT 3426 // Parse default .hotspotrc settings file 3427 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3428 return JNI_EINVAL; 3429 } 3430#else 3431 struct stat buf; 3432 if (os::stat(hotspotrc, &buf) == 0) { 3433 needs_hotspotrc_warning = true; 3434 } 3435#endif 3436 } 3437 3438 if (PrintVMOptions) { 3439 for (index = 0; index < args->nOptions; index++) { 3440 const JavaVMOption *option = args->options + index; 3441 if (match_option(option, "-XX:", &tail)) { 3442 logOption(tail); 3443 } 3444 } 3445 } 3446 3447 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3448 jint result = parse_vm_init_args(args); 3449 if (result != JNI_OK) { 3450 return result; 3451 } 3452 3453 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3454 SharedArchivePath = get_shared_archive_path(); 3455 if (SharedArchivePath == NULL) { 3456 return JNI_ENOMEM; 3457 } 3458 3459 // Delay warning until here so that we've had a chance to process 3460 // the -XX:-PrintWarnings flag 3461 if (needs_hotspotrc_warning) { 3462 warning("%s file is present but has been ignored. " 3463 "Run with -XX:Flags=%s to load the file.", 3464 hotspotrc, hotspotrc); 3465 } 3466 3467#ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3468 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3469#endif 3470 3471#if INCLUDE_ALL_GCS 3472 #if (defined JAVASE_EMBEDDED || defined ARM) 3473 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3474 #endif 3475#endif 3476 3477#ifndef PRODUCT 3478 if (TraceBytecodesAt != 0) { 3479 TraceBytecodes = true; 3480 } 3481 if (CountCompiledCalls) { 3482 if (UseCounterDecay) { 3483 warning("UseCounterDecay disabled because CountCalls is set"); 3484 UseCounterDecay = false; 3485 } 3486 } 3487#endif // PRODUCT 3488 3489 // JSR 292 is not supported before 1.7 3490 if (!JDK_Version::is_gte_jdk17x_version()) { 3491 if (EnableInvokeDynamic) { 3492 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3493 warning("JSR 292 is not supported before 1.7. Disabling support."); 3494 } 3495 EnableInvokeDynamic = false; 3496 } 3497 } 3498 3499 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 3500 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3501 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 3502 } 3503 ScavengeRootsInCode = 1; 3504 } 3505 3506 if (PrintGCDetails) { 3507 // Turn on -verbose:gc options as well 3508 PrintGC = true; 3509 } 3510 3511 if (!JDK_Version::is_gte_jdk18x_version()) { 3512 // To avoid changing the log format for 7 updates this flag is only 3513 // true by default in JDK8 and above. 3514 if (FLAG_IS_DEFAULT(PrintGCCause)) { 3515 FLAG_SET_DEFAULT(PrintGCCause, false); 3516 } 3517 } 3518 3519 // Set object alignment values. 3520 set_object_alignment(); 3521 3522#if !INCLUDE_ALL_GCS 3523 force_serial_gc(); 3524#endif // INCLUDE_ALL_GCS 3525#if !INCLUDE_CDS 3526 if (DumpSharedSpaces || RequireSharedSpaces) { 3527 jio_fprintf(defaultStream::error_stream(), 3528 "Shared spaces are not supported in this VM\n"); 3529 return JNI_ERR; 3530 } 3531 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3532 warning("Shared spaces are not supported in this VM"); 3533 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3534 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3535 } 3536 no_shared_spaces(); 3537#endif // INCLUDE_CDS 3538 3539 return JNI_OK; 3540} 3541 3542jint Arguments::apply_ergo() { 3543 3544 // Set flags based on ergonomics. 3545 set_ergonomics_flags(); 3546 3547 set_shared_spaces_flags(); 3548 3549 // Check the GC selections again. 3550 if (!check_gc_consistency()) { 3551 return JNI_EINVAL; 3552 } 3553 3554 if (TieredCompilation) { 3555 set_tiered_flags(); 3556 } else { 3557 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3558 if (CompilationPolicyChoice >= 2) { 3559 vm_exit_during_initialization( 3560 "Incompatible compilation policy selected", NULL); 3561 } 3562 } 3563 3564 // Set heap size based on available physical memory 3565 set_heap_size(); 3566 3567#if INCLUDE_ALL_GCS 3568 // Set per-collector flags 3569 if (UseParallelGC || UseParallelOldGC) { 3570 set_parallel_gc_flags(); 3571 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below 3572 set_cms_and_parnew_gc_flags(); 3573 } else if (UseParNewGC) { // skipped if CMS is set above 3574 set_parnew_gc_flags(); 3575 } else if (UseG1GC) { 3576 set_g1_gc_flags(); 3577 } 3578 check_deprecated_gcs(); 3579 check_deprecated_gc_flags(); 3580 if (AssumeMP && !UseSerialGC) { 3581 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 3582 warning("If the number of processors is expected to increase from one, then" 3583 " you should configure the number of parallel GC threads appropriately" 3584 " using -XX:ParallelGCThreads=N"); 3585 } 3586 } 3587#else // INCLUDE_ALL_GCS 3588 assert(verify_serial_gc_flags(), "SerialGC unset"); 3589#endif // INCLUDE_ALL_GCS 3590 3591 // Set bytecode rewriting flags 3592 set_bytecode_flags(); 3593 3594 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 3595 set_aggressive_opts_flags(); 3596 3597 // Turn off biased locking for locking debug mode flags, 3598 // which are subtlely different from each other but neither works with 3599 // biased locking. 3600 if (UseHeavyMonitors 3601#ifdef COMPILER1 3602 || !UseFastLocking 3603#endif // COMPILER1 3604 ) { 3605 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3606 // flag set to true on command line; warn the user that they 3607 // can't enable biased locking here 3608 warning("Biased Locking is not supported with locking debug flags" 3609 "; ignoring UseBiasedLocking flag." ); 3610 } 3611 UseBiasedLocking = false; 3612 } 3613 3614#ifdef CC_INTERP 3615 // Clear flags not supported by the C++ interpreter 3616 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3617 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3618 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3619 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3620#endif // CC_INTERP 3621 3622#ifdef COMPILER2 3623 if (!UseBiasedLocking || EmitSync != 0) { 3624 UseOptoBiasInlining = false; 3625 } 3626 if (!EliminateLocks) { 3627 EliminateNestedLocks = false; 3628 } 3629 if (!Inline) { 3630 IncrementalInline = false; 3631 } 3632#ifndef PRODUCT 3633 if (!IncrementalInline) { 3634 AlwaysIncrementalInline = false; 3635 } 3636#endif 3637 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) { 3638 // incremental inlining: bump MaxNodeLimit 3639 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000); 3640 } 3641#endif 3642 3643 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3644 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3645 DebugNonSafepoints = true; 3646 } 3647 3648 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3649 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3650 } 3651 3652#ifndef PRODUCT 3653 if (CompileTheWorld) { 3654 // Force NmethodSweeper to sweep whole CodeCache each time. 3655 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3656 NmethodSweepFraction = 1; 3657 } 3658 } 3659#endif 3660 3661 if (PrintCommandLineFlags) { 3662 CommandLineFlags::printSetFlags(tty); 3663 } 3664 3665 // Apply CPU specific policy for the BiasedLocking 3666 if (UseBiasedLocking) { 3667 if (!VM_Version::use_biased_locking() && 3668 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3669 UseBiasedLocking = false; 3670 } 3671 } 3672 3673 // set PauseAtExit if the gamma launcher was used and a debugger is attached 3674 // but only if not already set on the commandline 3675 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) { 3676 bool set = false; 3677 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set); 3678 if (!set) { 3679 FLAG_SET_DEFAULT(PauseAtExit, true); 3680 } 3681 } 3682 3683 return JNI_OK; 3684} 3685 3686jint Arguments::adjust_after_os() { 3687#if INCLUDE_ALL_GCS 3688 if (UseParallelGC || UseParallelOldGC) { 3689 if (UseNUMA) { 3690 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3691 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3692 } 3693 // For those collectors or operating systems (eg, Windows) that do 3694 // not support full UseNUMA, we will map to UseNUMAInterleaving for now 3695 UseNUMAInterleaving = true; 3696 } 3697 } 3698#endif // INCLUDE_ALL_GCS 3699 return JNI_OK; 3700} 3701 3702int Arguments::PropertyList_count(SystemProperty* pl) { 3703 int count = 0; 3704 while(pl != NULL) { 3705 count++; 3706 pl = pl->next(); 3707 } 3708 return count; 3709} 3710 3711const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3712 assert(key != NULL, "just checking"); 3713 SystemProperty* prop; 3714 for (prop = pl; prop != NULL; prop = prop->next()) { 3715 if (strcmp(key, prop->key()) == 0) return prop->value(); 3716 } 3717 return NULL; 3718} 3719 3720const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3721 int count = 0; 3722 const char* ret_val = NULL; 3723 3724 while(pl != NULL) { 3725 if(count >= index) { 3726 ret_val = pl->key(); 3727 break; 3728 } 3729 count++; 3730 pl = pl->next(); 3731 } 3732 3733 return ret_val; 3734} 3735 3736char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3737 int count = 0; 3738 char* ret_val = NULL; 3739 3740 while(pl != NULL) { 3741 if(count >= index) { 3742 ret_val = pl->value(); 3743 break; 3744 } 3745 count++; 3746 pl = pl->next(); 3747 } 3748 3749 return ret_val; 3750} 3751 3752void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3753 SystemProperty* p = *plist; 3754 if (p == NULL) { 3755 *plist = new_p; 3756 } else { 3757 while (p->next() != NULL) { 3758 p = p->next(); 3759 } 3760 p->set_next(new_p); 3761 } 3762} 3763 3764void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3765 if (plist == NULL) 3766 return; 3767 3768 SystemProperty* new_p = new SystemProperty(k, v, true); 3769 PropertyList_add(plist, new_p); 3770} 3771 3772// This add maintains unique property key in the list. 3773void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3774 if (plist == NULL) 3775 return; 3776 3777 // If property key exist then update with new value. 3778 SystemProperty* prop; 3779 for (prop = *plist; prop != NULL; prop = prop->next()) { 3780 if (strcmp(k, prop->key()) == 0) { 3781 if (append) { 3782 prop->append_value(v); 3783 } else { 3784 prop->set_value(v); 3785 } 3786 return; 3787 } 3788 } 3789 3790 PropertyList_add(plist, k, v); 3791} 3792 3793// Copies src into buf, replacing "%%" with "%" and "%p" with pid 3794// Returns true if all of the source pointed by src has been copied over to 3795// the destination buffer pointed by buf. Otherwise, returns false. 3796// Notes: 3797// 1. If the length (buflen) of the destination buffer excluding the 3798// NULL terminator character is not long enough for holding the expanded 3799// pid characters, it also returns false instead of returning the partially 3800// expanded one. 3801// 2. The passed in "buflen" should be large enough to hold the null terminator. 3802bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3803 char* buf, size_t buflen) { 3804 const char* p = src; 3805 char* b = buf; 3806 const char* src_end = &src[srclen]; 3807 char* buf_end = &buf[buflen - 1]; 3808 3809 while (p < src_end && b < buf_end) { 3810 if (*p == '%') { 3811 switch (*(++p)) { 3812 case '%': // "%%" ==> "%" 3813 *b++ = *p++; 3814 break; 3815 case 'p': { // "%p" ==> current process id 3816 // buf_end points to the character before the last character so 3817 // that we could write '\0' to the end of the buffer. 3818 size_t buf_sz = buf_end - b + 1; 3819 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3820 3821 // if jio_snprintf fails or the buffer is not long enough to hold 3822 // the expanded pid, returns false. 3823 if (ret < 0 || ret >= (int)buf_sz) { 3824 return false; 3825 } else { 3826 b += ret; 3827 assert(*b == '\0', "fail in copy_expand_pid"); 3828 if (p == src_end && b == buf_end + 1) { 3829 // reach the end of the buffer. 3830 return true; 3831 } 3832 } 3833 p++; 3834 break; 3835 } 3836 default : 3837 *b++ = '%'; 3838 } 3839 } else { 3840 *b++ = *p++; 3841 } 3842 } 3843 *b = '\0'; 3844 return (p == src_end); // return false if not all of the source was copied 3845} 3846