arguments.cpp revision 4677:8bcfd9ce2c6b
1275970Scy/* 2275970Scy * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. 3275970Scy * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4275970Scy * 5275970Scy * This code is free software; you can redistribute it and/or modify it 6275970Scy * under the terms of the GNU General Public License version 2 only, as 7275970Scy * published by the Free Software Foundation. 8275970Scy * 9275970Scy * This code is distributed in the hope that it will be useful, but WITHOUT 10275970Scy * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11275970Scy * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12275970Scy * version 2 for more details (a copy is included in the LICENSE file that 13275970Scy * accompanied this code). 14275970Scy * 15275970Scy * You should have received a copy of the GNU General Public License version 16275970Scy * 2 along with this work; if not, write to the Free Software Foundation, 17275970Scy * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18275970Scy * 19275970Scy * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20275970Scy * or visit www.oracle.com if you need additional information or have any 21275970Scy * questions. 22275970Scy * 23275970Scy */ 24275970Scy 25275970Scy#include "precompiled.hpp" 26275970Scy#include "classfile/javaAssertions.hpp" 27275970Scy#include "classfile/symbolTable.hpp" 28275970Scy#include "compiler/compilerOracle.hpp" 29275970Scy#include "memory/allocation.inline.hpp" 30275970Scy#include "memory/cardTableRS.hpp" 31275970Scy#include "memory/referenceProcessor.hpp" 32275970Scy#include "memory/universe.inline.hpp" 33275970Scy#include "oops/oop.inline.hpp" 34275970Scy#include "prims/jvmtiExport.hpp" 35275970Scy#include "runtime/arguments.hpp" 36275970Scy#include "runtime/globals_extension.hpp" 37275970Scy#include "runtime/java.hpp" 38275970Scy#include "services/management.hpp" 39275970Scy#include "services/memTracker.hpp" 40275970Scy#include "utilities/defaultStream.hpp" 41275970Scy#include "utilities/macros.hpp" 42275970Scy#include "utilities/taskqueue.hpp" 43275970Scy#ifdef TARGET_OS_FAMILY_linux 44275970Scy# include "os_linux.inline.hpp" 45275970Scy#endif 46275970Scy#ifdef TARGET_OS_FAMILY_solaris 47275970Scy# include "os_solaris.inline.hpp" 48275970Scy#endif 49275970Scy#ifdef TARGET_OS_FAMILY_windows 50275970Scy# include "os_windows.inline.hpp" 51275970Scy#endif 52275970Scy#ifdef TARGET_OS_FAMILY_bsd 53275970Scy# include "os_bsd.inline.hpp" 54275970Scy#endif 55275970Scy#if INCLUDE_ALL_GCS 56275970Scy#include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 57275970Scy#endif // INCLUDE_ALL_GCS 58275970Scy 59275970Scy// Note: This is a special bug reporting site for the JVM 60275970Scy#define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp" 61275970Scy#define DEFAULT_JAVA_LAUNCHER "generic" 62275970Scy 63275970Scychar** Arguments::_jvm_flags_array = NULL; 64275970Scyint Arguments::_num_jvm_flags = 0; 65275970Scychar** Arguments::_jvm_args_array = NULL; 66275970Scyint Arguments::_num_jvm_args = 0; 67275970Scychar* Arguments::_java_command = NULL; 68275970ScySystemProperty* Arguments::_system_properties = NULL; 69275970Scyconst char* Arguments::_gc_log_filename = NULL; 70275970Scybool Arguments::_has_profile = false; 71275970Scybool Arguments::_has_alloc_profile = false; 72275970Scyuintx Arguments::_min_heap_size = 0; 73275970ScyArguments::Mode Arguments::_mode = _mixed; 74275970Scybool Arguments::_java_compiler = false; 75275970Scybool Arguments::_xdebug_mode = false; 76275970Scyconst char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 77275970Scyconst char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 78275970Scyint Arguments::_sun_java_launcher_pid = -1; 79275970Scybool Arguments::_created_by_gamma_launcher = false; 80275970Scy 81275970Scy// These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 82275970Scybool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 83275970Scybool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 84275970Scybool Arguments::_BackgroundCompilation = BackgroundCompilation; 85275970Scybool Arguments::_ClipInlining = ClipInlining; 86275970Scy 87275970Scychar* Arguments::SharedArchivePath = NULL; 88280849Scy 89275970ScyAgentLibraryList Arguments::_libraryList; 90275970ScyAgentLibraryList Arguments::_agentList; 91275970Scy 92275970Scyabort_hook_t Arguments::_abort_hook = NULL; 93280849Scyexit_hook_t Arguments::_exit_hook = NULL; 94275970Scyvfprintf_hook_t Arguments::_vfprintf_hook = NULL; 95275970Scy 96275970Scy 97275970ScySystemProperty *Arguments::_java_ext_dirs = NULL; 98275970ScySystemProperty *Arguments::_java_endorsed_dirs = NULL; 99275970ScySystemProperty *Arguments::_sun_boot_library_path = NULL; 100275970ScySystemProperty *Arguments::_java_library_path = NULL; 101275970ScySystemProperty *Arguments::_java_home = NULL; 102275970ScySystemProperty *Arguments::_java_class_path = NULL; 103275970ScySystemProperty *Arguments::_sun_boot_class_path = NULL; 104275970Scy 105275970Scychar* Arguments::_meta_index_path = NULL; 106275970Scychar* Arguments::_meta_index_dir = NULL; 107275970Scy 108275970Scy// Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 109275970Scy 110275970Scystatic bool match_option(const JavaVMOption *option, const char* name, 111275970Scy const char** tail) { 112275970Scy int len = (int)strlen(name); 113275970Scy if (strncmp(option->optionString, name, len) == 0) { 114275970Scy *tail = option->optionString + len; 115275970Scy return true; 116275970Scy } else { 117275970Scy return false; 118275970Scy } 119275970Scy} 120275970Scy 121275970Scystatic void logOption(const char* opt) { 122275970Scy if (PrintVMOptions) { 123275970Scy jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 124275970Scy } 125275970Scy} 126275970Scy 127275970Scy// Process java launcher properties. 128275970Scyvoid Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 129275970Scy // See if sun.java.launcher or sun.java.launcher.pid is defined. 130275970Scy // Must do this before setting up other system properties, 131275970Scy // as some of them may depend on launcher type. 132 for (int index = 0; index < args->nOptions; index++) { 133 const JavaVMOption* option = args->options + index; 134 const char* tail; 135 136 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 137 process_java_launcher_argument(tail, option->extraInfo); 138 continue; 139 } 140 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 141 _sun_java_launcher_pid = atoi(tail); 142 continue; 143 } 144 } 145} 146 147// Initialize system properties key and value. 148void Arguments::init_system_properties() { 149 150 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 151 "Java Virtual Machine Specification", false)); 152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 153 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 154 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 155 156 // following are JVMTI agent writeable properties. 157 // Properties values are set to NULL and they are 158 // os specific they are initialized in os::init_system_properties_values(). 159 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 160 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 161 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 162 _java_library_path = new SystemProperty("java.library.path", NULL, true); 163 _java_home = new SystemProperty("java.home", NULL, true); 164 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 165 166 _java_class_path = new SystemProperty("java.class.path", "", true); 167 168 // Add to System Property list. 169 PropertyList_add(&_system_properties, _java_ext_dirs); 170 PropertyList_add(&_system_properties, _java_endorsed_dirs); 171 PropertyList_add(&_system_properties, _sun_boot_library_path); 172 PropertyList_add(&_system_properties, _java_library_path); 173 PropertyList_add(&_system_properties, _java_home); 174 PropertyList_add(&_system_properties, _java_class_path); 175 PropertyList_add(&_system_properties, _sun_boot_class_path); 176 177 // Set OS specific system properties values 178 os::init_system_properties_values(); 179} 180 181 182 // Update/Initialize System properties after JDK version number is known 183void Arguments::init_version_specific_system_properties() { 184 enum { bufsz = 16 }; 185 char buffer[bufsz]; 186 const char* spec_vendor = "Sun Microsystems Inc."; 187 uint32_t spec_version = 0; 188 189 if (JDK_Version::is_gte_jdk17x_version()) { 190 spec_vendor = "Oracle Corporation"; 191 spec_version = JDK_Version::current().major_version(); 192 } 193 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 194 195 PropertyList_add(&_system_properties, 196 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 197 PropertyList_add(&_system_properties, 198 new SystemProperty("java.vm.specification.version", buffer, false)); 199 PropertyList_add(&_system_properties, 200 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 201} 202 203/** 204 * Provide a slightly more user-friendly way of eliminating -XX flags. 205 * When a flag is eliminated, it can be added to this list in order to 206 * continue accepting this flag on the command-line, while issuing a warning 207 * and ignoring the value. Once the JDK version reaches the 'accept_until' 208 * limit, we flatly refuse to admit the existence of the flag. This allows 209 * a flag to die correctly over JDK releases using HSX. 210 */ 211typedef struct { 212 const char* name; 213 JDK_Version obsoleted_in; // when the flag went away 214 JDK_Version accept_until; // which version to start denying the existence 215} ObsoleteFlag; 216 217static ObsoleteFlag obsolete_jvm_flags[] = { 218 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 219 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 220 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 221 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 222 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 223 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 224 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 225 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 226 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 227 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 228 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 229 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 230 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 231 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 232 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 233 { "DefaultInitialRAMFraction", 234 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 235 { "UseDepthFirstScavengeOrder", 236 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 237 { "HandlePromotionFailure", 238 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 239 { "MaxLiveObjectEvacuationRatio", 240 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 241 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 242 { "UseParallelOldGCCompacting", 243 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 244 { "UseParallelDensePrefixUpdate", 245 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 246 { "UseParallelOldGCDensePrefix", 247 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 248 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 249 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 250 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 251 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 252 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 253 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 254 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 255 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 256 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 257 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 258 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 259 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 260 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 261 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 262 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 263 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 264#ifdef PRODUCT 265 { "DesiredMethodLimit", 266 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 267#endif // PRODUCT 268 { NULL, JDK_Version(0), JDK_Version(0) } 269}; 270 271// Returns true if the flag is obsolete and fits into the range specified 272// for being ignored. In the case that the flag is ignored, the 'version' 273// value is filled in with the version number when the flag became 274// obsolete so that that value can be displayed to the user. 275bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 276 int i = 0; 277 assert(version != NULL, "Must provide a version buffer"); 278 while (obsolete_jvm_flags[i].name != NULL) { 279 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 280 // <flag>=xxx form 281 // [-|+]<flag> form 282 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 283 ((s[0] == '+' || s[0] == '-') && 284 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 285 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 286 *version = flag_status.obsoleted_in; 287 return true; 288 } 289 } 290 i++; 291 } 292 return false; 293} 294 295// Constructs the system class path (aka boot class path) from the following 296// components, in order: 297// 298// prefix // from -Xbootclasspath/p:... 299// endorsed // the expansion of -Djava.endorsed.dirs=... 300// base // from os::get_system_properties() or -Xbootclasspath= 301// suffix // from -Xbootclasspath/a:... 302// 303// java.endorsed.dirs is a list of directories; any jar or zip files in the 304// directories are added to the sysclasspath just before the base. 305// 306// This could be AllStatic, but it isn't needed after argument processing is 307// complete. 308class SysClassPath: public StackObj { 309public: 310 SysClassPath(const char* base); 311 ~SysClassPath(); 312 313 inline void set_base(const char* base); 314 inline void add_prefix(const char* prefix); 315 inline void add_suffix_to_prefix(const char* suffix); 316 inline void add_suffix(const char* suffix); 317 inline void reset_path(const char* base); 318 319 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 320 // property. Must be called after all command-line arguments have been 321 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 322 // combined_path(). 323 void expand_endorsed(); 324 325 inline const char* get_base() const { return _items[_scp_base]; } 326 inline const char* get_prefix() const { return _items[_scp_prefix]; } 327 inline const char* get_suffix() const { return _items[_scp_suffix]; } 328 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 329 330 // Combine all the components into a single c-heap-allocated string; caller 331 // must free the string if/when no longer needed. 332 char* combined_path(); 333 334private: 335 // Utility routines. 336 static char* add_to_path(const char* path, const char* str, bool prepend); 337 static char* add_jars_to_path(char* path, const char* directory); 338 339 inline void reset_item_at(int index); 340 341 // Array indices for the items that make up the sysclasspath. All except the 342 // base are allocated in the C heap and freed by this class. 343 enum { 344 _scp_prefix, // from -Xbootclasspath/p:... 345 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 346 _scp_base, // the default sysclasspath 347 _scp_suffix, // from -Xbootclasspath/a:... 348 _scp_nitems // the number of items, must be last. 349 }; 350 351 const char* _items[_scp_nitems]; 352 DEBUG_ONLY(bool _expansion_done;) 353}; 354 355SysClassPath::SysClassPath(const char* base) { 356 memset(_items, 0, sizeof(_items)); 357 _items[_scp_base] = base; 358 DEBUG_ONLY(_expansion_done = false;) 359} 360 361SysClassPath::~SysClassPath() { 362 // Free everything except the base. 363 for (int i = 0; i < _scp_nitems; ++i) { 364 if (i != _scp_base) reset_item_at(i); 365 } 366 DEBUG_ONLY(_expansion_done = false;) 367} 368 369inline void SysClassPath::set_base(const char* base) { 370 _items[_scp_base] = base; 371} 372 373inline void SysClassPath::add_prefix(const char* prefix) { 374 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 375} 376 377inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 378 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 379} 380 381inline void SysClassPath::add_suffix(const char* suffix) { 382 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 383} 384 385inline void SysClassPath::reset_item_at(int index) { 386 assert(index < _scp_nitems && index != _scp_base, "just checking"); 387 if (_items[index] != NULL) { 388 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 389 _items[index] = NULL; 390 } 391} 392 393inline void SysClassPath::reset_path(const char* base) { 394 // Clear the prefix and suffix. 395 reset_item_at(_scp_prefix); 396 reset_item_at(_scp_suffix); 397 set_base(base); 398} 399 400//------------------------------------------------------------------------------ 401 402void SysClassPath::expand_endorsed() { 403 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 404 405 const char* path = Arguments::get_property("java.endorsed.dirs"); 406 if (path == NULL) { 407 path = Arguments::get_endorsed_dir(); 408 assert(path != NULL, "no default for java.endorsed.dirs"); 409 } 410 411 char* expanded_path = NULL; 412 const char separator = *os::path_separator(); 413 const char* const end = path + strlen(path); 414 while (path < end) { 415 const char* tmp_end = strchr(path, separator); 416 if (tmp_end == NULL) { 417 expanded_path = add_jars_to_path(expanded_path, path); 418 path = end; 419 } else { 420 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 421 memcpy(dirpath, path, tmp_end - path); 422 dirpath[tmp_end - path] = '\0'; 423 expanded_path = add_jars_to_path(expanded_path, dirpath); 424 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 425 path = tmp_end + 1; 426 } 427 } 428 _items[_scp_endorsed] = expanded_path; 429 DEBUG_ONLY(_expansion_done = true;) 430} 431 432// Combine the bootclasspath elements, some of which may be null, into a single 433// c-heap-allocated string. 434char* SysClassPath::combined_path() { 435 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 436 assert(_expansion_done, "must call expand_endorsed() first."); 437 438 size_t lengths[_scp_nitems]; 439 size_t total_len = 0; 440 441 const char separator = *os::path_separator(); 442 443 // Get the lengths. 444 int i; 445 for (i = 0; i < _scp_nitems; ++i) { 446 if (_items[i] != NULL) { 447 lengths[i] = strlen(_items[i]); 448 // Include space for the separator char (or a NULL for the last item). 449 total_len += lengths[i] + 1; 450 } 451 } 452 assert(total_len > 0, "empty sysclasspath not allowed"); 453 454 // Copy the _items to a single string. 455 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 456 char* cp_tmp = cp; 457 for (i = 0; i < _scp_nitems; ++i) { 458 if (_items[i] != NULL) { 459 memcpy(cp_tmp, _items[i], lengths[i]); 460 cp_tmp += lengths[i]; 461 *cp_tmp++ = separator; 462 } 463 } 464 *--cp_tmp = '\0'; // Replace the extra separator. 465 return cp; 466} 467 468// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 469char* 470SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 471 char *cp; 472 473 assert(str != NULL, "just checking"); 474 if (path == NULL) { 475 size_t len = strlen(str) + 1; 476 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 477 memcpy(cp, str, len); // copy the trailing null 478 } else { 479 const char separator = *os::path_separator(); 480 size_t old_len = strlen(path); 481 size_t str_len = strlen(str); 482 size_t len = old_len + str_len + 2; 483 484 if (prepend) { 485 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 486 char* cp_tmp = cp; 487 memcpy(cp_tmp, str, str_len); 488 cp_tmp += str_len; 489 *cp_tmp = separator; 490 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 491 FREE_C_HEAP_ARRAY(char, path, mtInternal); 492 } else { 493 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 494 char* cp_tmp = cp + old_len; 495 *cp_tmp = separator; 496 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 497 } 498 } 499 return cp; 500} 501 502// Scan the directory and append any jar or zip files found to path. 503// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 504char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 505 DIR* dir = os::opendir(directory); 506 if (dir == NULL) return path; 507 508 char dir_sep[2] = { '\0', '\0' }; 509 size_t directory_len = strlen(directory); 510 const char fileSep = *os::file_separator(); 511 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 512 513 /* Scan the directory for jars/zips, appending them to path. */ 514 struct dirent *entry; 515 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 516 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 517 const char* name = entry->d_name; 518 const char* ext = name + strlen(name) - 4; 519 bool isJarOrZip = ext > name && 520 (os::file_name_strcmp(ext, ".jar") == 0 || 521 os::file_name_strcmp(ext, ".zip") == 0); 522 if (isJarOrZip) { 523 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 524 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 525 path = add_to_path(path, jarpath, false); 526 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 527 } 528 } 529 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 530 os::closedir(dir); 531 return path; 532} 533 534// Parses a memory size specification string. 535static bool atomull(const char *s, julong* result) { 536 julong n = 0; 537 int args_read = sscanf(s, JULONG_FORMAT, &n); 538 if (args_read != 1) { 539 return false; 540 } 541 while (*s != '\0' && isdigit(*s)) { 542 s++; 543 } 544 // 4705540: illegal if more characters are found after the first non-digit 545 if (strlen(s) > 1) { 546 return false; 547 } 548 switch (*s) { 549 case 'T': case 't': 550 *result = n * G * K; 551 // Check for overflow. 552 if (*result/((julong)G * K) != n) return false; 553 return true; 554 case 'G': case 'g': 555 *result = n * G; 556 if (*result/G != n) return false; 557 return true; 558 case 'M': case 'm': 559 *result = n * M; 560 if (*result/M != n) return false; 561 return true; 562 case 'K': case 'k': 563 *result = n * K; 564 if (*result/K != n) return false; 565 return true; 566 case '\0': 567 *result = n; 568 return true; 569 default: 570 return false; 571 } 572} 573 574Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 575 if (size < min_size) return arg_too_small; 576 // Check that size will fit in a size_t (only relevant on 32-bit) 577 if (size > max_uintx) return arg_too_big; 578 return arg_in_range; 579} 580 581// Describe an argument out of range error 582void Arguments::describe_range_error(ArgsRange errcode) { 583 switch(errcode) { 584 case arg_too_big: 585 jio_fprintf(defaultStream::error_stream(), 586 "The specified size exceeds the maximum " 587 "representable size.\n"); 588 break; 589 case arg_too_small: 590 case arg_unreadable: 591 case arg_in_range: 592 // do nothing for now 593 break; 594 default: 595 ShouldNotReachHere(); 596 } 597} 598 599static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) { 600 return CommandLineFlags::boolAtPut(name, &value, origin); 601} 602 603static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 604 double v; 605 if (sscanf(value, "%lf", &v) != 1) { 606 return false; 607 } 608 609 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 610 return true; 611 } 612 return false; 613} 614 615static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 616 julong v; 617 intx intx_v; 618 bool is_neg = false; 619 // Check the sign first since atomull() parses only unsigned values. 620 if (*value == '-') { 621 if (!CommandLineFlags::intxAt(name, &intx_v)) { 622 return false; 623 } 624 value++; 625 is_neg = true; 626 } 627 if (!atomull(value, &v)) { 628 return false; 629 } 630 intx_v = (intx) v; 631 if (is_neg) { 632 intx_v = -intx_v; 633 } 634 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 635 return true; 636 } 637 uintx uintx_v = (uintx) v; 638 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 639 return true; 640 } 641 uint64_t uint64_t_v = (uint64_t) v; 642 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 643 return true; 644 } 645 return false; 646} 647 648static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) { 649 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 650 // Contract: CommandLineFlags always returns a pointer that needs freeing. 651 FREE_C_HEAP_ARRAY(char, value, mtInternal); 652 return true; 653} 654 655static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) { 656 const char* old_value = ""; 657 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 658 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 659 size_t new_len = strlen(new_value); 660 const char* value; 661 char* free_this_too = NULL; 662 if (old_len == 0) { 663 value = new_value; 664 } else if (new_len == 0) { 665 value = old_value; 666 } else { 667 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 668 // each new setting adds another LINE to the switch: 669 sprintf(buf, "%s\n%s", old_value, new_value); 670 value = buf; 671 free_this_too = buf; 672 } 673 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 674 // CommandLineFlags always returns a pointer that needs freeing. 675 FREE_C_HEAP_ARRAY(char, value, mtInternal); 676 if (free_this_too != NULL) { 677 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 678 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 679 } 680 return true; 681} 682 683bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) { 684 685 // range of acceptable characters spelled out for portability reasons 686#define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 687#define BUFLEN 255 688 char name[BUFLEN+1]; 689 char dummy; 690 691 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 692 return set_bool_flag(name, false, origin); 693 } 694 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 695 return set_bool_flag(name, true, origin); 696 } 697 698 char punct; 699 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 700 const char* value = strchr(arg, '=') + 1; 701 Flag* flag = Flag::find_flag(name, strlen(name)); 702 if (flag != NULL && flag->is_ccstr()) { 703 if (flag->ccstr_accumulates()) { 704 return append_to_string_flag(name, value, origin); 705 } else { 706 if (value[0] == '\0') { 707 value = NULL; 708 } 709 return set_string_flag(name, value, origin); 710 } 711 } 712 } 713 714 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 715 const char* value = strchr(arg, '=') + 1; 716 // -XX:Foo:=xxx will reset the string flag to the given value. 717 if (value[0] == '\0') { 718 value = NULL; 719 } 720 return set_string_flag(name, value, origin); 721 } 722 723#define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 724#define SIGNED_NUMBER_RANGE "[-0123456789]" 725#define NUMBER_RANGE "[0123456789]" 726 char value[BUFLEN + 1]; 727 char value2[BUFLEN + 1]; 728 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 729 // Looks like a floating-point number -- try again with more lenient format string 730 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 731 return set_fp_numeric_flag(name, value, origin); 732 } 733 } 734 735#define VALUE_RANGE "[-kmgtKMGT0123456789]" 736 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 737 return set_numeric_flag(name, value, origin); 738 } 739 740 return false; 741} 742 743void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 744 assert(bldarray != NULL, "illegal argument"); 745 746 if (arg == NULL) { 747 return; 748 } 749 750 int new_count = *count + 1; 751 752 // expand the array and add arg to the last element 753 if (*bldarray == NULL) { 754 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 755 } else { 756 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 757 } 758 (*bldarray)[*count] = strdup(arg); 759 *count = new_count; 760} 761 762void Arguments::build_jvm_args(const char* arg) { 763 add_string(&_jvm_args_array, &_num_jvm_args, arg); 764} 765 766void Arguments::build_jvm_flags(const char* arg) { 767 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 768} 769 770// utility function to return a string that concatenates all 771// strings in a given char** array 772const char* Arguments::build_resource_string(char** args, int count) { 773 if (args == NULL || count == 0) { 774 return NULL; 775 } 776 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 777 for (int i = 1; i < count; i++) { 778 length += strlen(args[i]) + 1; // add 1 for a space 779 } 780 char* s = NEW_RESOURCE_ARRAY(char, length); 781 strcpy(s, args[0]); 782 for (int j = 1; j < count; j++) { 783 strcat(s, " "); 784 strcat(s, args[j]); 785 } 786 return (const char*) s; 787} 788 789void Arguments::print_on(outputStream* st) { 790 st->print_cr("VM Arguments:"); 791 if (num_jvm_flags() > 0) { 792 st->print("jvm_flags: "); print_jvm_flags_on(st); 793 } 794 if (num_jvm_args() > 0) { 795 st->print("jvm_args: "); print_jvm_args_on(st); 796 } 797 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 798 if (_java_class_path != NULL) { 799 char* path = _java_class_path->value(); 800 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 801 } 802 st->print_cr("Launcher Type: %s", _sun_java_launcher); 803} 804 805void Arguments::print_jvm_flags_on(outputStream* st) { 806 if (_num_jvm_flags > 0) { 807 for (int i=0; i < _num_jvm_flags; i++) { 808 st->print("%s ", _jvm_flags_array[i]); 809 } 810 st->print_cr(""); 811 } 812} 813 814void Arguments::print_jvm_args_on(outputStream* st) { 815 if (_num_jvm_args > 0) { 816 for (int i=0; i < _num_jvm_args; i++) { 817 st->print("%s ", _jvm_args_array[i]); 818 } 819 st->print_cr(""); 820 } 821} 822 823bool Arguments::process_argument(const char* arg, 824 jboolean ignore_unrecognized, FlagValueOrigin origin) { 825 826 JDK_Version since = JDK_Version(); 827 828 if (parse_argument(arg, origin) || ignore_unrecognized) { 829 return true; 830 } 831 832 bool has_plus_minus = (*arg == '+' || *arg == '-'); 833 const char* const argname = has_plus_minus ? arg + 1 : arg; 834 if (is_newly_obsolete(arg, &since)) { 835 char version[256]; 836 since.to_string(version, sizeof(version)); 837 warning("ignoring option %s; support was removed in %s", argname, version); 838 return true; 839 } 840 841 // For locked flags, report a custom error message if available. 842 // Otherwise, report the standard unrecognized VM option. 843 844 size_t arg_len; 845 const char* equal_sign = strchr(argname, '='); 846 if (equal_sign == NULL) { 847 arg_len = strlen(argname); 848 } else { 849 arg_len = equal_sign - argname; 850 } 851 852 Flag* found_flag = Flag::find_flag((char*)argname, arg_len, true); 853 if (found_flag != NULL) { 854 char locked_message_buf[BUFLEN]; 855 found_flag->get_locked_message(locked_message_buf, BUFLEN); 856 if (strlen(locked_message_buf) == 0) { 857 if (found_flag->is_bool() && !has_plus_minus) { 858 jio_fprintf(defaultStream::error_stream(), 859 "Missing +/- setting for VM option '%s'\n", argname); 860 } else if (!found_flag->is_bool() && has_plus_minus) { 861 jio_fprintf(defaultStream::error_stream(), 862 "Unexpected +/- setting in VM option '%s'\n", argname); 863 } else { 864 jio_fprintf(defaultStream::error_stream(), 865 "Improperly specified VM option '%s'\n", argname); 866 } 867 } else { 868 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 869 } 870 } else { 871 jio_fprintf(defaultStream::error_stream(), 872 "Unrecognized VM option '%s'\n", argname); 873 } 874 875 // allow for commandline "commenting out" options like -XX:#+Verbose 876 return arg[0] == '#'; 877} 878 879bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 880 FILE* stream = fopen(file_name, "rb"); 881 if (stream == NULL) { 882 if (should_exist) { 883 jio_fprintf(defaultStream::error_stream(), 884 "Could not open settings file %s\n", file_name); 885 return false; 886 } else { 887 return true; 888 } 889 } 890 891 char token[1024]; 892 int pos = 0; 893 894 bool in_white_space = true; 895 bool in_comment = false; 896 bool in_quote = false; 897 char quote_c = 0; 898 bool result = true; 899 900 int c = getc(stream); 901 while(c != EOF && pos < (int)(sizeof(token)-1)) { 902 if (in_white_space) { 903 if (in_comment) { 904 if (c == '\n') in_comment = false; 905 } else { 906 if (c == '#') in_comment = true; 907 else if (!isspace(c)) { 908 in_white_space = false; 909 token[pos++] = c; 910 } 911 } 912 } else { 913 if (c == '\n' || (!in_quote && isspace(c))) { 914 // token ends at newline, or at unquoted whitespace 915 // this allows a way to include spaces in string-valued options 916 token[pos] = '\0'; 917 logOption(token); 918 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 919 build_jvm_flags(token); 920 pos = 0; 921 in_white_space = true; 922 in_quote = false; 923 } else if (!in_quote && (c == '\'' || c == '"')) { 924 in_quote = true; 925 quote_c = c; 926 } else if (in_quote && (c == quote_c)) { 927 in_quote = false; 928 } else { 929 token[pos++] = c; 930 } 931 } 932 c = getc(stream); 933 } 934 if (pos > 0) { 935 token[pos] = '\0'; 936 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 937 build_jvm_flags(token); 938 } 939 fclose(stream); 940 return result; 941} 942 943//============================================================================================================= 944// Parsing of properties (-D) 945 946const char* Arguments::get_property(const char* key) { 947 return PropertyList_get_value(system_properties(), key); 948} 949 950bool Arguments::add_property(const char* prop) { 951 const char* eq = strchr(prop, '='); 952 char* key; 953 // ns must be static--its address may be stored in a SystemProperty object. 954 const static char ns[1] = {0}; 955 char* value = (char *)ns; 956 957 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 958 key = AllocateHeap(key_len + 1, mtInternal); 959 strncpy(key, prop, key_len); 960 key[key_len] = '\0'; 961 962 if (eq != NULL) { 963 size_t value_len = strlen(prop) - key_len - 1; 964 value = AllocateHeap(value_len + 1, mtInternal); 965 strncpy(value, &prop[key_len + 1], value_len + 1); 966 } 967 968 if (strcmp(key, "java.compiler") == 0) { 969 process_java_compiler_argument(value); 970 FreeHeap(key); 971 if (eq != NULL) { 972 FreeHeap(value); 973 } 974 return true; 975 } else if (strcmp(key, "sun.java.command") == 0) { 976 _java_command = value; 977 978 // Record value in Arguments, but let it get passed to Java. 979 } else if (strcmp(key, "sun.java.launcher.pid") == 0) { 980 // launcher.pid property is private and is processed 981 // in process_sun_java_launcher_properties(); 982 // the sun.java.launcher property is passed on to the java application 983 FreeHeap(key); 984 if (eq != NULL) { 985 FreeHeap(value); 986 } 987 return true; 988 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 989 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 990 // its value without going through the property list or making a Java call. 991 _java_vendor_url_bug = value; 992 } else if (strcmp(key, "sun.boot.library.path") == 0) { 993 PropertyList_unique_add(&_system_properties, key, value, true); 994 return true; 995 } 996 // Create new property and add at the end of the list 997 PropertyList_unique_add(&_system_properties, key, value); 998 return true; 999} 1000 1001//=========================================================================================================== 1002// Setting int/mixed/comp mode flags 1003 1004void Arguments::set_mode_flags(Mode mode) { 1005 // Set up default values for all flags. 1006 // If you add a flag to any of the branches below, 1007 // add a default value for it here. 1008 set_java_compiler(false); 1009 _mode = mode; 1010 1011 // Ensure Agent_OnLoad has the correct initial values. 1012 // This may not be the final mode; mode may change later in onload phase. 1013 PropertyList_unique_add(&_system_properties, "java.vm.info", 1014 (char*)VM_Version::vm_info_string(), false); 1015 1016 UseInterpreter = true; 1017 UseCompiler = true; 1018 UseLoopCounter = true; 1019 1020#ifndef ZERO 1021 // Turn these off for mixed and comp. Leave them on for Zero. 1022 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) { 1023 UseFastAccessorMethods = (mode == _int); 1024 } 1025 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) { 1026 UseFastEmptyMethods = (mode == _int); 1027 } 1028#endif 1029 1030 // Default values may be platform/compiler dependent - 1031 // use the saved values 1032 ClipInlining = Arguments::_ClipInlining; 1033 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1034 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1035 BackgroundCompilation = Arguments::_BackgroundCompilation; 1036 1037 // Change from defaults based on mode 1038 switch (mode) { 1039 default: 1040 ShouldNotReachHere(); 1041 break; 1042 case _int: 1043 UseCompiler = false; 1044 UseLoopCounter = false; 1045 AlwaysCompileLoopMethods = false; 1046 UseOnStackReplacement = false; 1047 break; 1048 case _mixed: 1049 // same as default 1050 break; 1051 case _comp: 1052 UseInterpreter = false; 1053 BackgroundCompilation = false; 1054 ClipInlining = false; 1055 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1056 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1057 // compile a level 4 (C2) and then continue executing it. 1058 if (TieredCompilation) { 1059 Tier3InvokeNotifyFreqLog = 0; 1060 Tier4InvocationThreshold = 0; 1061 } 1062 break; 1063 } 1064} 1065 1066// Conflict: required to use shared spaces (-Xshare:on), but 1067// incompatible command line options were chosen. 1068 1069static void no_shared_spaces() { 1070 if (RequireSharedSpaces) { 1071 jio_fprintf(defaultStream::error_stream(), 1072 "Class data sharing is inconsistent with other specified options.\n"); 1073 vm_exit_during_initialization("Unable to use shared archive.", NULL); 1074 } else { 1075 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1076 } 1077} 1078 1079void Arguments::set_tiered_flags() { 1080 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1081 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1082 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1083 } 1084 if (CompilationPolicyChoice < 2) { 1085 vm_exit_during_initialization( 1086 "Incompatible compilation policy selected", NULL); 1087 } 1088 // Increase the code cache size - tiered compiles a lot more. 1089 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1090 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5); 1091 } 1092 if (!UseInterpreter) { // -Xcomp 1093 Tier3InvokeNotifyFreqLog = 0; 1094 Tier4InvocationThreshold = 0; 1095 } 1096} 1097 1098#if INCLUDE_ALL_GCS 1099static void disable_adaptive_size_policy(const char* collector_name) { 1100 if (UseAdaptiveSizePolicy) { 1101 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1102 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1103 collector_name); 1104 } 1105 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1106 } 1107} 1108 1109void Arguments::set_parnew_gc_flags() { 1110 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1111 "control point invariant"); 1112 assert(UseParNewGC, "Error"); 1113 1114 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1115 disable_adaptive_size_policy("UseParNewGC"); 1116 1117 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1118 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1119 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1120 } else if (ParallelGCThreads == 0) { 1121 jio_fprintf(defaultStream::error_stream(), 1122 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1123 vm_exit(1); 1124 } 1125 1126 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1127 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1128 // we set them to 1024 and 1024. 1129 // See CR 6362902. 1130 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1131 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1132 } 1133 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1134 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1135 } 1136 1137 // AlwaysTenure flag should make ParNew promote all at first collection. 1138 // See CR 6362902. 1139 if (AlwaysTenure) { 1140 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 1141 } 1142 // When using compressed oops, we use local overflow stacks, 1143 // rather than using a global overflow list chained through 1144 // the klass word of the object's pre-image. 1145 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1146 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1147 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1148 } 1149 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1150 } 1151 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1152} 1153 1154// Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1155// sparc/solaris for certain applications, but would gain from 1156// further optimization and tuning efforts, and would almost 1157// certainly gain from analysis of platform and environment. 1158void Arguments::set_cms_and_parnew_gc_flags() { 1159 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1160 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1161 1162 // If we are using CMS, we prefer to UseParNewGC, 1163 // unless explicitly forbidden. 1164 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1165 FLAG_SET_ERGO(bool, UseParNewGC, true); 1166 } 1167 1168 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1169 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1170 1171 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1172 // as needed. 1173 if (UseParNewGC) { 1174 set_parnew_gc_flags(); 1175 } 1176 1177 size_t max_heap = align_size_down(MaxHeapSize, 1178 CardTableRS::ct_max_alignment_constraint()); 1179 1180 // Now make adjustments for CMS 1181 intx tenuring_default = (intx)6; 1182 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1183 1184 // Preferred young gen size for "short" pauses: 1185 // upper bound depends on # of threads and NewRatio. 1186 const uintx parallel_gc_threads = 1187 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1188 const size_t preferred_max_new_size_unaligned = 1189 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1190 size_t preferred_max_new_size = 1191 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1192 1193 // Unless explicitly requested otherwise, size young gen 1194 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1195 1196 // If either MaxNewSize or NewRatio is set on the command line, 1197 // assume the user is trying to set the size of the young gen. 1198 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1199 1200 // Set MaxNewSize to our calculated preferred_max_new_size unless 1201 // NewSize was set on the command line and it is larger than 1202 // preferred_max_new_size. 1203 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1204 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1205 } else { 1206 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1207 } 1208 if (PrintGCDetails && Verbose) { 1209 // Too early to use gclog_or_tty 1210 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1211 } 1212 1213 // Code along this path potentially sets NewSize and OldSize 1214 if (PrintGCDetails && Verbose) { 1215 // Too early to use gclog_or_tty 1216 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1217 " initial_heap_size: " SIZE_FORMAT 1218 " max_heap: " SIZE_FORMAT, 1219 min_heap_size(), InitialHeapSize, max_heap); 1220 } 1221 size_t min_new = preferred_max_new_size; 1222 if (FLAG_IS_CMDLINE(NewSize)) { 1223 min_new = NewSize; 1224 } 1225 if (max_heap > min_new && min_heap_size() > min_new) { 1226 // Unless explicitly requested otherwise, make young gen 1227 // at least min_new, and at most preferred_max_new_size. 1228 if (FLAG_IS_DEFAULT(NewSize)) { 1229 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1230 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1231 if (PrintGCDetails && Verbose) { 1232 // Too early to use gclog_or_tty 1233 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1234 } 1235 } 1236 // Unless explicitly requested otherwise, size old gen 1237 // so it's NewRatio x of NewSize. 1238 if (FLAG_IS_DEFAULT(OldSize)) { 1239 if (max_heap > NewSize) { 1240 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1241 if (PrintGCDetails && Verbose) { 1242 // Too early to use gclog_or_tty 1243 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1244 } 1245 } 1246 } 1247 } 1248 } 1249 // Unless explicitly requested otherwise, definitely 1250 // promote all objects surviving "tenuring_default" scavenges. 1251 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1252 FLAG_IS_DEFAULT(SurvivorRatio)) { 1253 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1254 } 1255 // If we decided above (or user explicitly requested) 1256 // `promote all' (via MaxTenuringThreshold := 0), 1257 // prefer minuscule survivor spaces so as not to waste 1258 // space for (non-existent) survivors 1259 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1260 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1261 } 1262 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1263 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1264 // This is done in order to make ParNew+CMS configuration to work 1265 // with YoungPLABSize and OldPLABSize options. 1266 // See CR 6362902. 1267 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1268 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1269 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1270 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1271 // the value (either from the command line or ergonomics) of 1272 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1273 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1274 } else { 1275 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1276 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1277 // we'll let it to take precedence. 1278 jio_fprintf(defaultStream::error_stream(), 1279 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1280 " options are specified for the CMS collector." 1281 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1282 } 1283 } 1284 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1285 // OldPLAB sizing manually turned off: Use a larger default setting, 1286 // unless it was manually specified. This is because a too-low value 1287 // will slow down scavenges. 1288 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1289 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1290 } 1291 } 1292 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1293 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1294 // If either of the static initialization defaults have changed, note this 1295 // modification. 1296 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1297 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1298 } 1299 if (PrintGCDetails && Verbose) { 1300 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1301 MarkStackSize / K, MarkStackSizeMax / K); 1302 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1303 } 1304} 1305#endif // INCLUDE_ALL_GCS 1306 1307void set_object_alignment() { 1308 // Object alignment. 1309 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1310 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1311 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1312 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1313 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1314 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1315 1316 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1317 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1318 1319 // Oop encoding heap max 1320 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1321 1322#if INCLUDE_ALL_GCS 1323 // Set CMS global values 1324 CompactibleFreeListSpace::set_cms_values(); 1325#endif // INCLUDE_ALL_GCS 1326} 1327 1328bool verify_object_alignment() { 1329 // Object alignment. 1330 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1331 jio_fprintf(defaultStream::error_stream(), 1332 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1333 (int)ObjectAlignmentInBytes); 1334 return false; 1335 } 1336 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1337 jio_fprintf(defaultStream::error_stream(), 1338 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1339 (int)ObjectAlignmentInBytes, BytesPerLong); 1340 return false; 1341 } 1342 // It does not make sense to have big object alignment 1343 // since a space lost due to alignment will be greater 1344 // then a saved space from compressed oops. 1345 if ((int)ObjectAlignmentInBytes > 256) { 1346 jio_fprintf(defaultStream::error_stream(), 1347 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1348 (int)ObjectAlignmentInBytes); 1349 return false; 1350 } 1351 // In case page size is very small. 1352 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1353 jio_fprintf(defaultStream::error_stream(), 1354 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1355 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1356 return false; 1357 } 1358 return true; 1359} 1360 1361inline uintx max_heap_for_compressed_oops() { 1362 // Avoid sign flip. 1363 if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) { 1364 return 0; 1365 } 1366 LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size()); 1367 NOT_LP64(ShouldNotReachHere(); return 0); 1368} 1369 1370bool Arguments::should_auto_select_low_pause_collector() { 1371 if (UseAutoGCSelectPolicy && 1372 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1373 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1374 if (PrintGCDetails) { 1375 // Cannot use gclog_or_tty yet. 1376 tty->print_cr("Automatic selection of the low pause collector" 1377 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1378 } 1379 return true; 1380 } 1381 return false; 1382} 1383 1384void Arguments::set_use_compressed_oops() { 1385#ifndef ZERO 1386#ifdef _LP64 1387 // MaxHeapSize is not set up properly at this point, but 1388 // the only value that can override MaxHeapSize if we are 1389 // to use UseCompressedOops is InitialHeapSize. 1390 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1391 1392 if (max_heap_size <= max_heap_for_compressed_oops()) { 1393#if !defined(COMPILER1) || defined(TIERED) 1394 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1395 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1396 } 1397#endif 1398#ifdef _WIN64 1399 if (UseLargePages && UseCompressedOops) { 1400 // Cannot allocate guard pages for implicit checks in indexed addressing 1401 // mode, when large pages are specified on windows. 1402 // This flag could be switched ON if narrow oop base address is set to 0, 1403 // see code in Universe::initialize_heap(). 1404 Universe::set_narrow_oop_use_implicit_null_checks(false); 1405 } 1406#endif // _WIN64 1407 } else { 1408 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1409 warning("Max heap size too large for Compressed Oops"); 1410 FLAG_SET_DEFAULT(UseCompressedOops, false); 1411 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1412 } 1413 } 1414#endif // _LP64 1415#endif // ZERO 1416} 1417 1418void Arguments::set_ergonomics_flags() { 1419 1420 if (os::is_server_class_machine()) { 1421 // If no other collector is requested explicitly, 1422 // let the VM select the collector based on 1423 // machine class and automatic selection policy. 1424 if (!UseSerialGC && 1425 !UseConcMarkSweepGC && 1426 !UseG1GC && 1427 !UseParNewGC && 1428 FLAG_IS_DEFAULT(UseParallelGC)) { 1429 if (should_auto_select_low_pause_collector()) { 1430 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1431 } else { 1432 FLAG_SET_ERGO(bool, UseParallelGC, true); 1433 } 1434 } 1435 // Shared spaces work fine with other GCs but causes bytecode rewriting 1436 // to be disabled, which hurts interpreter performance and decreases 1437 // server performance. On server class machines, keep the default 1438 // off unless it is asked for. Future work: either add bytecode rewriting 1439 // at link time, or rewrite bytecodes in non-shared methods. 1440 if (!DumpSharedSpaces && !RequireSharedSpaces) { 1441 no_shared_spaces(); 1442 } 1443 } 1444 1445#ifndef ZERO 1446#ifdef _LP64 1447 set_use_compressed_oops(); 1448 // UseCompressedOops must be on for UseCompressedKlassPointers to be on. 1449 if (!UseCompressedOops) { 1450 if (UseCompressedKlassPointers) { 1451 warning("UseCompressedKlassPointers requires UseCompressedOops"); 1452 } 1453 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1454 } else { 1455 // Turn on UseCompressedKlassPointers too 1456 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) { 1457 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true); 1458 } 1459 // Set the ClassMetaspaceSize to something that will not need to be 1460 // expanded, since it cannot be expanded. 1461 if (UseCompressedKlassPointers) { 1462 if (ClassMetaspaceSize > KlassEncodingMetaspaceMax) { 1463 warning("Class metaspace size is too large for UseCompressedKlassPointers"); 1464 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1465 } else if (FLAG_IS_DEFAULT(ClassMetaspaceSize)) { 1466 // 100,000 classes seems like a good size, so 100M assumes around 1K 1467 // per klass. The vtable and oopMap is embedded so we don't have a fixed 1468 // size per klass. Eventually, this will be parameterized because it 1469 // would also be useful to determine the optimal size of the 1470 // systemDictionary. 1471 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M); 1472 } 1473 } 1474 } 1475 // Also checks that certain machines are slower with compressed oops 1476 // in vm_version initialization code. 1477#endif // _LP64 1478#endif // !ZERO 1479} 1480 1481void Arguments::set_parallel_gc_flags() { 1482 assert(UseParallelGC || UseParallelOldGC, "Error"); 1483 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1484 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1485 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1486 } 1487 FLAG_SET_DEFAULT(UseParallelGC, true); 1488 1489 // If no heap maximum was requested explicitly, use some reasonable fraction 1490 // of the physical memory, up to a maximum of 1GB. 1491 FLAG_SET_DEFAULT(ParallelGCThreads, 1492 Abstract_VM_Version::parallel_worker_threads()); 1493 if (ParallelGCThreads == 0) { 1494 jio_fprintf(defaultStream::error_stream(), 1495 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1496 vm_exit(1); 1497 } 1498 1499 1500 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1501 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1502 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1503 // See CR 6362902 for details. 1504 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1505 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1506 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1507 } 1508 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1509 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1510 } 1511 } 1512 1513 if (UseParallelOldGC) { 1514 // Par compact uses lower default values since they are treated as 1515 // minimums. These are different defaults because of the different 1516 // interpretation and are not ergonomically set. 1517 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1518 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1519 } 1520 } 1521} 1522 1523void Arguments::set_g1_gc_flags() { 1524 assert(UseG1GC, "Error"); 1525#ifdef COMPILER1 1526 FastTLABRefill = false; 1527#endif 1528 FLAG_SET_DEFAULT(ParallelGCThreads, 1529 Abstract_VM_Version::parallel_worker_threads()); 1530 if (ParallelGCThreads == 0) { 1531 FLAG_SET_DEFAULT(ParallelGCThreads, 1532 Abstract_VM_Version::parallel_worker_threads()); 1533 } 1534 1535 // MarkStackSize will be set (if it hasn't been set by the user) 1536 // when concurrent marking is initialized. 1537 // Its value will be based upon the number of parallel marking threads. 1538 // But we do set the maximum mark stack size here. 1539 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1540 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1541 } 1542 1543 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1544 // In G1, we want the default GC overhead goal to be higher than 1545 // say in PS. So we set it here to 10%. Otherwise the heap might 1546 // be expanded more aggressively than we would like it to. In 1547 // fact, even 10% seems to not be high enough in some cases 1548 // (especially small GC stress tests that the main thing they do 1549 // is allocation). We might consider increase it further. 1550 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1551 } 1552 1553 if (PrintGCDetails && Verbose) { 1554 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1555 MarkStackSize / K, MarkStackSizeMax / K); 1556 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1557 } 1558} 1559 1560julong Arguments::limit_by_allocatable_memory(julong limit) { 1561 julong max_allocatable; 1562 julong result = limit; 1563 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1564 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1565 } 1566 return result; 1567} 1568 1569void Arguments::set_heap_size() { 1570 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1571 // Deprecated flag 1572 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1573 } 1574 1575 const julong phys_mem = 1576 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1577 : (julong)MaxRAM; 1578 1579 // If the maximum heap size has not been set with -Xmx, 1580 // then set it as fraction of the size of physical memory, 1581 // respecting the maximum and minimum sizes of the heap. 1582 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1583 julong reasonable_max = phys_mem / MaxRAMFraction; 1584 1585 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1586 // Small physical memory, so use a minimum fraction of it for the heap 1587 reasonable_max = phys_mem / MinRAMFraction; 1588 } else { 1589 // Not-small physical memory, so require a heap at least 1590 // as large as MaxHeapSize 1591 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1592 } 1593 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1594 // Limit the heap size to ErgoHeapSizeLimit 1595 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1596 } 1597 if (UseCompressedOops) { 1598 // Limit the heap size to the maximum possible when using compressed oops 1599 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1600 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1601 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1602 // but it should be not less than default MaxHeapSize. 1603 max_coop_heap -= HeapBaseMinAddress; 1604 } 1605 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1606 } 1607 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1608 1609 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1610 // An initial heap size was specified on the command line, 1611 // so be sure that the maximum size is consistent. Done 1612 // after call to limit_by_allocatable_memory because that 1613 // method might reduce the allocation size. 1614 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1615 } 1616 1617 if (PrintGCDetails && Verbose) { 1618 // Cannot use gclog_or_tty yet. 1619 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1620 } 1621 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1622 } 1623 1624 // If the minimum or initial heap_size have not been set or requested to be set 1625 // ergonomically, set them accordingly. 1626 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1627 julong reasonable_minimum = (julong)(OldSize + NewSize); 1628 1629 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1630 1631 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1632 1633 if (InitialHeapSize == 0) { 1634 julong reasonable_initial = phys_mem / InitialRAMFraction; 1635 1636 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1637 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1638 1639 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1640 1641 if (PrintGCDetails && Verbose) { 1642 // Cannot use gclog_or_tty yet. 1643 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1644 } 1645 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1646 } 1647 // If the minimum heap size has not been set (via -Xms), 1648 // synchronize with InitialHeapSize to avoid errors with the default value. 1649 if (min_heap_size() == 0) { 1650 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1651 if (PrintGCDetails && Verbose) { 1652 // Cannot use gclog_or_tty yet. 1653 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1654 } 1655 } 1656 } 1657} 1658 1659// This must be called after ergonomics because we want bytecode rewriting 1660// if the server compiler is used, or if UseSharedSpaces is disabled. 1661void Arguments::set_bytecode_flags() { 1662 // Better not attempt to store into a read-only space. 1663 if (UseSharedSpaces) { 1664 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1665 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1666 } 1667 1668 if (!RewriteBytecodes) { 1669 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1670 } 1671} 1672 1673// Aggressive optimization flags -XX:+AggressiveOpts 1674void Arguments::set_aggressive_opts_flags() { 1675#ifdef COMPILER2 1676 if (AggressiveUnboxing) { 1677 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1678 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1679 } else if (!EliminateAutoBox) { 1680 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1681 AggressiveUnboxing = false; 1682 } 1683 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1684 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1685 } else if (!DoEscapeAnalysis) { 1686 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1687 AggressiveUnboxing = false; 1688 } 1689 } 1690 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1691 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1692 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1693 } 1694 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1695 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1696 } 1697 1698 // Feed the cache size setting into the JDK 1699 char buffer[1024]; 1700 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1701 add_property(buffer); 1702 } 1703 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1704 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1705 } 1706#endif 1707 1708 if (AggressiveOpts) { 1709// Sample flag setting code 1710// if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1711// FLAG_SET_DEFAULT(EliminateZeroing, true); 1712// } 1713 } 1714} 1715 1716//=========================================================================================================== 1717// Parsing of java.compiler property 1718 1719void Arguments::process_java_compiler_argument(char* arg) { 1720 // For backwards compatibility, Djava.compiler=NONE or "" 1721 // causes us to switch to -Xint mode UNLESS -Xdebug 1722 // is also specified. 1723 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1724 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1725 } 1726} 1727 1728void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1729 _sun_java_launcher = strdup(launcher); 1730 if (strcmp("gamma", _sun_java_launcher) == 0) { 1731 _created_by_gamma_launcher = true; 1732 } 1733} 1734 1735bool Arguments::created_by_java_launcher() { 1736 assert(_sun_java_launcher != NULL, "property must have value"); 1737 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1738} 1739 1740bool Arguments::created_by_gamma_launcher() { 1741 return _created_by_gamma_launcher; 1742} 1743 1744//=========================================================================================================== 1745// Parsing of main arguments 1746 1747bool Arguments::verify_interval(uintx val, uintx min, 1748 uintx max, const char* name) { 1749 // Returns true iff value is in the inclusive interval [min..max] 1750 // false, otherwise. 1751 if (val >= min && val <= max) { 1752 return true; 1753 } 1754 jio_fprintf(defaultStream::error_stream(), 1755 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1756 " and " UINTX_FORMAT "\n", 1757 name, val, min, max); 1758 return false; 1759} 1760 1761bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1762 // Returns true if given value is at least specified min threshold 1763 // false, otherwise. 1764 if (val >= min ) { 1765 return true; 1766 } 1767 jio_fprintf(defaultStream::error_stream(), 1768 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1769 name, val, min); 1770 return false; 1771} 1772 1773bool Arguments::verify_percentage(uintx value, const char* name) { 1774 if (value <= 100) { 1775 return true; 1776 } 1777 jio_fprintf(defaultStream::error_stream(), 1778 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1779 name, value); 1780 return false; 1781} 1782 1783#if !INCLUDE_ALL_GCS 1784#ifdef ASSERT 1785static bool verify_serial_gc_flags() { 1786 return (UseSerialGC && 1787 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1788 UseParallelGC || UseParallelOldGC)); 1789} 1790#endif // ASSERT 1791#endif // INCLUDE_ALL_GCS 1792 1793// check if do gclog rotation 1794// +UseGCLogFileRotation is a must, 1795// no gc log rotation when log file not supplied or 1796// NumberOfGCLogFiles is 0, or GCLogFileSize is 0 1797void check_gclog_consistency() { 1798 if (UseGCLogFileRotation) { 1799 if ((Arguments::gc_log_filename() == NULL) || 1800 (NumberOfGCLogFiles == 0) || 1801 (GCLogFileSize == 0)) { 1802 jio_fprintf(defaultStream::output_stream(), 1803 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n" 1804 "where num_of_file > 0 and num_of_size > 0\n" 1805 "GC log rotation is turned off\n"); 1806 UseGCLogFileRotation = false; 1807 } 1808 } 1809 1810 if (UseGCLogFileRotation && GCLogFileSize < 8*K) { 1811 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1812 jio_fprintf(defaultStream::output_stream(), 1813 "GCLogFileSize changed to minimum 8K\n"); 1814 } 1815} 1816 1817// Check consistency of GC selection 1818bool Arguments::check_gc_consistency() { 1819 check_gclog_consistency(); 1820 bool status = true; 1821 // Ensure that the user has not selected conflicting sets 1822 // of collectors. [Note: this check is merely a user convenience; 1823 // collectors over-ride each other so that only a non-conflicting 1824 // set is selected; however what the user gets is not what they 1825 // may have expected from the combination they asked for. It's 1826 // better to reduce user confusion by not allowing them to 1827 // select conflicting combinations. 1828 uint i = 0; 1829 if (UseSerialGC) i++; 1830 if (UseConcMarkSweepGC || UseParNewGC) i++; 1831 if (UseParallelGC || UseParallelOldGC) i++; 1832 if (UseG1GC) i++; 1833 if (i > 1) { 1834 jio_fprintf(defaultStream::error_stream(), 1835 "Conflicting collector combinations in option list; " 1836 "please refer to the release notes for the combinations " 1837 "allowed\n"); 1838 status = false; 1839 } 1840 1841 return status; 1842} 1843 1844void Arguments::check_deprecated_gcs() { 1845 if (UseConcMarkSweepGC && !UseParNewGC) { 1846 warning("Using the DefNew young collector with the CMS collector is deprecated " 1847 "and will likely be removed in a future release"); 1848 } 1849 1850 if (UseParNewGC && !UseConcMarkSweepGC) { 1851 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 1852 // set up UseSerialGC properly, so that can't be used in the check here. 1853 warning("Using the ParNew young collector with the Serial old collector is deprecated " 1854 "and will likely be removed in a future release"); 1855 } 1856 1857 if (CMSIncrementalMode) { 1858 warning("Using incremental CMS is deprecated and will likely be removed in a future release"); 1859 } 1860} 1861 1862void Arguments::check_deprecated_gc_flags() { 1863 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 1864 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 1865 "and will likely be removed in future release"); 1866 } 1867} 1868 1869// Check stack pages settings 1870bool Arguments::check_stack_pages() 1871{ 1872 bool status = true; 1873 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 1874 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 1875 // greater stack shadow pages can't generate instruction to bang stack 1876 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 1877 return status; 1878} 1879 1880// Check the consistency of vm_init_args 1881bool Arguments::check_vm_args_consistency() { 1882 // Method for adding checks for flag consistency. 1883 // The intent is to warn the user of all possible conflicts, 1884 // before returning an error. 1885 // Note: Needs platform-dependent factoring. 1886 bool status = true; 1887 1888#if ( (defined(COMPILER2) && defined(SPARC))) 1889 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init 1890 // on sparc doesn't require generation of a stub as is the case on, e.g., 1891 // x86. Normally, VM_Version_init must be called from init_globals in 1892 // init.cpp, which is called by the initial java thread *after* arguments 1893 // have been parsed. VM_Version_init gets called twice on sparc. 1894 extern void VM_Version_init(); 1895 VM_Version_init(); 1896 if (!VM_Version::has_v9()) { 1897 jio_fprintf(defaultStream::error_stream(), 1898 "V8 Machine detected, Server requires V9\n"); 1899 status = false; 1900 } 1901#endif /* COMPILER2 && SPARC */ 1902 1903 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 1904 // builds so the cost of stack banging can be measured. 1905#if (defined(PRODUCT) && defined(SOLARIS)) 1906 if (!UseBoundThreads && !UseStackBanging) { 1907 jio_fprintf(defaultStream::error_stream(), 1908 "-UseStackBanging conflicts with -UseBoundThreads\n"); 1909 1910 status = false; 1911 } 1912#endif 1913 1914 if (TLABRefillWasteFraction == 0) { 1915 jio_fprintf(defaultStream::error_stream(), 1916 "TLABRefillWasteFraction should be a denominator, " 1917 "not " SIZE_FORMAT "\n", 1918 TLABRefillWasteFraction); 1919 status = false; 1920 } 1921 1922 status = status && verify_percentage(AdaptiveSizePolicyWeight, 1923 "AdaptiveSizePolicyWeight"); 1924 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 1925 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 1926 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 1927 1928 // Divide by bucket size to prevent a large size from causing rollover when 1929 // calculating amount of memory needed to be allocated for the String table. 1930 status = status && verify_interval(StringTableSize, minimumStringTableSize, 1931 (max_uintx / StringTable::bucket_size()), "StringTable size"); 1932 1933 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 1934 jio_fprintf(defaultStream::error_stream(), 1935 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1936 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 1937 MinHeapFreeRatio, MaxHeapFreeRatio); 1938 status = false; 1939 } 1940 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1941 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 1942 1943 // Min/MaxMetaspaceFreeRatio 1944 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 1945 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 1946 1947 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 1948 jio_fprintf(defaultStream::error_stream(), 1949 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 1950 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 1951 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 1952 MinMetaspaceFreeRatio, 1953 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 1954 MaxMetaspaceFreeRatio); 1955 status = false; 1956 } 1957 1958 // Trying to keep 100% free is not practical 1959 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 1960 1961 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 1962 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 1963 } 1964 1965 if (UseParallelOldGC && ParallelOldGCSplitALot) { 1966 // Settings to encourage splitting. 1967 if (!FLAG_IS_CMDLINE(NewRatio)) { 1968 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 1969 } 1970 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 1971 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 1972 } 1973 } 1974 1975 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1976 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 1977 if (GCTimeLimit == 100) { 1978 // Turn off gc-overhead-limit-exceeded checks 1979 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 1980 } 1981 1982 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1983 1984 status = status && check_gc_consistency(); 1985 status = status && check_stack_pages(); 1986 1987 if (_has_alloc_profile) { 1988 if (UseParallelGC || UseParallelOldGC) { 1989 jio_fprintf(defaultStream::error_stream(), 1990 "error: invalid argument combination.\n" 1991 "Allocation profiling (-Xaprof) cannot be used together with " 1992 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n"); 1993 status = false; 1994 } 1995 if (UseConcMarkSweepGC) { 1996 jio_fprintf(defaultStream::error_stream(), 1997 "error: invalid argument combination.\n" 1998 "Allocation profiling (-Xaprof) cannot be used together with " 1999 "the CMS collector (-XX:+UseConcMarkSweepGC).\n"); 2000 status = false; 2001 } 2002 } 2003 2004 if (CMSIncrementalMode) { 2005 if (!UseConcMarkSweepGC) { 2006 jio_fprintf(defaultStream::error_stream(), 2007 "error: invalid argument combination.\n" 2008 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 2009 "selected in order\nto use CMSIncrementalMode.\n"); 2010 status = false; 2011 } else { 2012 status = status && verify_percentage(CMSIncrementalDutyCycle, 2013 "CMSIncrementalDutyCycle"); 2014 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 2015 "CMSIncrementalDutyCycleMin"); 2016 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2017 "CMSIncrementalSafetyFactor"); 2018 status = status && verify_percentage(CMSIncrementalOffset, 2019 "CMSIncrementalOffset"); 2020 status = status && verify_percentage(CMSExpAvgFactor, 2021 "CMSExpAvgFactor"); 2022 // If it was not set on the command line, set 2023 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 2024 if (CMSInitiatingOccupancyFraction < 0) { 2025 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 2026 } 2027 } 2028 } 2029 2030 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2031 // insists that we hold the requisite locks so that the iteration is 2032 // MT-safe. For the verification at start-up and shut-down, we don't 2033 // yet have a good way of acquiring and releasing these locks, 2034 // which are not visible at the CollectedHeap level. We want to 2035 // be able to acquire these locks and then do the iteration rather 2036 // than just disable the lock verification. This will be fixed under 2037 // bug 4788986. 2038 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2039 if (VerifyDuringStartup) { 2040 warning("Heap verification at start-up disabled " 2041 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2042 VerifyDuringStartup = false; // Disable verification at start-up 2043 } 2044 2045 if (VerifyBeforeExit) { 2046 warning("Heap verification at shutdown disabled " 2047 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2048 VerifyBeforeExit = false; // Disable verification at shutdown 2049 } 2050 } 2051 2052 // Note: only executed in non-PRODUCT mode 2053 if (!UseAsyncConcMarkSweepGC && 2054 (ExplicitGCInvokesConcurrent || 2055 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2056 jio_fprintf(defaultStream::error_stream(), 2057 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2058 " with -UseAsyncConcMarkSweepGC"); 2059 status = false; 2060 } 2061 2062 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2063 2064#if INCLUDE_ALL_GCS 2065 if (UseG1GC) { 2066 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2067 "InitiatingHeapOccupancyPercent"); 2068 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2069 "G1RefProcDrainInterval"); 2070 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2071 "G1ConcMarkStepDurationMillis"); 2072 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2073 "G1ConcRSHotCardLimit"); 2074 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2075 "G1ConcRSLogCacheSize"); 2076 } 2077#endif // INCLUDE_ALL_GCS 2078 2079 status = status && verify_interval(RefDiscoveryPolicy, 2080 ReferenceProcessor::DiscoveryPolicyMin, 2081 ReferenceProcessor::DiscoveryPolicyMax, 2082 "RefDiscoveryPolicy"); 2083 2084 // Limit the lower bound of this flag to 1 as it is used in a division 2085 // expression. 2086 status = status && verify_interval(TLABWasteTargetPercent, 2087 1, 100, "TLABWasteTargetPercent"); 2088 2089 status = status && verify_object_alignment(); 2090 2091 status = status && verify_min_value(ClassMetaspaceSize, 1*M, 2092 "ClassMetaspaceSize"); 2093 2094 status = status && verify_interval(MarkStackSizeMax, 2095 1, (max_jint - 1), "MarkStackSizeMax"); 2096 2097#ifdef SPARC 2098 if (UseConcMarkSweepGC || UseG1GC) { 2099 // Issue a stern warning if the user has explicitly set 2100 // UseMemSetInBOT (it is known to cause issues), but allow 2101 // use for experimentation and debugging. 2102 if (VM_Version::is_sun4v() && UseMemSetInBOT) { 2103 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error"); 2104 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability" 2105 " on sun4v; please understand that you are using at your own risk!"); 2106 } 2107 } 2108#endif // SPARC 2109 2110 if (PrintNMTStatistics) { 2111#if INCLUDE_NMT 2112 if (MemTracker::tracking_level() == MemTracker::NMT_off) { 2113#endif // INCLUDE_NMT 2114 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2115 PrintNMTStatistics = false; 2116#if INCLUDE_NMT 2117 } 2118#endif 2119 } 2120 2121 return status; 2122} 2123 2124bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2125 const char* option_type) { 2126 if (ignore) return false; 2127 2128 const char* spacer = " "; 2129 if (option_type == NULL) { 2130 option_type = ++spacer; // Set both to the empty string. 2131 } 2132 2133 if (os::obsolete_option(option)) { 2134 jio_fprintf(defaultStream::error_stream(), 2135 "Obsolete %s%soption: %s\n", option_type, spacer, 2136 option->optionString); 2137 return false; 2138 } else { 2139 jio_fprintf(defaultStream::error_stream(), 2140 "Unrecognized %s%soption: %s\n", option_type, spacer, 2141 option->optionString); 2142 return true; 2143 } 2144} 2145 2146static const char* user_assertion_options[] = { 2147 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2148}; 2149 2150static const char* system_assertion_options[] = { 2151 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2152}; 2153 2154// Return true if any of the strings in null-terminated array 'names' matches. 2155// If tail_allowed is true, then the tail must begin with a colon; otherwise, 2156// the option must match exactly. 2157static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2158 bool tail_allowed) { 2159 for (/* empty */; *names != NULL; ++names) { 2160 if (match_option(option, *names, tail)) { 2161 if (**tail == '\0' || tail_allowed && **tail == ':') { 2162 return true; 2163 } 2164 } 2165 } 2166 return false; 2167} 2168 2169bool Arguments::parse_uintx(const char* value, 2170 uintx* uintx_arg, 2171 uintx min_size) { 2172 2173 // Check the sign first since atomull() parses only unsigned values. 2174 bool value_is_positive = !(*value == '-'); 2175 2176 if (value_is_positive) { 2177 julong n; 2178 bool good_return = atomull(value, &n); 2179 if (good_return) { 2180 bool above_minimum = n >= min_size; 2181 bool value_is_too_large = n > max_uintx; 2182 2183 if (above_minimum && !value_is_too_large) { 2184 *uintx_arg = n; 2185 return true; 2186 } 2187 } 2188 } 2189 return false; 2190} 2191 2192Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2193 julong* long_arg, 2194 julong min_size) { 2195 if (!atomull(s, long_arg)) return arg_unreadable; 2196 return check_memory_size(*long_arg, min_size); 2197} 2198 2199// Parse JavaVMInitArgs structure 2200 2201jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2202 // For components of the system classpath. 2203 SysClassPath scp(Arguments::get_sysclasspath()); 2204 bool scp_assembly_required = false; 2205 2206 // Save default settings for some mode flags 2207 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2208 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2209 Arguments::_ClipInlining = ClipInlining; 2210 Arguments::_BackgroundCompilation = BackgroundCompilation; 2211 2212 // Setup flags for mixed which is the default 2213 set_mode_flags(_mixed); 2214 2215 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2216 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2217 if (result != JNI_OK) { 2218 return result; 2219 } 2220 2221 // Parse JavaVMInitArgs structure passed in 2222 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE); 2223 if (result != JNI_OK) { 2224 return result; 2225 } 2226 2227 if (AggressiveOpts) { 2228 // Insert alt-rt.jar between user-specified bootclasspath 2229 // prefix and the default bootclasspath. os::set_boot_path() 2230 // uses meta_index_dir as the default bootclasspath directory. 2231 const char* altclasses_jar = "alt-rt.jar"; 2232 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 + 2233 strlen(altclasses_jar); 2234 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal); 2235 strcpy(altclasses_path, get_meta_index_dir()); 2236 strcat(altclasses_path, altclasses_jar); 2237 scp.add_suffix_to_prefix(altclasses_path); 2238 scp_assembly_required = true; 2239 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal); 2240 } 2241 2242 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2243 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2244 if (result != JNI_OK) { 2245 return result; 2246 } 2247 2248 // Do final processing now that all arguments have been parsed 2249 result = finalize_vm_init_args(&scp, scp_assembly_required); 2250 if (result != JNI_OK) { 2251 return result; 2252 } 2253 2254 return JNI_OK; 2255} 2256 2257// Checks if name in command-line argument -agent{lib,path}:name[=options] 2258// represents a valid HPROF of JDWP agent. is_path==true denotes that we 2259// are dealing with -agentpath (case where name is a path), otherwise with 2260// -agentlib 2261bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2262 char *_name; 2263 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2264 size_t _len_hprof, _len_jdwp, _len_prefix; 2265 2266 if (is_path) { 2267 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2268 return false; 2269 } 2270 2271 _name++; // skip past last path separator 2272 _len_prefix = strlen(JNI_LIB_PREFIX); 2273 2274 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2275 return false; 2276 } 2277 2278 _name += _len_prefix; 2279 _len_hprof = strlen(_hprof); 2280 _len_jdwp = strlen(_jdwp); 2281 2282 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2283 _name += _len_hprof; 2284 } 2285 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2286 _name += _len_jdwp; 2287 } 2288 else { 2289 return false; 2290 } 2291 2292 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2293 return false; 2294 } 2295 2296 return true; 2297 } 2298 2299 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2300 return true; 2301 } 2302 2303 return false; 2304} 2305 2306jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2307 SysClassPath* scp_p, 2308 bool* scp_assembly_required_p, 2309 FlagValueOrigin origin) { 2310 // Remaining part of option string 2311 const char* tail; 2312 2313 // iterate over arguments 2314 for (int index = 0; index < args->nOptions; index++) { 2315 bool is_absolute_path = false; // for -agentpath vs -agentlib 2316 2317 const JavaVMOption* option = args->options + index; 2318 2319 if (!match_option(option, "-Djava.class.path", &tail) && 2320 !match_option(option, "-Dsun.java.command", &tail) && 2321 !match_option(option, "-Dsun.java.launcher", &tail)) { 2322 2323 // add all jvm options to the jvm_args string. This string 2324 // is used later to set the java.vm.args PerfData string constant. 2325 // the -Djava.class.path and the -Dsun.java.command options are 2326 // omitted from jvm_args string as each have their own PerfData 2327 // string constant object. 2328 build_jvm_args(option->optionString); 2329 } 2330 2331 // -verbose:[class/gc/jni] 2332 if (match_option(option, "-verbose", &tail)) { 2333 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2334 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2335 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2336 } else if (!strcmp(tail, ":gc")) { 2337 FLAG_SET_CMDLINE(bool, PrintGC, true); 2338 } else if (!strcmp(tail, ":jni")) { 2339 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2340 } 2341 // -da / -ea / -disableassertions / -enableassertions 2342 // These accept an optional class/package name separated by a colon, e.g., 2343 // -da:java.lang.Thread. 2344 } else if (match_option(option, user_assertion_options, &tail, true)) { 2345 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2346 if (*tail == '\0') { 2347 JavaAssertions::setUserClassDefault(enable); 2348 } else { 2349 assert(*tail == ':', "bogus match by match_option()"); 2350 JavaAssertions::addOption(tail + 1, enable); 2351 } 2352 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2353 } else if (match_option(option, system_assertion_options, &tail, false)) { 2354 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2355 JavaAssertions::setSystemClassDefault(enable); 2356 // -bootclasspath: 2357 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2358 scp_p->reset_path(tail); 2359 *scp_assembly_required_p = true; 2360 // -bootclasspath/a: 2361 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2362 scp_p->add_suffix(tail); 2363 *scp_assembly_required_p = true; 2364 // -bootclasspath/p: 2365 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2366 scp_p->add_prefix(tail); 2367 *scp_assembly_required_p = true; 2368 // -Xrun 2369 } else if (match_option(option, "-Xrun", &tail)) { 2370 if (tail != NULL) { 2371 const char* pos = strchr(tail, ':'); 2372 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2373 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2374 name[len] = '\0'; 2375 2376 char *options = NULL; 2377 if(pos != NULL) { 2378 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2379 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2380 } 2381#if !INCLUDE_JVMTI 2382 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2383 jio_fprintf(defaultStream::error_stream(), 2384 "Profiling and debugging agents are not supported in this VM\n"); 2385 return JNI_ERR; 2386 } 2387#endif // !INCLUDE_JVMTI 2388 add_init_library(name, options); 2389 } 2390 // -agentlib and -agentpath 2391 } else if (match_option(option, "-agentlib:", &tail) || 2392 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2393 if(tail != NULL) { 2394 const char* pos = strchr(tail, '='); 2395 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2396 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2397 name[len] = '\0'; 2398 2399 char *options = NULL; 2400 if(pos != NULL) { 2401 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2402 } 2403#if !INCLUDE_JVMTI 2404 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2405 jio_fprintf(defaultStream::error_stream(), 2406 "Profiling and debugging agents are not supported in this VM\n"); 2407 return JNI_ERR; 2408 } 2409#endif // !INCLUDE_JVMTI 2410 add_init_agent(name, options, is_absolute_path); 2411 } 2412 // -javaagent 2413 } else if (match_option(option, "-javaagent:", &tail)) { 2414#if !INCLUDE_JVMTI 2415 jio_fprintf(defaultStream::error_stream(), 2416 "Instrumentation agents are not supported in this VM\n"); 2417 return JNI_ERR; 2418#else 2419 if(tail != NULL) { 2420 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2421 add_init_agent("instrument", options, false); 2422 } 2423#endif // !INCLUDE_JVMTI 2424 // -Xnoclassgc 2425 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2426 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2427 // -Xincgc: i-CMS 2428 } else if (match_option(option, "-Xincgc", &tail)) { 2429 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2430 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2431 // -Xnoincgc: no i-CMS 2432 } else if (match_option(option, "-Xnoincgc", &tail)) { 2433 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2434 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2435 // -Xconcgc 2436 } else if (match_option(option, "-Xconcgc", &tail)) { 2437 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2438 // -Xnoconcgc 2439 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2440 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2441 // -Xbatch 2442 } else if (match_option(option, "-Xbatch", &tail)) { 2443 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2444 // -Xmn for compatibility with other JVM vendors 2445 } else if (match_option(option, "-Xmn", &tail)) { 2446 julong long_initial_eden_size = 0; 2447 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1); 2448 if (errcode != arg_in_range) { 2449 jio_fprintf(defaultStream::error_stream(), 2450 "Invalid initial eden size: %s\n", option->optionString); 2451 describe_range_error(errcode); 2452 return JNI_EINVAL; 2453 } 2454 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size); 2455 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size); 2456 // -Xms 2457 } else if (match_option(option, "-Xms", &tail)) { 2458 julong long_initial_heap_size = 0; 2459 // an initial heap size of 0 means automatically determine 2460 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2461 if (errcode != arg_in_range) { 2462 jio_fprintf(defaultStream::error_stream(), 2463 "Invalid initial heap size: %s\n", option->optionString); 2464 describe_range_error(errcode); 2465 return JNI_EINVAL; 2466 } 2467 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2468 // Currently the minimum size and the initial heap sizes are the same. 2469 set_min_heap_size(InitialHeapSize); 2470 // -Xmx 2471 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2472 julong long_max_heap_size = 0; 2473 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2474 if (errcode != arg_in_range) { 2475 jio_fprintf(defaultStream::error_stream(), 2476 "Invalid maximum heap size: %s\n", option->optionString); 2477 describe_range_error(errcode); 2478 return JNI_EINVAL; 2479 } 2480 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2481 // Xmaxf 2482 } else if (match_option(option, "-Xmaxf", &tail)) { 2483 int maxf = (int)(atof(tail) * 100); 2484 if (maxf < 0 || maxf > 100) { 2485 jio_fprintf(defaultStream::error_stream(), 2486 "Bad max heap free percentage size: %s\n", 2487 option->optionString); 2488 return JNI_EINVAL; 2489 } else { 2490 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2491 } 2492 // Xminf 2493 } else if (match_option(option, "-Xminf", &tail)) { 2494 int minf = (int)(atof(tail) * 100); 2495 if (minf < 0 || minf > 100) { 2496 jio_fprintf(defaultStream::error_stream(), 2497 "Bad min heap free percentage size: %s\n", 2498 option->optionString); 2499 return JNI_EINVAL; 2500 } else { 2501 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2502 } 2503 // -Xss 2504 } else if (match_option(option, "-Xss", &tail)) { 2505 julong long_ThreadStackSize = 0; 2506 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2507 if (errcode != arg_in_range) { 2508 jio_fprintf(defaultStream::error_stream(), 2509 "Invalid thread stack size: %s\n", option->optionString); 2510 describe_range_error(errcode); 2511 return JNI_EINVAL; 2512 } 2513 // Internally track ThreadStackSize in units of 1024 bytes. 2514 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2515 round_to((int)long_ThreadStackSize, K) / K); 2516 // -Xoss 2517 } else if (match_option(option, "-Xoss", &tail)) { 2518 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2519 // -Xmaxjitcodesize 2520 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2521 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2522 julong long_ReservedCodeCacheSize = 0; 2523 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 2524 (size_t)InitialCodeCacheSize); 2525 if (errcode != arg_in_range) { 2526 jio_fprintf(defaultStream::error_stream(), 2527 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n", 2528 option->optionString, InitialCodeCacheSize/K); 2529 describe_range_error(errcode); 2530 return JNI_EINVAL; 2531 } 2532 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2533 // -green 2534 } else if (match_option(option, "-green", &tail)) { 2535 jio_fprintf(defaultStream::error_stream(), 2536 "Green threads support not available\n"); 2537 return JNI_EINVAL; 2538 // -native 2539 } else if (match_option(option, "-native", &tail)) { 2540 // HotSpot always uses native threads, ignore silently for compatibility 2541 // -Xsqnopause 2542 } else if (match_option(option, "-Xsqnopause", &tail)) { 2543 // EVM option, ignore silently for compatibility 2544 // -Xrs 2545 } else if (match_option(option, "-Xrs", &tail)) { 2546 // Classic/EVM option, new functionality 2547 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2548 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2549 // change default internal VM signals used - lower case for back compat 2550 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2551 // -Xoptimize 2552 } else if (match_option(option, "-Xoptimize", &tail)) { 2553 // EVM option, ignore silently for compatibility 2554 // -Xprof 2555 } else if (match_option(option, "-Xprof", &tail)) { 2556#if INCLUDE_FPROF 2557 _has_profile = true; 2558#else // INCLUDE_FPROF 2559 jio_fprintf(defaultStream::error_stream(), 2560 "Flat profiling is not supported in this VM.\n"); 2561 return JNI_ERR; 2562#endif // INCLUDE_FPROF 2563 // -Xaprof 2564 } else if (match_option(option, "-Xaprof", &tail)) { 2565 _has_alloc_profile = true; 2566 // -Xconcurrentio 2567 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2568 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2569 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2570 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2571 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2572 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2573 2574 // -Xinternalversion 2575 } else if (match_option(option, "-Xinternalversion", &tail)) { 2576 jio_fprintf(defaultStream::output_stream(), "%s\n", 2577 VM_Version::internal_vm_info_string()); 2578 vm_exit(0); 2579#ifndef PRODUCT 2580 // -Xprintflags 2581 } else if (match_option(option, "-Xprintflags", &tail)) { 2582 CommandLineFlags::printFlags(tty, false); 2583 vm_exit(0); 2584#endif 2585 // -D 2586 } else if (match_option(option, "-D", &tail)) { 2587 if (!add_property(tail)) { 2588 return JNI_ENOMEM; 2589 } 2590 // Out of the box management support 2591 if (match_option(option, "-Dcom.sun.management", &tail)) { 2592#if INCLUDE_MANAGEMENT 2593 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2594#else 2595 jio_fprintf(defaultStream::output_stream(), 2596 "-Dcom.sun.management is not supported in this VM.\n"); 2597 return JNI_ERR; 2598#endif 2599 } 2600 // -Xint 2601 } else if (match_option(option, "-Xint", &tail)) { 2602 set_mode_flags(_int); 2603 // -Xmixed 2604 } else if (match_option(option, "-Xmixed", &tail)) { 2605 set_mode_flags(_mixed); 2606 // -Xcomp 2607 } else if (match_option(option, "-Xcomp", &tail)) { 2608 // for testing the compiler; turn off all flags that inhibit compilation 2609 set_mode_flags(_comp); 2610 // -Xshare:dump 2611 } else if (match_option(option, "-Xshare:dump", &tail)) { 2612 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2613 set_mode_flags(_int); // Prevent compilation, which creates objects 2614 // -Xshare:on 2615 } else if (match_option(option, "-Xshare:on", &tail)) { 2616 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2617 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2618 // -Xshare:auto 2619 } else if (match_option(option, "-Xshare:auto", &tail)) { 2620 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2621 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2622 // -Xshare:off 2623 } else if (match_option(option, "-Xshare:off", &tail)) { 2624 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2625 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2626 // -Xverify 2627 } else if (match_option(option, "-Xverify", &tail)) { 2628 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2629 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2630 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2631 } else if (strcmp(tail, ":remote") == 0) { 2632 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2633 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2634 } else if (strcmp(tail, ":none") == 0) { 2635 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2636 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2637 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2638 return JNI_EINVAL; 2639 } 2640 // -Xdebug 2641 } else if (match_option(option, "-Xdebug", &tail)) { 2642 // note this flag has been used, then ignore 2643 set_xdebug_mode(true); 2644 // -Xnoagent 2645 } else if (match_option(option, "-Xnoagent", &tail)) { 2646 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2647 } else if (match_option(option, "-Xboundthreads", &tail)) { 2648 // Bind user level threads to kernel threads (Solaris only) 2649 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2650 } else if (match_option(option, "-Xloggc:", &tail)) { 2651 // Redirect GC output to the file. -Xloggc:<filename> 2652 // ostream_init_log(), when called will use this filename 2653 // to initialize a fileStream. 2654 _gc_log_filename = strdup(tail); 2655 FLAG_SET_CMDLINE(bool, PrintGC, true); 2656 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2657 2658 // JNI hooks 2659 } else if (match_option(option, "-Xcheck", &tail)) { 2660 if (!strcmp(tail, ":jni")) { 2661#if !INCLUDE_JNI_CHECK 2662 warning("JNI CHECKING is not supported in this VM"); 2663#else 2664 CheckJNICalls = true; 2665#endif // INCLUDE_JNI_CHECK 2666 } else if (is_bad_option(option, args->ignoreUnrecognized, 2667 "check")) { 2668 return JNI_EINVAL; 2669 } 2670 } else if (match_option(option, "vfprintf", &tail)) { 2671 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2672 } else if (match_option(option, "exit", &tail)) { 2673 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2674 } else if (match_option(option, "abort", &tail)) { 2675 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2676 // -XX:+AggressiveHeap 2677 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2678 2679 // This option inspects the machine and attempts to set various 2680 // parameters to be optimal for long-running, memory allocation 2681 // intensive jobs. It is intended for machines with large 2682 // amounts of cpu and memory. 2683 2684 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2685 // VM, but we may not be able to represent the total physical memory 2686 // available (like having 8gb of memory on a box but using a 32bit VM). 2687 // Thus, we need to make sure we're using a julong for intermediate 2688 // calculations. 2689 julong initHeapSize; 2690 julong total_memory = os::physical_memory(); 2691 2692 if (total_memory < (julong)256*M) { 2693 jio_fprintf(defaultStream::error_stream(), 2694 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2695 vm_exit(1); 2696 } 2697 2698 // The heap size is half of available memory, or (at most) 2699 // all of possible memory less 160mb (leaving room for the OS 2700 // when using ISM). This is the maximum; because adaptive sizing 2701 // is turned on below, the actual space used may be smaller. 2702 2703 initHeapSize = MIN2(total_memory / (julong)2, 2704 total_memory - (julong)160*M); 2705 2706 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2707 2708 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2709 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2710 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2711 // Currently the minimum size and the initial heap sizes are the same. 2712 set_min_heap_size(initHeapSize); 2713 } 2714 if (FLAG_IS_DEFAULT(NewSize)) { 2715 // Make the young generation 3/8ths of the total heap. 2716 FLAG_SET_CMDLINE(uintx, NewSize, 2717 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2718 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2719 } 2720 2721#ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 2722 FLAG_SET_DEFAULT(UseLargePages, true); 2723#endif 2724 2725 // Increase some data structure sizes for efficiency 2726 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2727 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2728 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2729 2730 // See the OldPLABSize comment below, but replace 'after promotion' 2731 // with 'after copying'. YoungPLABSize is the size of the survivor 2732 // space per-gc-thread buffers. The default is 4kw. 2733 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2734 2735 // OldPLABSize is the size of the buffers in the old gen that 2736 // UseParallelGC uses to promote live data that doesn't fit in the 2737 // survivor spaces. At any given time, there's one for each gc thread. 2738 // The default size is 1kw. These buffers are rarely used, since the 2739 // survivor spaces are usually big enough. For specjbb, however, there 2740 // are occasions when there's lots of live data in the young gen 2741 // and we end up promoting some of it. We don't have a definite 2742 // explanation for why bumping OldPLABSize helps, but the theory 2743 // is that a bigger PLAB results in retaining something like the 2744 // original allocation order after promotion, which improves mutator 2745 // locality. A minor effect may be that larger PLABs reduce the 2746 // number of PLAB allocation events during gc. The value of 8kw 2747 // was arrived at by experimenting with specjbb. 2748 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2749 2750 // Enable parallel GC and adaptive generation sizing 2751 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2752 FLAG_SET_DEFAULT(ParallelGCThreads, 2753 Abstract_VM_Version::parallel_worker_threads()); 2754 2755 // Encourage steady state memory management 2756 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2757 2758 // This appears to improve mutator locality 2759 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2760 2761 // Get around early Solaris scheduling bug 2762 // (affinity vs other jobs on system) 2763 // but disallow DR and offlining (5008695). 2764 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 2765 2766 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 2767 // The last option must always win. 2768 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 2769 FLAG_SET_CMDLINE(bool, NeverTenure, true); 2770 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 2771 // The last option must always win. 2772 FLAG_SET_CMDLINE(bool, NeverTenure, false); 2773 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 2774 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 2775 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 2776 jio_fprintf(defaultStream::error_stream(), 2777 "Please use CMSClassUnloadingEnabled in place of " 2778 "CMSPermGenSweepingEnabled in the future\n"); 2779 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 2780 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 2781 jio_fprintf(defaultStream::error_stream(), 2782 "Please use -XX:+UseGCOverheadLimit in place of " 2783 "-XX:+UseGCTimeLimit in the future\n"); 2784 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 2785 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 2786 jio_fprintf(defaultStream::error_stream(), 2787 "Please use -XX:-UseGCOverheadLimit in place of " 2788 "-XX:-UseGCTimeLimit in the future\n"); 2789 // The TLE options are for compatibility with 1.3 and will be 2790 // removed without notice in a future release. These options 2791 // are not to be documented. 2792 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 2793 // No longer used. 2794 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 2795 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 2796 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 2797 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2798 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 2799 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 2800 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 2801 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 2802 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 2803 // No longer used. 2804 } else if (match_option(option, "-XX:TLESize=", &tail)) { 2805 julong long_tlab_size = 0; 2806 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 2807 if (errcode != arg_in_range) { 2808 jio_fprintf(defaultStream::error_stream(), 2809 "Invalid TLAB size: %s\n", option->optionString); 2810 describe_range_error(errcode); 2811 return JNI_EINVAL; 2812 } 2813 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 2814 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 2815 // No longer used. 2816 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 2817 FLAG_SET_CMDLINE(bool, UseTLAB, true); 2818 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 2819 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2820SOLARIS_ONLY( 2821 } else if (match_option(option, "-XX:+UsePermISM", &tail)) { 2822 warning("-XX:+UsePermISM is obsolete."); 2823 FLAG_SET_CMDLINE(bool, UseISM, true); 2824 } else if (match_option(option, "-XX:-UsePermISM", &tail)) { 2825 FLAG_SET_CMDLINE(bool, UseISM, false); 2826) 2827 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 2828 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 2829 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 2830 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 2831 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 2832 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 2833 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 2834#if defined(DTRACE_ENABLED) 2835 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 2836 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 2837 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 2838 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 2839#else // defined(DTRACE_ENABLED) 2840 jio_fprintf(defaultStream::error_stream(), 2841 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 2842 return JNI_EINVAL; 2843#endif // defined(DTRACE_ENABLED) 2844#ifdef ASSERT 2845 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 2846 FLAG_SET_CMDLINE(bool, FullGCALot, true); 2847 // disable scavenge before parallel mark-compact 2848 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2849#endif 2850 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 2851 julong cms_blocks_to_claim = (julong)atol(tail); 2852 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2853 jio_fprintf(defaultStream::error_stream(), 2854 "Please use -XX:OldPLABSize in place of " 2855 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 2856 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 2857 julong cms_blocks_to_claim = (julong)atol(tail); 2858 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2859 jio_fprintf(defaultStream::error_stream(), 2860 "Please use -XX:OldPLABSize in place of " 2861 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 2862 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 2863 julong old_plab_size = 0; 2864 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 2865 if (errcode != arg_in_range) { 2866 jio_fprintf(defaultStream::error_stream(), 2867 "Invalid old PLAB size: %s\n", option->optionString); 2868 describe_range_error(errcode); 2869 return JNI_EINVAL; 2870 } 2871 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 2872 jio_fprintf(defaultStream::error_stream(), 2873 "Please use -XX:OldPLABSize in place of " 2874 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 2875 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 2876 julong young_plab_size = 0; 2877 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 2878 if (errcode != arg_in_range) { 2879 jio_fprintf(defaultStream::error_stream(), 2880 "Invalid young PLAB size: %s\n", option->optionString); 2881 describe_range_error(errcode); 2882 return JNI_EINVAL; 2883 } 2884 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 2885 jio_fprintf(defaultStream::error_stream(), 2886 "Please use -XX:YoungPLABSize in place of " 2887 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 2888 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 2889 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 2890 julong stack_size = 0; 2891 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 2892 if (errcode != arg_in_range) { 2893 jio_fprintf(defaultStream::error_stream(), 2894 "Invalid mark stack size: %s\n", option->optionString); 2895 describe_range_error(errcode); 2896 return JNI_EINVAL; 2897 } 2898 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 2899 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 2900 julong max_stack_size = 0; 2901 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 2902 if (errcode != arg_in_range) { 2903 jio_fprintf(defaultStream::error_stream(), 2904 "Invalid maximum mark stack size: %s\n", 2905 option->optionString); 2906 describe_range_error(errcode); 2907 return JNI_EINVAL; 2908 } 2909 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 2910 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 2911 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 2912 uintx conc_threads = 0; 2913 if (!parse_uintx(tail, &conc_threads, 1)) { 2914 jio_fprintf(defaultStream::error_stream(), 2915 "Invalid concurrent threads: %s\n", option->optionString); 2916 return JNI_EINVAL; 2917 } 2918 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 2919 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 2920 julong max_direct_memory_size = 0; 2921 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 2922 if (errcode != arg_in_range) { 2923 jio_fprintf(defaultStream::error_stream(), 2924 "Invalid maximum direct memory size: %s\n", 2925 option->optionString); 2926 describe_range_error(errcode); 2927 return JNI_EINVAL; 2928 } 2929 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 2930 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) { 2931 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go 2932 // away and will cause VM initialization failures! 2933 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release."); 2934 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true); 2935#if !INCLUDE_MANAGEMENT 2936 } else if (match_option(option, "-XX:+ManagementServer", &tail)) { 2937 jio_fprintf(defaultStream::error_stream(), 2938 "ManagementServer is not supported in this VM.\n"); 2939 return JNI_ERR; 2940#endif // INCLUDE_MANAGEMENT 2941 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2942 // Skip -XX:Flags= since that case has already been handled 2943 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 2944 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2945 return JNI_EINVAL; 2946 } 2947 } 2948 // Unknown option 2949 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2950 return JNI_ERR; 2951 } 2952 } 2953 2954 // Change the default value for flags which have different default values 2955 // when working with older JDKs. 2956#ifdef LINUX 2957 if (JDK_Version::current().compare_major(6) <= 0 && 2958 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 2959 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 2960 } 2961#endif // LINUX 2962 return JNI_OK; 2963} 2964 2965jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 2966 // This must be done after all -D arguments have been processed. 2967 scp_p->expand_endorsed(); 2968 2969 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 2970 // Assemble the bootclasspath elements into the final path. 2971 Arguments::set_sysclasspath(scp_p->combined_path()); 2972 } 2973 2974 // This must be done after all arguments have been processed. 2975 // java_compiler() true means set to "NONE" or empty. 2976 if (java_compiler() && !xdebug_mode()) { 2977 // For backwards compatibility, we switch to interpreted mode if 2978 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 2979 // not specified. 2980 set_mode_flags(_int); 2981 } 2982 if (CompileThreshold == 0) { 2983 set_mode_flags(_int); 2984 } 2985 2986#ifndef COMPILER2 2987 // Don't degrade server performance for footprint 2988 if (FLAG_IS_DEFAULT(UseLargePages) && 2989 MaxHeapSize < LargePageHeapSizeThreshold) { 2990 // No need for large granularity pages w/small heaps. 2991 // Note that large pages are enabled/disabled for both the 2992 // Java heap and the code cache. 2993 FLAG_SET_DEFAULT(UseLargePages, false); 2994 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false)); 2995 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false)); 2996 } 2997 2998 // Tiered compilation is undefined with C1. 2999 TieredCompilation = false; 3000#else 3001 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3002 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3003 } 3004#endif 3005 3006 // If we are running in a headless jre, force java.awt.headless property 3007 // to be true unless the property has already been set. 3008 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3009 if (os::is_headless_jre()) { 3010 const char* headless = Arguments::get_property("java.awt.headless"); 3011 if (headless == NULL) { 3012 char envbuffer[128]; 3013 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3014 if (!add_property("java.awt.headless=true")) { 3015 return JNI_ENOMEM; 3016 } 3017 } else { 3018 char buffer[256]; 3019 strcpy(buffer, "java.awt.headless="); 3020 strcat(buffer, envbuffer); 3021 if (!add_property(buffer)) { 3022 return JNI_ENOMEM; 3023 } 3024 } 3025 } 3026 } 3027 3028 if (!check_vm_args_consistency()) { 3029 return JNI_ERR; 3030 } 3031 3032 return JNI_OK; 3033} 3034 3035jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3036 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3037 scp_assembly_required_p); 3038} 3039 3040jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3041 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3042 scp_assembly_required_p); 3043} 3044 3045jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3046 const int N_MAX_OPTIONS = 64; 3047 const int OPTION_BUFFER_SIZE = 1024; 3048 char buffer[OPTION_BUFFER_SIZE]; 3049 3050 // The variable will be ignored if it exceeds the length of the buffer. 3051 // Don't check this variable if user has special privileges 3052 // (e.g. unix su command). 3053 if (os::getenv(name, buffer, sizeof(buffer)) && 3054 !os::have_special_privileges()) { 3055 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3056 jio_fprintf(defaultStream::error_stream(), 3057 "Picked up %s: %s\n", name, buffer); 3058 char* rd = buffer; // pointer to the input string (rd) 3059 int i; 3060 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3061 while (isspace(*rd)) rd++; // skip whitespace 3062 if (*rd == 0) break; // we re done when the input string is read completely 3063 3064 // The output, option string, overwrites the input string. 3065 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3066 // input string (rd). 3067 char* wrt = rd; 3068 3069 options[i++].optionString = wrt; // Fill in option 3070 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3071 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3072 int quote = *rd; // matching quote to look for 3073 rd++; // don't copy open quote 3074 while (*rd != quote) { // include everything (even spaces) up until quote 3075 if (*rd == 0) { // string termination means unmatched string 3076 jio_fprintf(defaultStream::error_stream(), 3077 "Unmatched quote in %s\n", name); 3078 return JNI_ERR; 3079 } 3080 *wrt++ = *rd++; // copy to option string 3081 } 3082 rd++; // don't copy close quote 3083 } else { 3084 *wrt++ = *rd++; // copy to option string 3085 } 3086 } 3087 // Need to check if we're done before writing a NULL, 3088 // because the write could be to the byte that rd is pointing to. 3089 if (*rd++ == 0) { 3090 *wrt = 0; 3091 break; 3092 } 3093 *wrt = 0; // Zero terminate option 3094 } 3095 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3096 JavaVMInitArgs vm_args; 3097 vm_args.version = JNI_VERSION_1_2; 3098 vm_args.options = options; 3099 vm_args.nOptions = i; 3100 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3101 3102 if (PrintVMOptions) { 3103 const char* tail; 3104 for (int i = 0; i < vm_args.nOptions; i++) { 3105 const JavaVMOption *option = vm_args.options + i; 3106 if (match_option(option, "-XX:", &tail)) { 3107 logOption(tail); 3108 } 3109 } 3110 } 3111 3112 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR)); 3113 } 3114 return JNI_OK; 3115} 3116 3117void Arguments::set_shared_spaces_flags() { 3118 const bool must_share = DumpSharedSpaces || RequireSharedSpaces; 3119 const bool might_share = must_share || UseSharedSpaces; 3120 3121 // CompressedOops cannot be used with CDS. The offsets of oopmaps and 3122 // static fields are incorrect in the archive. With some more clever 3123 // initialization, this restriction can probably be lifted. 3124 // ??? UseLargePages might be okay now 3125 const bool cannot_share = UseCompressedOops || 3126 (UseLargePages && FLAG_IS_CMDLINE(UseLargePages)); 3127 if (cannot_share) { 3128 if (must_share) { 3129 warning("disabling large pages %s" 3130 "because of %s", "" LP64_ONLY("and compressed oops "), 3131 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on"); 3132 FLAG_SET_CMDLINE(bool, UseLargePages, false); 3133 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false)); 3134 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false)); 3135 } else { 3136 // Prefer compressed oops and large pages to class data sharing 3137 if (UseSharedSpaces && Verbose) { 3138 warning("turning off use of shared archive because of large pages%s", 3139 "" LP64_ONLY(" and/or compressed oops")); 3140 } 3141 no_shared_spaces(); 3142 } 3143 } else if (UseLargePages && might_share) { 3144 // Disable large pages to allow shared spaces. This is sub-optimal, since 3145 // there may not even be a shared archive to use. 3146 FLAG_SET_DEFAULT(UseLargePages, false); 3147 } 3148 3149 if (DumpSharedSpaces) { 3150 if (RequireSharedSpaces) { 3151 warning("cannot dump shared archive while using shared archive"); 3152 } 3153 UseSharedSpaces = false; 3154 } 3155} 3156 3157// Disable options not supported in this release, with a warning if they 3158// were explicitly requested on the command-line 3159#define UNSUPPORTED_OPTION(opt, description) \ 3160do { \ 3161 if (opt) { \ 3162 if (FLAG_IS_CMDLINE(opt)) { \ 3163 warning(description " is disabled in this release."); \ 3164 } \ 3165 FLAG_SET_DEFAULT(opt, false); \ 3166 } \ 3167} while(0) 3168 3169 3170#define UNSUPPORTED_GC_OPTION(gc) \ 3171do { \ 3172 if (gc) { \ 3173 if (FLAG_IS_CMDLINE(gc)) { \ 3174 warning(#gc " is not supported in this VM. Using Serial GC."); \ 3175 } \ 3176 FLAG_SET_DEFAULT(gc, false); \ 3177 } \ 3178} while(0) 3179 3180#if !INCLUDE_ALL_GCS 3181static void force_serial_gc() { 3182 FLAG_SET_DEFAULT(UseSerialGC, true); 3183 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 3184 UNSUPPORTED_GC_OPTION(UseG1GC); 3185 UNSUPPORTED_GC_OPTION(UseParallelGC); 3186 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3187 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3188 UNSUPPORTED_GC_OPTION(UseParNewGC); 3189} 3190#endif // INCLUDE_ALL_GCS 3191 3192// Parse entry point called from JNI_CreateJavaVM 3193 3194jint Arguments::parse(const JavaVMInitArgs* args) { 3195 3196 // Sharing support 3197 // Construct the path to the archive 3198 char jvm_path[JVM_MAXPATHLEN]; 3199 os::jvm_path(jvm_path, sizeof(jvm_path)); 3200 char *end = strrchr(jvm_path, *os::file_separator()); 3201 if (end != NULL) *end = '\0'; 3202 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) + 3203 strlen(os::file_separator()) + 20, mtInternal); 3204 if (shared_archive_path == NULL) return JNI_ENOMEM; 3205 strcpy(shared_archive_path, jvm_path); 3206 strcat(shared_archive_path, os::file_separator()); 3207 strcat(shared_archive_path, "classes"); 3208 strcat(shared_archive_path, ".jsa"); 3209 SharedArchivePath = shared_archive_path; 3210 3211 // Remaining part of option string 3212 const char* tail; 3213 3214 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3215 const char* hotspotrc = ".hotspotrc"; 3216 bool settings_file_specified = false; 3217 bool needs_hotspotrc_warning = false; 3218 3219 const char* flags_file; 3220 int index; 3221 for (index = 0; index < args->nOptions; index++) { 3222 const JavaVMOption *option = args->options + index; 3223 if (match_option(option, "-XX:Flags=", &tail)) { 3224 flags_file = tail; 3225 settings_file_specified = true; 3226 } 3227 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3228 PrintVMOptions = true; 3229 } 3230 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3231 PrintVMOptions = false; 3232 } 3233 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3234 IgnoreUnrecognizedVMOptions = true; 3235 } 3236 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3237 IgnoreUnrecognizedVMOptions = false; 3238 } 3239 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3240 CommandLineFlags::printFlags(tty, false); 3241 vm_exit(0); 3242 } 3243 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3244#if INCLUDE_NMT 3245 MemTracker::init_tracking_options(tail); 3246#else 3247 jio_fprintf(defaultStream::error_stream(), 3248 "Native Memory Tracking is not supported in this VM\n"); 3249 return JNI_ERR; 3250#endif 3251 } 3252 3253 3254#ifndef PRODUCT 3255 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3256 CommandLineFlags::printFlags(tty, true); 3257 vm_exit(0); 3258 } 3259#endif 3260 } 3261 3262 if (IgnoreUnrecognizedVMOptions) { 3263 // uncast const to modify the flag args->ignoreUnrecognized 3264 *(jboolean*)(&args->ignoreUnrecognized) = true; 3265 } 3266 3267 // Parse specified settings file 3268 if (settings_file_specified) { 3269 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3270 return JNI_EINVAL; 3271 } 3272 } else { 3273#ifdef ASSERT 3274 // Parse default .hotspotrc settings file 3275 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3276 return JNI_EINVAL; 3277 } 3278#else 3279 struct stat buf; 3280 if (os::stat(hotspotrc, &buf) == 0) { 3281 needs_hotspotrc_warning = true; 3282 } 3283#endif 3284 } 3285 3286 if (PrintVMOptions) { 3287 for (index = 0; index < args->nOptions; index++) { 3288 const JavaVMOption *option = args->options + index; 3289 if (match_option(option, "-XX:", &tail)) { 3290 logOption(tail); 3291 } 3292 } 3293 } 3294 3295 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3296 jint result = parse_vm_init_args(args); 3297 if (result != JNI_OK) { 3298 return result; 3299 } 3300 3301 // Delay warning until here so that we've had a chance to process 3302 // the -XX:-PrintWarnings flag 3303 if (needs_hotspotrc_warning) { 3304 warning("%s file is present but has been ignored. " 3305 "Run with -XX:Flags=%s to load the file.", 3306 hotspotrc, hotspotrc); 3307 } 3308 3309#ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3310 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3311#endif 3312 3313#if INCLUDE_ALL_GCS 3314 #if (defined JAVASE_EMBEDDED || defined ARM) 3315 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3316 #endif 3317#endif 3318 3319#ifndef PRODUCT 3320 if (TraceBytecodesAt != 0) { 3321 TraceBytecodes = true; 3322 } 3323 if (CountCompiledCalls) { 3324 if (UseCounterDecay) { 3325 warning("UseCounterDecay disabled because CountCalls is set"); 3326 UseCounterDecay = false; 3327 } 3328 } 3329#endif // PRODUCT 3330 3331 // JSR 292 is not supported before 1.7 3332 if (!JDK_Version::is_gte_jdk17x_version()) { 3333 if (EnableInvokeDynamic) { 3334 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3335 warning("JSR 292 is not supported before 1.7. Disabling support."); 3336 } 3337 EnableInvokeDynamic = false; 3338 } 3339 } 3340 3341 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 3342 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3343 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 3344 } 3345 ScavengeRootsInCode = 1; 3346 } 3347 3348 if (PrintGCDetails) { 3349 // Turn on -verbose:gc options as well 3350 PrintGC = true; 3351 } 3352 3353 if (!JDK_Version::is_gte_jdk18x_version()) { 3354 // To avoid changing the log format for 7 updates this flag is only 3355 // true by default in JDK8 and above. 3356 if (FLAG_IS_DEFAULT(PrintGCCause)) { 3357 FLAG_SET_DEFAULT(PrintGCCause, false); 3358 } 3359 } 3360 3361 // Set object alignment values. 3362 set_object_alignment(); 3363 3364#if !INCLUDE_ALL_GCS 3365 force_serial_gc(); 3366#endif // INCLUDE_ALL_GCS 3367#if !INCLUDE_CDS 3368 if (DumpSharedSpaces || RequireSharedSpaces) { 3369 jio_fprintf(defaultStream::error_stream(), 3370 "Shared spaces are not supported in this VM\n"); 3371 return JNI_ERR; 3372 } 3373 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3374 warning("Shared spaces are not supported in this VM"); 3375 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3376 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3377 } 3378 no_shared_spaces(); 3379#endif // INCLUDE_CDS 3380 3381 // Set flags based on ergonomics. 3382 set_ergonomics_flags(); 3383 3384 set_shared_spaces_flags(); 3385 3386 // Check the GC selections again. 3387 if (!check_gc_consistency()) { 3388 return JNI_EINVAL; 3389 } 3390 3391 if (TieredCompilation) { 3392 set_tiered_flags(); 3393 } else { 3394 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3395 if (CompilationPolicyChoice >= 2) { 3396 vm_exit_during_initialization( 3397 "Incompatible compilation policy selected", NULL); 3398 } 3399 } 3400 3401 // Set heap size based on available physical memory 3402 set_heap_size(); 3403 3404#if INCLUDE_ALL_GCS 3405 // Set per-collector flags 3406 if (UseParallelGC || UseParallelOldGC) { 3407 set_parallel_gc_flags(); 3408 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below 3409 set_cms_and_parnew_gc_flags(); 3410 } else if (UseParNewGC) { // skipped if CMS is set above 3411 set_parnew_gc_flags(); 3412 } else if (UseG1GC) { 3413 set_g1_gc_flags(); 3414 } 3415 check_deprecated_gcs(); 3416 check_deprecated_gc_flags(); 3417 if (AssumeMP && !UseSerialGC) { 3418 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 3419 warning("If the number of processors is expected to increase from one, then" 3420 " you should configure the number of parallel GC threads appropriately" 3421 " using -XX:ParallelGCThreads=N"); 3422 } 3423 } 3424#else // INCLUDE_ALL_GCS 3425 assert(verify_serial_gc_flags(), "SerialGC unset"); 3426#endif // INCLUDE_ALL_GCS 3427 3428 // Set bytecode rewriting flags 3429 set_bytecode_flags(); 3430 3431 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 3432 set_aggressive_opts_flags(); 3433 3434 // Turn off biased locking for locking debug mode flags, 3435 // which are subtlely different from each other but neither works with 3436 // biased locking. 3437 if (UseHeavyMonitors 3438#ifdef COMPILER1 3439 || !UseFastLocking 3440#endif // COMPILER1 3441 ) { 3442 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3443 // flag set to true on command line; warn the user that they 3444 // can't enable biased locking here 3445 warning("Biased Locking is not supported with locking debug flags" 3446 "; ignoring UseBiasedLocking flag." ); 3447 } 3448 UseBiasedLocking = false; 3449 } 3450 3451#ifdef CC_INTERP 3452 // Clear flags not supported by the C++ interpreter 3453 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3454 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3455 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3456 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false)); 3457#endif // CC_INTERP 3458 3459#ifdef COMPILER2 3460 if (!UseBiasedLocking || EmitSync != 0) { 3461 UseOptoBiasInlining = false; 3462 } 3463 if (!EliminateLocks) { 3464 EliminateNestedLocks = false; 3465 } 3466 if (!Inline) { 3467 IncrementalInline = false; 3468 } 3469#ifndef PRODUCT 3470 if (!IncrementalInline) { 3471 AlwaysIncrementalInline = false; 3472 } 3473#endif 3474 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) { 3475 // incremental inlining: bump MaxNodeLimit 3476 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000); 3477 } 3478#endif 3479 3480 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3481 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3482 DebugNonSafepoints = true; 3483 } 3484 3485#ifndef PRODUCT 3486 if (CompileTheWorld) { 3487 // Force NmethodSweeper to sweep whole CodeCache each time. 3488 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3489 NmethodSweepFraction = 1; 3490 } 3491 } 3492#endif 3493 3494 if (PrintCommandLineFlags) { 3495 CommandLineFlags::printSetFlags(tty); 3496 } 3497 3498 // Apply CPU specific policy for the BiasedLocking 3499 if (UseBiasedLocking) { 3500 if (!VM_Version::use_biased_locking() && 3501 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3502 UseBiasedLocking = false; 3503 } 3504 } 3505 3506 // set PauseAtExit if the gamma launcher was used and a debugger is attached 3507 // but only if not already set on the commandline 3508 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) { 3509 bool set = false; 3510 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set); 3511 if (!set) { 3512 FLAG_SET_DEFAULT(PauseAtExit, true); 3513 } 3514 } 3515 3516 return JNI_OK; 3517} 3518 3519jint Arguments::adjust_after_os() { 3520#if INCLUDE_ALL_GCS 3521 if (UseParallelGC || UseParallelOldGC) { 3522 if (UseNUMA) { 3523 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3524 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3525 } 3526 // For those collectors or operating systems (eg, Windows) that do 3527 // not support full UseNUMA, we will map to UseNUMAInterleaving for now 3528 UseNUMAInterleaving = true; 3529 } 3530 } 3531#endif // INCLUDE_ALL_GCS 3532 return JNI_OK; 3533} 3534 3535int Arguments::PropertyList_count(SystemProperty* pl) { 3536 int count = 0; 3537 while(pl != NULL) { 3538 count++; 3539 pl = pl->next(); 3540 } 3541 return count; 3542} 3543 3544const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3545 assert(key != NULL, "just checking"); 3546 SystemProperty* prop; 3547 for (prop = pl; prop != NULL; prop = prop->next()) { 3548 if (strcmp(key, prop->key()) == 0) return prop->value(); 3549 } 3550 return NULL; 3551} 3552 3553const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3554 int count = 0; 3555 const char* ret_val = NULL; 3556 3557 while(pl != NULL) { 3558 if(count >= index) { 3559 ret_val = pl->key(); 3560 break; 3561 } 3562 count++; 3563 pl = pl->next(); 3564 } 3565 3566 return ret_val; 3567} 3568 3569char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3570 int count = 0; 3571 char* ret_val = NULL; 3572 3573 while(pl != NULL) { 3574 if(count >= index) { 3575 ret_val = pl->value(); 3576 break; 3577 } 3578 count++; 3579 pl = pl->next(); 3580 } 3581 3582 return ret_val; 3583} 3584 3585void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3586 SystemProperty* p = *plist; 3587 if (p == NULL) { 3588 *plist = new_p; 3589 } else { 3590 while (p->next() != NULL) { 3591 p = p->next(); 3592 } 3593 p->set_next(new_p); 3594 } 3595} 3596 3597void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3598 if (plist == NULL) 3599 return; 3600 3601 SystemProperty* new_p = new SystemProperty(k, v, true); 3602 PropertyList_add(plist, new_p); 3603} 3604 3605// This add maintains unique property key in the list. 3606void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3607 if (plist == NULL) 3608 return; 3609 3610 // If property key exist then update with new value. 3611 SystemProperty* prop; 3612 for (prop = *plist; prop != NULL; prop = prop->next()) { 3613 if (strcmp(k, prop->key()) == 0) { 3614 if (append) { 3615 prop->append_value(v); 3616 } else { 3617 prop->set_value(v); 3618 } 3619 return; 3620 } 3621 } 3622 3623 PropertyList_add(plist, k, v); 3624} 3625 3626// Copies src into buf, replacing "%%" with "%" and "%p" with pid 3627// Returns true if all of the source pointed by src has been copied over to 3628// the destination buffer pointed by buf. Otherwise, returns false. 3629// Notes: 3630// 1. If the length (buflen) of the destination buffer excluding the 3631// NULL terminator character is not long enough for holding the expanded 3632// pid characters, it also returns false instead of returning the partially 3633// expanded one. 3634// 2. The passed in "buflen" should be large enough to hold the null terminator. 3635bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3636 char* buf, size_t buflen) { 3637 const char* p = src; 3638 char* b = buf; 3639 const char* src_end = &src[srclen]; 3640 char* buf_end = &buf[buflen - 1]; 3641 3642 while (p < src_end && b < buf_end) { 3643 if (*p == '%') { 3644 switch (*(++p)) { 3645 case '%': // "%%" ==> "%" 3646 *b++ = *p++; 3647 break; 3648 case 'p': { // "%p" ==> current process id 3649 // buf_end points to the character before the last character so 3650 // that we could write '\0' to the end of the buffer. 3651 size_t buf_sz = buf_end - b + 1; 3652 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3653 3654 // if jio_snprintf fails or the buffer is not long enough to hold 3655 // the expanded pid, returns false. 3656 if (ret < 0 || ret >= (int)buf_sz) { 3657 return false; 3658 } else { 3659 b += ret; 3660 assert(*b == '\0', "fail in copy_expand_pid"); 3661 if (p == src_end && b == buf_end + 1) { 3662 // reach the end of the buffer. 3663 return true; 3664 } 3665 } 3666 p++; 3667 break; 3668 } 3669 default : 3670 *b++ = '%'; 3671 } 3672 } else { 3673 *b++ = *p++; 3674 } 3675 } 3676 *b = '\0'; 3677 return (p == src_end); // return false if not all of the source was copied 3678} 3679