arguments.cpp revision 5909:5e1086b5b726
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::_sun_java_launcher_is_altjvm = 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, sun.java.launcher.is_altjvm or 155 // sun.java.launcher.pid is defined. 156 // Must do this before setting up other system properties, 157 // as some of them may depend on launcher type. 158 for (int index = 0; index < args->nOptions; index++) { 159 const JavaVMOption* option = args->options + index; 160 const char* tail; 161 162 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 163 process_java_launcher_argument(tail, option->extraInfo); 164 continue; 165 } 166 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 167 if (strcmp(tail, "true") == 0) { 168 _sun_java_launcher_is_altjvm = true; 169 } 170 continue; 171 } 172 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 173 _sun_java_launcher_pid = atoi(tail); 174 continue; 175 } 176 } 177} 178 179// Initialize system properties key and value. 180void Arguments::init_system_properties() { 181 182 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 183 "Java Virtual Machine Specification", false)); 184 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 185 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 186 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 187 188 // Following are JVMTI agent writable properties. 189 // Properties values are set to NULL and they are 190 // os specific they are initialized in os::init_system_properties_values(). 191 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 192 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 193 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 194 _java_library_path = new SystemProperty("java.library.path", NULL, true); 195 _java_home = new SystemProperty("java.home", NULL, true); 196 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 197 198 _java_class_path = new SystemProperty("java.class.path", "", true); 199 200 // Add to System Property list. 201 PropertyList_add(&_system_properties, _java_ext_dirs); 202 PropertyList_add(&_system_properties, _java_endorsed_dirs); 203 PropertyList_add(&_system_properties, _sun_boot_library_path); 204 PropertyList_add(&_system_properties, _java_library_path); 205 PropertyList_add(&_system_properties, _java_home); 206 PropertyList_add(&_system_properties, _java_class_path); 207 PropertyList_add(&_system_properties, _sun_boot_class_path); 208 209 // Set OS specific system properties values 210 os::init_system_properties_values(); 211} 212 213 214 // Update/Initialize System properties after JDK version number is known 215void Arguments::init_version_specific_system_properties() { 216 enum { bufsz = 16 }; 217 char buffer[bufsz]; 218 const char* spec_vendor = "Sun Microsystems Inc."; 219 uint32_t spec_version = 0; 220 221 if (JDK_Version::is_gte_jdk17x_version()) { 222 spec_vendor = "Oracle Corporation"; 223 spec_version = JDK_Version::current().major_version(); 224 } 225 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 226 227 PropertyList_add(&_system_properties, 228 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 229 PropertyList_add(&_system_properties, 230 new SystemProperty("java.vm.specification.version", buffer, false)); 231 PropertyList_add(&_system_properties, 232 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 233} 234 235/** 236 * Provide a slightly more user-friendly way of eliminating -XX flags. 237 * When a flag is eliminated, it can be added to this list in order to 238 * continue accepting this flag on the command-line, while issuing a warning 239 * and ignoring the value. Once the JDK version reaches the 'accept_until' 240 * limit, we flatly refuse to admit the existence of the flag. This allows 241 * a flag to die correctly over JDK releases using HSX. 242 */ 243typedef struct { 244 const char* name; 245 JDK_Version obsoleted_in; // when the flag went away 246 JDK_Version accept_until; // which version to start denying the existence 247} ObsoleteFlag; 248 249static ObsoleteFlag obsolete_jvm_flags[] = { 250 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 251 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 252 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 253 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 254 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 255 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 256 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 257 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 258 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 259 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 260 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 261 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 262 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 263 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 264 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 265 { "DefaultInitialRAMFraction", 266 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 267 { "UseDepthFirstScavengeOrder", 268 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 269 { "HandlePromotionFailure", 270 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 271 { "MaxLiveObjectEvacuationRatio", 272 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 273 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 274 { "UseParallelOldGCCompacting", 275 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 276 { "UseParallelDensePrefixUpdate", 277 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 278 { "UseParallelOldGCDensePrefix", 279 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 280 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 281 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 282 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 283 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 284 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 285 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 286 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 287 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 288 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 289 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 290 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 291 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 292 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 293 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 294 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 295 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 296 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 297 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 298 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 299 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 300#ifdef PRODUCT 301 { "DesiredMethodLimit", 302 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 303#endif // PRODUCT 304 { NULL, JDK_Version(0), JDK_Version(0) } 305}; 306 307// Returns true if the flag is obsolete and fits into the range specified 308// for being ignored. In the case that the flag is ignored, the 'version' 309// value is filled in with the version number when the flag became 310// obsolete so that that value can be displayed to the user. 311bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 312 int i = 0; 313 assert(version != NULL, "Must provide a version buffer"); 314 while (obsolete_jvm_flags[i].name != NULL) { 315 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 316 // <flag>=xxx form 317 // [-|+]<flag> form 318 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 319 ((s[0] == '+' || s[0] == '-') && 320 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 321 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 322 *version = flag_status.obsoleted_in; 323 return true; 324 } 325 } 326 i++; 327 } 328 return false; 329} 330 331// Constructs the system class path (aka boot class path) from the following 332// components, in order: 333// 334// prefix // from -Xbootclasspath/p:... 335// endorsed // the expansion of -Djava.endorsed.dirs=... 336// base // from os::get_system_properties() or -Xbootclasspath= 337// suffix // from -Xbootclasspath/a:... 338// 339// java.endorsed.dirs is a list of directories; any jar or zip files in the 340// directories are added to the sysclasspath just before the base. 341// 342// This could be AllStatic, but it isn't needed after argument processing is 343// complete. 344class SysClassPath: public StackObj { 345public: 346 SysClassPath(const char* base); 347 ~SysClassPath(); 348 349 inline void set_base(const char* base); 350 inline void add_prefix(const char* prefix); 351 inline void add_suffix_to_prefix(const char* suffix); 352 inline void add_suffix(const char* suffix); 353 inline void reset_path(const char* base); 354 355 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 356 // property. Must be called after all command-line arguments have been 357 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 358 // combined_path(). 359 void expand_endorsed(); 360 361 inline const char* get_base() const { return _items[_scp_base]; } 362 inline const char* get_prefix() const { return _items[_scp_prefix]; } 363 inline const char* get_suffix() const { return _items[_scp_suffix]; } 364 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 365 366 // Combine all the components into a single c-heap-allocated string; caller 367 // must free the string if/when no longer needed. 368 char* combined_path(); 369 370private: 371 // Utility routines. 372 static char* add_to_path(const char* path, const char* str, bool prepend); 373 static char* add_jars_to_path(char* path, const char* directory); 374 375 inline void reset_item_at(int index); 376 377 // Array indices for the items that make up the sysclasspath. All except the 378 // base are allocated in the C heap and freed by this class. 379 enum { 380 _scp_prefix, // from -Xbootclasspath/p:... 381 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 382 _scp_base, // the default sysclasspath 383 _scp_suffix, // from -Xbootclasspath/a:... 384 _scp_nitems // the number of items, must be last. 385 }; 386 387 const char* _items[_scp_nitems]; 388 DEBUG_ONLY(bool _expansion_done;) 389}; 390 391SysClassPath::SysClassPath(const char* base) { 392 memset(_items, 0, sizeof(_items)); 393 _items[_scp_base] = base; 394 DEBUG_ONLY(_expansion_done = false;) 395} 396 397SysClassPath::~SysClassPath() { 398 // Free everything except the base. 399 for (int i = 0; i < _scp_nitems; ++i) { 400 if (i != _scp_base) reset_item_at(i); 401 } 402 DEBUG_ONLY(_expansion_done = false;) 403} 404 405inline void SysClassPath::set_base(const char* base) { 406 _items[_scp_base] = base; 407} 408 409inline void SysClassPath::add_prefix(const char* prefix) { 410 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 411} 412 413inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 414 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 415} 416 417inline void SysClassPath::add_suffix(const char* suffix) { 418 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 419} 420 421inline void SysClassPath::reset_item_at(int index) { 422 assert(index < _scp_nitems && index != _scp_base, "just checking"); 423 if (_items[index] != NULL) { 424 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 425 _items[index] = NULL; 426 } 427} 428 429inline void SysClassPath::reset_path(const char* base) { 430 // Clear the prefix and suffix. 431 reset_item_at(_scp_prefix); 432 reset_item_at(_scp_suffix); 433 set_base(base); 434} 435 436//------------------------------------------------------------------------------ 437 438void SysClassPath::expand_endorsed() { 439 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 440 441 const char* path = Arguments::get_property("java.endorsed.dirs"); 442 if (path == NULL) { 443 path = Arguments::get_endorsed_dir(); 444 assert(path != NULL, "no default for java.endorsed.dirs"); 445 } 446 447 char* expanded_path = NULL; 448 const char separator = *os::path_separator(); 449 const char* const end = path + strlen(path); 450 while (path < end) { 451 const char* tmp_end = strchr(path, separator); 452 if (tmp_end == NULL) { 453 expanded_path = add_jars_to_path(expanded_path, path); 454 path = end; 455 } else { 456 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 457 memcpy(dirpath, path, tmp_end - path); 458 dirpath[tmp_end - path] = '\0'; 459 expanded_path = add_jars_to_path(expanded_path, dirpath); 460 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 461 path = tmp_end + 1; 462 } 463 } 464 _items[_scp_endorsed] = expanded_path; 465 DEBUG_ONLY(_expansion_done = true;) 466} 467 468// Combine the bootclasspath elements, some of which may be null, into a single 469// c-heap-allocated string. 470char* SysClassPath::combined_path() { 471 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 472 assert(_expansion_done, "must call expand_endorsed() first."); 473 474 size_t lengths[_scp_nitems]; 475 size_t total_len = 0; 476 477 const char separator = *os::path_separator(); 478 479 // Get the lengths. 480 int i; 481 for (i = 0; i < _scp_nitems; ++i) { 482 if (_items[i] != NULL) { 483 lengths[i] = strlen(_items[i]); 484 // Include space for the separator char (or a NULL for the last item). 485 total_len += lengths[i] + 1; 486 } 487 } 488 assert(total_len > 0, "empty sysclasspath not allowed"); 489 490 // Copy the _items to a single string. 491 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 492 char* cp_tmp = cp; 493 for (i = 0; i < _scp_nitems; ++i) { 494 if (_items[i] != NULL) { 495 memcpy(cp_tmp, _items[i], lengths[i]); 496 cp_tmp += lengths[i]; 497 *cp_tmp++ = separator; 498 } 499 } 500 *--cp_tmp = '\0'; // Replace the extra separator. 501 return cp; 502} 503 504// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 505char* 506SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 507 char *cp; 508 509 assert(str != NULL, "just checking"); 510 if (path == NULL) { 511 size_t len = strlen(str) + 1; 512 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 513 memcpy(cp, str, len); // copy the trailing null 514 } else { 515 const char separator = *os::path_separator(); 516 size_t old_len = strlen(path); 517 size_t str_len = strlen(str); 518 size_t len = old_len + str_len + 2; 519 520 if (prepend) { 521 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 522 char* cp_tmp = cp; 523 memcpy(cp_tmp, str, str_len); 524 cp_tmp += str_len; 525 *cp_tmp = separator; 526 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 527 FREE_C_HEAP_ARRAY(char, path, mtInternal); 528 } else { 529 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 530 char* cp_tmp = cp + old_len; 531 *cp_tmp = separator; 532 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 533 } 534 } 535 return cp; 536} 537 538// Scan the directory and append any jar or zip files found to path. 539// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 540char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 541 DIR* dir = os::opendir(directory); 542 if (dir == NULL) return path; 543 544 char dir_sep[2] = { '\0', '\0' }; 545 size_t directory_len = strlen(directory); 546 const char fileSep = *os::file_separator(); 547 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 548 549 /* Scan the directory for jars/zips, appending them to path. */ 550 struct dirent *entry; 551 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 552 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 553 const char* name = entry->d_name; 554 const char* ext = name + strlen(name) - 4; 555 bool isJarOrZip = ext > name && 556 (os::file_name_strcmp(ext, ".jar") == 0 || 557 os::file_name_strcmp(ext, ".zip") == 0); 558 if (isJarOrZip) { 559 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 560 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 561 path = add_to_path(path, jarpath, false); 562 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 563 } 564 } 565 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 566 os::closedir(dir); 567 return path; 568} 569 570// Parses a memory size specification string. 571static bool atomull(const char *s, julong* result) { 572 julong n = 0; 573 int args_read = sscanf(s, JULONG_FORMAT, &n); 574 if (args_read != 1) { 575 return false; 576 } 577 while (*s != '\0' && isdigit(*s)) { 578 s++; 579 } 580 // 4705540: illegal if more characters are found after the first non-digit 581 if (strlen(s) > 1) { 582 return false; 583 } 584 switch (*s) { 585 case 'T': case 't': 586 *result = n * G * K; 587 // Check for overflow. 588 if (*result/((julong)G * K) != n) return false; 589 return true; 590 case 'G': case 'g': 591 *result = n * G; 592 if (*result/G != n) return false; 593 return true; 594 case 'M': case 'm': 595 *result = n * M; 596 if (*result/M != n) return false; 597 return true; 598 case 'K': case 'k': 599 *result = n * K; 600 if (*result/K != n) return false; 601 return true; 602 case '\0': 603 *result = n; 604 return true; 605 default: 606 return false; 607 } 608} 609 610Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 611 if (size < min_size) return arg_too_small; 612 // Check that size will fit in a size_t (only relevant on 32-bit) 613 if (size > max_uintx) return arg_too_big; 614 return arg_in_range; 615} 616 617// Describe an argument out of range error 618void Arguments::describe_range_error(ArgsRange errcode) { 619 switch(errcode) { 620 case arg_too_big: 621 jio_fprintf(defaultStream::error_stream(), 622 "The specified size exceeds the maximum " 623 "representable size.\n"); 624 break; 625 case arg_too_small: 626 case arg_unreadable: 627 case arg_in_range: 628 // do nothing for now 629 break; 630 default: 631 ShouldNotReachHere(); 632 } 633} 634 635static bool set_bool_flag(char* name, bool value, Flag::Flags origin) { 636 return CommandLineFlags::boolAtPut(name, &value, origin); 637} 638 639static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 640 double v; 641 if (sscanf(value, "%lf", &v) != 1) { 642 return false; 643 } 644 645 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 646 return true; 647 } 648 return false; 649} 650 651static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 652 julong v; 653 intx intx_v; 654 bool is_neg = false; 655 // Check the sign first since atomull() parses only unsigned values. 656 if (*value == '-') { 657 if (!CommandLineFlags::intxAt(name, &intx_v)) { 658 return false; 659 } 660 value++; 661 is_neg = true; 662 } 663 if (!atomull(value, &v)) { 664 return false; 665 } 666 intx_v = (intx) v; 667 if (is_neg) { 668 intx_v = -intx_v; 669 } 670 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 671 return true; 672 } 673 uintx uintx_v = (uintx) v; 674 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 675 return true; 676 } 677 uint64_t uint64_t_v = (uint64_t) v; 678 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 679 return true; 680 } 681 return false; 682} 683 684static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 685 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 686 // Contract: CommandLineFlags always returns a pointer that needs freeing. 687 FREE_C_HEAP_ARRAY(char, value, mtInternal); 688 return true; 689} 690 691static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 692 const char* old_value = ""; 693 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 694 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 695 size_t new_len = strlen(new_value); 696 const char* value; 697 char* free_this_too = NULL; 698 if (old_len == 0) { 699 value = new_value; 700 } else if (new_len == 0) { 701 value = old_value; 702 } else { 703 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 704 // each new setting adds another LINE to the switch: 705 sprintf(buf, "%s\n%s", old_value, new_value); 706 value = buf; 707 free_this_too = buf; 708 } 709 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 710 // CommandLineFlags always returns a pointer that needs freeing. 711 FREE_C_HEAP_ARRAY(char, value, mtInternal); 712 if (free_this_too != NULL) { 713 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 714 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 715 } 716 return true; 717} 718 719bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 720 721 // range of acceptable characters spelled out for portability reasons 722#define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 723#define BUFLEN 255 724 char name[BUFLEN+1]; 725 char dummy; 726 727 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 728 return set_bool_flag(name, false, origin); 729 } 730 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 731 return set_bool_flag(name, true, origin); 732 } 733 734 char punct; 735 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 736 const char* value = strchr(arg, '=') + 1; 737 Flag* flag = Flag::find_flag(name, strlen(name)); 738 if (flag != NULL && flag->is_ccstr()) { 739 if (flag->ccstr_accumulates()) { 740 return append_to_string_flag(name, value, origin); 741 } else { 742 if (value[0] == '\0') { 743 value = NULL; 744 } 745 return set_string_flag(name, value, origin); 746 } 747 } 748 } 749 750 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 751 const char* value = strchr(arg, '=') + 1; 752 // -XX:Foo:=xxx will reset the string flag to the given value. 753 if (value[0] == '\0') { 754 value = NULL; 755 } 756 return set_string_flag(name, value, origin); 757 } 758 759#define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 760#define SIGNED_NUMBER_RANGE "[-0123456789]" 761#define NUMBER_RANGE "[0123456789]" 762 char value[BUFLEN + 1]; 763 char value2[BUFLEN + 1]; 764 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 765 // Looks like a floating-point number -- try again with more lenient format string 766 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 767 return set_fp_numeric_flag(name, value, origin); 768 } 769 } 770 771#define VALUE_RANGE "[-kmgtKMGT0123456789]" 772 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 773 return set_numeric_flag(name, value, origin); 774 } 775 776 return false; 777} 778 779void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 780 assert(bldarray != NULL, "illegal argument"); 781 782 if (arg == NULL) { 783 return; 784 } 785 786 int new_count = *count + 1; 787 788 // expand the array and add arg to the last element 789 if (*bldarray == NULL) { 790 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 791 } else { 792 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 793 } 794 (*bldarray)[*count] = strdup(arg); 795 *count = new_count; 796} 797 798void Arguments::build_jvm_args(const char* arg) { 799 add_string(&_jvm_args_array, &_num_jvm_args, arg); 800} 801 802void Arguments::build_jvm_flags(const char* arg) { 803 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 804} 805 806// utility function to return a string that concatenates all 807// strings in a given char** array 808const char* Arguments::build_resource_string(char** args, int count) { 809 if (args == NULL || count == 0) { 810 return NULL; 811 } 812 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 813 for (int i = 1; i < count; i++) { 814 length += strlen(args[i]) + 1; // add 1 for a space 815 } 816 char* s = NEW_RESOURCE_ARRAY(char, length); 817 strcpy(s, args[0]); 818 for (int j = 1; j < count; j++) { 819 strcat(s, " "); 820 strcat(s, args[j]); 821 } 822 return (const char*) s; 823} 824 825void Arguments::print_on(outputStream* st) { 826 st->print_cr("VM Arguments:"); 827 if (num_jvm_flags() > 0) { 828 st->print("jvm_flags: "); print_jvm_flags_on(st); 829 } 830 if (num_jvm_args() > 0) { 831 st->print("jvm_args: "); print_jvm_args_on(st); 832 } 833 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 834 if (_java_class_path != NULL) { 835 char* path = _java_class_path->value(); 836 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 837 } 838 st->print_cr("Launcher Type: %s", _sun_java_launcher); 839} 840 841void Arguments::print_jvm_flags_on(outputStream* st) { 842 if (_num_jvm_flags > 0) { 843 for (int i=0; i < _num_jvm_flags; i++) { 844 st->print("%s ", _jvm_flags_array[i]); 845 } 846 st->print_cr(""); 847 } 848} 849 850void Arguments::print_jvm_args_on(outputStream* st) { 851 if (_num_jvm_args > 0) { 852 for (int i=0; i < _num_jvm_args; i++) { 853 st->print("%s ", _jvm_args_array[i]); 854 } 855 st->print_cr(""); 856 } 857} 858 859bool Arguments::process_argument(const char* arg, 860 jboolean ignore_unrecognized, Flag::Flags origin) { 861 862 JDK_Version since = JDK_Version(); 863 864 if (parse_argument(arg, origin) || ignore_unrecognized) { 865 return true; 866 } 867 868 bool has_plus_minus = (*arg == '+' || *arg == '-'); 869 const char* const argname = has_plus_minus ? arg + 1 : arg; 870 if (is_newly_obsolete(arg, &since)) { 871 char version[256]; 872 since.to_string(version, sizeof(version)); 873 warning("ignoring option %s; support was removed in %s", argname, version); 874 return true; 875 } 876 877 // For locked flags, report a custom error message if available. 878 // Otherwise, report the standard unrecognized VM option. 879 880 size_t arg_len; 881 const char* equal_sign = strchr(argname, '='); 882 if (equal_sign == NULL) { 883 arg_len = strlen(argname); 884 } else { 885 arg_len = equal_sign - argname; 886 } 887 888 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 889 if (found_flag != NULL) { 890 char locked_message_buf[BUFLEN]; 891 found_flag->get_locked_message(locked_message_buf, BUFLEN); 892 if (strlen(locked_message_buf) == 0) { 893 if (found_flag->is_bool() && !has_plus_minus) { 894 jio_fprintf(defaultStream::error_stream(), 895 "Missing +/- setting for VM option '%s'\n", argname); 896 } else if (!found_flag->is_bool() && has_plus_minus) { 897 jio_fprintf(defaultStream::error_stream(), 898 "Unexpected +/- setting in VM option '%s'\n", argname); 899 } else { 900 jio_fprintf(defaultStream::error_stream(), 901 "Improperly specified VM option '%s'\n", argname); 902 } 903 } else { 904 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 905 } 906 } else { 907 jio_fprintf(defaultStream::error_stream(), 908 "Unrecognized VM option '%s'\n", argname); 909 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 910 if (fuzzy_matched != NULL) { 911 jio_fprintf(defaultStream::error_stream(), 912 "Did you mean '%s%s%s'?\n", 913 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 914 fuzzy_matched->_name, 915 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 916 } 917 } 918 919 // allow for commandline "commenting out" options like -XX:#+Verbose 920 return arg[0] == '#'; 921} 922 923bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 924 FILE* stream = fopen(file_name, "rb"); 925 if (stream == NULL) { 926 if (should_exist) { 927 jio_fprintf(defaultStream::error_stream(), 928 "Could not open settings file %s\n", file_name); 929 return false; 930 } else { 931 return true; 932 } 933 } 934 935 char token[1024]; 936 int pos = 0; 937 938 bool in_white_space = true; 939 bool in_comment = false; 940 bool in_quote = false; 941 char quote_c = 0; 942 bool result = true; 943 944 int c = getc(stream); 945 while(c != EOF && pos < (int)(sizeof(token)-1)) { 946 if (in_white_space) { 947 if (in_comment) { 948 if (c == '\n') in_comment = false; 949 } else { 950 if (c == '#') in_comment = true; 951 else if (!isspace(c)) { 952 in_white_space = false; 953 token[pos++] = c; 954 } 955 } 956 } else { 957 if (c == '\n' || (!in_quote && isspace(c))) { 958 // token ends at newline, or at unquoted whitespace 959 // this allows a way to include spaces in string-valued options 960 token[pos] = '\0'; 961 logOption(token); 962 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 963 build_jvm_flags(token); 964 pos = 0; 965 in_white_space = true; 966 in_quote = false; 967 } else if (!in_quote && (c == '\'' || c == '"')) { 968 in_quote = true; 969 quote_c = c; 970 } else if (in_quote && (c == quote_c)) { 971 in_quote = false; 972 } else { 973 token[pos++] = c; 974 } 975 } 976 c = getc(stream); 977 } 978 if (pos > 0) { 979 token[pos] = '\0'; 980 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 981 build_jvm_flags(token); 982 } 983 fclose(stream); 984 return result; 985} 986 987//============================================================================================================= 988// Parsing of properties (-D) 989 990const char* Arguments::get_property(const char* key) { 991 return PropertyList_get_value(system_properties(), key); 992} 993 994bool Arguments::add_property(const char* prop) { 995 const char* eq = strchr(prop, '='); 996 char* key; 997 // ns must be static--its address may be stored in a SystemProperty object. 998 const static char ns[1] = {0}; 999 char* value = (char *)ns; 1000 1001 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 1002 key = AllocateHeap(key_len + 1, mtInternal); 1003 strncpy(key, prop, key_len); 1004 key[key_len] = '\0'; 1005 1006 if (eq != NULL) { 1007 size_t value_len = strlen(prop) - key_len - 1; 1008 value = AllocateHeap(value_len + 1, mtInternal); 1009 strncpy(value, &prop[key_len + 1], value_len + 1); 1010 } 1011 1012 if (strcmp(key, "java.compiler") == 0) { 1013 process_java_compiler_argument(value); 1014 FreeHeap(key); 1015 if (eq != NULL) { 1016 FreeHeap(value); 1017 } 1018 return true; 1019 } else if (strcmp(key, "sun.java.command") == 0) { 1020 _java_command = value; 1021 1022 // Record value in Arguments, but let it get passed to Java. 1023 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1024 strcmp(key, "sun.java.launcher.pid") == 0) { 1025 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1026 // private and are processed in process_sun_java_launcher_properties(); 1027 // the sun.java.launcher property is passed on to the java application 1028 FreeHeap(key); 1029 if (eq != NULL) { 1030 FreeHeap(value); 1031 } 1032 return true; 1033 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1034 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1035 // its value without going through the property list or making a Java call. 1036 _java_vendor_url_bug = value; 1037 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1038 PropertyList_unique_add(&_system_properties, key, value, true); 1039 return true; 1040 } 1041 // Create new property and add at the end of the list 1042 PropertyList_unique_add(&_system_properties, key, value); 1043 return true; 1044} 1045 1046//=========================================================================================================== 1047// Setting int/mixed/comp mode flags 1048 1049void Arguments::set_mode_flags(Mode mode) { 1050 // Set up default values for all flags. 1051 // If you add a flag to any of the branches below, 1052 // add a default value for it here. 1053 set_java_compiler(false); 1054 _mode = mode; 1055 1056 // Ensure Agent_OnLoad has the correct initial values. 1057 // This may not be the final mode; mode may change later in onload phase. 1058 PropertyList_unique_add(&_system_properties, "java.vm.info", 1059 (char*)VM_Version::vm_info_string(), false); 1060 1061 UseInterpreter = true; 1062 UseCompiler = true; 1063 UseLoopCounter = true; 1064 1065#ifndef ZERO 1066 // Turn these off for mixed and comp. Leave them on for Zero. 1067 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) { 1068 UseFastAccessorMethods = (mode == _int); 1069 } 1070 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) { 1071 UseFastEmptyMethods = (mode == _int); 1072 } 1073#endif 1074 1075 // Default values may be platform/compiler dependent - 1076 // use the saved values 1077 ClipInlining = Arguments::_ClipInlining; 1078 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1079 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1080 BackgroundCompilation = Arguments::_BackgroundCompilation; 1081 1082 // Change from defaults based on mode 1083 switch (mode) { 1084 default: 1085 ShouldNotReachHere(); 1086 break; 1087 case _int: 1088 UseCompiler = false; 1089 UseLoopCounter = false; 1090 AlwaysCompileLoopMethods = false; 1091 UseOnStackReplacement = false; 1092 break; 1093 case _mixed: 1094 // same as default 1095 break; 1096 case _comp: 1097 UseInterpreter = false; 1098 BackgroundCompilation = false; 1099 ClipInlining = false; 1100 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1101 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1102 // compile a level 4 (C2) and then continue executing it. 1103 if (TieredCompilation) { 1104 Tier3InvokeNotifyFreqLog = 0; 1105 Tier4InvocationThreshold = 0; 1106 } 1107 break; 1108 } 1109} 1110 1111#if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1112// Conflict: required to use shared spaces (-Xshare:on), but 1113// incompatible command line options were chosen. 1114 1115static void no_shared_spaces() { 1116 if (RequireSharedSpaces) { 1117 jio_fprintf(defaultStream::error_stream(), 1118 "Class data sharing is inconsistent with other specified options.\n"); 1119 vm_exit_during_initialization("Unable to use shared archive.", NULL); 1120 } else { 1121 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1122 } 1123} 1124#endif 1125 1126void Arguments::set_tiered_flags() { 1127 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1128 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1129 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1130 } 1131 if (CompilationPolicyChoice < 2) { 1132 vm_exit_during_initialization( 1133 "Incompatible compilation policy selected", NULL); 1134 } 1135 // Increase the code cache size - tiered compiles a lot more. 1136 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1137 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5); 1138 } 1139 if (!UseInterpreter) { // -Xcomp 1140 Tier3InvokeNotifyFreqLog = 0; 1141 Tier4InvocationThreshold = 0; 1142 } 1143} 1144 1145#if INCLUDE_ALL_GCS 1146static void disable_adaptive_size_policy(const char* collector_name) { 1147 if (UseAdaptiveSizePolicy) { 1148 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1149 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1150 collector_name); 1151 } 1152 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1153 } 1154} 1155 1156void Arguments::set_parnew_gc_flags() { 1157 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1158 "control point invariant"); 1159 assert(UseParNewGC, "Error"); 1160 1161 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1162 disable_adaptive_size_policy("UseParNewGC"); 1163 1164 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1165 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1166 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1167 } else if (ParallelGCThreads == 0) { 1168 jio_fprintf(defaultStream::error_stream(), 1169 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1170 vm_exit(1); 1171 } 1172 1173 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1174 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1175 // we set them to 1024 and 1024. 1176 // See CR 6362902. 1177 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1178 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1179 } 1180 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1181 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1182 } 1183 1184 // AlwaysTenure flag should make ParNew promote all at first collection. 1185 // See CR 6362902. 1186 if (AlwaysTenure) { 1187 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 1188 } 1189 // When using compressed oops, we use local overflow stacks, 1190 // rather than using a global overflow list chained through 1191 // the klass word of the object's pre-image. 1192 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1193 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1194 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1195 } 1196 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1197 } 1198 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1199} 1200 1201// Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1202// sparc/solaris for certain applications, but would gain from 1203// further optimization and tuning efforts, and would almost 1204// certainly gain from analysis of platform and environment. 1205void Arguments::set_cms_and_parnew_gc_flags() { 1206 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1207 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1208 1209 // If we are using CMS, we prefer to UseParNewGC, 1210 // unless explicitly forbidden. 1211 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1212 FLAG_SET_ERGO(bool, UseParNewGC, true); 1213 } 1214 1215 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1216 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1217 1218 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1219 // as needed. 1220 if (UseParNewGC) { 1221 set_parnew_gc_flags(); 1222 } 1223 1224 size_t max_heap = align_size_down(MaxHeapSize, 1225 CardTableRS::ct_max_alignment_constraint()); 1226 1227 // Now make adjustments for CMS 1228 intx tenuring_default = (intx)6; 1229 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1230 1231 // Preferred young gen size for "short" pauses: 1232 // upper bound depends on # of threads and NewRatio. 1233 const uintx parallel_gc_threads = 1234 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1235 const size_t preferred_max_new_size_unaligned = 1236 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1237 size_t preferred_max_new_size = 1238 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1239 1240 // Unless explicitly requested otherwise, size young gen 1241 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1242 1243 // If either MaxNewSize or NewRatio is set on the command line, 1244 // assume the user is trying to set the size of the young gen. 1245 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1246 1247 // Set MaxNewSize to our calculated preferred_max_new_size unless 1248 // NewSize was set on the command line and it is larger than 1249 // preferred_max_new_size. 1250 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1251 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1252 } else { 1253 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1254 } 1255 if (PrintGCDetails && Verbose) { 1256 // Too early to use gclog_or_tty 1257 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1258 } 1259 1260 // Code along this path potentially sets NewSize and OldSize 1261 if (PrintGCDetails && Verbose) { 1262 // Too early to use gclog_or_tty 1263 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1264 " initial_heap_size: " SIZE_FORMAT 1265 " max_heap: " SIZE_FORMAT, 1266 min_heap_size(), InitialHeapSize, max_heap); 1267 } 1268 size_t min_new = preferred_max_new_size; 1269 if (FLAG_IS_CMDLINE(NewSize)) { 1270 min_new = NewSize; 1271 } 1272 if (max_heap > min_new && min_heap_size() > min_new) { 1273 // Unless explicitly requested otherwise, make young gen 1274 // at least min_new, and at most preferred_max_new_size. 1275 if (FLAG_IS_DEFAULT(NewSize)) { 1276 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1277 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1278 if (PrintGCDetails && Verbose) { 1279 // Too early to use gclog_or_tty 1280 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1281 } 1282 } 1283 // Unless explicitly requested otherwise, size old gen 1284 // so it's NewRatio x of NewSize. 1285 if (FLAG_IS_DEFAULT(OldSize)) { 1286 if (max_heap > NewSize) { 1287 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1288 if (PrintGCDetails && Verbose) { 1289 // Too early to use gclog_or_tty 1290 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1291 } 1292 } 1293 } 1294 } 1295 } 1296 // Unless explicitly requested otherwise, definitely 1297 // promote all objects surviving "tenuring_default" scavenges. 1298 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1299 FLAG_IS_DEFAULT(SurvivorRatio)) { 1300 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1301 } 1302 // If we decided above (or user explicitly requested) 1303 // `promote all' (via MaxTenuringThreshold := 0), 1304 // prefer minuscule survivor spaces so as not to waste 1305 // space for (non-existent) survivors 1306 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1307 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1308 } 1309 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1310 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1311 // This is done in order to make ParNew+CMS configuration to work 1312 // with YoungPLABSize and OldPLABSize options. 1313 // See CR 6362902. 1314 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1315 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1316 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1317 // is. In this situation let CMSParPromoteBlocksToClaim follow 1318 // the value (either from the command line or ergonomics) of 1319 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1320 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1321 } else { 1322 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1323 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1324 // we'll let it to take precedence. 1325 jio_fprintf(defaultStream::error_stream(), 1326 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1327 " options are specified for the CMS collector." 1328 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1329 } 1330 } 1331 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1332 // OldPLAB sizing manually turned off: Use a larger default setting, 1333 // unless it was manually specified. This is because a too-low value 1334 // will slow down scavenges. 1335 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1336 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1337 } 1338 } 1339 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1340 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1341 // If either of the static initialization defaults have changed, note this 1342 // modification. 1343 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1344 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1345 } 1346 if (PrintGCDetails && Verbose) { 1347 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1348 MarkStackSize / K, MarkStackSizeMax / K); 1349 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1350 } 1351} 1352#endif // INCLUDE_ALL_GCS 1353 1354void set_object_alignment() { 1355 // Object alignment. 1356 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1357 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1358 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1359 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1360 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1361 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1362 1363 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1364 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1365 1366 // Oop encoding heap max 1367 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1368 1369#if INCLUDE_ALL_GCS 1370 // Set CMS global values 1371 CompactibleFreeListSpace::set_cms_values(); 1372#endif // INCLUDE_ALL_GCS 1373} 1374 1375bool verify_object_alignment() { 1376 // Object alignment. 1377 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1378 jio_fprintf(defaultStream::error_stream(), 1379 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1380 (int)ObjectAlignmentInBytes); 1381 return false; 1382 } 1383 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1384 jio_fprintf(defaultStream::error_stream(), 1385 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1386 (int)ObjectAlignmentInBytes, BytesPerLong); 1387 return false; 1388 } 1389 // It does not make sense to have big object alignment 1390 // since a space lost due to alignment will be greater 1391 // then a saved space from compressed oops. 1392 if ((int)ObjectAlignmentInBytes > 256) { 1393 jio_fprintf(defaultStream::error_stream(), 1394 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1395 (int)ObjectAlignmentInBytes); 1396 return false; 1397 } 1398 // In case page size is very small. 1399 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1400 jio_fprintf(defaultStream::error_stream(), 1401 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1402 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1403 return false; 1404 } 1405 return true; 1406} 1407 1408uintx Arguments::max_heap_for_compressed_oops() { 1409 // Avoid sign flip. 1410 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1411 // We need to fit both the NULL page and the heap into the memory budget, while 1412 // keeping alignment constraints of the heap. To guarantee the latter, as the 1413 // NULL page is located before the heap, we pad the NULL page to the conservative 1414 // maximum alignment that the GC may ever impose upon the heap. 1415 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1416 _conservative_max_heap_alignment); 1417 1418 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1419 NOT_LP64(ShouldNotReachHere(); return 0); 1420} 1421 1422bool Arguments::should_auto_select_low_pause_collector() { 1423 if (UseAutoGCSelectPolicy && 1424 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1425 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1426 if (PrintGCDetails) { 1427 // Cannot use gclog_or_tty yet. 1428 tty->print_cr("Automatic selection of the low pause collector" 1429 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1430 } 1431 return true; 1432 } 1433 return false; 1434} 1435 1436void Arguments::set_use_compressed_oops() { 1437#ifndef ZERO 1438#ifdef _LP64 1439 // MaxHeapSize is not set up properly at this point, but 1440 // the only value that can override MaxHeapSize if we are 1441 // to use UseCompressedOops is InitialHeapSize. 1442 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1443 1444 if (max_heap_size <= max_heap_for_compressed_oops()) { 1445#if !defined(COMPILER1) || defined(TIERED) 1446 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1447 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1448 } 1449#endif 1450#ifdef _WIN64 1451 if (UseLargePages && UseCompressedOops) { 1452 // Cannot allocate guard pages for implicit checks in indexed addressing 1453 // mode, when large pages are specified on windows. 1454 // This flag could be switched ON if narrow oop base address is set to 0, 1455 // see code in Universe::initialize_heap(). 1456 Universe::set_narrow_oop_use_implicit_null_checks(false); 1457 } 1458#endif // _WIN64 1459 } else { 1460 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1461 warning("Max heap size too large for Compressed Oops"); 1462 FLAG_SET_DEFAULT(UseCompressedOops, false); 1463 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1464 } 1465 } 1466#endif // _LP64 1467#endif // ZERO 1468} 1469 1470 1471// NOTE: set_use_compressed_klass_ptrs() must be called after calling 1472// set_use_compressed_oops(). 1473void Arguments::set_use_compressed_klass_ptrs() { 1474#ifndef ZERO 1475#ifdef _LP64 1476 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1477 if (!UseCompressedOops) { 1478 if (UseCompressedClassPointers) { 1479 warning("UseCompressedClassPointers requires UseCompressedOops"); 1480 } 1481 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1482 } else { 1483 // Turn on UseCompressedClassPointers too 1484 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1485 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1486 } 1487 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1488 if (UseCompressedClassPointers) { 1489 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1490 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1491 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1492 } 1493 } 1494 } 1495#endif // _LP64 1496#endif // !ZERO 1497} 1498 1499void Arguments::set_conservative_max_heap_alignment() { 1500 // The conservative maximum required alignment for the heap is the maximum of 1501 // the alignments imposed by several sources: any requirements from the heap 1502 // itself, the collector policy and the maximum page size we may run the VM 1503 // with. 1504 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1505#if INCLUDE_ALL_GCS 1506 if (UseParallelGC) { 1507 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1508 } else if (UseG1GC) { 1509 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1510 } 1511#endif // INCLUDE_ALL_GCS 1512 _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(), 1513 CollectorPolicy::compute_heap_alignment()); 1514} 1515 1516void Arguments::set_ergonomics_flags() { 1517 1518 if (os::is_server_class_machine()) { 1519 // If no other collector is requested explicitly, 1520 // let the VM select the collector based on 1521 // machine class and automatic selection policy. 1522 if (!UseSerialGC && 1523 !UseConcMarkSweepGC && 1524 !UseG1GC && 1525 !UseParNewGC && 1526 FLAG_IS_DEFAULT(UseParallelGC)) { 1527 if (should_auto_select_low_pause_collector()) { 1528 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1529 } else { 1530 FLAG_SET_ERGO(bool, UseParallelGC, true); 1531 } 1532 } 1533 } 1534#ifdef COMPILER2 1535 // Shared spaces work fine with other GCs but causes bytecode rewriting 1536 // to be disabled, which hurts interpreter performance and decreases 1537 // server performance. When -server is specified, keep the default off 1538 // unless it is asked for. Future work: either add bytecode rewriting 1539 // at link time, or rewrite bytecodes in non-shared methods. 1540 if (!DumpSharedSpaces && !RequireSharedSpaces && 1541 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1542 no_shared_spaces(); 1543 } 1544#endif 1545 1546 set_conservative_max_heap_alignment(); 1547 1548#ifndef ZERO 1549#ifdef _LP64 1550 set_use_compressed_oops(); 1551 1552 // set_use_compressed_klass_ptrs() must be called after calling 1553 // set_use_compressed_oops(). 1554 set_use_compressed_klass_ptrs(); 1555 1556 // Also checks that certain machines are slower with compressed oops 1557 // in vm_version initialization code. 1558#endif // _LP64 1559#endif // !ZERO 1560} 1561 1562void Arguments::set_parallel_gc_flags() { 1563 assert(UseParallelGC || UseParallelOldGC, "Error"); 1564 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1565 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1566 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1567 } 1568 FLAG_SET_DEFAULT(UseParallelGC, true); 1569 1570 // If no heap maximum was requested explicitly, use some reasonable fraction 1571 // of the physical memory, up to a maximum of 1GB. 1572 FLAG_SET_DEFAULT(ParallelGCThreads, 1573 Abstract_VM_Version::parallel_worker_threads()); 1574 if (ParallelGCThreads == 0) { 1575 jio_fprintf(defaultStream::error_stream(), 1576 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1577 vm_exit(1); 1578 } 1579 1580 if (UseAdaptiveSizePolicy) { 1581 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1582 // unless the user actually sets these flags. 1583 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1584 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1585 } 1586 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1587 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1588 } 1589 } 1590 1591 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1592 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1593 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1594 // See CR 6362902 for details. 1595 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1596 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1597 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1598 } 1599 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1600 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1601 } 1602 } 1603 1604 if (UseParallelOldGC) { 1605 // Par compact uses lower default values since they are treated as 1606 // minimums. These are different defaults because of the different 1607 // interpretation and are not ergonomically set. 1608 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1609 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1610 } 1611 } 1612} 1613 1614void Arguments::set_g1_gc_flags() { 1615 assert(UseG1GC, "Error"); 1616#ifdef COMPILER1 1617 FastTLABRefill = false; 1618#endif 1619 FLAG_SET_DEFAULT(ParallelGCThreads, 1620 Abstract_VM_Version::parallel_worker_threads()); 1621 if (ParallelGCThreads == 0) { 1622 FLAG_SET_DEFAULT(ParallelGCThreads, 1623 Abstract_VM_Version::parallel_worker_threads()); 1624 } 1625 1626 // MarkStackSize will be set (if it hasn't been set by the user) 1627 // when concurrent marking is initialized. 1628 // Its value will be based upon the number of parallel marking threads. 1629 // But we do set the maximum mark stack size here. 1630 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1631 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1632 } 1633 1634 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1635 // In G1, we want the default GC overhead goal to be higher than 1636 // say in PS. So we set it here to 10%. Otherwise the heap might 1637 // be expanded more aggressively than we would like it to. In 1638 // fact, even 10% seems to not be high enough in some cases 1639 // (especially small GC stress tests that the main thing they do 1640 // is allocation). We might consider increase it further. 1641 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1642 } 1643 1644 if (PrintGCDetails && Verbose) { 1645 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1646 MarkStackSize / K, MarkStackSizeMax / K); 1647 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1648 } 1649} 1650 1651julong Arguments::limit_by_allocatable_memory(julong limit) { 1652 julong max_allocatable; 1653 julong result = limit; 1654 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1655 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1656 } 1657 return result; 1658} 1659 1660void Arguments::set_heap_size() { 1661 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1662 // Deprecated flag 1663 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1664 } 1665 1666 const julong phys_mem = 1667 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1668 : (julong)MaxRAM; 1669 1670 // If the maximum heap size has not been set with -Xmx, 1671 // then set it as fraction of the size of physical memory, 1672 // respecting the maximum and minimum sizes of the heap. 1673 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1674 julong reasonable_max = phys_mem / MaxRAMFraction; 1675 1676 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1677 // Small physical memory, so use a minimum fraction of it for the heap 1678 reasonable_max = phys_mem / MinRAMFraction; 1679 } else { 1680 // Not-small physical memory, so require a heap at least 1681 // as large as MaxHeapSize 1682 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1683 } 1684 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1685 // Limit the heap size to ErgoHeapSizeLimit 1686 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1687 } 1688 if (UseCompressedOops) { 1689 // Limit the heap size to the maximum possible when using compressed oops 1690 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1691 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1692 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1693 // but it should be not less than default MaxHeapSize. 1694 max_coop_heap -= HeapBaseMinAddress; 1695 } 1696 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1697 } 1698 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1699 1700 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1701 // An initial heap size was specified on the command line, 1702 // so be sure that the maximum size is consistent. Done 1703 // after call to limit_by_allocatable_memory because that 1704 // method might reduce the allocation size. 1705 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1706 } 1707 1708 if (PrintGCDetails && Verbose) { 1709 // Cannot use gclog_or_tty yet. 1710 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1711 } 1712 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1713 } 1714 1715 // If the minimum or initial heap_size have not been set or requested to be set 1716 // ergonomically, set them accordingly. 1717 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1718 julong reasonable_minimum = (julong)(OldSize + NewSize); 1719 1720 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1721 1722 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1723 1724 if (InitialHeapSize == 0) { 1725 julong reasonable_initial = phys_mem / InitialRAMFraction; 1726 1727 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1728 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1729 1730 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1731 1732 if (PrintGCDetails && Verbose) { 1733 // Cannot use gclog_or_tty yet. 1734 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1735 } 1736 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1737 } 1738 // If the minimum heap size has not been set (via -Xms), 1739 // synchronize with InitialHeapSize to avoid errors with the default value. 1740 if (min_heap_size() == 0) { 1741 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1742 if (PrintGCDetails && Verbose) { 1743 // Cannot use gclog_or_tty yet. 1744 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1745 } 1746 } 1747 } 1748} 1749 1750// This must be called after ergonomics because we want bytecode rewriting 1751// if the server compiler is used, or if UseSharedSpaces is disabled. 1752void Arguments::set_bytecode_flags() { 1753 // Better not attempt to store into a read-only space. 1754 if (UseSharedSpaces) { 1755 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1756 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1757 } 1758 1759 if (!RewriteBytecodes) { 1760 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1761 } 1762} 1763 1764// Aggressive optimization flags -XX:+AggressiveOpts 1765void Arguments::set_aggressive_opts_flags() { 1766#ifdef COMPILER2 1767 if (AggressiveUnboxing) { 1768 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1769 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1770 } else if (!EliminateAutoBox) { 1771 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1772 AggressiveUnboxing = false; 1773 } 1774 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1775 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1776 } else if (!DoEscapeAnalysis) { 1777 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1778 AggressiveUnboxing = false; 1779 } 1780 } 1781 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1782 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1783 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1784 } 1785 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1786 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1787 } 1788 1789 // Feed the cache size setting into the JDK 1790 char buffer[1024]; 1791 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1792 add_property(buffer); 1793 } 1794 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1795 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1796 } 1797#endif 1798 1799 if (AggressiveOpts) { 1800// Sample flag setting code 1801// if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1802// FLAG_SET_DEFAULT(EliminateZeroing, true); 1803// } 1804 } 1805} 1806 1807//=========================================================================================================== 1808// Parsing of java.compiler property 1809 1810void Arguments::process_java_compiler_argument(char* arg) { 1811 // For backwards compatibility, Djava.compiler=NONE or "" 1812 // causes us to switch to -Xint mode UNLESS -Xdebug 1813 // is also specified. 1814 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1815 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1816 } 1817} 1818 1819void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1820 _sun_java_launcher = strdup(launcher); 1821} 1822 1823bool Arguments::created_by_java_launcher() { 1824 assert(_sun_java_launcher != NULL, "property must have value"); 1825 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1826} 1827 1828bool Arguments::sun_java_launcher_is_altjvm() { 1829 return _sun_java_launcher_is_altjvm; 1830} 1831 1832//=========================================================================================================== 1833// Parsing of main arguments 1834 1835bool Arguments::verify_interval(uintx val, uintx min, 1836 uintx max, const char* name) { 1837 // Returns true iff value is in the inclusive interval [min..max] 1838 // false, otherwise. 1839 if (val >= min && val <= max) { 1840 return true; 1841 } 1842 jio_fprintf(defaultStream::error_stream(), 1843 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1844 " and " UINTX_FORMAT "\n", 1845 name, val, min, max); 1846 return false; 1847} 1848 1849bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1850 // Returns true if given value is at least specified min threshold 1851 // false, otherwise. 1852 if (val >= min ) { 1853 return true; 1854 } 1855 jio_fprintf(defaultStream::error_stream(), 1856 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1857 name, val, min); 1858 return false; 1859} 1860 1861bool Arguments::verify_percentage(uintx value, const char* name) { 1862 if (is_percentage(value)) { 1863 return true; 1864 } 1865 jio_fprintf(defaultStream::error_stream(), 1866 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1867 name, value); 1868 return false; 1869} 1870 1871#if !INCLUDE_ALL_GCS 1872#ifdef ASSERT 1873static bool verify_serial_gc_flags() { 1874 return (UseSerialGC && 1875 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1876 UseParallelGC || UseParallelOldGC)); 1877} 1878#endif // ASSERT 1879#endif // INCLUDE_ALL_GCS 1880 1881// check if do gclog rotation 1882// +UseGCLogFileRotation is a must, 1883// no gc log rotation when log file not supplied or 1884// NumberOfGCLogFiles is 0, or GCLogFileSize is 0 1885void check_gclog_consistency() { 1886 if (UseGCLogFileRotation) { 1887 if ((Arguments::gc_log_filename() == NULL) || 1888 (NumberOfGCLogFiles == 0) || 1889 (GCLogFileSize == 0)) { 1890 jio_fprintf(defaultStream::output_stream(), 1891 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>[k|K|m|M|g|G]\n" 1892 "where num_of_file > 0 and num_of_size > 0\n" 1893 "GC log rotation is turned off\n"); 1894 UseGCLogFileRotation = false; 1895 } 1896 } 1897 1898 if (UseGCLogFileRotation && GCLogFileSize < 8*K) { 1899 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1900 jio_fprintf(defaultStream::output_stream(), 1901 "GCLogFileSize changed to minimum 8K\n"); 1902 } 1903} 1904 1905// This function is called for -Xloggc:<filename>, it can be used 1906// to check if a given file name(or string) conforms to the following 1907// specification: 1908// A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 1909// %p and %t only allowed once. We only limit usage of filename not path 1910bool is_filename_valid(const char *file_name) { 1911 const char* p = file_name; 1912 char file_sep = os::file_separator()[0]; 1913 const char* cp; 1914 // skip prefix path 1915 for (cp = file_name; *cp != '\0'; cp++) { 1916 if (*cp == '/' || *cp == file_sep) { 1917 p = cp + 1; 1918 } 1919 } 1920 1921 int count_p = 0; 1922 int count_t = 0; 1923 while (*p != '\0') { 1924 if ((*p >= '0' && *p <= '9') || 1925 (*p >= 'A' && *p <= 'Z') || 1926 (*p >= 'a' && *p <= 'z') || 1927 *p == '-' || 1928 *p == '_' || 1929 *p == '.') { 1930 p++; 1931 continue; 1932 } 1933 if (*p == '%') { 1934 if(*(p + 1) == 'p') { 1935 p += 2; 1936 count_p ++; 1937 continue; 1938 } 1939 if (*(p + 1) == 't') { 1940 p += 2; 1941 count_t ++; 1942 continue; 1943 } 1944 } 1945 return false; 1946 } 1947 return count_p < 2 && count_t < 2; 1948} 1949 1950bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) { 1951 if (!is_percentage(min_heap_free_ratio)) { 1952 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100"); 1953 return false; 1954 } 1955 if (min_heap_free_ratio > MaxHeapFreeRatio) { 1956 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1957 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio, 1958 MaxHeapFreeRatio); 1959 return false; 1960 } 1961 return true; 1962} 1963 1964bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) { 1965 if (!is_percentage(max_heap_free_ratio)) { 1966 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100"); 1967 return false; 1968 } 1969 if (max_heap_free_ratio < MinHeapFreeRatio) { 1970 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or " 1971 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio, 1972 MinHeapFreeRatio); 1973 return false; 1974 } 1975 return true; 1976} 1977 1978// Check consistency of GC selection 1979bool Arguments::check_gc_consistency() { 1980 check_gclog_consistency(); 1981 bool status = true; 1982 // Ensure that the user has not selected conflicting sets 1983 // of collectors. [Note: this check is merely a user convenience; 1984 // collectors over-ride each other so that only a non-conflicting 1985 // set is selected; however what the user gets is not what they 1986 // may have expected from the combination they asked for. It's 1987 // better to reduce user confusion by not allowing them to 1988 // select conflicting combinations. 1989 uint i = 0; 1990 if (UseSerialGC) i++; 1991 if (UseConcMarkSweepGC || UseParNewGC) i++; 1992 if (UseParallelGC || UseParallelOldGC) i++; 1993 if (UseG1GC) i++; 1994 if (i > 1) { 1995 jio_fprintf(defaultStream::error_stream(), 1996 "Conflicting collector combinations in option list; " 1997 "please refer to the release notes for the combinations " 1998 "allowed\n"); 1999 status = false; 2000 } 2001 return status; 2002} 2003 2004void Arguments::check_deprecated_gcs() { 2005 if (UseConcMarkSweepGC && !UseParNewGC) { 2006 warning("Using the DefNew young collector with the CMS collector is deprecated " 2007 "and will likely be removed in a future release"); 2008 } 2009 2010 if (UseParNewGC && !UseConcMarkSweepGC) { 2011 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 2012 // set up UseSerialGC properly, so that can't be used in the check here. 2013 warning("Using the ParNew young collector with the Serial old collector is deprecated " 2014 "and will likely be removed in a future release"); 2015 } 2016 2017 if (CMSIncrementalMode) { 2018 warning("Using incremental CMS is deprecated and will likely be removed in a future release"); 2019 } 2020} 2021 2022void Arguments::check_deprecated_gc_flags() { 2023 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 2024 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 2025 "and will likely be removed in future release"); 2026 } 2027 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 2028 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 2029 "Use MaxRAMFraction instead."); 2030 } 2031 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) { 2032 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release."); 2033 } 2034 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) { 2035 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release."); 2036 } 2037 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) { 2038 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release."); 2039 } 2040} 2041 2042// Check stack pages settings 2043bool Arguments::check_stack_pages() 2044{ 2045 bool status = true; 2046 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 2047 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 2048 // greater stack shadow pages can't generate instruction to bang stack 2049 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 2050 return status; 2051} 2052 2053// Check the consistency of vm_init_args 2054bool Arguments::check_vm_args_consistency() { 2055 // Method for adding checks for flag consistency. 2056 // The intent is to warn the user of all possible conflicts, 2057 // before returning an error. 2058 // Note: Needs platform-dependent factoring. 2059 bool status = true; 2060 2061 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 2062 // builds so the cost of stack banging can be measured. 2063#if (defined(PRODUCT) && defined(SOLARIS)) 2064 if (!UseBoundThreads && !UseStackBanging) { 2065 jio_fprintf(defaultStream::error_stream(), 2066 "-UseStackBanging conflicts with -UseBoundThreads\n"); 2067 2068 status = false; 2069 } 2070#endif 2071 2072 if (TLABRefillWasteFraction == 0) { 2073 jio_fprintf(defaultStream::error_stream(), 2074 "TLABRefillWasteFraction should be a denominator, " 2075 "not " SIZE_FORMAT "\n", 2076 TLABRefillWasteFraction); 2077 status = false; 2078 } 2079 2080 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 2081 "AdaptiveSizePolicyWeight"); 2082 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 2083 2084 // Divide by bucket size to prevent a large size from causing rollover when 2085 // calculating amount of memory needed to be allocated for the String table. 2086 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2087 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2088 2089 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize, 2090 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size"); 2091 2092 { 2093 // Using "else if" below to avoid printing two error messages if min > max. 2094 // This will also prevent us from reporting both min>100 and max>100 at the 2095 // same time, but that is less annoying than printing two identical errors IMHO. 2096 FormatBuffer<80> err_msg(""); 2097 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) { 2098 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2099 status = false; 2100 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) { 2101 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2102 status = false; 2103 } 2104 } 2105 2106 // Min/MaxMetaspaceFreeRatio 2107 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2108 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2109 2110 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2111 jio_fprintf(defaultStream::error_stream(), 2112 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2113 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2114 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2115 MinMetaspaceFreeRatio, 2116 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2117 MaxMetaspaceFreeRatio); 2118 status = false; 2119 } 2120 2121 // Trying to keep 100% free is not practical 2122 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2123 2124 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2125 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2126 } 2127 2128 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2129 // Settings to encourage splitting. 2130 if (!FLAG_IS_CMDLINE(NewRatio)) { 2131 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2132 } 2133 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2134 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2135 } 2136 } 2137 2138 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2139 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2140 if (GCTimeLimit == 100) { 2141 // Turn off gc-overhead-limit-exceeded checks 2142 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2143 } 2144 2145 status = status && check_gc_consistency(); 2146 status = status && check_stack_pages(); 2147 2148 if (CMSIncrementalMode) { 2149 if (!UseConcMarkSweepGC) { 2150 jio_fprintf(defaultStream::error_stream(), 2151 "error: invalid argument combination.\n" 2152 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 2153 "selected in order\nto use CMSIncrementalMode.\n"); 2154 status = false; 2155 } else { 2156 status = status && verify_percentage(CMSIncrementalDutyCycle, 2157 "CMSIncrementalDutyCycle"); 2158 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 2159 "CMSIncrementalDutyCycleMin"); 2160 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2161 "CMSIncrementalSafetyFactor"); 2162 status = status && verify_percentage(CMSIncrementalOffset, 2163 "CMSIncrementalOffset"); 2164 status = status && verify_percentage(CMSExpAvgFactor, 2165 "CMSExpAvgFactor"); 2166 // If it was not set on the command line, set 2167 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 2168 if (CMSInitiatingOccupancyFraction < 0) { 2169 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 2170 } 2171 } 2172 } 2173 2174 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2175 // insists that we hold the requisite locks so that the iteration is 2176 // MT-safe. For the verification at start-up and shut-down, we don't 2177 // yet have a good way of acquiring and releasing these locks, 2178 // which are not visible at the CollectedHeap level. We want to 2179 // be able to acquire these locks and then do the iteration rather 2180 // than just disable the lock verification. This will be fixed under 2181 // bug 4788986. 2182 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2183 if (VerifyDuringStartup) { 2184 warning("Heap verification at start-up disabled " 2185 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2186 VerifyDuringStartup = false; // Disable verification at start-up 2187 } 2188 2189 if (VerifyBeforeExit) { 2190 warning("Heap verification at shutdown disabled " 2191 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2192 VerifyBeforeExit = false; // Disable verification at shutdown 2193 } 2194 } 2195 2196 // Note: only executed in non-PRODUCT mode 2197 if (!UseAsyncConcMarkSweepGC && 2198 (ExplicitGCInvokesConcurrent || 2199 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2200 jio_fprintf(defaultStream::error_stream(), 2201 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2202 " with -UseAsyncConcMarkSweepGC"); 2203 status = false; 2204 } 2205 2206 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2207 2208#if INCLUDE_ALL_GCS 2209 if (UseG1GC) { 2210 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent"); 2211 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent"); 2212 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent"); 2213 2214 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2215 "InitiatingHeapOccupancyPercent"); 2216 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2217 "G1RefProcDrainInterval"); 2218 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2219 "G1ConcMarkStepDurationMillis"); 2220 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2221 "G1ConcRSHotCardLimit"); 2222 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2223 "G1ConcRSLogCacheSize"); 2224 } 2225 if (UseConcMarkSweepGC) { 2226 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2227 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2228 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2229 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2230 2231 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2232 2233 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2234 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2235 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2236 2237 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2238 2239 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2240 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2241 2242 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2243 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2244 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2245 2246 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2247 2248 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2249 2250 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2251 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2252 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2253 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2254 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2255 } 2256 2257 if (UseParallelGC || UseParallelOldGC) { 2258 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2259 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2260 2261 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2262 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2263 2264 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2265 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2266 2267 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2268 2269 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2270 } 2271#endif // INCLUDE_ALL_GCS 2272 2273 status = status && verify_interval(RefDiscoveryPolicy, 2274 ReferenceProcessor::DiscoveryPolicyMin, 2275 ReferenceProcessor::DiscoveryPolicyMax, 2276 "RefDiscoveryPolicy"); 2277 2278 // Limit the lower bound of this flag to 1 as it is used in a division 2279 // expression. 2280 status = status && verify_interval(TLABWasteTargetPercent, 2281 1, 100, "TLABWasteTargetPercent"); 2282 2283 status = status && verify_object_alignment(); 2284 2285 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2286 "CompressedClassSpaceSize"); 2287 2288 status = status && verify_interval(MarkStackSizeMax, 2289 1, (max_jint - 1), "MarkStackSizeMax"); 2290 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2291 2292 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2293 2294 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2295 2296 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2297 2298 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2299 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2300 2301 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2302 2303 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2304 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2305 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2306 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2307 2308 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2309 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2310 2311 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2312 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2313 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2314 2315 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2316 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2317 2318 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp 2319 // just for that, so hardcode here. 2320 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold"); 2321 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold"); 2322 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2323 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2324 2325 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2326 2327 if (PrintNMTStatistics) { 2328#if INCLUDE_NMT 2329 if (MemTracker::tracking_level() == MemTracker::NMT_off) { 2330#endif // INCLUDE_NMT 2331 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2332 PrintNMTStatistics = false; 2333#if INCLUDE_NMT 2334 } 2335#endif 2336 } 2337 2338 // Need to limit the extent of the padding to reasonable size. 2339 // 8K is well beyond the reasonable HW cache line size, even with the 2340 // aggressive prefetching, while still leaving the room for segregating 2341 // among the distinct pages. 2342 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2343 jio_fprintf(defaultStream::error_stream(), 2344 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2345 ContendedPaddingWidth, 0, 8192); 2346 status = false; 2347 } 2348 2349 // Need to enforce the padding not to break the existing field alignments. 2350 // It is sufficient to check against the largest type size. 2351 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2352 jio_fprintf(defaultStream::error_stream(), 2353 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2354 ContendedPaddingWidth, BytesPerLong); 2355 status = false; 2356 } 2357 2358 // Check lower bounds of the code cache 2359 // Template Interpreter code is approximately 3X larger in debug builds. 2360 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace; 2361 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2362 jio_fprintf(defaultStream::error_stream(), 2363 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2364 os::vm_page_size()/K); 2365 status = false; 2366 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2367 jio_fprintf(defaultStream::error_stream(), 2368 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2369 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2370 status = false; 2371 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2372 jio_fprintf(defaultStream::error_stream(), 2373 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2374 min_code_cache_size/K); 2375 status = false; 2376 } else if (ReservedCodeCacheSize > 2*G) { 2377 // Code cache size larger than MAXINT is not supported. 2378 jio_fprintf(defaultStream::error_stream(), 2379 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2380 (2*G)/M); 2381 status = false; 2382 } 2383 2384 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction"); 2385 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); 2386 2387 return status; 2388} 2389 2390bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2391 const char* option_type) { 2392 if (ignore) return false; 2393 2394 const char* spacer = " "; 2395 if (option_type == NULL) { 2396 option_type = ++spacer; // Set both to the empty string. 2397 } 2398 2399 if (os::obsolete_option(option)) { 2400 jio_fprintf(defaultStream::error_stream(), 2401 "Obsolete %s%soption: %s\n", option_type, spacer, 2402 option->optionString); 2403 return false; 2404 } else { 2405 jio_fprintf(defaultStream::error_stream(), 2406 "Unrecognized %s%soption: %s\n", option_type, spacer, 2407 option->optionString); 2408 return true; 2409 } 2410} 2411 2412static const char* user_assertion_options[] = { 2413 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2414}; 2415 2416static const char* system_assertion_options[] = { 2417 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2418}; 2419 2420// Return true if any of the strings in null-terminated array 'names' matches. 2421// If tail_allowed is true, then the tail must begin with a colon; otherwise, 2422// the option must match exactly. 2423static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2424 bool tail_allowed) { 2425 for (/* empty */; *names != NULL; ++names) { 2426 if (match_option(option, *names, tail)) { 2427 if (**tail == '\0' || tail_allowed && **tail == ':') { 2428 return true; 2429 } 2430 } 2431 } 2432 return false; 2433} 2434 2435bool Arguments::parse_uintx(const char* value, 2436 uintx* uintx_arg, 2437 uintx min_size) { 2438 2439 // Check the sign first since atomull() parses only unsigned values. 2440 bool value_is_positive = !(*value == '-'); 2441 2442 if (value_is_positive) { 2443 julong n; 2444 bool good_return = atomull(value, &n); 2445 if (good_return) { 2446 bool above_minimum = n >= min_size; 2447 bool value_is_too_large = n > max_uintx; 2448 2449 if (above_minimum && !value_is_too_large) { 2450 *uintx_arg = n; 2451 return true; 2452 } 2453 } 2454 } 2455 return false; 2456} 2457 2458Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2459 julong* long_arg, 2460 julong min_size) { 2461 if (!atomull(s, long_arg)) return arg_unreadable; 2462 return check_memory_size(*long_arg, min_size); 2463} 2464 2465// Parse JavaVMInitArgs structure 2466 2467jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2468 // For components of the system classpath. 2469 SysClassPath scp(Arguments::get_sysclasspath()); 2470 bool scp_assembly_required = false; 2471 2472 // Save default settings for some mode flags 2473 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2474 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2475 Arguments::_ClipInlining = ClipInlining; 2476 Arguments::_BackgroundCompilation = BackgroundCompilation; 2477 2478 // Setup flags for mixed which is the default 2479 set_mode_flags(_mixed); 2480 2481 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2482 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2483 if (result != JNI_OK) { 2484 return result; 2485 } 2486 2487 // Parse JavaVMInitArgs structure passed in 2488 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE); 2489 if (result != JNI_OK) { 2490 return result; 2491 } 2492 2493 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2494 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2495 if (result != JNI_OK) { 2496 return result; 2497 } 2498 2499 // Do final processing now that all arguments have been parsed 2500 result = finalize_vm_init_args(&scp, scp_assembly_required); 2501 if (result != JNI_OK) { 2502 return result; 2503 } 2504 2505 return JNI_OK; 2506} 2507 2508// Checks if name in command-line argument -agent{lib,path}:name[=options] 2509// represents a valid HPROF of JDWP agent. is_path==true denotes that we 2510// are dealing with -agentpath (case where name is a path), otherwise with 2511// -agentlib 2512bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2513 char *_name; 2514 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2515 size_t _len_hprof, _len_jdwp, _len_prefix; 2516 2517 if (is_path) { 2518 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2519 return false; 2520 } 2521 2522 _name++; // skip past last path separator 2523 _len_prefix = strlen(JNI_LIB_PREFIX); 2524 2525 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2526 return false; 2527 } 2528 2529 _name += _len_prefix; 2530 _len_hprof = strlen(_hprof); 2531 _len_jdwp = strlen(_jdwp); 2532 2533 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2534 _name += _len_hprof; 2535 } 2536 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2537 _name += _len_jdwp; 2538 } 2539 else { 2540 return false; 2541 } 2542 2543 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2544 return false; 2545 } 2546 2547 return true; 2548 } 2549 2550 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2551 return true; 2552 } 2553 2554 return false; 2555} 2556 2557jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2558 SysClassPath* scp_p, 2559 bool* scp_assembly_required_p, 2560 Flag::Flags origin) { 2561 // Remaining part of option string 2562 const char* tail; 2563 2564 // iterate over arguments 2565 for (int index = 0; index < args->nOptions; index++) { 2566 bool is_absolute_path = false; // for -agentpath vs -agentlib 2567 2568 const JavaVMOption* option = args->options + index; 2569 2570 if (!match_option(option, "-Djava.class.path", &tail) && 2571 !match_option(option, "-Dsun.java.command", &tail) && 2572 !match_option(option, "-Dsun.java.launcher", &tail)) { 2573 2574 // add all jvm options to the jvm_args string. This string 2575 // is used later to set the java.vm.args PerfData string constant. 2576 // the -Djava.class.path and the -Dsun.java.command options are 2577 // omitted from jvm_args string as each have their own PerfData 2578 // string constant object. 2579 build_jvm_args(option->optionString); 2580 } 2581 2582 // -verbose:[class/gc/jni] 2583 if (match_option(option, "-verbose", &tail)) { 2584 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2585 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2586 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2587 } else if (!strcmp(tail, ":gc")) { 2588 FLAG_SET_CMDLINE(bool, PrintGC, true); 2589 } else if (!strcmp(tail, ":jni")) { 2590 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2591 } 2592 // -da / -ea / -disableassertions / -enableassertions 2593 // These accept an optional class/package name separated by a colon, e.g., 2594 // -da:java.lang.Thread. 2595 } else if (match_option(option, user_assertion_options, &tail, true)) { 2596 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2597 if (*tail == '\0') { 2598 JavaAssertions::setUserClassDefault(enable); 2599 } else { 2600 assert(*tail == ':', "bogus match by match_option()"); 2601 JavaAssertions::addOption(tail + 1, enable); 2602 } 2603 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2604 } else if (match_option(option, system_assertion_options, &tail, false)) { 2605 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2606 JavaAssertions::setSystemClassDefault(enable); 2607 // -bootclasspath: 2608 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2609 scp_p->reset_path(tail); 2610 *scp_assembly_required_p = true; 2611 // -bootclasspath/a: 2612 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2613 scp_p->add_suffix(tail); 2614 *scp_assembly_required_p = true; 2615 // -bootclasspath/p: 2616 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2617 scp_p->add_prefix(tail); 2618 *scp_assembly_required_p = true; 2619 // -Xrun 2620 } else if (match_option(option, "-Xrun", &tail)) { 2621 if (tail != NULL) { 2622 const char* pos = strchr(tail, ':'); 2623 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2624 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2625 name[len] = '\0'; 2626 2627 char *options = NULL; 2628 if(pos != NULL) { 2629 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2630 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2631 } 2632#if !INCLUDE_JVMTI 2633 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2634 jio_fprintf(defaultStream::error_stream(), 2635 "Profiling and debugging agents are not supported in this VM\n"); 2636 return JNI_ERR; 2637 } 2638#endif // !INCLUDE_JVMTI 2639 add_init_library(name, options); 2640 } 2641 // -agentlib and -agentpath 2642 } else if (match_option(option, "-agentlib:", &tail) || 2643 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2644 if(tail != NULL) { 2645 const char* pos = strchr(tail, '='); 2646 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2647 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2648 name[len] = '\0'; 2649 2650 char *options = NULL; 2651 if(pos != NULL) { 2652 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2653 } 2654#if !INCLUDE_JVMTI 2655 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2656 jio_fprintf(defaultStream::error_stream(), 2657 "Profiling and debugging agents are not supported in this VM\n"); 2658 return JNI_ERR; 2659 } 2660#endif // !INCLUDE_JVMTI 2661 add_init_agent(name, options, is_absolute_path); 2662 } 2663 // -javaagent 2664 } else if (match_option(option, "-javaagent:", &tail)) { 2665#if !INCLUDE_JVMTI 2666 jio_fprintf(defaultStream::error_stream(), 2667 "Instrumentation agents are not supported in this VM\n"); 2668 return JNI_ERR; 2669#else 2670 if(tail != NULL) { 2671 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2672 add_init_agent("instrument", options, false); 2673 } 2674#endif // !INCLUDE_JVMTI 2675 // -Xnoclassgc 2676 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2677 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2678 // -Xincgc: i-CMS 2679 } else if (match_option(option, "-Xincgc", &tail)) { 2680 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2681 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2682 // -Xnoincgc: no i-CMS 2683 } else if (match_option(option, "-Xnoincgc", &tail)) { 2684 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2685 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2686 // -Xconcgc 2687 } else if (match_option(option, "-Xconcgc", &tail)) { 2688 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2689 // -Xnoconcgc 2690 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2691 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2692 // -Xbatch 2693 } else if (match_option(option, "-Xbatch", &tail)) { 2694 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2695 // -Xmn for compatibility with other JVM vendors 2696 } else if (match_option(option, "-Xmn", &tail)) { 2697 julong long_initial_young_size = 0; 2698 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2699 if (errcode != arg_in_range) { 2700 jio_fprintf(defaultStream::error_stream(), 2701 "Invalid initial young generation size: %s\n", option->optionString); 2702 describe_range_error(errcode); 2703 return JNI_EINVAL; 2704 } 2705 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size); 2706 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size); 2707 // -Xms 2708 } else if (match_option(option, "-Xms", &tail)) { 2709 julong long_initial_heap_size = 0; 2710 // an initial heap size of 0 means automatically determine 2711 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2712 if (errcode != arg_in_range) { 2713 jio_fprintf(defaultStream::error_stream(), 2714 "Invalid initial heap size: %s\n", option->optionString); 2715 describe_range_error(errcode); 2716 return JNI_EINVAL; 2717 } 2718 set_min_heap_size((uintx)long_initial_heap_size); 2719 // Currently the minimum size and the initial heap sizes are the same. 2720 // Can be overridden with -XX:InitialHeapSize. 2721 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2722 // -Xmx 2723 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2724 julong long_max_heap_size = 0; 2725 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2726 if (errcode != arg_in_range) { 2727 jio_fprintf(defaultStream::error_stream(), 2728 "Invalid maximum heap size: %s\n", option->optionString); 2729 describe_range_error(errcode); 2730 return JNI_EINVAL; 2731 } 2732 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2733 // Xmaxf 2734 } else if (match_option(option, "-Xmaxf", &tail)) { 2735 char* err; 2736 int maxf = (int)(strtod(tail, &err) * 100); 2737 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) { 2738 jio_fprintf(defaultStream::error_stream(), 2739 "Bad max heap free percentage size: %s\n", 2740 option->optionString); 2741 return JNI_EINVAL; 2742 } else { 2743 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2744 } 2745 // Xminf 2746 } else if (match_option(option, "-Xminf", &tail)) { 2747 char* err; 2748 int minf = (int)(strtod(tail, &err) * 100); 2749 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) { 2750 jio_fprintf(defaultStream::error_stream(), 2751 "Bad min heap free percentage size: %s\n", 2752 option->optionString); 2753 return JNI_EINVAL; 2754 } else { 2755 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2756 } 2757 // -Xss 2758 } else if (match_option(option, "-Xss", &tail)) { 2759 julong long_ThreadStackSize = 0; 2760 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2761 if (errcode != arg_in_range) { 2762 jio_fprintf(defaultStream::error_stream(), 2763 "Invalid thread stack size: %s\n", option->optionString); 2764 describe_range_error(errcode); 2765 return JNI_EINVAL; 2766 } 2767 // Internally track ThreadStackSize in units of 1024 bytes. 2768 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2769 round_to((int)long_ThreadStackSize, K) / K); 2770 // -Xoss 2771 } else if (match_option(option, "-Xoss", &tail)) { 2772 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2773 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2774 julong long_CodeCacheExpansionSize = 0; 2775 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2776 if (errcode != arg_in_range) { 2777 jio_fprintf(defaultStream::error_stream(), 2778 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2779 os::vm_page_size()/K); 2780 return JNI_EINVAL; 2781 } 2782 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2783 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2784 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2785 julong long_ReservedCodeCacheSize = 0; 2786 2787 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2788 if (errcode != arg_in_range) { 2789 jio_fprintf(defaultStream::error_stream(), 2790 "Invalid maximum code cache size: %s.\n", option->optionString); 2791 return JNI_EINVAL; 2792 } 2793 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2794 //-XX:IncreaseFirstTierCompileThresholdAt= 2795 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2796 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2797 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2798 jio_fprintf(defaultStream::error_stream(), 2799 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2800 option->optionString); 2801 return JNI_EINVAL; 2802 } 2803 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2804 // -green 2805 } else if (match_option(option, "-green", &tail)) { 2806 jio_fprintf(defaultStream::error_stream(), 2807 "Green threads support not available\n"); 2808 return JNI_EINVAL; 2809 // -native 2810 } else if (match_option(option, "-native", &tail)) { 2811 // HotSpot always uses native threads, ignore silently for compatibility 2812 // -Xsqnopause 2813 } else if (match_option(option, "-Xsqnopause", &tail)) { 2814 // EVM option, ignore silently for compatibility 2815 // -Xrs 2816 } else if (match_option(option, "-Xrs", &tail)) { 2817 // Classic/EVM option, new functionality 2818 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2819 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2820 // change default internal VM signals used - lower case for back compat 2821 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2822 // -Xoptimize 2823 } else if (match_option(option, "-Xoptimize", &tail)) { 2824 // EVM option, ignore silently for compatibility 2825 // -Xprof 2826 } else if (match_option(option, "-Xprof", &tail)) { 2827#if INCLUDE_FPROF 2828 _has_profile = true; 2829#else // INCLUDE_FPROF 2830 jio_fprintf(defaultStream::error_stream(), 2831 "Flat profiling is not supported in this VM.\n"); 2832 return JNI_ERR; 2833#endif // INCLUDE_FPROF 2834 // -Xconcurrentio 2835 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2836 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2837 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2838 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2839 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2840 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2841 2842 // -Xinternalversion 2843 } else if (match_option(option, "-Xinternalversion", &tail)) { 2844 jio_fprintf(defaultStream::output_stream(), "%s\n", 2845 VM_Version::internal_vm_info_string()); 2846 vm_exit(0); 2847#ifndef PRODUCT 2848 // -Xprintflags 2849 } else if (match_option(option, "-Xprintflags", &tail)) { 2850 CommandLineFlags::printFlags(tty, false); 2851 vm_exit(0); 2852#endif 2853 // -D 2854 } else if (match_option(option, "-D", &tail)) { 2855 if (!add_property(tail)) { 2856 return JNI_ENOMEM; 2857 } 2858 // Out of the box management support 2859 if (match_option(option, "-Dcom.sun.management", &tail)) { 2860#if INCLUDE_MANAGEMENT 2861 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2862#else 2863 jio_fprintf(defaultStream::output_stream(), 2864 "-Dcom.sun.management is not supported in this VM.\n"); 2865 return JNI_ERR; 2866#endif 2867 } 2868 // -Xint 2869 } else if (match_option(option, "-Xint", &tail)) { 2870 set_mode_flags(_int); 2871 // -Xmixed 2872 } else if (match_option(option, "-Xmixed", &tail)) { 2873 set_mode_flags(_mixed); 2874 // -Xcomp 2875 } else if (match_option(option, "-Xcomp", &tail)) { 2876 // for testing the compiler; turn off all flags that inhibit compilation 2877 set_mode_flags(_comp); 2878 // -Xshare:dump 2879 } else if (match_option(option, "-Xshare:dump", &tail)) { 2880 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2881 set_mode_flags(_int); // Prevent compilation, which creates objects 2882 // -Xshare:on 2883 } else if (match_option(option, "-Xshare:on", &tail)) { 2884 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2885 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2886 // -Xshare:auto 2887 } else if (match_option(option, "-Xshare:auto", &tail)) { 2888 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2889 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2890 // -Xshare:off 2891 } else if (match_option(option, "-Xshare:off", &tail)) { 2892 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2893 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2894 // -Xverify 2895 } else if (match_option(option, "-Xverify", &tail)) { 2896 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2897 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2898 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2899 } else if (strcmp(tail, ":remote") == 0) { 2900 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2901 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2902 } else if (strcmp(tail, ":none") == 0) { 2903 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2904 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2905 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2906 return JNI_EINVAL; 2907 } 2908 // -Xdebug 2909 } else if (match_option(option, "-Xdebug", &tail)) { 2910 // note this flag has been used, then ignore 2911 set_xdebug_mode(true); 2912 // -Xnoagent 2913 } else if (match_option(option, "-Xnoagent", &tail)) { 2914 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2915 } else if (match_option(option, "-Xboundthreads", &tail)) { 2916 // Bind user level threads to kernel threads (Solaris only) 2917 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2918 } else if (match_option(option, "-Xloggc:", &tail)) { 2919 // Redirect GC output to the file. -Xloggc:<filename> 2920 // ostream_init_log(), when called will use this filename 2921 // to initialize a fileStream. 2922 _gc_log_filename = strdup(tail); 2923 if (!is_filename_valid(_gc_log_filename)) { 2924 jio_fprintf(defaultStream::output_stream(), 2925 "Invalid file name for use with -Xloggc: Filename can only contain the " 2926 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 2927 "Note %%p or %%t can only be used once\n", _gc_log_filename); 2928 return JNI_EINVAL; 2929 } 2930 FLAG_SET_CMDLINE(bool, PrintGC, true); 2931 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2932 2933 // JNI hooks 2934 } else if (match_option(option, "-Xcheck", &tail)) { 2935 if (!strcmp(tail, ":jni")) { 2936#if !INCLUDE_JNI_CHECK 2937 warning("JNI CHECKING is not supported in this VM"); 2938#else 2939 CheckJNICalls = true; 2940#endif // INCLUDE_JNI_CHECK 2941 } else if (is_bad_option(option, args->ignoreUnrecognized, 2942 "check")) { 2943 return JNI_EINVAL; 2944 } 2945 } else if (match_option(option, "vfprintf", &tail)) { 2946 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2947 } else if (match_option(option, "exit", &tail)) { 2948 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2949 } else if (match_option(option, "abort", &tail)) { 2950 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2951 // -XX:+AggressiveHeap 2952 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2953 2954 // This option inspects the machine and attempts to set various 2955 // parameters to be optimal for long-running, memory allocation 2956 // intensive jobs. It is intended for machines with large 2957 // amounts of cpu and memory. 2958 2959 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2960 // VM, but we may not be able to represent the total physical memory 2961 // available (like having 8gb of memory on a box but using a 32bit VM). 2962 // Thus, we need to make sure we're using a julong for intermediate 2963 // calculations. 2964 julong initHeapSize; 2965 julong total_memory = os::physical_memory(); 2966 2967 if (total_memory < (julong)256*M) { 2968 jio_fprintf(defaultStream::error_stream(), 2969 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2970 vm_exit(1); 2971 } 2972 2973 // The heap size is half of available memory, or (at most) 2974 // all of possible memory less 160mb (leaving room for the OS 2975 // when using ISM). This is the maximum; because adaptive sizing 2976 // is turned on below, the actual space used may be smaller. 2977 2978 initHeapSize = MIN2(total_memory / (julong)2, 2979 total_memory - (julong)160*M); 2980 2981 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2982 2983 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2984 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2985 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2986 // Currently the minimum size and the initial heap sizes are the same. 2987 set_min_heap_size(initHeapSize); 2988 } 2989 if (FLAG_IS_DEFAULT(NewSize)) { 2990 // Make the young generation 3/8ths of the total heap. 2991 FLAG_SET_CMDLINE(uintx, NewSize, 2992 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2993 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2994 } 2995 2996#ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 2997 FLAG_SET_DEFAULT(UseLargePages, true); 2998#endif 2999 3000 // Increase some data structure sizes for efficiency 3001 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 3002 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3003 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 3004 3005 // See the OldPLABSize comment below, but replace 'after promotion' 3006 // with 'after copying'. YoungPLABSize is the size of the survivor 3007 // space per-gc-thread buffers. The default is 4kw. 3008 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 3009 3010 // OldPLABSize is the size of the buffers in the old gen that 3011 // UseParallelGC uses to promote live data that doesn't fit in the 3012 // survivor spaces. At any given time, there's one for each gc thread. 3013 // The default size is 1kw. These buffers are rarely used, since the 3014 // survivor spaces are usually big enough. For specjbb, however, there 3015 // are occasions when there's lots of live data in the young gen 3016 // and we end up promoting some of it. We don't have a definite 3017 // explanation for why bumping OldPLABSize helps, but the theory 3018 // is that a bigger PLAB results in retaining something like the 3019 // original allocation order after promotion, which improves mutator 3020 // locality. A minor effect may be that larger PLABs reduce the 3021 // number of PLAB allocation events during gc. The value of 8kw 3022 // was arrived at by experimenting with specjbb. 3023 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 3024 3025 // Enable parallel GC and adaptive generation sizing 3026 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 3027 FLAG_SET_DEFAULT(ParallelGCThreads, 3028 Abstract_VM_Version::parallel_worker_threads()); 3029 3030 // Encourage steady state memory management 3031 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 3032 3033 // This appears to improve mutator locality 3034 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3035 3036 // Get around early Solaris scheduling bug 3037 // (affinity vs other jobs on system) 3038 // but disallow DR and offlining (5008695). 3039 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 3040 3041 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 3042 // The last option must always win. 3043 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3044 FLAG_SET_CMDLINE(bool, NeverTenure, true); 3045 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 3046 // The last option must always win. 3047 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3048 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3049 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 3050 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 3051 jio_fprintf(defaultStream::error_stream(), 3052 "Please use CMSClassUnloadingEnabled in place of " 3053 "CMSPermGenSweepingEnabled in the future\n"); 3054 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 3055 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 3056 jio_fprintf(defaultStream::error_stream(), 3057 "Please use -XX:+UseGCOverheadLimit in place of " 3058 "-XX:+UseGCTimeLimit in the future\n"); 3059 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 3060 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 3061 jio_fprintf(defaultStream::error_stream(), 3062 "Please use -XX:-UseGCOverheadLimit in place of " 3063 "-XX:-UseGCTimeLimit in the future\n"); 3064 // The TLE options are for compatibility with 1.3 and will be 3065 // removed without notice in a future release. These options 3066 // are not to be documented. 3067 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 3068 // No longer used. 3069 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 3070 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 3071 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 3072 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3073 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 3074 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 3075 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 3076 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 3077 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 3078 // No longer used. 3079 } else if (match_option(option, "-XX:TLESize=", &tail)) { 3080 julong long_tlab_size = 0; 3081 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 3082 if (errcode != arg_in_range) { 3083 jio_fprintf(defaultStream::error_stream(), 3084 "Invalid TLAB size: %s\n", option->optionString); 3085 describe_range_error(errcode); 3086 return JNI_EINVAL; 3087 } 3088 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 3089 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 3090 // No longer used. 3091 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 3092 FLAG_SET_CMDLINE(bool, UseTLAB, true); 3093 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 3094 FLAG_SET_CMDLINE(bool, UseTLAB, false); 3095 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 3096 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3097 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3098 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 3099 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3100 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3101 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 3102#if defined(DTRACE_ENABLED) 3103 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3104 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3105 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3106 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3107#else // defined(DTRACE_ENABLED) 3108 jio_fprintf(defaultStream::error_stream(), 3109 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3110 return JNI_EINVAL; 3111#endif // defined(DTRACE_ENABLED) 3112#ifdef ASSERT 3113 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 3114 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3115 // disable scavenge before parallel mark-compact 3116 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3117#endif 3118 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 3119 julong cms_blocks_to_claim = (julong)atol(tail); 3120 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3121 jio_fprintf(defaultStream::error_stream(), 3122 "Please use -XX:OldPLABSize in place of " 3123 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 3124 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 3125 julong cms_blocks_to_claim = (julong)atol(tail); 3126 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3127 jio_fprintf(defaultStream::error_stream(), 3128 "Please use -XX:OldPLABSize in place of " 3129 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 3130 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 3131 julong old_plab_size = 0; 3132 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 3133 if (errcode != arg_in_range) { 3134 jio_fprintf(defaultStream::error_stream(), 3135 "Invalid old PLAB size: %s\n", option->optionString); 3136 describe_range_error(errcode); 3137 return JNI_EINVAL; 3138 } 3139 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 3140 jio_fprintf(defaultStream::error_stream(), 3141 "Please use -XX:OldPLABSize in place of " 3142 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 3143 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 3144 julong young_plab_size = 0; 3145 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 3146 if (errcode != arg_in_range) { 3147 jio_fprintf(defaultStream::error_stream(), 3148 "Invalid young PLAB size: %s\n", option->optionString); 3149 describe_range_error(errcode); 3150 return JNI_EINVAL; 3151 } 3152 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 3153 jio_fprintf(defaultStream::error_stream(), 3154 "Please use -XX:YoungPLABSize in place of " 3155 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 3156 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3157 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3158 julong stack_size = 0; 3159 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3160 if (errcode != arg_in_range) { 3161 jio_fprintf(defaultStream::error_stream(), 3162 "Invalid mark stack size: %s\n", option->optionString); 3163 describe_range_error(errcode); 3164 return JNI_EINVAL; 3165 } 3166 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3167 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3168 julong max_stack_size = 0; 3169 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3170 if (errcode != arg_in_range) { 3171 jio_fprintf(defaultStream::error_stream(), 3172 "Invalid maximum mark stack size: %s\n", 3173 option->optionString); 3174 describe_range_error(errcode); 3175 return JNI_EINVAL; 3176 } 3177 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3178 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3179 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3180 uintx conc_threads = 0; 3181 if (!parse_uintx(tail, &conc_threads, 1)) { 3182 jio_fprintf(defaultStream::error_stream(), 3183 "Invalid concurrent threads: %s\n", option->optionString); 3184 return JNI_EINVAL; 3185 } 3186 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3187 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3188 julong max_direct_memory_size = 0; 3189 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3190 if (errcode != arg_in_range) { 3191 jio_fprintf(defaultStream::error_stream(), 3192 "Invalid maximum direct memory size: %s\n", 3193 option->optionString); 3194 describe_range_error(errcode); 3195 return JNI_EINVAL; 3196 } 3197 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3198 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) { 3199 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go 3200 // away and will cause VM initialization failures! 3201 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release."); 3202 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true); 3203#if !INCLUDE_MANAGEMENT 3204 } else if (match_option(option, "-XX:+ManagementServer", &tail)) { 3205 jio_fprintf(defaultStream::error_stream(), 3206 "ManagementServer is not supported in this VM.\n"); 3207 return JNI_ERR; 3208#endif // INCLUDE_MANAGEMENT 3209 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3210 // Skip -XX:Flags= since that case has already been handled 3211 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3212 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3213 return JNI_EINVAL; 3214 } 3215 } 3216 // Unknown option 3217 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3218 return JNI_ERR; 3219 } 3220 } 3221 3222 // Change the default value for flags which have different default values 3223 // when working with older JDKs. 3224#ifdef LINUX 3225 if (JDK_Version::current().compare_major(6) <= 0 && 3226 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3227 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3228 } 3229#endif // LINUX 3230 return JNI_OK; 3231} 3232 3233jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3234 // This must be done after all -D arguments have been processed. 3235 scp_p->expand_endorsed(); 3236 3237 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 3238 // Assemble the bootclasspath elements into the final path. 3239 Arguments::set_sysclasspath(scp_p->combined_path()); 3240 } 3241 3242 // This must be done after all arguments have been processed. 3243 // java_compiler() true means set to "NONE" or empty. 3244 if (java_compiler() && !xdebug_mode()) { 3245 // For backwards compatibility, we switch to interpreted mode if 3246 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3247 // not specified. 3248 set_mode_flags(_int); 3249 } 3250 if (CompileThreshold == 0) { 3251 set_mode_flags(_int); 3252 } 3253 3254 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3255 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3256 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3257 } 3258 3259#ifndef COMPILER2 3260 // Don't degrade server performance for footprint 3261 if (FLAG_IS_DEFAULT(UseLargePages) && 3262 MaxHeapSize < LargePageHeapSizeThreshold) { 3263 // No need for large granularity pages w/small heaps. 3264 // Note that large pages are enabled/disabled for both the 3265 // Java heap and the code cache. 3266 FLAG_SET_DEFAULT(UseLargePages, false); 3267 } 3268 3269#else 3270 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3271 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3272 } 3273#endif 3274 3275#ifndef TIERED 3276 // Tiered compilation is undefined. 3277 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3278#endif 3279 3280 // If we are running in a headless jre, force java.awt.headless property 3281 // to be true unless the property has already been set. 3282 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3283 if (os::is_headless_jre()) { 3284 const char* headless = Arguments::get_property("java.awt.headless"); 3285 if (headless == NULL) { 3286 char envbuffer[128]; 3287 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3288 if (!add_property("java.awt.headless=true")) { 3289 return JNI_ENOMEM; 3290 } 3291 } else { 3292 char buffer[256]; 3293 strcpy(buffer, "java.awt.headless="); 3294 strcat(buffer, envbuffer); 3295 if (!add_property(buffer)) { 3296 return JNI_ENOMEM; 3297 } 3298 } 3299 } 3300 } 3301 3302 if (!check_vm_args_consistency()) { 3303 return JNI_ERR; 3304 } 3305 3306 return JNI_OK; 3307} 3308 3309jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3310 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3311 scp_assembly_required_p); 3312} 3313 3314jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3315 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3316 scp_assembly_required_p); 3317} 3318 3319jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3320 const int N_MAX_OPTIONS = 64; 3321 const int OPTION_BUFFER_SIZE = 1024; 3322 char buffer[OPTION_BUFFER_SIZE]; 3323 3324 // The variable will be ignored if it exceeds the length of the buffer. 3325 // Don't check this variable if user has special privileges 3326 // (e.g. unix su command). 3327 if (os::getenv(name, buffer, sizeof(buffer)) && 3328 !os::have_special_privileges()) { 3329 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3330 jio_fprintf(defaultStream::error_stream(), 3331 "Picked up %s: %s\n", name, buffer); 3332 char* rd = buffer; // pointer to the input string (rd) 3333 int i; 3334 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3335 while (isspace(*rd)) rd++; // skip whitespace 3336 if (*rd == 0) break; // we re done when the input string is read completely 3337 3338 // The output, option string, overwrites the input string. 3339 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3340 // input string (rd). 3341 char* wrt = rd; 3342 3343 options[i++].optionString = wrt; // Fill in option 3344 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3345 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3346 int quote = *rd; // matching quote to look for 3347 rd++; // don't copy open quote 3348 while (*rd != quote) { // include everything (even spaces) up until quote 3349 if (*rd == 0) { // string termination means unmatched string 3350 jio_fprintf(defaultStream::error_stream(), 3351 "Unmatched quote in %s\n", name); 3352 return JNI_ERR; 3353 } 3354 *wrt++ = *rd++; // copy to option string 3355 } 3356 rd++; // don't copy close quote 3357 } else { 3358 *wrt++ = *rd++; // copy to option string 3359 } 3360 } 3361 // Need to check if we're done before writing a NULL, 3362 // because the write could be to the byte that rd is pointing to. 3363 if (*rd++ == 0) { 3364 *wrt = 0; 3365 break; 3366 } 3367 *wrt = 0; // Zero terminate option 3368 } 3369 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3370 JavaVMInitArgs vm_args; 3371 vm_args.version = JNI_VERSION_1_2; 3372 vm_args.options = options; 3373 vm_args.nOptions = i; 3374 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3375 3376 if (PrintVMOptions) { 3377 const char* tail; 3378 for (int i = 0; i < vm_args.nOptions; i++) { 3379 const JavaVMOption *option = vm_args.options + i; 3380 if (match_option(option, "-XX:", &tail)) { 3381 logOption(tail); 3382 } 3383 } 3384 } 3385 3386 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR)); 3387 } 3388 return JNI_OK; 3389} 3390 3391void Arguments::set_shared_spaces_flags() { 3392 if (DumpSharedSpaces) { 3393 if (RequireSharedSpaces) { 3394 warning("cannot dump shared archive while using shared archive"); 3395 } 3396 UseSharedSpaces = false; 3397#ifdef _LP64 3398 if (!UseCompressedOops || !UseCompressedClassPointers) { 3399 vm_exit_during_initialization( 3400 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3401 } 3402 } else { 3403 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces. 3404 if (!UseCompressedOops || !UseCompressedClassPointers) { 3405 no_shared_spaces(); 3406 } 3407#endif 3408 } 3409} 3410 3411#if !INCLUDE_ALL_GCS 3412static void force_serial_gc() { 3413 FLAG_SET_DEFAULT(UseSerialGC, true); 3414 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 3415 UNSUPPORTED_GC_OPTION(UseG1GC); 3416 UNSUPPORTED_GC_OPTION(UseParallelGC); 3417 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3418 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3419 UNSUPPORTED_GC_OPTION(UseParNewGC); 3420} 3421#endif // INCLUDE_ALL_GCS 3422 3423// Sharing support 3424// Construct the path to the archive 3425static char* get_shared_archive_path() { 3426 char *shared_archive_path; 3427 if (SharedArchiveFile == NULL) { 3428 char jvm_path[JVM_MAXPATHLEN]; 3429 os::jvm_path(jvm_path, sizeof(jvm_path)); 3430 char *end = strrchr(jvm_path, *os::file_separator()); 3431 if (end != NULL) *end = '\0'; 3432 size_t jvm_path_len = strlen(jvm_path); 3433 size_t file_sep_len = strlen(os::file_separator()); 3434 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3435 file_sep_len + 20, mtInternal); 3436 if (shared_archive_path != NULL) { 3437 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3438 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3439 strncat(shared_archive_path, "classes.jsa", 11); 3440 } 3441 } else { 3442 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3443 if (shared_archive_path != NULL) { 3444 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3445 } 3446 } 3447 return shared_archive_path; 3448} 3449 3450#ifndef PRODUCT 3451// Determine whether LogVMOutput should be implicitly turned on. 3452static bool use_vm_log() { 3453 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3454 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3455 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3456 PrintAssembly || TraceDeoptimization || TraceDependencies || 3457 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3458 return true; 3459 } 3460 3461#ifdef COMPILER1 3462 if (PrintC1Statistics) { 3463 return true; 3464 } 3465#endif // COMPILER1 3466 3467#ifdef COMPILER2 3468 if (PrintOptoAssembly || PrintOptoStatistics) { 3469 return true; 3470 } 3471#endif // COMPILER2 3472 3473 return false; 3474} 3475#endif // PRODUCT 3476 3477// Parse entry point called from JNI_CreateJavaVM 3478 3479jint Arguments::parse(const JavaVMInitArgs* args) { 3480 3481 // Remaining part of option string 3482 const char* tail; 3483 3484 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3485 const char* hotspotrc = ".hotspotrc"; 3486 bool settings_file_specified = false; 3487 bool needs_hotspotrc_warning = false; 3488 3489 const char* flags_file; 3490 int index; 3491 for (index = 0; index < args->nOptions; index++) { 3492 const JavaVMOption *option = args->options + index; 3493 if (match_option(option, "-XX:Flags=", &tail)) { 3494 flags_file = tail; 3495 settings_file_specified = true; 3496 } 3497 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3498 PrintVMOptions = true; 3499 } 3500 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3501 PrintVMOptions = false; 3502 } 3503 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3504 IgnoreUnrecognizedVMOptions = true; 3505 } 3506 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3507 IgnoreUnrecognizedVMOptions = false; 3508 } 3509 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3510 CommandLineFlags::printFlags(tty, false); 3511 vm_exit(0); 3512 } 3513 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3514#if INCLUDE_NMT 3515 MemTracker::init_tracking_options(tail); 3516#else 3517 jio_fprintf(defaultStream::error_stream(), 3518 "Native Memory Tracking is not supported in this VM\n"); 3519 return JNI_ERR; 3520#endif 3521 } 3522 3523 3524#ifndef PRODUCT 3525 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3526 CommandLineFlags::printFlags(tty, true); 3527 vm_exit(0); 3528 } 3529#endif 3530 } 3531 3532 if (IgnoreUnrecognizedVMOptions) { 3533 // uncast const to modify the flag args->ignoreUnrecognized 3534 *(jboolean*)(&args->ignoreUnrecognized) = true; 3535 } 3536 3537 // Parse specified settings file 3538 if (settings_file_specified) { 3539 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3540 return JNI_EINVAL; 3541 } 3542 } else { 3543#ifdef ASSERT 3544 // Parse default .hotspotrc settings file 3545 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3546 return JNI_EINVAL; 3547 } 3548#else 3549 struct stat buf; 3550 if (os::stat(hotspotrc, &buf) == 0) { 3551 needs_hotspotrc_warning = true; 3552 } 3553#endif 3554 } 3555 3556 if (PrintVMOptions) { 3557 for (index = 0; index < args->nOptions; index++) { 3558 const JavaVMOption *option = args->options + index; 3559 if (match_option(option, "-XX:", &tail)) { 3560 logOption(tail); 3561 } 3562 } 3563 } 3564 3565 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3566 jint result = parse_vm_init_args(args); 3567 if (result != JNI_OK) { 3568 return result; 3569 } 3570 3571 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3572 SharedArchivePath = get_shared_archive_path(); 3573 if (SharedArchivePath == NULL) { 3574 return JNI_ENOMEM; 3575 } 3576 3577 // Delay warning until here so that we've had a chance to process 3578 // the -XX:-PrintWarnings flag 3579 if (needs_hotspotrc_warning) { 3580 warning("%s file is present but has been ignored. " 3581 "Run with -XX:Flags=%s to load the file.", 3582 hotspotrc, hotspotrc); 3583 } 3584 3585#ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3586 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3587#endif 3588 3589#if INCLUDE_ALL_GCS 3590 #if (defined JAVASE_EMBEDDED || defined ARM) 3591 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3592 #endif 3593#endif 3594 3595#ifndef PRODUCT 3596 if (TraceBytecodesAt != 0) { 3597 TraceBytecodes = true; 3598 } 3599 if (CountCompiledCalls) { 3600 if (UseCounterDecay) { 3601 warning("UseCounterDecay disabled because CountCalls is set"); 3602 UseCounterDecay = false; 3603 } 3604 } 3605#endif // PRODUCT 3606 3607 // JSR 292 is not supported before 1.7 3608 if (!JDK_Version::is_gte_jdk17x_version()) { 3609 if (EnableInvokeDynamic) { 3610 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3611 warning("JSR 292 is not supported before 1.7. Disabling support."); 3612 } 3613 EnableInvokeDynamic = false; 3614 } 3615 } 3616 3617 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 3618 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3619 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 3620 } 3621 ScavengeRootsInCode = 1; 3622 } 3623 3624 if (PrintGCDetails) { 3625 // Turn on -verbose:gc options as well 3626 PrintGC = true; 3627 } 3628 3629 if (!JDK_Version::is_gte_jdk18x_version()) { 3630 // To avoid changing the log format for 7 updates this flag is only 3631 // true by default in JDK8 and above. 3632 if (FLAG_IS_DEFAULT(PrintGCCause)) { 3633 FLAG_SET_DEFAULT(PrintGCCause, false); 3634 } 3635 } 3636 3637 // Set object alignment values. 3638 set_object_alignment(); 3639 3640#if !INCLUDE_ALL_GCS 3641 force_serial_gc(); 3642#endif // INCLUDE_ALL_GCS 3643#if !INCLUDE_CDS 3644 if (DumpSharedSpaces || RequireSharedSpaces) { 3645 jio_fprintf(defaultStream::error_stream(), 3646 "Shared spaces are not supported in this VM\n"); 3647 return JNI_ERR; 3648 } 3649 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3650 warning("Shared spaces are not supported in this VM"); 3651 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3652 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3653 } 3654 no_shared_spaces(); 3655#endif // INCLUDE_CDS 3656 3657 return JNI_OK; 3658} 3659 3660jint Arguments::apply_ergo() { 3661 3662 // Set flags based on ergonomics. 3663 set_ergonomics_flags(); 3664 3665 set_shared_spaces_flags(); 3666 3667 // Check the GC selections again. 3668 if (!check_gc_consistency()) { 3669 return JNI_EINVAL; 3670 } 3671 3672 if (TieredCompilation) { 3673 set_tiered_flags(); 3674 } else { 3675 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3676 if (CompilationPolicyChoice >= 2) { 3677 vm_exit_during_initialization( 3678 "Incompatible compilation policy selected", NULL); 3679 } 3680 } 3681 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered) 3682 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3683 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M)); 3684 } 3685 3686 3687 // Set heap size based on available physical memory 3688 set_heap_size(); 3689 3690#if INCLUDE_ALL_GCS 3691 // Set per-collector flags 3692 if (UseParallelGC || UseParallelOldGC) { 3693 set_parallel_gc_flags(); 3694 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below 3695 set_cms_and_parnew_gc_flags(); 3696 } else if (UseParNewGC) { // Skipped if CMS is set above 3697 set_parnew_gc_flags(); 3698 } else if (UseG1GC) { 3699 set_g1_gc_flags(); 3700 } 3701 check_deprecated_gcs(); 3702 check_deprecated_gc_flags(); 3703 if (AssumeMP && !UseSerialGC) { 3704 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 3705 warning("If the number of processors is expected to increase from one, then" 3706 " you should configure the number of parallel GC threads appropriately" 3707 " using -XX:ParallelGCThreads=N"); 3708 } 3709 } 3710 if (MinHeapFreeRatio == 100) { 3711 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 3712 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 3713 } 3714#else // INCLUDE_ALL_GCS 3715 assert(verify_serial_gc_flags(), "SerialGC unset"); 3716#endif // INCLUDE_ALL_GCS 3717 3718 // Initialize Metaspace flags and alignments 3719 Metaspace::ergo_initialize(); 3720 3721 // Set bytecode rewriting flags 3722 set_bytecode_flags(); 3723 3724 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 3725 set_aggressive_opts_flags(); 3726 3727 // Turn off biased locking for locking debug mode flags, 3728 // which are subtly different from each other but neither works with 3729 // biased locking 3730 if (UseHeavyMonitors 3731#ifdef COMPILER1 3732 || !UseFastLocking 3733#endif // COMPILER1 3734 ) { 3735 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3736 // flag set to true on command line; warn the user that they 3737 // can't enable biased locking here 3738 warning("Biased Locking is not supported with locking debug flags" 3739 "; ignoring UseBiasedLocking flag." ); 3740 } 3741 UseBiasedLocking = false; 3742 } 3743 3744#ifdef CC_INTERP 3745 // Clear flags not supported by the C++ interpreter 3746 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3747 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3748 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3749 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3750#endif // CC_INTERP 3751 3752#ifdef COMPILER2 3753 if (!UseBiasedLocking || EmitSync != 0) { 3754 UseOptoBiasInlining = false; 3755 } 3756 if (!EliminateLocks) { 3757 EliminateNestedLocks = false; 3758 } 3759 if (!Inline) { 3760 IncrementalInline = false; 3761 } 3762#ifndef PRODUCT 3763 if (!IncrementalInline) { 3764 AlwaysIncrementalInline = false; 3765 } 3766#endif 3767 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) { 3768 // incremental inlining: bump MaxNodeLimit 3769 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000); 3770 } 3771 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 3772 // nothing to use the profiling, turn if off 3773 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 3774 } 3775 if (UseTypeSpeculation && FLAG_IS_DEFAULT(ReplaceInParentMaps)) { 3776 // Doing the replace in parent maps helps speculation 3777 FLAG_SET_DEFAULT(ReplaceInParentMaps, true); 3778 } 3779#endif 3780 3781 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3782 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3783 DebugNonSafepoints = true; 3784 } 3785 3786 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3787 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3788 } 3789 3790#ifndef PRODUCT 3791 if (CompileTheWorld) { 3792 // Force NmethodSweeper to sweep whole CodeCache each time. 3793 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3794 NmethodSweepFraction = 1; 3795 } 3796 } 3797 3798 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3799 if (use_vm_log()) { 3800 LogVMOutput = true; 3801 } 3802 } 3803#endif // PRODUCT 3804 3805 if (PrintCommandLineFlags) { 3806 CommandLineFlags::printSetFlags(tty); 3807 } 3808 3809 // Apply CPU specific policy for the BiasedLocking 3810 if (UseBiasedLocking) { 3811 if (!VM_Version::use_biased_locking() && 3812 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3813 UseBiasedLocking = false; 3814 } 3815 } 3816 3817 return JNI_OK; 3818} 3819 3820jint Arguments::adjust_after_os() { 3821 if (UseNUMA) { 3822 if (UseParallelGC || UseParallelOldGC) { 3823 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3824 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3825 } 3826 } 3827 // UseNUMAInterleaving is set to ON for all collectors and 3828 // platforms when UseNUMA is set to ON. NUMA-aware collectors 3829 // such as the parallel collector for Linux and Solaris will 3830 // interleave old gen and survivor spaces on top of NUMA 3831 // allocation policy for the eden space. 3832 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 3833 // all platforms and ParallelGC on Windows will interleave all 3834 // of the heap spaces across NUMA nodes. 3835 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 3836 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 3837 } 3838 } 3839 return JNI_OK; 3840} 3841 3842int Arguments::PropertyList_count(SystemProperty* pl) { 3843 int count = 0; 3844 while(pl != NULL) { 3845 count++; 3846 pl = pl->next(); 3847 } 3848 return count; 3849} 3850 3851const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3852 assert(key != NULL, "just checking"); 3853 SystemProperty* prop; 3854 for (prop = pl; prop != NULL; prop = prop->next()) { 3855 if (strcmp(key, prop->key()) == 0) return prop->value(); 3856 } 3857 return NULL; 3858} 3859 3860const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3861 int count = 0; 3862 const char* ret_val = NULL; 3863 3864 while(pl != NULL) { 3865 if(count >= index) { 3866 ret_val = pl->key(); 3867 break; 3868 } 3869 count++; 3870 pl = pl->next(); 3871 } 3872 3873 return ret_val; 3874} 3875 3876char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3877 int count = 0; 3878 char* ret_val = NULL; 3879 3880 while(pl != NULL) { 3881 if(count >= index) { 3882 ret_val = pl->value(); 3883 break; 3884 } 3885 count++; 3886 pl = pl->next(); 3887 } 3888 3889 return ret_val; 3890} 3891 3892void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3893 SystemProperty* p = *plist; 3894 if (p == NULL) { 3895 *plist = new_p; 3896 } else { 3897 while (p->next() != NULL) { 3898 p = p->next(); 3899 } 3900 p->set_next(new_p); 3901 } 3902} 3903 3904void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3905 if (plist == NULL) 3906 return; 3907 3908 SystemProperty* new_p = new SystemProperty(k, v, true); 3909 PropertyList_add(plist, new_p); 3910} 3911 3912// This add maintains unique property key in the list. 3913void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3914 if (plist == NULL) 3915 return; 3916 3917 // If property key exist then update with new value. 3918 SystemProperty* prop; 3919 for (prop = *plist; prop != NULL; prop = prop->next()) { 3920 if (strcmp(k, prop->key()) == 0) { 3921 if (append) { 3922 prop->append_value(v); 3923 } else { 3924 prop->set_value(v); 3925 } 3926 return; 3927 } 3928 } 3929 3930 PropertyList_add(plist, k, v); 3931} 3932 3933// Copies src into buf, replacing "%%" with "%" and "%p" with pid 3934// Returns true if all of the source pointed by src has been copied over to 3935// the destination buffer pointed by buf. Otherwise, returns false. 3936// Notes: 3937// 1. If the length (buflen) of the destination buffer excluding the 3938// NULL terminator character is not long enough for holding the expanded 3939// pid characters, it also returns false instead of returning the partially 3940// expanded one. 3941// 2. The passed in "buflen" should be large enough to hold the null terminator. 3942bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3943 char* buf, size_t buflen) { 3944 const char* p = src; 3945 char* b = buf; 3946 const char* src_end = &src[srclen]; 3947 char* buf_end = &buf[buflen - 1]; 3948 3949 while (p < src_end && b < buf_end) { 3950 if (*p == '%') { 3951 switch (*(++p)) { 3952 case '%': // "%%" ==> "%" 3953 *b++ = *p++; 3954 break; 3955 case 'p': { // "%p" ==> current process id 3956 // buf_end points to the character before the last character so 3957 // that we could write '\0' to the end of the buffer. 3958 size_t buf_sz = buf_end - b + 1; 3959 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3960 3961 // if jio_snprintf fails or the buffer is not long enough to hold 3962 // the expanded pid, returns false. 3963 if (ret < 0 || ret >= (int)buf_sz) { 3964 return false; 3965 } else { 3966 b += ret; 3967 assert(*b == '\0', "fail in copy_expand_pid"); 3968 if (p == src_end && b == buf_end + 1) { 3969 // reach the end of the buffer. 3970 return true; 3971 } 3972 } 3973 p++; 3974 break; 3975 } 3976 default : 3977 *b++ = '%'; 3978 } 3979 } else { 3980 *b++ = *p++; 3981 } 3982 } 3983 *b = '\0'; 3984 return (p == src_end); // return false if not all of the source was copied 3985} 3986