arguments.cpp revision 4419:754c24457b20
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 63char** Arguments::_jvm_flags_array = NULL; 64int Arguments::_num_jvm_flags = 0; 65char** Arguments::_jvm_args_array = NULL; 66int Arguments::_num_jvm_args = 0; 67char* Arguments::_java_command = NULL; 68SystemProperty* Arguments::_system_properties = NULL; 69const char* Arguments::_gc_log_filename = NULL; 70bool Arguments::_has_profile = false; 71bool Arguments::_has_alloc_profile = false; 72uintx Arguments::_min_heap_size = 0; 73Arguments::Mode Arguments::_mode = _mixed; 74bool Arguments::_java_compiler = false; 75bool Arguments::_xdebug_mode = false; 76const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 77const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 78int Arguments::_sun_java_launcher_pid = -1; 79bool Arguments::_created_by_gamma_launcher = false; 80 81// These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 82bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 83bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 84bool Arguments::_BackgroundCompilation = BackgroundCompilation; 85bool Arguments::_ClipInlining = ClipInlining; 86 87char* Arguments::SharedArchivePath = NULL; 88 89AgentLibraryList Arguments::_libraryList; 90AgentLibraryList Arguments::_agentList; 91 92abort_hook_t Arguments::_abort_hook = NULL; 93exit_hook_t Arguments::_exit_hook = NULL; 94vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 95 96 97SystemProperty *Arguments::_java_ext_dirs = NULL; 98SystemProperty *Arguments::_java_endorsed_dirs = NULL; 99SystemProperty *Arguments::_sun_boot_library_path = NULL; 100SystemProperty *Arguments::_java_library_path = NULL; 101SystemProperty *Arguments::_java_home = NULL; 102SystemProperty *Arguments::_java_class_path = NULL; 103SystemProperty *Arguments::_sun_boot_class_path = NULL; 104 105char* Arguments::_meta_index_path = NULL; 106char* Arguments::_meta_index_dir = NULL; 107 108// Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 109 110static bool match_option(const JavaVMOption *option, const char* name, 111 const char** tail) { 112 int len = (int)strlen(name); 113 if (strncmp(option->optionString, name, len) == 0) { 114 *tail = option->optionString + len; 115 return true; 116 } else { 117 return false; 118 } 119} 120 121static void logOption(const char* opt) { 122 if (PrintVMOptions) { 123 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 124 } 125} 126 127// Process java launcher properties. 128void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 129 // See if sun.java.launcher or sun.java.launcher.pid is defined. 130 // Must do this before setting up other system properties, 131 // as some of them may depend on launcher type. 132 for (int index = 0; index < args->nOptions; index++) { 133 const JavaVMOption* option = args->options + index; 134 const char* tail; 135 136 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 137 process_java_launcher_argument(tail, option->extraInfo); 138 continue; 139 } 140 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 141 _sun_java_launcher_pid = atoi(tail); 142 continue; 143 } 144 } 145} 146 147// Initialize system properties key and value. 148void Arguments::init_system_properties() { 149 150 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 151 "Java Virtual Machine Specification", false)); 152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 153 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 154 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 155 156 // following are JVMTI agent writeable properties. 157 // Properties values are set to NULL and they are 158 // os specific they are initialized in os::init_system_properties_values(). 159 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 160 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 161 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 162 _java_library_path = new SystemProperty("java.library.path", NULL, true); 163 _java_home = new SystemProperty("java.home", NULL, true); 164 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 165 166 _java_class_path = new SystemProperty("java.class.path", "", true); 167 168 // Add to System Property list. 169 PropertyList_add(&_system_properties, _java_ext_dirs); 170 PropertyList_add(&_system_properties, _java_endorsed_dirs); 171 PropertyList_add(&_system_properties, _sun_boot_library_path); 172 PropertyList_add(&_system_properties, _java_library_path); 173 PropertyList_add(&_system_properties, _java_home); 174 PropertyList_add(&_system_properties, _java_class_path); 175 PropertyList_add(&_system_properties, _sun_boot_class_path); 176 177 // Set OS specific system properties values 178 os::init_system_properties_values(); 179} 180 181 182 // Update/Initialize System properties after JDK version number is known 183void Arguments::init_version_specific_system_properties() { 184 enum { bufsz = 16 }; 185 char buffer[bufsz]; 186 const char* spec_vendor = "Sun Microsystems Inc."; 187 uint32_t spec_version = 0; 188 189 if (JDK_Version::is_gte_jdk17x_version()) { 190 spec_vendor = "Oracle Corporation"; 191 spec_version = JDK_Version::current().major_version(); 192 } 193 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 194 195 PropertyList_add(&_system_properties, 196 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 197 PropertyList_add(&_system_properties, 198 new SystemProperty("java.vm.specification.version", buffer, false)); 199 PropertyList_add(&_system_properties, 200 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 201} 202 203/** 204 * Provide a slightly more user-friendly way of eliminating -XX flags. 205 * When a flag is eliminated, it can be added to this list in order to 206 * continue accepting this flag on the command-line, while issuing a warning 207 * and ignoring the value. Once the JDK version reaches the 'accept_until' 208 * limit, we flatly refuse to admit the existence of the flag. This allows 209 * a flag to die correctly over JDK releases using HSX. 210 */ 211typedef struct { 212 const char* name; 213 JDK_Version obsoleted_in; // when the flag went away 214 JDK_Version accept_until; // which version to start denying the existence 215} ObsoleteFlag; 216 217static ObsoleteFlag obsolete_jvm_flags[] = { 218 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 219 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 220 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 221 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 222 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 223 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 224 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 225 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 226 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 227 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 228 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 229 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 230 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 231 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 232 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 233 { "DefaultInitialRAMFraction", 234 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 235 { "UseDepthFirstScavengeOrder", 236 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 237 { "HandlePromotionFailure", 238 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 239 { "MaxLiveObjectEvacuationRatio", 240 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 241 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 242 { "UseParallelOldGCCompacting", 243 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 244 { "UseParallelDensePrefixUpdate", 245 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 246 { "UseParallelOldGCDensePrefix", 247 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 248 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 249 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 250 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 251 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 252 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 253 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 254 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 255 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 256 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 257 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 258 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 259 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 260 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 261 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 262 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 263#ifdef PRODUCT 264 { "DesiredMethodLimit", 265 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 266#endif // PRODUCT 267 { NULL, JDK_Version(0), JDK_Version(0) } 268}; 269 270// Returns true if the flag is obsolete and fits into the range specified 271// for being ignored. In the case that the flag is ignored, the 'version' 272// value is filled in with the version number when the flag became 273// obsolete so that that value can be displayed to the user. 274bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 275 int i = 0; 276 assert(version != NULL, "Must provide a version buffer"); 277 while (obsolete_jvm_flags[i].name != NULL) { 278 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 279 // <flag>=xxx form 280 // [-|+]<flag> form 281 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 282 ((s[0] == '+' || s[0] == '-') && 283 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 284 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 285 *version = flag_status.obsoleted_in; 286 return true; 287 } 288 } 289 i++; 290 } 291 return false; 292} 293 294// Constructs the system class path (aka boot class path) from the following 295// components, in order: 296// 297// prefix // from -Xbootclasspath/p:... 298// endorsed // the expansion of -Djava.endorsed.dirs=... 299// base // from os::get_system_properties() or -Xbootclasspath= 300// suffix // from -Xbootclasspath/a:... 301// 302// java.endorsed.dirs is a list of directories; any jar or zip files in the 303// directories are added to the sysclasspath just before the base. 304// 305// This could be AllStatic, but it isn't needed after argument processing is 306// complete. 307class SysClassPath: public StackObj { 308public: 309 SysClassPath(const char* base); 310 ~SysClassPath(); 311 312 inline void set_base(const char* base); 313 inline void add_prefix(const char* prefix); 314 inline void add_suffix_to_prefix(const char* suffix); 315 inline void add_suffix(const char* suffix); 316 inline void reset_path(const char* base); 317 318 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 319 // property. Must be called after all command-line arguments have been 320 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 321 // combined_path(). 322 void expand_endorsed(); 323 324 inline const char* get_base() const { return _items[_scp_base]; } 325 inline const char* get_prefix() const { return _items[_scp_prefix]; } 326 inline const char* get_suffix() const { return _items[_scp_suffix]; } 327 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 328 329 // Combine all the components into a single c-heap-allocated string; caller 330 // must free the string if/when no longer needed. 331 char* combined_path(); 332 333private: 334 // Utility routines. 335 static char* add_to_path(const char* path, const char* str, bool prepend); 336 static char* add_jars_to_path(char* path, const char* directory); 337 338 inline void reset_item_at(int index); 339 340 // Array indices for the items that make up the sysclasspath. All except the 341 // base are allocated in the C heap and freed by this class. 342 enum { 343 _scp_prefix, // from -Xbootclasspath/p:... 344 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 345 _scp_base, // the default sysclasspath 346 _scp_suffix, // from -Xbootclasspath/a:... 347 _scp_nitems // the number of items, must be last. 348 }; 349 350 const char* _items[_scp_nitems]; 351 DEBUG_ONLY(bool _expansion_done;) 352}; 353 354SysClassPath::SysClassPath(const char* base) { 355 memset(_items, 0, sizeof(_items)); 356 _items[_scp_base] = base; 357 DEBUG_ONLY(_expansion_done = false;) 358} 359 360SysClassPath::~SysClassPath() { 361 // Free everything except the base. 362 for (int i = 0; i < _scp_nitems; ++i) { 363 if (i != _scp_base) reset_item_at(i); 364 } 365 DEBUG_ONLY(_expansion_done = false;) 366} 367 368inline void SysClassPath::set_base(const char* base) { 369 _items[_scp_base] = base; 370} 371 372inline void SysClassPath::add_prefix(const char* prefix) { 373 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 374} 375 376inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 377 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 378} 379 380inline void SysClassPath::add_suffix(const char* suffix) { 381 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 382} 383 384inline void SysClassPath::reset_item_at(int index) { 385 assert(index < _scp_nitems && index != _scp_base, "just checking"); 386 if (_items[index] != NULL) { 387 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 388 _items[index] = NULL; 389 } 390} 391 392inline void SysClassPath::reset_path(const char* base) { 393 // Clear the prefix and suffix. 394 reset_item_at(_scp_prefix); 395 reset_item_at(_scp_suffix); 396 set_base(base); 397} 398 399//------------------------------------------------------------------------------ 400 401void SysClassPath::expand_endorsed() { 402 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 403 404 const char* path = Arguments::get_property("java.endorsed.dirs"); 405 if (path == NULL) { 406 path = Arguments::get_endorsed_dir(); 407 assert(path != NULL, "no default for java.endorsed.dirs"); 408 } 409 410 char* expanded_path = NULL; 411 const char separator = *os::path_separator(); 412 const char* const end = path + strlen(path); 413 while (path < end) { 414 const char* tmp_end = strchr(path, separator); 415 if (tmp_end == NULL) { 416 expanded_path = add_jars_to_path(expanded_path, path); 417 path = end; 418 } else { 419 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 420 memcpy(dirpath, path, tmp_end - path); 421 dirpath[tmp_end - path] = '\0'; 422 expanded_path = add_jars_to_path(expanded_path, dirpath); 423 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 424 path = tmp_end + 1; 425 } 426 } 427 _items[_scp_endorsed] = expanded_path; 428 DEBUG_ONLY(_expansion_done = true;) 429} 430 431// Combine the bootclasspath elements, some of which may be null, into a single 432// c-heap-allocated string. 433char* SysClassPath::combined_path() { 434 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 435 assert(_expansion_done, "must call expand_endorsed() first."); 436 437 size_t lengths[_scp_nitems]; 438 size_t total_len = 0; 439 440 const char separator = *os::path_separator(); 441 442 // Get the lengths. 443 int i; 444 for (i = 0; i < _scp_nitems; ++i) { 445 if (_items[i] != NULL) { 446 lengths[i] = strlen(_items[i]); 447 // Include space for the separator char (or a NULL for the last item). 448 total_len += lengths[i] + 1; 449 } 450 } 451 assert(total_len > 0, "empty sysclasspath not allowed"); 452 453 // Copy the _items to a single string. 454 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 455 char* cp_tmp = cp; 456 for (i = 0; i < _scp_nitems; ++i) { 457 if (_items[i] != NULL) { 458 memcpy(cp_tmp, _items[i], lengths[i]); 459 cp_tmp += lengths[i]; 460 *cp_tmp++ = separator; 461 } 462 } 463 *--cp_tmp = '\0'; // Replace the extra separator. 464 return cp; 465} 466 467// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 468char* 469SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 470 char *cp; 471 472 assert(str != NULL, "just checking"); 473 if (path == NULL) { 474 size_t len = strlen(str) + 1; 475 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 476 memcpy(cp, str, len); // copy the trailing null 477 } else { 478 const char separator = *os::path_separator(); 479 size_t old_len = strlen(path); 480 size_t str_len = strlen(str); 481 size_t len = old_len + str_len + 2; 482 483 if (prepend) { 484 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 485 char* cp_tmp = cp; 486 memcpy(cp_tmp, str, str_len); 487 cp_tmp += str_len; 488 *cp_tmp = separator; 489 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 490 FREE_C_HEAP_ARRAY(char, path, mtInternal); 491 } else { 492 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 493 char* cp_tmp = cp + old_len; 494 *cp_tmp = separator; 495 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 496 } 497 } 498 return cp; 499} 500 501// Scan the directory and append any jar or zip files found to path. 502// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 503char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 504 DIR* dir = os::opendir(directory); 505 if (dir == NULL) return path; 506 507 char dir_sep[2] = { '\0', '\0' }; 508 size_t directory_len = strlen(directory); 509 const char fileSep = *os::file_separator(); 510 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 511 512 /* Scan the directory for jars/zips, appending them to path. */ 513 struct dirent *entry; 514 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 515 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 516 const char* name = entry->d_name; 517 const char* ext = name + strlen(name) - 4; 518 bool isJarOrZip = ext > name && 519 (os::file_name_strcmp(ext, ".jar") == 0 || 520 os::file_name_strcmp(ext, ".zip") == 0); 521 if (isJarOrZip) { 522 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 523 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 524 path = add_to_path(path, jarpath, false); 525 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 526 } 527 } 528 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 529 os::closedir(dir); 530 return path; 531} 532 533// Parses a memory size specification string. 534static bool atomull(const char *s, julong* result) { 535 julong n = 0; 536 int args_read = sscanf(s, JULONG_FORMAT, &n); 537 if (args_read != 1) { 538 return false; 539 } 540 while (*s != '\0' && isdigit(*s)) { 541 s++; 542 } 543 // 4705540: illegal if more characters are found after the first non-digit 544 if (strlen(s) > 1) { 545 return false; 546 } 547 switch (*s) { 548 case 'T': case 't': 549 *result = n * G * K; 550 // Check for overflow. 551 if (*result/((julong)G * K) != n) return false; 552 return true; 553 case 'G': case 'g': 554 *result = n * G; 555 if (*result/G != n) return false; 556 return true; 557 case 'M': case 'm': 558 *result = n * M; 559 if (*result/M != n) return false; 560 return true; 561 case 'K': case 'k': 562 *result = n * K; 563 if (*result/K != n) return false; 564 return true; 565 case '\0': 566 *result = n; 567 return true; 568 default: 569 return false; 570 } 571} 572 573Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 574 if (size < min_size) return arg_too_small; 575 // Check that size will fit in a size_t (only relevant on 32-bit) 576 if (size > max_uintx) return arg_too_big; 577 return arg_in_range; 578} 579 580// Describe an argument out of range error 581void Arguments::describe_range_error(ArgsRange errcode) { 582 switch(errcode) { 583 case arg_too_big: 584 jio_fprintf(defaultStream::error_stream(), 585 "The specified size exceeds the maximum " 586 "representable size.\n"); 587 break; 588 case arg_too_small: 589 case arg_unreadable: 590 case arg_in_range: 591 // do nothing for now 592 break; 593 default: 594 ShouldNotReachHere(); 595 } 596} 597 598static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) { 599 return CommandLineFlags::boolAtPut(name, &value, origin); 600} 601 602static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 603 double v; 604 if (sscanf(value, "%lf", &v) != 1) { 605 return false; 606 } 607 608 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 609 return true; 610 } 611 return false; 612} 613 614static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 615 julong v; 616 intx intx_v; 617 bool is_neg = false; 618 // Check the sign first since atomull() parses only unsigned values. 619 if (*value == '-') { 620 if (!CommandLineFlags::intxAt(name, &intx_v)) { 621 return false; 622 } 623 value++; 624 is_neg = true; 625 } 626 if (!atomull(value, &v)) { 627 return false; 628 } 629 intx_v = (intx) v; 630 if (is_neg) { 631 intx_v = -intx_v; 632 } 633 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 634 return true; 635 } 636 uintx uintx_v = (uintx) v; 637 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 638 return true; 639 } 640 uint64_t uint64_t_v = (uint64_t) v; 641 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 642 return true; 643 } 644 return false; 645} 646 647static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) { 648 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 649 // Contract: CommandLineFlags always returns a pointer that needs freeing. 650 FREE_C_HEAP_ARRAY(char, value, mtInternal); 651 return true; 652} 653 654static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) { 655 const char* old_value = ""; 656 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 657 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 658 size_t new_len = strlen(new_value); 659 const char* value; 660 char* free_this_too = NULL; 661 if (old_len == 0) { 662 value = new_value; 663 } else if (new_len == 0) { 664 value = old_value; 665 } else { 666 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 667 // each new setting adds another LINE to the switch: 668 sprintf(buf, "%s\n%s", old_value, new_value); 669 value = buf; 670 free_this_too = buf; 671 } 672 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 673 // CommandLineFlags always returns a pointer that needs freeing. 674 FREE_C_HEAP_ARRAY(char, value, mtInternal); 675 if (free_this_too != NULL) { 676 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 677 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 678 } 679 return true; 680} 681 682bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) { 683 684 // range of acceptable characters spelled out for portability reasons 685#define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 686#define BUFLEN 255 687 char name[BUFLEN+1]; 688 char dummy; 689 690 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 691 return set_bool_flag(name, false, origin); 692 } 693 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 694 return set_bool_flag(name, true, origin); 695 } 696 697 char punct; 698 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 699 const char* value = strchr(arg, '=') + 1; 700 Flag* flag = Flag::find_flag(name, strlen(name)); 701 if (flag != NULL && flag->is_ccstr()) { 702 if (flag->ccstr_accumulates()) { 703 return append_to_string_flag(name, value, origin); 704 } else { 705 if (value[0] == '\0') { 706 value = NULL; 707 } 708 return set_string_flag(name, value, origin); 709 } 710 } 711 } 712 713 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 714 const char* value = strchr(arg, '=') + 1; 715 // -XX:Foo:=xxx will reset the string flag to the given value. 716 if (value[0] == '\0') { 717 value = NULL; 718 } 719 return set_string_flag(name, value, origin); 720 } 721 722#define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 723#define SIGNED_NUMBER_RANGE "[-0123456789]" 724#define NUMBER_RANGE "[0123456789]" 725 char value[BUFLEN + 1]; 726 char value2[BUFLEN + 1]; 727 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 728 // Looks like a floating-point number -- try again with more lenient format string 729 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 730 return set_fp_numeric_flag(name, value, origin); 731 } 732 } 733 734#define VALUE_RANGE "[-kmgtKMGT0123456789]" 735 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 736 return set_numeric_flag(name, value, origin); 737 } 738 739 return false; 740} 741 742void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 743 assert(bldarray != NULL, "illegal argument"); 744 745 if (arg == NULL) { 746 return; 747 } 748 749 int index = *count; 750 751 // expand the array and add arg to the last element 752 (*count)++; 753 if (*bldarray == NULL) { 754 *bldarray = NEW_C_HEAP_ARRAY(char*, *count, mtInternal); 755 } else { 756 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count, mtInternal); 757 } 758 (*bldarray)[index] = strdup(arg); 759} 760 761void Arguments::build_jvm_args(const char* arg) { 762 add_string(&_jvm_args_array, &_num_jvm_args, arg); 763} 764 765void Arguments::build_jvm_flags(const char* arg) { 766 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 767} 768 769// utility function to return a string that concatenates all 770// strings in a given char** array 771const char* Arguments::build_resource_string(char** args, int count) { 772 if (args == NULL || count == 0) { 773 return NULL; 774 } 775 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 776 for (int i = 1; i < count; i++) { 777 length += strlen(args[i]) + 1; // add 1 for a space 778 } 779 char* s = NEW_RESOURCE_ARRAY(char, length); 780 strcpy(s, args[0]); 781 for (int j = 1; j < count; j++) { 782 strcat(s, " "); 783 strcat(s, args[j]); 784 } 785 return (const char*) s; 786} 787 788void Arguments::print_on(outputStream* st) { 789 st->print_cr("VM Arguments:"); 790 if (num_jvm_flags() > 0) { 791 st->print("jvm_flags: "); print_jvm_flags_on(st); 792 } 793 if (num_jvm_args() > 0) { 794 st->print("jvm_args: "); print_jvm_args_on(st); 795 } 796 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 797 if (_java_class_path != NULL) { 798 char* path = _java_class_path->value(); 799 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 800 } 801 st->print_cr("Launcher Type: %s", _sun_java_launcher); 802} 803 804void Arguments::print_jvm_flags_on(outputStream* st) { 805 if (_num_jvm_flags > 0) { 806 for (int i=0; i < _num_jvm_flags; i++) { 807 st->print("%s ", _jvm_flags_array[i]); 808 } 809 st->print_cr(""); 810 } 811} 812 813void Arguments::print_jvm_args_on(outputStream* st) { 814 if (_num_jvm_args > 0) { 815 for (int i=0; i < _num_jvm_args; i++) { 816 st->print("%s ", _jvm_args_array[i]); 817 } 818 st->print_cr(""); 819 } 820} 821 822bool Arguments::process_argument(const char* arg, 823 jboolean ignore_unrecognized, FlagValueOrigin origin) { 824 825 JDK_Version since = JDK_Version(); 826 827 if (parse_argument(arg, origin) || ignore_unrecognized) { 828 return true; 829 } 830 831 bool has_plus_minus = (*arg == '+' || *arg == '-'); 832 const char* const argname = has_plus_minus ? arg + 1 : arg; 833 if (is_newly_obsolete(arg, &since)) { 834 char version[256]; 835 since.to_string(version, sizeof(version)); 836 warning("ignoring option %s; support was removed in %s", argname, version); 837 return true; 838 } 839 840 // For locked flags, report a custom error message if available. 841 // Otherwise, report the standard unrecognized VM option. 842 843 size_t arg_len; 844 const char* equal_sign = strchr(argname, '='); 845 if (equal_sign == NULL) { 846 arg_len = strlen(argname); 847 } else { 848 arg_len = equal_sign - argname; 849 } 850 851 Flag* found_flag = Flag::find_flag((char*)argname, arg_len, true); 852 if (found_flag != NULL) { 853 char locked_message_buf[BUFLEN]; 854 found_flag->get_locked_message(locked_message_buf, BUFLEN); 855 if (strlen(locked_message_buf) == 0) { 856 if (found_flag->is_bool() && !has_plus_minus) { 857 jio_fprintf(defaultStream::error_stream(), 858 "Missing +/- setting for VM option '%s'\n", argname); 859 } else if (!found_flag->is_bool() && has_plus_minus) { 860 jio_fprintf(defaultStream::error_stream(), 861 "Unexpected +/- setting in VM option '%s'\n", argname); 862 } else { 863 jio_fprintf(defaultStream::error_stream(), 864 "Improperly specified VM option '%s'\n", argname); 865 } 866 } else { 867 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 868 } 869 } else { 870 jio_fprintf(defaultStream::error_stream(), 871 "Unrecognized VM option '%s'\n", argname); 872 } 873 874 // allow for commandline "commenting out" options like -XX:#+Verbose 875 return arg[0] == '#'; 876} 877 878bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 879 FILE* stream = fopen(file_name, "rb"); 880 if (stream == NULL) { 881 if (should_exist) { 882 jio_fprintf(defaultStream::error_stream(), 883 "Could not open settings file %s\n", file_name); 884 return false; 885 } else { 886 return true; 887 } 888 } 889 890 char token[1024]; 891 int pos = 0; 892 893 bool in_white_space = true; 894 bool in_comment = false; 895 bool in_quote = false; 896 char quote_c = 0; 897 bool result = true; 898 899 int c = getc(stream); 900 while(c != EOF && pos < (int)(sizeof(token)-1)) { 901 if (in_white_space) { 902 if (in_comment) { 903 if (c == '\n') in_comment = false; 904 } else { 905 if (c == '#') in_comment = true; 906 else if (!isspace(c)) { 907 in_white_space = false; 908 token[pos++] = c; 909 } 910 } 911 } else { 912 if (c == '\n' || (!in_quote && isspace(c))) { 913 // token ends at newline, or at unquoted whitespace 914 // this allows a way to include spaces in string-valued options 915 token[pos] = '\0'; 916 logOption(token); 917 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 918 build_jvm_flags(token); 919 pos = 0; 920 in_white_space = true; 921 in_quote = false; 922 } else if (!in_quote && (c == '\'' || c == '"')) { 923 in_quote = true; 924 quote_c = c; 925 } else if (in_quote && (c == quote_c)) { 926 in_quote = false; 927 } else { 928 token[pos++] = c; 929 } 930 } 931 c = getc(stream); 932 } 933 if (pos > 0) { 934 token[pos] = '\0'; 935 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 936 build_jvm_flags(token); 937 } 938 fclose(stream); 939 return result; 940} 941 942//============================================================================================================= 943// Parsing of properties (-D) 944 945const char* Arguments::get_property(const char* key) { 946 return PropertyList_get_value(system_properties(), key); 947} 948 949bool Arguments::add_property(const char* prop) { 950 const char* eq = strchr(prop, '='); 951 char* key; 952 // ns must be static--its address may be stored in a SystemProperty object. 953 const static char ns[1] = {0}; 954 char* value = (char *)ns; 955 956 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 957 key = AllocateHeap(key_len + 1, mtInternal); 958 strncpy(key, prop, key_len); 959 key[key_len] = '\0'; 960 961 if (eq != NULL) { 962 size_t value_len = strlen(prop) - key_len - 1; 963 value = AllocateHeap(value_len + 1, mtInternal); 964 strncpy(value, &prop[key_len + 1], value_len + 1); 965 } 966 967 if (strcmp(key, "java.compiler") == 0) { 968 process_java_compiler_argument(value); 969 FreeHeap(key); 970 if (eq != NULL) { 971 FreeHeap(value); 972 } 973 return true; 974 } else if (strcmp(key, "sun.java.command") == 0) { 975 _java_command = value; 976 977 // Record value in Arguments, but let it get passed to Java. 978 } else if (strcmp(key, "sun.java.launcher.pid") == 0) { 979 // launcher.pid property is private and is processed 980 // in process_sun_java_launcher_properties(); 981 // the sun.java.launcher property is passed on to the java application 982 FreeHeap(key); 983 if (eq != NULL) { 984 FreeHeap(value); 985 } 986 return true; 987 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 988 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 989 // its value without going through the property list or making a Java call. 990 _java_vendor_url_bug = value; 991 } else if (strcmp(key, "sun.boot.library.path") == 0) { 992 PropertyList_unique_add(&_system_properties, key, value, true); 993 return true; 994 } 995 // Create new property and add at the end of the list 996 PropertyList_unique_add(&_system_properties, key, value); 997 return true; 998} 999 1000//=========================================================================================================== 1001// Setting int/mixed/comp mode flags 1002 1003void Arguments::set_mode_flags(Mode mode) { 1004 // Set up default values for all flags. 1005 // If you add a flag to any of the branches below, 1006 // add a default value for it here. 1007 set_java_compiler(false); 1008 _mode = mode; 1009 1010 // Ensure Agent_OnLoad has the correct initial values. 1011 // This may not be the final mode; mode may change later in onload phase. 1012 PropertyList_unique_add(&_system_properties, "java.vm.info", 1013 (char*)VM_Version::vm_info_string(), false); 1014 1015 UseInterpreter = true; 1016 UseCompiler = true; 1017 UseLoopCounter = true; 1018 1019#ifndef ZERO 1020 // Turn these off for mixed and comp. Leave them on for Zero. 1021 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) { 1022 UseFastAccessorMethods = (mode == _int); 1023 } 1024 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) { 1025 UseFastEmptyMethods = (mode == _int); 1026 } 1027#endif 1028 1029 // Default values may be platform/compiler dependent - 1030 // use the saved values 1031 ClipInlining = Arguments::_ClipInlining; 1032 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1033 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1034 BackgroundCompilation = Arguments::_BackgroundCompilation; 1035 1036 // Change from defaults based on mode 1037 switch (mode) { 1038 default: 1039 ShouldNotReachHere(); 1040 break; 1041 case _int: 1042 UseCompiler = false; 1043 UseLoopCounter = false; 1044 AlwaysCompileLoopMethods = false; 1045 UseOnStackReplacement = false; 1046 break; 1047 case _mixed: 1048 // same as default 1049 break; 1050 case _comp: 1051 UseInterpreter = false; 1052 BackgroundCompilation = false; 1053 ClipInlining = false; 1054 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1055 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1056 // compile a level 4 (C2) and then continue executing it. 1057 if (TieredCompilation) { 1058 Tier3InvokeNotifyFreqLog = 0; 1059 Tier4InvocationThreshold = 0; 1060 } 1061 break; 1062 } 1063} 1064 1065// Conflict: required to use shared spaces (-Xshare:on), but 1066// incompatible command line options were chosen. 1067 1068static void no_shared_spaces() { 1069 if (RequireSharedSpaces) { 1070 jio_fprintf(defaultStream::error_stream(), 1071 "Class data sharing is inconsistent with other specified options.\n"); 1072 vm_exit_during_initialization("Unable to use shared archive.", NULL); 1073 } else { 1074 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1075 } 1076} 1077 1078void Arguments::set_tiered_flags() { 1079 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1080 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1081 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1082 } 1083 if (CompilationPolicyChoice < 2) { 1084 vm_exit_during_initialization( 1085 "Incompatible compilation policy selected", NULL); 1086 } 1087 // Increase the code cache size - tiered compiles a lot more. 1088 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1089 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5); 1090 } 1091} 1092 1093#if INCLUDE_ALL_GCS 1094static void disable_adaptive_size_policy(const char* collector_name) { 1095 if (UseAdaptiveSizePolicy) { 1096 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1097 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1098 collector_name); 1099 } 1100 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1101 } 1102} 1103 1104void Arguments::set_parnew_gc_flags() { 1105 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1106 "control point invariant"); 1107 assert(UseParNewGC, "Error"); 1108 1109 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1110 disable_adaptive_size_policy("UseParNewGC"); 1111 1112 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1113 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1114 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1115 } else if (ParallelGCThreads == 0) { 1116 jio_fprintf(defaultStream::error_stream(), 1117 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1118 vm_exit(1); 1119 } 1120 1121 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1122 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1123 // we set them to 1024 and 1024. 1124 // See CR 6362902. 1125 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1126 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1127 } 1128 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1129 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1130 } 1131 1132 // AlwaysTenure flag should make ParNew promote all at first collection. 1133 // See CR 6362902. 1134 if (AlwaysTenure) { 1135 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 1136 } 1137 // When using compressed oops, we use local overflow stacks, 1138 // rather than using a global overflow list chained through 1139 // the klass word of the object's pre-image. 1140 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1141 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1142 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1143 } 1144 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1145 } 1146 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1147} 1148 1149// Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1150// sparc/solaris for certain applications, but would gain from 1151// further optimization and tuning efforts, and would almost 1152// certainly gain from analysis of platform and environment. 1153void Arguments::set_cms_and_parnew_gc_flags() { 1154 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1155 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1156 1157 // If we are using CMS, we prefer to UseParNewGC, 1158 // unless explicitly forbidden. 1159 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1160 FLAG_SET_ERGO(bool, UseParNewGC, true); 1161 } 1162 1163 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1164 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1165 1166 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1167 // as needed. 1168 if (UseParNewGC) { 1169 set_parnew_gc_flags(); 1170 } 1171 1172 size_t max_heap = align_size_down(MaxHeapSize, 1173 CardTableRS::ct_max_alignment_constraint()); 1174 1175 // Now make adjustments for CMS 1176 intx tenuring_default = (intx)6; 1177 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1178 1179 // Preferred young gen size for "short" pauses: 1180 // upper bound depends on # of threads and NewRatio. 1181 const uintx parallel_gc_threads = 1182 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1183 const size_t preferred_max_new_size_unaligned = 1184 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1185 size_t preferred_max_new_size = 1186 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1187 1188 // Unless explicitly requested otherwise, size young gen 1189 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1190 1191 // If either MaxNewSize or NewRatio is set on the command line, 1192 // assume the user is trying to set the size of the young gen. 1193 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1194 1195 // Set MaxNewSize to our calculated preferred_max_new_size unless 1196 // NewSize was set on the command line and it is larger than 1197 // preferred_max_new_size. 1198 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1199 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1200 } else { 1201 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1202 } 1203 if (PrintGCDetails && Verbose) { 1204 // Too early to use gclog_or_tty 1205 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1206 } 1207 1208 // Code along this path potentially sets NewSize and OldSize 1209 if (PrintGCDetails && Verbose) { 1210 // Too early to use gclog_or_tty 1211 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1212 " initial_heap_size: " SIZE_FORMAT 1213 " max_heap: " SIZE_FORMAT, 1214 min_heap_size(), InitialHeapSize, max_heap); 1215 } 1216 size_t min_new = preferred_max_new_size; 1217 if (FLAG_IS_CMDLINE(NewSize)) { 1218 min_new = NewSize; 1219 } 1220 if (max_heap > min_new && min_heap_size() > min_new) { 1221 // Unless explicitly requested otherwise, make young gen 1222 // at least min_new, and at most preferred_max_new_size. 1223 if (FLAG_IS_DEFAULT(NewSize)) { 1224 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1225 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1226 if (PrintGCDetails && Verbose) { 1227 // Too early to use gclog_or_tty 1228 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1229 } 1230 } 1231 // Unless explicitly requested otherwise, size old gen 1232 // so it's NewRatio x of NewSize. 1233 if (FLAG_IS_DEFAULT(OldSize)) { 1234 if (max_heap > NewSize) { 1235 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1236 if (PrintGCDetails && Verbose) { 1237 // Too early to use gclog_or_tty 1238 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1239 } 1240 } 1241 } 1242 } 1243 } 1244 // Unless explicitly requested otherwise, definitely 1245 // promote all objects surviving "tenuring_default" scavenges. 1246 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1247 FLAG_IS_DEFAULT(SurvivorRatio)) { 1248 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1249 } 1250 // If we decided above (or user explicitly requested) 1251 // `promote all' (via MaxTenuringThreshold := 0), 1252 // prefer minuscule survivor spaces so as not to waste 1253 // space for (non-existent) survivors 1254 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1255 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1256 } 1257 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1258 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1259 // This is done in order to make ParNew+CMS configuration to work 1260 // with YoungPLABSize and OldPLABSize options. 1261 // See CR 6362902. 1262 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1263 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1264 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1265 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1266 // the value (either from the command line or ergonomics) of 1267 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1268 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1269 } else { 1270 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1271 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1272 // we'll let it to take precedence. 1273 jio_fprintf(defaultStream::error_stream(), 1274 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1275 " options are specified for the CMS collector." 1276 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1277 } 1278 } 1279 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1280 // OldPLAB sizing manually turned off: Use a larger default setting, 1281 // unless it was manually specified. This is because a too-low value 1282 // will slow down scavenges. 1283 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1284 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1285 } 1286 } 1287 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1288 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1289 // If either of the static initialization defaults have changed, note this 1290 // modification. 1291 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1292 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1293 } 1294 if (PrintGCDetails && Verbose) { 1295 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1296 MarkStackSize / K, MarkStackSizeMax / K); 1297 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1298 } 1299} 1300#endif // INCLUDE_ALL_GCS 1301 1302void set_object_alignment() { 1303 // Object alignment. 1304 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1305 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1306 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1307 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1308 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1309 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1310 1311 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1312 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1313 1314 // Oop encoding heap max 1315 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1316 1317#if INCLUDE_ALL_GCS 1318 // Set CMS global values 1319 CompactibleFreeListSpace::set_cms_values(); 1320#endif // INCLUDE_ALL_GCS 1321} 1322 1323bool verify_object_alignment() { 1324 // Object alignment. 1325 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1326 jio_fprintf(defaultStream::error_stream(), 1327 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1328 (int)ObjectAlignmentInBytes); 1329 return false; 1330 } 1331 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1332 jio_fprintf(defaultStream::error_stream(), 1333 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1334 (int)ObjectAlignmentInBytes, BytesPerLong); 1335 return false; 1336 } 1337 // It does not make sense to have big object alignment 1338 // since a space lost due to alignment will be greater 1339 // then a saved space from compressed oops. 1340 if ((int)ObjectAlignmentInBytes > 256) { 1341 jio_fprintf(defaultStream::error_stream(), 1342 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1343 (int)ObjectAlignmentInBytes); 1344 return false; 1345 } 1346 // In case page size is very small. 1347 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1348 jio_fprintf(defaultStream::error_stream(), 1349 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1350 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1351 return false; 1352 } 1353 return true; 1354} 1355 1356inline uintx max_heap_for_compressed_oops() { 1357 // Avoid sign flip. 1358 if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) { 1359 return 0; 1360 } 1361 LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size()); 1362 NOT_LP64(ShouldNotReachHere(); return 0); 1363} 1364 1365bool Arguments::should_auto_select_low_pause_collector() { 1366 if (UseAutoGCSelectPolicy && 1367 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1368 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1369 if (PrintGCDetails) { 1370 // Cannot use gclog_or_tty yet. 1371 tty->print_cr("Automatic selection of the low pause collector" 1372 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1373 } 1374 return true; 1375 } 1376 return false; 1377} 1378 1379void Arguments::set_use_compressed_oops() { 1380#ifndef ZERO 1381#ifdef _LP64 1382 // MaxHeapSize is not set up properly at this point, but 1383 // the only value that can override MaxHeapSize if we are 1384 // to use UseCompressedOops is InitialHeapSize. 1385 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1386 1387 if (max_heap_size <= max_heap_for_compressed_oops()) { 1388#if !defined(COMPILER1) || defined(TIERED) 1389 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1390 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1391 } 1392#endif 1393#ifdef _WIN64 1394 if (UseLargePages && UseCompressedOops) { 1395 // Cannot allocate guard pages for implicit checks in indexed addressing 1396 // mode, when large pages are specified on windows. 1397 // This flag could be switched ON if narrow oop base address is set to 0, 1398 // see code in Universe::initialize_heap(). 1399 Universe::set_narrow_oop_use_implicit_null_checks(false); 1400 } 1401#endif // _WIN64 1402 } else { 1403 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1404 warning("Max heap size too large for Compressed Oops"); 1405 FLAG_SET_DEFAULT(UseCompressedOops, false); 1406 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1407 } 1408 } 1409#endif // _LP64 1410#endif // ZERO 1411} 1412 1413void Arguments::set_ergonomics_flags() { 1414 1415 if (os::is_server_class_machine()) { 1416 // If no other collector is requested explicitly, 1417 // let the VM select the collector based on 1418 // machine class and automatic selection policy. 1419 if (!UseSerialGC && 1420 !UseConcMarkSweepGC && 1421 !UseG1GC && 1422 !UseParNewGC && 1423 FLAG_IS_DEFAULT(UseParallelGC)) { 1424 if (should_auto_select_low_pause_collector()) { 1425 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1426 } else { 1427 FLAG_SET_ERGO(bool, UseParallelGC, true); 1428 } 1429 } 1430 // Shared spaces work fine with other GCs but causes bytecode rewriting 1431 // to be disabled, which hurts interpreter performance and decreases 1432 // server performance. On server class machines, keep the default 1433 // off unless it is asked for. Future work: either add bytecode rewriting 1434 // at link time, or rewrite bytecodes in non-shared methods. 1435 if (!DumpSharedSpaces && !RequireSharedSpaces) { 1436 no_shared_spaces(); 1437 } 1438 } 1439 1440#ifndef ZERO 1441#ifdef _LP64 1442 set_use_compressed_oops(); 1443 // UseCompressedOops must be on for UseCompressedKlassPointers to be on. 1444 if (!UseCompressedOops) { 1445 if (UseCompressedKlassPointers) { 1446 warning("UseCompressedKlassPointers requires UseCompressedOops"); 1447 } 1448 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1449 } else { 1450 // Turn on UseCompressedKlassPointers too 1451 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) { 1452 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true); 1453 } 1454 // Set the ClassMetaspaceSize to something that will not need to be 1455 // expanded, since it cannot be expanded. 1456 if (UseCompressedKlassPointers) { 1457 if (ClassMetaspaceSize > KlassEncodingMetaspaceMax) { 1458 warning("Class metaspace size is too large for UseCompressedKlassPointers"); 1459 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1460 } else if (FLAG_IS_DEFAULT(ClassMetaspaceSize)) { 1461 // 100,000 classes seems like a good size, so 100M assumes around 1K 1462 // per klass. The vtable and oopMap is embedded so we don't have a fixed 1463 // size per klass. Eventually, this will be parameterized because it 1464 // would also be useful to determine the optimal size of the 1465 // systemDictionary. 1466 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M); 1467 } 1468 } 1469 } 1470 // Also checks that certain machines are slower with compressed oops 1471 // in vm_version initialization code. 1472#endif // _LP64 1473#endif // !ZERO 1474} 1475 1476void Arguments::set_parallel_gc_flags() { 1477 assert(UseParallelGC || UseParallelOldGC, "Error"); 1478 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1479 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1480 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1481 } 1482 FLAG_SET_DEFAULT(UseParallelGC, true); 1483 1484 // If no heap maximum was requested explicitly, use some reasonable fraction 1485 // of the physical memory, up to a maximum of 1GB. 1486 FLAG_SET_DEFAULT(ParallelGCThreads, 1487 Abstract_VM_Version::parallel_worker_threads()); 1488 if (ParallelGCThreads == 0) { 1489 jio_fprintf(defaultStream::error_stream(), 1490 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1491 vm_exit(1); 1492 } 1493 1494 1495 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1496 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1497 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1498 // See CR 6362902 for details. 1499 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1500 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1501 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1502 } 1503 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1504 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1505 } 1506 } 1507 1508 if (UseParallelOldGC) { 1509 // Par compact uses lower default values since they are treated as 1510 // minimums. These are different defaults because of the different 1511 // interpretation and are not ergonomically set. 1512 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1513 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1514 } 1515 } 1516} 1517 1518void Arguments::set_g1_gc_flags() { 1519 assert(UseG1GC, "Error"); 1520#ifdef COMPILER1 1521 FastTLABRefill = false; 1522#endif 1523 FLAG_SET_DEFAULT(ParallelGCThreads, 1524 Abstract_VM_Version::parallel_worker_threads()); 1525 if (ParallelGCThreads == 0) { 1526 FLAG_SET_DEFAULT(ParallelGCThreads, 1527 Abstract_VM_Version::parallel_worker_threads()); 1528 } 1529 1530 // MarkStackSize will be set (if it hasn't been set by the user) 1531 // when concurrent marking is initialized. 1532 // Its value will be based upon the number of parallel marking threads. 1533 // But we do set the maximum mark stack size here. 1534 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1535 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1536 } 1537 1538 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1539 // In G1, we want the default GC overhead goal to be higher than 1540 // say in PS. So we set it here to 10%. Otherwise the heap might 1541 // be expanded more aggressively than we would like it to. In 1542 // fact, even 10% seems to not be high enough in some cases 1543 // (especially small GC stress tests that the main thing they do 1544 // is allocation). We might consider increase it further. 1545 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1546 } 1547 1548 if (PrintGCDetails && Verbose) { 1549 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1550 MarkStackSize / K, MarkStackSizeMax / K); 1551 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1552 } 1553} 1554 1555julong Arguments::limit_by_allocatable_memory(julong limit) { 1556 julong max_allocatable; 1557 julong result = limit; 1558 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1559 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1560 } 1561 return result; 1562} 1563 1564void Arguments::set_heap_size() { 1565 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1566 // Deprecated flag 1567 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1568 } 1569 1570 const julong phys_mem = 1571 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1572 : (julong)MaxRAM; 1573 1574 // If the maximum heap size has not been set with -Xmx, 1575 // then set it as fraction of the size of physical memory, 1576 // respecting the maximum and minimum sizes of the heap. 1577 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1578 julong reasonable_max = phys_mem / MaxRAMFraction; 1579 1580 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1581 // Small physical memory, so use a minimum fraction of it for the heap 1582 reasonable_max = phys_mem / MinRAMFraction; 1583 } else { 1584 // Not-small physical memory, so require a heap at least 1585 // as large as MaxHeapSize 1586 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1587 } 1588 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1589 // Limit the heap size to ErgoHeapSizeLimit 1590 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1591 } 1592 if (UseCompressedOops) { 1593 // Limit the heap size to the maximum possible when using compressed oops 1594 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1595 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1596 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1597 // but it should be not less than default MaxHeapSize. 1598 max_coop_heap -= HeapBaseMinAddress; 1599 } 1600 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1601 } 1602 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1603 1604 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1605 // An initial heap size was specified on the command line, 1606 // so be sure that the maximum size is consistent. Done 1607 // after call to limit_by_allocatable_memory because that 1608 // method might reduce the allocation size. 1609 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1610 } 1611 1612 if (PrintGCDetails && Verbose) { 1613 // Cannot use gclog_or_tty yet. 1614 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1615 } 1616 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1617 } 1618 1619 // If the initial_heap_size has not been set with InitialHeapSize 1620 // or -Xms, then set it as fraction of the size of physical memory, 1621 // respecting the maximum and minimum sizes of the heap. 1622 if (FLAG_IS_DEFAULT(InitialHeapSize)) { 1623 julong reasonable_minimum = (julong)(OldSize + NewSize); 1624 1625 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1626 1627 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1628 1629 julong reasonable_initial = phys_mem / InitialRAMFraction; 1630 1631 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum); 1632 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1633 1634 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1635 1636 if (PrintGCDetails && Verbose) { 1637 // Cannot use gclog_or_tty yet. 1638 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1639 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum); 1640 } 1641 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1642 set_min_heap_size((uintx)reasonable_minimum); 1643 } 1644} 1645 1646// This must be called after ergonomics because we want bytecode rewriting 1647// if the server compiler is used, or if UseSharedSpaces is disabled. 1648void Arguments::set_bytecode_flags() { 1649 // Better not attempt to store into a read-only space. 1650 if (UseSharedSpaces) { 1651 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1652 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1653 } 1654 1655 if (!RewriteBytecodes) { 1656 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1657 } 1658} 1659 1660// Aggressive optimization flags -XX:+AggressiveOpts 1661void Arguments::set_aggressive_opts_flags() { 1662#ifdef COMPILER2 1663 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1664 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1665 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1666 } 1667 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1668 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1669 } 1670 1671 // Feed the cache size setting into the JDK 1672 char buffer[1024]; 1673 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1674 add_property(buffer); 1675 } 1676 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1677 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1678 } 1679#endif 1680 1681 if (AggressiveOpts) { 1682// Sample flag setting code 1683// if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1684// FLAG_SET_DEFAULT(EliminateZeroing, true); 1685// } 1686 } 1687} 1688 1689//=========================================================================================================== 1690// Parsing of java.compiler property 1691 1692void Arguments::process_java_compiler_argument(char* arg) { 1693 // For backwards compatibility, Djava.compiler=NONE or "" 1694 // causes us to switch to -Xint mode UNLESS -Xdebug 1695 // is also specified. 1696 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1697 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1698 } 1699} 1700 1701void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1702 _sun_java_launcher = strdup(launcher); 1703 if (strcmp("gamma", _sun_java_launcher) == 0) { 1704 _created_by_gamma_launcher = true; 1705 } 1706} 1707 1708bool Arguments::created_by_java_launcher() { 1709 assert(_sun_java_launcher != NULL, "property must have value"); 1710 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1711} 1712 1713bool Arguments::created_by_gamma_launcher() { 1714 return _created_by_gamma_launcher; 1715} 1716 1717//=========================================================================================================== 1718// Parsing of main arguments 1719 1720bool Arguments::verify_interval(uintx val, uintx min, 1721 uintx max, const char* name) { 1722 // Returns true iff value is in the inclusive interval [min..max] 1723 // false, otherwise. 1724 if (val >= min && val <= max) { 1725 return true; 1726 } 1727 jio_fprintf(defaultStream::error_stream(), 1728 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1729 " and " UINTX_FORMAT "\n", 1730 name, val, min, max); 1731 return false; 1732} 1733 1734bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1735 // Returns true if given value is at least specified min threshold 1736 // false, otherwise. 1737 if (val >= min ) { 1738 return true; 1739 } 1740 jio_fprintf(defaultStream::error_stream(), 1741 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1742 name, val, min); 1743 return false; 1744} 1745 1746bool Arguments::verify_percentage(uintx value, const char* name) { 1747 if (value <= 100) { 1748 return true; 1749 } 1750 jio_fprintf(defaultStream::error_stream(), 1751 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1752 name, value); 1753 return false; 1754} 1755 1756static bool verify_serial_gc_flags() { 1757 return (UseSerialGC && 1758 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1759 UseParallelGC || UseParallelOldGC)); 1760} 1761 1762// check if do gclog rotation 1763// +UseGCLogFileRotation is a must, 1764// no gc log rotation when log file not supplied or 1765// NumberOfGCLogFiles is 0, or GCLogFileSize is 0 1766void check_gclog_consistency() { 1767 if (UseGCLogFileRotation) { 1768 if ((Arguments::gc_log_filename() == NULL) || 1769 (NumberOfGCLogFiles == 0) || 1770 (GCLogFileSize == 0)) { 1771 jio_fprintf(defaultStream::output_stream(), 1772 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n" 1773 "where num_of_file > 0 and num_of_size > 0\n" 1774 "GC log rotation is turned off\n"); 1775 UseGCLogFileRotation = false; 1776 } 1777 } 1778 1779 if (UseGCLogFileRotation && GCLogFileSize < 8*K) { 1780 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1781 jio_fprintf(defaultStream::output_stream(), 1782 "GCLogFileSize changed to minimum 8K\n"); 1783 } 1784} 1785 1786// Check consistency of GC selection 1787bool Arguments::check_gc_consistency() { 1788 check_gclog_consistency(); 1789 bool status = true; 1790 // Ensure that the user has not selected conflicting sets 1791 // of collectors. [Note: this check is merely a user convenience; 1792 // collectors over-ride each other so that only a non-conflicting 1793 // set is selected; however what the user gets is not what they 1794 // may have expected from the combination they asked for. It's 1795 // better to reduce user confusion by not allowing them to 1796 // select conflicting combinations. 1797 uint i = 0; 1798 if (UseSerialGC) i++; 1799 if (UseConcMarkSweepGC || UseParNewGC) i++; 1800 if (UseParallelGC || UseParallelOldGC) i++; 1801 if (UseG1GC) i++; 1802 if (i > 1) { 1803 jio_fprintf(defaultStream::error_stream(), 1804 "Conflicting collector combinations in option list; " 1805 "please refer to the release notes for the combinations " 1806 "allowed\n"); 1807 status = false; 1808 } 1809 1810 return status; 1811} 1812 1813void Arguments::check_deprecated_gcs() { 1814 if (UseConcMarkSweepGC && !UseParNewGC) { 1815 warning("Using the DefNew young collector with the CMS collector is deprecated " 1816 "and will likely be removed in a future release"); 1817 } 1818 1819 if (UseParNewGC && !UseConcMarkSweepGC) { 1820 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 1821 // set up UseSerialGC properly, so that can't be used in the check here. 1822 warning("Using the ParNew young collector with the Serial old collector is deprecated " 1823 "and will likely be removed in a future release"); 1824 } 1825 1826 if (CMSIncrementalMode) { 1827 warning("Using incremental CMS is deprecated and will likely be removed in a future release"); 1828 } 1829} 1830 1831void Arguments::check_deprecated_gc_flags() { 1832 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 1833 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 1834 "and will likely be removed in future release"); 1835 } 1836} 1837 1838// Check stack pages settings 1839bool Arguments::check_stack_pages() 1840{ 1841 bool status = true; 1842 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 1843 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 1844 // greater stack shadow pages can't generate instruction to bang stack 1845 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 1846 return status; 1847} 1848 1849// Check the consistency of vm_init_args 1850bool Arguments::check_vm_args_consistency() { 1851 // Method for adding checks for flag consistency. 1852 // The intent is to warn the user of all possible conflicts, 1853 // before returning an error. 1854 // Note: Needs platform-dependent factoring. 1855 bool status = true; 1856 1857#if ( (defined(COMPILER2) && defined(SPARC))) 1858 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init 1859 // on sparc doesn't require generation of a stub as is the case on, e.g., 1860 // x86. Normally, VM_Version_init must be called from init_globals in 1861 // init.cpp, which is called by the initial java thread *after* arguments 1862 // have been parsed. VM_Version_init gets called twice on sparc. 1863 extern void VM_Version_init(); 1864 VM_Version_init(); 1865 if (!VM_Version::has_v9()) { 1866 jio_fprintf(defaultStream::error_stream(), 1867 "V8 Machine detected, Server requires V9\n"); 1868 status = false; 1869 } 1870#endif /* COMPILER2 && SPARC */ 1871 1872 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 1873 // builds so the cost of stack banging can be measured. 1874#if (defined(PRODUCT) && defined(SOLARIS)) 1875 if (!UseBoundThreads && !UseStackBanging) { 1876 jio_fprintf(defaultStream::error_stream(), 1877 "-UseStackBanging conflicts with -UseBoundThreads\n"); 1878 1879 status = false; 1880 } 1881#endif 1882 1883 if (TLABRefillWasteFraction == 0) { 1884 jio_fprintf(defaultStream::error_stream(), 1885 "TLABRefillWasteFraction should be a denominator, " 1886 "not " SIZE_FORMAT "\n", 1887 TLABRefillWasteFraction); 1888 status = false; 1889 } 1890 1891 status = status && verify_percentage(AdaptiveSizePolicyWeight, 1892 "AdaptiveSizePolicyWeight"); 1893 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 1894 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 1895 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 1896 1897 // Divide by bucket size to prevent a large size from causing rollover when 1898 // calculating amount of memory needed to be allocated for the String table. 1899 status = status && verify_interval(StringTableSize, defaultStringTableSize, 1900 (max_uintx / StringTable::bucket_size()), "StringTable size"); 1901 1902 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 1903 jio_fprintf(defaultStream::error_stream(), 1904 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1905 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 1906 MinHeapFreeRatio, MaxHeapFreeRatio); 1907 status = false; 1908 } 1909 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1910 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 1911 1912 // Min/MaxMetaspaceFreeRatio 1913 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 1914 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 1915 1916 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 1917 jio_fprintf(defaultStream::error_stream(), 1918 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 1919 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 1920 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 1921 MinMetaspaceFreeRatio, 1922 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 1923 MaxMetaspaceFreeRatio); 1924 status = false; 1925 } 1926 1927 // Trying to keep 100% free is not practical 1928 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 1929 1930 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 1931 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 1932 } 1933 1934 if (UseParallelOldGC && ParallelOldGCSplitALot) { 1935 // Settings to encourage splitting. 1936 if (!FLAG_IS_CMDLINE(NewRatio)) { 1937 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 1938 } 1939 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 1940 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 1941 } 1942 } 1943 1944 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1945 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 1946 if (GCTimeLimit == 100) { 1947 // Turn off gc-overhead-limit-exceeded checks 1948 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 1949 } 1950 1951 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1952 1953 status = status && check_gc_consistency(); 1954 status = status && check_stack_pages(); 1955 1956 if (_has_alloc_profile) { 1957 if (UseParallelGC || UseParallelOldGC) { 1958 jio_fprintf(defaultStream::error_stream(), 1959 "error: invalid argument combination.\n" 1960 "Allocation profiling (-Xaprof) cannot be used together with " 1961 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n"); 1962 status = false; 1963 } 1964 if (UseConcMarkSweepGC) { 1965 jio_fprintf(defaultStream::error_stream(), 1966 "error: invalid argument combination.\n" 1967 "Allocation profiling (-Xaprof) cannot be used together with " 1968 "the CMS collector (-XX:+UseConcMarkSweepGC).\n"); 1969 status = false; 1970 } 1971 } 1972 1973 if (CMSIncrementalMode) { 1974 if (!UseConcMarkSweepGC) { 1975 jio_fprintf(defaultStream::error_stream(), 1976 "error: invalid argument combination.\n" 1977 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 1978 "selected in order\nto use CMSIncrementalMode.\n"); 1979 status = false; 1980 } else { 1981 status = status && verify_percentage(CMSIncrementalDutyCycle, 1982 "CMSIncrementalDutyCycle"); 1983 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 1984 "CMSIncrementalDutyCycleMin"); 1985 status = status && verify_percentage(CMSIncrementalSafetyFactor, 1986 "CMSIncrementalSafetyFactor"); 1987 status = status && verify_percentage(CMSIncrementalOffset, 1988 "CMSIncrementalOffset"); 1989 status = status && verify_percentage(CMSExpAvgFactor, 1990 "CMSExpAvgFactor"); 1991 // If it was not set on the command line, set 1992 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 1993 if (CMSInitiatingOccupancyFraction < 0) { 1994 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 1995 } 1996 } 1997 } 1998 1999 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2000 // insists that we hold the requisite locks so that the iteration is 2001 // MT-safe. For the verification at start-up and shut-down, we don't 2002 // yet have a good way of acquiring and releasing these locks, 2003 // which are not visible at the CollectedHeap level. We want to 2004 // be able to acquire these locks and then do the iteration rather 2005 // than just disable the lock verification. This will be fixed under 2006 // bug 4788986. 2007 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2008 if (VerifyGCStartAt == 0) { 2009 warning("Heap verification at start-up disabled " 2010 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2011 VerifyGCStartAt = 1; // Disable verification at start-up 2012 } 2013 if (VerifyBeforeExit) { 2014 warning("Heap verification at shutdown disabled " 2015 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2016 VerifyBeforeExit = false; // Disable verification at shutdown 2017 } 2018 } 2019 2020 // Note: only executed in non-PRODUCT mode 2021 if (!UseAsyncConcMarkSweepGC && 2022 (ExplicitGCInvokesConcurrent || 2023 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2024 jio_fprintf(defaultStream::error_stream(), 2025 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2026 " with -UseAsyncConcMarkSweepGC"); 2027 status = false; 2028 } 2029 2030 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2031 2032#if INCLUDE_ALL_GCS 2033 if (UseG1GC) { 2034 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2035 "InitiatingHeapOccupancyPercent"); 2036 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2037 "G1RefProcDrainInterval"); 2038 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2039 "G1ConcMarkStepDurationMillis"); 2040 } 2041#endif // INCLUDE_ALL_GCS 2042 2043 status = status && verify_interval(RefDiscoveryPolicy, 2044 ReferenceProcessor::DiscoveryPolicyMin, 2045 ReferenceProcessor::DiscoveryPolicyMax, 2046 "RefDiscoveryPolicy"); 2047 2048 // Limit the lower bound of this flag to 1 as it is used in a division 2049 // expression. 2050 status = status && verify_interval(TLABWasteTargetPercent, 2051 1, 100, "TLABWasteTargetPercent"); 2052 2053 status = status && verify_object_alignment(); 2054 2055 status = status && verify_min_value(ClassMetaspaceSize, 1*M, 2056 "ClassMetaspaceSize"); 2057 2058 status = status && verify_interval(MarkStackSizeMax, 2059 1, (max_jint - 1), "MarkStackSizeMax"); 2060 2061#ifdef SPARC 2062 if (UseConcMarkSweepGC || UseG1GC) { 2063 // Issue a stern warning if the user has explicitly set 2064 // UseMemSetInBOT (it is known to cause issues), but allow 2065 // use for experimentation and debugging. 2066 if (VM_Version::is_sun4v() && UseMemSetInBOT) { 2067 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error"); 2068 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability" 2069 " on sun4v; please understand that you are using at your own risk!"); 2070 } 2071 } 2072#endif // SPARC 2073 2074 if (PrintNMTStatistics) { 2075#if INCLUDE_NMT 2076 if (MemTracker::tracking_level() == MemTracker::NMT_off) { 2077#endif // INCLUDE_NMT 2078 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2079 PrintNMTStatistics = false; 2080#if INCLUDE_NMT 2081 } 2082#endif 2083 } 2084 2085 return status; 2086} 2087 2088bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2089 const char* option_type) { 2090 if (ignore) return false; 2091 2092 const char* spacer = " "; 2093 if (option_type == NULL) { 2094 option_type = ++spacer; // Set both to the empty string. 2095 } 2096 2097 if (os::obsolete_option(option)) { 2098 jio_fprintf(defaultStream::error_stream(), 2099 "Obsolete %s%soption: %s\n", option_type, spacer, 2100 option->optionString); 2101 return false; 2102 } else { 2103 jio_fprintf(defaultStream::error_stream(), 2104 "Unrecognized %s%soption: %s\n", option_type, spacer, 2105 option->optionString); 2106 return true; 2107 } 2108} 2109 2110static const char* user_assertion_options[] = { 2111 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2112}; 2113 2114static const char* system_assertion_options[] = { 2115 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2116}; 2117 2118// Return true if any of the strings in null-terminated array 'names' matches. 2119// If tail_allowed is true, then the tail must begin with a colon; otherwise, 2120// the option must match exactly. 2121static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2122 bool tail_allowed) { 2123 for (/* empty */; *names != NULL; ++names) { 2124 if (match_option(option, *names, tail)) { 2125 if (**tail == '\0' || tail_allowed && **tail == ':') { 2126 return true; 2127 } 2128 } 2129 } 2130 return false; 2131} 2132 2133bool Arguments::parse_uintx(const char* value, 2134 uintx* uintx_arg, 2135 uintx min_size) { 2136 2137 // Check the sign first since atomull() parses only unsigned values. 2138 bool value_is_positive = !(*value == '-'); 2139 2140 if (value_is_positive) { 2141 julong n; 2142 bool good_return = atomull(value, &n); 2143 if (good_return) { 2144 bool above_minimum = n >= min_size; 2145 bool value_is_too_large = n > max_uintx; 2146 2147 if (above_minimum && !value_is_too_large) { 2148 *uintx_arg = n; 2149 return true; 2150 } 2151 } 2152 } 2153 return false; 2154} 2155 2156Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2157 julong* long_arg, 2158 julong min_size) { 2159 if (!atomull(s, long_arg)) return arg_unreadable; 2160 return check_memory_size(*long_arg, min_size); 2161} 2162 2163// Parse JavaVMInitArgs structure 2164 2165jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2166 // For components of the system classpath. 2167 SysClassPath scp(Arguments::get_sysclasspath()); 2168 bool scp_assembly_required = false; 2169 2170 // Save default settings for some mode flags 2171 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2172 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2173 Arguments::_ClipInlining = ClipInlining; 2174 Arguments::_BackgroundCompilation = BackgroundCompilation; 2175 2176 // Setup flags for mixed which is the default 2177 set_mode_flags(_mixed); 2178 2179 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2180 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2181 if (result != JNI_OK) { 2182 return result; 2183 } 2184 2185 // Parse JavaVMInitArgs structure passed in 2186 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE); 2187 if (result != JNI_OK) { 2188 return result; 2189 } 2190 2191 if (AggressiveOpts) { 2192 // Insert alt-rt.jar between user-specified bootclasspath 2193 // prefix and the default bootclasspath. os::set_boot_path() 2194 // uses meta_index_dir as the default bootclasspath directory. 2195 const char* altclasses_jar = "alt-rt.jar"; 2196 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 + 2197 strlen(altclasses_jar); 2198 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal); 2199 strcpy(altclasses_path, get_meta_index_dir()); 2200 strcat(altclasses_path, altclasses_jar); 2201 scp.add_suffix_to_prefix(altclasses_path); 2202 scp_assembly_required = true; 2203 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal); 2204 } 2205 2206 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2207 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2208 if (result != JNI_OK) { 2209 return result; 2210 } 2211 2212 // Do final processing now that all arguments have been parsed 2213 result = finalize_vm_init_args(&scp, scp_assembly_required); 2214 if (result != JNI_OK) { 2215 return result; 2216 } 2217 2218 return JNI_OK; 2219} 2220 2221jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2222 SysClassPath* scp_p, 2223 bool* scp_assembly_required_p, 2224 FlagValueOrigin origin) { 2225 // Remaining part of option string 2226 const char* tail; 2227 2228 // iterate over arguments 2229 for (int index = 0; index < args->nOptions; index++) { 2230 bool is_absolute_path = false; // for -agentpath vs -agentlib 2231 2232 const JavaVMOption* option = args->options + index; 2233 2234 if (!match_option(option, "-Djava.class.path", &tail) && 2235 !match_option(option, "-Dsun.java.command", &tail) && 2236 !match_option(option, "-Dsun.java.launcher", &tail)) { 2237 2238 // add all jvm options to the jvm_args string. This string 2239 // is used later to set the java.vm.args PerfData string constant. 2240 // the -Djava.class.path and the -Dsun.java.command options are 2241 // omitted from jvm_args string as each have their own PerfData 2242 // string constant object. 2243 build_jvm_args(option->optionString); 2244 } 2245 2246 // -verbose:[class/gc/jni] 2247 if (match_option(option, "-verbose", &tail)) { 2248 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2249 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2250 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2251 } else if (!strcmp(tail, ":gc")) { 2252 FLAG_SET_CMDLINE(bool, PrintGC, true); 2253 } else if (!strcmp(tail, ":jni")) { 2254 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2255 } 2256 // -da / -ea / -disableassertions / -enableassertions 2257 // These accept an optional class/package name separated by a colon, e.g., 2258 // -da:java.lang.Thread. 2259 } else if (match_option(option, user_assertion_options, &tail, true)) { 2260 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2261 if (*tail == '\0') { 2262 JavaAssertions::setUserClassDefault(enable); 2263 } else { 2264 assert(*tail == ':', "bogus match by match_option()"); 2265 JavaAssertions::addOption(tail + 1, enable); 2266 } 2267 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2268 } else if (match_option(option, system_assertion_options, &tail, false)) { 2269 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2270 JavaAssertions::setSystemClassDefault(enable); 2271 // -bootclasspath: 2272 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2273 scp_p->reset_path(tail); 2274 *scp_assembly_required_p = true; 2275 // -bootclasspath/a: 2276 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2277 scp_p->add_suffix(tail); 2278 *scp_assembly_required_p = true; 2279 // -bootclasspath/p: 2280 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2281 scp_p->add_prefix(tail); 2282 *scp_assembly_required_p = true; 2283 // -Xrun 2284 } else if (match_option(option, "-Xrun", &tail)) { 2285 if (tail != NULL) { 2286 const char* pos = strchr(tail, ':'); 2287 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2288 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2289 name[len] = '\0'; 2290 2291 char *options = NULL; 2292 if(pos != NULL) { 2293 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2294 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2295 } 2296#if !INCLUDE_JVMTI 2297 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2298 jio_fprintf(defaultStream::error_stream(), 2299 "Profiling and debugging agents are not supported in this VM\n"); 2300 return JNI_ERR; 2301 } 2302#endif // !INCLUDE_JVMTI 2303 add_init_library(name, options); 2304 } 2305 // -agentlib and -agentpath 2306 } else if (match_option(option, "-agentlib:", &tail) || 2307 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2308 if(tail != NULL) { 2309 const char* pos = strchr(tail, '='); 2310 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2311 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2312 name[len] = '\0'; 2313 2314 char *options = NULL; 2315 if(pos != NULL) { 2316 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2317 } 2318#if !INCLUDE_JVMTI 2319 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2320 jio_fprintf(defaultStream::error_stream(), 2321 "Profiling and debugging agents are not supported in this VM\n"); 2322 return JNI_ERR; 2323 } 2324#endif // !INCLUDE_JVMTI 2325 add_init_agent(name, options, is_absolute_path); 2326 } 2327 // -javaagent 2328 } else if (match_option(option, "-javaagent:", &tail)) { 2329#if !INCLUDE_JVMTI 2330 jio_fprintf(defaultStream::error_stream(), 2331 "Instrumentation agents are not supported in this VM\n"); 2332 return JNI_ERR; 2333#else 2334 if(tail != NULL) { 2335 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2336 add_init_agent("instrument", options, false); 2337 } 2338#endif // !INCLUDE_JVMTI 2339 // -Xnoclassgc 2340 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2341 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2342 // -Xincgc: i-CMS 2343 } else if (match_option(option, "-Xincgc", &tail)) { 2344 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2345 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2346 // -Xnoincgc: no i-CMS 2347 } else if (match_option(option, "-Xnoincgc", &tail)) { 2348 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2349 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2350 // -Xconcgc 2351 } else if (match_option(option, "-Xconcgc", &tail)) { 2352 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2353 // -Xnoconcgc 2354 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2355 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2356 // -Xbatch 2357 } else if (match_option(option, "-Xbatch", &tail)) { 2358 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2359 // -Xmn for compatibility with other JVM vendors 2360 } else if (match_option(option, "-Xmn", &tail)) { 2361 julong long_initial_eden_size = 0; 2362 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1); 2363 if (errcode != arg_in_range) { 2364 jio_fprintf(defaultStream::error_stream(), 2365 "Invalid initial eden size: %s\n", option->optionString); 2366 describe_range_error(errcode); 2367 return JNI_EINVAL; 2368 } 2369 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size); 2370 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size); 2371 // -Xms 2372 } else if (match_option(option, "-Xms", &tail)) { 2373 julong long_initial_heap_size = 0; 2374 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1); 2375 if (errcode != arg_in_range) { 2376 jio_fprintf(defaultStream::error_stream(), 2377 "Invalid initial heap size: %s\n", option->optionString); 2378 describe_range_error(errcode); 2379 return JNI_EINVAL; 2380 } 2381 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2382 // Currently the minimum size and the initial heap sizes are the same. 2383 set_min_heap_size(InitialHeapSize); 2384 // -Xmx 2385 } else if (match_option(option, "-Xmx", &tail)) { 2386 julong long_max_heap_size = 0; 2387 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2388 if (errcode != arg_in_range) { 2389 jio_fprintf(defaultStream::error_stream(), 2390 "Invalid maximum heap size: %s\n", option->optionString); 2391 describe_range_error(errcode); 2392 return JNI_EINVAL; 2393 } 2394 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2395 // Xmaxf 2396 } else if (match_option(option, "-Xmaxf", &tail)) { 2397 int maxf = (int)(atof(tail) * 100); 2398 if (maxf < 0 || maxf > 100) { 2399 jio_fprintf(defaultStream::error_stream(), 2400 "Bad max heap free percentage size: %s\n", 2401 option->optionString); 2402 return JNI_EINVAL; 2403 } else { 2404 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2405 } 2406 // Xminf 2407 } else if (match_option(option, "-Xminf", &tail)) { 2408 int minf = (int)(atof(tail) * 100); 2409 if (minf < 0 || minf > 100) { 2410 jio_fprintf(defaultStream::error_stream(), 2411 "Bad min heap free percentage size: %s\n", 2412 option->optionString); 2413 return JNI_EINVAL; 2414 } else { 2415 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2416 } 2417 // -Xss 2418 } else if (match_option(option, "-Xss", &tail)) { 2419 julong long_ThreadStackSize = 0; 2420 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2421 if (errcode != arg_in_range) { 2422 jio_fprintf(defaultStream::error_stream(), 2423 "Invalid thread stack size: %s\n", option->optionString); 2424 describe_range_error(errcode); 2425 return JNI_EINVAL; 2426 } 2427 // Internally track ThreadStackSize in units of 1024 bytes. 2428 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2429 round_to((int)long_ThreadStackSize, K) / K); 2430 // -Xoss 2431 } else if (match_option(option, "-Xoss", &tail)) { 2432 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2433 // -Xmaxjitcodesize 2434 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2435 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2436 julong long_ReservedCodeCacheSize = 0; 2437 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 2438 (size_t)InitialCodeCacheSize); 2439 if (errcode != arg_in_range) { 2440 jio_fprintf(defaultStream::error_stream(), 2441 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n", 2442 option->optionString, InitialCodeCacheSize/K); 2443 describe_range_error(errcode); 2444 return JNI_EINVAL; 2445 } 2446 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2447 // -green 2448 } else if (match_option(option, "-green", &tail)) { 2449 jio_fprintf(defaultStream::error_stream(), 2450 "Green threads support not available\n"); 2451 return JNI_EINVAL; 2452 // -native 2453 } else if (match_option(option, "-native", &tail)) { 2454 // HotSpot always uses native threads, ignore silently for compatibility 2455 // -Xsqnopause 2456 } else if (match_option(option, "-Xsqnopause", &tail)) { 2457 // EVM option, ignore silently for compatibility 2458 // -Xrs 2459 } else if (match_option(option, "-Xrs", &tail)) { 2460 // Classic/EVM option, new functionality 2461 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2462 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2463 // change default internal VM signals used - lower case for back compat 2464 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2465 // -Xoptimize 2466 } else if (match_option(option, "-Xoptimize", &tail)) { 2467 // EVM option, ignore silently for compatibility 2468 // -Xprof 2469 } else if (match_option(option, "-Xprof", &tail)) { 2470#if INCLUDE_FPROF 2471 _has_profile = true; 2472#else // INCLUDE_FPROF 2473 jio_fprintf(defaultStream::error_stream(), 2474 "Flat profiling is not supported in this VM.\n"); 2475 return JNI_ERR; 2476#endif // INCLUDE_FPROF 2477 // -Xaprof 2478 } else if (match_option(option, "-Xaprof", &tail)) { 2479 _has_alloc_profile = true; 2480 // -Xconcurrentio 2481 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2482 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2483 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2484 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2485 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2486 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2487 2488 // -Xinternalversion 2489 } else if (match_option(option, "-Xinternalversion", &tail)) { 2490 jio_fprintf(defaultStream::output_stream(), "%s\n", 2491 VM_Version::internal_vm_info_string()); 2492 vm_exit(0); 2493#ifndef PRODUCT 2494 // -Xprintflags 2495 } else if (match_option(option, "-Xprintflags", &tail)) { 2496 CommandLineFlags::printFlags(tty, false); 2497 vm_exit(0); 2498#endif 2499 // -D 2500 } else if (match_option(option, "-D", &tail)) { 2501 if (!add_property(tail)) { 2502 return JNI_ENOMEM; 2503 } 2504 // Out of the box management support 2505 if (match_option(option, "-Dcom.sun.management", &tail)) { 2506#if INCLUDE_MANAGEMENT 2507 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2508#else 2509 jio_fprintf(defaultStream::output_stream(), 2510 "-Dcom.sun.management is not supported in this VM.\n"); 2511 return JNI_ERR; 2512#endif 2513 } 2514 // -Xint 2515 } else if (match_option(option, "-Xint", &tail)) { 2516 set_mode_flags(_int); 2517 // -Xmixed 2518 } else if (match_option(option, "-Xmixed", &tail)) { 2519 set_mode_flags(_mixed); 2520 // -Xcomp 2521 } else if (match_option(option, "-Xcomp", &tail)) { 2522 // for testing the compiler; turn off all flags that inhibit compilation 2523 set_mode_flags(_comp); 2524 // -Xshare:dump 2525 } else if (match_option(option, "-Xshare:dump", &tail)) { 2526 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2527 set_mode_flags(_int); // Prevent compilation, which creates objects 2528 // -Xshare:on 2529 } else if (match_option(option, "-Xshare:on", &tail)) { 2530 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2531 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2532 // -Xshare:auto 2533 } else if (match_option(option, "-Xshare:auto", &tail)) { 2534 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2535 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2536 // -Xshare:off 2537 } else if (match_option(option, "-Xshare:off", &tail)) { 2538 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2539 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2540 // -Xverify 2541 } else if (match_option(option, "-Xverify", &tail)) { 2542 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2543 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2544 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2545 } else if (strcmp(tail, ":remote") == 0) { 2546 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2547 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2548 } else if (strcmp(tail, ":none") == 0) { 2549 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2550 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2551 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2552 return JNI_EINVAL; 2553 } 2554 // -Xdebug 2555 } else if (match_option(option, "-Xdebug", &tail)) { 2556 // note this flag has been used, then ignore 2557 set_xdebug_mode(true); 2558 // -Xnoagent 2559 } else if (match_option(option, "-Xnoagent", &tail)) { 2560 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2561 } else if (match_option(option, "-Xboundthreads", &tail)) { 2562 // Bind user level threads to kernel threads (Solaris only) 2563 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2564 } else if (match_option(option, "-Xloggc:", &tail)) { 2565 // Redirect GC output to the file. -Xloggc:<filename> 2566 // ostream_init_log(), when called will use this filename 2567 // to initialize a fileStream. 2568 _gc_log_filename = strdup(tail); 2569 FLAG_SET_CMDLINE(bool, PrintGC, true); 2570 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2571 2572 // JNI hooks 2573 } else if (match_option(option, "-Xcheck", &tail)) { 2574 if (!strcmp(tail, ":jni")) { 2575#if !INCLUDE_JNI_CHECK 2576 warning("JNI CHECKING is not supported in this VM"); 2577#else 2578 CheckJNICalls = true; 2579#endif // INCLUDE_JNI_CHECK 2580 } else if (is_bad_option(option, args->ignoreUnrecognized, 2581 "check")) { 2582 return JNI_EINVAL; 2583 } 2584 } else if (match_option(option, "vfprintf", &tail)) { 2585 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2586 } else if (match_option(option, "exit", &tail)) { 2587 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2588 } else if (match_option(option, "abort", &tail)) { 2589 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2590 // -XX:+AggressiveHeap 2591 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2592 2593 // This option inspects the machine and attempts to set various 2594 // parameters to be optimal for long-running, memory allocation 2595 // intensive jobs. It is intended for machines with large 2596 // amounts of cpu and memory. 2597 2598 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2599 // VM, but we may not be able to represent the total physical memory 2600 // available (like having 8gb of memory on a box but using a 32bit VM). 2601 // Thus, we need to make sure we're using a julong for intermediate 2602 // calculations. 2603 julong initHeapSize; 2604 julong total_memory = os::physical_memory(); 2605 2606 if (total_memory < (julong)256*M) { 2607 jio_fprintf(defaultStream::error_stream(), 2608 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2609 vm_exit(1); 2610 } 2611 2612 // The heap size is half of available memory, or (at most) 2613 // all of possible memory less 160mb (leaving room for the OS 2614 // when using ISM). This is the maximum; because adaptive sizing 2615 // is turned on below, the actual space used may be smaller. 2616 2617 initHeapSize = MIN2(total_memory / (julong)2, 2618 total_memory - (julong)160*M); 2619 2620 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2621 2622 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2623 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2624 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2625 // Currently the minimum size and the initial heap sizes are the same. 2626 set_min_heap_size(initHeapSize); 2627 } 2628 if (FLAG_IS_DEFAULT(NewSize)) { 2629 // Make the young generation 3/8ths of the total heap. 2630 FLAG_SET_CMDLINE(uintx, NewSize, 2631 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2632 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2633 } 2634 2635#ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 2636 FLAG_SET_DEFAULT(UseLargePages, true); 2637#endif 2638 2639 // Increase some data structure sizes for efficiency 2640 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2641 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2642 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2643 2644 // See the OldPLABSize comment below, but replace 'after promotion' 2645 // with 'after copying'. YoungPLABSize is the size of the survivor 2646 // space per-gc-thread buffers. The default is 4kw. 2647 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2648 2649 // OldPLABSize is the size of the buffers in the old gen that 2650 // UseParallelGC uses to promote live data that doesn't fit in the 2651 // survivor spaces. At any given time, there's one for each gc thread. 2652 // The default size is 1kw. These buffers are rarely used, since the 2653 // survivor spaces are usually big enough. For specjbb, however, there 2654 // are occasions when there's lots of live data in the young gen 2655 // and we end up promoting some of it. We don't have a definite 2656 // explanation for why bumping OldPLABSize helps, but the theory 2657 // is that a bigger PLAB results in retaining something like the 2658 // original allocation order after promotion, which improves mutator 2659 // locality. A minor effect may be that larger PLABs reduce the 2660 // number of PLAB allocation events during gc. The value of 8kw 2661 // was arrived at by experimenting with specjbb. 2662 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2663 2664 // Enable parallel GC and adaptive generation sizing 2665 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2666 FLAG_SET_DEFAULT(ParallelGCThreads, 2667 Abstract_VM_Version::parallel_worker_threads()); 2668 2669 // Encourage steady state memory management 2670 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2671 2672 // This appears to improve mutator locality 2673 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2674 2675 // Get around early Solaris scheduling bug 2676 // (affinity vs other jobs on system) 2677 // but disallow DR and offlining (5008695). 2678 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 2679 2680 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 2681 // The last option must always win. 2682 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 2683 FLAG_SET_CMDLINE(bool, NeverTenure, true); 2684 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 2685 // The last option must always win. 2686 FLAG_SET_CMDLINE(bool, NeverTenure, false); 2687 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 2688 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 2689 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 2690 jio_fprintf(defaultStream::error_stream(), 2691 "Please use CMSClassUnloadingEnabled in place of " 2692 "CMSPermGenSweepingEnabled in the future\n"); 2693 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 2694 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 2695 jio_fprintf(defaultStream::error_stream(), 2696 "Please use -XX:+UseGCOverheadLimit in place of " 2697 "-XX:+UseGCTimeLimit in the future\n"); 2698 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 2699 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 2700 jio_fprintf(defaultStream::error_stream(), 2701 "Please use -XX:-UseGCOverheadLimit in place of " 2702 "-XX:-UseGCTimeLimit in the future\n"); 2703 // The TLE options are for compatibility with 1.3 and will be 2704 // removed without notice in a future release. These options 2705 // are not to be documented. 2706 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 2707 // No longer used. 2708 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 2709 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 2710 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 2711 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2712 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 2713 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 2714 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 2715 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 2716 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 2717 // No longer used. 2718 } else if (match_option(option, "-XX:TLESize=", &tail)) { 2719 julong long_tlab_size = 0; 2720 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 2721 if (errcode != arg_in_range) { 2722 jio_fprintf(defaultStream::error_stream(), 2723 "Invalid TLAB size: %s\n", option->optionString); 2724 describe_range_error(errcode); 2725 return JNI_EINVAL; 2726 } 2727 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 2728 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 2729 // No longer used. 2730 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 2731 FLAG_SET_CMDLINE(bool, UseTLAB, true); 2732 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 2733 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2734SOLARIS_ONLY( 2735 } else if (match_option(option, "-XX:+UsePermISM", &tail)) { 2736 warning("-XX:+UsePermISM is obsolete."); 2737 FLAG_SET_CMDLINE(bool, UseISM, true); 2738 } else if (match_option(option, "-XX:-UsePermISM", &tail)) { 2739 FLAG_SET_CMDLINE(bool, UseISM, false); 2740) 2741 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 2742 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 2743 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 2744 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 2745 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 2746 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 2747 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 2748#if defined(DTRACE_ENABLED) 2749 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 2750 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 2751 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 2752 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 2753#else // defined(DTRACE_ENABLED) 2754 jio_fprintf(defaultStream::error_stream(), 2755 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 2756 return JNI_EINVAL; 2757#endif // defined(DTRACE_ENABLED) 2758#ifdef ASSERT 2759 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 2760 FLAG_SET_CMDLINE(bool, FullGCALot, true); 2761 // disable scavenge before parallel mark-compact 2762 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2763#endif 2764 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 2765 julong cms_blocks_to_claim = (julong)atol(tail); 2766 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2767 jio_fprintf(defaultStream::error_stream(), 2768 "Please use -XX:OldPLABSize in place of " 2769 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 2770 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 2771 julong cms_blocks_to_claim = (julong)atol(tail); 2772 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2773 jio_fprintf(defaultStream::error_stream(), 2774 "Please use -XX:OldPLABSize in place of " 2775 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 2776 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 2777 julong old_plab_size = 0; 2778 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 2779 if (errcode != arg_in_range) { 2780 jio_fprintf(defaultStream::error_stream(), 2781 "Invalid old PLAB size: %s\n", option->optionString); 2782 describe_range_error(errcode); 2783 return JNI_EINVAL; 2784 } 2785 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 2786 jio_fprintf(defaultStream::error_stream(), 2787 "Please use -XX:OldPLABSize in place of " 2788 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 2789 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 2790 julong young_plab_size = 0; 2791 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 2792 if (errcode != arg_in_range) { 2793 jio_fprintf(defaultStream::error_stream(), 2794 "Invalid young PLAB size: %s\n", option->optionString); 2795 describe_range_error(errcode); 2796 return JNI_EINVAL; 2797 } 2798 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 2799 jio_fprintf(defaultStream::error_stream(), 2800 "Please use -XX:YoungPLABSize in place of " 2801 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 2802 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 2803 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 2804 julong stack_size = 0; 2805 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 2806 if (errcode != arg_in_range) { 2807 jio_fprintf(defaultStream::error_stream(), 2808 "Invalid mark stack size: %s\n", option->optionString); 2809 describe_range_error(errcode); 2810 return JNI_EINVAL; 2811 } 2812 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 2813 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 2814 julong max_stack_size = 0; 2815 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 2816 if (errcode != arg_in_range) { 2817 jio_fprintf(defaultStream::error_stream(), 2818 "Invalid maximum mark stack size: %s\n", 2819 option->optionString); 2820 describe_range_error(errcode); 2821 return JNI_EINVAL; 2822 } 2823 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 2824 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 2825 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 2826 uintx conc_threads = 0; 2827 if (!parse_uintx(tail, &conc_threads, 1)) { 2828 jio_fprintf(defaultStream::error_stream(), 2829 "Invalid concurrent threads: %s\n", option->optionString); 2830 return JNI_EINVAL; 2831 } 2832 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 2833 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 2834 julong max_direct_memory_size = 0; 2835 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 2836 if (errcode != arg_in_range) { 2837 jio_fprintf(defaultStream::error_stream(), 2838 "Invalid maximum direct memory size: %s\n", 2839 option->optionString); 2840 describe_range_error(errcode); 2841 return JNI_EINVAL; 2842 } 2843 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 2844 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) { 2845 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go 2846 // away and will cause VM initialization failures! 2847 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release."); 2848 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true); 2849#if !INCLUDE_MANAGEMENT 2850 } else if (match_option(option, "-XX:+ManagementServer", &tail)) { 2851 jio_fprintf(defaultStream::error_stream(), 2852 "ManagementServer is not supported in this VM.\n"); 2853 return JNI_ERR; 2854#endif // INCLUDE_MANAGEMENT 2855 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2856 // Skip -XX:Flags= since that case has already been handled 2857 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 2858 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2859 return JNI_EINVAL; 2860 } 2861 } 2862 // Unknown option 2863 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2864 return JNI_ERR; 2865 } 2866 } 2867 2868 // Change the default value for flags which have different default values 2869 // when working with older JDKs. 2870#ifdef LINUX 2871 if (JDK_Version::current().compare_major(6) <= 0 && 2872 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 2873 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 2874 } 2875#endif // LINUX 2876 return JNI_OK; 2877} 2878 2879jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 2880 // This must be done after all -D arguments have been processed. 2881 scp_p->expand_endorsed(); 2882 2883 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 2884 // Assemble the bootclasspath elements into the final path. 2885 Arguments::set_sysclasspath(scp_p->combined_path()); 2886 } 2887 2888 // This must be done after all arguments have been processed. 2889 // java_compiler() true means set to "NONE" or empty. 2890 if (java_compiler() && !xdebug_mode()) { 2891 // For backwards compatibility, we switch to interpreted mode if 2892 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 2893 // not specified. 2894 set_mode_flags(_int); 2895 } 2896 if (CompileThreshold == 0) { 2897 set_mode_flags(_int); 2898 } 2899 2900#ifndef COMPILER2 2901 // Don't degrade server performance for footprint 2902 if (FLAG_IS_DEFAULT(UseLargePages) && 2903 MaxHeapSize < LargePageHeapSizeThreshold) { 2904 // No need for large granularity pages w/small heaps. 2905 // Note that large pages are enabled/disabled for both the 2906 // Java heap and the code cache. 2907 FLAG_SET_DEFAULT(UseLargePages, false); 2908 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false)); 2909 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false)); 2910 } 2911 2912 // Tiered compilation is undefined with C1. 2913 TieredCompilation = false; 2914#else 2915 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 2916 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 2917 } 2918#endif 2919 2920 // If we are running in a headless jre, force java.awt.headless property 2921 // to be true unless the property has already been set. 2922 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 2923 if (os::is_headless_jre()) { 2924 const char* headless = Arguments::get_property("java.awt.headless"); 2925 if (headless == NULL) { 2926 char envbuffer[128]; 2927 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 2928 if (!add_property("java.awt.headless=true")) { 2929 return JNI_ENOMEM; 2930 } 2931 } else { 2932 char buffer[256]; 2933 strcpy(buffer, "java.awt.headless="); 2934 strcat(buffer, envbuffer); 2935 if (!add_property(buffer)) { 2936 return JNI_ENOMEM; 2937 } 2938 } 2939 } 2940 } 2941 2942 if (!check_vm_args_consistency()) { 2943 return JNI_ERR; 2944 } 2945 2946 return JNI_OK; 2947} 2948 2949jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2950 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 2951 scp_assembly_required_p); 2952} 2953 2954jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2955 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 2956 scp_assembly_required_p); 2957} 2958 2959jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 2960 const int N_MAX_OPTIONS = 64; 2961 const int OPTION_BUFFER_SIZE = 1024; 2962 char buffer[OPTION_BUFFER_SIZE]; 2963 2964 // The variable will be ignored if it exceeds the length of the buffer. 2965 // Don't check this variable if user has special privileges 2966 // (e.g. unix su command). 2967 if (os::getenv(name, buffer, sizeof(buffer)) && 2968 !os::have_special_privileges()) { 2969 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 2970 jio_fprintf(defaultStream::error_stream(), 2971 "Picked up %s: %s\n", name, buffer); 2972 char* rd = buffer; // pointer to the input string (rd) 2973 int i; 2974 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 2975 while (isspace(*rd)) rd++; // skip whitespace 2976 if (*rd == 0) break; // we re done when the input string is read completely 2977 2978 // The output, option string, overwrites the input string. 2979 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 2980 // input string (rd). 2981 char* wrt = rd; 2982 2983 options[i++].optionString = wrt; // Fill in option 2984 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 2985 if (*rd == '\'' || *rd == '"') { // handle a quoted string 2986 int quote = *rd; // matching quote to look for 2987 rd++; // don't copy open quote 2988 while (*rd != quote) { // include everything (even spaces) up until quote 2989 if (*rd == 0) { // string termination means unmatched string 2990 jio_fprintf(defaultStream::error_stream(), 2991 "Unmatched quote in %s\n", name); 2992 return JNI_ERR; 2993 } 2994 *wrt++ = *rd++; // copy to option string 2995 } 2996 rd++; // don't copy close quote 2997 } else { 2998 *wrt++ = *rd++; // copy to option string 2999 } 3000 } 3001 // Need to check if we're done before writing a NULL, 3002 // because the write could be to the byte that rd is pointing to. 3003 if (*rd++ == 0) { 3004 *wrt = 0; 3005 break; 3006 } 3007 *wrt = 0; // Zero terminate option 3008 } 3009 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3010 JavaVMInitArgs vm_args; 3011 vm_args.version = JNI_VERSION_1_2; 3012 vm_args.options = options; 3013 vm_args.nOptions = i; 3014 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3015 3016 if (PrintVMOptions) { 3017 const char* tail; 3018 for (int i = 0; i < vm_args.nOptions; i++) { 3019 const JavaVMOption *option = vm_args.options + i; 3020 if (match_option(option, "-XX:", &tail)) { 3021 logOption(tail); 3022 } 3023 } 3024 } 3025 3026 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR)); 3027 } 3028 return JNI_OK; 3029} 3030 3031void Arguments::set_shared_spaces_flags() { 3032 const bool must_share = DumpSharedSpaces || RequireSharedSpaces; 3033 const bool might_share = must_share || UseSharedSpaces; 3034 3035 // CompressedOops cannot be used with CDS. The offsets of oopmaps and 3036 // static fields are incorrect in the archive. With some more clever 3037 // initialization, this restriction can probably be lifted. 3038 // ??? UseLargePages might be okay now 3039 const bool cannot_share = UseCompressedOops || 3040 (UseLargePages && FLAG_IS_CMDLINE(UseLargePages)); 3041 if (cannot_share) { 3042 if (must_share) { 3043 warning("disabling large pages %s" 3044 "because of %s", "" LP64_ONLY("and compressed oops "), 3045 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on"); 3046 FLAG_SET_CMDLINE(bool, UseLargePages, false); 3047 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false)); 3048 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false)); 3049 } else { 3050 // Prefer compressed oops and large pages to class data sharing 3051 if (UseSharedSpaces && Verbose) { 3052 warning("turning off use of shared archive because of large pages%s", 3053 "" LP64_ONLY(" and/or compressed oops")); 3054 } 3055 no_shared_spaces(); 3056 } 3057 } else if (UseLargePages && might_share) { 3058 // Disable large pages to allow shared spaces. This is sub-optimal, since 3059 // there may not even be a shared archive to use. 3060 FLAG_SET_DEFAULT(UseLargePages, false); 3061 } 3062 3063 if (DumpSharedSpaces) { 3064 if (RequireSharedSpaces) { 3065 warning("cannot dump shared archive while using shared archive"); 3066 } 3067 UseSharedSpaces = false; 3068 } 3069} 3070 3071// Disable options not supported in this release, with a warning if they 3072// were explicitly requested on the command-line 3073#define UNSUPPORTED_OPTION(opt, description) \ 3074do { \ 3075 if (opt) { \ 3076 if (FLAG_IS_CMDLINE(opt)) { \ 3077 warning(description " is disabled in this release."); \ 3078 } \ 3079 FLAG_SET_DEFAULT(opt, false); \ 3080 } \ 3081} while(0) 3082 3083 3084#define UNSUPPORTED_GC_OPTION(gc) \ 3085do { \ 3086 if (gc) { \ 3087 if (FLAG_IS_CMDLINE(gc)) { \ 3088 warning(#gc " is not supported in this VM. Using Serial GC."); \ 3089 } \ 3090 FLAG_SET_DEFAULT(gc, false); \ 3091 } \ 3092} while(0) 3093 3094static void force_serial_gc() { 3095 FLAG_SET_DEFAULT(UseSerialGC, true); 3096 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 3097 UNSUPPORTED_GC_OPTION(UseG1GC); 3098 UNSUPPORTED_GC_OPTION(UseParallelGC); 3099 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3100 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3101 UNSUPPORTED_GC_OPTION(UseParNewGC); 3102} 3103 3104// Parse entry point called from JNI_CreateJavaVM 3105 3106jint Arguments::parse(const JavaVMInitArgs* args) { 3107 3108 // Sharing support 3109 // Construct the path to the archive 3110 char jvm_path[JVM_MAXPATHLEN]; 3111 os::jvm_path(jvm_path, sizeof(jvm_path)); 3112 char *end = strrchr(jvm_path, *os::file_separator()); 3113 if (end != NULL) *end = '\0'; 3114 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) + 3115 strlen(os::file_separator()) + 20, mtInternal); 3116 if (shared_archive_path == NULL) return JNI_ENOMEM; 3117 strcpy(shared_archive_path, jvm_path); 3118 strcat(shared_archive_path, os::file_separator()); 3119 strcat(shared_archive_path, "classes"); 3120 strcat(shared_archive_path, ".jsa"); 3121 SharedArchivePath = shared_archive_path; 3122 3123 // Remaining part of option string 3124 const char* tail; 3125 3126 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3127 const char* hotspotrc = ".hotspotrc"; 3128 bool settings_file_specified = false; 3129 bool needs_hotspotrc_warning = false; 3130 3131 const char* flags_file; 3132 int index; 3133 for (index = 0; index < args->nOptions; index++) { 3134 const JavaVMOption *option = args->options + index; 3135 if (match_option(option, "-XX:Flags=", &tail)) { 3136 flags_file = tail; 3137 settings_file_specified = true; 3138 } 3139 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3140 PrintVMOptions = true; 3141 } 3142 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3143 PrintVMOptions = false; 3144 } 3145 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3146 IgnoreUnrecognizedVMOptions = true; 3147 } 3148 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3149 IgnoreUnrecognizedVMOptions = false; 3150 } 3151 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3152 CommandLineFlags::printFlags(tty, false); 3153 vm_exit(0); 3154 } 3155 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3156#if INCLUDE_NMT 3157 MemTracker::init_tracking_options(tail); 3158#else 3159 jio_fprintf(defaultStream::error_stream(), 3160 "Native Memory Tracking is not supported in this VM\n"); 3161 return JNI_ERR; 3162#endif 3163 } 3164 3165 3166#ifndef PRODUCT 3167 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3168 CommandLineFlags::printFlags(tty, true); 3169 vm_exit(0); 3170 } 3171#endif 3172 } 3173 3174 if (IgnoreUnrecognizedVMOptions) { 3175 // uncast const to modify the flag args->ignoreUnrecognized 3176 *(jboolean*)(&args->ignoreUnrecognized) = true; 3177 } 3178 3179 // Parse specified settings file 3180 if (settings_file_specified) { 3181 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3182 return JNI_EINVAL; 3183 } 3184 } else { 3185#ifdef ASSERT 3186 // Parse default .hotspotrc settings file 3187 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3188 return JNI_EINVAL; 3189 } 3190#else 3191 struct stat buf; 3192 if (os::stat(hotspotrc, &buf) == 0) { 3193 needs_hotspotrc_warning = true; 3194 } 3195#endif 3196 } 3197 3198 if (PrintVMOptions) { 3199 for (index = 0; index < args->nOptions; index++) { 3200 const JavaVMOption *option = args->options + index; 3201 if (match_option(option, "-XX:", &tail)) { 3202 logOption(tail); 3203 } 3204 } 3205 } 3206 3207 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3208 jint result = parse_vm_init_args(args); 3209 if (result != JNI_OK) { 3210 return result; 3211 } 3212 3213 // Delay warning until here so that we've had a chance to process 3214 // the -XX:-PrintWarnings flag 3215 if (needs_hotspotrc_warning) { 3216 warning("%s file is present but has been ignored. " 3217 "Run with -XX:Flags=%s to load the file.", 3218 hotspotrc, hotspotrc); 3219 } 3220 3221#ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3222 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3223#endif 3224 3225#if INCLUDE_ALL_GCS 3226 #if (defined JAVASE_EMBEDDED || defined ARM) 3227 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3228 #endif 3229#endif 3230 3231#ifndef PRODUCT 3232 if (TraceBytecodesAt != 0) { 3233 TraceBytecodes = true; 3234 } 3235 if (CountCompiledCalls) { 3236 if (UseCounterDecay) { 3237 warning("UseCounterDecay disabled because CountCalls is set"); 3238 UseCounterDecay = false; 3239 } 3240 } 3241#endif // PRODUCT 3242 3243 // JSR 292 is not supported before 1.7 3244 if (!JDK_Version::is_gte_jdk17x_version()) { 3245 if (EnableInvokeDynamic) { 3246 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3247 warning("JSR 292 is not supported before 1.7. Disabling support."); 3248 } 3249 EnableInvokeDynamic = false; 3250 } 3251 } 3252 3253 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 3254 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3255 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 3256 } 3257 ScavengeRootsInCode = 1; 3258 } 3259 3260 if (PrintGCDetails) { 3261 // Turn on -verbose:gc options as well 3262 PrintGC = true; 3263 } 3264 3265 if (!JDK_Version::is_gte_jdk18x_version()) { 3266 // To avoid changing the log format for 7 updates this flag is only 3267 // true by default in JDK8 and above. 3268 if (FLAG_IS_DEFAULT(PrintGCCause)) { 3269 FLAG_SET_DEFAULT(PrintGCCause, false); 3270 } 3271 } 3272 3273 // Set object alignment values. 3274 set_object_alignment(); 3275 3276#if !INCLUDE_ALL_GCS 3277 force_serial_gc(); 3278#endif // INCLUDE_ALL_GCS 3279#if !INCLUDE_CDS 3280 if (DumpSharedSpaces || RequireSharedSpaces) { 3281 jio_fprintf(defaultStream::error_stream(), 3282 "Shared spaces are not supported in this VM\n"); 3283 return JNI_ERR; 3284 } 3285 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3286 warning("Shared spaces are not supported in this VM"); 3287 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3288 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3289 } 3290 no_shared_spaces(); 3291#endif // INCLUDE_CDS 3292 3293 // Set flags based on ergonomics. 3294 set_ergonomics_flags(); 3295 3296 set_shared_spaces_flags(); 3297 3298 // Check the GC selections again. 3299 if (!check_gc_consistency()) { 3300 return JNI_EINVAL; 3301 } 3302 3303 if (TieredCompilation) { 3304 set_tiered_flags(); 3305 } else { 3306 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3307 if (CompilationPolicyChoice >= 2) { 3308 vm_exit_during_initialization( 3309 "Incompatible compilation policy selected", NULL); 3310 } 3311 } 3312 3313 // Set heap size based on available physical memory 3314 set_heap_size(); 3315 3316#if INCLUDE_ALL_GCS 3317 // Set per-collector flags 3318 if (UseParallelGC || UseParallelOldGC) { 3319 set_parallel_gc_flags(); 3320 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below 3321 set_cms_and_parnew_gc_flags(); 3322 } else if (UseParNewGC) { // skipped if CMS is set above 3323 set_parnew_gc_flags(); 3324 } else if (UseG1GC) { 3325 set_g1_gc_flags(); 3326 } 3327 check_deprecated_gcs(); 3328 check_deprecated_gc_flags(); 3329#else // INCLUDE_ALL_GCS 3330 assert(verify_serial_gc_flags(), "SerialGC unset"); 3331#endif // INCLUDE_ALL_GCS 3332 3333 // Set bytecode rewriting flags 3334 set_bytecode_flags(); 3335 3336 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 3337 set_aggressive_opts_flags(); 3338 3339 // Turn off biased locking for locking debug mode flags, 3340 // which are subtlely different from each other but neither works with 3341 // biased locking. 3342 if (UseHeavyMonitors 3343#ifdef COMPILER1 3344 || !UseFastLocking 3345#endif // COMPILER1 3346 ) { 3347 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3348 // flag set to true on command line; warn the user that they 3349 // can't enable biased locking here 3350 warning("Biased Locking is not supported with locking debug flags" 3351 "; ignoring UseBiasedLocking flag." ); 3352 } 3353 UseBiasedLocking = false; 3354 } 3355 3356#ifdef CC_INTERP 3357 // Clear flags not supported by the C++ interpreter 3358 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3359 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3360 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3361 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false)); 3362#endif // CC_INTERP 3363 3364#ifdef COMPILER2 3365 if (!UseBiasedLocking || EmitSync != 0) { 3366 UseOptoBiasInlining = false; 3367 } 3368 if (!EliminateLocks) { 3369 EliminateNestedLocks = false; 3370 } 3371 if (!Inline) { 3372 IncrementalInline = false; 3373 } 3374#ifndef PRODUCT 3375 if (!IncrementalInline) { 3376 AlwaysIncrementalInline = false; 3377 } 3378#endif 3379 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) { 3380 // incremental inlining: bump MaxNodeLimit 3381 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000); 3382 } 3383#endif 3384 3385 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3386 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3387 DebugNonSafepoints = true; 3388 } 3389 3390#ifndef PRODUCT 3391 if (CompileTheWorld) { 3392 // Force NmethodSweeper to sweep whole CodeCache each time. 3393 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3394 NmethodSweepFraction = 1; 3395 } 3396 } 3397#endif 3398 3399 if (PrintCommandLineFlags) { 3400 CommandLineFlags::printSetFlags(tty); 3401 } 3402 3403 // Apply CPU specific policy for the BiasedLocking 3404 if (UseBiasedLocking) { 3405 if (!VM_Version::use_biased_locking() && 3406 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3407 UseBiasedLocking = false; 3408 } 3409 } 3410 3411 // set PauseAtExit if the gamma launcher was used and a debugger is attached 3412 // but only if not already set on the commandline 3413 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) { 3414 bool set = false; 3415 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set); 3416 if (!set) { 3417 FLAG_SET_DEFAULT(PauseAtExit, true); 3418 } 3419 } 3420 3421 return JNI_OK; 3422} 3423 3424jint Arguments::adjust_after_os() { 3425#if INCLUDE_ALL_GCS 3426 if (UseParallelGC || UseParallelOldGC) { 3427 if (UseNUMA) { 3428 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3429 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3430 } 3431 // For those collectors or operating systems (eg, Windows) that do 3432 // not support full UseNUMA, we will map to UseNUMAInterleaving for now 3433 UseNUMAInterleaving = true; 3434 } 3435 } 3436#endif // INCLUDE_ALL_GCS 3437 return JNI_OK; 3438} 3439 3440int Arguments::PropertyList_count(SystemProperty* pl) { 3441 int count = 0; 3442 while(pl != NULL) { 3443 count++; 3444 pl = pl->next(); 3445 } 3446 return count; 3447} 3448 3449const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3450 assert(key != NULL, "just checking"); 3451 SystemProperty* prop; 3452 for (prop = pl; prop != NULL; prop = prop->next()) { 3453 if (strcmp(key, prop->key()) == 0) return prop->value(); 3454 } 3455 return NULL; 3456} 3457 3458const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3459 int count = 0; 3460 const char* ret_val = NULL; 3461 3462 while(pl != NULL) { 3463 if(count >= index) { 3464 ret_val = pl->key(); 3465 break; 3466 } 3467 count++; 3468 pl = pl->next(); 3469 } 3470 3471 return ret_val; 3472} 3473 3474char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3475 int count = 0; 3476 char* ret_val = NULL; 3477 3478 while(pl != NULL) { 3479 if(count >= index) { 3480 ret_val = pl->value(); 3481 break; 3482 } 3483 count++; 3484 pl = pl->next(); 3485 } 3486 3487 return ret_val; 3488} 3489 3490void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3491 SystemProperty* p = *plist; 3492 if (p == NULL) { 3493 *plist = new_p; 3494 } else { 3495 while (p->next() != NULL) { 3496 p = p->next(); 3497 } 3498 p->set_next(new_p); 3499 } 3500} 3501 3502void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3503 if (plist == NULL) 3504 return; 3505 3506 SystemProperty* new_p = new SystemProperty(k, v, true); 3507 PropertyList_add(plist, new_p); 3508} 3509 3510// This add maintains unique property key in the list. 3511void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3512 if (plist == NULL) 3513 return; 3514 3515 // If property key exist then update with new value. 3516 SystemProperty* prop; 3517 for (prop = *plist; prop != NULL; prop = prop->next()) { 3518 if (strcmp(k, prop->key()) == 0) { 3519 if (append) { 3520 prop->append_value(v); 3521 } else { 3522 prop->set_value(v); 3523 } 3524 return; 3525 } 3526 } 3527 3528 PropertyList_add(plist, k, v); 3529} 3530 3531// Copies src into buf, replacing "%%" with "%" and "%p" with pid 3532// Returns true if all of the source pointed by src has been copied over to 3533// the destination buffer pointed by buf. Otherwise, returns false. 3534// Notes: 3535// 1. If the length (buflen) of the destination buffer excluding the 3536// NULL terminator character is not long enough for holding the expanded 3537// pid characters, it also returns false instead of returning the partially 3538// expanded one. 3539// 2. The passed in "buflen" should be large enough to hold the null terminator. 3540bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3541 char* buf, size_t buflen) { 3542 const char* p = src; 3543 char* b = buf; 3544 const char* src_end = &src[srclen]; 3545 char* buf_end = &buf[buflen - 1]; 3546 3547 while (p < src_end && b < buf_end) { 3548 if (*p == '%') { 3549 switch (*(++p)) { 3550 case '%': // "%%" ==> "%" 3551 *b++ = *p++; 3552 break; 3553 case 'p': { // "%p" ==> current process id 3554 // buf_end points to the character before the last character so 3555 // that we could write '\0' to the end of the buffer. 3556 size_t buf_sz = buf_end - b + 1; 3557 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3558 3559 // if jio_snprintf fails or the buffer is not long enough to hold 3560 // the expanded pid, returns false. 3561 if (ret < 0 || ret >= (int)buf_sz) { 3562 return false; 3563 } else { 3564 b += ret; 3565 assert(*b == '\0', "fail in copy_expand_pid"); 3566 if (p == src_end && b == buf_end + 1) { 3567 // reach the end of the buffer. 3568 return true; 3569 } 3570 } 3571 p++; 3572 break; 3573 } 3574 default : 3575 *b++ = '%'; 3576 } 3577 } else { 3578 *b++ = *p++; 3579 } 3580 } 3581 *b = '\0'; 3582 return (p == src_end); // return false if not all of the source was copied 3583} 3584