arguments.cpp revision 6014:8a9bb7821e28
1/* 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "precompiled.hpp" 26#include "classfile/javaAssertions.hpp" 27#include "classfile/symbolTable.hpp" 28#include "compiler/compilerOracle.hpp" 29#include "memory/allocation.inline.hpp" 30#include "memory/cardTableRS.hpp" 31#include "memory/genCollectedHeap.hpp" 32#include "memory/referenceProcessor.hpp" 33#include "memory/universe.inline.hpp" 34#include "oops/oop.inline.hpp" 35#include "prims/jvmtiExport.hpp" 36#include "runtime/arguments.hpp" 37#include "runtime/globals_extension.hpp" 38#include "runtime/java.hpp" 39#include "services/management.hpp" 40#include "services/memTracker.hpp" 41#include "utilities/defaultStream.hpp" 42#include "utilities/macros.hpp" 43#include "utilities/taskqueue.hpp" 44#ifdef TARGET_OS_FAMILY_linux 45# include "os_linux.inline.hpp" 46#endif 47#ifdef TARGET_OS_FAMILY_solaris 48# include "os_solaris.inline.hpp" 49#endif 50#ifdef TARGET_OS_FAMILY_windows 51# include "os_windows.inline.hpp" 52#endif 53#ifdef TARGET_OS_FAMILY_aix 54# include "os_aix.inline.hpp" 55#endif 56#ifdef TARGET_OS_FAMILY_bsd 57# include "os_bsd.inline.hpp" 58#endif 59#if INCLUDE_ALL_GCS 60#include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 61#include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 62#include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 63#endif // INCLUDE_ALL_GCS 64 65// Note: This is a special bug reporting site for the JVM 66#define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp" 67#define DEFAULT_JAVA_LAUNCHER "generic" 68 69// Disable options not supported in this release, with a warning if they 70// were explicitly requested on the command-line 71#define UNSUPPORTED_OPTION(opt, description) \ 72do { \ 73 if (opt) { \ 74 if (FLAG_IS_CMDLINE(opt)) { \ 75 warning(description " is disabled in this release."); \ 76 } \ 77 FLAG_SET_DEFAULT(opt, false); \ 78 } \ 79} while(0) 80 81#define UNSUPPORTED_GC_OPTION(gc) \ 82do { \ 83 if (gc) { \ 84 if (FLAG_IS_CMDLINE(gc)) { \ 85 warning(#gc " is not supported in this VM. Using Serial GC."); \ 86 } \ 87 FLAG_SET_DEFAULT(gc, false); \ 88 } \ 89} while(0) 90 91char** Arguments::_jvm_flags_array = NULL; 92int Arguments::_num_jvm_flags = 0; 93char** Arguments::_jvm_args_array = NULL; 94int Arguments::_num_jvm_args = 0; 95char* Arguments::_java_command = NULL; 96SystemProperty* Arguments::_system_properties = NULL; 97const char* Arguments::_gc_log_filename = NULL; 98bool Arguments::_has_profile = false; 99size_t Arguments::_conservative_max_heap_alignment = 0; 100uintx Arguments::_min_heap_size = 0; 101Arguments::Mode Arguments::_mode = _mixed; 102bool Arguments::_java_compiler = false; 103bool Arguments::_xdebug_mode = false; 104const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 105const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 106int Arguments::_sun_java_launcher_pid = -1; 107bool Arguments::_sun_java_launcher_is_altjvm = false; 108 109// These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 110bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 111bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 112bool Arguments::_BackgroundCompilation = BackgroundCompilation; 113bool Arguments::_ClipInlining = ClipInlining; 114 115char* Arguments::SharedArchivePath = NULL; 116 117AgentLibraryList Arguments::_libraryList; 118AgentLibraryList Arguments::_agentList; 119 120abort_hook_t Arguments::_abort_hook = NULL; 121exit_hook_t Arguments::_exit_hook = NULL; 122vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 123 124 125SystemProperty *Arguments::_java_ext_dirs = NULL; 126SystemProperty *Arguments::_java_endorsed_dirs = NULL; 127SystemProperty *Arguments::_sun_boot_library_path = NULL; 128SystemProperty *Arguments::_java_library_path = NULL; 129SystemProperty *Arguments::_java_home = NULL; 130SystemProperty *Arguments::_java_class_path = NULL; 131SystemProperty *Arguments::_sun_boot_class_path = NULL; 132 133char* Arguments::_meta_index_path = NULL; 134char* Arguments::_meta_index_dir = NULL; 135 136// Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 137 138static bool match_option(const JavaVMOption *option, const char* name, 139 const char** tail) { 140 int len = (int)strlen(name); 141 if (strncmp(option->optionString, name, len) == 0) { 142 *tail = option->optionString + len; 143 return true; 144 } else { 145 return false; 146 } 147} 148 149static void logOption(const char* opt) { 150 if (PrintVMOptions) { 151 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 152 } 153} 154 155// Process java launcher properties. 156void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 157 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 158 // sun.java.launcher.pid is defined. 159 // Must do this before setting up other system properties, 160 // as some of them may depend on launcher type. 161 for (int index = 0; index < args->nOptions; index++) { 162 const JavaVMOption* option = args->options + index; 163 const char* tail; 164 165 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 166 process_java_launcher_argument(tail, option->extraInfo); 167 continue; 168 } 169 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 170 if (strcmp(tail, "true") == 0) { 171 _sun_java_launcher_is_altjvm = true; 172 } 173 continue; 174 } 175 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 176 _sun_java_launcher_pid = atoi(tail); 177 continue; 178 } 179 } 180} 181 182// Initialize system properties key and value. 183void Arguments::init_system_properties() { 184 185 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 186 "Java Virtual Machine Specification", false)); 187 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 188 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 189 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 190 191 // Following are JVMTI agent writable properties. 192 // Properties values are set to NULL and they are 193 // os specific they are initialized in os::init_system_properties_values(). 194 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 195 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 196 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 197 _java_library_path = new SystemProperty("java.library.path", NULL, true); 198 _java_home = new SystemProperty("java.home", NULL, true); 199 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 200 201 _java_class_path = new SystemProperty("java.class.path", "", true); 202 203 // Add to System Property list. 204 PropertyList_add(&_system_properties, _java_ext_dirs); 205 PropertyList_add(&_system_properties, _java_endorsed_dirs); 206 PropertyList_add(&_system_properties, _sun_boot_library_path); 207 PropertyList_add(&_system_properties, _java_library_path); 208 PropertyList_add(&_system_properties, _java_home); 209 PropertyList_add(&_system_properties, _java_class_path); 210 PropertyList_add(&_system_properties, _sun_boot_class_path); 211 212 // Set OS specific system properties values 213 os::init_system_properties_values(); 214} 215 216 217 // Update/Initialize System properties after JDK version number is known 218void Arguments::init_version_specific_system_properties() { 219 enum { bufsz = 16 }; 220 char buffer[bufsz]; 221 const char* spec_vendor = "Sun Microsystems Inc."; 222 uint32_t spec_version = 0; 223 224 if (JDK_Version::is_gte_jdk17x_version()) { 225 spec_vendor = "Oracle Corporation"; 226 spec_version = JDK_Version::current().major_version(); 227 } 228 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 229 230 PropertyList_add(&_system_properties, 231 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 232 PropertyList_add(&_system_properties, 233 new SystemProperty("java.vm.specification.version", buffer, false)); 234 PropertyList_add(&_system_properties, 235 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 236} 237 238/** 239 * Provide a slightly more user-friendly way of eliminating -XX flags. 240 * When a flag is eliminated, it can be added to this list in order to 241 * continue accepting this flag on the command-line, while issuing a warning 242 * and ignoring the value. Once the JDK version reaches the 'accept_until' 243 * limit, we flatly refuse to admit the existence of the flag. This allows 244 * a flag to die correctly over JDK releases using HSX. 245 */ 246typedef struct { 247 const char* name; 248 JDK_Version obsoleted_in; // when the flag went away 249 JDK_Version accept_until; // which version to start denying the existence 250} ObsoleteFlag; 251 252static ObsoleteFlag obsolete_jvm_flags[] = { 253 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 254 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 255 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 256 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 257 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 258 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 259 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 260 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 261 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 262 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 263 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 264 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 265 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 266 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 267 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 268 { "DefaultInitialRAMFraction", 269 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 270 { "UseDepthFirstScavengeOrder", 271 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 272 { "HandlePromotionFailure", 273 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 274 { "MaxLiveObjectEvacuationRatio", 275 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 276 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 277 { "UseParallelOldGCCompacting", 278 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 279 { "UseParallelDensePrefixUpdate", 280 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 281 { "UseParallelOldGCDensePrefix", 282 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 283 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 284 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 285 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 286 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 287 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 288 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 289 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 290 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 291 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 292 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 293 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 294 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 295 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 296 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 297 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 298 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 299 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 300 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 301 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 302 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 303 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 304#ifdef PRODUCT 305 { "DesiredMethodLimit", 306 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 307#endif // PRODUCT 308 { NULL, JDK_Version(0), JDK_Version(0) } 309}; 310 311// Returns true if the flag is obsolete and fits into the range specified 312// for being ignored. In the case that the flag is ignored, the 'version' 313// value is filled in with the version number when the flag became 314// obsolete so that that value can be displayed to the user. 315bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 316 int i = 0; 317 assert(version != NULL, "Must provide a version buffer"); 318 while (obsolete_jvm_flags[i].name != NULL) { 319 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 320 // <flag>=xxx form 321 // [-|+]<flag> form 322 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 323 ((s[0] == '+' || s[0] == '-') && 324 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 325 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 326 *version = flag_status.obsoleted_in; 327 return true; 328 } 329 } 330 i++; 331 } 332 return false; 333} 334 335// Constructs the system class path (aka boot class path) from the following 336// components, in order: 337// 338// prefix // from -Xbootclasspath/p:... 339// endorsed // the expansion of -Djava.endorsed.dirs=... 340// base // from os::get_system_properties() or -Xbootclasspath= 341// suffix // from -Xbootclasspath/a:... 342// 343// java.endorsed.dirs is a list of directories; any jar or zip files in the 344// directories are added to the sysclasspath just before the base. 345// 346// This could be AllStatic, but it isn't needed after argument processing is 347// complete. 348class SysClassPath: public StackObj { 349public: 350 SysClassPath(const char* base); 351 ~SysClassPath(); 352 353 inline void set_base(const char* base); 354 inline void add_prefix(const char* prefix); 355 inline void add_suffix_to_prefix(const char* suffix); 356 inline void add_suffix(const char* suffix); 357 inline void reset_path(const char* base); 358 359 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 360 // property. Must be called after all command-line arguments have been 361 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 362 // combined_path(). 363 void expand_endorsed(); 364 365 inline const char* get_base() const { return _items[_scp_base]; } 366 inline const char* get_prefix() const { return _items[_scp_prefix]; } 367 inline const char* get_suffix() const { return _items[_scp_suffix]; } 368 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 369 370 // Combine all the components into a single c-heap-allocated string; caller 371 // must free the string if/when no longer needed. 372 char* combined_path(); 373 374private: 375 // Utility routines. 376 static char* add_to_path(const char* path, const char* str, bool prepend); 377 static char* add_jars_to_path(char* path, const char* directory); 378 379 inline void reset_item_at(int index); 380 381 // Array indices for the items that make up the sysclasspath. All except the 382 // base are allocated in the C heap and freed by this class. 383 enum { 384 _scp_prefix, // from -Xbootclasspath/p:... 385 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 386 _scp_base, // the default sysclasspath 387 _scp_suffix, // from -Xbootclasspath/a:... 388 _scp_nitems // the number of items, must be last. 389 }; 390 391 const char* _items[_scp_nitems]; 392 DEBUG_ONLY(bool _expansion_done;) 393}; 394 395SysClassPath::SysClassPath(const char* base) { 396 memset(_items, 0, sizeof(_items)); 397 _items[_scp_base] = base; 398 DEBUG_ONLY(_expansion_done = false;) 399} 400 401SysClassPath::~SysClassPath() { 402 // Free everything except the base. 403 for (int i = 0; i < _scp_nitems; ++i) { 404 if (i != _scp_base) reset_item_at(i); 405 } 406 DEBUG_ONLY(_expansion_done = false;) 407} 408 409inline void SysClassPath::set_base(const char* base) { 410 _items[_scp_base] = base; 411} 412 413inline void SysClassPath::add_prefix(const char* prefix) { 414 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 415} 416 417inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 418 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 419} 420 421inline void SysClassPath::add_suffix(const char* suffix) { 422 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 423} 424 425inline void SysClassPath::reset_item_at(int index) { 426 assert(index < _scp_nitems && index != _scp_base, "just checking"); 427 if (_items[index] != NULL) { 428 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 429 _items[index] = NULL; 430 } 431} 432 433inline void SysClassPath::reset_path(const char* base) { 434 // Clear the prefix and suffix. 435 reset_item_at(_scp_prefix); 436 reset_item_at(_scp_suffix); 437 set_base(base); 438} 439 440//------------------------------------------------------------------------------ 441 442void SysClassPath::expand_endorsed() { 443 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 444 445 const char* path = Arguments::get_property("java.endorsed.dirs"); 446 if (path == NULL) { 447 path = Arguments::get_endorsed_dir(); 448 assert(path != NULL, "no default for java.endorsed.dirs"); 449 } 450 451 char* expanded_path = NULL; 452 const char separator = *os::path_separator(); 453 const char* const end = path + strlen(path); 454 while (path < end) { 455 const char* tmp_end = strchr(path, separator); 456 if (tmp_end == NULL) { 457 expanded_path = add_jars_to_path(expanded_path, path); 458 path = end; 459 } else { 460 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 461 memcpy(dirpath, path, tmp_end - path); 462 dirpath[tmp_end - path] = '\0'; 463 expanded_path = add_jars_to_path(expanded_path, dirpath); 464 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 465 path = tmp_end + 1; 466 } 467 } 468 _items[_scp_endorsed] = expanded_path; 469 DEBUG_ONLY(_expansion_done = true;) 470} 471 472// Combine the bootclasspath elements, some of which may be null, into a single 473// c-heap-allocated string. 474char* SysClassPath::combined_path() { 475 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 476 assert(_expansion_done, "must call expand_endorsed() first."); 477 478 size_t lengths[_scp_nitems]; 479 size_t total_len = 0; 480 481 const char separator = *os::path_separator(); 482 483 // Get the lengths. 484 int i; 485 for (i = 0; i < _scp_nitems; ++i) { 486 if (_items[i] != NULL) { 487 lengths[i] = strlen(_items[i]); 488 // Include space for the separator char (or a NULL for the last item). 489 total_len += lengths[i] + 1; 490 } 491 } 492 assert(total_len > 0, "empty sysclasspath not allowed"); 493 494 // Copy the _items to a single string. 495 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 496 char* cp_tmp = cp; 497 for (i = 0; i < _scp_nitems; ++i) { 498 if (_items[i] != NULL) { 499 memcpy(cp_tmp, _items[i], lengths[i]); 500 cp_tmp += lengths[i]; 501 *cp_tmp++ = separator; 502 } 503 } 504 *--cp_tmp = '\0'; // Replace the extra separator. 505 return cp; 506} 507 508// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 509char* 510SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 511 char *cp; 512 513 assert(str != NULL, "just checking"); 514 if (path == NULL) { 515 size_t len = strlen(str) + 1; 516 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 517 memcpy(cp, str, len); // copy the trailing null 518 } else { 519 const char separator = *os::path_separator(); 520 size_t old_len = strlen(path); 521 size_t str_len = strlen(str); 522 size_t len = old_len + str_len + 2; 523 524 if (prepend) { 525 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 526 char* cp_tmp = cp; 527 memcpy(cp_tmp, str, str_len); 528 cp_tmp += str_len; 529 *cp_tmp = separator; 530 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 531 FREE_C_HEAP_ARRAY(char, path, mtInternal); 532 } else { 533 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 534 char* cp_tmp = cp + old_len; 535 *cp_tmp = separator; 536 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 537 } 538 } 539 return cp; 540} 541 542// Scan the directory and append any jar or zip files found to path. 543// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 544char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 545 DIR* dir = os::opendir(directory); 546 if (dir == NULL) return path; 547 548 char dir_sep[2] = { '\0', '\0' }; 549 size_t directory_len = strlen(directory); 550 const char fileSep = *os::file_separator(); 551 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 552 553 /* Scan the directory for jars/zips, appending them to path. */ 554 struct dirent *entry; 555 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 556 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 557 const char* name = entry->d_name; 558 const char* ext = name + strlen(name) - 4; 559 bool isJarOrZip = ext > name && 560 (os::file_name_strcmp(ext, ".jar") == 0 || 561 os::file_name_strcmp(ext, ".zip") == 0); 562 if (isJarOrZip) { 563 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 564 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 565 path = add_to_path(path, jarpath, false); 566 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 567 } 568 } 569 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 570 os::closedir(dir); 571 return path; 572} 573 574// Parses a memory size specification string. 575static bool atomull(const char *s, julong* result) { 576 julong n = 0; 577 int args_read = sscanf(s, JULONG_FORMAT, &n); 578 if (args_read != 1) { 579 return false; 580 } 581 while (*s != '\0' && isdigit(*s)) { 582 s++; 583 } 584 // 4705540: illegal if more characters are found after the first non-digit 585 if (strlen(s) > 1) { 586 return false; 587 } 588 switch (*s) { 589 case 'T': case 't': 590 *result = n * G * K; 591 // Check for overflow. 592 if (*result/((julong)G * K) != n) return false; 593 return true; 594 case 'G': case 'g': 595 *result = n * G; 596 if (*result/G != n) return false; 597 return true; 598 case 'M': case 'm': 599 *result = n * M; 600 if (*result/M != n) return false; 601 return true; 602 case 'K': case 'k': 603 *result = n * K; 604 if (*result/K != n) return false; 605 return true; 606 case '\0': 607 *result = n; 608 return true; 609 default: 610 return false; 611 } 612} 613 614Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 615 if (size < min_size) return arg_too_small; 616 // Check that size will fit in a size_t (only relevant on 32-bit) 617 if (size > max_uintx) return arg_too_big; 618 return arg_in_range; 619} 620 621// Describe an argument out of range error 622void Arguments::describe_range_error(ArgsRange errcode) { 623 switch(errcode) { 624 case arg_too_big: 625 jio_fprintf(defaultStream::error_stream(), 626 "The specified size exceeds the maximum " 627 "representable size.\n"); 628 break; 629 case arg_too_small: 630 case arg_unreadable: 631 case arg_in_range: 632 // do nothing for now 633 break; 634 default: 635 ShouldNotReachHere(); 636 } 637} 638 639static bool set_bool_flag(char* name, bool value, Flag::Flags origin) { 640 return CommandLineFlags::boolAtPut(name, &value, origin); 641} 642 643static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 644 double v; 645 if (sscanf(value, "%lf", &v) != 1) { 646 return false; 647 } 648 649 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 650 return true; 651 } 652 return false; 653} 654 655static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 656 julong v; 657 intx intx_v; 658 bool is_neg = false; 659 // Check the sign first since atomull() parses only unsigned values. 660 if (*value == '-') { 661 if (!CommandLineFlags::intxAt(name, &intx_v)) { 662 return false; 663 } 664 value++; 665 is_neg = true; 666 } 667 if (!atomull(value, &v)) { 668 return false; 669 } 670 intx_v = (intx) v; 671 if (is_neg) { 672 intx_v = -intx_v; 673 } 674 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 675 return true; 676 } 677 uintx uintx_v = (uintx) v; 678 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 679 return true; 680 } 681 uint64_t uint64_t_v = (uint64_t) v; 682 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 683 return true; 684 } 685 return false; 686} 687 688static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 689 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 690 // Contract: CommandLineFlags always returns a pointer that needs freeing. 691 FREE_C_HEAP_ARRAY(char, value, mtInternal); 692 return true; 693} 694 695static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 696 const char* old_value = ""; 697 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 698 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 699 size_t new_len = strlen(new_value); 700 const char* value; 701 char* free_this_too = NULL; 702 if (old_len == 0) { 703 value = new_value; 704 } else if (new_len == 0) { 705 value = old_value; 706 } else { 707 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 708 // each new setting adds another LINE to the switch: 709 sprintf(buf, "%s\n%s", old_value, new_value); 710 value = buf; 711 free_this_too = buf; 712 } 713 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 714 // CommandLineFlags always returns a pointer that needs freeing. 715 FREE_C_HEAP_ARRAY(char, value, mtInternal); 716 if (free_this_too != NULL) { 717 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 718 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 719 } 720 return true; 721} 722 723bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 724 725 // range of acceptable characters spelled out for portability reasons 726#define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 727#define BUFLEN 255 728 char name[BUFLEN+1]; 729 char dummy; 730 731 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 732 return set_bool_flag(name, false, origin); 733 } 734 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 735 return set_bool_flag(name, true, origin); 736 } 737 738 char punct; 739 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 740 const char* value = strchr(arg, '=') + 1; 741 Flag* flag = Flag::find_flag(name, strlen(name)); 742 if (flag != NULL && flag->is_ccstr()) { 743 if (flag->ccstr_accumulates()) { 744 return append_to_string_flag(name, value, origin); 745 } else { 746 if (value[0] == '\0') { 747 value = NULL; 748 } 749 return set_string_flag(name, value, origin); 750 } 751 } 752 } 753 754 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 755 const char* value = strchr(arg, '=') + 1; 756 // -XX:Foo:=xxx will reset the string flag to the given value. 757 if (value[0] == '\0') { 758 value = NULL; 759 } 760 return set_string_flag(name, value, origin); 761 } 762 763#define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 764#define SIGNED_NUMBER_RANGE "[-0123456789]" 765#define NUMBER_RANGE "[0123456789]" 766 char value[BUFLEN + 1]; 767 char value2[BUFLEN + 1]; 768 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 769 // Looks like a floating-point number -- try again with more lenient format string 770 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 771 return set_fp_numeric_flag(name, value, origin); 772 } 773 } 774 775#define VALUE_RANGE "[-kmgtKMGT0123456789]" 776 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 777 return set_numeric_flag(name, value, origin); 778 } 779 780 return false; 781} 782 783void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 784 assert(bldarray != NULL, "illegal argument"); 785 786 if (arg == NULL) { 787 return; 788 } 789 790 int new_count = *count + 1; 791 792 // expand the array and add arg to the last element 793 if (*bldarray == NULL) { 794 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 795 } else { 796 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 797 } 798 (*bldarray)[*count] = strdup(arg); 799 *count = new_count; 800} 801 802void Arguments::build_jvm_args(const char* arg) { 803 add_string(&_jvm_args_array, &_num_jvm_args, arg); 804} 805 806void Arguments::build_jvm_flags(const char* arg) { 807 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 808} 809 810// utility function to return a string that concatenates all 811// strings in a given char** array 812const char* Arguments::build_resource_string(char** args, int count) { 813 if (args == NULL || count == 0) { 814 return NULL; 815 } 816 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 817 for (int i = 1; i < count; i++) { 818 length += strlen(args[i]) + 1; // add 1 for a space 819 } 820 char* s = NEW_RESOURCE_ARRAY(char, length); 821 strcpy(s, args[0]); 822 for (int j = 1; j < count; j++) { 823 strcat(s, " "); 824 strcat(s, args[j]); 825 } 826 return (const char*) s; 827} 828 829void Arguments::print_on(outputStream* st) { 830 st->print_cr("VM Arguments:"); 831 if (num_jvm_flags() > 0) { 832 st->print("jvm_flags: "); print_jvm_flags_on(st); 833 } 834 if (num_jvm_args() > 0) { 835 st->print("jvm_args: "); print_jvm_args_on(st); 836 } 837 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 838 if (_java_class_path != NULL) { 839 char* path = _java_class_path->value(); 840 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 841 } 842 st->print_cr("Launcher Type: %s", _sun_java_launcher); 843} 844 845void Arguments::print_jvm_flags_on(outputStream* st) { 846 if (_num_jvm_flags > 0) { 847 for (int i=0; i < _num_jvm_flags; i++) { 848 st->print("%s ", _jvm_flags_array[i]); 849 } 850 st->print_cr(""); 851 } 852} 853 854void Arguments::print_jvm_args_on(outputStream* st) { 855 if (_num_jvm_args > 0) { 856 for (int i=0; i < _num_jvm_args; i++) { 857 st->print("%s ", _jvm_args_array[i]); 858 } 859 st->print_cr(""); 860 } 861} 862 863bool Arguments::process_argument(const char* arg, 864 jboolean ignore_unrecognized, Flag::Flags origin) { 865 866 JDK_Version since = JDK_Version(); 867 868 if (parse_argument(arg, origin) || ignore_unrecognized) { 869 return true; 870 } 871 872 bool has_plus_minus = (*arg == '+' || *arg == '-'); 873 const char* const argname = has_plus_minus ? arg + 1 : arg; 874 if (is_newly_obsolete(arg, &since)) { 875 char version[256]; 876 since.to_string(version, sizeof(version)); 877 warning("ignoring option %s; support was removed in %s", argname, version); 878 return true; 879 } 880 881 // For locked flags, report a custom error message if available. 882 // Otherwise, report the standard unrecognized VM option. 883 884 size_t arg_len; 885 const char* equal_sign = strchr(argname, '='); 886 if (equal_sign == NULL) { 887 arg_len = strlen(argname); 888 } else { 889 arg_len = equal_sign - argname; 890 } 891 892 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 893 if (found_flag != NULL) { 894 char locked_message_buf[BUFLEN]; 895 found_flag->get_locked_message(locked_message_buf, BUFLEN); 896 if (strlen(locked_message_buf) == 0) { 897 if (found_flag->is_bool() && !has_plus_minus) { 898 jio_fprintf(defaultStream::error_stream(), 899 "Missing +/- setting for VM option '%s'\n", argname); 900 } else if (!found_flag->is_bool() && has_plus_minus) { 901 jio_fprintf(defaultStream::error_stream(), 902 "Unexpected +/- setting in VM option '%s'\n", argname); 903 } else { 904 jio_fprintf(defaultStream::error_stream(), 905 "Improperly specified VM option '%s'\n", argname); 906 } 907 } else { 908 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 909 } 910 } else { 911 jio_fprintf(defaultStream::error_stream(), 912 "Unrecognized VM option '%s'\n", argname); 913 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 914 if (fuzzy_matched != NULL) { 915 jio_fprintf(defaultStream::error_stream(), 916 "Did you mean '%s%s%s'?\n", 917 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 918 fuzzy_matched->_name, 919 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 920 } 921 } 922 923 // allow for commandline "commenting out" options like -XX:#+Verbose 924 return arg[0] == '#'; 925} 926 927bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 928 FILE* stream = fopen(file_name, "rb"); 929 if (stream == NULL) { 930 if (should_exist) { 931 jio_fprintf(defaultStream::error_stream(), 932 "Could not open settings file %s\n", file_name); 933 return false; 934 } else { 935 return true; 936 } 937 } 938 939 char token[1024]; 940 int pos = 0; 941 942 bool in_white_space = true; 943 bool in_comment = false; 944 bool in_quote = false; 945 char quote_c = 0; 946 bool result = true; 947 948 int c = getc(stream); 949 while(c != EOF && pos < (int)(sizeof(token)-1)) { 950 if (in_white_space) { 951 if (in_comment) { 952 if (c == '\n') in_comment = false; 953 } else { 954 if (c == '#') in_comment = true; 955 else if (!isspace(c)) { 956 in_white_space = false; 957 token[pos++] = c; 958 } 959 } 960 } else { 961 if (c == '\n' || (!in_quote && isspace(c))) { 962 // token ends at newline, or at unquoted whitespace 963 // this allows a way to include spaces in string-valued options 964 token[pos] = '\0'; 965 logOption(token); 966 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 967 build_jvm_flags(token); 968 pos = 0; 969 in_white_space = true; 970 in_quote = false; 971 } else if (!in_quote && (c == '\'' || c == '"')) { 972 in_quote = true; 973 quote_c = c; 974 } else if (in_quote && (c == quote_c)) { 975 in_quote = false; 976 } else { 977 token[pos++] = c; 978 } 979 } 980 c = getc(stream); 981 } 982 if (pos > 0) { 983 token[pos] = '\0'; 984 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 985 build_jvm_flags(token); 986 } 987 fclose(stream); 988 return result; 989} 990 991//============================================================================================================= 992// Parsing of properties (-D) 993 994const char* Arguments::get_property(const char* key) { 995 return PropertyList_get_value(system_properties(), key); 996} 997 998bool Arguments::add_property(const char* prop) { 999 const char* eq = strchr(prop, '='); 1000 char* key; 1001 // ns must be static--its address may be stored in a SystemProperty object. 1002 const static char ns[1] = {0}; 1003 char* value = (char *)ns; 1004 1005 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 1006 key = AllocateHeap(key_len + 1, mtInternal); 1007 strncpy(key, prop, key_len); 1008 key[key_len] = '\0'; 1009 1010 if (eq != NULL) { 1011 size_t value_len = strlen(prop) - key_len - 1; 1012 value = AllocateHeap(value_len + 1, mtInternal); 1013 strncpy(value, &prop[key_len + 1], value_len + 1); 1014 } 1015 1016 if (strcmp(key, "java.compiler") == 0) { 1017 process_java_compiler_argument(value); 1018 FreeHeap(key); 1019 if (eq != NULL) { 1020 FreeHeap(value); 1021 } 1022 return true; 1023 } else if (strcmp(key, "sun.java.command") == 0) { 1024 _java_command = value; 1025 1026 // Record value in Arguments, but let it get passed to Java. 1027 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1028 strcmp(key, "sun.java.launcher.pid") == 0) { 1029 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1030 // private and are processed in process_sun_java_launcher_properties(); 1031 // the sun.java.launcher property is passed on to the java application 1032 FreeHeap(key); 1033 if (eq != NULL) { 1034 FreeHeap(value); 1035 } 1036 return true; 1037 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1038 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1039 // its value without going through the property list or making a Java call. 1040 _java_vendor_url_bug = value; 1041 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1042 PropertyList_unique_add(&_system_properties, key, value, true); 1043 return true; 1044 } 1045 // Create new property and add at the end of the list 1046 PropertyList_unique_add(&_system_properties, key, value); 1047 return true; 1048} 1049 1050//=========================================================================================================== 1051// Setting int/mixed/comp mode flags 1052 1053void Arguments::set_mode_flags(Mode mode) { 1054 // Set up default values for all flags. 1055 // If you add a flag to any of the branches below, 1056 // add a default value for it here. 1057 set_java_compiler(false); 1058 _mode = mode; 1059 1060 // Ensure Agent_OnLoad has the correct initial values. 1061 // This may not be the final mode; mode may change later in onload phase. 1062 PropertyList_unique_add(&_system_properties, "java.vm.info", 1063 (char*)VM_Version::vm_info_string(), false); 1064 1065 UseInterpreter = true; 1066 UseCompiler = true; 1067 UseLoopCounter = true; 1068 1069#ifndef ZERO 1070 // Turn these off for mixed and comp. Leave them on for Zero. 1071 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) { 1072 UseFastAccessorMethods = (mode == _int); 1073 } 1074 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) { 1075 UseFastEmptyMethods = (mode == _int); 1076 } 1077#endif 1078 1079 // Default values may be platform/compiler dependent - 1080 // use the saved values 1081 ClipInlining = Arguments::_ClipInlining; 1082 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1083 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1084 BackgroundCompilation = Arguments::_BackgroundCompilation; 1085 1086 // Change from defaults based on mode 1087 switch (mode) { 1088 default: 1089 ShouldNotReachHere(); 1090 break; 1091 case _int: 1092 UseCompiler = false; 1093 UseLoopCounter = false; 1094 AlwaysCompileLoopMethods = false; 1095 UseOnStackReplacement = false; 1096 break; 1097 case _mixed: 1098 // same as default 1099 break; 1100 case _comp: 1101 UseInterpreter = false; 1102 BackgroundCompilation = false; 1103 ClipInlining = false; 1104 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1105 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1106 // compile a level 4 (C2) and then continue executing it. 1107 if (TieredCompilation) { 1108 Tier3InvokeNotifyFreqLog = 0; 1109 Tier4InvocationThreshold = 0; 1110 } 1111 break; 1112 } 1113} 1114 1115#if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1116// Conflict: required to use shared spaces (-Xshare:on), but 1117// incompatible command line options were chosen. 1118 1119static void no_shared_spaces() { 1120 if (RequireSharedSpaces) { 1121 jio_fprintf(defaultStream::error_stream(), 1122 "Class data sharing is inconsistent with other specified options.\n"); 1123 vm_exit_during_initialization("Unable to use shared archive.", NULL); 1124 } else { 1125 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1126 } 1127} 1128#endif 1129 1130void Arguments::set_tiered_flags() { 1131 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1132 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1133 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1134 } 1135 if (CompilationPolicyChoice < 2) { 1136 vm_exit_during_initialization( 1137 "Incompatible compilation policy selected", NULL); 1138 } 1139 // Increase the code cache size - tiered compiles a lot more. 1140 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1141 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5); 1142 } 1143 if (!UseInterpreter) { // -Xcomp 1144 Tier3InvokeNotifyFreqLog = 0; 1145 Tier4InvocationThreshold = 0; 1146 } 1147} 1148 1149#if INCLUDE_ALL_GCS 1150static void disable_adaptive_size_policy(const char* collector_name) { 1151 if (UseAdaptiveSizePolicy) { 1152 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1153 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1154 collector_name); 1155 } 1156 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1157 } 1158} 1159 1160void Arguments::set_parnew_gc_flags() { 1161 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1162 "control point invariant"); 1163 assert(UseParNewGC, "Error"); 1164 1165 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1166 disable_adaptive_size_policy("UseParNewGC"); 1167 1168 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1169 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1170 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1171 } else if (ParallelGCThreads == 0) { 1172 jio_fprintf(defaultStream::error_stream(), 1173 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1174 vm_exit(1); 1175 } 1176 1177 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1178 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1179 // we set them to 1024 and 1024. 1180 // See CR 6362902. 1181 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1182 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1183 } 1184 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1185 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1186 } 1187 1188 // AlwaysTenure flag should make ParNew promote all at first collection. 1189 // See CR 6362902. 1190 if (AlwaysTenure) { 1191 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 1192 } 1193 // When using compressed oops, we use local overflow stacks, 1194 // rather than using a global overflow list chained through 1195 // the klass word of the object's pre-image. 1196 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1197 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1198 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1199 } 1200 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1201 } 1202 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1203} 1204 1205// Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1206// sparc/solaris for certain applications, but would gain from 1207// further optimization and tuning efforts, and would almost 1208// certainly gain from analysis of platform and environment. 1209void Arguments::set_cms_and_parnew_gc_flags() { 1210 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1211 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1212 1213 // If we are using CMS, we prefer to UseParNewGC, 1214 // unless explicitly forbidden. 1215 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1216 FLAG_SET_ERGO(bool, UseParNewGC, true); 1217 } 1218 1219 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1220 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1221 1222 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1223 // as needed. 1224 if (UseParNewGC) { 1225 set_parnew_gc_flags(); 1226 } 1227 1228 size_t max_heap = align_size_down(MaxHeapSize, 1229 CardTableRS::ct_max_alignment_constraint()); 1230 1231 // Now make adjustments for CMS 1232 intx tenuring_default = (intx)6; 1233 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1234 1235 // Preferred young gen size for "short" pauses: 1236 // upper bound depends on # of threads and NewRatio. 1237 const uintx parallel_gc_threads = 1238 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1239 const size_t preferred_max_new_size_unaligned = 1240 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1241 size_t preferred_max_new_size = 1242 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1243 1244 // Unless explicitly requested otherwise, size young gen 1245 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1246 1247 // If either MaxNewSize or NewRatio is set on the command line, 1248 // assume the user is trying to set the size of the young gen. 1249 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1250 1251 // Set MaxNewSize to our calculated preferred_max_new_size unless 1252 // NewSize was set on the command line and it is larger than 1253 // preferred_max_new_size. 1254 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1255 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1256 } else { 1257 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1258 } 1259 if (PrintGCDetails && Verbose) { 1260 // Too early to use gclog_or_tty 1261 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1262 } 1263 1264 // Code along this path potentially sets NewSize and OldSize 1265 if (PrintGCDetails && Verbose) { 1266 // Too early to use gclog_or_tty 1267 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1268 " initial_heap_size: " SIZE_FORMAT 1269 " max_heap: " SIZE_FORMAT, 1270 min_heap_size(), InitialHeapSize, max_heap); 1271 } 1272 size_t min_new = preferred_max_new_size; 1273 if (FLAG_IS_CMDLINE(NewSize)) { 1274 min_new = NewSize; 1275 } 1276 if (max_heap > min_new && min_heap_size() > min_new) { 1277 // Unless explicitly requested otherwise, make young gen 1278 // at least min_new, and at most preferred_max_new_size. 1279 if (FLAG_IS_DEFAULT(NewSize)) { 1280 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1281 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1282 if (PrintGCDetails && Verbose) { 1283 // Too early to use gclog_or_tty 1284 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1285 } 1286 } 1287 // Unless explicitly requested otherwise, size old gen 1288 // so it's NewRatio x of NewSize. 1289 if (FLAG_IS_DEFAULT(OldSize)) { 1290 if (max_heap > NewSize) { 1291 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1292 if (PrintGCDetails && Verbose) { 1293 // Too early to use gclog_or_tty 1294 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1295 } 1296 } 1297 } 1298 } 1299 } 1300 // Unless explicitly requested otherwise, definitely 1301 // promote all objects surviving "tenuring_default" scavenges. 1302 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1303 FLAG_IS_DEFAULT(SurvivorRatio)) { 1304 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1305 } 1306 // If we decided above (or user explicitly requested) 1307 // `promote all' (via MaxTenuringThreshold := 0), 1308 // prefer minuscule survivor spaces so as not to waste 1309 // space for (non-existent) survivors 1310 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1311 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1312 } 1313 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1314 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1315 // This is done in order to make ParNew+CMS configuration to work 1316 // with YoungPLABSize and OldPLABSize options. 1317 // See CR 6362902. 1318 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1319 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1320 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1321 // is. In this situation let CMSParPromoteBlocksToClaim follow 1322 // the value (either from the command line or ergonomics) of 1323 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1324 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1325 } else { 1326 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1327 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1328 // we'll let it to take precedence. 1329 jio_fprintf(defaultStream::error_stream(), 1330 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1331 " options are specified for the CMS collector." 1332 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1333 } 1334 } 1335 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1336 // OldPLAB sizing manually turned off: Use a larger default setting, 1337 // unless it was manually specified. This is because a too-low value 1338 // will slow down scavenges. 1339 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1340 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1341 } 1342 } 1343 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1344 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1345 // If either of the static initialization defaults have changed, note this 1346 // modification. 1347 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1348 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1349 } 1350 if (PrintGCDetails && Verbose) { 1351 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1352 MarkStackSize / K, MarkStackSizeMax / K); 1353 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1354 } 1355} 1356#endif // INCLUDE_ALL_GCS 1357 1358void set_object_alignment() { 1359 // Object alignment. 1360 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1361 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1362 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1363 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1364 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1365 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1366 1367 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1368 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1369 1370 // Oop encoding heap max 1371 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1372 1373#if INCLUDE_ALL_GCS 1374 // Set CMS global values 1375 CompactibleFreeListSpace::set_cms_values(); 1376#endif // INCLUDE_ALL_GCS 1377} 1378 1379bool verify_object_alignment() { 1380 // Object alignment. 1381 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1382 jio_fprintf(defaultStream::error_stream(), 1383 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1384 (int)ObjectAlignmentInBytes); 1385 return false; 1386 } 1387 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1388 jio_fprintf(defaultStream::error_stream(), 1389 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1390 (int)ObjectAlignmentInBytes, BytesPerLong); 1391 return false; 1392 } 1393 // It does not make sense to have big object alignment 1394 // since a space lost due to alignment will be greater 1395 // then a saved space from compressed oops. 1396 if ((int)ObjectAlignmentInBytes > 256) { 1397 jio_fprintf(defaultStream::error_stream(), 1398 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1399 (int)ObjectAlignmentInBytes); 1400 return false; 1401 } 1402 // In case page size is very small. 1403 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1404 jio_fprintf(defaultStream::error_stream(), 1405 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1406 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1407 return false; 1408 } 1409 return true; 1410} 1411 1412uintx Arguments::max_heap_for_compressed_oops() { 1413 // Avoid sign flip. 1414 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1415 // We need to fit both the NULL page and the heap into the memory budget, while 1416 // keeping alignment constraints of the heap. To guarantee the latter, as the 1417 // NULL page is located before the heap, we pad the NULL page to the conservative 1418 // maximum alignment that the GC may ever impose upon the heap. 1419 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1420 _conservative_max_heap_alignment); 1421 1422 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1423 NOT_LP64(ShouldNotReachHere(); return 0); 1424} 1425 1426bool Arguments::should_auto_select_low_pause_collector() { 1427 if (UseAutoGCSelectPolicy && 1428 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1429 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1430 if (PrintGCDetails) { 1431 // Cannot use gclog_or_tty yet. 1432 tty->print_cr("Automatic selection of the low pause collector" 1433 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1434 } 1435 return true; 1436 } 1437 return false; 1438} 1439 1440void Arguments::set_use_compressed_oops() { 1441#ifndef ZERO 1442#ifdef _LP64 1443 // MaxHeapSize is not set up properly at this point, but 1444 // the only value that can override MaxHeapSize if we are 1445 // to use UseCompressedOops is InitialHeapSize. 1446 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1447 1448 if (max_heap_size <= max_heap_for_compressed_oops()) { 1449#if !defined(COMPILER1) || defined(TIERED) 1450 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1451 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1452 } 1453#endif 1454#ifdef _WIN64 1455 if (UseLargePages && UseCompressedOops) { 1456 // Cannot allocate guard pages for implicit checks in indexed addressing 1457 // mode, when large pages are specified on windows. 1458 // This flag could be switched ON if narrow oop base address is set to 0, 1459 // see code in Universe::initialize_heap(). 1460 Universe::set_narrow_oop_use_implicit_null_checks(false); 1461 } 1462#endif // _WIN64 1463 } else { 1464 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1465 warning("Max heap size too large for Compressed Oops"); 1466 FLAG_SET_DEFAULT(UseCompressedOops, false); 1467 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1468 } 1469 } 1470#endif // _LP64 1471#endif // ZERO 1472} 1473 1474 1475// NOTE: set_use_compressed_klass_ptrs() must be called after calling 1476// set_use_compressed_oops(). 1477void Arguments::set_use_compressed_klass_ptrs() { 1478#ifndef ZERO 1479#ifdef _LP64 1480 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1481 if (!UseCompressedOops) { 1482 if (UseCompressedClassPointers) { 1483 warning("UseCompressedClassPointers requires UseCompressedOops"); 1484 } 1485 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1486 } else { 1487 // Turn on UseCompressedClassPointers too 1488 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1489 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1490 } 1491 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1492 if (UseCompressedClassPointers) { 1493 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1494 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1495 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1496 } 1497 } 1498 } 1499#endif // _LP64 1500#endif // !ZERO 1501} 1502 1503void Arguments::set_conservative_max_heap_alignment() { 1504 // The conservative maximum required alignment for the heap is the maximum of 1505 // the alignments imposed by several sources: any requirements from the heap 1506 // itself, the collector policy and the maximum page size we may run the VM 1507 // with. 1508 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1509#if INCLUDE_ALL_GCS 1510 if (UseParallelGC) { 1511 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1512 } else if (UseG1GC) { 1513 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1514 } 1515#endif // INCLUDE_ALL_GCS 1516 _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(), 1517 CollectorPolicy::compute_heap_alignment()); 1518} 1519 1520void Arguments::set_ergonomics_flags() { 1521 1522 if (os::is_server_class_machine()) { 1523 // If no other collector is requested explicitly, 1524 // let the VM select the collector based on 1525 // machine class and automatic selection policy. 1526 if (!UseSerialGC && 1527 !UseConcMarkSweepGC && 1528 !UseG1GC && 1529 !UseParNewGC && 1530 FLAG_IS_DEFAULT(UseParallelGC)) { 1531 if (should_auto_select_low_pause_collector()) { 1532 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1533 } else { 1534 FLAG_SET_ERGO(bool, UseParallelGC, true); 1535 } 1536 } 1537 } 1538#ifdef COMPILER2 1539 // Shared spaces work fine with other GCs but causes bytecode rewriting 1540 // to be disabled, which hurts interpreter performance and decreases 1541 // server performance. When -server is specified, keep the default off 1542 // unless it is asked for. Future work: either add bytecode rewriting 1543 // at link time, or rewrite bytecodes in non-shared methods. 1544 if (!DumpSharedSpaces && !RequireSharedSpaces && 1545 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1546 no_shared_spaces(); 1547 } 1548#endif 1549 1550 set_conservative_max_heap_alignment(); 1551 1552#ifndef ZERO 1553#ifdef _LP64 1554 set_use_compressed_oops(); 1555 1556 // set_use_compressed_klass_ptrs() must be called after calling 1557 // set_use_compressed_oops(). 1558 set_use_compressed_klass_ptrs(); 1559 1560 // Also checks that certain machines are slower with compressed oops 1561 // in vm_version initialization code. 1562#endif // _LP64 1563#endif // !ZERO 1564} 1565 1566void Arguments::set_parallel_gc_flags() { 1567 assert(UseParallelGC || UseParallelOldGC, "Error"); 1568 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1569 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1570 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1571 } 1572 FLAG_SET_DEFAULT(UseParallelGC, true); 1573 1574 // If no heap maximum was requested explicitly, use some reasonable fraction 1575 // of the physical memory, up to a maximum of 1GB. 1576 FLAG_SET_DEFAULT(ParallelGCThreads, 1577 Abstract_VM_Version::parallel_worker_threads()); 1578 if (ParallelGCThreads == 0) { 1579 jio_fprintf(defaultStream::error_stream(), 1580 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1581 vm_exit(1); 1582 } 1583 1584 if (UseAdaptiveSizePolicy) { 1585 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1586 // unless the user actually sets these flags. 1587 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1588 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1589 } 1590 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1591 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1592 } 1593 } 1594 1595 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1596 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1597 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1598 // See CR 6362902 for details. 1599 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1600 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1601 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1602 } 1603 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1604 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1605 } 1606 } 1607 1608 if (UseParallelOldGC) { 1609 // Par compact uses lower default values since they are treated as 1610 // minimums. These are different defaults because of the different 1611 // interpretation and are not ergonomically set. 1612 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1613 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1614 } 1615 } 1616} 1617 1618void Arguments::set_g1_gc_flags() { 1619 assert(UseG1GC, "Error"); 1620#ifdef COMPILER1 1621 FastTLABRefill = false; 1622#endif 1623 FLAG_SET_DEFAULT(ParallelGCThreads, 1624 Abstract_VM_Version::parallel_worker_threads()); 1625 if (ParallelGCThreads == 0) { 1626 FLAG_SET_DEFAULT(ParallelGCThreads, 1627 Abstract_VM_Version::parallel_worker_threads()); 1628 } 1629 1630 // MarkStackSize will be set (if it hasn't been set by the user) 1631 // when concurrent marking is initialized. 1632 // Its value will be based upon the number of parallel marking threads. 1633 // But we do set the maximum mark stack size here. 1634 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1635 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1636 } 1637 1638 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1639 // In G1, we want the default GC overhead goal to be higher than 1640 // say in PS. So we set it here to 10%. Otherwise the heap might 1641 // be expanded more aggressively than we would like it to. In 1642 // fact, even 10% seems to not be high enough in some cases 1643 // (especially small GC stress tests that the main thing they do 1644 // is allocation). We might consider increase it further. 1645 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1646 } 1647 1648 if (PrintGCDetails && Verbose) { 1649 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1650 MarkStackSize / K, MarkStackSizeMax / K); 1651 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1652 } 1653} 1654 1655julong Arguments::limit_by_allocatable_memory(julong limit) { 1656 julong max_allocatable; 1657 julong result = limit; 1658 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1659 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1660 } 1661 return result; 1662} 1663 1664void Arguments::set_heap_size() { 1665 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1666 // Deprecated flag 1667 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1668 } 1669 1670 const julong phys_mem = 1671 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1672 : (julong)MaxRAM; 1673 1674 // If the maximum heap size has not been set with -Xmx, 1675 // then set it as fraction of the size of physical memory, 1676 // respecting the maximum and minimum sizes of the heap. 1677 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1678 julong reasonable_max = phys_mem / MaxRAMFraction; 1679 1680 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1681 // Small physical memory, so use a minimum fraction of it for the heap 1682 reasonable_max = phys_mem / MinRAMFraction; 1683 } else { 1684 // Not-small physical memory, so require a heap at least 1685 // as large as MaxHeapSize 1686 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1687 } 1688 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1689 // Limit the heap size to ErgoHeapSizeLimit 1690 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1691 } 1692 if (UseCompressedOops) { 1693 // Limit the heap size to the maximum possible when using compressed oops 1694 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1695 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1696 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1697 // but it should be not less than default MaxHeapSize. 1698 max_coop_heap -= HeapBaseMinAddress; 1699 } 1700 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1701 } 1702 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1703 1704 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1705 // An initial heap size was specified on the command line, 1706 // so be sure that the maximum size is consistent. Done 1707 // after call to limit_by_allocatable_memory because that 1708 // method might reduce the allocation size. 1709 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1710 } 1711 1712 if (PrintGCDetails && Verbose) { 1713 // Cannot use gclog_or_tty yet. 1714 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1715 } 1716 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1717 } 1718 1719 // If the minimum or initial heap_size have not been set or requested to be set 1720 // ergonomically, set them accordingly. 1721 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1722 julong reasonable_minimum = (julong)(OldSize + NewSize); 1723 1724 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1725 1726 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1727 1728 if (InitialHeapSize == 0) { 1729 julong reasonable_initial = phys_mem / InitialRAMFraction; 1730 1731 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1732 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1733 1734 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1735 1736 if (PrintGCDetails && Verbose) { 1737 // Cannot use gclog_or_tty yet. 1738 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1739 } 1740 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1741 } 1742 // If the minimum heap size has not been set (via -Xms), 1743 // synchronize with InitialHeapSize to avoid errors with the default value. 1744 if (min_heap_size() == 0) { 1745 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1746 if (PrintGCDetails && Verbose) { 1747 // Cannot use gclog_or_tty yet. 1748 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1749 } 1750 } 1751 } 1752} 1753 1754// This must be called after ergonomics because we want bytecode rewriting 1755// if the server compiler is used, or if UseSharedSpaces is disabled. 1756void Arguments::set_bytecode_flags() { 1757 // Better not attempt to store into a read-only space. 1758 if (UseSharedSpaces) { 1759 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1760 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1761 } 1762 1763 if (!RewriteBytecodes) { 1764 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1765 } 1766} 1767 1768// Aggressive optimization flags -XX:+AggressiveOpts 1769void Arguments::set_aggressive_opts_flags() { 1770#ifdef COMPILER2 1771 if (AggressiveUnboxing) { 1772 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1773 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1774 } else if (!EliminateAutoBox) { 1775 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1776 AggressiveUnboxing = false; 1777 } 1778 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1779 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1780 } else if (!DoEscapeAnalysis) { 1781 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1782 AggressiveUnboxing = false; 1783 } 1784 } 1785 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1786 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1787 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1788 } 1789 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1790 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1791 } 1792 1793 // Feed the cache size setting into the JDK 1794 char buffer[1024]; 1795 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1796 add_property(buffer); 1797 } 1798 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1799 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1800 } 1801#endif 1802 1803 if (AggressiveOpts) { 1804// Sample flag setting code 1805// if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1806// FLAG_SET_DEFAULT(EliminateZeroing, true); 1807// } 1808 } 1809} 1810 1811//=========================================================================================================== 1812// Parsing of java.compiler property 1813 1814void Arguments::process_java_compiler_argument(char* arg) { 1815 // For backwards compatibility, Djava.compiler=NONE or "" 1816 // causes us to switch to -Xint mode UNLESS -Xdebug 1817 // is also specified. 1818 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1819 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1820 } 1821} 1822 1823void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1824 _sun_java_launcher = strdup(launcher); 1825} 1826 1827bool Arguments::created_by_java_launcher() { 1828 assert(_sun_java_launcher != NULL, "property must have value"); 1829 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1830} 1831 1832bool Arguments::sun_java_launcher_is_altjvm() { 1833 return _sun_java_launcher_is_altjvm; 1834} 1835 1836//=========================================================================================================== 1837// Parsing of main arguments 1838 1839bool Arguments::verify_interval(uintx val, uintx min, 1840 uintx max, const char* name) { 1841 // Returns true iff value is in the inclusive interval [min..max] 1842 // false, otherwise. 1843 if (val >= min && val <= max) { 1844 return true; 1845 } 1846 jio_fprintf(defaultStream::error_stream(), 1847 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1848 " and " UINTX_FORMAT "\n", 1849 name, val, min, max); 1850 return false; 1851} 1852 1853bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1854 // Returns true if given value is at least specified min threshold 1855 // false, otherwise. 1856 if (val >= min ) { 1857 return true; 1858 } 1859 jio_fprintf(defaultStream::error_stream(), 1860 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1861 name, val, min); 1862 return false; 1863} 1864 1865bool Arguments::verify_percentage(uintx value, const char* name) { 1866 if (is_percentage(value)) { 1867 return true; 1868 } 1869 jio_fprintf(defaultStream::error_stream(), 1870 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1871 name, value); 1872 return false; 1873} 1874 1875#if !INCLUDE_ALL_GCS 1876#ifdef ASSERT 1877static bool verify_serial_gc_flags() { 1878 return (UseSerialGC && 1879 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1880 UseParallelGC || UseParallelOldGC)); 1881} 1882#endif // ASSERT 1883#endif // INCLUDE_ALL_GCS 1884 1885// check if do gclog rotation 1886// +UseGCLogFileRotation is a must, 1887// no gc log rotation when log file not supplied or 1888// NumberOfGCLogFiles is 0, or GCLogFileSize is 0 1889void check_gclog_consistency() { 1890 if (UseGCLogFileRotation) { 1891 if ((Arguments::gc_log_filename() == NULL) || 1892 (NumberOfGCLogFiles == 0) || 1893 (GCLogFileSize == 0)) { 1894 jio_fprintf(defaultStream::output_stream(), 1895 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>[k|K|m|M|g|G]\n" 1896 "where num_of_file > 0 and num_of_size > 0\n" 1897 "GC log rotation is turned off\n"); 1898 UseGCLogFileRotation = false; 1899 } 1900 } 1901 1902 if (UseGCLogFileRotation && GCLogFileSize < 8*K) { 1903 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1904 jio_fprintf(defaultStream::output_stream(), 1905 "GCLogFileSize changed to minimum 8K\n"); 1906 } 1907} 1908 1909// This function is called for -Xloggc:<filename>, it can be used 1910// to check if a given file name(or string) conforms to the following 1911// specification: 1912// A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 1913// %p and %t only allowed once. We only limit usage of filename not path 1914bool is_filename_valid(const char *file_name) { 1915 const char* p = file_name; 1916 char file_sep = os::file_separator()[0]; 1917 const char* cp; 1918 // skip prefix path 1919 for (cp = file_name; *cp != '\0'; cp++) { 1920 if (*cp == '/' || *cp == file_sep) { 1921 p = cp + 1; 1922 } 1923 } 1924 1925 int count_p = 0; 1926 int count_t = 0; 1927 while (*p != '\0') { 1928 if ((*p >= '0' && *p <= '9') || 1929 (*p >= 'A' && *p <= 'Z') || 1930 (*p >= 'a' && *p <= 'z') || 1931 *p == '-' || 1932 *p == '_' || 1933 *p == '.') { 1934 p++; 1935 continue; 1936 } 1937 if (*p == '%') { 1938 if(*(p + 1) == 'p') { 1939 p += 2; 1940 count_p ++; 1941 continue; 1942 } 1943 if (*(p + 1) == 't') { 1944 p += 2; 1945 count_t ++; 1946 continue; 1947 } 1948 } 1949 return false; 1950 } 1951 return count_p < 2 && count_t < 2; 1952} 1953 1954bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) { 1955 if (!is_percentage(min_heap_free_ratio)) { 1956 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100"); 1957 return false; 1958 } 1959 if (min_heap_free_ratio > MaxHeapFreeRatio) { 1960 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1961 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio, 1962 MaxHeapFreeRatio); 1963 return false; 1964 } 1965 return true; 1966} 1967 1968bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) { 1969 if (!is_percentage(max_heap_free_ratio)) { 1970 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100"); 1971 return false; 1972 } 1973 if (max_heap_free_ratio < MinHeapFreeRatio) { 1974 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or " 1975 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio, 1976 MinHeapFreeRatio); 1977 return false; 1978 } 1979 return true; 1980} 1981 1982// Check consistency of GC selection 1983bool Arguments::check_gc_consistency() { 1984 check_gclog_consistency(); 1985 bool status = true; 1986 // Ensure that the user has not selected conflicting sets 1987 // of collectors. [Note: this check is merely a user convenience; 1988 // collectors over-ride each other so that only a non-conflicting 1989 // set is selected; however what the user gets is not what they 1990 // may have expected from the combination they asked for. It's 1991 // better to reduce user confusion by not allowing them to 1992 // select conflicting combinations. 1993 uint i = 0; 1994 if (UseSerialGC) i++; 1995 if (UseConcMarkSweepGC || UseParNewGC) i++; 1996 if (UseParallelGC || UseParallelOldGC) i++; 1997 if (UseG1GC) i++; 1998 if (i > 1) { 1999 jio_fprintf(defaultStream::error_stream(), 2000 "Conflicting collector combinations in option list; " 2001 "please refer to the release notes for the combinations " 2002 "allowed\n"); 2003 status = false; 2004 } 2005 return status; 2006} 2007 2008void Arguments::check_deprecated_gcs() { 2009 if (UseConcMarkSweepGC && !UseParNewGC) { 2010 warning("Using the DefNew young collector with the CMS collector is deprecated " 2011 "and will likely be removed in a future release"); 2012 } 2013 2014 if (UseParNewGC && !UseConcMarkSweepGC) { 2015 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 2016 // set up UseSerialGC properly, so that can't be used in the check here. 2017 warning("Using the ParNew young collector with the Serial old collector is deprecated " 2018 "and will likely be removed in a future release"); 2019 } 2020 2021 if (CMSIncrementalMode) { 2022 warning("Using incremental CMS is deprecated and will likely be removed in a future release"); 2023 } 2024} 2025 2026void Arguments::check_deprecated_gc_flags() { 2027 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 2028 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 2029 "and will likely be removed in future release"); 2030 } 2031 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 2032 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 2033 "Use MaxRAMFraction instead."); 2034 } 2035 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) { 2036 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release."); 2037 } 2038 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) { 2039 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release."); 2040 } 2041 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) { 2042 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release."); 2043 } 2044} 2045 2046// Check stack pages settings 2047bool Arguments::check_stack_pages() 2048{ 2049 bool status = true; 2050 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 2051 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 2052 // greater stack shadow pages can't generate instruction to bang stack 2053 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 2054 return status; 2055} 2056 2057// Check the consistency of vm_init_args 2058bool Arguments::check_vm_args_consistency() { 2059 // Method for adding checks for flag consistency. 2060 // The intent is to warn the user of all possible conflicts, 2061 // before returning an error. 2062 // Note: Needs platform-dependent factoring. 2063 bool status = true; 2064 2065 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 2066 // builds so the cost of stack banging can be measured. 2067#if (defined(PRODUCT) && defined(SOLARIS)) 2068 if (!UseBoundThreads && !UseStackBanging) { 2069 jio_fprintf(defaultStream::error_stream(), 2070 "-UseStackBanging conflicts with -UseBoundThreads\n"); 2071 2072 status = false; 2073 } 2074#endif 2075 2076 if (TLABRefillWasteFraction == 0) { 2077 jio_fprintf(defaultStream::error_stream(), 2078 "TLABRefillWasteFraction should be a denominator, " 2079 "not " SIZE_FORMAT "\n", 2080 TLABRefillWasteFraction); 2081 status = false; 2082 } 2083 2084 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 2085 "AdaptiveSizePolicyWeight"); 2086 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 2087 2088 // Divide by bucket size to prevent a large size from causing rollover when 2089 // calculating amount of memory needed to be allocated for the String table. 2090 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2091 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2092 2093 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize, 2094 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size"); 2095 2096 { 2097 // Using "else if" below to avoid printing two error messages if min > max. 2098 // This will also prevent us from reporting both min>100 and max>100 at the 2099 // same time, but that is less annoying than printing two identical errors IMHO. 2100 FormatBuffer<80> err_msg(""); 2101 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) { 2102 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2103 status = false; 2104 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) { 2105 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2106 status = false; 2107 } 2108 } 2109 2110 // Min/MaxMetaspaceFreeRatio 2111 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2112 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2113 2114 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2115 jio_fprintf(defaultStream::error_stream(), 2116 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2117 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2118 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2119 MinMetaspaceFreeRatio, 2120 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2121 MaxMetaspaceFreeRatio); 2122 status = false; 2123 } 2124 2125 // Trying to keep 100% free is not practical 2126 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2127 2128 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2129 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2130 } 2131 2132 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2133 // Settings to encourage splitting. 2134 if (!FLAG_IS_CMDLINE(NewRatio)) { 2135 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2136 } 2137 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2138 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2139 } 2140 } 2141 2142 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2143 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2144 if (GCTimeLimit == 100) { 2145 // Turn off gc-overhead-limit-exceeded checks 2146 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2147 } 2148 2149 status = status && check_gc_consistency(); 2150 status = status && check_stack_pages(); 2151 2152 if (CMSIncrementalMode) { 2153 if (!UseConcMarkSweepGC) { 2154 jio_fprintf(defaultStream::error_stream(), 2155 "error: invalid argument combination.\n" 2156 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 2157 "selected in order\nto use CMSIncrementalMode.\n"); 2158 status = false; 2159 } else { 2160 status = status && verify_percentage(CMSIncrementalDutyCycle, 2161 "CMSIncrementalDutyCycle"); 2162 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 2163 "CMSIncrementalDutyCycleMin"); 2164 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2165 "CMSIncrementalSafetyFactor"); 2166 status = status && verify_percentage(CMSIncrementalOffset, 2167 "CMSIncrementalOffset"); 2168 status = status && verify_percentage(CMSExpAvgFactor, 2169 "CMSExpAvgFactor"); 2170 // If it was not set on the command line, set 2171 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 2172 if (CMSInitiatingOccupancyFraction < 0) { 2173 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 2174 } 2175 } 2176 } 2177 2178 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2179 // insists that we hold the requisite locks so that the iteration is 2180 // MT-safe. For the verification at start-up and shut-down, we don't 2181 // yet have a good way of acquiring and releasing these locks, 2182 // which are not visible at the CollectedHeap level. We want to 2183 // be able to acquire these locks and then do the iteration rather 2184 // than just disable the lock verification. This will be fixed under 2185 // bug 4788986. 2186 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2187 if (VerifyDuringStartup) { 2188 warning("Heap verification at start-up disabled " 2189 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2190 VerifyDuringStartup = false; // Disable verification at start-up 2191 } 2192 2193 if (VerifyBeforeExit) { 2194 warning("Heap verification at shutdown disabled " 2195 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2196 VerifyBeforeExit = false; // Disable verification at shutdown 2197 } 2198 } 2199 2200 // Note: only executed in non-PRODUCT mode 2201 if (!UseAsyncConcMarkSweepGC && 2202 (ExplicitGCInvokesConcurrent || 2203 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2204 jio_fprintf(defaultStream::error_stream(), 2205 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2206 " with -UseAsyncConcMarkSweepGC"); 2207 status = false; 2208 } 2209 2210 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2211 2212#if INCLUDE_ALL_GCS 2213 if (UseG1GC) { 2214 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent"); 2215 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent"); 2216 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent"); 2217 2218 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2219 "InitiatingHeapOccupancyPercent"); 2220 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2221 "G1RefProcDrainInterval"); 2222 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2223 "G1ConcMarkStepDurationMillis"); 2224 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2225 "G1ConcRSHotCardLimit"); 2226 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2227 "G1ConcRSLogCacheSize"); 2228 } 2229 if (UseConcMarkSweepGC) { 2230 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2231 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2232 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2233 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2234 2235 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2236 2237 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2238 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2239 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2240 2241 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2242 2243 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2244 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2245 2246 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2247 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2248 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2249 2250 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2251 2252 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2253 2254 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2255 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2256 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2257 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2258 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2259 } 2260 2261 if (UseParallelGC || UseParallelOldGC) { 2262 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2263 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2264 2265 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2266 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2267 2268 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2269 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2270 2271 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2272 2273 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2274 } 2275#endif // INCLUDE_ALL_GCS 2276 2277 status = status && verify_interval(RefDiscoveryPolicy, 2278 ReferenceProcessor::DiscoveryPolicyMin, 2279 ReferenceProcessor::DiscoveryPolicyMax, 2280 "RefDiscoveryPolicy"); 2281 2282 // Limit the lower bound of this flag to 1 as it is used in a division 2283 // expression. 2284 status = status && verify_interval(TLABWasteTargetPercent, 2285 1, 100, "TLABWasteTargetPercent"); 2286 2287 status = status && verify_object_alignment(); 2288 2289 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2290 "CompressedClassSpaceSize"); 2291 2292 status = status && verify_interval(MarkStackSizeMax, 2293 1, (max_jint - 1), "MarkStackSizeMax"); 2294 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2295 2296 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2297 2298 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2299 2300 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2301 2302 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2303 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2304 2305 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2306 2307 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2308 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2309 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2310 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2311 2312 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2313 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2314 2315 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2316 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2317 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2318 2319 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2320 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2321 2322 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp 2323 // just for that, so hardcode here. 2324 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold"); 2325 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold"); 2326 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2327 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2328 2329 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2330 2331 if (PrintNMTStatistics) { 2332#if INCLUDE_NMT 2333 if (MemTracker::tracking_level() == MemTracker::NMT_off) { 2334#endif // INCLUDE_NMT 2335 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2336 PrintNMTStatistics = false; 2337#if INCLUDE_NMT 2338 } 2339#endif 2340 } 2341 2342 // Need to limit the extent of the padding to reasonable size. 2343 // 8K is well beyond the reasonable HW cache line size, even with the 2344 // aggressive prefetching, while still leaving the room for segregating 2345 // among the distinct pages. 2346 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2347 jio_fprintf(defaultStream::error_stream(), 2348 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2349 ContendedPaddingWidth, 0, 8192); 2350 status = false; 2351 } 2352 2353 // Need to enforce the padding not to break the existing field alignments. 2354 // It is sufficient to check against the largest type size. 2355 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2356 jio_fprintf(defaultStream::error_stream(), 2357 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2358 ContendedPaddingWidth, BytesPerLong); 2359 status = false; 2360 } 2361 2362 // Check lower bounds of the code cache 2363 // Template Interpreter code is approximately 3X larger in debug builds. 2364 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace; 2365 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2366 jio_fprintf(defaultStream::error_stream(), 2367 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2368 os::vm_page_size()/K); 2369 status = false; 2370 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2371 jio_fprintf(defaultStream::error_stream(), 2372 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2373 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2374 status = false; 2375 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2376 jio_fprintf(defaultStream::error_stream(), 2377 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2378 min_code_cache_size/K); 2379 status = false; 2380 } else if (ReservedCodeCacheSize > 2*G) { 2381 // Code cache size larger than MAXINT is not supported. 2382 jio_fprintf(defaultStream::error_stream(), 2383 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2384 (2*G)/M); 2385 status = false; 2386 } 2387 2388 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction"); 2389 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); 2390 2391 return status; 2392} 2393 2394bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2395 const char* option_type) { 2396 if (ignore) return false; 2397 2398 const char* spacer = " "; 2399 if (option_type == NULL) { 2400 option_type = ++spacer; // Set both to the empty string. 2401 } 2402 2403 if (os::obsolete_option(option)) { 2404 jio_fprintf(defaultStream::error_stream(), 2405 "Obsolete %s%soption: %s\n", option_type, spacer, 2406 option->optionString); 2407 return false; 2408 } else { 2409 jio_fprintf(defaultStream::error_stream(), 2410 "Unrecognized %s%soption: %s\n", option_type, spacer, 2411 option->optionString); 2412 return true; 2413 } 2414} 2415 2416static const char* user_assertion_options[] = { 2417 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2418}; 2419 2420static const char* system_assertion_options[] = { 2421 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2422}; 2423 2424// Return true if any of the strings in null-terminated array 'names' matches. 2425// If tail_allowed is true, then the tail must begin with a colon; otherwise, 2426// the option must match exactly. 2427static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2428 bool tail_allowed) { 2429 for (/* empty */; *names != NULL; ++names) { 2430 if (match_option(option, *names, tail)) { 2431 if (**tail == '\0' || tail_allowed && **tail == ':') { 2432 return true; 2433 } 2434 } 2435 } 2436 return false; 2437} 2438 2439bool Arguments::parse_uintx(const char* value, 2440 uintx* uintx_arg, 2441 uintx min_size) { 2442 2443 // Check the sign first since atomull() parses only unsigned values. 2444 bool value_is_positive = !(*value == '-'); 2445 2446 if (value_is_positive) { 2447 julong n; 2448 bool good_return = atomull(value, &n); 2449 if (good_return) { 2450 bool above_minimum = n >= min_size; 2451 bool value_is_too_large = n > max_uintx; 2452 2453 if (above_minimum && !value_is_too_large) { 2454 *uintx_arg = n; 2455 return true; 2456 } 2457 } 2458 } 2459 return false; 2460} 2461 2462Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2463 julong* long_arg, 2464 julong min_size) { 2465 if (!atomull(s, long_arg)) return arg_unreadable; 2466 return check_memory_size(*long_arg, min_size); 2467} 2468 2469// Parse JavaVMInitArgs structure 2470 2471jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2472 // For components of the system classpath. 2473 SysClassPath scp(Arguments::get_sysclasspath()); 2474 bool scp_assembly_required = false; 2475 2476 // Save default settings for some mode flags 2477 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2478 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2479 Arguments::_ClipInlining = ClipInlining; 2480 Arguments::_BackgroundCompilation = BackgroundCompilation; 2481 2482 // Setup flags for mixed which is the default 2483 set_mode_flags(_mixed); 2484 2485 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2486 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2487 if (result != JNI_OK) { 2488 return result; 2489 } 2490 2491 // Parse JavaVMInitArgs structure passed in 2492 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE); 2493 if (result != JNI_OK) { 2494 return result; 2495 } 2496 2497 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2498 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2499 if (result != JNI_OK) { 2500 return result; 2501 } 2502 2503 // Do final processing now that all arguments have been parsed 2504 result = finalize_vm_init_args(&scp, scp_assembly_required); 2505 if (result != JNI_OK) { 2506 return result; 2507 } 2508 2509 return JNI_OK; 2510} 2511 2512// Checks if name in command-line argument -agent{lib,path}:name[=options] 2513// represents a valid HPROF of JDWP agent. is_path==true denotes that we 2514// are dealing with -agentpath (case where name is a path), otherwise with 2515// -agentlib 2516bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2517 char *_name; 2518 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2519 size_t _len_hprof, _len_jdwp, _len_prefix; 2520 2521 if (is_path) { 2522 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2523 return false; 2524 } 2525 2526 _name++; // skip past last path separator 2527 _len_prefix = strlen(JNI_LIB_PREFIX); 2528 2529 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2530 return false; 2531 } 2532 2533 _name += _len_prefix; 2534 _len_hprof = strlen(_hprof); 2535 _len_jdwp = strlen(_jdwp); 2536 2537 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2538 _name += _len_hprof; 2539 } 2540 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2541 _name += _len_jdwp; 2542 } 2543 else { 2544 return false; 2545 } 2546 2547 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2548 return false; 2549 } 2550 2551 return true; 2552 } 2553 2554 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2555 return true; 2556 } 2557 2558 return false; 2559} 2560 2561jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2562 SysClassPath* scp_p, 2563 bool* scp_assembly_required_p, 2564 Flag::Flags origin) { 2565 // Remaining part of option string 2566 const char* tail; 2567 2568 // iterate over arguments 2569 for (int index = 0; index < args->nOptions; index++) { 2570 bool is_absolute_path = false; // for -agentpath vs -agentlib 2571 2572 const JavaVMOption* option = args->options + index; 2573 2574 if (!match_option(option, "-Djava.class.path", &tail) && 2575 !match_option(option, "-Dsun.java.command", &tail) && 2576 !match_option(option, "-Dsun.java.launcher", &tail)) { 2577 2578 // add all jvm options to the jvm_args string. This string 2579 // is used later to set the java.vm.args PerfData string constant. 2580 // the -Djava.class.path and the -Dsun.java.command options are 2581 // omitted from jvm_args string as each have their own PerfData 2582 // string constant object. 2583 build_jvm_args(option->optionString); 2584 } 2585 2586 // -verbose:[class/gc/jni] 2587 if (match_option(option, "-verbose", &tail)) { 2588 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2589 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2590 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2591 } else if (!strcmp(tail, ":gc")) { 2592 FLAG_SET_CMDLINE(bool, PrintGC, true); 2593 } else if (!strcmp(tail, ":jni")) { 2594 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2595 } 2596 // -da / -ea / -disableassertions / -enableassertions 2597 // These accept an optional class/package name separated by a colon, e.g., 2598 // -da:java.lang.Thread. 2599 } else if (match_option(option, user_assertion_options, &tail, true)) { 2600 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2601 if (*tail == '\0') { 2602 JavaAssertions::setUserClassDefault(enable); 2603 } else { 2604 assert(*tail == ':', "bogus match by match_option()"); 2605 JavaAssertions::addOption(tail + 1, enable); 2606 } 2607 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2608 } else if (match_option(option, system_assertion_options, &tail, false)) { 2609 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2610 JavaAssertions::setSystemClassDefault(enable); 2611 // -bootclasspath: 2612 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2613 scp_p->reset_path(tail); 2614 *scp_assembly_required_p = true; 2615 // -bootclasspath/a: 2616 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2617 scp_p->add_suffix(tail); 2618 *scp_assembly_required_p = true; 2619 // -bootclasspath/p: 2620 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2621 scp_p->add_prefix(tail); 2622 *scp_assembly_required_p = true; 2623 // -Xrun 2624 } else if (match_option(option, "-Xrun", &tail)) { 2625 if (tail != NULL) { 2626 const char* pos = strchr(tail, ':'); 2627 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2628 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2629 name[len] = '\0'; 2630 2631 char *options = NULL; 2632 if(pos != NULL) { 2633 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2634 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2635 } 2636#if !INCLUDE_JVMTI 2637 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2638 jio_fprintf(defaultStream::error_stream(), 2639 "Profiling and debugging agents are not supported in this VM\n"); 2640 return JNI_ERR; 2641 } 2642#endif // !INCLUDE_JVMTI 2643 add_init_library(name, options); 2644 } 2645 // -agentlib and -agentpath 2646 } else if (match_option(option, "-agentlib:", &tail) || 2647 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2648 if(tail != NULL) { 2649 const char* pos = strchr(tail, '='); 2650 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2651 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2652 name[len] = '\0'; 2653 2654 char *options = NULL; 2655 if(pos != NULL) { 2656 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2657 } 2658#if !INCLUDE_JVMTI 2659 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2660 jio_fprintf(defaultStream::error_stream(), 2661 "Profiling and debugging agents are not supported in this VM\n"); 2662 return JNI_ERR; 2663 } 2664#endif // !INCLUDE_JVMTI 2665 add_init_agent(name, options, is_absolute_path); 2666 } 2667 // -javaagent 2668 } else if (match_option(option, "-javaagent:", &tail)) { 2669#if !INCLUDE_JVMTI 2670 jio_fprintf(defaultStream::error_stream(), 2671 "Instrumentation agents are not supported in this VM\n"); 2672 return JNI_ERR; 2673#else 2674 if(tail != NULL) { 2675 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2676 add_init_agent("instrument", options, false); 2677 } 2678#endif // !INCLUDE_JVMTI 2679 // -Xnoclassgc 2680 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2681 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2682 // -Xincgc: i-CMS 2683 } else if (match_option(option, "-Xincgc", &tail)) { 2684 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2685 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2686 // -Xnoincgc: no i-CMS 2687 } else if (match_option(option, "-Xnoincgc", &tail)) { 2688 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2689 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2690 // -Xconcgc 2691 } else if (match_option(option, "-Xconcgc", &tail)) { 2692 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2693 // -Xnoconcgc 2694 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2695 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2696 // -Xbatch 2697 } else if (match_option(option, "-Xbatch", &tail)) { 2698 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2699 // -Xmn for compatibility with other JVM vendors 2700 } else if (match_option(option, "-Xmn", &tail)) { 2701 julong long_initial_young_size = 0; 2702 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2703 if (errcode != arg_in_range) { 2704 jio_fprintf(defaultStream::error_stream(), 2705 "Invalid initial young generation size: %s\n", option->optionString); 2706 describe_range_error(errcode); 2707 return JNI_EINVAL; 2708 } 2709 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size); 2710 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size); 2711 // -Xms 2712 } else if (match_option(option, "-Xms", &tail)) { 2713 julong long_initial_heap_size = 0; 2714 // an initial heap size of 0 means automatically determine 2715 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2716 if (errcode != arg_in_range) { 2717 jio_fprintf(defaultStream::error_stream(), 2718 "Invalid initial heap size: %s\n", option->optionString); 2719 describe_range_error(errcode); 2720 return JNI_EINVAL; 2721 } 2722 set_min_heap_size((uintx)long_initial_heap_size); 2723 // Currently the minimum size and the initial heap sizes are the same. 2724 // Can be overridden with -XX:InitialHeapSize. 2725 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2726 // -Xmx 2727 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2728 julong long_max_heap_size = 0; 2729 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2730 if (errcode != arg_in_range) { 2731 jio_fprintf(defaultStream::error_stream(), 2732 "Invalid maximum heap size: %s\n", option->optionString); 2733 describe_range_error(errcode); 2734 return JNI_EINVAL; 2735 } 2736 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2737 // Xmaxf 2738 } else if (match_option(option, "-Xmaxf", &tail)) { 2739 char* err; 2740 int maxf = (int)(strtod(tail, &err) * 100); 2741 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) { 2742 jio_fprintf(defaultStream::error_stream(), 2743 "Bad max heap free percentage size: %s\n", 2744 option->optionString); 2745 return JNI_EINVAL; 2746 } else { 2747 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2748 } 2749 // Xminf 2750 } else if (match_option(option, "-Xminf", &tail)) { 2751 char* err; 2752 int minf = (int)(strtod(tail, &err) * 100); 2753 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) { 2754 jio_fprintf(defaultStream::error_stream(), 2755 "Bad min heap free percentage size: %s\n", 2756 option->optionString); 2757 return JNI_EINVAL; 2758 } else { 2759 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2760 } 2761 // -Xss 2762 } else if (match_option(option, "-Xss", &tail)) { 2763 julong long_ThreadStackSize = 0; 2764 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2765 if (errcode != arg_in_range) { 2766 jio_fprintf(defaultStream::error_stream(), 2767 "Invalid thread stack size: %s\n", option->optionString); 2768 describe_range_error(errcode); 2769 return JNI_EINVAL; 2770 } 2771 // Internally track ThreadStackSize in units of 1024 bytes. 2772 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2773 round_to((int)long_ThreadStackSize, K) / K); 2774 // -Xoss 2775 } else if (match_option(option, "-Xoss", &tail)) { 2776 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2777 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2778 julong long_CodeCacheExpansionSize = 0; 2779 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2780 if (errcode != arg_in_range) { 2781 jio_fprintf(defaultStream::error_stream(), 2782 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2783 os::vm_page_size()/K); 2784 return JNI_EINVAL; 2785 } 2786 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2787 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2788 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2789 julong long_ReservedCodeCacheSize = 0; 2790 2791 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2792 if (errcode != arg_in_range) { 2793 jio_fprintf(defaultStream::error_stream(), 2794 "Invalid maximum code cache size: %s.\n", option->optionString); 2795 return JNI_EINVAL; 2796 } 2797 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2798 //-XX:IncreaseFirstTierCompileThresholdAt= 2799 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2800 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2801 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2802 jio_fprintf(defaultStream::error_stream(), 2803 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2804 option->optionString); 2805 return JNI_EINVAL; 2806 } 2807 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2808 // -green 2809 } else if (match_option(option, "-green", &tail)) { 2810 jio_fprintf(defaultStream::error_stream(), 2811 "Green threads support not available\n"); 2812 return JNI_EINVAL; 2813 // -native 2814 } else if (match_option(option, "-native", &tail)) { 2815 // HotSpot always uses native threads, ignore silently for compatibility 2816 // -Xsqnopause 2817 } else if (match_option(option, "-Xsqnopause", &tail)) { 2818 // EVM option, ignore silently for compatibility 2819 // -Xrs 2820 } else if (match_option(option, "-Xrs", &tail)) { 2821 // Classic/EVM option, new functionality 2822 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2823 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2824 // change default internal VM signals used - lower case for back compat 2825 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2826 // -Xoptimize 2827 } else if (match_option(option, "-Xoptimize", &tail)) { 2828 // EVM option, ignore silently for compatibility 2829 // -Xprof 2830 } else if (match_option(option, "-Xprof", &tail)) { 2831#if INCLUDE_FPROF 2832 _has_profile = true; 2833#else // INCLUDE_FPROF 2834 jio_fprintf(defaultStream::error_stream(), 2835 "Flat profiling is not supported in this VM.\n"); 2836 return JNI_ERR; 2837#endif // INCLUDE_FPROF 2838 // -Xconcurrentio 2839 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2840 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2841 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2842 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2843 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2844 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2845 2846 // -Xinternalversion 2847 } else if (match_option(option, "-Xinternalversion", &tail)) { 2848 jio_fprintf(defaultStream::output_stream(), "%s\n", 2849 VM_Version::internal_vm_info_string()); 2850 vm_exit(0); 2851#ifndef PRODUCT 2852 // -Xprintflags 2853 } else if (match_option(option, "-Xprintflags", &tail)) { 2854 CommandLineFlags::printFlags(tty, false); 2855 vm_exit(0); 2856#endif 2857 // -D 2858 } else if (match_option(option, "-D", &tail)) { 2859 if (!add_property(tail)) { 2860 return JNI_ENOMEM; 2861 } 2862 // Out of the box management support 2863 if (match_option(option, "-Dcom.sun.management", &tail)) { 2864#if INCLUDE_MANAGEMENT 2865 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2866#else 2867 jio_fprintf(defaultStream::output_stream(), 2868 "-Dcom.sun.management is not supported in this VM.\n"); 2869 return JNI_ERR; 2870#endif 2871 } 2872 // -Xint 2873 } else if (match_option(option, "-Xint", &tail)) { 2874 set_mode_flags(_int); 2875 // -Xmixed 2876 } else if (match_option(option, "-Xmixed", &tail)) { 2877 set_mode_flags(_mixed); 2878 // -Xcomp 2879 } else if (match_option(option, "-Xcomp", &tail)) { 2880 // for testing the compiler; turn off all flags that inhibit compilation 2881 set_mode_flags(_comp); 2882 // -Xshare:dump 2883 } else if (match_option(option, "-Xshare:dump", &tail)) { 2884 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2885 set_mode_flags(_int); // Prevent compilation, which creates objects 2886 // -Xshare:on 2887 } else if (match_option(option, "-Xshare:on", &tail)) { 2888 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2889 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2890 // -Xshare:auto 2891 } else if (match_option(option, "-Xshare:auto", &tail)) { 2892 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2893 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2894 // -Xshare:off 2895 } else if (match_option(option, "-Xshare:off", &tail)) { 2896 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2897 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2898 // -Xverify 2899 } else if (match_option(option, "-Xverify", &tail)) { 2900 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2901 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2902 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2903 } else if (strcmp(tail, ":remote") == 0) { 2904 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2905 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2906 } else if (strcmp(tail, ":none") == 0) { 2907 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2908 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2909 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2910 return JNI_EINVAL; 2911 } 2912 // -Xdebug 2913 } else if (match_option(option, "-Xdebug", &tail)) { 2914 // note this flag has been used, then ignore 2915 set_xdebug_mode(true); 2916 // -Xnoagent 2917 } else if (match_option(option, "-Xnoagent", &tail)) { 2918 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2919 } else if (match_option(option, "-Xboundthreads", &tail)) { 2920 // Bind user level threads to kernel threads (Solaris only) 2921 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2922 } else if (match_option(option, "-Xloggc:", &tail)) { 2923 // Redirect GC output to the file. -Xloggc:<filename> 2924 // ostream_init_log(), when called will use this filename 2925 // to initialize a fileStream. 2926 _gc_log_filename = strdup(tail); 2927 if (!is_filename_valid(_gc_log_filename)) { 2928 jio_fprintf(defaultStream::output_stream(), 2929 "Invalid file name for use with -Xloggc: Filename can only contain the " 2930 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 2931 "Note %%p or %%t can only be used once\n", _gc_log_filename); 2932 return JNI_EINVAL; 2933 } 2934 FLAG_SET_CMDLINE(bool, PrintGC, true); 2935 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2936 2937 // JNI hooks 2938 } else if (match_option(option, "-Xcheck", &tail)) { 2939 if (!strcmp(tail, ":jni")) { 2940#if !INCLUDE_JNI_CHECK 2941 warning("JNI CHECKING is not supported in this VM"); 2942#else 2943 CheckJNICalls = true; 2944#endif // INCLUDE_JNI_CHECK 2945 } else if (is_bad_option(option, args->ignoreUnrecognized, 2946 "check")) { 2947 return JNI_EINVAL; 2948 } 2949 } else if (match_option(option, "vfprintf", &tail)) { 2950 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2951 } else if (match_option(option, "exit", &tail)) { 2952 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2953 } else if (match_option(option, "abort", &tail)) { 2954 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2955 // -XX:+AggressiveHeap 2956 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2957 2958 // This option inspects the machine and attempts to set various 2959 // parameters to be optimal for long-running, memory allocation 2960 // intensive jobs. It is intended for machines with large 2961 // amounts of cpu and memory. 2962 2963 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2964 // VM, but we may not be able to represent the total physical memory 2965 // available (like having 8gb of memory on a box but using a 32bit VM). 2966 // Thus, we need to make sure we're using a julong for intermediate 2967 // calculations. 2968 julong initHeapSize; 2969 julong total_memory = os::physical_memory(); 2970 2971 if (total_memory < (julong)256*M) { 2972 jio_fprintf(defaultStream::error_stream(), 2973 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2974 vm_exit(1); 2975 } 2976 2977 // The heap size is half of available memory, or (at most) 2978 // all of possible memory less 160mb (leaving room for the OS 2979 // when using ISM). This is the maximum; because adaptive sizing 2980 // is turned on below, the actual space used may be smaller. 2981 2982 initHeapSize = MIN2(total_memory / (julong)2, 2983 total_memory - (julong)160*M); 2984 2985 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2986 2987 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2988 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2989 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2990 // Currently the minimum size and the initial heap sizes are the same. 2991 set_min_heap_size(initHeapSize); 2992 } 2993 if (FLAG_IS_DEFAULT(NewSize)) { 2994 // Make the young generation 3/8ths of the total heap. 2995 FLAG_SET_CMDLINE(uintx, NewSize, 2996 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2997 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2998 } 2999 3000#ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3001 FLAG_SET_DEFAULT(UseLargePages, true); 3002#endif 3003 3004 // Increase some data structure sizes for efficiency 3005 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 3006 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3007 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 3008 3009 // See the OldPLABSize comment below, but replace 'after promotion' 3010 // with 'after copying'. YoungPLABSize is the size of the survivor 3011 // space per-gc-thread buffers. The default is 4kw. 3012 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 3013 3014 // OldPLABSize is the size of the buffers in the old gen that 3015 // UseParallelGC uses to promote live data that doesn't fit in the 3016 // survivor spaces. At any given time, there's one for each gc thread. 3017 // The default size is 1kw. These buffers are rarely used, since the 3018 // survivor spaces are usually big enough. For specjbb, however, there 3019 // are occasions when there's lots of live data in the young gen 3020 // and we end up promoting some of it. We don't have a definite 3021 // explanation for why bumping OldPLABSize helps, but the theory 3022 // is that a bigger PLAB results in retaining something like the 3023 // original allocation order after promotion, which improves mutator 3024 // locality. A minor effect may be that larger PLABs reduce the 3025 // number of PLAB allocation events during gc. The value of 8kw 3026 // was arrived at by experimenting with specjbb. 3027 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 3028 3029 // Enable parallel GC and adaptive generation sizing 3030 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 3031 FLAG_SET_DEFAULT(ParallelGCThreads, 3032 Abstract_VM_Version::parallel_worker_threads()); 3033 3034 // Encourage steady state memory management 3035 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 3036 3037 // This appears to improve mutator locality 3038 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3039 3040 // Get around early Solaris scheduling bug 3041 // (affinity vs other jobs on system) 3042 // but disallow DR and offlining (5008695). 3043 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 3044 3045 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 3046 // The last option must always win. 3047 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3048 FLAG_SET_CMDLINE(bool, NeverTenure, true); 3049 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 3050 // The last option must always win. 3051 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3052 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3053 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 3054 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 3055 jio_fprintf(defaultStream::error_stream(), 3056 "Please use CMSClassUnloadingEnabled in place of " 3057 "CMSPermGenSweepingEnabled in the future\n"); 3058 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 3059 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 3060 jio_fprintf(defaultStream::error_stream(), 3061 "Please use -XX:+UseGCOverheadLimit in place of " 3062 "-XX:+UseGCTimeLimit in the future\n"); 3063 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 3064 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 3065 jio_fprintf(defaultStream::error_stream(), 3066 "Please use -XX:-UseGCOverheadLimit in place of " 3067 "-XX:-UseGCTimeLimit in the future\n"); 3068 // The TLE options are for compatibility with 1.3 and will be 3069 // removed without notice in a future release. These options 3070 // are not to be documented. 3071 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 3072 // No longer used. 3073 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 3074 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 3075 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 3076 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3077 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 3078 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 3079 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 3080 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 3081 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 3082 // No longer used. 3083 } else if (match_option(option, "-XX:TLESize=", &tail)) { 3084 julong long_tlab_size = 0; 3085 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 3086 if (errcode != arg_in_range) { 3087 jio_fprintf(defaultStream::error_stream(), 3088 "Invalid TLAB size: %s\n", option->optionString); 3089 describe_range_error(errcode); 3090 return JNI_EINVAL; 3091 } 3092 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 3093 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 3094 // No longer used. 3095 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 3096 FLAG_SET_CMDLINE(bool, UseTLAB, true); 3097 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 3098 FLAG_SET_CMDLINE(bool, UseTLAB, false); 3099 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 3100 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3101 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3102 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 3103 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3104 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3105 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 3106#if defined(DTRACE_ENABLED) 3107 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3108 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3109 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3110 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3111#else // defined(DTRACE_ENABLED) 3112 jio_fprintf(defaultStream::error_stream(), 3113 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3114 return JNI_EINVAL; 3115#endif // defined(DTRACE_ENABLED) 3116#ifdef ASSERT 3117 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 3118 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3119 // disable scavenge before parallel mark-compact 3120 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3121#endif 3122 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 3123 julong cms_blocks_to_claim = (julong)atol(tail); 3124 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3125 jio_fprintf(defaultStream::error_stream(), 3126 "Please use -XX:OldPLABSize in place of " 3127 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 3128 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 3129 julong cms_blocks_to_claim = (julong)atol(tail); 3130 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3131 jio_fprintf(defaultStream::error_stream(), 3132 "Please use -XX:OldPLABSize in place of " 3133 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 3134 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 3135 julong old_plab_size = 0; 3136 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 3137 if (errcode != arg_in_range) { 3138 jio_fprintf(defaultStream::error_stream(), 3139 "Invalid old PLAB size: %s\n", option->optionString); 3140 describe_range_error(errcode); 3141 return JNI_EINVAL; 3142 } 3143 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 3144 jio_fprintf(defaultStream::error_stream(), 3145 "Please use -XX:OldPLABSize in place of " 3146 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 3147 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 3148 julong young_plab_size = 0; 3149 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 3150 if (errcode != arg_in_range) { 3151 jio_fprintf(defaultStream::error_stream(), 3152 "Invalid young PLAB size: %s\n", option->optionString); 3153 describe_range_error(errcode); 3154 return JNI_EINVAL; 3155 } 3156 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 3157 jio_fprintf(defaultStream::error_stream(), 3158 "Please use -XX:YoungPLABSize in place of " 3159 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 3160 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3161 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3162 julong stack_size = 0; 3163 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3164 if (errcode != arg_in_range) { 3165 jio_fprintf(defaultStream::error_stream(), 3166 "Invalid mark stack size: %s\n", option->optionString); 3167 describe_range_error(errcode); 3168 return JNI_EINVAL; 3169 } 3170 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3171 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3172 julong max_stack_size = 0; 3173 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3174 if (errcode != arg_in_range) { 3175 jio_fprintf(defaultStream::error_stream(), 3176 "Invalid maximum mark stack size: %s\n", 3177 option->optionString); 3178 describe_range_error(errcode); 3179 return JNI_EINVAL; 3180 } 3181 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3182 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3183 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3184 uintx conc_threads = 0; 3185 if (!parse_uintx(tail, &conc_threads, 1)) { 3186 jio_fprintf(defaultStream::error_stream(), 3187 "Invalid concurrent threads: %s\n", option->optionString); 3188 return JNI_EINVAL; 3189 } 3190 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3191 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3192 julong max_direct_memory_size = 0; 3193 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3194 if (errcode != arg_in_range) { 3195 jio_fprintf(defaultStream::error_stream(), 3196 "Invalid maximum direct memory size: %s\n", 3197 option->optionString); 3198 describe_range_error(errcode); 3199 return JNI_EINVAL; 3200 } 3201 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3202 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) { 3203 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go 3204 // away and will cause VM initialization failures! 3205 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release."); 3206 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true); 3207#if !INCLUDE_MANAGEMENT 3208 } else if (match_option(option, "-XX:+ManagementServer", &tail)) { 3209 jio_fprintf(defaultStream::error_stream(), 3210 "ManagementServer is not supported in this VM.\n"); 3211 return JNI_ERR; 3212#endif // INCLUDE_MANAGEMENT 3213 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3214 // Skip -XX:Flags= since that case has already been handled 3215 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3216 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3217 return JNI_EINVAL; 3218 } 3219 } 3220 // Unknown option 3221 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3222 return JNI_ERR; 3223 } 3224 } 3225 3226 // Change the default value for flags which have different default values 3227 // when working with older JDKs. 3228#ifdef LINUX 3229 if (JDK_Version::current().compare_major(6) <= 0 && 3230 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3231 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3232 } 3233#endif // LINUX 3234 return JNI_OK; 3235} 3236 3237jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3238 // This must be done after all -D arguments have been processed. 3239 scp_p->expand_endorsed(); 3240 3241 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 3242 // Assemble the bootclasspath elements into the final path. 3243 Arguments::set_sysclasspath(scp_p->combined_path()); 3244 } 3245 3246 // This must be done after all arguments have been processed. 3247 // java_compiler() true means set to "NONE" or empty. 3248 if (java_compiler() && !xdebug_mode()) { 3249 // For backwards compatibility, we switch to interpreted mode if 3250 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3251 // not specified. 3252 set_mode_flags(_int); 3253 } 3254 if (CompileThreshold == 0) { 3255 set_mode_flags(_int); 3256 } 3257 3258 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3259 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3260 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3261 } 3262 3263#ifndef COMPILER2 3264 // Don't degrade server performance for footprint 3265 if (FLAG_IS_DEFAULT(UseLargePages) && 3266 MaxHeapSize < LargePageHeapSizeThreshold) { 3267 // No need for large granularity pages w/small heaps. 3268 // Note that large pages are enabled/disabled for both the 3269 // Java heap and the code cache. 3270 FLAG_SET_DEFAULT(UseLargePages, false); 3271 } 3272 3273#else 3274 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3275 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3276 } 3277#endif 3278 3279#ifndef TIERED 3280 // Tiered compilation is undefined. 3281 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3282#endif 3283 3284 // If we are running in a headless jre, force java.awt.headless property 3285 // to be true unless the property has already been set. 3286 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3287 if (os::is_headless_jre()) { 3288 const char* headless = Arguments::get_property("java.awt.headless"); 3289 if (headless == NULL) { 3290 char envbuffer[128]; 3291 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3292 if (!add_property("java.awt.headless=true")) { 3293 return JNI_ENOMEM; 3294 } 3295 } else { 3296 char buffer[256]; 3297 strcpy(buffer, "java.awt.headless="); 3298 strcat(buffer, envbuffer); 3299 if (!add_property(buffer)) { 3300 return JNI_ENOMEM; 3301 } 3302 } 3303 } 3304 } 3305 3306 if (!check_vm_args_consistency()) { 3307 return JNI_ERR; 3308 } 3309 3310 return JNI_OK; 3311} 3312 3313jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3314 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3315 scp_assembly_required_p); 3316} 3317 3318jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3319 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3320 scp_assembly_required_p); 3321} 3322 3323jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3324 const int N_MAX_OPTIONS = 64; 3325 const int OPTION_BUFFER_SIZE = 1024; 3326 char buffer[OPTION_BUFFER_SIZE]; 3327 3328 // The variable will be ignored if it exceeds the length of the buffer. 3329 // Don't check this variable if user has special privileges 3330 // (e.g. unix su command). 3331 if (os::getenv(name, buffer, sizeof(buffer)) && 3332 !os::have_special_privileges()) { 3333 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3334 jio_fprintf(defaultStream::error_stream(), 3335 "Picked up %s: %s\n", name, buffer); 3336 char* rd = buffer; // pointer to the input string (rd) 3337 int i; 3338 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3339 while (isspace(*rd)) rd++; // skip whitespace 3340 if (*rd == 0) break; // we re done when the input string is read completely 3341 3342 // The output, option string, overwrites the input string. 3343 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3344 // input string (rd). 3345 char* wrt = rd; 3346 3347 options[i++].optionString = wrt; // Fill in option 3348 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3349 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3350 int quote = *rd; // matching quote to look for 3351 rd++; // don't copy open quote 3352 while (*rd != quote) { // include everything (even spaces) up until quote 3353 if (*rd == 0) { // string termination means unmatched string 3354 jio_fprintf(defaultStream::error_stream(), 3355 "Unmatched quote in %s\n", name); 3356 return JNI_ERR; 3357 } 3358 *wrt++ = *rd++; // copy to option string 3359 } 3360 rd++; // don't copy close quote 3361 } else { 3362 *wrt++ = *rd++; // copy to option string 3363 } 3364 } 3365 // Need to check if we're done before writing a NULL, 3366 // because the write could be to the byte that rd is pointing to. 3367 if (*rd++ == 0) { 3368 *wrt = 0; 3369 break; 3370 } 3371 *wrt = 0; // Zero terminate option 3372 } 3373 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3374 JavaVMInitArgs vm_args; 3375 vm_args.version = JNI_VERSION_1_2; 3376 vm_args.options = options; 3377 vm_args.nOptions = i; 3378 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3379 3380 if (PrintVMOptions) { 3381 const char* tail; 3382 for (int i = 0; i < vm_args.nOptions; i++) { 3383 const JavaVMOption *option = vm_args.options + i; 3384 if (match_option(option, "-XX:", &tail)) { 3385 logOption(tail); 3386 } 3387 } 3388 } 3389 3390 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR)); 3391 } 3392 return JNI_OK; 3393} 3394 3395void Arguments::set_shared_spaces_flags() { 3396 if (DumpSharedSpaces) { 3397 if (RequireSharedSpaces) { 3398 warning("cannot dump shared archive while using shared archive"); 3399 } 3400 UseSharedSpaces = false; 3401#ifdef _LP64 3402 if (!UseCompressedOops || !UseCompressedClassPointers) { 3403 vm_exit_during_initialization( 3404 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3405 } 3406 } else { 3407 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces. 3408 if (!UseCompressedOops || !UseCompressedClassPointers) { 3409 no_shared_spaces(); 3410 } 3411#endif 3412 } 3413} 3414 3415#if !INCLUDE_ALL_GCS 3416static void force_serial_gc() { 3417 FLAG_SET_DEFAULT(UseSerialGC, true); 3418 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 3419 UNSUPPORTED_GC_OPTION(UseG1GC); 3420 UNSUPPORTED_GC_OPTION(UseParallelGC); 3421 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3422 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3423 UNSUPPORTED_GC_OPTION(UseParNewGC); 3424} 3425#endif // INCLUDE_ALL_GCS 3426 3427// Sharing support 3428// Construct the path to the archive 3429static char* get_shared_archive_path() { 3430 char *shared_archive_path; 3431 if (SharedArchiveFile == NULL) { 3432 char jvm_path[JVM_MAXPATHLEN]; 3433 os::jvm_path(jvm_path, sizeof(jvm_path)); 3434 char *end = strrchr(jvm_path, *os::file_separator()); 3435 if (end != NULL) *end = '\0'; 3436 size_t jvm_path_len = strlen(jvm_path); 3437 size_t file_sep_len = strlen(os::file_separator()); 3438 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3439 file_sep_len + 20, mtInternal); 3440 if (shared_archive_path != NULL) { 3441 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3442 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3443 strncat(shared_archive_path, "classes.jsa", 11); 3444 } 3445 } else { 3446 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3447 if (shared_archive_path != NULL) { 3448 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3449 } 3450 } 3451 return shared_archive_path; 3452} 3453 3454#ifndef PRODUCT 3455// Determine whether LogVMOutput should be implicitly turned on. 3456static bool use_vm_log() { 3457 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3458 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3459 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3460 PrintAssembly || TraceDeoptimization || TraceDependencies || 3461 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3462 return true; 3463 } 3464 3465#ifdef COMPILER1 3466 if (PrintC1Statistics) { 3467 return true; 3468 } 3469#endif // COMPILER1 3470 3471#ifdef COMPILER2 3472 if (PrintOptoAssembly || PrintOptoStatistics) { 3473 return true; 3474 } 3475#endif // COMPILER2 3476 3477 return false; 3478} 3479#endif // PRODUCT 3480 3481// Parse entry point called from JNI_CreateJavaVM 3482 3483jint Arguments::parse(const JavaVMInitArgs* args) { 3484 3485 // Remaining part of option string 3486 const char* tail; 3487 3488 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3489 const char* hotspotrc = ".hotspotrc"; 3490 bool settings_file_specified = false; 3491 bool needs_hotspotrc_warning = false; 3492 3493 const char* flags_file; 3494 int index; 3495 for (index = 0; index < args->nOptions; index++) { 3496 const JavaVMOption *option = args->options + index; 3497 if (match_option(option, "-XX:Flags=", &tail)) { 3498 flags_file = tail; 3499 settings_file_specified = true; 3500 } 3501 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3502 PrintVMOptions = true; 3503 } 3504 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3505 PrintVMOptions = false; 3506 } 3507 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3508 IgnoreUnrecognizedVMOptions = true; 3509 } 3510 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3511 IgnoreUnrecognizedVMOptions = false; 3512 } 3513 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3514 CommandLineFlags::printFlags(tty, false); 3515 vm_exit(0); 3516 } 3517 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3518#if INCLUDE_NMT 3519 MemTracker::init_tracking_options(tail); 3520#else 3521 jio_fprintf(defaultStream::error_stream(), 3522 "Native Memory Tracking is not supported in this VM\n"); 3523 return JNI_ERR; 3524#endif 3525 } 3526 3527 3528#ifndef PRODUCT 3529 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3530 CommandLineFlags::printFlags(tty, true); 3531 vm_exit(0); 3532 } 3533#endif 3534 } 3535 3536 if (IgnoreUnrecognizedVMOptions) { 3537 // uncast const to modify the flag args->ignoreUnrecognized 3538 *(jboolean*)(&args->ignoreUnrecognized) = true; 3539 } 3540 3541 // Parse specified settings file 3542 if (settings_file_specified) { 3543 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3544 return JNI_EINVAL; 3545 } 3546 } else { 3547#ifdef ASSERT 3548 // Parse default .hotspotrc settings file 3549 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3550 return JNI_EINVAL; 3551 } 3552#else 3553 struct stat buf; 3554 if (os::stat(hotspotrc, &buf) == 0) { 3555 needs_hotspotrc_warning = true; 3556 } 3557#endif 3558 } 3559 3560 if (PrintVMOptions) { 3561 for (index = 0; index < args->nOptions; index++) { 3562 const JavaVMOption *option = args->options + index; 3563 if (match_option(option, "-XX:", &tail)) { 3564 logOption(tail); 3565 } 3566 } 3567 } 3568 3569 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3570 jint result = parse_vm_init_args(args); 3571 if (result != JNI_OK) { 3572 return result; 3573 } 3574 3575 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3576 SharedArchivePath = get_shared_archive_path(); 3577 if (SharedArchivePath == NULL) { 3578 return JNI_ENOMEM; 3579 } 3580 3581 // Delay warning until here so that we've had a chance to process 3582 // the -XX:-PrintWarnings flag 3583 if (needs_hotspotrc_warning) { 3584 warning("%s file is present but has been ignored. " 3585 "Run with -XX:Flags=%s to load the file.", 3586 hotspotrc, hotspotrc); 3587 } 3588 3589#ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3590 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3591#endif 3592 3593#if INCLUDE_ALL_GCS 3594 #if (defined JAVASE_EMBEDDED || defined ARM) 3595 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3596 #endif 3597#endif 3598 3599#ifndef PRODUCT 3600 if (TraceBytecodesAt != 0) { 3601 TraceBytecodes = true; 3602 } 3603 if (CountCompiledCalls) { 3604 if (UseCounterDecay) { 3605 warning("UseCounterDecay disabled because CountCalls is set"); 3606 UseCounterDecay = false; 3607 } 3608 } 3609#endif // PRODUCT 3610 3611 // JSR 292 is not supported before 1.7 3612 if (!JDK_Version::is_gte_jdk17x_version()) { 3613 if (EnableInvokeDynamic) { 3614 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3615 warning("JSR 292 is not supported before 1.7. Disabling support."); 3616 } 3617 EnableInvokeDynamic = false; 3618 } 3619 } 3620 3621 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 3622 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3623 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 3624 } 3625 ScavengeRootsInCode = 1; 3626 } 3627 3628 if (PrintGCDetails) { 3629 // Turn on -verbose:gc options as well 3630 PrintGC = true; 3631 } 3632 3633 if (!JDK_Version::is_gte_jdk18x_version()) { 3634 // To avoid changing the log format for 7 updates this flag is only 3635 // true by default in JDK8 and above. 3636 if (FLAG_IS_DEFAULT(PrintGCCause)) { 3637 FLAG_SET_DEFAULT(PrintGCCause, false); 3638 } 3639 } 3640 3641 // Set object alignment values. 3642 set_object_alignment(); 3643 3644#if !INCLUDE_ALL_GCS 3645 force_serial_gc(); 3646#endif // INCLUDE_ALL_GCS 3647#if !INCLUDE_CDS 3648 if (DumpSharedSpaces || RequireSharedSpaces) { 3649 jio_fprintf(defaultStream::error_stream(), 3650 "Shared spaces are not supported in this VM\n"); 3651 return JNI_ERR; 3652 } 3653 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3654 warning("Shared spaces are not supported in this VM"); 3655 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3656 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3657 } 3658 no_shared_spaces(); 3659#endif // INCLUDE_CDS 3660 3661 return JNI_OK; 3662} 3663 3664jint Arguments::apply_ergo() { 3665 3666 // Set flags based on ergonomics. 3667 set_ergonomics_flags(); 3668 3669 set_shared_spaces_flags(); 3670 3671 // Check the GC selections again. 3672 if (!check_gc_consistency()) { 3673 return JNI_EINVAL; 3674 } 3675 3676 if (TieredCompilation) { 3677 set_tiered_flags(); 3678 } else { 3679 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3680 if (CompilationPolicyChoice >= 2) { 3681 vm_exit_during_initialization( 3682 "Incompatible compilation policy selected", NULL); 3683 } 3684 } 3685 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered) 3686 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3687 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M)); 3688 } 3689 3690 3691 // Set heap size based on available physical memory 3692 set_heap_size(); 3693 3694#if INCLUDE_ALL_GCS 3695 // Set per-collector flags 3696 if (UseParallelGC || UseParallelOldGC) { 3697 set_parallel_gc_flags(); 3698 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below 3699 set_cms_and_parnew_gc_flags(); 3700 } else if (UseParNewGC) { // Skipped if CMS is set above 3701 set_parnew_gc_flags(); 3702 } else if (UseG1GC) { 3703 set_g1_gc_flags(); 3704 } 3705 check_deprecated_gcs(); 3706 check_deprecated_gc_flags(); 3707 if (AssumeMP && !UseSerialGC) { 3708 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 3709 warning("If the number of processors is expected to increase from one, then" 3710 " you should configure the number of parallel GC threads appropriately" 3711 " using -XX:ParallelGCThreads=N"); 3712 } 3713 } 3714 if (MinHeapFreeRatio == 100) { 3715 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 3716 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 3717 } 3718#else // INCLUDE_ALL_GCS 3719 assert(verify_serial_gc_flags(), "SerialGC unset"); 3720#endif // INCLUDE_ALL_GCS 3721 3722 // Initialize Metaspace flags and alignments 3723 Metaspace::ergo_initialize(); 3724 3725 // Set bytecode rewriting flags 3726 set_bytecode_flags(); 3727 3728 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 3729 set_aggressive_opts_flags(); 3730 3731 // Turn off biased locking for locking debug mode flags, 3732 // which are subtly different from each other but neither works with 3733 // biased locking 3734 if (UseHeavyMonitors 3735#ifdef COMPILER1 3736 || !UseFastLocking 3737#endif // COMPILER1 3738 ) { 3739 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3740 // flag set to true on command line; warn the user that they 3741 // can't enable biased locking here 3742 warning("Biased Locking is not supported with locking debug flags" 3743 "; ignoring UseBiasedLocking flag." ); 3744 } 3745 UseBiasedLocking = false; 3746 } 3747 3748#ifdef ZERO 3749 // Clear flags not supported on zero. 3750 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3751 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3752 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3753 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3754#endif // CC_INTERP 3755 3756#ifdef COMPILER2 3757 if (!UseBiasedLocking || EmitSync != 0) { 3758 UseOptoBiasInlining = false; 3759 } 3760 if (!EliminateLocks) { 3761 EliminateNestedLocks = false; 3762 } 3763 if (!Inline) { 3764 IncrementalInline = false; 3765 } 3766#ifndef PRODUCT 3767 if (!IncrementalInline) { 3768 AlwaysIncrementalInline = false; 3769 } 3770#endif 3771 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) { 3772 // incremental inlining: bump MaxNodeLimit 3773 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000); 3774 } 3775 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 3776 // nothing to use the profiling, turn if off 3777 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 3778 } 3779 if (UseTypeSpeculation && FLAG_IS_DEFAULT(ReplaceInParentMaps)) { 3780 // Doing the replace in parent maps helps speculation 3781 FLAG_SET_DEFAULT(ReplaceInParentMaps, true); 3782 } 3783#endif 3784 3785 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3786 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3787 DebugNonSafepoints = true; 3788 } 3789 3790 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3791 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3792 } 3793 3794#ifndef PRODUCT 3795 if (CompileTheWorld) { 3796 // Force NmethodSweeper to sweep whole CodeCache each time. 3797 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3798 NmethodSweepFraction = 1; 3799 } 3800 } 3801 3802 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3803 if (use_vm_log()) { 3804 LogVMOutput = true; 3805 } 3806 } 3807#endif // PRODUCT 3808 3809 if (PrintCommandLineFlags) { 3810 CommandLineFlags::printSetFlags(tty); 3811 } 3812 3813 // Apply CPU specific policy for the BiasedLocking 3814 if (UseBiasedLocking) { 3815 if (!VM_Version::use_biased_locking() && 3816 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3817 UseBiasedLocking = false; 3818 } 3819 } 3820 3821 return JNI_OK; 3822} 3823 3824jint Arguments::adjust_after_os() { 3825 if (UseNUMA) { 3826 if (UseParallelGC || UseParallelOldGC) { 3827 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3828 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3829 } 3830 } 3831 // UseNUMAInterleaving is set to ON for all collectors and 3832 // platforms when UseNUMA is set to ON. NUMA-aware collectors 3833 // such as the parallel collector for Linux and Solaris will 3834 // interleave old gen and survivor spaces on top of NUMA 3835 // allocation policy for the eden space. 3836 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 3837 // all platforms and ParallelGC on Windows will interleave all 3838 // of the heap spaces across NUMA nodes. 3839 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 3840 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 3841 } 3842 } 3843 return JNI_OK; 3844} 3845 3846int Arguments::PropertyList_count(SystemProperty* pl) { 3847 int count = 0; 3848 while(pl != NULL) { 3849 count++; 3850 pl = pl->next(); 3851 } 3852 return count; 3853} 3854 3855const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3856 assert(key != NULL, "just checking"); 3857 SystemProperty* prop; 3858 for (prop = pl; prop != NULL; prop = prop->next()) { 3859 if (strcmp(key, prop->key()) == 0) return prop->value(); 3860 } 3861 return NULL; 3862} 3863 3864const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3865 int count = 0; 3866 const char* ret_val = NULL; 3867 3868 while(pl != NULL) { 3869 if(count >= index) { 3870 ret_val = pl->key(); 3871 break; 3872 } 3873 count++; 3874 pl = pl->next(); 3875 } 3876 3877 return ret_val; 3878} 3879 3880char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3881 int count = 0; 3882 char* ret_val = NULL; 3883 3884 while(pl != NULL) { 3885 if(count >= index) { 3886 ret_val = pl->value(); 3887 break; 3888 } 3889 count++; 3890 pl = pl->next(); 3891 } 3892 3893 return ret_val; 3894} 3895 3896void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3897 SystemProperty* p = *plist; 3898 if (p == NULL) { 3899 *plist = new_p; 3900 } else { 3901 while (p->next() != NULL) { 3902 p = p->next(); 3903 } 3904 p->set_next(new_p); 3905 } 3906} 3907 3908void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3909 if (plist == NULL) 3910 return; 3911 3912 SystemProperty* new_p = new SystemProperty(k, v, true); 3913 PropertyList_add(plist, new_p); 3914} 3915 3916// This add maintains unique property key in the list. 3917void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3918 if (plist == NULL) 3919 return; 3920 3921 // If property key exist then update with new value. 3922 SystemProperty* prop; 3923 for (prop = *plist; prop != NULL; prop = prop->next()) { 3924 if (strcmp(k, prop->key()) == 0) { 3925 if (append) { 3926 prop->append_value(v); 3927 } else { 3928 prop->set_value(v); 3929 } 3930 return; 3931 } 3932 } 3933 3934 PropertyList_add(plist, k, v); 3935} 3936 3937// Copies src into buf, replacing "%%" with "%" and "%p" with pid 3938// Returns true if all of the source pointed by src has been copied over to 3939// the destination buffer pointed by buf. Otherwise, returns false. 3940// Notes: 3941// 1. If the length (buflen) of the destination buffer excluding the 3942// NULL terminator character is not long enough for holding the expanded 3943// pid characters, it also returns false instead of returning the partially 3944// expanded one. 3945// 2. The passed in "buflen" should be large enough to hold the null terminator. 3946bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3947 char* buf, size_t buflen) { 3948 const char* p = src; 3949 char* b = buf; 3950 const char* src_end = &src[srclen]; 3951 char* buf_end = &buf[buflen - 1]; 3952 3953 while (p < src_end && b < buf_end) { 3954 if (*p == '%') { 3955 switch (*(++p)) { 3956 case '%': // "%%" ==> "%" 3957 *b++ = *p++; 3958 break; 3959 case 'p': { // "%p" ==> current process id 3960 // buf_end points to the character before the last character so 3961 // that we could write '\0' to the end of the buffer. 3962 size_t buf_sz = buf_end - b + 1; 3963 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3964 3965 // if jio_snprintf fails or the buffer is not long enough to hold 3966 // the expanded pid, returns false. 3967 if (ret < 0 || ret >= (int)buf_sz) { 3968 return false; 3969 } else { 3970 b += ret; 3971 assert(*b == '\0', "fail in copy_expand_pid"); 3972 if (p == src_end && b == buf_end + 1) { 3973 // reach the end of the buffer. 3974 return true; 3975 } 3976 } 3977 p++; 3978 break; 3979 } 3980 default : 3981 *b++ = '%'; 3982 } 3983 } else { 3984 *b++ = *p++; 3985 } 3986 } 3987 *b = '\0'; 3988 return (p == src_end); // return false if not all of the source was copied 3989} 3990