arguments.cpp revision 5215:bb57d48691f5
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/referenceProcessor.hpp" 32#include "memory/universe.inline.hpp" 33#include "oops/oop.inline.hpp" 34#include "prims/jvmtiExport.hpp" 35#include "runtime/arguments.hpp" 36#include "runtime/globals_extension.hpp" 37#include "runtime/java.hpp" 38#include "services/management.hpp" 39#include "services/memTracker.hpp" 40#include "utilities/defaultStream.hpp" 41#include "utilities/macros.hpp" 42#include "utilities/taskqueue.hpp" 43#ifdef TARGET_OS_FAMILY_linux 44# include "os_linux.inline.hpp" 45#endif 46#ifdef TARGET_OS_FAMILY_solaris 47# include "os_solaris.inline.hpp" 48#endif 49#ifdef TARGET_OS_FAMILY_windows 50# include "os_windows.inline.hpp" 51#endif 52#ifdef TARGET_OS_FAMILY_bsd 53# include "os_bsd.inline.hpp" 54#endif 55#if INCLUDE_ALL_GCS 56#include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 57#endif // INCLUDE_ALL_GCS 58 59// Note: This is a special bug reporting site for the JVM 60#define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp" 61#define DEFAULT_JAVA_LAUNCHER "generic" 62 63// Disable options not supported in this release, with a warning if they 64// were explicitly requested on the command-line 65#define UNSUPPORTED_OPTION(opt, description) \ 66do { \ 67 if (opt) { \ 68 if (FLAG_IS_CMDLINE(opt)) { \ 69 warning(description " is disabled in this release."); \ 70 } \ 71 FLAG_SET_DEFAULT(opt, false); \ 72 } \ 73} while(0) 74 75#define UNSUPPORTED_GC_OPTION(gc) \ 76do { \ 77 if (gc) { \ 78 if (FLAG_IS_CMDLINE(gc)) { \ 79 warning(#gc " is not supported in this VM. Using Serial GC."); \ 80 } \ 81 FLAG_SET_DEFAULT(gc, false); \ 82 } \ 83} while(0) 84 85char** Arguments::_jvm_flags_array = NULL; 86int Arguments::_num_jvm_flags = 0; 87char** Arguments::_jvm_args_array = NULL; 88int Arguments::_num_jvm_args = 0; 89char* Arguments::_java_command = NULL; 90SystemProperty* Arguments::_system_properties = NULL; 91const char* Arguments::_gc_log_filename = NULL; 92bool Arguments::_has_profile = false; 93uintx Arguments::_min_heap_size = 0; 94Arguments::Mode Arguments::_mode = _mixed; 95bool Arguments::_java_compiler = false; 96bool Arguments::_xdebug_mode = false; 97const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 98const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 99int Arguments::_sun_java_launcher_pid = -1; 100bool Arguments::_created_by_gamma_launcher = false; 101 102// These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 103bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 104bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 105bool Arguments::_BackgroundCompilation = BackgroundCompilation; 106bool Arguments::_ClipInlining = ClipInlining; 107 108char* Arguments::SharedArchivePath = NULL; 109 110AgentLibraryList Arguments::_libraryList; 111AgentLibraryList Arguments::_agentList; 112 113abort_hook_t Arguments::_abort_hook = NULL; 114exit_hook_t Arguments::_exit_hook = NULL; 115vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 116 117 118SystemProperty *Arguments::_java_ext_dirs = NULL; 119SystemProperty *Arguments::_java_endorsed_dirs = NULL; 120SystemProperty *Arguments::_sun_boot_library_path = NULL; 121SystemProperty *Arguments::_java_library_path = NULL; 122SystemProperty *Arguments::_java_home = NULL; 123SystemProperty *Arguments::_java_class_path = NULL; 124SystemProperty *Arguments::_sun_boot_class_path = NULL; 125 126char* Arguments::_meta_index_path = NULL; 127char* Arguments::_meta_index_dir = NULL; 128 129// Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 130 131static bool match_option(const JavaVMOption *option, const char* name, 132 const char** tail) { 133 int len = (int)strlen(name); 134 if (strncmp(option->optionString, name, len) == 0) { 135 *tail = option->optionString + len; 136 return true; 137 } else { 138 return false; 139 } 140} 141 142static void logOption(const char* opt) { 143 if (PrintVMOptions) { 144 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 145 } 146} 147 148// Process java launcher properties. 149void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 150 // See if sun.java.launcher or sun.java.launcher.pid is defined. 151 // Must do this before setting up other system properties, 152 // as some of them may depend on launcher type. 153 for (int index = 0; index < args->nOptions; index++) { 154 const JavaVMOption* option = args->options + index; 155 const char* tail; 156 157 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 158 process_java_launcher_argument(tail, option->extraInfo); 159 continue; 160 } 161 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 162 _sun_java_launcher_pid = atoi(tail); 163 continue; 164 } 165 } 166} 167 168// Initialize system properties key and value. 169void Arguments::init_system_properties() { 170 171 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 172 "Java Virtual Machine Specification", false)); 173 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 174 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 175 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 176 177 // following are JVMTI agent writeable properties. 178 // Properties values are set to NULL and they are 179 // os specific they are initialized in os::init_system_properties_values(). 180 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 181 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 182 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 183 _java_library_path = new SystemProperty("java.library.path", NULL, true); 184 _java_home = new SystemProperty("java.home", NULL, true); 185 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 186 187 _java_class_path = new SystemProperty("java.class.path", "", true); 188 189 // Add to System Property list. 190 PropertyList_add(&_system_properties, _java_ext_dirs); 191 PropertyList_add(&_system_properties, _java_endorsed_dirs); 192 PropertyList_add(&_system_properties, _sun_boot_library_path); 193 PropertyList_add(&_system_properties, _java_library_path); 194 PropertyList_add(&_system_properties, _java_home); 195 PropertyList_add(&_system_properties, _java_class_path); 196 PropertyList_add(&_system_properties, _sun_boot_class_path); 197 198 // Set OS specific system properties values 199 os::init_system_properties_values(); 200} 201 202 203 // Update/Initialize System properties after JDK version number is known 204void Arguments::init_version_specific_system_properties() { 205 enum { bufsz = 16 }; 206 char buffer[bufsz]; 207 const char* spec_vendor = "Sun Microsystems Inc."; 208 uint32_t spec_version = 0; 209 210 if (JDK_Version::is_gte_jdk17x_version()) { 211 spec_vendor = "Oracle Corporation"; 212 spec_version = JDK_Version::current().major_version(); 213 } 214 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 215 216 PropertyList_add(&_system_properties, 217 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 218 PropertyList_add(&_system_properties, 219 new SystemProperty("java.vm.specification.version", buffer, false)); 220 PropertyList_add(&_system_properties, 221 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 222} 223 224/** 225 * Provide a slightly more user-friendly way of eliminating -XX flags. 226 * When a flag is eliminated, it can be added to this list in order to 227 * continue accepting this flag on the command-line, while issuing a warning 228 * and ignoring the value. Once the JDK version reaches the 'accept_until' 229 * limit, we flatly refuse to admit the existence of the flag. This allows 230 * a flag to die correctly over JDK releases using HSX. 231 */ 232typedef struct { 233 const char* name; 234 JDK_Version obsoleted_in; // when the flag went away 235 JDK_Version accept_until; // which version to start denying the existence 236} ObsoleteFlag; 237 238static ObsoleteFlag obsolete_jvm_flags[] = { 239 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 240 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 241 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 242 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 243 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 244 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 245 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 246 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 247 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 248 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 249 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 250 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 251 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 252 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 253 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 254 { "DefaultInitialRAMFraction", 255 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 256 { "UseDepthFirstScavengeOrder", 257 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 258 { "HandlePromotionFailure", 259 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 260 { "MaxLiveObjectEvacuationRatio", 261 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 262 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 263 { "UseParallelOldGCCompacting", 264 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 265 { "UseParallelDensePrefixUpdate", 266 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 267 { "UseParallelOldGCDensePrefix", 268 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 269 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 270 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 271 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 272 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 273 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 274 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 275 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 276 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 277 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 278 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 279 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 280 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 281 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 282 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 283 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 284 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 285 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 286 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 287 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 288 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 289#ifdef PRODUCT 290 { "DesiredMethodLimit", 291 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 292#endif // PRODUCT 293 { NULL, JDK_Version(0), JDK_Version(0) } 294}; 295 296// Returns true if the flag is obsolete and fits into the range specified 297// for being ignored. In the case that the flag is ignored, the 'version' 298// value is filled in with the version number when the flag became 299// obsolete so that that value can be displayed to the user. 300bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 301 int i = 0; 302 assert(version != NULL, "Must provide a version buffer"); 303 while (obsolete_jvm_flags[i].name != NULL) { 304 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 305 // <flag>=xxx form 306 // [-|+]<flag> form 307 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 308 ((s[0] == '+' || s[0] == '-') && 309 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 310 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 311 *version = flag_status.obsoleted_in; 312 return true; 313 } 314 } 315 i++; 316 } 317 return false; 318} 319 320// Constructs the system class path (aka boot class path) from the following 321// components, in order: 322// 323// prefix // from -Xbootclasspath/p:... 324// endorsed // the expansion of -Djava.endorsed.dirs=... 325// base // from os::get_system_properties() or -Xbootclasspath= 326// suffix // from -Xbootclasspath/a:... 327// 328// java.endorsed.dirs is a list of directories; any jar or zip files in the 329// directories are added to the sysclasspath just before the base. 330// 331// This could be AllStatic, but it isn't needed after argument processing is 332// complete. 333class SysClassPath: public StackObj { 334public: 335 SysClassPath(const char* base); 336 ~SysClassPath(); 337 338 inline void set_base(const char* base); 339 inline void add_prefix(const char* prefix); 340 inline void add_suffix_to_prefix(const char* suffix); 341 inline void add_suffix(const char* suffix); 342 inline void reset_path(const char* base); 343 344 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 345 // property. Must be called after all command-line arguments have been 346 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 347 // combined_path(). 348 void expand_endorsed(); 349 350 inline const char* get_base() const { return _items[_scp_base]; } 351 inline const char* get_prefix() const { return _items[_scp_prefix]; } 352 inline const char* get_suffix() const { return _items[_scp_suffix]; } 353 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 354 355 // Combine all the components into a single c-heap-allocated string; caller 356 // must free the string if/when no longer needed. 357 char* combined_path(); 358 359private: 360 // Utility routines. 361 static char* add_to_path(const char* path, const char* str, bool prepend); 362 static char* add_jars_to_path(char* path, const char* directory); 363 364 inline void reset_item_at(int index); 365 366 // Array indices for the items that make up the sysclasspath. All except the 367 // base are allocated in the C heap and freed by this class. 368 enum { 369 _scp_prefix, // from -Xbootclasspath/p:... 370 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 371 _scp_base, // the default sysclasspath 372 _scp_suffix, // from -Xbootclasspath/a:... 373 _scp_nitems // the number of items, must be last. 374 }; 375 376 const char* _items[_scp_nitems]; 377 DEBUG_ONLY(bool _expansion_done;) 378}; 379 380SysClassPath::SysClassPath(const char* base) { 381 memset(_items, 0, sizeof(_items)); 382 _items[_scp_base] = base; 383 DEBUG_ONLY(_expansion_done = false;) 384} 385 386SysClassPath::~SysClassPath() { 387 // Free everything except the base. 388 for (int i = 0; i < _scp_nitems; ++i) { 389 if (i != _scp_base) reset_item_at(i); 390 } 391 DEBUG_ONLY(_expansion_done = false;) 392} 393 394inline void SysClassPath::set_base(const char* base) { 395 _items[_scp_base] = base; 396} 397 398inline void SysClassPath::add_prefix(const char* prefix) { 399 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 400} 401 402inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 403 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 404} 405 406inline void SysClassPath::add_suffix(const char* suffix) { 407 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 408} 409 410inline void SysClassPath::reset_item_at(int index) { 411 assert(index < _scp_nitems && index != _scp_base, "just checking"); 412 if (_items[index] != NULL) { 413 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 414 _items[index] = NULL; 415 } 416} 417 418inline void SysClassPath::reset_path(const char* base) { 419 // Clear the prefix and suffix. 420 reset_item_at(_scp_prefix); 421 reset_item_at(_scp_suffix); 422 set_base(base); 423} 424 425//------------------------------------------------------------------------------ 426 427void SysClassPath::expand_endorsed() { 428 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 429 430 const char* path = Arguments::get_property("java.endorsed.dirs"); 431 if (path == NULL) { 432 path = Arguments::get_endorsed_dir(); 433 assert(path != NULL, "no default for java.endorsed.dirs"); 434 } 435 436 char* expanded_path = NULL; 437 const char separator = *os::path_separator(); 438 const char* const end = path + strlen(path); 439 while (path < end) { 440 const char* tmp_end = strchr(path, separator); 441 if (tmp_end == NULL) { 442 expanded_path = add_jars_to_path(expanded_path, path); 443 path = end; 444 } else { 445 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 446 memcpy(dirpath, path, tmp_end - path); 447 dirpath[tmp_end - path] = '\0'; 448 expanded_path = add_jars_to_path(expanded_path, dirpath); 449 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 450 path = tmp_end + 1; 451 } 452 } 453 _items[_scp_endorsed] = expanded_path; 454 DEBUG_ONLY(_expansion_done = true;) 455} 456 457// Combine the bootclasspath elements, some of which may be null, into a single 458// c-heap-allocated string. 459char* SysClassPath::combined_path() { 460 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 461 assert(_expansion_done, "must call expand_endorsed() first."); 462 463 size_t lengths[_scp_nitems]; 464 size_t total_len = 0; 465 466 const char separator = *os::path_separator(); 467 468 // Get the lengths. 469 int i; 470 for (i = 0; i < _scp_nitems; ++i) { 471 if (_items[i] != NULL) { 472 lengths[i] = strlen(_items[i]); 473 // Include space for the separator char (or a NULL for the last item). 474 total_len += lengths[i] + 1; 475 } 476 } 477 assert(total_len > 0, "empty sysclasspath not allowed"); 478 479 // Copy the _items to a single string. 480 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 481 char* cp_tmp = cp; 482 for (i = 0; i < _scp_nitems; ++i) { 483 if (_items[i] != NULL) { 484 memcpy(cp_tmp, _items[i], lengths[i]); 485 cp_tmp += lengths[i]; 486 *cp_tmp++ = separator; 487 } 488 } 489 *--cp_tmp = '\0'; // Replace the extra separator. 490 return cp; 491} 492 493// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 494char* 495SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 496 char *cp; 497 498 assert(str != NULL, "just checking"); 499 if (path == NULL) { 500 size_t len = strlen(str) + 1; 501 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 502 memcpy(cp, str, len); // copy the trailing null 503 } else { 504 const char separator = *os::path_separator(); 505 size_t old_len = strlen(path); 506 size_t str_len = strlen(str); 507 size_t len = old_len + str_len + 2; 508 509 if (prepend) { 510 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 511 char* cp_tmp = cp; 512 memcpy(cp_tmp, str, str_len); 513 cp_tmp += str_len; 514 *cp_tmp = separator; 515 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 516 FREE_C_HEAP_ARRAY(char, path, mtInternal); 517 } else { 518 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 519 char* cp_tmp = cp + old_len; 520 *cp_tmp = separator; 521 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 522 } 523 } 524 return cp; 525} 526 527// Scan the directory and append any jar or zip files found to path. 528// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 529char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 530 DIR* dir = os::opendir(directory); 531 if (dir == NULL) return path; 532 533 char dir_sep[2] = { '\0', '\0' }; 534 size_t directory_len = strlen(directory); 535 const char fileSep = *os::file_separator(); 536 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 537 538 /* Scan the directory for jars/zips, appending them to path. */ 539 struct dirent *entry; 540 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 541 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 542 const char* name = entry->d_name; 543 const char* ext = name + strlen(name) - 4; 544 bool isJarOrZip = ext > name && 545 (os::file_name_strcmp(ext, ".jar") == 0 || 546 os::file_name_strcmp(ext, ".zip") == 0); 547 if (isJarOrZip) { 548 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 549 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 550 path = add_to_path(path, jarpath, false); 551 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 552 } 553 } 554 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 555 os::closedir(dir); 556 return path; 557} 558 559// Parses a memory size specification string. 560static bool atomull(const char *s, julong* result) { 561 julong n = 0; 562 int args_read = sscanf(s, JULONG_FORMAT, &n); 563 if (args_read != 1) { 564 return false; 565 } 566 while (*s != '\0' && isdigit(*s)) { 567 s++; 568 } 569 // 4705540: illegal if more characters are found after the first non-digit 570 if (strlen(s) > 1) { 571 return false; 572 } 573 switch (*s) { 574 case 'T': case 't': 575 *result = n * G * K; 576 // Check for overflow. 577 if (*result/((julong)G * K) != n) return false; 578 return true; 579 case 'G': case 'g': 580 *result = n * G; 581 if (*result/G != n) return false; 582 return true; 583 case 'M': case 'm': 584 *result = n * M; 585 if (*result/M != n) return false; 586 return true; 587 case 'K': case 'k': 588 *result = n * K; 589 if (*result/K != n) return false; 590 return true; 591 case '\0': 592 *result = n; 593 return true; 594 default: 595 return false; 596 } 597} 598 599Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 600 if (size < min_size) return arg_too_small; 601 // Check that size will fit in a size_t (only relevant on 32-bit) 602 if (size > max_uintx) return arg_too_big; 603 return arg_in_range; 604} 605 606// Describe an argument out of range error 607void Arguments::describe_range_error(ArgsRange errcode) { 608 switch(errcode) { 609 case arg_too_big: 610 jio_fprintf(defaultStream::error_stream(), 611 "The specified size exceeds the maximum " 612 "representable size.\n"); 613 break; 614 case arg_too_small: 615 case arg_unreadable: 616 case arg_in_range: 617 // do nothing for now 618 break; 619 default: 620 ShouldNotReachHere(); 621 } 622} 623 624static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) { 625 return CommandLineFlags::boolAtPut(name, &value, origin); 626} 627 628static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 629 double v; 630 if (sscanf(value, "%lf", &v) != 1) { 631 return false; 632 } 633 634 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 635 return true; 636 } 637 return false; 638} 639 640static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 641 julong v; 642 intx intx_v; 643 bool is_neg = false; 644 // Check the sign first since atomull() parses only unsigned values. 645 if (*value == '-') { 646 if (!CommandLineFlags::intxAt(name, &intx_v)) { 647 return false; 648 } 649 value++; 650 is_neg = true; 651 } 652 if (!atomull(value, &v)) { 653 return false; 654 } 655 intx_v = (intx) v; 656 if (is_neg) { 657 intx_v = -intx_v; 658 } 659 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 660 return true; 661 } 662 uintx uintx_v = (uintx) v; 663 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 664 return true; 665 } 666 uint64_t uint64_t_v = (uint64_t) v; 667 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 668 return true; 669 } 670 return false; 671} 672 673static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) { 674 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 675 // Contract: CommandLineFlags always returns a pointer that needs freeing. 676 FREE_C_HEAP_ARRAY(char, value, mtInternal); 677 return true; 678} 679 680static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) { 681 const char* old_value = ""; 682 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 683 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 684 size_t new_len = strlen(new_value); 685 const char* value; 686 char* free_this_too = NULL; 687 if (old_len == 0) { 688 value = new_value; 689 } else if (new_len == 0) { 690 value = old_value; 691 } else { 692 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 693 // each new setting adds another LINE to the switch: 694 sprintf(buf, "%s\n%s", old_value, new_value); 695 value = buf; 696 free_this_too = buf; 697 } 698 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 699 // CommandLineFlags always returns a pointer that needs freeing. 700 FREE_C_HEAP_ARRAY(char, value, mtInternal); 701 if (free_this_too != NULL) { 702 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 703 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 704 } 705 return true; 706} 707 708bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) { 709 710 // range of acceptable characters spelled out for portability reasons 711#define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 712#define BUFLEN 255 713 char name[BUFLEN+1]; 714 char dummy; 715 716 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 717 return set_bool_flag(name, false, origin); 718 } 719 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 720 return set_bool_flag(name, true, origin); 721 } 722 723 char punct; 724 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 725 const char* value = strchr(arg, '=') + 1; 726 Flag* flag = Flag::find_flag(name, strlen(name)); 727 if (flag != NULL && flag->is_ccstr()) { 728 if (flag->ccstr_accumulates()) { 729 return append_to_string_flag(name, value, origin); 730 } else { 731 if (value[0] == '\0') { 732 value = NULL; 733 } 734 return set_string_flag(name, value, origin); 735 } 736 } 737 } 738 739 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 740 const char* value = strchr(arg, '=') + 1; 741 // -XX:Foo:=xxx will reset the string flag to the given value. 742 if (value[0] == '\0') { 743 value = NULL; 744 } 745 return set_string_flag(name, value, origin); 746 } 747 748#define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 749#define SIGNED_NUMBER_RANGE "[-0123456789]" 750#define NUMBER_RANGE "[0123456789]" 751 char value[BUFLEN + 1]; 752 char value2[BUFLEN + 1]; 753 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 754 // Looks like a floating-point number -- try again with more lenient format string 755 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 756 return set_fp_numeric_flag(name, value, origin); 757 } 758 } 759 760#define VALUE_RANGE "[-kmgtKMGT0123456789]" 761 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 762 return set_numeric_flag(name, value, origin); 763 } 764 765 return false; 766} 767 768void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 769 assert(bldarray != NULL, "illegal argument"); 770 771 if (arg == NULL) { 772 return; 773 } 774 775 int new_count = *count + 1; 776 777 // expand the array and add arg to the last element 778 if (*bldarray == NULL) { 779 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 780 } else { 781 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 782 } 783 (*bldarray)[*count] = strdup(arg); 784 *count = new_count; 785} 786 787void Arguments::build_jvm_args(const char* arg) { 788 add_string(&_jvm_args_array, &_num_jvm_args, arg); 789} 790 791void Arguments::build_jvm_flags(const char* arg) { 792 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 793} 794 795// utility function to return a string that concatenates all 796// strings in a given char** array 797const char* Arguments::build_resource_string(char** args, int count) { 798 if (args == NULL || count == 0) { 799 return NULL; 800 } 801 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 802 for (int i = 1; i < count; i++) { 803 length += strlen(args[i]) + 1; // add 1 for a space 804 } 805 char* s = NEW_RESOURCE_ARRAY(char, length); 806 strcpy(s, args[0]); 807 for (int j = 1; j < count; j++) { 808 strcat(s, " "); 809 strcat(s, args[j]); 810 } 811 return (const char*) s; 812} 813 814void Arguments::print_on(outputStream* st) { 815 st->print_cr("VM Arguments:"); 816 if (num_jvm_flags() > 0) { 817 st->print("jvm_flags: "); print_jvm_flags_on(st); 818 } 819 if (num_jvm_args() > 0) { 820 st->print("jvm_args: "); print_jvm_args_on(st); 821 } 822 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 823 if (_java_class_path != NULL) { 824 char* path = _java_class_path->value(); 825 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 826 } 827 st->print_cr("Launcher Type: %s", _sun_java_launcher); 828} 829 830void Arguments::print_jvm_flags_on(outputStream* st) { 831 if (_num_jvm_flags > 0) { 832 for (int i=0; i < _num_jvm_flags; i++) { 833 st->print("%s ", _jvm_flags_array[i]); 834 } 835 st->print_cr(""); 836 } 837} 838 839void Arguments::print_jvm_args_on(outputStream* st) { 840 if (_num_jvm_args > 0) { 841 for (int i=0; i < _num_jvm_args; i++) { 842 st->print("%s ", _jvm_args_array[i]); 843 } 844 st->print_cr(""); 845 } 846} 847 848bool Arguments::process_argument(const char* arg, 849 jboolean ignore_unrecognized, FlagValueOrigin origin) { 850 851 JDK_Version since = JDK_Version(); 852 853 if (parse_argument(arg, origin) || ignore_unrecognized) { 854 return true; 855 } 856 857 bool has_plus_minus = (*arg == '+' || *arg == '-'); 858 const char* const argname = has_plus_minus ? arg + 1 : arg; 859 if (is_newly_obsolete(arg, &since)) { 860 char version[256]; 861 since.to_string(version, sizeof(version)); 862 warning("ignoring option %s; support was removed in %s", argname, version); 863 return true; 864 } 865 866 // For locked flags, report a custom error message if available. 867 // Otherwise, report the standard unrecognized VM option. 868 869 size_t arg_len; 870 const char* equal_sign = strchr(argname, '='); 871 if (equal_sign == NULL) { 872 arg_len = strlen(argname); 873 } else { 874 arg_len = equal_sign - argname; 875 } 876 877 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true); 878 if (found_flag != NULL) { 879 char locked_message_buf[BUFLEN]; 880 found_flag->get_locked_message(locked_message_buf, BUFLEN); 881 if (strlen(locked_message_buf) == 0) { 882 if (found_flag->is_bool() && !has_plus_minus) { 883 jio_fprintf(defaultStream::error_stream(), 884 "Missing +/- setting for VM option '%s'\n", argname); 885 } else if (!found_flag->is_bool() && has_plus_minus) { 886 jio_fprintf(defaultStream::error_stream(), 887 "Unexpected +/- setting in VM option '%s'\n", argname); 888 } else { 889 jio_fprintf(defaultStream::error_stream(), 890 "Improperly specified VM option '%s'\n", argname); 891 } 892 } else { 893 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 894 } 895 } else { 896 jio_fprintf(defaultStream::error_stream(), 897 "Unrecognized VM option '%s'\n", argname); 898 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 899 if (fuzzy_matched != NULL) { 900 jio_fprintf(defaultStream::error_stream(), 901 "Did you mean '%s%s%s'?\n", 902 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 903 fuzzy_matched->name, 904 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 905 } 906 } 907 908 // allow for commandline "commenting out" options like -XX:#+Verbose 909 return arg[0] == '#'; 910} 911 912bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 913 FILE* stream = fopen(file_name, "rb"); 914 if (stream == NULL) { 915 if (should_exist) { 916 jio_fprintf(defaultStream::error_stream(), 917 "Could not open settings file %s\n", file_name); 918 return false; 919 } else { 920 return true; 921 } 922 } 923 924 char token[1024]; 925 int pos = 0; 926 927 bool in_white_space = true; 928 bool in_comment = false; 929 bool in_quote = false; 930 char quote_c = 0; 931 bool result = true; 932 933 int c = getc(stream); 934 while(c != EOF && pos < (int)(sizeof(token)-1)) { 935 if (in_white_space) { 936 if (in_comment) { 937 if (c == '\n') in_comment = false; 938 } else { 939 if (c == '#') in_comment = true; 940 else if (!isspace(c)) { 941 in_white_space = false; 942 token[pos++] = c; 943 } 944 } 945 } else { 946 if (c == '\n' || (!in_quote && isspace(c))) { 947 // token ends at newline, or at unquoted whitespace 948 // this allows a way to include spaces in string-valued options 949 token[pos] = '\0'; 950 logOption(token); 951 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 952 build_jvm_flags(token); 953 pos = 0; 954 in_white_space = true; 955 in_quote = false; 956 } else if (!in_quote && (c == '\'' || c == '"')) { 957 in_quote = true; 958 quote_c = c; 959 } else if (in_quote && (c == quote_c)) { 960 in_quote = false; 961 } else { 962 token[pos++] = c; 963 } 964 } 965 c = getc(stream); 966 } 967 if (pos > 0) { 968 token[pos] = '\0'; 969 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 970 build_jvm_flags(token); 971 } 972 fclose(stream); 973 return result; 974} 975 976//============================================================================================================= 977// Parsing of properties (-D) 978 979const char* Arguments::get_property(const char* key) { 980 return PropertyList_get_value(system_properties(), key); 981} 982 983bool Arguments::add_property(const char* prop) { 984 const char* eq = strchr(prop, '='); 985 char* key; 986 // ns must be static--its address may be stored in a SystemProperty object. 987 const static char ns[1] = {0}; 988 char* value = (char *)ns; 989 990 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 991 key = AllocateHeap(key_len + 1, mtInternal); 992 strncpy(key, prop, key_len); 993 key[key_len] = '\0'; 994 995 if (eq != NULL) { 996 size_t value_len = strlen(prop) - key_len - 1; 997 value = AllocateHeap(value_len + 1, mtInternal); 998 strncpy(value, &prop[key_len + 1], value_len + 1); 999 } 1000 1001 if (strcmp(key, "java.compiler") == 0) { 1002 process_java_compiler_argument(value); 1003 FreeHeap(key); 1004 if (eq != NULL) { 1005 FreeHeap(value); 1006 } 1007 return true; 1008 } else if (strcmp(key, "sun.java.command") == 0) { 1009 _java_command = value; 1010 1011 // Record value in Arguments, but let it get passed to Java. 1012 } else if (strcmp(key, "sun.java.launcher.pid") == 0) { 1013 // launcher.pid property is private and is processed 1014 // in process_sun_java_launcher_properties(); 1015 // the sun.java.launcher property is passed on to the java application 1016 FreeHeap(key); 1017 if (eq != NULL) { 1018 FreeHeap(value); 1019 } 1020 return true; 1021 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1022 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1023 // its value without going through the property list or making a Java call. 1024 _java_vendor_url_bug = value; 1025 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1026 PropertyList_unique_add(&_system_properties, key, value, true); 1027 return true; 1028 } 1029 // Create new property and add at the end of the list 1030 PropertyList_unique_add(&_system_properties, key, value); 1031 return true; 1032} 1033 1034//=========================================================================================================== 1035// Setting int/mixed/comp mode flags 1036 1037void Arguments::set_mode_flags(Mode mode) { 1038 // Set up default values for all flags. 1039 // If you add a flag to any of the branches below, 1040 // add a default value for it here. 1041 set_java_compiler(false); 1042 _mode = mode; 1043 1044 // Ensure Agent_OnLoad has the correct initial values. 1045 // This may not be the final mode; mode may change later in onload phase. 1046 PropertyList_unique_add(&_system_properties, "java.vm.info", 1047 (char*)VM_Version::vm_info_string(), false); 1048 1049 UseInterpreter = true; 1050 UseCompiler = true; 1051 UseLoopCounter = true; 1052 1053#ifndef ZERO 1054 // Turn these off for mixed and comp. Leave them on for Zero. 1055 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) { 1056 UseFastAccessorMethods = (mode == _int); 1057 } 1058 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) { 1059 UseFastEmptyMethods = (mode == _int); 1060 } 1061#endif 1062 1063 // Default values may be platform/compiler dependent - 1064 // use the saved values 1065 ClipInlining = Arguments::_ClipInlining; 1066 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1067 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1068 BackgroundCompilation = Arguments::_BackgroundCompilation; 1069 1070 // Change from defaults based on mode 1071 switch (mode) { 1072 default: 1073 ShouldNotReachHere(); 1074 break; 1075 case _int: 1076 UseCompiler = false; 1077 UseLoopCounter = false; 1078 AlwaysCompileLoopMethods = false; 1079 UseOnStackReplacement = false; 1080 break; 1081 case _mixed: 1082 // same as default 1083 break; 1084 case _comp: 1085 UseInterpreter = false; 1086 BackgroundCompilation = false; 1087 ClipInlining = false; 1088 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1089 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1090 // compile a level 4 (C2) and then continue executing it. 1091 if (TieredCompilation) { 1092 Tier3InvokeNotifyFreqLog = 0; 1093 Tier4InvocationThreshold = 0; 1094 } 1095 break; 1096 } 1097} 1098 1099// Conflict: required to use shared spaces (-Xshare:on), but 1100// incompatible command line options were chosen. 1101 1102static void no_shared_spaces() { 1103 if (RequireSharedSpaces) { 1104 jio_fprintf(defaultStream::error_stream(), 1105 "Class data sharing is inconsistent with other specified options.\n"); 1106 vm_exit_during_initialization("Unable to use shared archive.", NULL); 1107 } else { 1108 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1109 } 1110} 1111 1112void Arguments::set_tiered_flags() { 1113 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1114 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1115 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1116 } 1117 if (CompilationPolicyChoice < 2) { 1118 vm_exit_during_initialization( 1119 "Incompatible compilation policy selected", NULL); 1120 } 1121 // Increase the code cache size - tiered compiles a lot more. 1122 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1123 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5); 1124 } 1125 if (!UseInterpreter) { // -Xcomp 1126 Tier3InvokeNotifyFreqLog = 0; 1127 Tier4InvocationThreshold = 0; 1128 } 1129} 1130 1131#if INCLUDE_ALL_GCS 1132static void disable_adaptive_size_policy(const char* collector_name) { 1133 if (UseAdaptiveSizePolicy) { 1134 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1135 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1136 collector_name); 1137 } 1138 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1139 } 1140} 1141 1142void Arguments::set_parnew_gc_flags() { 1143 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1144 "control point invariant"); 1145 assert(UseParNewGC, "Error"); 1146 1147 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1148 disable_adaptive_size_policy("UseParNewGC"); 1149 1150 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1151 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1152 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1153 } else if (ParallelGCThreads == 0) { 1154 jio_fprintf(defaultStream::error_stream(), 1155 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1156 vm_exit(1); 1157 } 1158 1159 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1160 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1161 // we set them to 1024 and 1024. 1162 // See CR 6362902. 1163 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1164 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1165 } 1166 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1167 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1168 } 1169 1170 // AlwaysTenure flag should make ParNew promote all at first collection. 1171 // See CR 6362902. 1172 if (AlwaysTenure) { 1173 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 1174 } 1175 // When using compressed oops, we use local overflow stacks, 1176 // rather than using a global overflow list chained through 1177 // the klass word of the object's pre-image. 1178 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1179 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1180 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1181 } 1182 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1183 } 1184 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1185} 1186 1187// Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1188// sparc/solaris for certain applications, but would gain from 1189// further optimization and tuning efforts, and would almost 1190// certainly gain from analysis of platform and environment. 1191void Arguments::set_cms_and_parnew_gc_flags() { 1192 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1193 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1194 1195 // If we are using CMS, we prefer to UseParNewGC, 1196 // unless explicitly forbidden. 1197 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1198 FLAG_SET_ERGO(bool, UseParNewGC, true); 1199 } 1200 1201 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1202 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1203 1204 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1205 // as needed. 1206 if (UseParNewGC) { 1207 set_parnew_gc_flags(); 1208 } 1209 1210 size_t max_heap = align_size_down(MaxHeapSize, 1211 CardTableRS::ct_max_alignment_constraint()); 1212 1213 // Now make adjustments for CMS 1214 intx tenuring_default = (intx)6; 1215 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1216 1217 // Preferred young gen size for "short" pauses: 1218 // upper bound depends on # of threads and NewRatio. 1219 const uintx parallel_gc_threads = 1220 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1221 const size_t preferred_max_new_size_unaligned = 1222 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1223 size_t preferred_max_new_size = 1224 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1225 1226 // Unless explicitly requested otherwise, size young gen 1227 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1228 1229 // If either MaxNewSize or NewRatio is set on the command line, 1230 // assume the user is trying to set the size of the young gen. 1231 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1232 1233 // Set MaxNewSize to our calculated preferred_max_new_size unless 1234 // NewSize was set on the command line and it is larger than 1235 // preferred_max_new_size. 1236 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1237 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1238 } else { 1239 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1240 } 1241 if (PrintGCDetails && Verbose) { 1242 // Too early to use gclog_or_tty 1243 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1244 } 1245 1246 // Code along this path potentially sets NewSize and OldSize 1247 if (PrintGCDetails && Verbose) { 1248 // Too early to use gclog_or_tty 1249 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1250 " initial_heap_size: " SIZE_FORMAT 1251 " max_heap: " SIZE_FORMAT, 1252 min_heap_size(), InitialHeapSize, max_heap); 1253 } 1254 size_t min_new = preferred_max_new_size; 1255 if (FLAG_IS_CMDLINE(NewSize)) { 1256 min_new = NewSize; 1257 } 1258 if (max_heap > min_new && min_heap_size() > min_new) { 1259 // Unless explicitly requested otherwise, make young gen 1260 // at least min_new, and at most preferred_max_new_size. 1261 if (FLAG_IS_DEFAULT(NewSize)) { 1262 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1263 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1264 if (PrintGCDetails && Verbose) { 1265 // Too early to use gclog_or_tty 1266 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1267 } 1268 } 1269 // Unless explicitly requested otherwise, size old gen 1270 // so it's NewRatio x of NewSize. 1271 if (FLAG_IS_DEFAULT(OldSize)) { 1272 if (max_heap > NewSize) { 1273 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1274 if (PrintGCDetails && Verbose) { 1275 // Too early to use gclog_or_tty 1276 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1277 } 1278 } 1279 } 1280 } 1281 } 1282 // Unless explicitly requested otherwise, definitely 1283 // promote all objects surviving "tenuring_default" scavenges. 1284 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1285 FLAG_IS_DEFAULT(SurvivorRatio)) { 1286 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1287 } 1288 // If we decided above (or user explicitly requested) 1289 // `promote all' (via MaxTenuringThreshold := 0), 1290 // prefer minuscule survivor spaces so as not to waste 1291 // space for (non-existent) survivors 1292 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1293 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1294 } 1295 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1296 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1297 // This is done in order to make ParNew+CMS configuration to work 1298 // with YoungPLABSize and OldPLABSize options. 1299 // See CR 6362902. 1300 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1301 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1302 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1303 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1304 // the value (either from the command line or ergonomics) of 1305 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1306 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1307 } else { 1308 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1309 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1310 // we'll let it to take precedence. 1311 jio_fprintf(defaultStream::error_stream(), 1312 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1313 " options are specified for the CMS collector." 1314 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1315 } 1316 } 1317 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1318 // OldPLAB sizing manually turned off: Use a larger default setting, 1319 // unless it was manually specified. This is because a too-low value 1320 // will slow down scavenges. 1321 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1322 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1323 } 1324 } 1325 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1326 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1327 // If either of the static initialization defaults have changed, note this 1328 // modification. 1329 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1330 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1331 } 1332 if (PrintGCDetails && Verbose) { 1333 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1334 MarkStackSize / K, MarkStackSizeMax / K); 1335 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1336 } 1337} 1338#endif // INCLUDE_ALL_GCS 1339 1340void set_object_alignment() { 1341 // Object alignment. 1342 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1343 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1344 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1345 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1346 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1347 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1348 1349 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1350 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1351 1352 // Oop encoding heap max 1353 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1354 1355#if INCLUDE_ALL_GCS 1356 // Set CMS global values 1357 CompactibleFreeListSpace::set_cms_values(); 1358#endif // INCLUDE_ALL_GCS 1359} 1360 1361bool verify_object_alignment() { 1362 // Object alignment. 1363 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1364 jio_fprintf(defaultStream::error_stream(), 1365 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1366 (int)ObjectAlignmentInBytes); 1367 return false; 1368 } 1369 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1370 jio_fprintf(defaultStream::error_stream(), 1371 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1372 (int)ObjectAlignmentInBytes, BytesPerLong); 1373 return false; 1374 } 1375 // It does not make sense to have big object alignment 1376 // since a space lost due to alignment will be greater 1377 // then a saved space from compressed oops. 1378 if ((int)ObjectAlignmentInBytes > 256) { 1379 jio_fprintf(defaultStream::error_stream(), 1380 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1381 (int)ObjectAlignmentInBytes); 1382 return false; 1383 } 1384 // In case page size is very small. 1385 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1386 jio_fprintf(defaultStream::error_stream(), 1387 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1388 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1389 return false; 1390 } 1391 return true; 1392} 1393 1394inline uintx max_heap_for_compressed_oops() { 1395 // Avoid sign flip. 1396 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1397 LP64_ONLY(return OopEncodingHeapMax - os::vm_page_size()); 1398 NOT_LP64(ShouldNotReachHere(); return 0); 1399} 1400 1401bool Arguments::should_auto_select_low_pause_collector() { 1402 if (UseAutoGCSelectPolicy && 1403 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1404 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1405 if (PrintGCDetails) { 1406 // Cannot use gclog_or_tty yet. 1407 tty->print_cr("Automatic selection of the low pause collector" 1408 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1409 } 1410 return true; 1411 } 1412 return false; 1413} 1414 1415void Arguments::set_use_compressed_oops() { 1416#ifndef ZERO 1417#ifdef _LP64 1418 // MaxHeapSize is not set up properly at this point, but 1419 // the only value that can override MaxHeapSize if we are 1420 // to use UseCompressedOops is InitialHeapSize. 1421 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1422 1423 if (max_heap_size <= max_heap_for_compressed_oops()) { 1424#if !defined(COMPILER1) || defined(TIERED) 1425 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1426 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1427 } 1428#endif 1429#ifdef _WIN64 1430 if (UseLargePages && UseCompressedOops) { 1431 // Cannot allocate guard pages for implicit checks in indexed addressing 1432 // mode, when large pages are specified on windows. 1433 // This flag could be switched ON if narrow oop base address is set to 0, 1434 // see code in Universe::initialize_heap(). 1435 Universe::set_narrow_oop_use_implicit_null_checks(false); 1436 } 1437#endif // _WIN64 1438 } else { 1439 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1440 warning("Max heap size too large for Compressed Oops"); 1441 FLAG_SET_DEFAULT(UseCompressedOops, false); 1442 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1443 } 1444 } 1445#endif // _LP64 1446#endif // ZERO 1447} 1448 1449 1450// NOTE: set_use_compressed_klass_ptrs() must be called after calling 1451// set_use_compressed_oops(). 1452void Arguments::set_use_compressed_klass_ptrs() { 1453#ifndef ZERO 1454#ifdef _LP64 1455 // UseCompressedOops must be on for UseCompressedKlassPointers to be on. 1456 if (!UseCompressedOops) { 1457 if (UseCompressedKlassPointers) { 1458 warning("UseCompressedKlassPointers requires UseCompressedOops"); 1459 } 1460 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1461 } else { 1462 // Turn on UseCompressedKlassPointers too 1463 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) { 1464 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true); 1465 } 1466 // Check the ClassMetaspaceSize to make sure we use compressed klass ptrs. 1467 if (UseCompressedKlassPointers) { 1468 if (ClassMetaspaceSize > KlassEncodingMetaspaceMax) { 1469 warning("Class metaspace size is too large for UseCompressedKlassPointers"); 1470 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1471 } 1472 } 1473 } 1474#endif // _LP64 1475#endif // !ZERO 1476} 1477 1478void Arguments::set_ergonomics_flags() { 1479 1480 if (os::is_server_class_machine()) { 1481 // If no other collector is requested explicitly, 1482 // let the VM select the collector based on 1483 // machine class and automatic selection policy. 1484 if (!UseSerialGC && 1485 !UseConcMarkSweepGC && 1486 !UseG1GC && 1487 !UseParNewGC && 1488 FLAG_IS_DEFAULT(UseParallelGC)) { 1489 if (should_auto_select_low_pause_collector()) { 1490 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1491 } else { 1492 FLAG_SET_ERGO(bool, UseParallelGC, true); 1493 } 1494 } 1495 // Shared spaces work fine with other GCs but causes bytecode rewriting 1496 // to be disabled, which hurts interpreter performance and decreases 1497 // server performance. On server class machines, keep the default 1498 // off unless it is asked for. Future work: either add bytecode rewriting 1499 // at link time, or rewrite bytecodes in non-shared methods. 1500 if (!DumpSharedSpaces && !RequireSharedSpaces && 1501 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1502 no_shared_spaces(); 1503 } 1504 } 1505 1506#ifndef ZERO 1507#ifdef _LP64 1508 set_use_compressed_oops(); 1509 1510 // set_use_compressed_klass_ptrs() must be called after calling 1511 // set_use_compressed_oops(). 1512 set_use_compressed_klass_ptrs(); 1513 1514 // Also checks that certain machines are slower with compressed oops 1515 // in vm_version initialization code. 1516#endif // _LP64 1517#endif // !ZERO 1518} 1519 1520void Arguments::set_parallel_gc_flags() { 1521 assert(UseParallelGC || UseParallelOldGC, "Error"); 1522 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1523 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1524 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1525 } 1526 FLAG_SET_DEFAULT(UseParallelGC, true); 1527 1528 // If no heap maximum was requested explicitly, use some reasonable fraction 1529 // of the physical memory, up to a maximum of 1GB. 1530 FLAG_SET_DEFAULT(ParallelGCThreads, 1531 Abstract_VM_Version::parallel_worker_threads()); 1532 if (ParallelGCThreads == 0) { 1533 jio_fprintf(defaultStream::error_stream(), 1534 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1535 vm_exit(1); 1536 } 1537 1538 1539 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1540 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1541 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1542 // See CR 6362902 for details. 1543 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1544 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1545 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1546 } 1547 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1548 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1549 } 1550 } 1551 1552 if (UseParallelOldGC) { 1553 // Par compact uses lower default values since they are treated as 1554 // minimums. These are different defaults because of the different 1555 // interpretation and are not ergonomically set. 1556 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1557 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1558 } 1559 } 1560} 1561 1562void Arguments::set_g1_gc_flags() { 1563 assert(UseG1GC, "Error"); 1564#ifdef COMPILER1 1565 FastTLABRefill = false; 1566#endif 1567 FLAG_SET_DEFAULT(ParallelGCThreads, 1568 Abstract_VM_Version::parallel_worker_threads()); 1569 if (ParallelGCThreads == 0) { 1570 FLAG_SET_DEFAULT(ParallelGCThreads, 1571 Abstract_VM_Version::parallel_worker_threads()); 1572 } 1573 1574 // MarkStackSize will be set (if it hasn't been set by the user) 1575 // when concurrent marking is initialized. 1576 // Its value will be based upon the number of parallel marking threads. 1577 // But we do set the maximum mark stack size here. 1578 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1579 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1580 } 1581 1582 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1583 // In G1, we want the default GC overhead goal to be higher than 1584 // say in PS. So we set it here to 10%. Otherwise the heap might 1585 // be expanded more aggressively than we would like it to. In 1586 // fact, even 10% seems to not be high enough in some cases 1587 // (especially small GC stress tests that the main thing they do 1588 // is allocation). We might consider increase it further. 1589 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1590 } 1591 1592 if (PrintGCDetails && Verbose) { 1593 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1594 MarkStackSize / K, MarkStackSizeMax / K); 1595 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1596 } 1597} 1598 1599julong Arguments::limit_by_allocatable_memory(julong limit) { 1600 julong max_allocatable; 1601 julong result = limit; 1602 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1603 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1604 } 1605 return result; 1606} 1607 1608void Arguments::set_heap_size() { 1609 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1610 // Deprecated flag 1611 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1612 } 1613 1614 const julong phys_mem = 1615 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1616 : (julong)MaxRAM; 1617 1618 // If the maximum heap size has not been set with -Xmx, 1619 // then set it as fraction of the size of physical memory, 1620 // respecting the maximum and minimum sizes of the heap. 1621 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1622 julong reasonable_max = phys_mem / MaxRAMFraction; 1623 1624 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1625 // Small physical memory, so use a minimum fraction of it for the heap 1626 reasonable_max = phys_mem / MinRAMFraction; 1627 } else { 1628 // Not-small physical memory, so require a heap at least 1629 // as large as MaxHeapSize 1630 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1631 } 1632 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1633 // Limit the heap size to ErgoHeapSizeLimit 1634 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1635 } 1636 if (UseCompressedOops) { 1637 // Limit the heap size to the maximum possible when using compressed oops 1638 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1639 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1640 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1641 // but it should be not less than default MaxHeapSize. 1642 max_coop_heap -= HeapBaseMinAddress; 1643 } 1644 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1645 } 1646 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1647 1648 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1649 // An initial heap size was specified on the command line, 1650 // so be sure that the maximum size is consistent. Done 1651 // after call to limit_by_allocatable_memory because that 1652 // method might reduce the allocation size. 1653 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1654 } 1655 1656 if (PrintGCDetails && Verbose) { 1657 // Cannot use gclog_or_tty yet. 1658 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1659 } 1660 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1661 } 1662 1663 // If the minimum or initial heap_size have not been set or requested to be set 1664 // ergonomically, set them accordingly. 1665 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1666 julong reasonable_minimum = (julong)(OldSize + NewSize); 1667 1668 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1669 1670 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1671 1672 if (InitialHeapSize == 0) { 1673 julong reasonable_initial = phys_mem / InitialRAMFraction; 1674 1675 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1676 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1677 1678 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1679 1680 if (PrintGCDetails && Verbose) { 1681 // Cannot use gclog_or_tty yet. 1682 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1683 } 1684 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1685 } 1686 // If the minimum heap size has not been set (via -Xms), 1687 // synchronize with InitialHeapSize to avoid errors with the default value. 1688 if (min_heap_size() == 0) { 1689 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1690 if (PrintGCDetails && Verbose) { 1691 // Cannot use gclog_or_tty yet. 1692 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1693 } 1694 } 1695 } 1696} 1697 1698// This must be called after ergonomics because we want bytecode rewriting 1699// if the server compiler is used, or if UseSharedSpaces is disabled. 1700void Arguments::set_bytecode_flags() { 1701 // Better not attempt to store into a read-only space. 1702 if (UseSharedSpaces) { 1703 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1704 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1705 } 1706 1707 if (!RewriteBytecodes) { 1708 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1709 } 1710} 1711 1712// Aggressive optimization flags -XX:+AggressiveOpts 1713void Arguments::set_aggressive_opts_flags() { 1714#ifdef COMPILER2 1715 if (AggressiveUnboxing) { 1716 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1717 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1718 } else if (!EliminateAutoBox) { 1719 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1720 AggressiveUnboxing = false; 1721 } 1722 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1723 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1724 } else if (!DoEscapeAnalysis) { 1725 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1726 AggressiveUnboxing = false; 1727 } 1728 } 1729 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1730 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1731 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1732 } 1733 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1734 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1735 } 1736 1737 // Feed the cache size setting into the JDK 1738 char buffer[1024]; 1739 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1740 add_property(buffer); 1741 } 1742 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1743 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1744 } 1745#endif 1746 1747 if (AggressiveOpts) { 1748// Sample flag setting code 1749// if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1750// FLAG_SET_DEFAULT(EliminateZeroing, true); 1751// } 1752 } 1753} 1754 1755//=========================================================================================================== 1756// Parsing of java.compiler property 1757 1758void Arguments::process_java_compiler_argument(char* arg) { 1759 // For backwards compatibility, Djava.compiler=NONE or "" 1760 // causes us to switch to -Xint mode UNLESS -Xdebug 1761 // is also specified. 1762 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1763 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1764 } 1765} 1766 1767void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1768 _sun_java_launcher = strdup(launcher); 1769 if (strcmp("gamma", _sun_java_launcher) == 0) { 1770 _created_by_gamma_launcher = true; 1771 } 1772} 1773 1774bool Arguments::created_by_java_launcher() { 1775 assert(_sun_java_launcher != NULL, "property must have value"); 1776 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1777} 1778 1779bool Arguments::created_by_gamma_launcher() { 1780 return _created_by_gamma_launcher; 1781} 1782 1783//=========================================================================================================== 1784// Parsing of main arguments 1785 1786bool Arguments::verify_interval(uintx val, uintx min, 1787 uintx max, const char* name) { 1788 // Returns true iff value is in the inclusive interval [min..max] 1789 // false, otherwise. 1790 if (val >= min && val <= max) { 1791 return true; 1792 } 1793 jio_fprintf(defaultStream::error_stream(), 1794 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1795 " and " UINTX_FORMAT "\n", 1796 name, val, min, max); 1797 return false; 1798} 1799 1800bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1801 // Returns true if given value is at least specified min threshold 1802 // false, otherwise. 1803 if (val >= min ) { 1804 return true; 1805 } 1806 jio_fprintf(defaultStream::error_stream(), 1807 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1808 name, val, min); 1809 return false; 1810} 1811 1812bool Arguments::verify_percentage(uintx value, const char* name) { 1813 if (value <= 100) { 1814 return true; 1815 } 1816 jio_fprintf(defaultStream::error_stream(), 1817 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1818 name, value); 1819 return false; 1820} 1821 1822#if !INCLUDE_ALL_GCS 1823#ifdef ASSERT 1824static bool verify_serial_gc_flags() { 1825 return (UseSerialGC && 1826 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1827 UseParallelGC || UseParallelOldGC)); 1828} 1829#endif // ASSERT 1830#endif // INCLUDE_ALL_GCS 1831 1832// check if do gclog rotation 1833// +UseGCLogFileRotation is a must, 1834// no gc log rotation when log file not supplied or 1835// NumberOfGCLogFiles is 0, or GCLogFileSize is 0 1836void check_gclog_consistency() { 1837 if (UseGCLogFileRotation) { 1838 if ((Arguments::gc_log_filename() == NULL) || 1839 (NumberOfGCLogFiles == 0) || 1840 (GCLogFileSize == 0)) { 1841 jio_fprintf(defaultStream::output_stream(), 1842 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n" 1843 "where num_of_file > 0 and num_of_size > 0\n" 1844 "GC log rotation is turned off\n"); 1845 UseGCLogFileRotation = false; 1846 } 1847 } 1848 1849 if (UseGCLogFileRotation && GCLogFileSize < 8*K) { 1850 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1851 jio_fprintf(defaultStream::output_stream(), 1852 "GCLogFileSize changed to minimum 8K\n"); 1853 } 1854} 1855 1856// Check consistency of GC selection 1857bool Arguments::check_gc_consistency() { 1858 check_gclog_consistency(); 1859 bool status = true; 1860 // Ensure that the user has not selected conflicting sets 1861 // of collectors. [Note: this check is merely a user convenience; 1862 // collectors over-ride each other so that only a non-conflicting 1863 // set is selected; however what the user gets is not what they 1864 // may have expected from the combination they asked for. It's 1865 // better to reduce user confusion by not allowing them to 1866 // select conflicting combinations. 1867 uint i = 0; 1868 if (UseSerialGC) i++; 1869 if (UseConcMarkSweepGC || UseParNewGC) i++; 1870 if (UseParallelGC || UseParallelOldGC) i++; 1871 if (UseG1GC) i++; 1872 if (i > 1) { 1873 jio_fprintf(defaultStream::error_stream(), 1874 "Conflicting collector combinations in option list; " 1875 "please refer to the release notes for the combinations " 1876 "allowed\n"); 1877 status = false; 1878 } else if (ReservedCodeCacheSize > 2*G) { 1879 // Code cache size larger than MAXINT is not supported. 1880 jio_fprintf(defaultStream::error_stream(), 1881 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 1882 (2*G)/M); 1883 status = false; 1884 } 1885 return status; 1886} 1887 1888void Arguments::check_deprecated_gcs() { 1889 if (UseConcMarkSweepGC && !UseParNewGC) { 1890 warning("Using the DefNew young collector with the CMS collector is deprecated " 1891 "and will likely be removed in a future release"); 1892 } 1893 1894 if (UseParNewGC && !UseConcMarkSweepGC) { 1895 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 1896 // set up UseSerialGC properly, so that can't be used in the check here. 1897 warning("Using the ParNew young collector with the Serial old collector is deprecated " 1898 "and will likely be removed in a future release"); 1899 } 1900 1901 if (CMSIncrementalMode) { 1902 warning("Using incremental CMS is deprecated and will likely be removed in a future release"); 1903 } 1904} 1905 1906void Arguments::check_deprecated_gc_flags() { 1907 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 1908 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 1909 "and will likely be removed in future release"); 1910 } 1911 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 1912 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 1913 "Use MaxRAMFraction instead."); 1914 } 1915} 1916 1917// Check stack pages settings 1918bool Arguments::check_stack_pages() 1919{ 1920 bool status = true; 1921 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 1922 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 1923 // greater stack shadow pages can't generate instruction to bang stack 1924 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 1925 return status; 1926} 1927 1928// Check the consistency of vm_init_args 1929bool Arguments::check_vm_args_consistency() { 1930 // Method for adding checks for flag consistency. 1931 // The intent is to warn the user of all possible conflicts, 1932 // before returning an error. 1933 // Note: Needs platform-dependent factoring. 1934 bool status = true; 1935 1936 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 1937 // builds so the cost of stack banging can be measured. 1938#if (defined(PRODUCT) && defined(SOLARIS)) 1939 if (!UseBoundThreads && !UseStackBanging) { 1940 jio_fprintf(defaultStream::error_stream(), 1941 "-UseStackBanging conflicts with -UseBoundThreads\n"); 1942 1943 status = false; 1944 } 1945#endif 1946 1947 if (TLABRefillWasteFraction == 0) { 1948 jio_fprintf(defaultStream::error_stream(), 1949 "TLABRefillWasteFraction should be a denominator, " 1950 "not " SIZE_FORMAT "\n", 1951 TLABRefillWasteFraction); 1952 status = false; 1953 } 1954 1955 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 1956 "AdaptiveSizePolicyWeight"); 1957 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 1958 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 1959 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 1960 1961 // Divide by bucket size to prevent a large size from causing rollover when 1962 // calculating amount of memory needed to be allocated for the String table. 1963 status = status && verify_interval(StringTableSize, minimumStringTableSize, 1964 (max_uintx / StringTable::bucket_size()), "StringTable size"); 1965 1966 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 1967 jio_fprintf(defaultStream::error_stream(), 1968 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1969 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 1970 MinHeapFreeRatio, MaxHeapFreeRatio); 1971 status = false; 1972 } 1973 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1974 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 1975 1976 // Min/MaxMetaspaceFreeRatio 1977 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 1978 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 1979 1980 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 1981 jio_fprintf(defaultStream::error_stream(), 1982 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 1983 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 1984 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 1985 MinMetaspaceFreeRatio, 1986 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 1987 MaxMetaspaceFreeRatio); 1988 status = false; 1989 } 1990 1991 // Trying to keep 100% free is not practical 1992 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 1993 1994 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 1995 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 1996 } 1997 1998 if (UseParallelOldGC && ParallelOldGCSplitALot) { 1999 // Settings to encourage splitting. 2000 if (!FLAG_IS_CMDLINE(NewRatio)) { 2001 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2002 } 2003 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2004 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2005 } 2006 } 2007 2008 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2009 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2010 if (GCTimeLimit == 100) { 2011 // Turn off gc-overhead-limit-exceeded checks 2012 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2013 } 2014 2015 status = status && check_gc_consistency(); 2016 status = status && check_stack_pages(); 2017 2018 if (CMSIncrementalMode) { 2019 if (!UseConcMarkSweepGC) { 2020 jio_fprintf(defaultStream::error_stream(), 2021 "error: invalid argument combination.\n" 2022 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 2023 "selected in order\nto use CMSIncrementalMode.\n"); 2024 status = false; 2025 } else { 2026 status = status && verify_percentage(CMSIncrementalDutyCycle, 2027 "CMSIncrementalDutyCycle"); 2028 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 2029 "CMSIncrementalDutyCycleMin"); 2030 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2031 "CMSIncrementalSafetyFactor"); 2032 status = status && verify_percentage(CMSIncrementalOffset, 2033 "CMSIncrementalOffset"); 2034 status = status && verify_percentage(CMSExpAvgFactor, 2035 "CMSExpAvgFactor"); 2036 // If it was not set on the command line, set 2037 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 2038 if (CMSInitiatingOccupancyFraction < 0) { 2039 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 2040 } 2041 } 2042 } 2043 2044 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2045 // insists that we hold the requisite locks so that the iteration is 2046 // MT-safe. For the verification at start-up and shut-down, we don't 2047 // yet have a good way of acquiring and releasing these locks, 2048 // which are not visible at the CollectedHeap level. We want to 2049 // be able to acquire these locks and then do the iteration rather 2050 // than just disable the lock verification. This will be fixed under 2051 // bug 4788986. 2052 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2053 if (VerifyDuringStartup) { 2054 warning("Heap verification at start-up disabled " 2055 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2056 VerifyDuringStartup = false; // Disable verification at start-up 2057 } 2058 2059 if (VerifyBeforeExit) { 2060 warning("Heap verification at shutdown disabled " 2061 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2062 VerifyBeforeExit = false; // Disable verification at shutdown 2063 } 2064 } 2065 2066 // Note: only executed in non-PRODUCT mode 2067 if (!UseAsyncConcMarkSweepGC && 2068 (ExplicitGCInvokesConcurrent || 2069 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2070 jio_fprintf(defaultStream::error_stream(), 2071 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2072 " with -UseAsyncConcMarkSweepGC"); 2073 status = false; 2074 } 2075 2076 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2077 2078#if INCLUDE_ALL_GCS 2079 if (UseG1GC) { 2080 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2081 "InitiatingHeapOccupancyPercent"); 2082 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2083 "G1RefProcDrainInterval"); 2084 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2085 "G1ConcMarkStepDurationMillis"); 2086 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2087 "G1ConcRSHotCardLimit"); 2088 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2089 "G1ConcRSLogCacheSize"); 2090 } 2091 if (UseConcMarkSweepGC) { 2092 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2093 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2094 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2095 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2096 2097 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2098 2099 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2100 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2101 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2102 2103 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2104 2105 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2106 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2107 2108 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2109 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2110 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2111 2112 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2113 2114 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2115 2116 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2117 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2118 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2119 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2120 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2121 } 2122 2123 if (UseParallelGC || UseParallelOldGC) { 2124 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2125 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2126 2127 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2128 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2129 2130 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2131 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2132 2133 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2134 2135 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2136 } 2137#endif // INCLUDE_ALL_GCS 2138 2139 status = status && verify_interval(RefDiscoveryPolicy, 2140 ReferenceProcessor::DiscoveryPolicyMin, 2141 ReferenceProcessor::DiscoveryPolicyMax, 2142 "RefDiscoveryPolicy"); 2143 2144 // Limit the lower bound of this flag to 1 as it is used in a division 2145 // expression. 2146 status = status && verify_interval(TLABWasteTargetPercent, 2147 1, 100, "TLABWasteTargetPercent"); 2148 2149 status = status && verify_object_alignment(); 2150 2151 status = status && verify_interval(ClassMetaspaceSize, 1*M, 3*G, 2152 "ClassMetaspaceSize"); 2153 2154 status = status && verify_interval(MarkStackSizeMax, 2155 1, (max_jint - 1), "MarkStackSizeMax"); 2156 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2157 2158 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2159 2160 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2161 2162 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2163 2164 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2165 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2166 2167 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2168 2169 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2170 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2171 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2172 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2173 2174 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2175 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2176 2177 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2178 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2179 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2180 2181 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2182 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2183 2184 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp 2185 // just for that, so hardcode here. 2186 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold"); 2187 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold"); 2188 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2189 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2190 2191 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2192#ifdef SPARC 2193 if (UseConcMarkSweepGC || UseG1GC) { 2194 // Issue a stern warning if the user has explicitly set 2195 // UseMemSetInBOT (it is known to cause issues), but allow 2196 // use for experimentation and debugging. 2197 if (VM_Version::is_sun4v() && UseMemSetInBOT) { 2198 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error"); 2199 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability" 2200 " on sun4v; please understand that you are using at your own risk!"); 2201 } 2202 } 2203#endif // SPARC 2204 2205 if (PrintNMTStatistics) { 2206#if INCLUDE_NMT 2207 if (MemTracker::tracking_level() == MemTracker::NMT_off) { 2208#endif // INCLUDE_NMT 2209 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2210 PrintNMTStatistics = false; 2211#if INCLUDE_NMT 2212 } 2213#endif 2214 } 2215 2216 // Need to limit the extent of the padding to reasonable size. 2217 // 8K is well beyond the reasonable HW cache line size, even with the 2218 // aggressive prefetching, while still leaving the room for segregating 2219 // among the distinct pages. 2220 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2221 jio_fprintf(defaultStream::error_stream(), 2222 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2223 ContendedPaddingWidth, 0, 8192); 2224 status = false; 2225 } 2226 2227 // Need to enforce the padding not to break the existing field alignments. 2228 // It is sufficient to check against the largest type size. 2229 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2230 jio_fprintf(defaultStream::error_stream(), 2231 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2232 ContendedPaddingWidth, BytesPerLong); 2233 status = false; 2234 } 2235 2236 // Check lower bounds of the code cache 2237 // Template Interpreter code is approximately 3X larger in debug builds. 2238 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace; 2239 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2240 jio_fprintf(defaultStream::error_stream(), 2241 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2242 os::vm_page_size()/K); 2243 status = false; 2244 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2245 jio_fprintf(defaultStream::error_stream(), 2246 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2247 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2248 status = false; 2249 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2250 jio_fprintf(defaultStream::error_stream(), 2251 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2252 min_code_cache_size/K); 2253 status = false; 2254 } else if (ReservedCodeCacheSize > 2*G) { 2255 // Code cache size larger than MAXINT is not supported. 2256 jio_fprintf(defaultStream::error_stream(), 2257 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2258 (2*G)/M); 2259 status = false; 2260 } 2261 return status; 2262} 2263 2264bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2265 const char* option_type) { 2266 if (ignore) return false; 2267 2268 const char* spacer = " "; 2269 if (option_type == NULL) { 2270 option_type = ++spacer; // Set both to the empty string. 2271 } 2272 2273 if (os::obsolete_option(option)) { 2274 jio_fprintf(defaultStream::error_stream(), 2275 "Obsolete %s%soption: %s\n", option_type, spacer, 2276 option->optionString); 2277 return false; 2278 } else { 2279 jio_fprintf(defaultStream::error_stream(), 2280 "Unrecognized %s%soption: %s\n", option_type, spacer, 2281 option->optionString); 2282 return true; 2283 } 2284} 2285 2286static const char* user_assertion_options[] = { 2287 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2288}; 2289 2290static const char* system_assertion_options[] = { 2291 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2292}; 2293 2294// Return true if any of the strings in null-terminated array 'names' matches. 2295// If tail_allowed is true, then the tail must begin with a colon; otherwise, 2296// the option must match exactly. 2297static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2298 bool tail_allowed) { 2299 for (/* empty */; *names != NULL; ++names) { 2300 if (match_option(option, *names, tail)) { 2301 if (**tail == '\0' || tail_allowed && **tail == ':') { 2302 return true; 2303 } 2304 } 2305 } 2306 return false; 2307} 2308 2309bool Arguments::parse_uintx(const char* value, 2310 uintx* uintx_arg, 2311 uintx min_size) { 2312 2313 // Check the sign first since atomull() parses only unsigned values. 2314 bool value_is_positive = !(*value == '-'); 2315 2316 if (value_is_positive) { 2317 julong n; 2318 bool good_return = atomull(value, &n); 2319 if (good_return) { 2320 bool above_minimum = n >= min_size; 2321 bool value_is_too_large = n > max_uintx; 2322 2323 if (above_minimum && !value_is_too_large) { 2324 *uintx_arg = n; 2325 return true; 2326 } 2327 } 2328 } 2329 return false; 2330} 2331 2332Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2333 julong* long_arg, 2334 julong min_size) { 2335 if (!atomull(s, long_arg)) return arg_unreadable; 2336 return check_memory_size(*long_arg, min_size); 2337} 2338 2339// Parse JavaVMInitArgs structure 2340 2341jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2342 // For components of the system classpath. 2343 SysClassPath scp(Arguments::get_sysclasspath()); 2344 bool scp_assembly_required = false; 2345 2346 // Save default settings for some mode flags 2347 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2348 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2349 Arguments::_ClipInlining = ClipInlining; 2350 Arguments::_BackgroundCompilation = BackgroundCompilation; 2351 2352 // Setup flags for mixed which is the default 2353 set_mode_flags(_mixed); 2354 2355 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2356 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2357 if (result != JNI_OK) { 2358 return result; 2359 } 2360 2361 // Parse JavaVMInitArgs structure passed in 2362 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE); 2363 if (result != JNI_OK) { 2364 return result; 2365 } 2366 2367 if (AggressiveOpts) { 2368 // Insert alt-rt.jar between user-specified bootclasspath 2369 // prefix and the default bootclasspath. os::set_boot_path() 2370 // uses meta_index_dir as the default bootclasspath directory. 2371 const char* altclasses_jar = "alt-rt.jar"; 2372 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 + 2373 strlen(altclasses_jar); 2374 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal); 2375 strcpy(altclasses_path, get_meta_index_dir()); 2376 strcat(altclasses_path, altclasses_jar); 2377 scp.add_suffix_to_prefix(altclasses_path); 2378 scp_assembly_required = true; 2379 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal); 2380 } 2381 2382 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2383 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2384 if (result != JNI_OK) { 2385 return result; 2386 } 2387 2388 // Do final processing now that all arguments have been parsed 2389 result = finalize_vm_init_args(&scp, scp_assembly_required); 2390 if (result != JNI_OK) { 2391 return result; 2392 } 2393 2394 return JNI_OK; 2395} 2396 2397// Checks if name in command-line argument -agent{lib,path}:name[=options] 2398// represents a valid HPROF of JDWP agent. is_path==true denotes that we 2399// are dealing with -agentpath (case where name is a path), otherwise with 2400// -agentlib 2401bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2402 char *_name; 2403 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2404 size_t _len_hprof, _len_jdwp, _len_prefix; 2405 2406 if (is_path) { 2407 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2408 return false; 2409 } 2410 2411 _name++; // skip past last path separator 2412 _len_prefix = strlen(JNI_LIB_PREFIX); 2413 2414 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2415 return false; 2416 } 2417 2418 _name += _len_prefix; 2419 _len_hprof = strlen(_hprof); 2420 _len_jdwp = strlen(_jdwp); 2421 2422 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2423 _name += _len_hprof; 2424 } 2425 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2426 _name += _len_jdwp; 2427 } 2428 else { 2429 return false; 2430 } 2431 2432 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2433 return false; 2434 } 2435 2436 return true; 2437 } 2438 2439 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2440 return true; 2441 } 2442 2443 return false; 2444} 2445 2446jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2447 SysClassPath* scp_p, 2448 bool* scp_assembly_required_p, 2449 FlagValueOrigin origin) { 2450 // Remaining part of option string 2451 const char* tail; 2452 2453 // iterate over arguments 2454 for (int index = 0; index < args->nOptions; index++) { 2455 bool is_absolute_path = false; // for -agentpath vs -agentlib 2456 2457 const JavaVMOption* option = args->options + index; 2458 2459 if (!match_option(option, "-Djava.class.path", &tail) && 2460 !match_option(option, "-Dsun.java.command", &tail) && 2461 !match_option(option, "-Dsun.java.launcher", &tail)) { 2462 2463 // add all jvm options to the jvm_args string. This string 2464 // is used later to set the java.vm.args PerfData string constant. 2465 // the -Djava.class.path and the -Dsun.java.command options are 2466 // omitted from jvm_args string as each have their own PerfData 2467 // string constant object. 2468 build_jvm_args(option->optionString); 2469 } 2470 2471 // -verbose:[class/gc/jni] 2472 if (match_option(option, "-verbose", &tail)) { 2473 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2474 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2475 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2476 } else if (!strcmp(tail, ":gc")) { 2477 FLAG_SET_CMDLINE(bool, PrintGC, true); 2478 } else if (!strcmp(tail, ":jni")) { 2479 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2480 } 2481 // -da / -ea / -disableassertions / -enableassertions 2482 // These accept an optional class/package name separated by a colon, e.g., 2483 // -da:java.lang.Thread. 2484 } else if (match_option(option, user_assertion_options, &tail, true)) { 2485 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2486 if (*tail == '\0') { 2487 JavaAssertions::setUserClassDefault(enable); 2488 } else { 2489 assert(*tail == ':', "bogus match by match_option()"); 2490 JavaAssertions::addOption(tail + 1, enable); 2491 } 2492 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2493 } else if (match_option(option, system_assertion_options, &tail, false)) { 2494 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2495 JavaAssertions::setSystemClassDefault(enable); 2496 // -bootclasspath: 2497 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2498 scp_p->reset_path(tail); 2499 *scp_assembly_required_p = true; 2500 // -bootclasspath/a: 2501 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2502 scp_p->add_suffix(tail); 2503 *scp_assembly_required_p = true; 2504 // -bootclasspath/p: 2505 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2506 scp_p->add_prefix(tail); 2507 *scp_assembly_required_p = true; 2508 // -Xrun 2509 } else if (match_option(option, "-Xrun", &tail)) { 2510 if (tail != NULL) { 2511 const char* pos = strchr(tail, ':'); 2512 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2513 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2514 name[len] = '\0'; 2515 2516 char *options = NULL; 2517 if(pos != NULL) { 2518 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2519 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2520 } 2521#if !INCLUDE_JVMTI 2522 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2523 jio_fprintf(defaultStream::error_stream(), 2524 "Profiling and debugging agents are not supported in this VM\n"); 2525 return JNI_ERR; 2526 } 2527#endif // !INCLUDE_JVMTI 2528 add_init_library(name, options); 2529 } 2530 // -agentlib and -agentpath 2531 } else if (match_option(option, "-agentlib:", &tail) || 2532 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2533 if(tail != NULL) { 2534 const char* pos = strchr(tail, '='); 2535 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2536 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2537 name[len] = '\0'; 2538 2539 char *options = NULL; 2540 if(pos != NULL) { 2541 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2542 } 2543#if !INCLUDE_JVMTI 2544 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2545 jio_fprintf(defaultStream::error_stream(), 2546 "Profiling and debugging agents are not supported in this VM\n"); 2547 return JNI_ERR; 2548 } 2549#endif // !INCLUDE_JVMTI 2550 add_init_agent(name, options, is_absolute_path); 2551 } 2552 // -javaagent 2553 } else if (match_option(option, "-javaagent:", &tail)) { 2554#if !INCLUDE_JVMTI 2555 jio_fprintf(defaultStream::error_stream(), 2556 "Instrumentation agents are not supported in this VM\n"); 2557 return JNI_ERR; 2558#else 2559 if(tail != NULL) { 2560 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2561 add_init_agent("instrument", options, false); 2562 } 2563#endif // !INCLUDE_JVMTI 2564 // -Xnoclassgc 2565 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2566 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2567 // -Xincgc: i-CMS 2568 } else if (match_option(option, "-Xincgc", &tail)) { 2569 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2570 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2571 // -Xnoincgc: no i-CMS 2572 } else if (match_option(option, "-Xnoincgc", &tail)) { 2573 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2574 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2575 // -Xconcgc 2576 } else if (match_option(option, "-Xconcgc", &tail)) { 2577 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2578 // -Xnoconcgc 2579 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2580 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2581 // -Xbatch 2582 } else if (match_option(option, "-Xbatch", &tail)) { 2583 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2584 // -Xmn for compatibility with other JVM vendors 2585 } else if (match_option(option, "-Xmn", &tail)) { 2586 julong long_initial_eden_size = 0; 2587 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1); 2588 if (errcode != arg_in_range) { 2589 jio_fprintf(defaultStream::error_stream(), 2590 "Invalid initial eden size: %s\n", option->optionString); 2591 describe_range_error(errcode); 2592 return JNI_EINVAL; 2593 } 2594 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size); 2595 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size); 2596 // -Xms 2597 } else if (match_option(option, "-Xms", &tail)) { 2598 julong long_initial_heap_size = 0; 2599 // an initial heap size of 0 means automatically determine 2600 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2601 if (errcode != arg_in_range) { 2602 jio_fprintf(defaultStream::error_stream(), 2603 "Invalid initial heap size: %s\n", option->optionString); 2604 describe_range_error(errcode); 2605 return JNI_EINVAL; 2606 } 2607 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2608 // Currently the minimum size and the initial heap sizes are the same. 2609 set_min_heap_size(InitialHeapSize); 2610 // -Xmx 2611 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2612 julong long_max_heap_size = 0; 2613 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2614 if (errcode != arg_in_range) { 2615 jio_fprintf(defaultStream::error_stream(), 2616 "Invalid maximum heap size: %s\n", option->optionString); 2617 describe_range_error(errcode); 2618 return JNI_EINVAL; 2619 } 2620 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2621 // Xmaxf 2622 } else if (match_option(option, "-Xmaxf", &tail)) { 2623 int maxf = (int)(atof(tail) * 100); 2624 if (maxf < 0 || maxf > 100) { 2625 jio_fprintf(defaultStream::error_stream(), 2626 "Bad max heap free percentage size: %s\n", 2627 option->optionString); 2628 return JNI_EINVAL; 2629 } else { 2630 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2631 } 2632 // Xminf 2633 } else if (match_option(option, "-Xminf", &tail)) { 2634 int minf = (int)(atof(tail) * 100); 2635 if (minf < 0 || minf > 100) { 2636 jio_fprintf(defaultStream::error_stream(), 2637 "Bad min heap free percentage size: %s\n", 2638 option->optionString); 2639 return JNI_EINVAL; 2640 } else { 2641 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2642 } 2643 // -Xss 2644 } else if (match_option(option, "-Xss", &tail)) { 2645 julong long_ThreadStackSize = 0; 2646 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2647 if (errcode != arg_in_range) { 2648 jio_fprintf(defaultStream::error_stream(), 2649 "Invalid thread stack size: %s\n", option->optionString); 2650 describe_range_error(errcode); 2651 return JNI_EINVAL; 2652 } 2653 // Internally track ThreadStackSize in units of 1024 bytes. 2654 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2655 round_to((int)long_ThreadStackSize, K) / K); 2656 // -Xoss 2657 } else if (match_option(option, "-Xoss", &tail)) { 2658 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2659 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2660 julong long_CodeCacheExpansionSize = 0; 2661 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2662 if (errcode != arg_in_range) { 2663 jio_fprintf(defaultStream::error_stream(), 2664 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2665 os::vm_page_size()/K); 2666 return JNI_EINVAL; 2667 } 2668 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2669 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2670 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2671 julong long_ReservedCodeCacheSize = 0; 2672 2673 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2674 if (errcode != arg_in_range) { 2675 jio_fprintf(defaultStream::error_stream(), 2676 "Invalid maximum code cache size: %s.\n", option->optionString); 2677 return JNI_EINVAL; 2678 } 2679 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2680 //-XX:IncreaseFirstTierCompileThresholdAt= 2681 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2682 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2683 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2684 jio_fprintf(defaultStream::error_stream(), 2685 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2686 option->optionString); 2687 return JNI_EINVAL; 2688 } 2689 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2690 // -green 2691 } else if (match_option(option, "-green", &tail)) { 2692 jio_fprintf(defaultStream::error_stream(), 2693 "Green threads support not available\n"); 2694 return JNI_EINVAL; 2695 // -native 2696 } else if (match_option(option, "-native", &tail)) { 2697 // HotSpot always uses native threads, ignore silently for compatibility 2698 // -Xsqnopause 2699 } else if (match_option(option, "-Xsqnopause", &tail)) { 2700 // EVM option, ignore silently for compatibility 2701 // -Xrs 2702 } else if (match_option(option, "-Xrs", &tail)) { 2703 // Classic/EVM option, new functionality 2704 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2705 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2706 // change default internal VM signals used - lower case for back compat 2707 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2708 // -Xoptimize 2709 } else if (match_option(option, "-Xoptimize", &tail)) { 2710 // EVM option, ignore silently for compatibility 2711 // -Xprof 2712 } else if (match_option(option, "-Xprof", &tail)) { 2713#if INCLUDE_FPROF 2714 _has_profile = true; 2715#else // INCLUDE_FPROF 2716 jio_fprintf(defaultStream::error_stream(), 2717 "Flat profiling is not supported in this VM.\n"); 2718 return JNI_ERR; 2719#endif // INCLUDE_FPROF 2720 // -Xconcurrentio 2721 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2722 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2723 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2724 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2725 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2726 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2727 2728 // -Xinternalversion 2729 } else if (match_option(option, "-Xinternalversion", &tail)) { 2730 jio_fprintf(defaultStream::output_stream(), "%s\n", 2731 VM_Version::internal_vm_info_string()); 2732 vm_exit(0); 2733#ifndef PRODUCT 2734 // -Xprintflags 2735 } else if (match_option(option, "-Xprintflags", &tail)) { 2736 CommandLineFlags::printFlags(tty, false); 2737 vm_exit(0); 2738#endif 2739 // -D 2740 } else if (match_option(option, "-D", &tail)) { 2741 if (!add_property(tail)) { 2742 return JNI_ENOMEM; 2743 } 2744 // Out of the box management support 2745 if (match_option(option, "-Dcom.sun.management", &tail)) { 2746#if INCLUDE_MANAGEMENT 2747 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2748#else 2749 jio_fprintf(defaultStream::output_stream(), 2750 "-Dcom.sun.management is not supported in this VM.\n"); 2751 return JNI_ERR; 2752#endif 2753 } 2754 // -Xint 2755 } else if (match_option(option, "-Xint", &tail)) { 2756 set_mode_flags(_int); 2757 // -Xmixed 2758 } else if (match_option(option, "-Xmixed", &tail)) { 2759 set_mode_flags(_mixed); 2760 // -Xcomp 2761 } else if (match_option(option, "-Xcomp", &tail)) { 2762 // for testing the compiler; turn off all flags that inhibit compilation 2763 set_mode_flags(_comp); 2764 // -Xshare:dump 2765 } else if (match_option(option, "-Xshare:dump", &tail)) { 2766 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2767 set_mode_flags(_int); // Prevent compilation, which creates objects 2768 // -Xshare:on 2769 } else if (match_option(option, "-Xshare:on", &tail)) { 2770 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2771 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2772 // -Xshare:auto 2773 } else if (match_option(option, "-Xshare:auto", &tail)) { 2774 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2775 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2776 // -Xshare:off 2777 } else if (match_option(option, "-Xshare:off", &tail)) { 2778 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2779 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2780 // -Xverify 2781 } else if (match_option(option, "-Xverify", &tail)) { 2782 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2783 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2784 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2785 } else if (strcmp(tail, ":remote") == 0) { 2786 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2787 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2788 } else if (strcmp(tail, ":none") == 0) { 2789 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2790 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2791 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2792 return JNI_EINVAL; 2793 } 2794 // -Xdebug 2795 } else if (match_option(option, "-Xdebug", &tail)) { 2796 // note this flag has been used, then ignore 2797 set_xdebug_mode(true); 2798 // -Xnoagent 2799 } else if (match_option(option, "-Xnoagent", &tail)) { 2800 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2801 } else if (match_option(option, "-Xboundthreads", &tail)) { 2802 // Bind user level threads to kernel threads (Solaris only) 2803 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2804 } else if (match_option(option, "-Xloggc:", &tail)) { 2805 // Redirect GC output to the file. -Xloggc:<filename> 2806 // ostream_init_log(), when called will use this filename 2807 // to initialize a fileStream. 2808 _gc_log_filename = strdup(tail); 2809 FLAG_SET_CMDLINE(bool, PrintGC, true); 2810 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2811 2812 // JNI hooks 2813 } else if (match_option(option, "-Xcheck", &tail)) { 2814 if (!strcmp(tail, ":jni")) { 2815#if !INCLUDE_JNI_CHECK 2816 warning("JNI CHECKING is not supported in this VM"); 2817#else 2818 CheckJNICalls = true; 2819#endif // INCLUDE_JNI_CHECK 2820 } else if (is_bad_option(option, args->ignoreUnrecognized, 2821 "check")) { 2822 return JNI_EINVAL; 2823 } 2824 } else if (match_option(option, "vfprintf", &tail)) { 2825 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2826 } else if (match_option(option, "exit", &tail)) { 2827 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2828 } else if (match_option(option, "abort", &tail)) { 2829 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2830 // -XX:+AggressiveHeap 2831 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2832 2833 // This option inspects the machine and attempts to set various 2834 // parameters to be optimal for long-running, memory allocation 2835 // intensive jobs. It is intended for machines with large 2836 // amounts of cpu and memory. 2837 2838 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2839 // VM, but we may not be able to represent the total physical memory 2840 // available (like having 8gb of memory on a box but using a 32bit VM). 2841 // Thus, we need to make sure we're using a julong for intermediate 2842 // calculations. 2843 julong initHeapSize; 2844 julong total_memory = os::physical_memory(); 2845 2846 if (total_memory < (julong)256*M) { 2847 jio_fprintf(defaultStream::error_stream(), 2848 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2849 vm_exit(1); 2850 } 2851 2852 // The heap size is half of available memory, or (at most) 2853 // all of possible memory less 160mb (leaving room for the OS 2854 // when using ISM). This is the maximum; because adaptive sizing 2855 // is turned on below, the actual space used may be smaller. 2856 2857 initHeapSize = MIN2(total_memory / (julong)2, 2858 total_memory - (julong)160*M); 2859 2860 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2861 2862 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2863 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2864 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2865 // Currently the minimum size and the initial heap sizes are the same. 2866 set_min_heap_size(initHeapSize); 2867 } 2868 if (FLAG_IS_DEFAULT(NewSize)) { 2869 // Make the young generation 3/8ths of the total heap. 2870 FLAG_SET_CMDLINE(uintx, NewSize, 2871 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2872 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2873 } 2874 2875#ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 2876 FLAG_SET_DEFAULT(UseLargePages, true); 2877#endif 2878 2879 // Increase some data structure sizes for efficiency 2880 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2881 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2882 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2883 2884 // See the OldPLABSize comment below, but replace 'after promotion' 2885 // with 'after copying'. YoungPLABSize is the size of the survivor 2886 // space per-gc-thread buffers. The default is 4kw. 2887 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2888 2889 // OldPLABSize is the size of the buffers in the old gen that 2890 // UseParallelGC uses to promote live data that doesn't fit in the 2891 // survivor spaces. At any given time, there's one for each gc thread. 2892 // The default size is 1kw. These buffers are rarely used, since the 2893 // survivor spaces are usually big enough. For specjbb, however, there 2894 // are occasions when there's lots of live data in the young gen 2895 // and we end up promoting some of it. We don't have a definite 2896 // explanation for why bumping OldPLABSize helps, but the theory 2897 // is that a bigger PLAB results in retaining something like the 2898 // original allocation order after promotion, which improves mutator 2899 // locality. A minor effect may be that larger PLABs reduce the 2900 // number of PLAB allocation events during gc. The value of 8kw 2901 // was arrived at by experimenting with specjbb. 2902 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2903 2904 // Enable parallel GC and adaptive generation sizing 2905 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2906 FLAG_SET_DEFAULT(ParallelGCThreads, 2907 Abstract_VM_Version::parallel_worker_threads()); 2908 2909 // Encourage steady state memory management 2910 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2911 2912 // This appears to improve mutator locality 2913 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2914 2915 // Get around early Solaris scheduling bug 2916 // (affinity vs other jobs on system) 2917 // but disallow DR and offlining (5008695). 2918 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 2919 2920 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 2921 // The last option must always win. 2922 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 2923 FLAG_SET_CMDLINE(bool, NeverTenure, true); 2924 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 2925 // The last option must always win. 2926 FLAG_SET_CMDLINE(bool, NeverTenure, false); 2927 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 2928 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 2929 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 2930 jio_fprintf(defaultStream::error_stream(), 2931 "Please use CMSClassUnloadingEnabled in place of " 2932 "CMSPermGenSweepingEnabled in the future\n"); 2933 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 2934 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 2935 jio_fprintf(defaultStream::error_stream(), 2936 "Please use -XX:+UseGCOverheadLimit in place of " 2937 "-XX:+UseGCTimeLimit in the future\n"); 2938 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 2939 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 2940 jio_fprintf(defaultStream::error_stream(), 2941 "Please use -XX:-UseGCOverheadLimit in place of " 2942 "-XX:-UseGCTimeLimit in the future\n"); 2943 // The TLE options are for compatibility with 1.3 and will be 2944 // removed without notice in a future release. These options 2945 // are not to be documented. 2946 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 2947 // No longer used. 2948 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 2949 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 2950 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 2951 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2952 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 2953 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 2954 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 2955 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 2956 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 2957 // No longer used. 2958 } else if (match_option(option, "-XX:TLESize=", &tail)) { 2959 julong long_tlab_size = 0; 2960 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 2961 if (errcode != arg_in_range) { 2962 jio_fprintf(defaultStream::error_stream(), 2963 "Invalid TLAB size: %s\n", option->optionString); 2964 describe_range_error(errcode); 2965 return JNI_EINVAL; 2966 } 2967 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 2968 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 2969 // No longer used. 2970 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 2971 FLAG_SET_CMDLINE(bool, UseTLAB, true); 2972 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 2973 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2974 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 2975 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 2976 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 2977 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 2978 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 2979 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 2980 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 2981#if defined(DTRACE_ENABLED) 2982 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 2983 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 2984 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 2985 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 2986#else // defined(DTRACE_ENABLED) 2987 jio_fprintf(defaultStream::error_stream(), 2988 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 2989 return JNI_EINVAL; 2990#endif // defined(DTRACE_ENABLED) 2991#ifdef ASSERT 2992 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 2993 FLAG_SET_CMDLINE(bool, FullGCALot, true); 2994 // disable scavenge before parallel mark-compact 2995 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2996#endif 2997 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 2998 julong cms_blocks_to_claim = (julong)atol(tail); 2999 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3000 jio_fprintf(defaultStream::error_stream(), 3001 "Please use -XX:OldPLABSize in place of " 3002 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 3003 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 3004 julong cms_blocks_to_claim = (julong)atol(tail); 3005 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3006 jio_fprintf(defaultStream::error_stream(), 3007 "Please use -XX:OldPLABSize in place of " 3008 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 3009 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 3010 julong old_plab_size = 0; 3011 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 3012 if (errcode != arg_in_range) { 3013 jio_fprintf(defaultStream::error_stream(), 3014 "Invalid old PLAB size: %s\n", option->optionString); 3015 describe_range_error(errcode); 3016 return JNI_EINVAL; 3017 } 3018 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 3019 jio_fprintf(defaultStream::error_stream(), 3020 "Please use -XX:OldPLABSize in place of " 3021 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 3022 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 3023 julong young_plab_size = 0; 3024 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 3025 if (errcode != arg_in_range) { 3026 jio_fprintf(defaultStream::error_stream(), 3027 "Invalid young PLAB size: %s\n", option->optionString); 3028 describe_range_error(errcode); 3029 return JNI_EINVAL; 3030 } 3031 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 3032 jio_fprintf(defaultStream::error_stream(), 3033 "Please use -XX:YoungPLABSize in place of " 3034 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 3035 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3036 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3037 julong stack_size = 0; 3038 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3039 if (errcode != arg_in_range) { 3040 jio_fprintf(defaultStream::error_stream(), 3041 "Invalid mark stack size: %s\n", option->optionString); 3042 describe_range_error(errcode); 3043 return JNI_EINVAL; 3044 } 3045 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3046 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3047 julong max_stack_size = 0; 3048 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3049 if (errcode != arg_in_range) { 3050 jio_fprintf(defaultStream::error_stream(), 3051 "Invalid maximum mark stack size: %s\n", 3052 option->optionString); 3053 describe_range_error(errcode); 3054 return JNI_EINVAL; 3055 } 3056 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3057 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3058 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3059 uintx conc_threads = 0; 3060 if (!parse_uintx(tail, &conc_threads, 1)) { 3061 jio_fprintf(defaultStream::error_stream(), 3062 "Invalid concurrent threads: %s\n", option->optionString); 3063 return JNI_EINVAL; 3064 } 3065 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3066 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3067 julong max_direct_memory_size = 0; 3068 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3069 if (errcode != arg_in_range) { 3070 jio_fprintf(defaultStream::error_stream(), 3071 "Invalid maximum direct memory size: %s\n", 3072 option->optionString); 3073 describe_range_error(errcode); 3074 return JNI_EINVAL; 3075 } 3076 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3077 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) { 3078 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go 3079 // away and will cause VM initialization failures! 3080 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release."); 3081 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true); 3082#if !INCLUDE_MANAGEMENT 3083 } else if (match_option(option, "-XX:+ManagementServer", &tail)) { 3084 jio_fprintf(defaultStream::error_stream(), 3085 "ManagementServer is not supported in this VM.\n"); 3086 return JNI_ERR; 3087#endif // INCLUDE_MANAGEMENT 3088 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3089 // Skip -XX:Flags= since that case has already been handled 3090 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3091 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3092 return JNI_EINVAL; 3093 } 3094 } 3095 // Unknown option 3096 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3097 return JNI_ERR; 3098 } 3099 } 3100 3101 // Change the default value for flags which have different default values 3102 // when working with older JDKs. 3103#ifdef LINUX 3104 if (JDK_Version::current().compare_major(6) <= 0 && 3105 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3106 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3107 } 3108#endif // LINUX 3109 return JNI_OK; 3110} 3111 3112jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3113 // This must be done after all -D arguments have been processed. 3114 scp_p->expand_endorsed(); 3115 3116 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 3117 // Assemble the bootclasspath elements into the final path. 3118 Arguments::set_sysclasspath(scp_p->combined_path()); 3119 } 3120 3121 // This must be done after all arguments have been processed. 3122 // java_compiler() true means set to "NONE" or empty. 3123 if (java_compiler() && !xdebug_mode()) { 3124 // For backwards compatibility, we switch to interpreted mode if 3125 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3126 // not specified. 3127 set_mode_flags(_int); 3128 } 3129 if (CompileThreshold == 0) { 3130 set_mode_flags(_int); 3131 } 3132 3133 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3134 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3135 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3136 } 3137 3138#ifndef COMPILER2 3139 // Don't degrade server performance for footprint 3140 if (FLAG_IS_DEFAULT(UseLargePages) && 3141 MaxHeapSize < LargePageHeapSizeThreshold) { 3142 // No need for large granularity pages w/small heaps. 3143 // Note that large pages are enabled/disabled for both the 3144 // Java heap and the code cache. 3145 FLAG_SET_DEFAULT(UseLargePages, false); 3146 } 3147 3148#else 3149 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3150 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3151 } 3152#endif 3153 3154#ifndef TIERED 3155 // Tiered compilation is undefined. 3156 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3157#endif 3158 3159 // If we are running in a headless jre, force java.awt.headless property 3160 // to be true unless the property has already been set. 3161 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3162 if (os::is_headless_jre()) { 3163 const char* headless = Arguments::get_property("java.awt.headless"); 3164 if (headless == NULL) { 3165 char envbuffer[128]; 3166 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3167 if (!add_property("java.awt.headless=true")) { 3168 return JNI_ENOMEM; 3169 } 3170 } else { 3171 char buffer[256]; 3172 strcpy(buffer, "java.awt.headless="); 3173 strcat(buffer, envbuffer); 3174 if (!add_property(buffer)) { 3175 return JNI_ENOMEM; 3176 } 3177 } 3178 } 3179 } 3180 3181 if (!check_vm_args_consistency()) { 3182 return JNI_ERR; 3183 } 3184 3185 return JNI_OK; 3186} 3187 3188jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3189 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3190 scp_assembly_required_p); 3191} 3192 3193jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3194 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3195 scp_assembly_required_p); 3196} 3197 3198jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3199 const int N_MAX_OPTIONS = 64; 3200 const int OPTION_BUFFER_SIZE = 1024; 3201 char buffer[OPTION_BUFFER_SIZE]; 3202 3203 // The variable will be ignored if it exceeds the length of the buffer. 3204 // Don't check this variable if user has special privileges 3205 // (e.g. unix su command). 3206 if (os::getenv(name, buffer, sizeof(buffer)) && 3207 !os::have_special_privileges()) { 3208 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3209 jio_fprintf(defaultStream::error_stream(), 3210 "Picked up %s: %s\n", name, buffer); 3211 char* rd = buffer; // pointer to the input string (rd) 3212 int i; 3213 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3214 while (isspace(*rd)) rd++; // skip whitespace 3215 if (*rd == 0) break; // we re done when the input string is read completely 3216 3217 // The output, option string, overwrites the input string. 3218 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3219 // input string (rd). 3220 char* wrt = rd; 3221 3222 options[i++].optionString = wrt; // Fill in option 3223 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3224 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3225 int quote = *rd; // matching quote to look for 3226 rd++; // don't copy open quote 3227 while (*rd != quote) { // include everything (even spaces) up until quote 3228 if (*rd == 0) { // string termination means unmatched string 3229 jio_fprintf(defaultStream::error_stream(), 3230 "Unmatched quote in %s\n", name); 3231 return JNI_ERR; 3232 } 3233 *wrt++ = *rd++; // copy to option string 3234 } 3235 rd++; // don't copy close quote 3236 } else { 3237 *wrt++ = *rd++; // copy to option string 3238 } 3239 } 3240 // Need to check if we're done before writing a NULL, 3241 // because the write could be to the byte that rd is pointing to. 3242 if (*rd++ == 0) { 3243 *wrt = 0; 3244 break; 3245 } 3246 *wrt = 0; // Zero terminate option 3247 } 3248 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3249 JavaVMInitArgs vm_args; 3250 vm_args.version = JNI_VERSION_1_2; 3251 vm_args.options = options; 3252 vm_args.nOptions = i; 3253 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3254 3255 if (PrintVMOptions) { 3256 const char* tail; 3257 for (int i = 0; i < vm_args.nOptions; i++) { 3258 const JavaVMOption *option = vm_args.options + i; 3259 if (match_option(option, "-XX:", &tail)) { 3260 logOption(tail); 3261 } 3262 } 3263 } 3264 3265 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR)); 3266 } 3267 return JNI_OK; 3268} 3269 3270void Arguments::set_shared_spaces_flags() { 3271 if (DumpSharedSpaces) { 3272 if (RequireSharedSpaces) { 3273 warning("cannot dump shared archive while using shared archive"); 3274 } 3275 UseSharedSpaces = false; 3276#ifdef _LP64 3277 if (!UseCompressedOops || !UseCompressedKlassPointers) { 3278 vm_exit_during_initialization( 3279 "Cannot dump shared archive when UseCompressedOops or UseCompressedKlassPointers is off.", NULL); 3280 } 3281 } else { 3282 // UseCompressedOops and UseCompressedKlassPointers must be on for UseSharedSpaces. 3283 if (!UseCompressedOops || !UseCompressedKlassPointers) { 3284 no_shared_spaces(); 3285 } 3286#endif 3287 } 3288} 3289 3290#if !INCLUDE_ALL_GCS 3291static void force_serial_gc() { 3292 FLAG_SET_DEFAULT(UseSerialGC, true); 3293 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 3294 UNSUPPORTED_GC_OPTION(UseG1GC); 3295 UNSUPPORTED_GC_OPTION(UseParallelGC); 3296 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3297 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3298 UNSUPPORTED_GC_OPTION(UseParNewGC); 3299} 3300#endif // INCLUDE_ALL_GCS 3301 3302// Sharing support 3303// Construct the path to the archive 3304static char* get_shared_archive_path() { 3305 char *shared_archive_path; 3306 if (SharedArchiveFile == NULL) { 3307 char jvm_path[JVM_MAXPATHLEN]; 3308 os::jvm_path(jvm_path, sizeof(jvm_path)); 3309 char *end = strrchr(jvm_path, *os::file_separator()); 3310 if (end != NULL) *end = '\0'; 3311 size_t jvm_path_len = strlen(jvm_path); 3312 size_t file_sep_len = strlen(os::file_separator()); 3313 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3314 file_sep_len + 20, mtInternal); 3315 if (shared_archive_path != NULL) { 3316 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3317 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3318 strncat(shared_archive_path, "classes.jsa", 11); 3319 } 3320 } else { 3321 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3322 if (shared_archive_path != NULL) { 3323 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3324 } 3325 } 3326 return shared_archive_path; 3327} 3328 3329// Parse entry point called from JNI_CreateJavaVM 3330 3331jint Arguments::parse(const JavaVMInitArgs* args) { 3332 3333 // Remaining part of option string 3334 const char* tail; 3335 3336 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3337 const char* hotspotrc = ".hotspotrc"; 3338 bool settings_file_specified = false; 3339 bool needs_hotspotrc_warning = false; 3340 3341 const char* flags_file; 3342 int index; 3343 for (index = 0; index < args->nOptions; index++) { 3344 const JavaVMOption *option = args->options + index; 3345 if (match_option(option, "-XX:Flags=", &tail)) { 3346 flags_file = tail; 3347 settings_file_specified = true; 3348 } 3349 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3350 PrintVMOptions = true; 3351 } 3352 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3353 PrintVMOptions = false; 3354 } 3355 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3356 IgnoreUnrecognizedVMOptions = true; 3357 } 3358 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3359 IgnoreUnrecognizedVMOptions = false; 3360 } 3361 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3362 CommandLineFlags::printFlags(tty, false); 3363 vm_exit(0); 3364 } 3365 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3366#if INCLUDE_NMT 3367 MemTracker::init_tracking_options(tail); 3368#else 3369 jio_fprintf(defaultStream::error_stream(), 3370 "Native Memory Tracking is not supported in this VM\n"); 3371 return JNI_ERR; 3372#endif 3373 } 3374 3375 3376#ifndef PRODUCT 3377 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3378 CommandLineFlags::printFlags(tty, true); 3379 vm_exit(0); 3380 } 3381#endif 3382 } 3383 3384 if (IgnoreUnrecognizedVMOptions) { 3385 // uncast const to modify the flag args->ignoreUnrecognized 3386 *(jboolean*)(&args->ignoreUnrecognized) = true; 3387 } 3388 3389 // Parse specified settings file 3390 if (settings_file_specified) { 3391 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3392 return JNI_EINVAL; 3393 } 3394 } else { 3395#ifdef ASSERT 3396 // Parse default .hotspotrc settings file 3397 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3398 return JNI_EINVAL; 3399 } 3400#else 3401 struct stat buf; 3402 if (os::stat(hotspotrc, &buf) == 0) { 3403 needs_hotspotrc_warning = true; 3404 } 3405#endif 3406 } 3407 3408 if (PrintVMOptions) { 3409 for (index = 0; index < args->nOptions; index++) { 3410 const JavaVMOption *option = args->options + index; 3411 if (match_option(option, "-XX:", &tail)) { 3412 logOption(tail); 3413 } 3414 } 3415 } 3416 3417 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3418 jint result = parse_vm_init_args(args); 3419 if (result != JNI_OK) { 3420 return result; 3421 } 3422 3423 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3424 SharedArchivePath = get_shared_archive_path(); 3425 if (SharedArchivePath == NULL) { 3426 return JNI_ENOMEM; 3427 } 3428 3429 // Delay warning until here so that we've had a chance to process 3430 // the -XX:-PrintWarnings flag 3431 if (needs_hotspotrc_warning) { 3432 warning("%s file is present but has been ignored. " 3433 "Run with -XX:Flags=%s to load the file.", 3434 hotspotrc, hotspotrc); 3435 } 3436 3437#ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3438 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3439#endif 3440 3441#if INCLUDE_ALL_GCS 3442 #if (defined JAVASE_EMBEDDED || defined ARM) 3443 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3444 #endif 3445#endif 3446 3447#ifndef PRODUCT 3448 if (TraceBytecodesAt != 0) { 3449 TraceBytecodes = true; 3450 } 3451 if (CountCompiledCalls) { 3452 if (UseCounterDecay) { 3453 warning("UseCounterDecay disabled because CountCalls is set"); 3454 UseCounterDecay = false; 3455 } 3456 } 3457#endif // PRODUCT 3458 3459 // JSR 292 is not supported before 1.7 3460 if (!JDK_Version::is_gte_jdk17x_version()) { 3461 if (EnableInvokeDynamic) { 3462 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3463 warning("JSR 292 is not supported before 1.7. Disabling support."); 3464 } 3465 EnableInvokeDynamic = false; 3466 } 3467 } 3468 3469 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 3470 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3471 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 3472 } 3473 ScavengeRootsInCode = 1; 3474 } 3475 3476 if (PrintGCDetails) { 3477 // Turn on -verbose:gc options as well 3478 PrintGC = true; 3479 } 3480 3481 if (!JDK_Version::is_gte_jdk18x_version()) { 3482 // To avoid changing the log format for 7 updates this flag is only 3483 // true by default in JDK8 and above. 3484 if (FLAG_IS_DEFAULT(PrintGCCause)) { 3485 FLAG_SET_DEFAULT(PrintGCCause, false); 3486 } 3487 } 3488 3489 // Set object alignment values. 3490 set_object_alignment(); 3491 3492#if !INCLUDE_ALL_GCS 3493 force_serial_gc(); 3494#endif // INCLUDE_ALL_GCS 3495#if !INCLUDE_CDS 3496 if (DumpSharedSpaces || RequireSharedSpaces) { 3497 jio_fprintf(defaultStream::error_stream(), 3498 "Shared spaces are not supported in this VM\n"); 3499 return JNI_ERR; 3500 } 3501 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3502 warning("Shared spaces are not supported in this VM"); 3503 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3504 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3505 } 3506 no_shared_spaces(); 3507#endif // INCLUDE_CDS 3508 3509 // Set flags based on ergonomics. 3510 set_ergonomics_flags(); 3511 3512 set_shared_spaces_flags(); 3513 3514 // Check the GC selections again. 3515 if (!check_gc_consistency()) { 3516 return JNI_EINVAL; 3517 } 3518 3519 if (TieredCompilation) { 3520 set_tiered_flags(); 3521 } else { 3522 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3523 if (CompilationPolicyChoice >= 2) { 3524 vm_exit_during_initialization( 3525 "Incompatible compilation policy selected", NULL); 3526 } 3527 } 3528 3529 // Set heap size based on available physical memory 3530 set_heap_size(); 3531 3532#if INCLUDE_ALL_GCS 3533 // Set per-collector flags 3534 if (UseParallelGC || UseParallelOldGC) { 3535 set_parallel_gc_flags(); 3536 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below 3537 set_cms_and_parnew_gc_flags(); 3538 } else if (UseParNewGC) { // skipped if CMS is set above 3539 set_parnew_gc_flags(); 3540 } else if (UseG1GC) { 3541 set_g1_gc_flags(); 3542 } 3543 check_deprecated_gcs(); 3544 check_deprecated_gc_flags(); 3545 if (AssumeMP && !UseSerialGC) { 3546 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 3547 warning("If the number of processors is expected to increase from one, then" 3548 " you should configure the number of parallel GC threads appropriately" 3549 " using -XX:ParallelGCThreads=N"); 3550 } 3551 } 3552#else // INCLUDE_ALL_GCS 3553 assert(verify_serial_gc_flags(), "SerialGC unset"); 3554#endif // INCLUDE_ALL_GCS 3555 3556 // Set bytecode rewriting flags 3557 set_bytecode_flags(); 3558 3559 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 3560 set_aggressive_opts_flags(); 3561 3562 // Turn off biased locking for locking debug mode flags, 3563 // which are subtlely different from each other but neither works with 3564 // biased locking. 3565 if (UseHeavyMonitors 3566#ifdef COMPILER1 3567 || !UseFastLocking 3568#endif // COMPILER1 3569 ) { 3570 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3571 // flag set to true on command line; warn the user that they 3572 // can't enable biased locking here 3573 warning("Biased Locking is not supported with locking debug flags" 3574 "; ignoring UseBiasedLocking flag." ); 3575 } 3576 UseBiasedLocking = false; 3577 } 3578 3579#ifdef CC_INTERP 3580 // Clear flags not supported by the C++ interpreter 3581 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3582 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3583 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3584 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false)); 3585#endif // CC_INTERP 3586 3587#ifdef COMPILER2 3588 if (!UseBiasedLocking || EmitSync != 0) { 3589 UseOptoBiasInlining = false; 3590 } 3591 if (!EliminateLocks) { 3592 EliminateNestedLocks = false; 3593 } 3594 if (!Inline) { 3595 IncrementalInline = false; 3596 } 3597#ifndef PRODUCT 3598 if (!IncrementalInline) { 3599 AlwaysIncrementalInline = false; 3600 } 3601#endif 3602 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) { 3603 // incremental inlining: bump MaxNodeLimit 3604 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000); 3605 } 3606#endif 3607 3608 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3609 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3610 DebugNonSafepoints = true; 3611 } 3612 3613#ifndef PRODUCT 3614 if (CompileTheWorld) { 3615 // Force NmethodSweeper to sweep whole CodeCache each time. 3616 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3617 NmethodSweepFraction = 1; 3618 } 3619 } 3620#endif 3621 3622 if (PrintCommandLineFlags) { 3623 CommandLineFlags::printSetFlags(tty); 3624 } 3625 3626 // Apply CPU specific policy for the BiasedLocking 3627 if (UseBiasedLocking) { 3628 if (!VM_Version::use_biased_locking() && 3629 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3630 UseBiasedLocking = false; 3631 } 3632 } 3633 3634 // set PauseAtExit if the gamma launcher was used and a debugger is attached 3635 // but only if not already set on the commandline 3636 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) { 3637 bool set = false; 3638 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set); 3639 if (!set) { 3640 FLAG_SET_DEFAULT(PauseAtExit, true); 3641 } 3642 } 3643 3644 return JNI_OK; 3645} 3646 3647jint Arguments::adjust_after_os() { 3648#if INCLUDE_ALL_GCS 3649 if (UseParallelGC || UseParallelOldGC) { 3650 if (UseNUMA) { 3651 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3652 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3653 } 3654 // For those collectors or operating systems (eg, Windows) that do 3655 // not support full UseNUMA, we will map to UseNUMAInterleaving for now 3656 UseNUMAInterleaving = true; 3657 } 3658 } 3659#endif // INCLUDE_ALL_GCS 3660 return JNI_OK; 3661} 3662 3663int Arguments::PropertyList_count(SystemProperty* pl) { 3664 int count = 0; 3665 while(pl != NULL) { 3666 count++; 3667 pl = pl->next(); 3668 } 3669 return count; 3670} 3671 3672const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3673 assert(key != NULL, "just checking"); 3674 SystemProperty* prop; 3675 for (prop = pl; prop != NULL; prop = prop->next()) { 3676 if (strcmp(key, prop->key()) == 0) return prop->value(); 3677 } 3678 return NULL; 3679} 3680 3681const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3682 int count = 0; 3683 const char* ret_val = NULL; 3684 3685 while(pl != NULL) { 3686 if(count >= index) { 3687 ret_val = pl->key(); 3688 break; 3689 } 3690 count++; 3691 pl = pl->next(); 3692 } 3693 3694 return ret_val; 3695} 3696 3697char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3698 int count = 0; 3699 char* ret_val = NULL; 3700 3701 while(pl != NULL) { 3702 if(count >= index) { 3703 ret_val = pl->value(); 3704 break; 3705 } 3706 count++; 3707 pl = pl->next(); 3708 } 3709 3710 return ret_val; 3711} 3712 3713void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3714 SystemProperty* p = *plist; 3715 if (p == NULL) { 3716 *plist = new_p; 3717 } else { 3718 while (p->next() != NULL) { 3719 p = p->next(); 3720 } 3721 p->set_next(new_p); 3722 } 3723} 3724 3725void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3726 if (plist == NULL) 3727 return; 3728 3729 SystemProperty* new_p = new SystemProperty(k, v, true); 3730 PropertyList_add(plist, new_p); 3731} 3732 3733// This add maintains unique property key in the list. 3734void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3735 if (plist == NULL) 3736 return; 3737 3738 // If property key exist then update with new value. 3739 SystemProperty* prop; 3740 for (prop = *plist; prop != NULL; prop = prop->next()) { 3741 if (strcmp(k, prop->key()) == 0) { 3742 if (append) { 3743 prop->append_value(v); 3744 } else { 3745 prop->set_value(v); 3746 } 3747 return; 3748 } 3749 } 3750 3751 PropertyList_add(plist, k, v); 3752} 3753 3754// Copies src into buf, replacing "%%" with "%" and "%p" with pid 3755// Returns true if all of the source pointed by src has been copied over to 3756// the destination buffer pointed by buf. Otherwise, returns false. 3757// Notes: 3758// 1. If the length (buflen) of the destination buffer excluding the 3759// NULL terminator character is not long enough for holding the expanded 3760// pid characters, it also returns false instead of returning the partially 3761// expanded one. 3762// 2. The passed in "buflen" should be large enough to hold the null terminator. 3763bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3764 char* buf, size_t buflen) { 3765 const char* p = src; 3766 char* b = buf; 3767 const char* src_end = &src[srclen]; 3768 char* buf_end = &buf[buflen - 1]; 3769 3770 while (p < src_end && b < buf_end) { 3771 if (*p == '%') { 3772 switch (*(++p)) { 3773 case '%': // "%%" ==> "%" 3774 *b++ = *p++; 3775 break; 3776 case 'p': { // "%p" ==> current process id 3777 // buf_end points to the character before the last character so 3778 // that we could write '\0' to the end of the buffer. 3779 size_t buf_sz = buf_end - b + 1; 3780 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3781 3782 // if jio_snprintf fails or the buffer is not long enough to hold 3783 // the expanded pid, returns false. 3784 if (ret < 0 || ret >= (int)buf_sz) { 3785 return false; 3786 } else { 3787 b += ret; 3788 assert(*b == '\0', "fail in copy_expand_pid"); 3789 if (p == src_end && b == buf_end + 1) { 3790 // reach the end of the buffer. 3791 return true; 3792 } 3793 } 3794 p++; 3795 break; 3796 } 3797 default : 3798 *b++ = '%'; 3799 } 3800 } else { 3801 *b++ = *p++; 3802 } 3803 } 3804 *b = '\0'; 3805 return (p == src_end); // return false if not all of the source was copied 3806} 3807