arguments.cpp revision 7877:cc8363b030d5
1/* 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "precompiled.hpp" 26#include "classfile/classLoader.hpp" 27#include "classfile/javaAssertions.hpp" 28#include "classfile/stringTable.hpp" 29#include "classfile/symbolTable.hpp" 30#include "compiler/compilerOracle.hpp" 31#include "memory/allocation.inline.hpp" 32#include "memory/cardTableRS.hpp" 33#include "memory/genCollectedHeap.hpp" 34#include "memory/referenceProcessor.hpp" 35#include "memory/universe.inline.hpp" 36#include "oops/oop.inline.hpp" 37#include "prims/jvmtiExport.hpp" 38#include "runtime/arguments.hpp" 39#include "runtime/arguments_ext.hpp" 40#include "runtime/globals_extension.hpp" 41#include "runtime/java.hpp" 42#include "runtime/os.hpp" 43#include "runtime/vm_version.hpp" 44#include "services/management.hpp" 45#include "services/memTracker.hpp" 46#include "utilities/defaultStream.hpp" 47#include "utilities/macros.hpp" 48#include "utilities/stringUtils.hpp" 49#include "utilities/taskqueue.hpp" 50#if INCLUDE_ALL_GCS 51#include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 52#include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 53#include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 54#endif // INCLUDE_ALL_GCS 55 56// Note: This is a special bug reporting site for the JVM 57#define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 58#define DEFAULT_JAVA_LAUNCHER "generic" 59 60// Disable options not supported in this release, with a warning if they 61// were explicitly requested on the command-line 62#define UNSUPPORTED_OPTION(opt, description) \ 63do { \ 64 if (opt) { \ 65 if (FLAG_IS_CMDLINE(opt)) { \ 66 warning(description " is disabled in this release."); \ 67 } \ 68 FLAG_SET_DEFAULT(opt, false); \ 69 } \ 70} while(0) 71 72#define UNSUPPORTED_GC_OPTION(gc) \ 73do { \ 74 if (gc) { \ 75 if (FLAG_IS_CMDLINE(gc)) { \ 76 warning(#gc " is not supported in this VM. Using Serial GC."); \ 77 } \ 78 FLAG_SET_DEFAULT(gc, false); \ 79 } \ 80} while(0) 81 82char** Arguments::_jvm_flags_array = NULL; 83int Arguments::_num_jvm_flags = 0; 84char** Arguments::_jvm_args_array = NULL; 85int Arguments::_num_jvm_args = 0; 86char* Arguments::_java_command = NULL; 87SystemProperty* Arguments::_system_properties = NULL; 88const char* Arguments::_gc_log_filename = NULL; 89bool Arguments::_has_profile = false; 90size_t Arguments::_conservative_max_heap_alignment = 0; 91uintx Arguments::_min_heap_size = 0; 92uintx Arguments::_min_heap_free_ratio = 0; 93uintx Arguments::_max_heap_free_ratio = 0; 94Arguments::Mode Arguments::_mode = _mixed; 95bool Arguments::_java_compiler = false; 96bool Arguments::_xdebug_mode = false; 97const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 98const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 99int Arguments::_sun_java_launcher_pid = -1; 100bool Arguments::_sun_java_launcher_is_altjvm = false; 101 102// These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 103bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 104bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 105bool Arguments::_BackgroundCompilation = BackgroundCompilation; 106bool Arguments::_ClipInlining = ClipInlining; 107 108char* Arguments::SharedArchivePath = NULL; 109 110AgentLibraryList Arguments::_libraryList; 111AgentLibraryList Arguments::_agentList; 112 113abort_hook_t Arguments::_abort_hook = NULL; 114exit_hook_t Arguments::_exit_hook = NULL; 115vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 116 117 118SystemProperty *Arguments::_java_ext_dirs = NULL; 119SystemProperty *Arguments::_java_endorsed_dirs = NULL; 120SystemProperty *Arguments::_sun_boot_library_path = NULL; 121SystemProperty *Arguments::_java_library_path = NULL; 122SystemProperty *Arguments::_java_home = NULL; 123SystemProperty *Arguments::_java_class_path = NULL; 124SystemProperty *Arguments::_sun_boot_class_path = NULL; 125 126char* Arguments::_meta_index_path = NULL; 127char* Arguments::_meta_index_dir = NULL; 128 129// Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 130 131static bool match_option(const JavaVMOption *option, const char* name, 132 const char** tail) { 133 int len = (int)strlen(name); 134 if (strncmp(option->optionString, name, len) == 0) { 135 *tail = option->optionString + len; 136 return true; 137 } else { 138 return false; 139 } 140} 141 142static void logOption(const char* opt) { 143 if (PrintVMOptions) { 144 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 145 } 146} 147 148// Process java launcher properties. 149void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 150 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 151 // sun.java.launcher.pid is defined. 152 // Must do this before setting up other system properties, 153 // as some of them may depend on launcher type. 154 for (int index = 0; index < args->nOptions; index++) { 155 const JavaVMOption* option = args->options + index; 156 const char* tail; 157 158 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 159 process_java_launcher_argument(tail, option->extraInfo); 160 continue; 161 } 162 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 163 if (strcmp(tail, "true") == 0) { 164 _sun_java_launcher_is_altjvm = true; 165 } 166 continue; 167 } 168 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 169 _sun_java_launcher_pid = atoi(tail); 170 continue; 171 } 172 } 173} 174 175// Initialize system properties key and value. 176void Arguments::init_system_properties() { 177 178 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 179 "Java Virtual Machine Specification", false)); 180 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 181 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 182 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 183 184 // Following are JVMTI agent writable properties. 185 // Properties values are set to NULL and they are 186 // os specific they are initialized in os::init_system_properties_values(). 187 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 188 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 189 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 190 _java_library_path = new SystemProperty("java.library.path", NULL, true); 191 _java_home = new SystemProperty("java.home", NULL, true); 192 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 193 194 _java_class_path = new SystemProperty("java.class.path", "", true); 195 196 // Add to System Property list. 197 PropertyList_add(&_system_properties, _java_ext_dirs); 198 PropertyList_add(&_system_properties, _java_endorsed_dirs); 199 PropertyList_add(&_system_properties, _sun_boot_library_path); 200 PropertyList_add(&_system_properties, _java_library_path); 201 PropertyList_add(&_system_properties, _java_home); 202 PropertyList_add(&_system_properties, _java_class_path); 203 PropertyList_add(&_system_properties, _sun_boot_class_path); 204 205 // Set OS specific system properties values 206 os::init_system_properties_values(); 207} 208 209 210 // Update/Initialize System properties after JDK version number is known 211void Arguments::init_version_specific_system_properties() { 212 enum { bufsz = 16 }; 213 char buffer[bufsz]; 214 const char* spec_vendor = "Sun Microsystems Inc."; 215 uint32_t spec_version = 0; 216 217 spec_vendor = "Oracle Corporation"; 218 spec_version = JDK_Version::current().major_version(); 219 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 220 221 PropertyList_add(&_system_properties, 222 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 223 PropertyList_add(&_system_properties, 224 new SystemProperty("java.vm.specification.version", buffer, false)); 225 PropertyList_add(&_system_properties, 226 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 227} 228 229/** 230 * Provide a slightly more user-friendly way of eliminating -XX flags. 231 * When a flag is eliminated, it can be added to this list in order to 232 * continue accepting this flag on the command-line, while issuing a warning 233 * and ignoring the value. Once the JDK version reaches the 'accept_until' 234 * limit, we flatly refuse to admit the existence of the flag. This allows 235 * a flag to die correctly over JDK releases using HSX. 236 */ 237typedef struct { 238 const char* name; 239 JDK_Version obsoleted_in; // when the flag went away 240 JDK_Version accept_until; // which version to start denying the existence 241} ObsoleteFlag; 242 243static ObsoleteFlag obsolete_jvm_flags[] = { 244 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 245 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 246 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 247 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 248 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 249 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 250 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 251 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 252 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 253 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 254 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 255 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 256 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 257 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 258 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 259 { "DefaultInitialRAMFraction", 260 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 261 { "UseDepthFirstScavengeOrder", 262 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 263 { "HandlePromotionFailure", 264 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 265 { "MaxLiveObjectEvacuationRatio", 266 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 267 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 268 { "UseParallelOldGCCompacting", 269 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 270 { "UseParallelDensePrefixUpdate", 271 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 272 { "UseParallelOldGCDensePrefix", 273 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 274 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 275 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 276 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 277 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 278 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 279 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 280 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 281 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 282 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 283 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 284 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 285 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 286 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 287 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 288 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 289 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 290 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 291 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 292 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 293 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 294 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 295 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 296#ifdef PRODUCT 297 { "DesiredMethodLimit", 298 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 299#endif // PRODUCT 300 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 301 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 302 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 303 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 304 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 305 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 306 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) }, 307 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 308 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 309 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 310 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 311 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 312#ifndef ZERO 313 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 314 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 315#endif // ZERO 316 { NULL, JDK_Version(0), JDK_Version(0) } 317}; 318 319// Returns true if the flag is obsolete and fits into the range specified 320// for being ignored. In the case that the flag is ignored, the 'version' 321// value is filled in with the version number when the flag became 322// obsolete so that that value can be displayed to the user. 323bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 324 int i = 0; 325 assert(version != NULL, "Must provide a version buffer"); 326 while (obsolete_jvm_flags[i].name != NULL) { 327 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 328 // <flag>=xxx form 329 // [-|+]<flag> form 330 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 331 ((s[0] == '+' || s[0] == '-') && 332 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 333 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 334 *version = flag_status.obsoleted_in; 335 return true; 336 } 337 } 338 i++; 339 } 340 return false; 341} 342 343// Constructs the system class path (aka boot class path) from the following 344// components, in order: 345// 346// prefix // from -Xbootclasspath/p:... 347// endorsed // the expansion of -Djava.endorsed.dirs=... 348// base // from os::get_system_properties() or -Xbootclasspath= 349// suffix // from -Xbootclasspath/a:... 350// 351// java.endorsed.dirs is a list of directories; any jar or zip files in the 352// directories are added to the sysclasspath just before the base. 353// 354// This could be AllStatic, but it isn't needed after argument processing is 355// complete. 356class SysClassPath: public StackObj { 357public: 358 SysClassPath(const char* base); 359 ~SysClassPath(); 360 361 inline void set_base(const char* base); 362 inline void add_prefix(const char* prefix); 363 inline void add_suffix_to_prefix(const char* suffix); 364 inline void add_suffix(const char* suffix); 365 inline void reset_path(const char* base); 366 367 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 368 // property. Must be called after all command-line arguments have been 369 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 370 // combined_path(). 371 void expand_endorsed(); 372 373 inline const char* get_base() const { return _items[_scp_base]; } 374 inline const char* get_prefix() const { return _items[_scp_prefix]; } 375 inline const char* get_suffix() const { return _items[_scp_suffix]; } 376 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 377 378 // Combine all the components into a single c-heap-allocated string; caller 379 // must free the string if/when no longer needed. 380 char* combined_path(); 381 382private: 383 // Utility routines. 384 static char* add_to_path(const char* path, const char* str, bool prepend); 385 static char* add_jars_to_path(char* path, const char* directory); 386 387 inline void reset_item_at(int index); 388 389 // Array indices for the items that make up the sysclasspath. All except the 390 // base are allocated in the C heap and freed by this class. 391 enum { 392 _scp_prefix, // from -Xbootclasspath/p:... 393 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 394 _scp_base, // the default sysclasspath 395 _scp_suffix, // from -Xbootclasspath/a:... 396 _scp_nitems // the number of items, must be last. 397 }; 398 399 const char* _items[_scp_nitems]; 400 DEBUG_ONLY(bool _expansion_done;) 401}; 402 403SysClassPath::SysClassPath(const char* base) { 404 memset(_items, 0, sizeof(_items)); 405 _items[_scp_base] = base; 406 DEBUG_ONLY(_expansion_done = false;) 407} 408 409SysClassPath::~SysClassPath() { 410 // Free everything except the base. 411 for (int i = 0; i < _scp_nitems; ++i) { 412 if (i != _scp_base) reset_item_at(i); 413 } 414 DEBUG_ONLY(_expansion_done = false;) 415} 416 417inline void SysClassPath::set_base(const char* base) { 418 _items[_scp_base] = base; 419} 420 421inline void SysClassPath::add_prefix(const char* prefix) { 422 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 423} 424 425inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 426 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 427} 428 429inline void SysClassPath::add_suffix(const char* suffix) { 430 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 431} 432 433inline void SysClassPath::reset_item_at(int index) { 434 assert(index < _scp_nitems && index != _scp_base, "just checking"); 435 if (_items[index] != NULL) { 436 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 437 _items[index] = NULL; 438 } 439} 440 441inline void SysClassPath::reset_path(const char* base) { 442 // Clear the prefix and suffix. 443 reset_item_at(_scp_prefix); 444 reset_item_at(_scp_suffix); 445 set_base(base); 446} 447 448//------------------------------------------------------------------------------ 449 450void SysClassPath::expand_endorsed() { 451 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 452 453 const char* path = Arguments::get_property("java.endorsed.dirs"); 454 if (path == NULL) { 455 path = Arguments::get_endorsed_dir(); 456 assert(path != NULL, "no default for java.endorsed.dirs"); 457 } 458 459 char* expanded_path = NULL; 460 const char separator = *os::path_separator(); 461 const char* const end = path + strlen(path); 462 while (path < end) { 463 const char* tmp_end = strchr(path, separator); 464 if (tmp_end == NULL) { 465 expanded_path = add_jars_to_path(expanded_path, path); 466 path = end; 467 } else { 468 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 469 memcpy(dirpath, path, tmp_end - path); 470 dirpath[tmp_end - path] = '\0'; 471 expanded_path = add_jars_to_path(expanded_path, dirpath); 472 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 473 path = tmp_end + 1; 474 } 475 } 476 _items[_scp_endorsed] = expanded_path; 477 DEBUG_ONLY(_expansion_done = true;) 478} 479 480// Combine the bootclasspath elements, some of which may be null, into a single 481// c-heap-allocated string. 482char* SysClassPath::combined_path() { 483 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 484 assert(_expansion_done, "must call expand_endorsed() first."); 485 486 size_t lengths[_scp_nitems]; 487 size_t total_len = 0; 488 489 const char separator = *os::path_separator(); 490 491 // Get the lengths. 492 int i; 493 for (i = 0; i < _scp_nitems; ++i) { 494 if (_items[i] != NULL) { 495 lengths[i] = strlen(_items[i]); 496 // Include space for the separator char (or a NULL for the last item). 497 total_len += lengths[i] + 1; 498 } 499 } 500 assert(total_len > 0, "empty sysclasspath not allowed"); 501 502 // Copy the _items to a single string. 503 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 504 char* cp_tmp = cp; 505 for (i = 0; i < _scp_nitems; ++i) { 506 if (_items[i] != NULL) { 507 memcpy(cp_tmp, _items[i], lengths[i]); 508 cp_tmp += lengths[i]; 509 *cp_tmp++ = separator; 510 } 511 } 512 *--cp_tmp = '\0'; // Replace the extra separator. 513 return cp; 514} 515 516// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 517char* 518SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 519 char *cp; 520 521 assert(str != NULL, "just checking"); 522 if (path == NULL) { 523 size_t len = strlen(str) + 1; 524 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 525 memcpy(cp, str, len); // copy the trailing null 526 } else { 527 const char separator = *os::path_separator(); 528 size_t old_len = strlen(path); 529 size_t str_len = strlen(str); 530 size_t len = old_len + str_len + 2; 531 532 if (prepend) { 533 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 534 char* cp_tmp = cp; 535 memcpy(cp_tmp, str, str_len); 536 cp_tmp += str_len; 537 *cp_tmp = separator; 538 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 539 FREE_C_HEAP_ARRAY(char, path, mtInternal); 540 } else { 541 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 542 char* cp_tmp = cp + old_len; 543 *cp_tmp = separator; 544 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 545 } 546 } 547 return cp; 548} 549 550// Scan the directory and append any jar or zip files found to path. 551// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 552char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 553 DIR* dir = os::opendir(directory); 554 if (dir == NULL) return path; 555 556 char dir_sep[2] = { '\0', '\0' }; 557 size_t directory_len = strlen(directory); 558 const char fileSep = *os::file_separator(); 559 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 560 561 /* Scan the directory for jars/zips, appending them to path. */ 562 struct dirent *entry; 563 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 564 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 565 const char* name = entry->d_name; 566 const char* ext = name + strlen(name) - 4; 567 bool isJarOrZip = ext > name && 568 (os::file_name_strcmp(ext, ".jar") == 0 || 569 os::file_name_strcmp(ext, ".zip") == 0); 570 if (isJarOrZip) { 571 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 572 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 573 path = add_to_path(path, jarpath, false); 574 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 575 } 576 } 577 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 578 os::closedir(dir); 579 return path; 580} 581 582// Parses a memory size specification string. 583static bool atomull(const char *s, julong* result) { 584 julong n = 0; 585 int args_read = 0; 586 bool is_hex = false; 587 // Skip leading 0[xX] for hexadecimal 588 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) { 589 s += 2; 590 is_hex = true; 591 args_read = sscanf(s, JULONG_FORMAT_X, &n); 592 } else { 593 args_read = sscanf(s, JULONG_FORMAT, &n); 594 } 595 if (args_read != 1) { 596 return false; 597 } 598 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) { 599 s++; 600 } 601 // 4705540: illegal if more characters are found after the first non-digit 602 if (strlen(s) > 1) { 603 return false; 604 } 605 switch (*s) { 606 case 'T': case 't': 607 *result = n * G * K; 608 // Check for overflow. 609 if (*result/((julong)G * K) != n) return false; 610 return true; 611 case 'G': case 'g': 612 *result = n * G; 613 if (*result/G != n) return false; 614 return true; 615 case 'M': case 'm': 616 *result = n * M; 617 if (*result/M != n) return false; 618 return true; 619 case 'K': case 'k': 620 *result = n * K; 621 if (*result/K != n) return false; 622 return true; 623 case '\0': 624 *result = n; 625 return true; 626 default: 627 return false; 628 } 629} 630 631Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 632 if (size < min_size) return arg_too_small; 633 // Check that size will fit in a size_t (only relevant on 32-bit) 634 if (size > max_uintx) return arg_too_big; 635 return arg_in_range; 636} 637 638// Describe an argument out of range error 639void Arguments::describe_range_error(ArgsRange errcode) { 640 switch(errcode) { 641 case arg_too_big: 642 jio_fprintf(defaultStream::error_stream(), 643 "The specified size exceeds the maximum " 644 "representable size.\n"); 645 break; 646 case arg_too_small: 647 case arg_unreadable: 648 case arg_in_range: 649 // do nothing for now 650 break; 651 default: 652 ShouldNotReachHere(); 653 } 654} 655 656static bool set_bool_flag(char* name, bool value, Flag::Flags origin) { 657 return CommandLineFlags::boolAtPut(name, &value, origin); 658} 659 660static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 661 double v; 662 if (sscanf(value, "%lf", &v) != 1) { 663 return false; 664 } 665 666 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 667 return true; 668 } 669 return false; 670} 671 672static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 673 julong v; 674 intx intx_v; 675 bool is_neg = false; 676 // Check the sign first since atomull() parses only unsigned values. 677 if (*value == '-') { 678 if (!CommandLineFlags::intxAt(name, &intx_v)) { 679 return false; 680 } 681 value++; 682 is_neg = true; 683 } 684 if (!atomull(value, &v)) { 685 return false; 686 } 687 intx_v = (intx) v; 688 if (is_neg) { 689 intx_v = -intx_v; 690 } 691 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 692 return true; 693 } 694 uintx uintx_v = (uintx) v; 695 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 696 return true; 697 } 698 uint64_t uint64_t_v = (uint64_t) v; 699 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 700 return true; 701 } 702 size_t size_t_v = (size_t) v; 703 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) { 704 return true; 705 } 706 return false; 707} 708 709static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 710 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 711 // Contract: CommandLineFlags always returns a pointer that needs freeing. 712 FREE_C_HEAP_ARRAY(char, value, mtInternal); 713 return true; 714} 715 716static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 717 const char* old_value = ""; 718 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 719 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 720 size_t new_len = strlen(new_value); 721 const char* value; 722 char* free_this_too = NULL; 723 if (old_len == 0) { 724 value = new_value; 725 } else if (new_len == 0) { 726 value = old_value; 727 } else { 728 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 729 // each new setting adds another LINE to the switch: 730 sprintf(buf, "%s\n%s", old_value, new_value); 731 value = buf; 732 free_this_too = buf; 733 } 734 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 735 // CommandLineFlags always returns a pointer that needs freeing. 736 FREE_C_HEAP_ARRAY(char, value, mtInternal); 737 if (free_this_too != NULL) { 738 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 739 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 740 } 741 return true; 742} 743 744bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 745 746 // range of acceptable characters spelled out for portability reasons 747#define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 748#define BUFLEN 255 749 char name[BUFLEN+1]; 750 char dummy; 751 752 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 753 return set_bool_flag(name, false, origin); 754 } 755 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 756 return set_bool_flag(name, true, origin); 757 } 758 759 char punct; 760 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 761 const char* value = strchr(arg, '=') + 1; 762 Flag* flag = Flag::find_flag(name, strlen(name)); 763 if (flag != NULL && flag->is_ccstr()) { 764 if (flag->ccstr_accumulates()) { 765 return append_to_string_flag(name, value, origin); 766 } else { 767 if (value[0] == '\0') { 768 value = NULL; 769 } 770 return set_string_flag(name, value, origin); 771 } 772 } 773 } 774 775 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 776 const char* value = strchr(arg, '=') + 1; 777 // -XX:Foo:=xxx will reset the string flag to the given value. 778 if (value[0] == '\0') { 779 value = NULL; 780 } 781 return set_string_flag(name, value, origin); 782 } 783 784#define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 785#define SIGNED_NUMBER_RANGE "[-0123456789]" 786#define NUMBER_RANGE "[0123456789]" 787 char value[BUFLEN + 1]; 788 char value2[BUFLEN + 1]; 789 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 790 // Looks like a floating-point number -- try again with more lenient format string 791 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 792 return set_fp_numeric_flag(name, value, origin); 793 } 794 } 795 796#define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 797 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 798 return set_numeric_flag(name, value, origin); 799 } 800 801 return false; 802} 803 804void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 805 assert(bldarray != NULL, "illegal argument"); 806 807 if (arg == NULL) { 808 return; 809 } 810 811 int new_count = *count + 1; 812 813 // expand the array and add arg to the last element 814 if (*bldarray == NULL) { 815 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 816 } else { 817 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 818 } 819 (*bldarray)[*count] = os::strdup_check_oom(arg); 820 *count = new_count; 821} 822 823void Arguments::build_jvm_args(const char* arg) { 824 add_string(&_jvm_args_array, &_num_jvm_args, arg); 825} 826 827void Arguments::build_jvm_flags(const char* arg) { 828 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 829} 830 831// utility function to return a string that concatenates all 832// strings in a given char** array 833const char* Arguments::build_resource_string(char** args, int count) { 834 if (args == NULL || count == 0) { 835 return NULL; 836 } 837 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 838 for (int i = 1; i < count; i++) { 839 length += strlen(args[i]) + 1; // add 1 for a space 840 } 841 char* s = NEW_RESOURCE_ARRAY(char, length); 842 strcpy(s, args[0]); 843 for (int j = 1; j < count; j++) { 844 strcat(s, " "); 845 strcat(s, args[j]); 846 } 847 return (const char*) s; 848} 849 850void Arguments::print_on(outputStream* st) { 851 st->print_cr("VM Arguments:"); 852 if (num_jvm_flags() > 0) { 853 st->print("jvm_flags: "); print_jvm_flags_on(st); 854 } 855 if (num_jvm_args() > 0) { 856 st->print("jvm_args: "); print_jvm_args_on(st); 857 } 858 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 859 if (_java_class_path != NULL) { 860 char* path = _java_class_path->value(); 861 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 862 } 863 st->print_cr("Launcher Type: %s", _sun_java_launcher); 864} 865 866void Arguments::print_jvm_flags_on(outputStream* st) { 867 if (_num_jvm_flags > 0) { 868 for (int i=0; i < _num_jvm_flags; i++) { 869 st->print("%s ", _jvm_flags_array[i]); 870 } 871 st->cr(); 872 } 873} 874 875void Arguments::print_jvm_args_on(outputStream* st) { 876 if (_num_jvm_args > 0) { 877 for (int i=0; i < _num_jvm_args; i++) { 878 st->print("%s ", _jvm_args_array[i]); 879 } 880 st->cr(); 881 } 882} 883 884bool Arguments::process_argument(const char* arg, 885 jboolean ignore_unrecognized, Flag::Flags origin) { 886 887 JDK_Version since = JDK_Version(); 888 889 if (parse_argument(arg, origin) || ignore_unrecognized) { 890 return true; 891 } 892 893 bool has_plus_minus = (*arg == '+' || *arg == '-'); 894 const char* const argname = has_plus_minus ? arg + 1 : arg; 895 if (is_newly_obsolete(arg, &since)) { 896 char version[256]; 897 since.to_string(version, sizeof(version)); 898 warning("ignoring option %s; support was removed in %s", argname, version); 899 return true; 900 } 901 902 // For locked flags, report a custom error message if available. 903 // Otherwise, report the standard unrecognized VM option. 904 905 size_t arg_len; 906 const char* equal_sign = strchr(argname, '='); 907 if (equal_sign == NULL) { 908 arg_len = strlen(argname); 909 } else { 910 arg_len = equal_sign - argname; 911 } 912 913 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 914 if (found_flag != NULL) { 915 char locked_message_buf[BUFLEN]; 916 found_flag->get_locked_message(locked_message_buf, BUFLEN); 917 if (strlen(locked_message_buf) == 0) { 918 if (found_flag->is_bool() && !has_plus_minus) { 919 jio_fprintf(defaultStream::error_stream(), 920 "Missing +/- setting for VM option '%s'\n", argname); 921 } else if (!found_flag->is_bool() && has_plus_minus) { 922 jio_fprintf(defaultStream::error_stream(), 923 "Unexpected +/- setting in VM option '%s'\n", argname); 924 } else { 925 jio_fprintf(defaultStream::error_stream(), 926 "Improperly specified VM option '%s'\n", argname); 927 } 928 } else { 929 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 930 } 931 } else { 932 jio_fprintf(defaultStream::error_stream(), 933 "Unrecognized VM option '%s'\n", argname); 934 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 935 if (fuzzy_matched != NULL) { 936 jio_fprintf(defaultStream::error_stream(), 937 "Did you mean '%s%s%s'?\n", 938 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 939 fuzzy_matched->_name, 940 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 941 } 942 } 943 944 // allow for commandline "commenting out" options like -XX:#+Verbose 945 return arg[0] == '#'; 946} 947 948bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 949 FILE* stream = fopen(file_name, "rb"); 950 if (stream == NULL) { 951 if (should_exist) { 952 jio_fprintf(defaultStream::error_stream(), 953 "Could not open settings file %s\n", file_name); 954 return false; 955 } else { 956 return true; 957 } 958 } 959 960 char token[1024]; 961 int pos = 0; 962 963 bool in_white_space = true; 964 bool in_comment = false; 965 bool in_quote = false; 966 char quote_c = 0; 967 bool result = true; 968 969 int c = getc(stream); 970 while(c != EOF && pos < (int)(sizeof(token)-1)) { 971 if (in_white_space) { 972 if (in_comment) { 973 if (c == '\n') in_comment = false; 974 } else { 975 if (c == '#') in_comment = true; 976 else if (!isspace(c)) { 977 in_white_space = false; 978 token[pos++] = c; 979 } 980 } 981 } else { 982 if (c == '\n' || (!in_quote && isspace(c))) { 983 // token ends at newline, or at unquoted whitespace 984 // this allows a way to include spaces in string-valued options 985 token[pos] = '\0'; 986 logOption(token); 987 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 988 build_jvm_flags(token); 989 pos = 0; 990 in_white_space = true; 991 in_quote = false; 992 } else if (!in_quote && (c == '\'' || c == '"')) { 993 in_quote = true; 994 quote_c = c; 995 } else if (in_quote && (c == quote_c)) { 996 in_quote = false; 997 } else { 998 token[pos++] = c; 999 } 1000 } 1001 c = getc(stream); 1002 } 1003 if (pos > 0) { 1004 token[pos] = '\0'; 1005 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1006 build_jvm_flags(token); 1007 } 1008 fclose(stream); 1009 return result; 1010} 1011 1012//============================================================================================================= 1013// Parsing of properties (-D) 1014 1015const char* Arguments::get_property(const char* key) { 1016 return PropertyList_get_value(system_properties(), key); 1017} 1018 1019bool Arguments::add_property(const char* prop) { 1020 const char* eq = strchr(prop, '='); 1021 char* key; 1022 // ns must be static--its address may be stored in a SystemProperty object. 1023 const static char ns[1] = {0}; 1024 char* value = (char *)ns; 1025 1026 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 1027 key = AllocateHeap(key_len + 1, mtInternal); 1028 strncpy(key, prop, key_len); 1029 key[key_len] = '\0'; 1030 1031 if (eq != NULL) { 1032 size_t value_len = strlen(prop) - key_len - 1; 1033 value = AllocateHeap(value_len + 1, mtInternal); 1034 strncpy(value, &prop[key_len + 1], value_len + 1); 1035 } 1036 1037 if (strcmp(key, "java.compiler") == 0) { 1038 process_java_compiler_argument(value); 1039 FreeHeap(key); 1040 if (eq != NULL) { 1041 FreeHeap(value); 1042 } 1043 return true; 1044 } else if (strcmp(key, "sun.java.command") == 0) { 1045 _java_command = value; 1046 1047 // Record value in Arguments, but let it get passed to Java. 1048 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1049 strcmp(key, "sun.java.launcher.pid") == 0) { 1050 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1051 // private and are processed in process_sun_java_launcher_properties(); 1052 // the sun.java.launcher property is passed on to the java application 1053 FreeHeap(key); 1054 if (eq != NULL) { 1055 FreeHeap(value); 1056 } 1057 return true; 1058 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1059 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1060 // its value without going through the property list or making a Java call. 1061 _java_vendor_url_bug = value; 1062 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1063 PropertyList_unique_add(&_system_properties, key, value, true); 1064 return true; 1065 } 1066 // Create new property and add at the end of the list 1067 PropertyList_unique_add(&_system_properties, key, value); 1068 return true; 1069} 1070 1071//=========================================================================================================== 1072// Setting int/mixed/comp mode flags 1073 1074void Arguments::set_mode_flags(Mode mode) { 1075 // Set up default values for all flags. 1076 // If you add a flag to any of the branches below, 1077 // add a default value for it here. 1078 set_java_compiler(false); 1079 _mode = mode; 1080 1081 // Ensure Agent_OnLoad has the correct initial values. 1082 // This may not be the final mode; mode may change later in onload phase. 1083 PropertyList_unique_add(&_system_properties, "java.vm.info", 1084 (char*)VM_Version::vm_info_string(), false); 1085 1086 UseInterpreter = true; 1087 UseCompiler = true; 1088 UseLoopCounter = true; 1089 1090 // Default values may be platform/compiler dependent - 1091 // use the saved values 1092 ClipInlining = Arguments::_ClipInlining; 1093 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1094 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1095 BackgroundCompilation = Arguments::_BackgroundCompilation; 1096 1097 // Change from defaults based on mode 1098 switch (mode) { 1099 default: 1100 ShouldNotReachHere(); 1101 break; 1102 case _int: 1103 UseCompiler = false; 1104 UseLoopCounter = false; 1105 AlwaysCompileLoopMethods = false; 1106 UseOnStackReplacement = false; 1107 break; 1108 case _mixed: 1109 // same as default 1110 break; 1111 case _comp: 1112 UseInterpreter = false; 1113 BackgroundCompilation = false; 1114 ClipInlining = false; 1115 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1116 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1117 // compile a level 4 (C2) and then continue executing it. 1118 if (TieredCompilation) { 1119 Tier3InvokeNotifyFreqLog = 0; 1120 Tier4InvocationThreshold = 0; 1121 } 1122 break; 1123 } 1124} 1125 1126#if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1127// Conflict: required to use shared spaces (-Xshare:on), but 1128// incompatible command line options were chosen. 1129 1130static void no_shared_spaces(const char* message) { 1131 if (RequireSharedSpaces) { 1132 jio_fprintf(defaultStream::error_stream(), 1133 "Class data sharing is inconsistent with other specified options.\n"); 1134 vm_exit_during_initialization("Unable to use shared archive.", message); 1135 } else { 1136 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1137 } 1138} 1139#endif 1140 1141// Returns threshold scaled with CompileThresholdScaling 1142intx Arguments::get_scaled_compile_threshold(intx threshold) { 1143 return (intx)(threshold * CompileThresholdScaling); 1144} 1145 1146// Returns freq_log scaled with CompileThresholdScaling 1147intx Arguments::get_scaled_freq_log(intx freq_log) { 1148 intx scaled_freq = get_scaled_compile_threshold((intx)1 << freq_log); 1149 if (scaled_freq == 0) { 1150 return 0; 1151 } else { 1152 return log2_intptr(scaled_freq); 1153 } 1154} 1155 1156void Arguments::set_tiered_flags() { 1157 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1158 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1159 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1160 } 1161 if (CompilationPolicyChoice < 2) { 1162 vm_exit_during_initialization( 1163 "Incompatible compilation policy selected", NULL); 1164 } 1165 // Increase the code cache size - tiered compiles a lot more. 1166 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1167 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1168 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1169 } 1170 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1171 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1172 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1173 1174 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1175 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap) 1176 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) { 1177 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1178 } 1179 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) { 1180 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1181 } 1182 // Check consistency of code heap sizes 1183 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 1184 jio_fprintf(defaultStream::error_stream(), 1185 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 1186 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 1187 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 1188 vm_exit(1); 1189 } 1190 } 1191 } 1192 if (!UseInterpreter) { // -Xcomp 1193 Tier3InvokeNotifyFreqLog = 0; 1194 Tier4InvocationThreshold = 0; 1195 } 1196 // Scale tiered compilation thresholds 1197 if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) { 1198 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, get_scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1199 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, get_scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1200 1201 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, get_scaled_compile_threshold(Tier3InvocationThreshold)); 1202 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, get_scaled_compile_threshold(Tier3MinInvocationThreshold)); 1203 FLAG_SET_ERGO(intx, Tier3CompileThreshold, get_scaled_compile_threshold(Tier3CompileThreshold)); 1204 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, get_scaled_compile_threshold(Tier3BackEdgeThreshold)); 1205 1206 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1207 // once these thresholds become supported. 1208 1209 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, get_scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1210 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, get_scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1211 1212 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, get_scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1213 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, get_scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1214 1215 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, get_scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1216 1217 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, get_scaled_compile_threshold(Tier4InvocationThreshold)); 1218 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, get_scaled_compile_threshold(Tier4MinInvocationThreshold)); 1219 FLAG_SET_ERGO(intx, Tier4CompileThreshold, get_scaled_compile_threshold(Tier4CompileThreshold)); 1220 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, get_scaled_compile_threshold(Tier4BackEdgeThreshold)); 1221 } 1222} 1223 1224/** 1225 * Returns the minimum number of compiler threads needed to run the JVM. The following 1226 * configurations are possible. 1227 * 1228 * 1) The JVM is build using an interpreter only. As a result, the minimum number of 1229 * compiler threads is 0. 1230 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As 1231 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1. 1232 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However, 1233 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only 1234 * C1 can be used, so the minimum number of compiler threads is 1. 1235 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option 1236 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result, 1237 * the minimum number of compiler threads is 2. 1238 */ 1239int Arguments::get_min_number_of_compiler_threads() { 1240#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 1241 return 0; // case 1 1242#else 1243 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) { 1244 return 1; // case 2 or case 3 1245 } 1246 return 2; // case 4 (tiered) 1247#endif 1248} 1249 1250#if INCLUDE_ALL_GCS 1251static void disable_adaptive_size_policy(const char* collector_name) { 1252 if (UseAdaptiveSizePolicy) { 1253 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1254 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1255 collector_name); 1256 } 1257 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1258 } 1259} 1260 1261void Arguments::set_parnew_gc_flags() { 1262 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1263 "control point invariant"); 1264 assert(UseParNewGC, "Error"); 1265 1266 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1267 disable_adaptive_size_policy("UseParNewGC"); 1268 1269 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1270 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1271 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1272 } else if (ParallelGCThreads == 0) { 1273 jio_fprintf(defaultStream::error_stream(), 1274 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1275 vm_exit(1); 1276 } 1277 1278 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1279 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1280 // we set them to 1024 and 1024. 1281 // See CR 6362902. 1282 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1283 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1284 } 1285 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1286 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1287 } 1288 1289 // When using compressed oops, we use local overflow stacks, 1290 // rather than using a global overflow list chained through 1291 // the klass word of the object's pre-image. 1292 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1293 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1294 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1295 } 1296 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1297 } 1298 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1299} 1300 1301// Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1302// sparc/solaris for certain applications, but would gain from 1303// further optimization and tuning efforts, and would almost 1304// certainly gain from analysis of platform and environment. 1305void Arguments::set_cms_and_parnew_gc_flags() { 1306 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1307 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1308 1309 // If we are using CMS, we prefer to UseParNewGC, 1310 // unless explicitly forbidden. 1311 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1312 FLAG_SET_ERGO(bool, UseParNewGC, true); 1313 } 1314 1315 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1316 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1317 1318 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1319 // as needed. 1320 if (UseParNewGC) { 1321 set_parnew_gc_flags(); 1322 } 1323 1324 size_t max_heap = align_size_down(MaxHeapSize, 1325 CardTableRS::ct_max_alignment_constraint()); 1326 1327 // Now make adjustments for CMS 1328 intx tenuring_default = (intx)6; 1329 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1330 1331 // Preferred young gen size for "short" pauses: 1332 // upper bound depends on # of threads and NewRatio. 1333 const uintx parallel_gc_threads = 1334 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1335 const size_t preferred_max_new_size_unaligned = 1336 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1337 size_t preferred_max_new_size = 1338 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1339 1340 // Unless explicitly requested otherwise, size young gen 1341 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1342 1343 // If either MaxNewSize or NewRatio is set on the command line, 1344 // assume the user is trying to set the size of the young gen. 1345 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1346 1347 // Set MaxNewSize to our calculated preferred_max_new_size unless 1348 // NewSize was set on the command line and it is larger than 1349 // preferred_max_new_size. 1350 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1351 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1352 } else { 1353 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1354 } 1355 if (PrintGCDetails && Verbose) { 1356 // Too early to use gclog_or_tty 1357 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1358 } 1359 1360 // Code along this path potentially sets NewSize and OldSize 1361 if (PrintGCDetails && Verbose) { 1362 // Too early to use gclog_or_tty 1363 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1364 " initial_heap_size: " SIZE_FORMAT 1365 " max_heap: " SIZE_FORMAT, 1366 min_heap_size(), InitialHeapSize, max_heap); 1367 } 1368 size_t min_new = preferred_max_new_size; 1369 if (FLAG_IS_CMDLINE(NewSize)) { 1370 min_new = NewSize; 1371 } 1372 if (max_heap > min_new && min_heap_size() > min_new) { 1373 // Unless explicitly requested otherwise, make young gen 1374 // at least min_new, and at most preferred_max_new_size. 1375 if (FLAG_IS_DEFAULT(NewSize)) { 1376 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1377 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1378 if (PrintGCDetails && Verbose) { 1379 // Too early to use gclog_or_tty 1380 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1381 } 1382 } 1383 // Unless explicitly requested otherwise, size old gen 1384 // so it's NewRatio x of NewSize. 1385 if (FLAG_IS_DEFAULT(OldSize)) { 1386 if (max_heap > NewSize) { 1387 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1388 if (PrintGCDetails && Verbose) { 1389 // Too early to use gclog_or_tty 1390 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1391 } 1392 } 1393 } 1394 } 1395 } 1396 // Unless explicitly requested otherwise, definitely 1397 // promote all objects surviving "tenuring_default" scavenges. 1398 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1399 FLAG_IS_DEFAULT(SurvivorRatio)) { 1400 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1401 } 1402 // If we decided above (or user explicitly requested) 1403 // `promote all' (via MaxTenuringThreshold := 0), 1404 // prefer minuscule survivor spaces so as not to waste 1405 // space for (non-existent) survivors 1406 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1407 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1408 } 1409 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1410 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1411 // This is done in order to make ParNew+CMS configuration to work 1412 // with YoungPLABSize and OldPLABSize options. 1413 // See CR 6362902. 1414 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1415 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1416 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1417 // is. In this situation let CMSParPromoteBlocksToClaim follow 1418 // the value (either from the command line or ergonomics) of 1419 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1420 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1421 } else { 1422 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1423 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1424 // we'll let it to take precedence. 1425 jio_fprintf(defaultStream::error_stream(), 1426 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1427 " options are specified for the CMS collector." 1428 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1429 } 1430 } 1431 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1432 // OldPLAB sizing manually turned off: Use a larger default setting, 1433 // unless it was manually specified. This is because a too-low value 1434 // will slow down scavenges. 1435 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1436 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1437 } 1438 } 1439 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1440 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1441 // If either of the static initialization defaults have changed, note this 1442 // modification. 1443 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1444 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1445 } 1446 if (PrintGCDetails && Verbose) { 1447 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1448 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1449 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1450 } 1451} 1452#endif // INCLUDE_ALL_GCS 1453 1454void set_object_alignment() { 1455 // Object alignment. 1456 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1457 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1458 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1459 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1460 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1461 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1462 1463 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1464 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1465 1466 // Oop encoding heap max 1467 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1468 1469#if INCLUDE_ALL_GCS 1470 // Set CMS global values 1471 CompactibleFreeListSpace::set_cms_values(); 1472#endif // INCLUDE_ALL_GCS 1473} 1474 1475bool verify_object_alignment() { 1476 // Object alignment. 1477 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1478 jio_fprintf(defaultStream::error_stream(), 1479 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1480 (int)ObjectAlignmentInBytes); 1481 return false; 1482 } 1483 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1484 jio_fprintf(defaultStream::error_stream(), 1485 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1486 (int)ObjectAlignmentInBytes, BytesPerLong); 1487 return false; 1488 } 1489 // It does not make sense to have big object alignment 1490 // since a space lost due to alignment will be greater 1491 // then a saved space from compressed oops. 1492 if ((int)ObjectAlignmentInBytes > 256) { 1493 jio_fprintf(defaultStream::error_stream(), 1494 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1495 (int)ObjectAlignmentInBytes); 1496 return false; 1497 } 1498 // In case page size is very small. 1499 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1500 jio_fprintf(defaultStream::error_stream(), 1501 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1502 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1503 return false; 1504 } 1505 if(SurvivorAlignmentInBytes == 0) { 1506 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1507 } else { 1508 if (!is_power_of_2(SurvivorAlignmentInBytes)) { 1509 jio_fprintf(defaultStream::error_stream(), 1510 "error: SurvivorAlignmentInBytes=%d must be power of 2\n", 1511 (int)SurvivorAlignmentInBytes); 1512 return false; 1513 } 1514 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) { 1515 jio_fprintf(defaultStream::error_stream(), 1516 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n", 1517 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes); 1518 return false; 1519 } 1520 } 1521 return true; 1522} 1523 1524size_t Arguments::max_heap_for_compressed_oops() { 1525 // Avoid sign flip. 1526 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1527 // We need to fit both the NULL page and the heap into the memory budget, while 1528 // keeping alignment constraints of the heap. To guarantee the latter, as the 1529 // NULL page is located before the heap, we pad the NULL page to the conservative 1530 // maximum alignment that the GC may ever impose upon the heap. 1531 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1532 _conservative_max_heap_alignment); 1533 1534 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1535 NOT_LP64(ShouldNotReachHere(); return 0); 1536} 1537 1538bool Arguments::should_auto_select_low_pause_collector() { 1539 if (UseAutoGCSelectPolicy && 1540 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1541 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1542 if (PrintGCDetails) { 1543 // Cannot use gclog_or_tty yet. 1544 tty->print_cr("Automatic selection of the low pause collector" 1545 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1546 } 1547 return true; 1548 } 1549 return false; 1550} 1551 1552void Arguments::set_use_compressed_oops() { 1553#ifndef ZERO 1554#ifdef _LP64 1555 // MaxHeapSize is not set up properly at this point, but 1556 // the only value that can override MaxHeapSize if we are 1557 // to use UseCompressedOops is InitialHeapSize. 1558 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1559 1560 if (max_heap_size <= max_heap_for_compressed_oops()) { 1561#if !defined(COMPILER1) || defined(TIERED) 1562 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1563 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1564 } 1565#endif 1566#ifdef _WIN64 1567 if (UseLargePages && UseCompressedOops) { 1568 // Cannot allocate guard pages for implicit checks in indexed addressing 1569 // mode, when large pages are specified on windows. 1570 // This flag could be switched ON if narrow oop base address is set to 0, 1571 // see code in Universe::initialize_heap(). 1572 Universe::set_narrow_oop_use_implicit_null_checks(false); 1573 } 1574#endif // _WIN64 1575 } else { 1576 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1577 warning("Max heap size too large for Compressed Oops"); 1578 FLAG_SET_DEFAULT(UseCompressedOops, false); 1579 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1580 } 1581 } 1582#endif // _LP64 1583#endif // ZERO 1584} 1585 1586 1587// NOTE: set_use_compressed_klass_ptrs() must be called after calling 1588// set_use_compressed_oops(). 1589void Arguments::set_use_compressed_klass_ptrs() { 1590#ifndef ZERO 1591#ifdef _LP64 1592 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1593 if (!UseCompressedOops) { 1594 if (UseCompressedClassPointers) { 1595 warning("UseCompressedClassPointers requires UseCompressedOops"); 1596 } 1597 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1598 } else { 1599 // Turn on UseCompressedClassPointers too 1600 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1601 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1602 } 1603 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1604 if (UseCompressedClassPointers) { 1605 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1606 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1607 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1608 } 1609 } 1610 } 1611#endif // _LP64 1612#endif // !ZERO 1613} 1614 1615void Arguments::set_conservative_max_heap_alignment() { 1616 // The conservative maximum required alignment for the heap is the maximum of 1617 // the alignments imposed by several sources: any requirements from the heap 1618 // itself, the collector policy and the maximum page size we may run the VM 1619 // with. 1620 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1621#if INCLUDE_ALL_GCS 1622 if (UseParallelGC) { 1623 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1624 } else if (UseG1GC) { 1625 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1626 } 1627#endif // INCLUDE_ALL_GCS 1628 _conservative_max_heap_alignment = MAX4(heap_alignment, 1629 (size_t)os::vm_allocation_granularity(), 1630 os::max_page_size(), 1631 CollectorPolicy::compute_heap_alignment()); 1632} 1633 1634void Arguments::select_gc_ergonomically() { 1635 if (os::is_server_class_machine()) { 1636 if (should_auto_select_low_pause_collector()) { 1637 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1638 } else { 1639 FLAG_SET_ERGO(bool, UseParallelGC, true); 1640 } 1641 } 1642} 1643 1644void Arguments::select_gc() { 1645 if (!gc_selected()) { 1646 ArgumentsExt::select_gc_ergonomically(); 1647 } 1648} 1649 1650void Arguments::set_ergonomics_flags() { 1651 select_gc(); 1652 1653#ifdef COMPILER2 1654 // Shared spaces work fine with other GCs but causes bytecode rewriting 1655 // to be disabled, which hurts interpreter performance and decreases 1656 // server performance. When -server is specified, keep the default off 1657 // unless it is asked for. Future work: either add bytecode rewriting 1658 // at link time, or rewrite bytecodes in non-shared methods. 1659 if (!DumpSharedSpaces && !RequireSharedSpaces && 1660 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1661 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1662 } 1663#endif 1664 1665 set_conservative_max_heap_alignment(); 1666 1667#ifndef ZERO 1668#ifdef _LP64 1669 set_use_compressed_oops(); 1670 1671 // set_use_compressed_klass_ptrs() must be called after calling 1672 // set_use_compressed_oops(). 1673 set_use_compressed_klass_ptrs(); 1674 1675 // Also checks that certain machines are slower with compressed oops 1676 // in vm_version initialization code. 1677#endif // _LP64 1678#endif // !ZERO 1679} 1680 1681void Arguments::set_parallel_gc_flags() { 1682 assert(UseParallelGC || UseParallelOldGC, "Error"); 1683 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1684 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1685 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1686 } 1687 FLAG_SET_DEFAULT(UseParallelGC, true); 1688 1689 // If no heap maximum was requested explicitly, use some reasonable fraction 1690 // of the physical memory, up to a maximum of 1GB. 1691 FLAG_SET_DEFAULT(ParallelGCThreads, 1692 Abstract_VM_Version::parallel_worker_threads()); 1693 if (ParallelGCThreads == 0) { 1694 jio_fprintf(defaultStream::error_stream(), 1695 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1696 vm_exit(1); 1697 } 1698 1699 if (UseAdaptiveSizePolicy) { 1700 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1701 // unless the user actually sets these flags. 1702 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1703 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1704 _min_heap_free_ratio = MinHeapFreeRatio; 1705 } 1706 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1707 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1708 _max_heap_free_ratio = MaxHeapFreeRatio; 1709 } 1710 } 1711 1712 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1713 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1714 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1715 // See CR 6362902 for details. 1716 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1717 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1718 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1719 } 1720 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1721 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1722 } 1723 } 1724 1725 if (UseParallelOldGC) { 1726 // Par compact uses lower default values since they are treated as 1727 // minimums. These are different defaults because of the different 1728 // interpretation and are not ergonomically set. 1729 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1730 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1731 } 1732 } 1733} 1734 1735void Arguments::set_g1_gc_flags() { 1736 assert(UseG1GC, "Error"); 1737#ifdef COMPILER1 1738 FastTLABRefill = false; 1739#endif 1740 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1741 if (ParallelGCThreads == 0) { 1742 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1743 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1744 } 1745 1746#if INCLUDE_ALL_GCS 1747 if (G1ConcRefinementThreads == 0) { 1748 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads); 1749 } 1750#endif 1751 1752 // MarkStackSize will be set (if it hasn't been set by the user) 1753 // when concurrent marking is initialized. 1754 // Its value will be based upon the number of parallel marking threads. 1755 // But we do set the maximum mark stack size here. 1756 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1757 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1758 } 1759 1760 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1761 // In G1, we want the default GC overhead goal to be higher than 1762 // say in PS. So we set it here to 10%. Otherwise the heap might 1763 // be expanded more aggressively than we would like it to. In 1764 // fact, even 10% seems to not be high enough in some cases 1765 // (especially small GC stress tests that the main thing they do 1766 // is allocation). We might consider increase it further. 1767 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1768 } 1769 1770 if (PrintGCDetails && Verbose) { 1771 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1772 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1773 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1774 } 1775} 1776 1777#if !INCLUDE_ALL_GCS 1778#ifdef ASSERT 1779static bool verify_serial_gc_flags() { 1780 return (UseSerialGC && 1781 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC || 1782 UseParallelGC || UseParallelOldGC)); 1783} 1784#endif // ASSERT 1785#endif // INCLUDE_ALL_GCS 1786 1787void Arguments::set_gc_specific_flags() { 1788#if INCLUDE_ALL_GCS 1789 // Set per-collector flags 1790 if (UseParallelGC || UseParallelOldGC) { 1791 set_parallel_gc_flags(); 1792 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below 1793 set_cms_and_parnew_gc_flags(); 1794 } else if (UseParNewGC) { // Skipped if CMS is set above 1795 set_parnew_gc_flags(); 1796 } else if (UseG1GC) { 1797 set_g1_gc_flags(); 1798 } 1799 check_deprecated_gcs(); 1800 check_deprecated_gc_flags(); 1801 if (AssumeMP && !UseSerialGC) { 1802 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 1803 warning("If the number of processors is expected to increase from one, then" 1804 " you should configure the number of parallel GC threads appropriately" 1805 " using -XX:ParallelGCThreads=N"); 1806 } 1807 } 1808 if (MinHeapFreeRatio == 100) { 1809 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1810 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 1811 } 1812#else // INCLUDE_ALL_GCS 1813 assert(verify_serial_gc_flags(), "SerialGC unset"); 1814#endif // INCLUDE_ALL_GCS 1815} 1816 1817julong Arguments::limit_by_allocatable_memory(julong limit) { 1818 julong max_allocatable; 1819 julong result = limit; 1820 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1821 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1822 } 1823 return result; 1824} 1825 1826// Use static initialization to get the default before parsing 1827static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1828 1829void Arguments::set_heap_size() { 1830 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1831 // Deprecated flag 1832 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1833 } 1834 1835 const julong phys_mem = 1836 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1837 : (julong)MaxRAM; 1838 1839 // If the maximum heap size has not been set with -Xmx, 1840 // then set it as fraction of the size of physical memory, 1841 // respecting the maximum and minimum sizes of the heap. 1842 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1843 julong reasonable_max = phys_mem / MaxRAMFraction; 1844 1845 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1846 // Small physical memory, so use a minimum fraction of it for the heap 1847 reasonable_max = phys_mem / MinRAMFraction; 1848 } else { 1849 // Not-small physical memory, so require a heap at least 1850 // as large as MaxHeapSize 1851 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1852 } 1853 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1854 // Limit the heap size to ErgoHeapSizeLimit 1855 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1856 } 1857 if (UseCompressedOops) { 1858 // Limit the heap size to the maximum possible when using compressed oops 1859 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1860 1861 // HeapBaseMinAddress can be greater than default but not less than. 1862 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1863 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1864 // matches compressed oops printing flags 1865 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 1866 jio_fprintf(defaultStream::error_stream(), 1867 "HeapBaseMinAddress must be at least " UINTX_FORMAT 1868 " (" UINTX_FORMAT "G) which is greater than value given " 1869 UINTX_FORMAT "\n", 1870 DefaultHeapBaseMinAddress, 1871 DefaultHeapBaseMinAddress/G, 1872 HeapBaseMinAddress); 1873 } 1874 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1875 } 1876 } 1877 1878 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1879 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1880 // but it should be not less than default MaxHeapSize. 1881 max_coop_heap -= HeapBaseMinAddress; 1882 } 1883 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1884 } 1885 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1886 1887 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1888 // An initial heap size was specified on the command line, 1889 // so be sure that the maximum size is consistent. Done 1890 // after call to limit_by_allocatable_memory because that 1891 // method might reduce the allocation size. 1892 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1893 } 1894 1895 if (PrintGCDetails && Verbose) { 1896 // Cannot use gclog_or_tty yet. 1897 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1898 } 1899 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1900 } 1901 1902 // If the minimum or initial heap_size have not been set or requested to be set 1903 // ergonomically, set them accordingly. 1904 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1905 julong reasonable_minimum = (julong)(OldSize + NewSize); 1906 1907 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1908 1909 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1910 1911 if (InitialHeapSize == 0) { 1912 julong reasonable_initial = phys_mem / InitialRAMFraction; 1913 1914 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1915 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1916 1917 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1918 1919 if (PrintGCDetails && Verbose) { 1920 // Cannot use gclog_or_tty yet. 1921 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1922 } 1923 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1924 } 1925 // If the minimum heap size has not been set (via -Xms), 1926 // synchronize with InitialHeapSize to avoid errors with the default value. 1927 if (min_heap_size() == 0) { 1928 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1929 if (PrintGCDetails && Verbose) { 1930 // Cannot use gclog_or_tty yet. 1931 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1932 } 1933 } 1934 } 1935} 1936 1937// This must be called after ergonomics because we want bytecode rewriting 1938// if the server compiler is used, or if UseSharedSpaces is disabled. 1939void Arguments::set_bytecode_flags() { 1940 // Better not attempt to store into a read-only space. 1941 if (UseSharedSpaces) { 1942 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1943 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1944 } 1945 1946 if (!RewriteBytecodes) { 1947 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1948 } 1949} 1950 1951// Aggressive optimization flags -XX:+AggressiveOpts 1952void Arguments::set_aggressive_opts_flags() { 1953#ifdef COMPILER2 1954 if (AggressiveUnboxing) { 1955 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1956 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1957 } else if (!EliminateAutoBox) { 1958 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1959 AggressiveUnboxing = false; 1960 } 1961 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1962 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1963 } else if (!DoEscapeAnalysis) { 1964 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1965 AggressiveUnboxing = false; 1966 } 1967 } 1968 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1969 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1970 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1971 } 1972 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1973 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1974 } 1975 1976 // Feed the cache size setting into the JDK 1977 char buffer[1024]; 1978 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1979 add_property(buffer); 1980 } 1981 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1982 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1983 } 1984#endif 1985 1986 if (AggressiveOpts) { 1987// Sample flag setting code 1988// if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1989// FLAG_SET_DEFAULT(EliminateZeroing, true); 1990// } 1991 } 1992} 1993 1994//=========================================================================================================== 1995// Parsing of java.compiler property 1996 1997void Arguments::process_java_compiler_argument(char* arg) { 1998 // For backwards compatibility, Djava.compiler=NONE or "" 1999 // causes us to switch to -Xint mode UNLESS -Xdebug 2000 // is also specified. 2001 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2002 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2003 } 2004} 2005 2006void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2007 _sun_java_launcher = os::strdup_check_oom(launcher); 2008} 2009 2010bool Arguments::created_by_java_launcher() { 2011 assert(_sun_java_launcher != NULL, "property must have value"); 2012 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2013} 2014 2015bool Arguments::sun_java_launcher_is_altjvm() { 2016 return _sun_java_launcher_is_altjvm; 2017} 2018 2019//=========================================================================================================== 2020// Parsing of main arguments 2021 2022bool Arguments::verify_interval(uintx val, uintx min, 2023 uintx max, const char* name) { 2024 // Returns true iff value is in the inclusive interval [min..max] 2025 // false, otherwise. 2026 if (val >= min && val <= max) { 2027 return true; 2028 } 2029 jio_fprintf(defaultStream::error_stream(), 2030 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 2031 " and " UINTX_FORMAT "\n", 2032 name, val, min, max); 2033 return false; 2034} 2035 2036bool Arguments::verify_min_value(intx val, intx min, const char* name) { 2037 // Returns true if given value is at least specified min threshold 2038 // false, otherwise. 2039 if (val >= min ) { 2040 return true; 2041 } 2042 jio_fprintf(defaultStream::error_stream(), 2043 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 2044 name, val, min); 2045 return false; 2046} 2047 2048bool Arguments::verify_percentage(uintx value, const char* name) { 2049 if (is_percentage(value)) { 2050 return true; 2051 } 2052 jio_fprintf(defaultStream::error_stream(), 2053 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 2054 name, value); 2055 return false; 2056} 2057 2058// check if do gclog rotation 2059// +UseGCLogFileRotation is a must, 2060// no gc log rotation when log file not supplied or 2061// NumberOfGCLogFiles is 0 2062void check_gclog_consistency() { 2063 if (UseGCLogFileRotation) { 2064 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { 2065 jio_fprintf(defaultStream::output_stream(), 2066 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" 2067 "where num_of_file > 0\n" 2068 "GC log rotation is turned off\n"); 2069 UseGCLogFileRotation = false; 2070 } 2071 } 2072 2073 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { 2074 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 2075 jio_fprintf(defaultStream::output_stream(), 2076 "GCLogFileSize changed to minimum 8K\n"); 2077 } 2078} 2079 2080// This function is called for -Xloggc:<filename>, it can be used 2081// to check if a given file name(or string) conforms to the following 2082// specification: 2083// A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 2084// %p and %t only allowed once. We only limit usage of filename not path 2085bool is_filename_valid(const char *file_name) { 2086 const char* p = file_name; 2087 char file_sep = os::file_separator()[0]; 2088 const char* cp; 2089 // skip prefix path 2090 for (cp = file_name; *cp != '\0'; cp++) { 2091 if (*cp == '/' || *cp == file_sep) { 2092 p = cp + 1; 2093 } 2094 } 2095 2096 int count_p = 0; 2097 int count_t = 0; 2098 while (*p != '\0') { 2099 if ((*p >= '0' && *p <= '9') || 2100 (*p >= 'A' && *p <= 'Z') || 2101 (*p >= 'a' && *p <= 'z') || 2102 *p == '-' || 2103 *p == '_' || 2104 *p == '.') { 2105 p++; 2106 continue; 2107 } 2108 if (*p == '%') { 2109 if(*(p + 1) == 'p') { 2110 p += 2; 2111 count_p ++; 2112 continue; 2113 } 2114 if (*(p + 1) == 't') { 2115 p += 2; 2116 count_t ++; 2117 continue; 2118 } 2119 } 2120 return false; 2121 } 2122 return count_p < 2 && count_t < 2; 2123} 2124 2125bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) { 2126 if (!is_percentage(min_heap_free_ratio)) { 2127 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100"); 2128 return false; 2129 } 2130 if (min_heap_free_ratio > MaxHeapFreeRatio) { 2131 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 2132 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio, 2133 MaxHeapFreeRatio); 2134 return false; 2135 } 2136 // This does not set the flag itself, but stores the value in a safe place for later usage. 2137 _min_heap_free_ratio = min_heap_free_ratio; 2138 return true; 2139} 2140 2141bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) { 2142 if (!is_percentage(max_heap_free_ratio)) { 2143 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100"); 2144 return false; 2145 } 2146 if (max_heap_free_ratio < MinHeapFreeRatio) { 2147 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or " 2148 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio, 2149 MinHeapFreeRatio); 2150 return false; 2151 } 2152 // This does not set the flag itself, but stores the value in a safe place for later usage. 2153 _max_heap_free_ratio = max_heap_free_ratio; 2154 return true; 2155} 2156 2157// Check consistency of GC selection 2158bool Arguments::check_gc_consistency_user() { 2159 check_gclog_consistency(); 2160 bool status = true; 2161 // Ensure that the user has not selected conflicting sets 2162 // of collectors. [Note: this check is merely a user convenience; 2163 // collectors over-ride each other so that only a non-conflicting 2164 // set is selected; however what the user gets is not what they 2165 // may have expected from the combination they asked for. It's 2166 // better to reduce user confusion by not allowing them to 2167 // select conflicting combinations. 2168 uint i = 0; 2169 if (UseSerialGC) i++; 2170 if (UseConcMarkSweepGC || UseParNewGC) i++; 2171 if (UseParallelGC || UseParallelOldGC) i++; 2172 if (UseG1GC) i++; 2173 if (i > 1) { 2174 jio_fprintf(defaultStream::error_stream(), 2175 "Conflicting collector combinations in option list; " 2176 "please refer to the release notes for the combinations " 2177 "allowed\n"); 2178 status = false; 2179 } 2180 return status; 2181} 2182 2183void Arguments::check_deprecated_gcs() { 2184 if (UseConcMarkSweepGC && !UseParNewGC) { 2185 warning("Using the DefNew young collector with the CMS collector is deprecated " 2186 "and will likely be removed in a future release"); 2187 } 2188 2189 if (UseParNewGC && !UseConcMarkSweepGC) { 2190 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 2191 // set up UseSerialGC properly, so that can't be used in the check here. 2192 warning("Using the ParNew young collector with the Serial old collector is deprecated " 2193 "and will likely be removed in a future release"); 2194 } 2195} 2196 2197void Arguments::check_deprecated_gc_flags() { 2198 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 2199 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 2200 "and will likely be removed in future release"); 2201 } 2202 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 2203 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 2204 "Use MaxRAMFraction instead."); 2205 } 2206 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) { 2207 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release."); 2208 } 2209 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) { 2210 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release."); 2211 } 2212 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) { 2213 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release."); 2214 } 2215} 2216 2217// Check stack pages settings 2218bool Arguments::check_stack_pages() 2219{ 2220 bool status = true; 2221 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 2222 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 2223 // greater stack shadow pages can't generate instruction to bang stack 2224 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 2225 return status; 2226} 2227 2228// Check the consistency of vm_init_args 2229bool Arguments::check_vm_args_consistency() { 2230 // Method for adding checks for flag consistency. 2231 // The intent is to warn the user of all possible conflicts, 2232 // before returning an error. 2233 // Note: Needs platform-dependent factoring. 2234 bool status = true; 2235 2236 if (TLABRefillWasteFraction == 0) { 2237 jio_fprintf(defaultStream::error_stream(), 2238 "TLABRefillWasteFraction should be a denominator, " 2239 "not " SIZE_FORMAT "\n", 2240 TLABRefillWasteFraction); 2241 status = false; 2242 } 2243 2244 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 2245 "AdaptiveSizePolicyWeight"); 2246 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 2247 2248 // Divide by bucket size to prevent a large size from causing rollover when 2249 // calculating amount of memory needed to be allocated for the String table. 2250 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2251 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2252 2253 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize, 2254 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size"); 2255 2256 { 2257 // Using "else if" below to avoid printing two error messages if min > max. 2258 // This will also prevent us from reporting both min>100 and max>100 at the 2259 // same time, but that is less annoying than printing two identical errors IMHO. 2260 FormatBuffer<80> err_msg("%s",""); 2261 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) { 2262 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2263 status = false; 2264 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) { 2265 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2266 status = false; 2267 } 2268 } 2269 2270 // Min/MaxMetaspaceFreeRatio 2271 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2272 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2273 2274 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2275 jio_fprintf(defaultStream::error_stream(), 2276 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2277 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2278 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2279 MinMetaspaceFreeRatio, 2280 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2281 MaxMetaspaceFreeRatio); 2282 status = false; 2283 } 2284 2285 // Trying to keep 100% free is not practical 2286 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2287 2288 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2289 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2290 } 2291 2292 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2293 // Settings to encourage splitting. 2294 if (!FLAG_IS_CMDLINE(NewRatio)) { 2295 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2296 } 2297 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2298 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2299 } 2300 } 2301 2302 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2303 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2304 } 2305 2306 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2307 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2308 if (GCTimeLimit == 100) { 2309 // Turn off gc-overhead-limit-exceeded checks 2310 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2311 } 2312 2313 status = status && ArgumentsExt::check_gc_consistency_user(); 2314 status = status && check_stack_pages(); 2315 2316 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2317 "CMSIncrementalSafetyFactor"); 2318 2319 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2320 // insists that we hold the requisite locks so that the iteration is 2321 // MT-safe. For the verification at start-up and shut-down, we don't 2322 // yet have a good way of acquiring and releasing these locks, 2323 // which are not visible at the CollectedHeap level. We want to 2324 // be able to acquire these locks and then do the iteration rather 2325 // than just disable the lock verification. This will be fixed under 2326 // bug 4788986. 2327 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2328 if (VerifyDuringStartup) { 2329 warning("Heap verification at start-up disabled " 2330 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2331 VerifyDuringStartup = false; // Disable verification at start-up 2332 } 2333 2334 if (VerifyBeforeExit) { 2335 warning("Heap verification at shutdown disabled " 2336 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2337 VerifyBeforeExit = false; // Disable verification at shutdown 2338 } 2339 } 2340 2341 // Note: only executed in non-PRODUCT mode 2342 if (!UseAsyncConcMarkSweepGC && 2343 (ExplicitGCInvokesConcurrent || 2344 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2345 jio_fprintf(defaultStream::error_stream(), 2346 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2347 " with -UseAsyncConcMarkSweepGC"); 2348 status = false; 2349 } 2350 2351 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2352 2353#if INCLUDE_ALL_GCS 2354 if (UseG1GC) { 2355 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent"); 2356 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent"); 2357 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent"); 2358 2359 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2360 "InitiatingHeapOccupancyPercent"); 2361 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2362 "G1RefProcDrainInterval"); 2363 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2364 "G1ConcMarkStepDurationMillis"); 2365 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2366 "G1ConcRSHotCardLimit"); 2367 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2368 "G1ConcRSLogCacheSize"); 2369 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age, 2370 "StringDeduplicationAgeThreshold"); 2371 } 2372 if (UseConcMarkSweepGC) { 2373 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2374 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2375 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2376 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2377 2378 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2379 2380 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2381 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2382 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2383 2384 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2385 2386 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2387 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2388 2389 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2390 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2391 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2392 2393 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2394 2395 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2396 2397 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2398 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2399 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2400 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2401 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2402 } 2403 2404 if (UseParallelGC || UseParallelOldGC) { 2405 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2406 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2407 2408 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2409 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2410 2411 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2412 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2413 2414 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2415 2416 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2417 } 2418#endif // INCLUDE_ALL_GCS 2419 2420 status = status && verify_interval(RefDiscoveryPolicy, 2421 ReferenceProcessor::DiscoveryPolicyMin, 2422 ReferenceProcessor::DiscoveryPolicyMax, 2423 "RefDiscoveryPolicy"); 2424 2425 // Limit the lower bound of this flag to 1 as it is used in a division 2426 // expression. 2427 status = status && verify_interval(TLABWasteTargetPercent, 2428 1, 100, "TLABWasteTargetPercent"); 2429 2430 status = status && verify_object_alignment(); 2431 2432 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2433 "CompressedClassSpaceSize"); 2434 2435 status = status && verify_interval(MarkStackSizeMax, 2436 1, (max_jint - 1), "MarkStackSizeMax"); 2437 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2438 2439 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2440 2441 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2442 2443 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2444 2445 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2446 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2447 2448 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2449 2450 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2451 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2452 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2453 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2454 2455 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2456 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2457 2458 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2459 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2460 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2461 2462 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2463 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2464 2465 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold"); 2466 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold"); 2467 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2468 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2469 2470 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2471#ifdef COMPILER1 2472 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize"); 2473#endif 2474 2475 if (PrintNMTStatistics) { 2476#if INCLUDE_NMT 2477 if (MemTracker::tracking_level() == NMT_off) { 2478#endif // INCLUDE_NMT 2479 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2480 PrintNMTStatistics = false; 2481#if INCLUDE_NMT 2482 } 2483#endif 2484 } 2485 2486 // Need to limit the extent of the padding to reasonable size. 2487 // 8K is well beyond the reasonable HW cache line size, even with the 2488 // aggressive prefetching, while still leaving the room for segregating 2489 // among the distinct pages. 2490 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2491 jio_fprintf(defaultStream::error_stream(), 2492 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2493 ContendedPaddingWidth, 0, 8192); 2494 status = false; 2495 } 2496 2497 // Need to enforce the padding not to break the existing field alignments. 2498 // It is sufficient to check against the largest type size. 2499 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2500 jio_fprintf(defaultStream::error_stream(), 2501 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2502 ContendedPaddingWidth, BytesPerLong); 2503 status = false; 2504 } 2505 2506 // Check lower bounds of the code cache 2507 // Template Interpreter code is approximately 3X larger in debug builds. 2508 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2509 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2510 jio_fprintf(defaultStream::error_stream(), 2511 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2512 os::vm_page_size()/K); 2513 status = false; 2514 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2515 jio_fprintf(defaultStream::error_stream(), 2516 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2517 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2518 status = false; 2519 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2520 jio_fprintf(defaultStream::error_stream(), 2521 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2522 min_code_cache_size/K); 2523 status = false; 2524 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2525 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2526 jio_fprintf(defaultStream::error_stream(), 2527 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2528 CODE_CACHE_SIZE_LIMIT/M); 2529 status = false; 2530 } else if (NonNMethodCodeHeapSize < min_code_cache_size){ 2531 jio_fprintf(defaultStream::error_stream(), 2532 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2533 min_code_cache_size/K); 2534 status = false; 2535 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) 2536 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 2537 jio_fprintf(defaultStream::error_stream(), 2538 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 2539 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 2540 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 2541 status = false; 2542 } 2543 2544 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); 2545 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength"); 2546 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize"); 2547 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt"); 2548 2549 2550 int min_number_of_compiler_threads = get_min_number_of_compiler_threads(); 2551 // The default CICompilerCount's value is CI_COMPILER_COUNT. 2552 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number"); 2553 // Check the minimum number of compiler threads 2554 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount"); 2555 2556 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2557 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2558 } 2559 2560 return status; 2561} 2562 2563bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2564 const char* option_type) { 2565 if (ignore) return false; 2566 2567 const char* spacer = " "; 2568 if (option_type == NULL) { 2569 option_type = ++spacer; // Set both to the empty string. 2570 } 2571 2572 if (os::obsolete_option(option)) { 2573 jio_fprintf(defaultStream::error_stream(), 2574 "Obsolete %s%soption: %s\n", option_type, spacer, 2575 option->optionString); 2576 return false; 2577 } else { 2578 jio_fprintf(defaultStream::error_stream(), 2579 "Unrecognized %s%soption: %s\n", option_type, spacer, 2580 option->optionString); 2581 return true; 2582 } 2583} 2584 2585static const char* user_assertion_options[] = { 2586 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2587}; 2588 2589static const char* system_assertion_options[] = { 2590 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2591}; 2592 2593// Return true if any of the strings in null-terminated array 'names' matches. 2594// If tail_allowed is true, then the tail must begin with a colon; otherwise, 2595// the option must match exactly. 2596static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2597 bool tail_allowed) { 2598 for (/* empty */; *names != NULL; ++names) { 2599 if (match_option(option, *names, tail)) { 2600 if (**tail == '\0' || tail_allowed && **tail == ':') { 2601 return true; 2602 } 2603 } 2604 } 2605 return false; 2606} 2607 2608bool Arguments::parse_uintx(const char* value, 2609 uintx* uintx_arg, 2610 uintx min_size) { 2611 2612 // Check the sign first since atomull() parses only unsigned values. 2613 bool value_is_positive = !(*value == '-'); 2614 2615 if (value_is_positive) { 2616 julong n; 2617 bool good_return = atomull(value, &n); 2618 if (good_return) { 2619 bool above_minimum = n >= min_size; 2620 bool value_is_too_large = n > max_uintx; 2621 2622 if (above_minimum && !value_is_too_large) { 2623 *uintx_arg = n; 2624 return true; 2625 } 2626 } 2627 } 2628 return false; 2629} 2630 2631Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2632 julong* long_arg, 2633 julong min_size) { 2634 if (!atomull(s, long_arg)) return arg_unreadable; 2635 return check_memory_size(*long_arg, min_size); 2636} 2637 2638// Parse JavaVMInitArgs structure 2639 2640jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2641 // For components of the system classpath. 2642 SysClassPath scp(Arguments::get_sysclasspath()); 2643 bool scp_assembly_required = false; 2644 2645 // Save default settings for some mode flags 2646 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2647 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2648 Arguments::_ClipInlining = ClipInlining; 2649 Arguments::_BackgroundCompilation = BackgroundCompilation; 2650 2651 // Setup flags for mixed which is the default 2652 set_mode_flags(_mixed); 2653 2654 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2655 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2656 if (result != JNI_OK) { 2657 return result; 2658 } 2659 2660 // Parse JavaVMInitArgs structure passed in 2661 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE); 2662 if (result != JNI_OK) { 2663 return result; 2664 } 2665 2666 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2667 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2668 if (result != JNI_OK) { 2669 return result; 2670 } 2671 2672 // Do final processing now that all arguments have been parsed 2673 result = finalize_vm_init_args(&scp, scp_assembly_required); 2674 if (result != JNI_OK) { 2675 return result; 2676 } 2677 2678 return JNI_OK; 2679} 2680 2681// Checks if name in command-line argument -agent{lib,path}:name[=options] 2682// represents a valid HPROF of JDWP agent. is_path==true denotes that we 2683// are dealing with -agentpath (case where name is a path), otherwise with 2684// -agentlib 2685bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2686 char *_name; 2687 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2688 size_t _len_hprof, _len_jdwp, _len_prefix; 2689 2690 if (is_path) { 2691 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2692 return false; 2693 } 2694 2695 _name++; // skip past last path separator 2696 _len_prefix = strlen(JNI_LIB_PREFIX); 2697 2698 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2699 return false; 2700 } 2701 2702 _name += _len_prefix; 2703 _len_hprof = strlen(_hprof); 2704 _len_jdwp = strlen(_jdwp); 2705 2706 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2707 _name += _len_hprof; 2708 } 2709 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2710 _name += _len_jdwp; 2711 } 2712 else { 2713 return false; 2714 } 2715 2716 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2717 return false; 2718 } 2719 2720 return true; 2721 } 2722 2723 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2724 return true; 2725 } 2726 2727 return false; 2728} 2729 2730jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2731 SysClassPath* scp_p, 2732 bool* scp_assembly_required_p, 2733 Flag::Flags origin) { 2734 // Remaining part of option string 2735 const char* tail; 2736 2737 // iterate over arguments 2738 for (int index = 0; index < args->nOptions; index++) { 2739 bool is_absolute_path = false; // for -agentpath vs -agentlib 2740 2741 const JavaVMOption* option = args->options + index; 2742 2743 if (!match_option(option, "-Djava.class.path", &tail) && 2744 !match_option(option, "-Dsun.java.command", &tail) && 2745 !match_option(option, "-Dsun.java.launcher", &tail)) { 2746 2747 // add all jvm options to the jvm_args string. This string 2748 // is used later to set the java.vm.args PerfData string constant. 2749 // the -Djava.class.path and the -Dsun.java.command options are 2750 // omitted from jvm_args string as each have their own PerfData 2751 // string constant object. 2752 build_jvm_args(option->optionString); 2753 } 2754 2755 // -verbose:[class/gc/jni] 2756 if (match_option(option, "-verbose", &tail)) { 2757 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2758 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2759 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2760 } else if (!strcmp(tail, ":gc")) { 2761 FLAG_SET_CMDLINE(bool, PrintGC, true); 2762 } else if (!strcmp(tail, ":jni")) { 2763 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2764 } 2765 // -da / -ea / -disableassertions / -enableassertions 2766 // These accept an optional class/package name separated by a colon, e.g., 2767 // -da:java.lang.Thread. 2768 } else if (match_option(option, user_assertion_options, &tail, true)) { 2769 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2770 if (*tail == '\0') { 2771 JavaAssertions::setUserClassDefault(enable); 2772 } else { 2773 assert(*tail == ':', "bogus match by match_option()"); 2774 JavaAssertions::addOption(tail + 1, enable); 2775 } 2776 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2777 } else if (match_option(option, system_assertion_options, &tail, false)) { 2778 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2779 JavaAssertions::setSystemClassDefault(enable); 2780 // -bootclasspath: 2781 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2782 scp_p->reset_path(tail); 2783 *scp_assembly_required_p = true; 2784 // -bootclasspath/a: 2785 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2786 scp_p->add_suffix(tail); 2787 *scp_assembly_required_p = true; 2788 // -bootclasspath/p: 2789 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2790 scp_p->add_prefix(tail); 2791 *scp_assembly_required_p = true; 2792 // -Xrun 2793 } else if (match_option(option, "-Xrun", &tail)) { 2794 if (tail != NULL) { 2795 const char* pos = strchr(tail, ':'); 2796 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2797 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2798 name[len] = '\0'; 2799 2800 char *options = NULL; 2801 if(pos != NULL) { 2802 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2803 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2804 } 2805#if !INCLUDE_JVMTI 2806 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2807 jio_fprintf(defaultStream::error_stream(), 2808 "Profiling and debugging agents are not supported in this VM\n"); 2809 return JNI_ERR; 2810 } 2811#endif // !INCLUDE_JVMTI 2812 add_init_library(name, options); 2813 } 2814 // -agentlib and -agentpath 2815 } else if (match_option(option, "-agentlib:", &tail) || 2816 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2817 if(tail != NULL) { 2818 const char* pos = strchr(tail, '='); 2819 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2820 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2821 name[len] = '\0'; 2822 2823 char *options = NULL; 2824 if(pos != NULL) { 2825 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2826 } 2827#if !INCLUDE_JVMTI 2828 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2829 jio_fprintf(defaultStream::error_stream(), 2830 "Profiling and debugging agents are not supported in this VM\n"); 2831 return JNI_ERR; 2832 } 2833#endif // !INCLUDE_JVMTI 2834 add_init_agent(name, options, is_absolute_path); 2835 } 2836 // -javaagent 2837 } else if (match_option(option, "-javaagent:", &tail)) { 2838#if !INCLUDE_JVMTI 2839 jio_fprintf(defaultStream::error_stream(), 2840 "Instrumentation agents are not supported in this VM\n"); 2841 return JNI_ERR; 2842#else 2843 if(tail != NULL) { 2844 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2845 add_init_agent("instrument", options, false); 2846 } 2847#endif // !INCLUDE_JVMTI 2848 // -Xnoclassgc 2849 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2850 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2851 // -Xconcgc 2852 } else if (match_option(option, "-Xconcgc", &tail)) { 2853 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2854 // -Xnoconcgc 2855 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2856 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2857 // -Xbatch 2858 } else if (match_option(option, "-Xbatch", &tail)) { 2859 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2860 // -Xmn for compatibility with other JVM vendors 2861 } else if (match_option(option, "-Xmn", &tail)) { 2862 julong long_initial_young_size = 0; 2863 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2864 if (errcode != arg_in_range) { 2865 jio_fprintf(defaultStream::error_stream(), 2866 "Invalid initial young generation size: %s\n", option->optionString); 2867 describe_range_error(errcode); 2868 return JNI_EINVAL; 2869 } 2870 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size); 2871 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size); 2872 // -Xms 2873 } else if (match_option(option, "-Xms", &tail)) { 2874 julong long_initial_heap_size = 0; 2875 // an initial heap size of 0 means automatically determine 2876 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2877 if (errcode != arg_in_range) { 2878 jio_fprintf(defaultStream::error_stream(), 2879 "Invalid initial heap size: %s\n", option->optionString); 2880 describe_range_error(errcode); 2881 return JNI_EINVAL; 2882 } 2883 set_min_heap_size((uintx)long_initial_heap_size); 2884 // Currently the minimum size and the initial heap sizes are the same. 2885 // Can be overridden with -XX:InitialHeapSize. 2886 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2887 // -Xmx 2888 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2889 julong long_max_heap_size = 0; 2890 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2891 if (errcode != arg_in_range) { 2892 jio_fprintf(defaultStream::error_stream(), 2893 "Invalid maximum heap size: %s\n", option->optionString); 2894 describe_range_error(errcode); 2895 return JNI_EINVAL; 2896 } 2897 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2898 // Xmaxf 2899 } else if (match_option(option, "-Xmaxf", &tail)) { 2900 char* err; 2901 int maxf = (int)(strtod(tail, &err) * 100); 2902 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) { 2903 jio_fprintf(defaultStream::error_stream(), 2904 "Bad max heap free percentage size: %s\n", 2905 option->optionString); 2906 return JNI_EINVAL; 2907 } else { 2908 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2909 } 2910 // Xminf 2911 } else if (match_option(option, "-Xminf", &tail)) { 2912 char* err; 2913 int minf = (int)(strtod(tail, &err) * 100); 2914 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) { 2915 jio_fprintf(defaultStream::error_stream(), 2916 "Bad min heap free percentage size: %s\n", 2917 option->optionString); 2918 return JNI_EINVAL; 2919 } else { 2920 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2921 } 2922 // -Xss 2923 } else if (match_option(option, "-Xss", &tail)) { 2924 julong long_ThreadStackSize = 0; 2925 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2926 if (errcode != arg_in_range) { 2927 jio_fprintf(defaultStream::error_stream(), 2928 "Invalid thread stack size: %s\n", option->optionString); 2929 describe_range_error(errcode); 2930 return JNI_EINVAL; 2931 } 2932 // Internally track ThreadStackSize in units of 1024 bytes. 2933 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2934 round_to((int)long_ThreadStackSize, K) / K); 2935 // -Xoss 2936 } else if (match_option(option, "-Xoss", &tail)) { 2937 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2938 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2939 julong long_CodeCacheExpansionSize = 0; 2940 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2941 if (errcode != arg_in_range) { 2942 jio_fprintf(defaultStream::error_stream(), 2943 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2944 os::vm_page_size()/K); 2945 return JNI_EINVAL; 2946 } 2947 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2948 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2949 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2950 julong long_ReservedCodeCacheSize = 0; 2951 2952 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2953 if (errcode != arg_in_range) { 2954 jio_fprintf(defaultStream::error_stream(), 2955 "Invalid maximum code cache size: %s.\n", option->optionString); 2956 return JNI_EINVAL; 2957 } 2958 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2959 // -XX:NonNMethodCodeHeapSize= 2960 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 2961 julong long_NonNMethodCodeHeapSize = 0; 2962 2963 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 2964 if (errcode != arg_in_range) { 2965 jio_fprintf(defaultStream::error_stream(), 2966 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 2967 return JNI_EINVAL; 2968 } 2969 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize); 2970 // -XX:ProfiledCodeHeapSize= 2971 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 2972 julong long_ProfiledCodeHeapSize = 0; 2973 2974 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 2975 if (errcode != arg_in_range) { 2976 jio_fprintf(defaultStream::error_stream(), 2977 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 2978 return JNI_EINVAL; 2979 } 2980 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize); 2981 // -XX:NonProfiledCodeHeapSizee= 2982 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 2983 julong long_NonProfiledCodeHeapSize = 0; 2984 2985 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 2986 if (errcode != arg_in_range) { 2987 jio_fprintf(defaultStream::error_stream(), 2988 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 2989 return JNI_EINVAL; 2990 } 2991 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize); 2992 //-XX:IncreaseFirstTierCompileThresholdAt= 2993 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2994 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2995 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2996 jio_fprintf(defaultStream::error_stream(), 2997 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2998 option->optionString); 2999 return JNI_EINVAL; 3000 } 3001 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 3002 // -green 3003 } else if (match_option(option, "-green", &tail)) { 3004 jio_fprintf(defaultStream::error_stream(), 3005 "Green threads support not available\n"); 3006 return JNI_EINVAL; 3007 // -native 3008 } else if (match_option(option, "-native", &tail)) { 3009 // HotSpot always uses native threads, ignore silently for compatibility 3010 // -Xsqnopause 3011 } else if (match_option(option, "-Xsqnopause", &tail)) { 3012 // EVM option, ignore silently for compatibility 3013 // -Xrs 3014 } else if (match_option(option, "-Xrs", &tail)) { 3015 // Classic/EVM option, new functionality 3016 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 3017 } else if (match_option(option, "-Xusealtsigs", &tail)) { 3018 // change default internal VM signals used - lower case for back compat 3019 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 3020 // -Xoptimize 3021 } else if (match_option(option, "-Xoptimize", &tail)) { 3022 // EVM option, ignore silently for compatibility 3023 // -Xprof 3024 } else if (match_option(option, "-Xprof", &tail)) { 3025#if INCLUDE_FPROF 3026 _has_profile = true; 3027#else // INCLUDE_FPROF 3028 jio_fprintf(defaultStream::error_stream(), 3029 "Flat profiling is not supported in this VM.\n"); 3030 return JNI_ERR; 3031#endif // INCLUDE_FPROF 3032 // -Xconcurrentio 3033 } else if (match_option(option, "-Xconcurrentio", &tail)) { 3034 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 3035 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 3036 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 3037 FLAG_SET_CMDLINE(bool, UseTLAB, false); 3038 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 3039 3040 // -Xinternalversion 3041 } else if (match_option(option, "-Xinternalversion", &tail)) { 3042 jio_fprintf(defaultStream::output_stream(), "%s\n", 3043 VM_Version::internal_vm_info_string()); 3044 vm_exit(0); 3045#ifndef PRODUCT 3046 // -Xprintflags 3047 } else if (match_option(option, "-Xprintflags", &tail)) { 3048 CommandLineFlags::printFlags(tty, false); 3049 vm_exit(0); 3050#endif 3051 // -D 3052 } else if (match_option(option, "-D", &tail)) { 3053 if (!add_property(tail)) { 3054 return JNI_ENOMEM; 3055 } 3056 // Out of the box management support 3057 if (match_option(option, "-Dcom.sun.management", &tail)) { 3058#if INCLUDE_MANAGEMENT 3059 FLAG_SET_CMDLINE(bool, ManagementServer, true); 3060#else 3061 jio_fprintf(defaultStream::output_stream(), 3062 "-Dcom.sun.management is not supported in this VM.\n"); 3063 return JNI_ERR; 3064#endif 3065 } 3066 // -Xint 3067 } else if (match_option(option, "-Xint", &tail)) { 3068 set_mode_flags(_int); 3069 // -Xmixed 3070 } else if (match_option(option, "-Xmixed", &tail)) { 3071 set_mode_flags(_mixed); 3072 // -Xcomp 3073 } else if (match_option(option, "-Xcomp", &tail)) { 3074 // for testing the compiler; turn off all flags that inhibit compilation 3075 set_mode_flags(_comp); 3076 // -Xshare:dump 3077 } else if (match_option(option, "-Xshare:dump", &tail)) { 3078 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 3079 set_mode_flags(_int); // Prevent compilation, which creates objects 3080 // -Xshare:on 3081 } else if (match_option(option, "-Xshare:on", &tail)) { 3082 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3083 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3084 // -Xshare:auto 3085 } else if (match_option(option, "-Xshare:auto", &tail)) { 3086 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3087 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3088 // -Xshare:off 3089 } else if (match_option(option, "-Xshare:off", &tail)) { 3090 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 3091 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3092 // -Xverify 3093 } else if (match_option(option, "-Xverify", &tail)) { 3094 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3095 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 3096 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3097 } else if (strcmp(tail, ":remote") == 0) { 3098 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3099 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3100 } else if (strcmp(tail, ":none") == 0) { 3101 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3102 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 3103 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3104 return JNI_EINVAL; 3105 } 3106 // -Xdebug 3107 } else if (match_option(option, "-Xdebug", &tail)) { 3108 // note this flag has been used, then ignore 3109 set_xdebug_mode(true); 3110 // -Xnoagent 3111 } else if (match_option(option, "-Xnoagent", &tail)) { 3112 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3113 } else if (match_option(option, "-Xboundthreads", &tail)) { 3114 // Bind user level threads to kernel threads (Solaris only) 3115 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 3116 } else if (match_option(option, "-Xloggc:", &tail)) { 3117 // Redirect GC output to the file. -Xloggc:<filename> 3118 // ostream_init_log(), when called will use this filename 3119 // to initialize a fileStream. 3120 _gc_log_filename = os::strdup_check_oom(tail); 3121 if (!is_filename_valid(_gc_log_filename)) { 3122 jio_fprintf(defaultStream::output_stream(), 3123 "Invalid file name for use with -Xloggc: Filename can only contain the " 3124 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 3125 "Note %%p or %%t can only be used once\n", _gc_log_filename); 3126 return JNI_EINVAL; 3127 } 3128 FLAG_SET_CMDLINE(bool, PrintGC, true); 3129 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 3130 3131 // JNI hooks 3132 } else if (match_option(option, "-Xcheck", &tail)) { 3133 if (!strcmp(tail, ":jni")) { 3134#if !INCLUDE_JNI_CHECK 3135 warning("JNI CHECKING is not supported in this VM"); 3136#else 3137 CheckJNICalls = true; 3138#endif // INCLUDE_JNI_CHECK 3139 } else if (is_bad_option(option, args->ignoreUnrecognized, 3140 "check")) { 3141 return JNI_EINVAL; 3142 } 3143 } else if (match_option(option, "vfprintf", &tail)) { 3144 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3145 } else if (match_option(option, "exit", &tail)) { 3146 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3147 } else if (match_option(option, "abort", &tail)) { 3148 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3149 // -XX:+AggressiveHeap 3150 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 3151 3152 // This option inspects the machine and attempts to set various 3153 // parameters to be optimal for long-running, memory allocation 3154 // intensive jobs. It is intended for machines with large 3155 // amounts of cpu and memory. 3156 3157 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 3158 // VM, but we may not be able to represent the total physical memory 3159 // available (like having 8gb of memory on a box but using a 32bit VM). 3160 // Thus, we need to make sure we're using a julong for intermediate 3161 // calculations. 3162 julong initHeapSize; 3163 julong total_memory = os::physical_memory(); 3164 3165 if (total_memory < (julong)256*M) { 3166 jio_fprintf(defaultStream::error_stream(), 3167 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 3168 vm_exit(1); 3169 } 3170 3171 // The heap size is half of available memory, or (at most) 3172 // all of possible memory less 160mb (leaving room for the OS 3173 // when using ISM). This is the maximum; because adaptive sizing 3174 // is turned on below, the actual space used may be smaller. 3175 3176 initHeapSize = MIN2(total_memory / (julong)2, 3177 total_memory - (julong)160*M); 3178 3179 initHeapSize = limit_by_allocatable_memory(initHeapSize); 3180 3181 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 3182 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 3183 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 3184 // Currently the minimum size and the initial heap sizes are the same. 3185 set_min_heap_size(initHeapSize); 3186 } 3187 if (FLAG_IS_DEFAULT(NewSize)) { 3188 // Make the young generation 3/8ths of the total heap. 3189 FLAG_SET_CMDLINE(uintx, NewSize, 3190 ((julong)MaxHeapSize / (julong)8) * (julong)3); 3191 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 3192 } 3193 3194#ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3195 FLAG_SET_DEFAULT(UseLargePages, true); 3196#endif 3197 3198 // Increase some data structure sizes for efficiency 3199 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 3200 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3201 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 3202 3203 // See the OldPLABSize comment below, but replace 'after promotion' 3204 // with 'after copying'. YoungPLABSize is the size of the survivor 3205 // space per-gc-thread buffers. The default is 4kw. 3206 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 3207 3208 // OldPLABSize is the size of the buffers in the old gen that 3209 // UseParallelGC uses to promote live data that doesn't fit in the 3210 // survivor spaces. At any given time, there's one for each gc thread. 3211 // The default size is 1kw. These buffers are rarely used, since the 3212 // survivor spaces are usually big enough. For specjbb, however, there 3213 // are occasions when there's lots of live data in the young gen 3214 // and we end up promoting some of it. We don't have a definite 3215 // explanation for why bumping OldPLABSize helps, but the theory 3216 // is that a bigger PLAB results in retaining something like the 3217 // original allocation order after promotion, which improves mutator 3218 // locality. A minor effect may be that larger PLABs reduce the 3219 // number of PLAB allocation events during gc. The value of 8kw 3220 // was arrived at by experimenting with specjbb. 3221 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 3222 3223 // Enable parallel GC and adaptive generation sizing 3224 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 3225 FLAG_SET_DEFAULT(ParallelGCThreads, 3226 Abstract_VM_Version::parallel_worker_threads()); 3227 3228 // Encourage steady state memory management 3229 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 3230 3231 // This appears to improve mutator locality 3232 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3233 3234 // Get around early Solaris scheduling bug 3235 // (affinity vs other jobs on system) 3236 // but disallow DR and offlining (5008695). 3237 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 3238 3239 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3240 // and the last option wins. 3241 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 3242 FLAG_SET_CMDLINE(bool, NeverTenure, true); 3243 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3244 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1); 3245 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 3246 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3247 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3248 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 3249 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3250 uintx max_tenuring_thresh = 0; 3251 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3252 jio_fprintf(defaultStream::error_stream(), 3253 "Invalid MaxTenuringThreshold: %s\n", option->optionString); 3254 } 3255 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh); 3256 3257 if (MaxTenuringThreshold == 0) { 3258 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3259 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3260 } else { 3261 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3262 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3263 } 3264 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 3265 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 3266 jio_fprintf(defaultStream::error_stream(), 3267 "Please use CMSClassUnloadingEnabled in place of " 3268 "CMSPermGenSweepingEnabled in the future\n"); 3269 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 3270 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 3271 jio_fprintf(defaultStream::error_stream(), 3272 "Please use -XX:+UseGCOverheadLimit in place of " 3273 "-XX:+UseGCTimeLimit in the future\n"); 3274 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 3275 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 3276 jio_fprintf(defaultStream::error_stream(), 3277 "Please use -XX:-UseGCOverheadLimit in place of " 3278 "-XX:-UseGCTimeLimit in the future\n"); 3279 // The TLE options are for compatibility with 1.3 and will be 3280 // removed without notice in a future release. These options 3281 // are not to be documented. 3282 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 3283 // No longer used. 3284 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 3285 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 3286 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 3287 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3288 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 3289 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 3290 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 3291 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 3292 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 3293 // No longer used. 3294 } else if (match_option(option, "-XX:TLESize=", &tail)) { 3295 julong long_tlab_size = 0; 3296 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 3297 if (errcode != arg_in_range) { 3298 jio_fprintf(defaultStream::error_stream(), 3299 "Invalid TLAB size: %s\n", option->optionString); 3300 describe_range_error(errcode); 3301 return JNI_EINVAL; 3302 } 3303 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 3304 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 3305 // No longer used. 3306 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 3307 FLAG_SET_CMDLINE(bool, UseTLAB, true); 3308 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 3309 FLAG_SET_CMDLINE(bool, UseTLAB, false); 3310 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 3311 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3312 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3313 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 3314 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3315 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3316 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 3317#if defined(DTRACE_ENABLED) 3318 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3319 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3320 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3321 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3322#else // defined(DTRACE_ENABLED) 3323 jio_fprintf(defaultStream::error_stream(), 3324 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3325 return JNI_EINVAL; 3326#endif // defined(DTRACE_ENABLED) 3327#ifdef ASSERT 3328 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 3329 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3330 // disable scavenge before parallel mark-compact 3331 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3332#endif 3333 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 3334 julong cms_blocks_to_claim = (julong)atol(tail); 3335 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3336 jio_fprintf(defaultStream::error_stream(), 3337 "Please use -XX:OldPLABSize in place of " 3338 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 3339 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 3340 julong cms_blocks_to_claim = (julong)atol(tail); 3341 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3342 jio_fprintf(defaultStream::error_stream(), 3343 "Please use -XX:OldPLABSize in place of " 3344 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 3345 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 3346 julong old_plab_size = 0; 3347 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 3348 if (errcode != arg_in_range) { 3349 jio_fprintf(defaultStream::error_stream(), 3350 "Invalid old PLAB size: %s\n", option->optionString); 3351 describe_range_error(errcode); 3352 return JNI_EINVAL; 3353 } 3354 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 3355 jio_fprintf(defaultStream::error_stream(), 3356 "Please use -XX:OldPLABSize in place of " 3357 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 3358 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 3359 julong young_plab_size = 0; 3360 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 3361 if (errcode != arg_in_range) { 3362 jio_fprintf(defaultStream::error_stream(), 3363 "Invalid young PLAB size: %s\n", option->optionString); 3364 describe_range_error(errcode); 3365 return JNI_EINVAL; 3366 } 3367 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 3368 jio_fprintf(defaultStream::error_stream(), 3369 "Please use -XX:YoungPLABSize in place of " 3370 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 3371 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3372 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3373 julong stack_size = 0; 3374 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3375 if (errcode != arg_in_range) { 3376 jio_fprintf(defaultStream::error_stream(), 3377 "Invalid mark stack size: %s\n", option->optionString); 3378 describe_range_error(errcode); 3379 return JNI_EINVAL; 3380 } 3381 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3382 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3383 julong max_stack_size = 0; 3384 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3385 if (errcode != arg_in_range) { 3386 jio_fprintf(defaultStream::error_stream(), 3387 "Invalid maximum mark stack size: %s\n", 3388 option->optionString); 3389 describe_range_error(errcode); 3390 return JNI_EINVAL; 3391 } 3392 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3393 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3394 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3395 uintx conc_threads = 0; 3396 if (!parse_uintx(tail, &conc_threads, 1)) { 3397 jio_fprintf(defaultStream::error_stream(), 3398 "Invalid concurrent threads: %s\n", option->optionString); 3399 return JNI_EINVAL; 3400 } 3401 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3402 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3403 julong max_direct_memory_size = 0; 3404 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3405 if (errcode != arg_in_range) { 3406 jio_fprintf(defaultStream::error_stream(), 3407 "Invalid maximum direct memory size: %s\n", 3408 option->optionString); 3409 describe_range_error(errcode); 3410 return JNI_EINVAL; 3411 } 3412 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3413#if !INCLUDE_MANAGEMENT 3414 } else if (match_option(option, "-XX:+ManagementServer", &tail)) { 3415 jio_fprintf(defaultStream::error_stream(), 3416 "ManagementServer is not supported in this VM.\n"); 3417 return JNI_ERR; 3418#endif // INCLUDE_MANAGEMENT 3419 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3420 // Skip -XX:Flags= since that case has already been handled 3421 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3422 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3423 return JNI_EINVAL; 3424 } 3425 } 3426 // Unknown option 3427 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3428 return JNI_ERR; 3429 } 3430 } 3431 3432 // PrintSharedArchiveAndExit will turn on 3433 // -Xshare:on 3434 // -XX:+TraceClassPaths 3435 if (PrintSharedArchiveAndExit) { 3436 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3437 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3438 FLAG_SET_CMDLINE(bool, TraceClassPaths, true); 3439 } 3440 3441 // Change the default value for flags which have different default values 3442 // when working with older JDKs. 3443#ifdef LINUX 3444 if (JDK_Version::current().compare_major(6) <= 0 && 3445 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3446 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3447 } 3448#endif // LINUX 3449 fix_appclasspath(); 3450 return JNI_OK; 3451} 3452 3453// Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3454// 3455// This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3456// in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3457// Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3458// path is treated as the current directory. 3459// 3460// This causes problems with CDS, which requires that all directories specified in the classpath 3461// must be empty. In most cases, applications do NOT want to load classes from the current 3462// directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3463// scripts compatible with CDS. 3464void Arguments::fix_appclasspath() { 3465 if (IgnoreEmptyClassPaths) { 3466 const char separator = *os::path_separator(); 3467 const char* src = _java_class_path->value(); 3468 3469 // skip over all the leading empty paths 3470 while (*src == separator) { 3471 src ++; 3472 } 3473 3474 char* copy = AllocateHeap(strlen(src) + 1, mtInternal); 3475 strncpy(copy, src, strlen(src) + 1); 3476 3477 // trim all trailing empty paths 3478 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3479 *tail = '\0'; 3480 } 3481 3482 char from[3] = {separator, separator, '\0'}; 3483 char to [2] = {separator, '\0'}; 3484 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3485 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3486 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3487 } 3488 3489 _java_class_path->set_value(copy); 3490 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3491 } 3492 3493 if (!PrintSharedArchiveAndExit) { 3494 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value()); 3495 } 3496} 3497 3498jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3499 // This must be done after all -D arguments have been processed. 3500 scp_p->expand_endorsed(); 3501 3502 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 3503 // Assemble the bootclasspath elements into the final path. 3504 Arguments::set_sysclasspath(scp_p->combined_path()); 3505 } 3506 3507 // This must be done after all arguments have been processed. 3508 // java_compiler() true means set to "NONE" or empty. 3509 if (java_compiler() && !xdebug_mode()) { 3510 // For backwards compatibility, we switch to interpreted mode if 3511 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3512 // not specified. 3513 set_mode_flags(_int); 3514 } 3515 3516 if ((TieredCompilation && CompileThresholdScaling == 0) 3517 || (!TieredCompilation && get_scaled_compile_threshold(CompileThreshold) == 0)) { 3518 set_mode_flags(_int); 3519 } 3520 3521 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3522 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3523 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3524 } 3525 3526#ifndef COMPILER2 3527 // Don't degrade server performance for footprint 3528 if (FLAG_IS_DEFAULT(UseLargePages) && 3529 MaxHeapSize < LargePageHeapSizeThreshold) { 3530 // No need for large granularity pages w/small heaps. 3531 // Note that large pages are enabled/disabled for both the 3532 // Java heap and the code cache. 3533 FLAG_SET_DEFAULT(UseLargePages, false); 3534 } 3535 3536#else 3537 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3538 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3539 } 3540#endif 3541 3542#ifndef TIERED 3543 // Tiered compilation is undefined. 3544 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3545#endif 3546 3547 // If we are running in a headless jre, force java.awt.headless property 3548 // to be true unless the property has already been set. 3549 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3550 if (os::is_headless_jre()) { 3551 const char* headless = Arguments::get_property("java.awt.headless"); 3552 if (headless == NULL) { 3553 char envbuffer[128]; 3554 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3555 if (!add_property("java.awt.headless=true")) { 3556 return JNI_ENOMEM; 3557 } 3558 } else { 3559 char buffer[256]; 3560 strcpy(buffer, "java.awt.headless="); 3561 strcat(buffer, envbuffer); 3562 if (!add_property(buffer)) { 3563 return JNI_ENOMEM; 3564 } 3565 } 3566 } 3567 } 3568 3569 if (!ArgumentsExt::check_vm_args_consistency()) { 3570 return JNI_ERR; 3571 } 3572 3573 return JNI_OK; 3574} 3575 3576jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3577 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3578 scp_assembly_required_p); 3579} 3580 3581jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3582 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3583 scp_assembly_required_p); 3584} 3585 3586jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3587 const int N_MAX_OPTIONS = 64; 3588 const int OPTION_BUFFER_SIZE = 1024; 3589 char buffer[OPTION_BUFFER_SIZE]; 3590 3591 // The variable will be ignored if it exceeds the length of the buffer. 3592 // Don't check this variable if user has special privileges 3593 // (e.g. unix su command). 3594 if (os::getenv(name, buffer, sizeof(buffer)) && 3595 !os::have_special_privileges()) { 3596 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3597 jio_fprintf(defaultStream::error_stream(), 3598 "Picked up %s: %s\n", name, buffer); 3599 char* rd = buffer; // pointer to the input string (rd) 3600 int i; 3601 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3602 while (isspace(*rd)) rd++; // skip whitespace 3603 if (*rd == 0) break; // we re done when the input string is read completely 3604 3605 // The output, option string, overwrites the input string. 3606 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3607 // input string (rd). 3608 char* wrt = rd; 3609 3610 options[i++].optionString = wrt; // Fill in option 3611 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3612 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3613 int quote = *rd; // matching quote to look for 3614 rd++; // don't copy open quote 3615 while (*rd != quote) { // include everything (even spaces) up until quote 3616 if (*rd == 0) { // string termination means unmatched string 3617 jio_fprintf(defaultStream::error_stream(), 3618 "Unmatched quote in %s\n", name); 3619 return JNI_ERR; 3620 } 3621 *wrt++ = *rd++; // copy to option string 3622 } 3623 rd++; // don't copy close quote 3624 } else { 3625 *wrt++ = *rd++; // copy to option string 3626 } 3627 } 3628 // Need to check if we're done before writing a NULL, 3629 // because the write could be to the byte that rd is pointing to. 3630 if (*rd++ == 0) { 3631 *wrt = 0; 3632 break; 3633 } 3634 *wrt = 0; // Zero terminate option 3635 } 3636 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3637 JavaVMInitArgs vm_args; 3638 vm_args.version = JNI_VERSION_1_2; 3639 vm_args.options = options; 3640 vm_args.nOptions = i; 3641 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3642 3643 if (PrintVMOptions) { 3644 const char* tail; 3645 for (int i = 0; i < vm_args.nOptions; i++) { 3646 const JavaVMOption *option = vm_args.options + i; 3647 if (match_option(option, "-XX:", &tail)) { 3648 logOption(tail); 3649 } 3650 } 3651 } 3652 3653 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR)); 3654 } 3655 return JNI_OK; 3656} 3657 3658void Arguments::set_shared_spaces_flags() { 3659 if (DumpSharedSpaces) { 3660 if (RequireSharedSpaces) { 3661 warning("cannot dump shared archive while using shared archive"); 3662 } 3663 UseSharedSpaces = false; 3664#ifdef _LP64 3665 if (!UseCompressedOops || !UseCompressedClassPointers) { 3666 vm_exit_during_initialization( 3667 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3668 } 3669 } else { 3670 if (!UseCompressedOops || !UseCompressedClassPointers) { 3671 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3672 } 3673#endif 3674 } 3675} 3676 3677#if !INCLUDE_ALL_GCS 3678static void force_serial_gc() { 3679 FLAG_SET_DEFAULT(UseSerialGC, true); 3680 UNSUPPORTED_GC_OPTION(UseG1GC); 3681 UNSUPPORTED_GC_OPTION(UseParallelGC); 3682 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3683 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3684 UNSUPPORTED_GC_OPTION(UseParNewGC); 3685} 3686#endif // INCLUDE_ALL_GCS 3687 3688// Sharing support 3689// Construct the path to the archive 3690static char* get_shared_archive_path() { 3691 char *shared_archive_path; 3692 if (SharedArchiveFile == NULL) { 3693 char jvm_path[JVM_MAXPATHLEN]; 3694 os::jvm_path(jvm_path, sizeof(jvm_path)); 3695 char *end = strrchr(jvm_path, *os::file_separator()); 3696 if (end != NULL) *end = '\0'; 3697 size_t jvm_path_len = strlen(jvm_path); 3698 size_t file_sep_len = strlen(os::file_separator()); 3699 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3700 file_sep_len + 20, mtInternal); 3701 if (shared_archive_path != NULL) { 3702 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3703 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3704 strncat(shared_archive_path, "classes.jsa", 11); 3705 } 3706 } else { 3707 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3708 if (shared_archive_path != NULL) { 3709 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3710 } 3711 } 3712 return shared_archive_path; 3713} 3714 3715#ifndef PRODUCT 3716// Determine whether LogVMOutput should be implicitly turned on. 3717static bool use_vm_log() { 3718 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3719 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3720 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3721 PrintAssembly || TraceDeoptimization || TraceDependencies || 3722 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3723 return true; 3724 } 3725 3726#ifdef COMPILER1 3727 if (PrintC1Statistics) { 3728 return true; 3729 } 3730#endif // COMPILER1 3731 3732#ifdef COMPILER2 3733 if (PrintOptoAssembly || PrintOptoStatistics) { 3734 return true; 3735 } 3736#endif // COMPILER2 3737 3738 return false; 3739} 3740#endif // PRODUCT 3741 3742// Parse entry point called from JNI_CreateJavaVM 3743 3744jint Arguments::parse(const JavaVMInitArgs* args) { 3745 3746 // Remaining part of option string 3747 const char* tail; 3748 3749 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3750 const char* hotspotrc = ".hotspotrc"; 3751 bool settings_file_specified = false; 3752 bool needs_hotspotrc_warning = false; 3753 3754 const char* flags_file; 3755 int index; 3756 for (index = 0; index < args->nOptions; index++) { 3757 const JavaVMOption *option = args->options + index; 3758 if (ArgumentsExt::process_options(option)) { 3759 continue; 3760 } 3761 if (match_option(option, "-XX:Flags=", &tail)) { 3762 flags_file = tail; 3763 settings_file_specified = true; 3764 continue; 3765 } 3766 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3767 PrintVMOptions = true; 3768 continue; 3769 } 3770 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3771 PrintVMOptions = false; 3772 continue; 3773 } 3774 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3775 IgnoreUnrecognizedVMOptions = true; 3776 continue; 3777 } 3778 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3779 IgnoreUnrecognizedVMOptions = false; 3780 continue; 3781 } 3782 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3783 CommandLineFlags::printFlags(tty, false); 3784 vm_exit(0); 3785 } 3786#if INCLUDE_NMT 3787 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3788 // The launcher did not setup nmt environment variable properly. 3789 if (!MemTracker::check_launcher_nmt_support(tail)) { 3790 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3791 } 3792 3793 // Verify if nmt option is valid. 3794 if (MemTracker::verify_nmt_option()) { 3795 // Late initialization, still in single-threaded mode. 3796 if (MemTracker::tracking_level() >= NMT_summary) { 3797 MemTracker::init(); 3798 } 3799 } else { 3800 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3801 } 3802 continue; 3803 } 3804#endif 3805 3806 3807#ifndef PRODUCT 3808 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3809 CommandLineFlags::printFlags(tty, true); 3810 vm_exit(0); 3811 } 3812#endif 3813 } 3814 3815 if (IgnoreUnrecognizedVMOptions) { 3816 // uncast const to modify the flag args->ignoreUnrecognized 3817 *(jboolean*)(&args->ignoreUnrecognized) = true; 3818 } 3819 3820 // Parse specified settings file 3821 if (settings_file_specified) { 3822 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3823 return JNI_EINVAL; 3824 } 3825 } else { 3826#ifdef ASSERT 3827 // Parse default .hotspotrc settings file 3828 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3829 return JNI_EINVAL; 3830 } 3831#else 3832 struct stat buf; 3833 if (os::stat(hotspotrc, &buf) == 0) { 3834 needs_hotspotrc_warning = true; 3835 } 3836#endif 3837 } 3838 3839 if (PrintVMOptions) { 3840 for (index = 0; index < args->nOptions; index++) { 3841 const JavaVMOption *option = args->options + index; 3842 if (match_option(option, "-XX:", &tail)) { 3843 logOption(tail); 3844 } 3845 } 3846 } 3847 3848 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3849 jint result = parse_vm_init_args(args); 3850 if (result != JNI_OK) { 3851 return result; 3852 } 3853 3854 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3855 SharedArchivePath = get_shared_archive_path(); 3856 if (SharedArchivePath == NULL) { 3857 return JNI_ENOMEM; 3858 } 3859 3860 // Set up VerifySharedSpaces 3861 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 3862 VerifySharedSpaces = true; 3863 } 3864 3865 // Delay warning until here so that we've had a chance to process 3866 // the -XX:-PrintWarnings flag 3867 if (needs_hotspotrc_warning) { 3868 warning("%s file is present but has been ignored. " 3869 "Run with -XX:Flags=%s to load the file.", 3870 hotspotrc, hotspotrc); 3871 } 3872 3873#ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3874 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3875#endif 3876 3877#if INCLUDE_ALL_GCS 3878 #if (defined JAVASE_EMBEDDED || defined ARM) 3879 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3880 #endif 3881#endif 3882 3883#ifndef PRODUCT 3884 if (TraceBytecodesAt != 0) { 3885 TraceBytecodes = true; 3886 } 3887 if (CountCompiledCalls) { 3888 if (UseCounterDecay) { 3889 warning("UseCounterDecay disabled because CountCalls is set"); 3890 UseCounterDecay = false; 3891 } 3892 } 3893#endif // PRODUCT 3894 3895 if (ScavengeRootsInCode == 0) { 3896 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3897 warning("forcing ScavengeRootsInCode non-zero"); 3898 } 3899 ScavengeRootsInCode = 1; 3900 } 3901 3902 if (PrintGCDetails) { 3903 // Turn on -verbose:gc options as well 3904 PrintGC = true; 3905 } 3906 3907 // Set object alignment values. 3908 set_object_alignment(); 3909 3910#if !INCLUDE_ALL_GCS 3911 force_serial_gc(); 3912#endif // INCLUDE_ALL_GCS 3913#if !INCLUDE_CDS 3914 if (DumpSharedSpaces || RequireSharedSpaces) { 3915 jio_fprintf(defaultStream::error_stream(), 3916 "Shared spaces are not supported in this VM\n"); 3917 return JNI_ERR; 3918 } 3919 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3920 warning("Shared spaces are not supported in this VM"); 3921 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3922 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3923 } 3924 no_shared_spaces("CDS Disabled"); 3925#endif // INCLUDE_CDS 3926 3927 return JNI_OK; 3928} 3929 3930jint Arguments::apply_ergo() { 3931 3932 // Set flags based on ergonomics. 3933 set_ergonomics_flags(); 3934 3935 set_shared_spaces_flags(); 3936 3937 // Check the GC selections again. 3938 if (!ArgumentsExt::check_gc_consistency_ergo()) { 3939 return JNI_EINVAL; 3940 } 3941 3942 if (TieredCompilation) { 3943 set_tiered_flags(); 3944 } else { 3945 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3946 if (CompilationPolicyChoice >= 2) { 3947 vm_exit_during_initialization( 3948 "Incompatible compilation policy selected", NULL); 3949 } 3950 // Scale CompileThreshold 3951 if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) { 3952 FLAG_SET_ERGO(intx, CompileThreshold, get_scaled_compile_threshold(CompileThreshold)); 3953 } 3954 } 3955 3956#ifdef COMPILER2 3957#ifndef PRODUCT 3958 if (PrintIdealGraphLevel > 0) { 3959 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 3960 } 3961#endif 3962#endif 3963 3964 // Set heap size based on available physical memory 3965 set_heap_size(); 3966 3967 set_gc_specific_flags(); 3968 3969 // Initialize Metaspace flags and alignments 3970 Metaspace::ergo_initialize(); 3971 3972 // Set bytecode rewriting flags 3973 set_bytecode_flags(); 3974 3975 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 3976 set_aggressive_opts_flags(); 3977 3978 // Turn off biased locking for locking debug mode flags, 3979 // which are subtly different from each other but neither works with 3980 // biased locking 3981 if (UseHeavyMonitors 3982#ifdef COMPILER1 3983 || !UseFastLocking 3984#endif // COMPILER1 3985 ) { 3986 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3987 // flag set to true on command line; warn the user that they 3988 // can't enable biased locking here 3989 warning("Biased Locking is not supported with locking debug flags" 3990 "; ignoring UseBiasedLocking flag." ); 3991 } 3992 UseBiasedLocking = false; 3993 } 3994 3995#ifdef ZERO 3996 // Clear flags not supported on zero. 3997 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3998 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3999 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4000 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4001#endif // CC_INTERP 4002 4003#ifdef COMPILER2 4004 if (!EliminateLocks) { 4005 EliminateNestedLocks = false; 4006 } 4007 if (!Inline) { 4008 IncrementalInline = false; 4009 } 4010#ifndef PRODUCT 4011 if (!IncrementalInline) { 4012 AlwaysIncrementalInline = false; 4013 } 4014#endif 4015 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 4016 // nothing to use the profiling, turn if off 4017 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 4018 } 4019#endif 4020 4021 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4022 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4023 DebugNonSafepoints = true; 4024 } 4025 4026 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4027 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4028 } 4029 4030#ifndef PRODUCT 4031 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4032 if (use_vm_log()) { 4033 LogVMOutput = true; 4034 } 4035 } 4036#endif // PRODUCT 4037 4038 if (PrintCommandLineFlags) { 4039 CommandLineFlags::printSetFlags(tty); 4040 } 4041 4042 // Apply CPU specific policy for the BiasedLocking 4043 if (UseBiasedLocking) { 4044 if (!VM_Version::use_biased_locking() && 4045 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4046 UseBiasedLocking = false; 4047 } 4048 } 4049#ifdef COMPILER2 4050 if (!UseBiasedLocking || EmitSync != 0) { 4051 UseOptoBiasInlining = false; 4052 } 4053#endif 4054 4055 return JNI_OK; 4056} 4057 4058jint Arguments::adjust_after_os() { 4059 if (UseNUMA) { 4060 if (UseParallelGC || UseParallelOldGC) { 4061 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4062 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4063 } 4064 } 4065 // UseNUMAInterleaving is set to ON for all collectors and 4066 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4067 // such as the parallel collector for Linux and Solaris will 4068 // interleave old gen and survivor spaces on top of NUMA 4069 // allocation policy for the eden space. 4070 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4071 // all platforms and ParallelGC on Windows will interleave all 4072 // of the heap spaces across NUMA nodes. 4073 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4074 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4075 } 4076 } 4077 return JNI_OK; 4078} 4079 4080int Arguments::PropertyList_count(SystemProperty* pl) { 4081 int count = 0; 4082 while(pl != NULL) { 4083 count++; 4084 pl = pl->next(); 4085 } 4086 return count; 4087} 4088 4089const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4090 assert(key != NULL, "just checking"); 4091 SystemProperty* prop; 4092 for (prop = pl; prop != NULL; prop = prop->next()) { 4093 if (strcmp(key, prop->key()) == 0) return prop->value(); 4094 } 4095 return NULL; 4096} 4097 4098const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4099 int count = 0; 4100 const char* ret_val = NULL; 4101 4102 while(pl != NULL) { 4103 if(count >= index) { 4104 ret_val = pl->key(); 4105 break; 4106 } 4107 count++; 4108 pl = pl->next(); 4109 } 4110 4111 return ret_val; 4112} 4113 4114char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4115 int count = 0; 4116 char* ret_val = NULL; 4117 4118 while(pl != NULL) { 4119 if(count >= index) { 4120 ret_val = pl->value(); 4121 break; 4122 } 4123 count++; 4124 pl = pl->next(); 4125 } 4126 4127 return ret_val; 4128} 4129 4130void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4131 SystemProperty* p = *plist; 4132 if (p == NULL) { 4133 *plist = new_p; 4134 } else { 4135 while (p->next() != NULL) { 4136 p = p->next(); 4137 } 4138 p->set_next(new_p); 4139 } 4140} 4141 4142void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 4143 if (plist == NULL) 4144 return; 4145 4146 SystemProperty* new_p = new SystemProperty(k, v, true); 4147 PropertyList_add(plist, new_p); 4148} 4149 4150// This add maintains unique property key in the list. 4151void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 4152 if (plist == NULL) 4153 return; 4154 4155 // If property key exist then update with new value. 4156 SystemProperty* prop; 4157 for (prop = *plist; prop != NULL; prop = prop->next()) { 4158 if (strcmp(k, prop->key()) == 0) { 4159 if (append) { 4160 prop->append_value(v); 4161 } else { 4162 prop->set_value(v); 4163 } 4164 return; 4165 } 4166 } 4167 4168 PropertyList_add(plist, k, v); 4169} 4170 4171// Copies src into buf, replacing "%%" with "%" and "%p" with pid 4172// Returns true if all of the source pointed by src has been copied over to 4173// the destination buffer pointed by buf. Otherwise, returns false. 4174// Notes: 4175// 1. If the length (buflen) of the destination buffer excluding the 4176// NULL terminator character is not long enough for holding the expanded 4177// pid characters, it also returns false instead of returning the partially 4178// expanded one. 4179// 2. The passed in "buflen" should be large enough to hold the null terminator. 4180bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4181 char* buf, size_t buflen) { 4182 const char* p = src; 4183 char* b = buf; 4184 const char* src_end = &src[srclen]; 4185 char* buf_end = &buf[buflen - 1]; 4186 4187 while (p < src_end && b < buf_end) { 4188 if (*p == '%') { 4189 switch (*(++p)) { 4190 case '%': // "%%" ==> "%" 4191 *b++ = *p++; 4192 break; 4193 case 'p': { // "%p" ==> current process id 4194 // buf_end points to the character before the last character so 4195 // that we could write '\0' to the end of the buffer. 4196 size_t buf_sz = buf_end - b + 1; 4197 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4198 4199 // if jio_snprintf fails or the buffer is not long enough to hold 4200 // the expanded pid, returns false. 4201 if (ret < 0 || ret >= (int)buf_sz) { 4202 return false; 4203 } else { 4204 b += ret; 4205 assert(*b == '\0', "fail in copy_expand_pid"); 4206 if (p == src_end && b == buf_end + 1) { 4207 // reach the end of the buffer. 4208 return true; 4209 } 4210 } 4211 p++; 4212 break; 4213 } 4214 default : 4215 *b++ = '%'; 4216 } 4217 } else { 4218 *b++ = *p++; 4219 } 4220 } 4221 *b = '\0'; 4222 return (p == src_end); // return false if not all of the source was copied 4223} 4224