1 /* 2 * Copyright (c) 1997, 2015, 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 #define UNSUPPORTED_GC_OPTION(gc) \ 61 do { \ 62 if (gc) { \ 63 if (FLAG_IS_CMDLINE(gc)) { \ 64 warning(#gc " is not supported in this VM. Using Serial GC."); \ 65 } \ 66 FLAG_SET_DEFAULT(gc, false); \ 67 } \ 68 } while(0) 69 70 char** Arguments::_jvm_flags_array = NULL; 71 int Arguments::_num_jvm_flags = 0; 72 char** Arguments::_jvm_args_array = NULL; 73 int Arguments::_num_jvm_args = 0; 74 char* Arguments::_java_command = NULL; 75 SystemProperty* Arguments::_system_properties = NULL; 76 const char* Arguments::_gc_log_filename = NULL; 77 bool Arguments::_has_profile = false; 78 size_t Arguments::_conservative_max_heap_alignment = 0; 79 uintx Arguments::_min_heap_size = 0; 80 uintx Arguments::_min_heap_free_ratio = 0; 81 uintx Arguments::_max_heap_free_ratio = 0; 82 Arguments::Mode Arguments::_mode = _mixed; 83 bool Arguments::_java_compiler = false; 84 bool Arguments::_xdebug_mode = false; 85 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 86 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 87 int Arguments::_sun_java_launcher_pid = -1; 88 bool Arguments::_sun_java_launcher_is_altjvm = false; 89 90 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 91 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 92 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 93 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 94 bool Arguments::_ClipInlining = ClipInlining; 95 96 char* Arguments::SharedArchivePath = NULL; 97 98 AgentLibraryList Arguments::_libraryList; 99 AgentLibraryList Arguments::_agentList; 100 101 abort_hook_t Arguments::_abort_hook = NULL; 102 exit_hook_t Arguments::_exit_hook = NULL; 103 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 104 105 106 SystemProperty *Arguments::_sun_boot_library_path = NULL; 107 SystemProperty *Arguments::_java_library_path = NULL; 108 SystemProperty *Arguments::_java_home = NULL; 109 SystemProperty *Arguments::_java_class_path = NULL; 110 SystemProperty *Arguments::_sun_boot_class_path = NULL; 111 112 char* Arguments::_ext_dirs = NULL; 113 114 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 115 // part of the option string. 116 static bool match_option(const JavaVMOption *option, const char* name, 117 const char** tail) { 118 int len = (int)strlen(name); 119 if (strncmp(option->optionString, name, len) == 0) { 120 *tail = option->optionString + len; 121 return true; 122 } else { 123 return false; 124 } 125 } 126 127 // Check if 'option' matches 'name'. No "tail" is allowed. 128 static bool match_option(const JavaVMOption *option, const char* name) { 129 const char* tail = NULL; 130 bool result = match_option(option, name, &tail); 131 if (tail != NULL && *tail == '\0') { 132 return result; 133 } else { 134 return false; 135 } 136 } 137 138 // Return true if any of the strings in null-terminated array 'names' matches. 139 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 140 // the option must match exactly. 141 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 142 bool tail_allowed) { 143 for (/* empty */; *names != NULL; ++names) { 144 if (match_option(option, *names, tail)) { 145 if (**tail == '\0' || tail_allowed && **tail == ':') { 146 return true; 147 } 148 } 149 } 150 return false; 151 } 152 153 static void logOption(const char* opt) { 154 if (PrintVMOptions) { 155 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 156 } 157 } 158 159 // Process java launcher properties. 160 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 161 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 162 // sun.java.launcher.pid is defined. 163 // Must do this before setting up other system properties, 164 // as some of them may depend on launcher type. 165 for (int index = 0; index < args->nOptions; index++) { 166 const JavaVMOption* option = args->options + index; 167 const char* tail; 168 169 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 170 process_java_launcher_argument(tail, option->extraInfo); 171 continue; 172 } 173 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 174 if (strcmp(tail, "true") == 0) { 175 _sun_java_launcher_is_altjvm = true; 176 } 177 continue; 178 } 179 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 180 _sun_java_launcher_pid = atoi(tail); 181 continue; 182 } 183 } 184 } 185 186 // Initialize system properties key and value. 187 void Arguments::init_system_properties() { 188 189 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 190 "Java Virtual Machine Specification", false)); 191 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 192 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 193 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 194 195 // Following are JVMTI agent writable properties. 196 // Properties values are set to NULL and they are 197 // os specific they are initialized in os::init_system_properties_values(). 198 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 199 _java_library_path = new SystemProperty("java.library.path", NULL, true); 200 _java_home = new SystemProperty("java.home", NULL, true); 201 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 202 203 _java_class_path = new SystemProperty("java.class.path", "", true); 204 205 // Add to System Property list. 206 PropertyList_add(&_system_properties, _sun_boot_library_path); 207 PropertyList_add(&_system_properties, _java_library_path); 208 PropertyList_add(&_system_properties, _java_home); 209 PropertyList_add(&_system_properties, _java_class_path); 210 PropertyList_add(&_system_properties, _sun_boot_class_path); 211 212 // Set OS specific system properties values 213 os::init_system_properties_values(); 214 } 215 216 217 // Update/Initialize System properties after JDK version number is known 218 void Arguments::init_version_specific_system_properties() { 219 enum { bufsz = 16 }; 220 char buffer[bufsz]; 221 const char* spec_vendor = "Sun Microsystems Inc."; 222 uint32_t spec_version = 0; 223 224 spec_vendor = "Oracle Corporation"; 225 spec_version = JDK_Version::current().major_version(); 226 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 227 228 PropertyList_add(&_system_properties, 229 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 230 PropertyList_add(&_system_properties, 231 new SystemProperty("java.vm.specification.version", buffer, false)); 232 PropertyList_add(&_system_properties, 233 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 234 } 235 236 /** 237 * Provide a slightly more user-friendly way of eliminating -XX flags. 238 * When a flag is eliminated, it can be added to this list in order to 239 * continue accepting this flag on the command-line, while issuing a warning 240 * and ignoring the value. Once the JDK version reaches the 'accept_until' 241 * limit, we flatly refuse to admit the existence of the flag. This allows 242 * a flag to die correctly over JDK releases using HSX. 243 */ 244 typedef struct { 245 const char* name; 246 JDK_Version obsoleted_in; // when the flag went away 247 JDK_Version accept_until; // which version to start denying the existence 248 } ObsoleteFlag; 249 250 static ObsoleteFlag obsolete_jvm_flags[] = { 251 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 252 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 253 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 254 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 255 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 256 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 257 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 258 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 259 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 260 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 261 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 262 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 263 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 264 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 265 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 266 { "DefaultInitialRAMFraction", 267 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 268 { "UseDepthFirstScavengeOrder", 269 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 270 { "HandlePromotionFailure", 271 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 272 { "MaxLiveObjectEvacuationRatio", 273 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 274 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 275 { "UseParallelOldGCCompacting", 276 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 277 { "UseParallelDensePrefixUpdate", 278 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 279 { "UseParallelOldGCDensePrefix", 280 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 281 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 282 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 283 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 284 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 285 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 286 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 287 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 288 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 289 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 290 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 291 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 292 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 293 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 294 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 295 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 296 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 297 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 298 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 299 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 300 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 301 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 302 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 303 #ifdef PRODUCT 304 { "DesiredMethodLimit", 305 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 306 #endif // PRODUCT 307 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 308 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 309 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 310 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 311 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 312 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 313 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) }, 314 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 315 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 316 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 317 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 318 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 319 #ifndef ZERO 320 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 321 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 322 #endif // ZERO 323 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 324 { NULL, JDK_Version(0), JDK_Version(0) } 325 }; 326 327 // Returns true if the flag is obsolete and fits into the range specified 328 // for being ignored. In the case that the flag is ignored, the 'version' 329 // value is filled in with the version number when the flag became 330 // obsolete so that that value can be displayed to the user. 331 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 332 int i = 0; 333 assert(version != NULL, "Must provide a version buffer"); 334 while (obsolete_jvm_flags[i].name != NULL) { 335 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 336 // <flag>=xxx form 337 // [-|+]<flag> form 338 size_t len = strlen(flag_status.name); 339 if (((strncmp(flag_status.name, s, len) == 0) && 340 (strlen(s) == len)) || 341 ((s[0] == '+' || s[0] == '-') && 342 (strncmp(flag_status.name, &s[1], len) == 0) && 343 (strlen(&s[1]) == len))) { 344 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 345 *version = flag_status.obsoleted_in; 346 return true; 347 } 348 } 349 i++; 350 } 351 return false; 352 } 353 354 // Constructs the system class path (aka boot class path) from the following 355 // components, in order: 356 // 357 // prefix // from -Xbootclasspath/p:... 358 // base // from os::get_system_properties() or -Xbootclasspath= 359 // suffix // from -Xbootclasspath/a:... 360 // 361 // This could be AllStatic, but it isn't needed after argument processing is 362 // complete. 363 class SysClassPath: public StackObj { 364 public: 365 SysClassPath(const char* base); 366 ~SysClassPath(); 367 368 inline void set_base(const char* base); 369 inline void add_prefix(const char* prefix); 370 inline void add_suffix_to_prefix(const char* suffix); 371 inline void add_suffix(const char* suffix); 372 inline void reset_path(const char* base); 373 374 inline const char* get_base() const { return _items[_scp_base]; } 375 inline const char* get_prefix() const { return _items[_scp_prefix]; } 376 inline const char* get_suffix() const { return _items[_scp_suffix]; } 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(); 381 382 private: 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_base, // the default sysclasspath 394 _scp_suffix, // from -Xbootclasspath/a:... 395 _scp_nitems // the number of items, must be last. 396 }; 397 398 const char* _items[_scp_nitems]; 399 }; 400 401 SysClassPath::SysClassPath(const char* base) { 402 memset(_items, 0, sizeof(_items)); 403 _items[_scp_base] = base; 404 } 405 406 SysClassPath::~SysClassPath() { 407 // Free everything except the base. 408 for (int i = 0; i < _scp_nitems; ++i) { 409 if (i != _scp_base) reset_item_at(i); 410 } 411 } 412 413 inline void SysClassPath::set_base(const char* base) { 414 _items[_scp_base] = base; 415 } 416 417 inline void SysClassPath::add_prefix(const char* prefix) { 418 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 419 } 420 421 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 422 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 423 } 424 425 inline void SysClassPath::add_suffix(const char* suffix) { 426 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 427 } 428 429 inline void SysClassPath::reset_item_at(int index) { 430 assert(index < _scp_nitems && index != _scp_base, "just checking"); 431 if (_items[index] != NULL) { 432 FREE_C_HEAP_ARRAY(char, _items[index]); 433 _items[index] = NULL; 434 } 435 } 436 437 inline void SysClassPath::reset_path(const char* base) { 438 // Clear the prefix and suffix. 439 reset_item_at(_scp_prefix); 440 reset_item_at(_scp_suffix); 441 set_base(base); 442 } 443 444 //------------------------------------------------------------------------------ 445 446 447 // Combine the bootclasspath elements, some of which may be null, into a single 448 // c-heap-allocated string. 449 char* SysClassPath::combined_path() { 450 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 451 452 size_t lengths[_scp_nitems]; 453 size_t total_len = 0; 454 455 const char separator = *os::path_separator(); 456 457 // Get the lengths. 458 int i; 459 for (i = 0; i < _scp_nitems; ++i) { 460 if (_items[i] != NULL) { 461 lengths[i] = strlen(_items[i]); 462 // Include space for the separator char (or a NULL for the last item). 463 total_len += lengths[i] + 1; 464 } 465 } 466 assert(total_len > 0, "empty sysclasspath not allowed"); 467 468 // Copy the _items to a single string. 469 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 470 char* cp_tmp = cp; 471 for (i = 0; i < _scp_nitems; ++i) { 472 if (_items[i] != NULL) { 473 memcpy(cp_tmp, _items[i], lengths[i]); 474 cp_tmp += lengths[i]; 475 *cp_tmp++ = separator; 476 } 477 } 478 *--cp_tmp = '\0'; // Replace the extra separator. 479 return cp; 480 } 481 482 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 483 char* 484 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 485 char *cp; 486 487 assert(str != NULL, "just checking"); 488 if (path == NULL) { 489 size_t len = strlen(str) + 1; 490 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 491 memcpy(cp, str, len); // copy the trailing null 492 } else { 493 const char separator = *os::path_separator(); 494 size_t old_len = strlen(path); 495 size_t str_len = strlen(str); 496 size_t len = old_len + str_len + 2; 497 498 if (prepend) { 499 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 500 char* cp_tmp = cp; 501 memcpy(cp_tmp, str, str_len); 502 cp_tmp += str_len; 503 *cp_tmp = separator; 504 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 505 FREE_C_HEAP_ARRAY(char, path); 506 } else { 507 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 508 char* cp_tmp = cp + old_len; 509 *cp_tmp = separator; 510 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 511 } 512 } 513 return cp; 514 } 515 516 // Scan the directory and append any jar or zip files found to path. 517 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 518 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 519 DIR* dir = os::opendir(directory); 520 if (dir == NULL) return path; 521 522 char dir_sep[2] = { '\0', '\0' }; 523 size_t directory_len = strlen(directory); 524 const char fileSep = *os::file_separator(); 525 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 526 527 /* Scan the directory for jars/zips, appending them to path. */ 528 struct dirent *entry; 529 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 530 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 531 const char* name = entry->d_name; 532 const char* ext = name + strlen(name) - 4; 533 bool isJarOrZip = ext > name && 534 (os::file_name_strcmp(ext, ".jar") == 0 || 535 os::file_name_strcmp(ext, ".zip") == 0); 536 if (isJarOrZip) { 537 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 538 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 539 path = add_to_path(path, jarpath, false); 540 FREE_C_HEAP_ARRAY(char, jarpath); 541 } 542 } 543 FREE_C_HEAP_ARRAY(char, dbuf); 544 os::closedir(dir); 545 return path; 546 } 547 548 // Parses a memory size specification string. 549 static bool atomull(const char *s, julong* result) { 550 julong n = 0; 551 int args_read = 0; 552 bool is_hex = false; 553 // Skip leading 0[xX] for hexadecimal 554 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) { 555 s += 2; 556 is_hex = true; 557 args_read = sscanf(s, JULONG_FORMAT_X, &n); 558 } else { 559 args_read = sscanf(s, JULONG_FORMAT, &n); 560 } 561 if (args_read != 1) { 562 return false; 563 } 564 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) { 565 s++; 566 } 567 // 4705540: illegal if more characters are found after the first non-digit 568 if (strlen(s) > 1) { 569 return false; 570 } 571 switch (*s) { 572 case 'T': case 't': 573 *result = n * G * K; 574 // Check for overflow. 575 if (*result/((julong)G * K) != n) return false; 576 return true; 577 case 'G': case 'g': 578 *result = n * G; 579 if (*result/G != n) return false; 580 return true; 581 case 'M': case 'm': 582 *result = n * M; 583 if (*result/M != n) return false; 584 return true; 585 case 'K': case 'k': 586 *result = n * K; 587 if (*result/K != n) return false; 588 return true; 589 case '\0': 590 *result = n; 591 return true; 592 default: 593 return false; 594 } 595 } 596 597 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 598 if (size < min_size) return arg_too_small; 599 // Check that size will fit in a size_t (only relevant on 32-bit) 600 if (size > max_uintx) return arg_too_big; 601 return arg_in_range; 602 } 603 604 // Describe an argument out of range error 605 void Arguments::describe_range_error(ArgsRange errcode) { 606 switch(errcode) { 607 case arg_too_big: 608 jio_fprintf(defaultStream::error_stream(), 609 "The specified size exceeds the maximum " 610 "representable size.\n"); 611 break; 612 case arg_too_small: 613 case arg_unreadable: 614 case arg_in_range: 615 // do nothing for now 616 break; 617 default: 618 ShouldNotReachHere(); 619 } 620 } 621 622 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) { 623 return CommandLineFlags::boolAtPut(name, &value, origin); 624 } 625 626 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 627 double v; 628 if (sscanf(value, "%lf", &v) != 1) { 629 return false; 630 } 631 632 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 633 return true; 634 } 635 return false; 636 } 637 638 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 639 julong v; 640 intx intx_v; 641 bool is_neg = false; 642 // Check the sign first since atomull() parses only unsigned values. 643 if (*value == '-') { 644 if (!CommandLineFlags::intxAt(name, &intx_v)) { 645 return false; 646 } 647 value++; 648 is_neg = true; 649 } 650 if (!atomull(value, &v)) { 651 return false; 652 } 653 intx_v = (intx) v; 654 if (is_neg) { 655 intx_v = -intx_v; 656 } 657 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 658 return true; 659 } 660 uintx uintx_v = (uintx) v; 661 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 662 return true; 663 } 664 uint64_t uint64_t_v = (uint64_t) v; 665 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 666 return true; 667 } 668 size_t size_t_v = (size_t) v; 669 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) { 670 return true; 671 } 672 return false; 673 } 674 675 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 676 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 677 // Contract: CommandLineFlags always returns a pointer that needs freeing. 678 FREE_C_HEAP_ARRAY(char, value); 679 return true; 680 } 681 682 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 683 const char* old_value = ""; 684 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 685 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 686 size_t new_len = strlen(new_value); 687 const char* value; 688 char* free_this_too = NULL; 689 if (old_len == 0) { 690 value = new_value; 691 } else if (new_len == 0) { 692 value = old_value; 693 } else { 694 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 695 // each new setting adds another LINE to the switch: 696 sprintf(buf, "%s\n%s", old_value, new_value); 697 value = buf; 698 free_this_too = buf; 699 } 700 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 701 // CommandLineFlags always returns a pointer that needs freeing. 702 FREE_C_HEAP_ARRAY(char, value); 703 if (free_this_too != NULL) { 704 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 705 FREE_C_HEAP_ARRAY(char, free_this_too); 706 } 707 return true; 708 } 709 710 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 711 712 // range of acceptable characters spelled out for portability reasons 713 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 714 #define BUFLEN 255 715 char name[BUFLEN+1]; 716 char dummy; 717 718 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 719 return set_bool_flag(name, false, origin); 720 } 721 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 722 return set_bool_flag(name, true, origin); 723 } 724 725 char punct; 726 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 727 const char* value = strchr(arg, '=') + 1; 728 Flag* flag = Flag::find_flag(name, strlen(name)); 729 if (flag != NULL && flag->is_ccstr()) { 730 if (flag->ccstr_accumulates()) { 731 return append_to_string_flag(name, value, origin); 732 } else { 733 if (value[0] == '\0') { 734 value = NULL; 735 } 736 return set_string_flag(name, value, origin); 737 } 738 } 739 } 740 741 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 742 const char* value = strchr(arg, '=') + 1; 743 // -XX:Foo:=xxx will reset the string flag to the given value. 744 if (value[0] == '\0') { 745 value = NULL; 746 } 747 return set_string_flag(name, value, origin); 748 } 749 750 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 751 #define SIGNED_NUMBER_RANGE "[-0123456789]" 752 #define NUMBER_RANGE "[0123456789]" 753 char value[BUFLEN + 1]; 754 char value2[BUFLEN + 1]; 755 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 756 // Looks like a floating-point number -- try again with more lenient format string 757 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 758 return set_fp_numeric_flag(name, value, origin); 759 } 760 } 761 762 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 763 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 764 return set_numeric_flag(name, value, origin); 765 } 766 767 return false; 768 } 769 770 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 771 assert(bldarray != NULL, "illegal argument"); 772 773 if (arg == NULL) { 774 return; 775 } 776 777 int new_count = *count + 1; 778 779 // expand the array and add arg to the last element 780 if (*bldarray == NULL) { 781 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 782 } else { 783 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 784 } 785 (*bldarray)[*count] = os::strdup_check_oom(arg); 786 *count = new_count; 787 } 788 789 void Arguments::build_jvm_args(const char* arg) { 790 add_string(&_jvm_args_array, &_num_jvm_args, arg); 791 } 792 793 void Arguments::build_jvm_flags(const char* arg) { 794 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 795 } 796 797 // utility function to return a string that concatenates all 798 // strings in a given char** array 799 const char* Arguments::build_resource_string(char** args, int count) { 800 if (args == NULL || count == 0) { 801 return NULL; 802 } 803 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 804 for (int i = 1; i < count; i++) { 805 length += strlen(args[i]) + 1; // add 1 for a space 806 } 807 char* s = NEW_RESOURCE_ARRAY(char, length); 808 strcpy(s, args[0]); 809 for (int j = 1; j < count; j++) { 810 strcat(s, " "); 811 strcat(s, args[j]); 812 } 813 return (const char*) s; 814 } 815 816 void Arguments::print_on(outputStream* st) { 817 st->print_cr("VM Arguments:"); 818 if (num_jvm_flags() > 0) { 819 st->print("jvm_flags: "); print_jvm_flags_on(st); 820 } 821 if (num_jvm_args() > 0) { 822 st->print("jvm_args: "); print_jvm_args_on(st); 823 } 824 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 825 if (_java_class_path != NULL) { 826 char* path = _java_class_path->value(); 827 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 828 } 829 st->print_cr("Launcher Type: %s", _sun_java_launcher); 830 } 831 832 void Arguments::print_jvm_flags_on(outputStream* st) { 833 if (_num_jvm_flags > 0) { 834 for (int i=0; i < _num_jvm_flags; i++) { 835 st->print("%s ", _jvm_flags_array[i]); 836 } 837 st->cr(); 838 } 839 } 840 841 void Arguments::print_jvm_args_on(outputStream* st) { 842 if (_num_jvm_args > 0) { 843 for (int i=0; i < _num_jvm_args; i++) { 844 st->print("%s ", _jvm_args_array[i]); 845 } 846 st->cr(); 847 } 848 } 849 850 bool Arguments::process_argument(const char* arg, 851 jboolean ignore_unrecognized, Flag::Flags origin) { 852 853 JDK_Version since = JDK_Version(); 854 855 if (parse_argument(arg, origin) || ignore_unrecognized) { 856 return true; 857 } 858 859 bool has_plus_minus = (*arg == '+' || *arg == '-'); 860 const char* const argname = has_plus_minus ? arg + 1 : arg; 861 if (is_newly_obsolete(arg, &since)) { 862 char version[256]; 863 since.to_string(version, sizeof(version)); 864 warning("ignoring option %s; support was removed in %s", argname, version); 865 return true; 866 } 867 868 // For locked flags, report a custom error message if available. 869 // Otherwise, report the standard unrecognized VM option. 870 871 size_t arg_len; 872 const char* equal_sign = strchr(argname, '='); 873 if (equal_sign == NULL) { 874 arg_len = strlen(argname); 875 } else { 876 arg_len = equal_sign - argname; 877 } 878 879 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 880 if (found_flag != NULL) { 881 char locked_message_buf[BUFLEN]; 882 found_flag->get_locked_message(locked_message_buf, BUFLEN); 883 if (strlen(locked_message_buf) == 0) { 884 if (found_flag->is_bool() && !has_plus_minus) { 885 jio_fprintf(defaultStream::error_stream(), 886 "Missing +/- setting for VM option '%s'\n", argname); 887 } else if (!found_flag->is_bool() && has_plus_minus) { 888 jio_fprintf(defaultStream::error_stream(), 889 "Unexpected +/- setting in VM option '%s'\n", argname); 890 } else { 891 jio_fprintf(defaultStream::error_stream(), 892 "Improperly specified VM option '%s'\n", argname); 893 } 894 } else { 895 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 896 } 897 } else { 898 jio_fprintf(defaultStream::error_stream(), 899 "Unrecognized VM option '%s'\n", argname); 900 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 901 if (fuzzy_matched != NULL) { 902 jio_fprintf(defaultStream::error_stream(), 903 "Did you mean '%s%s%s'? ", 904 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 905 fuzzy_matched->_name, 906 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 907 if (is_newly_obsolete(fuzzy_matched->_name, &since)) { 908 char version[256]; 909 since.to_string(version, sizeof(version)); 910 jio_fprintf(defaultStream::error_stream(), 911 "Warning: support for %s was removed in %s\n", 912 fuzzy_matched->_name, 913 version); 914 } 915 } 916 } 917 918 // allow for commandline "commenting out" options like -XX:#+Verbose 919 return arg[0] == '#'; 920 } 921 922 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 923 FILE* stream = fopen(file_name, "rb"); 924 if (stream == NULL) { 925 if (should_exist) { 926 jio_fprintf(defaultStream::error_stream(), 927 "Could not open settings file %s\n", file_name); 928 return false; 929 } else { 930 return true; 931 } 932 } 933 934 char token[1024]; 935 int pos = 0; 936 937 bool in_white_space = true; 938 bool in_comment = false; 939 bool in_quote = false; 940 char quote_c = 0; 941 bool result = true; 942 943 int c = getc(stream); 944 while(c != EOF && pos < (int)(sizeof(token)-1)) { 945 if (in_white_space) { 946 if (in_comment) { 947 if (c == '\n') in_comment = false; 948 } else { 949 if (c == '#') in_comment = true; 950 else if (!isspace(c)) { 951 in_white_space = false; 952 token[pos++] = c; 953 } 954 } 955 } else { 956 if (c == '\n' || (!in_quote && isspace(c))) { 957 // token ends at newline, or at unquoted whitespace 958 // this allows a way to include spaces in string-valued options 959 token[pos] = '\0'; 960 logOption(token); 961 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 962 build_jvm_flags(token); 963 pos = 0; 964 in_white_space = true; 965 in_quote = false; 966 } else if (!in_quote && (c == '\'' || c == '"')) { 967 in_quote = true; 968 quote_c = c; 969 } else if (in_quote && (c == quote_c)) { 970 in_quote = false; 971 } else { 972 token[pos++] = c; 973 } 974 } 975 c = getc(stream); 976 } 977 if (pos > 0) { 978 token[pos] = '\0'; 979 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 980 build_jvm_flags(token); 981 } 982 fclose(stream); 983 return result; 984 } 985 986 //============================================================================================================= 987 // Parsing of properties (-D) 988 989 const char* Arguments::get_property(const char* key) { 990 return PropertyList_get_value(system_properties(), key); 991 } 992 993 bool Arguments::add_property(const char* prop) { 994 const char* eq = strchr(prop, '='); 995 char* key; 996 // ns must be static--its address may be stored in a SystemProperty object. 997 const static char ns[1] = {0}; 998 char* value = (char *)ns; 999 1000 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 1001 key = AllocateHeap(key_len + 1, mtInternal); 1002 strncpy(key, prop, key_len); 1003 key[key_len] = '\0'; 1004 1005 if (eq != NULL) { 1006 size_t value_len = strlen(prop) - key_len - 1; 1007 value = AllocateHeap(value_len + 1, mtInternal); 1008 strncpy(value, &prop[key_len + 1], value_len + 1); 1009 } 1010 1011 if (strcmp(key, "java.compiler") == 0) { 1012 process_java_compiler_argument(value); 1013 FreeHeap(key); 1014 if (eq != NULL) { 1015 FreeHeap(value); 1016 } 1017 return true; 1018 } else if (strcmp(key, "sun.java.command") == 0) { 1019 _java_command = value; 1020 1021 // Record value in Arguments, but let it get passed to Java. 1022 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1023 strcmp(key, "sun.java.launcher.pid") == 0) { 1024 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1025 // private and are processed in process_sun_java_launcher_properties(); 1026 // the sun.java.launcher property is passed on to the java application 1027 FreeHeap(key); 1028 if (eq != NULL) { 1029 FreeHeap(value); 1030 } 1031 return true; 1032 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1033 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1034 // its value without going through the property list or making a Java call. 1035 _java_vendor_url_bug = value; 1036 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1037 PropertyList_unique_add(&_system_properties, key, value, true); 1038 return true; 1039 } 1040 // Create new property and add at the end of the list 1041 PropertyList_unique_add(&_system_properties, key, value); 1042 return true; 1043 } 1044 1045 //=========================================================================================================== 1046 // Setting int/mixed/comp mode flags 1047 1048 void Arguments::set_mode_flags(Mode mode) { 1049 // Set up default values for all flags. 1050 // If you add a flag to any of the branches below, 1051 // add a default value for it here. 1052 set_java_compiler(false); 1053 _mode = mode; 1054 1055 // Ensure Agent_OnLoad has the correct initial values. 1056 // This may not be the final mode; mode may change later in onload phase. 1057 PropertyList_unique_add(&_system_properties, "java.vm.info", 1058 (char*)VM_Version::vm_info_string(), false); 1059 1060 UseInterpreter = true; 1061 UseCompiler = true; 1062 UseLoopCounter = true; 1063 1064 // Default values may be platform/compiler dependent - 1065 // use the saved values 1066 ClipInlining = Arguments::_ClipInlining; 1067 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1068 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1069 BackgroundCompilation = Arguments::_BackgroundCompilation; 1070 1071 // Change from defaults based on mode 1072 switch (mode) { 1073 default: 1074 ShouldNotReachHere(); 1075 break; 1076 case _int: 1077 UseCompiler = false; 1078 UseLoopCounter = false; 1079 AlwaysCompileLoopMethods = false; 1080 UseOnStackReplacement = false; 1081 break; 1082 case _mixed: 1083 // same as default 1084 break; 1085 case _comp: 1086 UseInterpreter = false; 1087 BackgroundCompilation = false; 1088 ClipInlining = false; 1089 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1090 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1091 // compile a level 4 (C2) and then continue executing it. 1092 if (TieredCompilation) { 1093 Tier3InvokeNotifyFreqLog = 0; 1094 Tier4InvocationThreshold = 0; 1095 } 1096 break; 1097 } 1098 } 1099 1100 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1101 // Conflict: required to use shared spaces (-Xshare:on), but 1102 // incompatible command line options were chosen. 1103 1104 static void no_shared_spaces(const char* message) { 1105 if (RequireSharedSpaces) { 1106 jio_fprintf(defaultStream::error_stream(), 1107 "Class data sharing is inconsistent with other specified options.\n"); 1108 vm_exit_during_initialization("Unable to use shared archive.", message); 1109 } else { 1110 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1111 } 1112 } 1113 #endif 1114 1115 // Returns threshold scaled with the value of scale. 1116 // If scale < 0.0, threshold is returned without scaling. 1117 intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1118 if (scale == 1.0 || scale < 0.0) { 1119 return threshold; 1120 } else { 1121 return (intx)(threshold * scale); 1122 } 1123 } 1124 1125 // Returns freq_log scaled with the value of scale. 1126 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1127 // If scale < 0.0, freq_log is returned without scaling. 1128 intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1129 // Check if scaling is necessary or if negative value was specified. 1130 if (scale == 1.0 || scale < 0.0) { 1131 return freq_log; 1132 } 1133 // Check values to avoid calculating log2 of 0. 1134 if (scale == 0.0 || freq_log == 0) { 1135 return 0; 1136 } 1137 // Determine the maximum notification frequency value currently supported. 1138 // The largest mask value that the interpreter/C1 can handle is 1139 // of length InvocationCounter::number_of_count_bits. Mask values are always 1140 // one bit shorter then the value of the notification frequency. Set 1141 // max_freq_bits accordingly. 1142 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1143 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1144 if (scaled_freq == 0) { 1145 // Return 0 right away to avoid calculating log2 of 0. 1146 return 0; 1147 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1148 return max_freq_bits; 1149 } else { 1150 return log2_intptr(scaled_freq); 1151 } 1152 } 1153 1154 void Arguments::set_tiered_flags() { 1155 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1156 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1157 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1158 } 1159 if (CompilationPolicyChoice < 2) { 1160 vm_exit_during_initialization( 1161 "Incompatible compilation policy selected", NULL); 1162 } 1163 // Increase the code cache size - tiered compiles a lot more. 1164 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1165 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1166 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1167 } 1168 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1169 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1170 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1171 1172 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1173 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap) 1174 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) { 1175 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1176 } 1177 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) { 1178 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1179 } 1180 // Check consistency of code heap sizes 1181 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 1182 jio_fprintf(defaultStream::error_stream(), 1183 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 1184 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 1185 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 1186 vm_exit(1); 1187 } 1188 } 1189 } 1190 if (!UseInterpreter) { // -Xcomp 1191 Tier3InvokeNotifyFreqLog = 0; 1192 Tier4InvocationThreshold = 0; 1193 } 1194 1195 if (CompileThresholdScaling < 0) { 1196 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1197 } 1198 1199 // Scale tiered compilation thresholds. 1200 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1201 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1202 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1203 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1204 1205 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1206 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1207 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1208 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1209 1210 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1211 // once these thresholds become supported. 1212 1213 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1214 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1215 1216 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1217 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1218 1219 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1220 1221 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1222 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1223 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1224 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1225 } 1226 } 1227 1228 /** 1229 * Returns the minimum number of compiler threads needed to run the JVM. The following 1230 * configurations are possible. 1231 * 1232 * 1) The JVM is build using an interpreter only. As a result, the minimum number of 1233 * compiler threads is 0. 1234 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As 1235 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1. 1236 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However, 1237 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only 1238 * C1 can be used, so the minimum number of compiler threads is 1. 1239 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option 1240 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result, 1241 * the minimum number of compiler threads is 2. 1242 */ 1243 int Arguments::get_min_number_of_compiler_threads() { 1244 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 1245 return 0; // case 1 1246 #else 1247 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) { 1248 return 1; // case 2 or case 3 1249 } 1250 return 2; // case 4 (tiered) 1251 #endif 1252 } 1253 1254 #if INCLUDE_ALL_GCS 1255 static void disable_adaptive_size_policy(const char* collector_name) { 1256 if (UseAdaptiveSizePolicy) { 1257 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1258 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1259 collector_name); 1260 } 1261 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1262 } 1263 } 1264 1265 void Arguments::set_parnew_gc_flags() { 1266 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1267 "control point invariant"); 1268 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1269 assert(UseParNewGC, "ParNew should always be used with CMS"); 1270 1271 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1272 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1273 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1274 } else if (ParallelGCThreads == 0) { 1275 jio_fprintf(defaultStream::error_stream(), 1276 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1277 vm_exit(1); 1278 } 1279 1280 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1281 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1282 // we set them to 1024 and 1024. 1283 // See CR 6362902. 1284 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1285 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1286 } 1287 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1288 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1289 } 1290 1291 // When using compressed oops, we use local overflow stacks, 1292 // rather than using a global overflow list chained through 1293 // the klass word of the object's pre-image. 1294 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1295 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1296 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1297 } 1298 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1299 } 1300 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1301 } 1302 1303 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1304 // sparc/solaris for certain applications, but would gain from 1305 // further optimization and tuning efforts, and would almost 1306 // certainly gain from analysis of platform and environment. 1307 void Arguments::set_cms_and_parnew_gc_flags() { 1308 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1309 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1310 assert(UseParNewGC, "ParNew should always be used with CMS"); 1311 1312 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1313 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1314 1315 set_parnew_gc_flags(); 1316 1317 size_t max_heap = align_size_down(MaxHeapSize, 1318 CardTableRS::ct_max_alignment_constraint()); 1319 1320 // Now make adjustments for CMS 1321 intx tenuring_default = (intx)6; 1322 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1323 1324 // Preferred young gen size for "short" pauses: 1325 // upper bound depends on # of threads and NewRatio. 1326 const uintx parallel_gc_threads = 1327 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1328 const size_t preferred_max_new_size_unaligned = 1329 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1330 size_t preferred_max_new_size = 1331 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1332 1333 // Unless explicitly requested otherwise, size young gen 1334 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1335 1336 // If either MaxNewSize or NewRatio is set on the command line, 1337 // assume the user is trying to set the size of the young gen. 1338 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1339 1340 // Set MaxNewSize to our calculated preferred_max_new_size unless 1341 // NewSize was set on the command line and it is larger than 1342 // preferred_max_new_size. 1343 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1344 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1345 } else { 1346 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1347 } 1348 if (PrintGCDetails && Verbose) { 1349 // Too early to use gclog_or_tty 1350 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1351 } 1352 1353 // Code along this path potentially sets NewSize and OldSize 1354 if (PrintGCDetails && Verbose) { 1355 // Too early to use gclog_or_tty 1356 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1357 " initial_heap_size: " SIZE_FORMAT 1358 " max_heap: " SIZE_FORMAT, 1359 min_heap_size(), InitialHeapSize, max_heap); 1360 } 1361 size_t min_new = preferred_max_new_size; 1362 if (FLAG_IS_CMDLINE(NewSize)) { 1363 min_new = NewSize; 1364 } 1365 if (max_heap > min_new && min_heap_size() > min_new) { 1366 // Unless explicitly requested otherwise, make young gen 1367 // at least min_new, and at most preferred_max_new_size. 1368 if (FLAG_IS_DEFAULT(NewSize)) { 1369 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1370 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1371 if (PrintGCDetails && Verbose) { 1372 // Too early to use gclog_or_tty 1373 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1374 } 1375 } 1376 // Unless explicitly requested otherwise, size old gen 1377 // so it's NewRatio x of NewSize. 1378 if (FLAG_IS_DEFAULT(OldSize)) { 1379 if (max_heap > NewSize) { 1380 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1381 if (PrintGCDetails && Verbose) { 1382 // Too early to use gclog_or_tty 1383 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1384 } 1385 } 1386 } 1387 } 1388 } 1389 // Unless explicitly requested otherwise, definitely 1390 // promote all objects surviving "tenuring_default" scavenges. 1391 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1392 FLAG_IS_DEFAULT(SurvivorRatio)) { 1393 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1394 } 1395 // If we decided above (or user explicitly requested) 1396 // `promote all' (via MaxTenuringThreshold := 0), 1397 // prefer minuscule survivor spaces so as not to waste 1398 // space for (non-existent) survivors 1399 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1400 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1401 } 1402 1403 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1404 // but rather the number of free blocks of a given size that are used when 1405 // replenishing the local per-worker free list caches. 1406 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1407 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1408 // OldPLAB sizing manually turned off: Use a larger default setting, 1409 // unless it was manually specified. This is because a too-low value 1410 // will slow down scavenges. 1411 FLAG_SET_ERGO(uintx, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166 1412 } else { 1413 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1414 } 1415 } 1416 1417 // If either of the static initialization defaults have changed, note this 1418 // modification. 1419 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1420 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1421 } 1422 if (PrintGCDetails && Verbose) { 1423 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1424 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1425 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1426 } 1427 } 1428 #endif // INCLUDE_ALL_GCS 1429 1430 void set_object_alignment() { 1431 // Object alignment. 1432 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1433 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1434 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1435 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1436 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1437 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1438 1439 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1440 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1441 1442 // Oop encoding heap max 1443 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1444 1445 #if INCLUDE_ALL_GCS 1446 // Set CMS global values 1447 CompactibleFreeListSpace::set_cms_values(); 1448 #endif // INCLUDE_ALL_GCS 1449 } 1450 1451 bool verify_object_alignment() { 1452 // Object alignment. 1453 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1454 jio_fprintf(defaultStream::error_stream(), 1455 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1456 (int)ObjectAlignmentInBytes); 1457 return false; 1458 } 1459 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1460 jio_fprintf(defaultStream::error_stream(), 1461 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1462 (int)ObjectAlignmentInBytes, BytesPerLong); 1463 return false; 1464 } 1465 // It does not make sense to have big object alignment 1466 // since a space lost due to alignment will be greater 1467 // then a saved space from compressed oops. 1468 if ((int)ObjectAlignmentInBytes > 256) { 1469 jio_fprintf(defaultStream::error_stream(), 1470 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1471 (int)ObjectAlignmentInBytes); 1472 return false; 1473 } 1474 // In case page size is very small. 1475 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1476 jio_fprintf(defaultStream::error_stream(), 1477 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1478 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1479 return false; 1480 } 1481 if(SurvivorAlignmentInBytes == 0) { 1482 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1483 } else { 1484 if (!is_power_of_2(SurvivorAlignmentInBytes)) { 1485 jio_fprintf(defaultStream::error_stream(), 1486 "error: SurvivorAlignmentInBytes=%d must be power of 2\n", 1487 (int)SurvivorAlignmentInBytes); 1488 return false; 1489 } 1490 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) { 1491 jio_fprintf(defaultStream::error_stream(), 1492 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n", 1493 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes); 1494 return false; 1495 } 1496 } 1497 return true; 1498 } 1499 1500 size_t Arguments::max_heap_for_compressed_oops() { 1501 // Avoid sign flip. 1502 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1503 // We need to fit both the NULL page and the heap into the memory budget, while 1504 // keeping alignment constraints of the heap. To guarantee the latter, as the 1505 // NULL page is located before the heap, we pad the NULL page to the conservative 1506 // maximum alignment that the GC may ever impose upon the heap. 1507 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1508 _conservative_max_heap_alignment); 1509 1510 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1511 NOT_LP64(ShouldNotReachHere(); return 0); 1512 } 1513 1514 bool Arguments::should_auto_select_low_pause_collector() { 1515 if (UseAutoGCSelectPolicy && 1516 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1517 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1518 if (PrintGCDetails) { 1519 // Cannot use gclog_or_tty yet. 1520 tty->print_cr("Automatic selection of the low pause collector" 1521 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1522 } 1523 return true; 1524 } 1525 return false; 1526 } 1527 1528 void Arguments::set_use_compressed_oops() { 1529 #ifndef ZERO 1530 #ifdef _LP64 1531 // MaxHeapSize is not set up properly at this point, but 1532 // the only value that can override MaxHeapSize if we are 1533 // to use UseCompressedOops is InitialHeapSize. 1534 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1535 1536 if (max_heap_size <= max_heap_for_compressed_oops()) { 1537 #if !defined(COMPILER1) || defined(TIERED) 1538 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1539 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1540 } 1541 #endif 1542 } else { 1543 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1544 warning("Max heap size too large for Compressed Oops"); 1545 FLAG_SET_DEFAULT(UseCompressedOops, false); 1546 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1547 } 1548 } 1549 #endif // _LP64 1550 #endif // ZERO 1551 } 1552 1553 1554 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1555 // set_use_compressed_oops(). 1556 void Arguments::set_use_compressed_klass_ptrs() { 1557 #ifndef ZERO 1558 #ifdef _LP64 1559 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1560 if (!UseCompressedOops) { 1561 if (UseCompressedClassPointers) { 1562 warning("UseCompressedClassPointers requires UseCompressedOops"); 1563 } 1564 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1565 } else { 1566 // Turn on UseCompressedClassPointers too 1567 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1568 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1569 } 1570 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1571 if (UseCompressedClassPointers) { 1572 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1573 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1574 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1575 } 1576 } 1577 } 1578 #endif // _LP64 1579 #endif // !ZERO 1580 } 1581 1582 void Arguments::set_conservative_max_heap_alignment() { 1583 // The conservative maximum required alignment for the heap is the maximum of 1584 // the alignments imposed by several sources: any requirements from the heap 1585 // itself, the collector policy and the maximum page size we may run the VM 1586 // with. 1587 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1588 #if INCLUDE_ALL_GCS 1589 if (UseParallelGC) { 1590 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1591 } else if (UseG1GC) { 1592 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1593 } 1594 #endif // INCLUDE_ALL_GCS 1595 _conservative_max_heap_alignment = MAX4(heap_alignment, 1596 (size_t)os::vm_allocation_granularity(), 1597 os::max_page_size(), 1598 CollectorPolicy::compute_heap_alignment()); 1599 } 1600 1601 void Arguments::select_gc_ergonomically() { 1602 if (os::is_server_class_machine()) { 1603 if (should_auto_select_low_pause_collector()) { 1604 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1605 } else { 1606 FLAG_SET_ERGO(bool, UseParallelGC, true); 1607 } 1608 } 1609 } 1610 1611 void Arguments::select_gc() { 1612 if (!gc_selected()) { 1613 ArgumentsExt::select_gc_ergonomically(); 1614 } 1615 } 1616 1617 void Arguments::set_ergonomics_flags() { 1618 select_gc(); 1619 1620 #ifdef COMPILER2 1621 // Shared spaces work fine with other GCs but causes bytecode rewriting 1622 // to be disabled, which hurts interpreter performance and decreases 1623 // server performance. When -server is specified, keep the default off 1624 // unless it is asked for. Future work: either add bytecode rewriting 1625 // at link time, or rewrite bytecodes in non-shared methods. 1626 if (!DumpSharedSpaces && !RequireSharedSpaces && 1627 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1628 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1629 } 1630 #endif 1631 1632 set_conservative_max_heap_alignment(); 1633 1634 #ifndef ZERO 1635 #ifdef _LP64 1636 set_use_compressed_oops(); 1637 1638 // set_use_compressed_klass_ptrs() must be called after calling 1639 // set_use_compressed_oops(). 1640 set_use_compressed_klass_ptrs(); 1641 1642 // Also checks that certain machines are slower with compressed oops 1643 // in vm_version initialization code. 1644 #endif // _LP64 1645 #endif // !ZERO 1646 } 1647 1648 void Arguments::set_parallel_gc_flags() { 1649 assert(UseParallelGC || UseParallelOldGC, "Error"); 1650 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1651 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1652 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1653 } 1654 FLAG_SET_DEFAULT(UseParallelGC, true); 1655 1656 // If no heap maximum was requested explicitly, use some reasonable fraction 1657 // of the physical memory, up to a maximum of 1GB. 1658 FLAG_SET_DEFAULT(ParallelGCThreads, 1659 Abstract_VM_Version::parallel_worker_threads()); 1660 if (ParallelGCThreads == 0) { 1661 jio_fprintf(defaultStream::error_stream(), 1662 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1663 vm_exit(1); 1664 } 1665 1666 if (UseAdaptiveSizePolicy) { 1667 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1668 // unless the user actually sets these flags. 1669 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1670 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1671 _min_heap_free_ratio = MinHeapFreeRatio; 1672 } 1673 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1674 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1675 _max_heap_free_ratio = MaxHeapFreeRatio; 1676 } 1677 } 1678 1679 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1680 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1681 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1682 // See CR 6362902 for details. 1683 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1684 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1685 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1686 } 1687 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1688 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1689 } 1690 } 1691 1692 if (UseParallelOldGC) { 1693 // Par compact uses lower default values since they are treated as 1694 // minimums. These are different defaults because of the different 1695 // interpretation and are not ergonomically set. 1696 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1697 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1698 } 1699 } 1700 } 1701 1702 void Arguments::set_g1_gc_flags() { 1703 assert(UseG1GC, "Error"); 1704 #ifdef COMPILER1 1705 FastTLABRefill = false; 1706 #endif 1707 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1708 if (ParallelGCThreads == 0) { 1709 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1710 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1711 } 1712 1713 #if INCLUDE_ALL_GCS 1714 if (G1ConcRefinementThreads == 0) { 1715 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads); 1716 } 1717 #endif 1718 1719 // MarkStackSize will be set (if it hasn't been set by the user) 1720 // when concurrent marking is initialized. 1721 // Its value will be based upon the number of parallel marking threads. 1722 // But we do set the maximum mark stack size here. 1723 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1724 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1725 } 1726 1727 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1728 // In G1, we want the default GC overhead goal to be higher than 1729 // say in PS. So we set it here to 10%. Otherwise the heap might 1730 // be expanded more aggressively than we would like it to. In 1731 // fact, even 10% seems to not be high enough in some cases 1732 // (especially small GC stress tests that the main thing they do 1733 // is allocation). We might consider increase it further. 1734 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1735 } 1736 1737 if (PrintGCDetails && Verbose) { 1738 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1739 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1740 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1741 } 1742 } 1743 1744 #if !INCLUDE_ALL_GCS 1745 #ifdef ASSERT 1746 static bool verify_serial_gc_flags() { 1747 return (UseSerialGC && 1748 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC || 1749 UseParallelGC || UseParallelOldGC)); 1750 } 1751 #endif // ASSERT 1752 #endif // INCLUDE_ALL_GCS 1753 1754 void Arguments::set_gc_specific_flags() { 1755 #if INCLUDE_ALL_GCS 1756 // Set per-collector flags 1757 if (UseParallelGC || UseParallelOldGC) { 1758 set_parallel_gc_flags(); 1759 } else if (UseConcMarkSweepGC) { 1760 set_cms_and_parnew_gc_flags(); 1761 } else if (UseG1GC) { 1762 set_g1_gc_flags(); 1763 } 1764 check_deprecated_gc_flags(); 1765 if (AssumeMP && !UseSerialGC) { 1766 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 1767 warning("If the number of processors is expected to increase from one, then" 1768 " you should configure the number of parallel GC threads appropriately" 1769 " using -XX:ParallelGCThreads=N"); 1770 } 1771 } 1772 if (MinHeapFreeRatio == 100) { 1773 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1774 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 1775 } 1776 #else // INCLUDE_ALL_GCS 1777 assert(verify_serial_gc_flags(), "SerialGC unset"); 1778 #endif // INCLUDE_ALL_GCS 1779 } 1780 1781 julong Arguments::limit_by_allocatable_memory(julong limit) { 1782 julong max_allocatable; 1783 julong result = limit; 1784 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1785 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1786 } 1787 return result; 1788 } 1789 1790 // Use static initialization to get the default before parsing 1791 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1792 1793 void Arguments::set_heap_size() { 1794 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1795 // Deprecated flag 1796 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1797 } 1798 1799 const julong phys_mem = 1800 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1801 : (julong)MaxRAM; 1802 1803 // If the maximum heap size has not been set with -Xmx, 1804 // then set it as fraction of the size of physical memory, 1805 // respecting the maximum and minimum sizes of the heap. 1806 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1807 julong reasonable_max = phys_mem / MaxRAMFraction; 1808 1809 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1810 // Small physical memory, so use a minimum fraction of it for the heap 1811 reasonable_max = phys_mem / MinRAMFraction; 1812 } else { 1813 // Not-small physical memory, so require a heap at least 1814 // as large as MaxHeapSize 1815 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1816 } 1817 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1818 // Limit the heap size to ErgoHeapSizeLimit 1819 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1820 } 1821 if (UseCompressedOops) { 1822 // Limit the heap size to the maximum possible when using compressed oops 1823 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1824 1825 // HeapBaseMinAddress can be greater than default but not less than. 1826 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1827 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1828 // matches compressed oops printing flags 1829 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 1830 jio_fprintf(defaultStream::error_stream(), 1831 "HeapBaseMinAddress must be at least " UINTX_FORMAT 1832 " (" UINTX_FORMAT "G) which is greater than value given " 1833 UINTX_FORMAT "\n", 1834 DefaultHeapBaseMinAddress, 1835 DefaultHeapBaseMinAddress/G, 1836 HeapBaseMinAddress); 1837 } 1838 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1839 } 1840 } 1841 1842 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1843 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1844 // but it should be not less than default MaxHeapSize. 1845 max_coop_heap -= HeapBaseMinAddress; 1846 } 1847 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1848 } 1849 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1850 1851 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1852 // An initial heap size was specified on the command line, 1853 // so be sure that the maximum size is consistent. Done 1854 // after call to limit_by_allocatable_memory because that 1855 // method might reduce the allocation size. 1856 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1857 } 1858 1859 if (PrintGCDetails && Verbose) { 1860 // Cannot use gclog_or_tty yet. 1861 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1862 } 1863 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1864 } 1865 1866 // If the minimum or initial heap_size have not been set or requested to be set 1867 // ergonomically, set them accordingly. 1868 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1869 julong reasonable_minimum = (julong)(OldSize + NewSize); 1870 1871 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1872 1873 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1874 1875 if (InitialHeapSize == 0) { 1876 julong reasonable_initial = phys_mem / InitialRAMFraction; 1877 1878 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1879 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1880 1881 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1882 1883 if (PrintGCDetails && Verbose) { 1884 // Cannot use gclog_or_tty yet. 1885 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1886 } 1887 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1888 } 1889 // If the minimum heap size has not been set (via -Xms), 1890 // synchronize with InitialHeapSize to avoid errors with the default value. 1891 if (min_heap_size() == 0) { 1892 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1893 if (PrintGCDetails && Verbose) { 1894 // Cannot use gclog_or_tty yet. 1895 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1896 } 1897 } 1898 } 1899 } 1900 1901 // This must be called after ergonomics because we want bytecode rewriting 1902 // if the server compiler is used, or if UseSharedSpaces is disabled. 1903 void Arguments::set_bytecode_flags() { 1904 // Better not attempt to store into a read-only space. 1905 if (UseSharedSpaces) { 1906 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1907 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1908 } 1909 1910 if (!RewriteBytecodes) { 1911 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1912 } 1913 } 1914 1915 // Aggressive optimization flags -XX:+AggressiveOpts 1916 void Arguments::set_aggressive_opts_flags() { 1917 #ifdef COMPILER2 1918 if (AggressiveUnboxing) { 1919 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1920 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1921 } else if (!EliminateAutoBox) { 1922 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1923 AggressiveUnboxing = false; 1924 } 1925 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1926 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1927 } else if (!DoEscapeAnalysis) { 1928 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1929 AggressiveUnboxing = false; 1930 } 1931 } 1932 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1933 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1934 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1935 } 1936 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1937 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1938 } 1939 1940 // Feed the cache size setting into the JDK 1941 char buffer[1024]; 1942 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1943 add_property(buffer); 1944 } 1945 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1946 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1947 } 1948 #endif 1949 1950 if (AggressiveOpts) { 1951 // Sample flag setting code 1952 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1953 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1954 // } 1955 } 1956 } 1957 1958 //=========================================================================================================== 1959 // Parsing of java.compiler property 1960 1961 void Arguments::process_java_compiler_argument(char* arg) { 1962 // For backwards compatibility, Djava.compiler=NONE or "" 1963 // causes us to switch to -Xint mode UNLESS -Xdebug 1964 // is also specified. 1965 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1966 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1967 } 1968 } 1969 1970 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1971 _sun_java_launcher = os::strdup_check_oom(launcher); 1972 } 1973 1974 bool Arguments::created_by_java_launcher() { 1975 assert(_sun_java_launcher != NULL, "property must have value"); 1976 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1977 } 1978 1979 bool Arguments::sun_java_launcher_is_altjvm() { 1980 return _sun_java_launcher_is_altjvm; 1981 } 1982 1983 //=========================================================================================================== 1984 // Parsing of main arguments 1985 1986 bool Arguments::verify_interval(uintx val, uintx min, 1987 uintx max, const char* name) { 1988 // Returns true iff value is in the inclusive interval [min..max] 1989 // false, otherwise. 1990 if (val >= min && val <= max) { 1991 return true; 1992 } 1993 jio_fprintf(defaultStream::error_stream(), 1994 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1995 " and " UINTX_FORMAT "\n", 1996 name, val, min, max); 1997 return false; 1998 } 1999 2000 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 2001 // Returns true if given value is at least specified min threshold 2002 // false, otherwise. 2003 if (val >= min ) { 2004 return true; 2005 } 2006 jio_fprintf(defaultStream::error_stream(), 2007 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 2008 name, val, min); 2009 return false; 2010 } 2011 2012 bool Arguments::verify_percentage(uintx value, const char* name) { 2013 if (is_percentage(value)) { 2014 return true; 2015 } 2016 jio_fprintf(defaultStream::error_stream(), 2017 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 2018 name, value); 2019 return false; 2020 } 2021 2022 // check if do gclog rotation 2023 // +UseGCLogFileRotation is a must, 2024 // no gc log rotation when log file not supplied or 2025 // NumberOfGCLogFiles is 0 2026 void check_gclog_consistency() { 2027 if (UseGCLogFileRotation) { 2028 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { 2029 jio_fprintf(defaultStream::output_stream(), 2030 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" 2031 "where num_of_file > 0\n" 2032 "GC log rotation is turned off\n"); 2033 UseGCLogFileRotation = false; 2034 } 2035 } 2036 2037 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { 2038 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 2039 jio_fprintf(defaultStream::output_stream(), 2040 "GCLogFileSize changed to minimum 8K\n"); 2041 } 2042 } 2043 2044 // This function is called for -Xloggc:<filename>, it can be used 2045 // to check if a given file name(or string) conforms to the following 2046 // specification: 2047 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 2048 // %p and %t only allowed once. We only limit usage of filename not path 2049 bool is_filename_valid(const char *file_name) { 2050 const char* p = file_name; 2051 char file_sep = os::file_separator()[0]; 2052 const char* cp; 2053 // skip prefix path 2054 for (cp = file_name; *cp != '\0'; cp++) { 2055 if (*cp == '/' || *cp == file_sep) { 2056 p = cp + 1; 2057 } 2058 } 2059 2060 int count_p = 0; 2061 int count_t = 0; 2062 while (*p != '\0') { 2063 if ((*p >= '0' && *p <= '9') || 2064 (*p >= 'A' && *p <= 'Z') || 2065 (*p >= 'a' && *p <= 'z') || 2066 *p == '-' || 2067 *p == '_' || 2068 *p == '.') { 2069 p++; 2070 continue; 2071 } 2072 if (*p == '%') { 2073 if(*(p + 1) == 'p') { 2074 p += 2; 2075 count_p ++; 2076 continue; 2077 } 2078 if (*(p + 1) == 't') { 2079 p += 2; 2080 count_t ++; 2081 continue; 2082 } 2083 } 2084 return false; 2085 } 2086 return count_p < 2 && count_t < 2; 2087 } 2088 2089 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) { 2090 if (!is_percentage(min_heap_free_ratio)) { 2091 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100"); 2092 return false; 2093 } 2094 if (min_heap_free_ratio > MaxHeapFreeRatio) { 2095 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 2096 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio, 2097 MaxHeapFreeRatio); 2098 return false; 2099 } 2100 // This does not set the flag itself, but stores the value in a safe place for later usage. 2101 _min_heap_free_ratio = min_heap_free_ratio; 2102 return true; 2103 } 2104 2105 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) { 2106 if (!is_percentage(max_heap_free_ratio)) { 2107 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100"); 2108 return false; 2109 } 2110 if (max_heap_free_ratio < MinHeapFreeRatio) { 2111 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or " 2112 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio, 2113 MinHeapFreeRatio); 2114 return false; 2115 } 2116 // This does not set the flag itself, but stores the value in a safe place for later usage. 2117 _max_heap_free_ratio = max_heap_free_ratio; 2118 return true; 2119 } 2120 2121 // Check consistency of GC selection 2122 bool Arguments::check_gc_consistency_user() { 2123 check_gclog_consistency(); 2124 // Ensure that the user has not selected conflicting sets 2125 // of collectors. 2126 uint i = 0; 2127 if (UseSerialGC) i++; 2128 if (UseConcMarkSweepGC) i++; 2129 if (UseParallelGC || UseParallelOldGC) i++; 2130 if (UseG1GC) i++; 2131 if (i > 1) { 2132 jio_fprintf(defaultStream::error_stream(), 2133 "Conflicting collector combinations in option list; " 2134 "please refer to the release notes for the combinations " 2135 "allowed\n"); 2136 return false; 2137 } 2138 2139 if (UseConcMarkSweepGC && !UseParNewGC) { 2140 jio_fprintf(defaultStream::error_stream(), 2141 "It is not possible to combine the DefNew young collector with the CMS collector.\n"); 2142 return false; 2143 } 2144 2145 if (UseParNewGC && !UseConcMarkSweepGC) { 2146 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 2147 // set up UseSerialGC properly, so that can't be used in the check here. 2148 jio_fprintf(defaultStream::error_stream(), 2149 "It is not possible to combine the ParNew young collector with the Serial old collector.\n"); 2150 return false; 2151 } 2152 2153 return true; 2154 } 2155 2156 void Arguments::check_deprecated_gc_flags() { 2157 if (FLAG_IS_CMDLINE(UseParNewGC)) { 2158 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release"); 2159 } 2160 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 2161 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 2162 "and will likely be removed in future release"); 2163 } 2164 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 2165 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 2166 "Use MaxRAMFraction instead."); 2167 } 2168 } 2169 2170 // Check stack pages settings 2171 bool Arguments::check_stack_pages() 2172 { 2173 bool status = true; 2174 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 2175 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 2176 // greater stack shadow pages can't generate instruction to bang stack 2177 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 2178 return status; 2179 } 2180 2181 // Check the consistency of vm_init_args 2182 bool Arguments::check_vm_args_consistency() { 2183 // Method for adding checks for flag consistency. 2184 // The intent is to warn the user of all possible conflicts, 2185 // before returning an error. 2186 // Note: Needs platform-dependent factoring. 2187 bool status = true; 2188 2189 if (TLABRefillWasteFraction == 0) { 2190 jio_fprintf(defaultStream::error_stream(), 2191 "TLABRefillWasteFraction should be a denominator, " 2192 "not " SIZE_FORMAT "\n", 2193 TLABRefillWasteFraction); 2194 status = false; 2195 } 2196 2197 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 2198 "AdaptiveSizePolicyWeight"); 2199 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 2200 2201 // Divide by bucket size to prevent a large size from causing rollover when 2202 // calculating amount of memory needed to be allocated for the String table. 2203 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2204 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2205 2206 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize, 2207 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size"); 2208 2209 { 2210 // Using "else if" below to avoid printing two error messages if min > max. 2211 // This will also prevent us from reporting both min>100 and max>100 at the 2212 // same time, but that is less annoying than printing two identical errors IMHO. 2213 FormatBuffer<80> err_msg("%s",""); 2214 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) { 2215 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2216 status = false; 2217 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) { 2218 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2219 status = false; 2220 } 2221 } 2222 2223 // Min/MaxMetaspaceFreeRatio 2224 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2225 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2226 2227 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2228 jio_fprintf(defaultStream::error_stream(), 2229 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2230 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2231 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2232 MinMetaspaceFreeRatio, 2233 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2234 MaxMetaspaceFreeRatio); 2235 status = false; 2236 } 2237 2238 // Trying to keep 100% free is not practical 2239 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2240 2241 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2242 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2243 } 2244 2245 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2246 // Settings to encourage splitting. 2247 if (!FLAG_IS_CMDLINE(NewRatio)) { 2248 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2249 } 2250 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2251 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2252 } 2253 } 2254 2255 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2256 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2257 } 2258 2259 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2260 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2261 if (GCTimeLimit == 100) { 2262 // Turn off gc-overhead-limit-exceeded checks 2263 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2264 } 2265 2266 status = status && check_gc_consistency_user(); 2267 status = status && check_stack_pages(); 2268 2269 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2270 "CMSIncrementalSafetyFactor"); 2271 2272 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2273 // insists that we hold the requisite locks so that the iteration is 2274 // MT-safe. For the verification at start-up and shut-down, we don't 2275 // yet have a good way of acquiring and releasing these locks, 2276 // which are not visible at the CollectedHeap level. We want to 2277 // be able to acquire these locks and then do the iteration rather 2278 // than just disable the lock verification. This will be fixed under 2279 // bug 4788986. 2280 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2281 if (VerifyDuringStartup) { 2282 warning("Heap verification at start-up disabled " 2283 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2284 VerifyDuringStartup = false; // Disable verification at start-up 2285 } 2286 2287 if (VerifyBeforeExit) { 2288 warning("Heap verification at shutdown disabled " 2289 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2290 VerifyBeforeExit = false; // Disable verification at shutdown 2291 } 2292 } 2293 2294 // Note: only executed in non-PRODUCT mode 2295 if (!UseAsyncConcMarkSweepGC && 2296 (ExplicitGCInvokesConcurrent || 2297 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2298 jio_fprintf(defaultStream::error_stream(), 2299 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2300 " with -UseAsyncConcMarkSweepGC"); 2301 status = false; 2302 } 2303 2304 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2305 2306 #if INCLUDE_ALL_GCS 2307 if (UseG1GC) { 2308 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent"); 2309 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent"); 2310 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent"); 2311 2312 status = status && verify_percentage(G1ConfidencePercent, "G1ConfidencePercent"); 2313 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2314 "InitiatingHeapOccupancyPercent"); 2315 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2316 "G1RefProcDrainInterval"); 2317 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2318 "G1ConcMarkStepDurationMillis"); 2319 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2320 "G1ConcRSHotCardLimit"); 2321 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2322 "G1ConcRSLogCacheSize"); 2323 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age, 2324 "StringDeduplicationAgeThreshold"); 2325 } 2326 if (UseConcMarkSweepGC) { 2327 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2328 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2329 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2330 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2331 2332 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2333 2334 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2335 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2336 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2337 2338 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2339 2340 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2341 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2342 2343 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2344 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2345 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2346 2347 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2348 2349 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2350 2351 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2352 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2353 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2354 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2355 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2356 } 2357 2358 if (UseParallelGC || UseParallelOldGC) { 2359 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2360 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2361 2362 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2363 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2364 2365 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2366 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2367 2368 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2369 2370 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2371 } 2372 #endif // INCLUDE_ALL_GCS 2373 2374 status = status && verify_interval(RefDiscoveryPolicy, 2375 ReferenceProcessor::DiscoveryPolicyMin, 2376 ReferenceProcessor::DiscoveryPolicyMax, 2377 "RefDiscoveryPolicy"); 2378 2379 // Limit the lower bound of this flag to 1 as it is used in a division 2380 // expression. 2381 status = status && verify_interval(TLABWasteTargetPercent, 2382 1, 100, "TLABWasteTargetPercent"); 2383 2384 status = status && verify_object_alignment(); 2385 2386 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2387 "CompressedClassSpaceSize"); 2388 2389 status = status && verify_interval(MarkStackSizeMax, 2390 1, (max_jint - 1), "MarkStackSizeMax"); 2391 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2392 2393 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2394 2395 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2396 2397 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2398 2399 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2400 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2401 2402 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2403 2404 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2405 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2406 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2407 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2408 2409 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2410 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2411 2412 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2413 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2414 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2415 2416 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2417 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2418 2419 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold"); 2420 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold"); 2421 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2422 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2423 2424 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2425 #ifdef COMPILER1 2426 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize"); 2427 #endif 2428 status = status && verify_min_value(HeapSearchSteps, 1, "HeapSearchSteps"); 2429 2430 if (PrintNMTStatistics) { 2431 #if INCLUDE_NMT 2432 if (MemTracker::tracking_level() == NMT_off) { 2433 #endif // INCLUDE_NMT 2434 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2435 PrintNMTStatistics = false; 2436 #if INCLUDE_NMT 2437 } 2438 #endif 2439 } 2440 2441 // Need to limit the extent of the padding to reasonable size. 2442 // 8K is well beyond the reasonable HW cache line size, even with the 2443 // aggressive prefetching, while still leaving the room for segregating 2444 // among the distinct pages. 2445 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2446 jio_fprintf(defaultStream::error_stream(), 2447 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2448 ContendedPaddingWidth, 0, 8192); 2449 status = false; 2450 } 2451 2452 // Need to enforce the padding not to break the existing field alignments. 2453 // It is sufficient to check against the largest type size. 2454 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2455 jio_fprintf(defaultStream::error_stream(), 2456 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2457 ContendedPaddingWidth, BytesPerLong); 2458 status = false; 2459 } 2460 2461 // Check lower bounds of the code cache 2462 // Template Interpreter code is approximately 3X larger in debug builds. 2463 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2464 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2465 jio_fprintf(defaultStream::error_stream(), 2466 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2467 os::vm_page_size()/K); 2468 status = false; 2469 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2470 jio_fprintf(defaultStream::error_stream(), 2471 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2472 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2473 status = false; 2474 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2475 jio_fprintf(defaultStream::error_stream(), 2476 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2477 min_code_cache_size/K); 2478 status = false; 2479 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2480 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2481 jio_fprintf(defaultStream::error_stream(), 2482 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2483 CODE_CACHE_SIZE_LIMIT/M); 2484 status = false; 2485 } else if (NonNMethodCodeHeapSize < min_code_cache_size){ 2486 jio_fprintf(defaultStream::error_stream(), 2487 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2488 min_code_cache_size/K); 2489 status = false; 2490 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) 2491 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 2492 jio_fprintf(defaultStream::error_stream(), 2493 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 2494 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 2495 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 2496 status = false; 2497 } 2498 2499 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); 2500 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength"); 2501 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize"); 2502 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt"); 2503 2504 2505 int min_number_of_compiler_threads = get_min_number_of_compiler_threads(); 2506 // The default CICompilerCount's value is CI_COMPILER_COUNT. 2507 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number"); 2508 // Check the minimum number of compiler threads 2509 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount"); 2510 2511 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2512 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2513 } 2514 2515 return status; 2516 } 2517 2518 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2519 const char* option_type) { 2520 if (ignore) return false; 2521 2522 const char* spacer = " "; 2523 if (option_type == NULL) { 2524 option_type = ++spacer; // Set both to the empty string. 2525 } 2526 2527 if (os::obsolete_option(option)) { 2528 jio_fprintf(defaultStream::error_stream(), 2529 "Obsolete %s%soption: %s\n", option_type, spacer, 2530 option->optionString); 2531 return false; 2532 } else { 2533 jio_fprintf(defaultStream::error_stream(), 2534 "Unrecognized %s%soption: %s\n", option_type, spacer, 2535 option->optionString); 2536 return true; 2537 } 2538 } 2539 2540 static const char* user_assertion_options[] = { 2541 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2542 }; 2543 2544 static const char* system_assertion_options[] = { 2545 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2546 }; 2547 2548 bool Arguments::parse_uintx(const char* value, 2549 uintx* uintx_arg, 2550 uintx min_size) { 2551 2552 // Check the sign first since atomull() parses only unsigned values. 2553 bool value_is_positive = !(*value == '-'); 2554 2555 if (value_is_positive) { 2556 julong n; 2557 bool good_return = atomull(value, &n); 2558 if (good_return) { 2559 bool above_minimum = n >= min_size; 2560 bool value_is_too_large = n > max_uintx; 2561 2562 if (above_minimum && !value_is_too_large) { 2563 *uintx_arg = n; 2564 return true; 2565 } 2566 } 2567 } 2568 return false; 2569 } 2570 2571 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2572 julong* long_arg, 2573 julong min_size) { 2574 if (!atomull(s, long_arg)) return arg_unreadable; 2575 return check_memory_size(*long_arg, min_size); 2576 } 2577 2578 // Parse JavaVMInitArgs structure 2579 2580 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2581 // For components of the system classpath. 2582 SysClassPath scp(Arguments::get_sysclasspath()); 2583 bool scp_assembly_required = false; 2584 2585 // Save default settings for some mode flags 2586 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2587 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2588 Arguments::_ClipInlining = ClipInlining; 2589 Arguments::_BackgroundCompilation = BackgroundCompilation; 2590 2591 // Setup flags for mixed which is the default 2592 set_mode_flags(_mixed); 2593 2594 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2595 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2596 if (result != JNI_OK) { 2597 return result; 2598 } 2599 2600 // Parse JavaVMInitArgs structure passed in 2601 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE); 2602 if (result != JNI_OK) { 2603 return result; 2604 } 2605 2606 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2607 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2608 if (result != JNI_OK) { 2609 return result; 2610 } 2611 2612 // Do final processing now that all arguments have been parsed 2613 result = finalize_vm_init_args(&scp, scp_assembly_required); 2614 if (result != JNI_OK) { 2615 return result; 2616 } 2617 2618 return JNI_OK; 2619 } 2620 2621 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2622 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2623 // are dealing with -agentpath (case where name is a path), otherwise with 2624 // -agentlib 2625 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2626 char *_name; 2627 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2628 size_t _len_hprof, _len_jdwp, _len_prefix; 2629 2630 if (is_path) { 2631 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2632 return false; 2633 } 2634 2635 _name++; // skip past last path separator 2636 _len_prefix = strlen(JNI_LIB_PREFIX); 2637 2638 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2639 return false; 2640 } 2641 2642 _name += _len_prefix; 2643 _len_hprof = strlen(_hprof); 2644 _len_jdwp = strlen(_jdwp); 2645 2646 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2647 _name += _len_hprof; 2648 } 2649 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2650 _name += _len_jdwp; 2651 } 2652 else { 2653 return false; 2654 } 2655 2656 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2657 return false; 2658 } 2659 2660 return true; 2661 } 2662 2663 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2664 return true; 2665 } 2666 2667 return false; 2668 } 2669 2670 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2671 SysClassPath* scp_p, 2672 bool* scp_assembly_required_p, 2673 Flag::Flags origin) { 2674 // Remaining part of option string 2675 const char* tail; 2676 2677 // iterate over arguments 2678 for (int index = 0; index < args->nOptions; index++) { 2679 bool is_absolute_path = false; // for -agentpath vs -agentlib 2680 2681 const JavaVMOption* option = args->options + index; 2682 2683 if (!match_option(option, "-Djava.class.path", &tail) && 2684 !match_option(option, "-Dsun.java.command", &tail) && 2685 !match_option(option, "-Dsun.java.launcher", &tail)) { 2686 2687 // add all jvm options to the jvm_args string. This string 2688 // is used later to set the java.vm.args PerfData string constant. 2689 // the -Djava.class.path and the -Dsun.java.command options are 2690 // omitted from jvm_args string as each have their own PerfData 2691 // string constant object. 2692 build_jvm_args(option->optionString); 2693 } 2694 2695 // -verbose:[class/gc/jni] 2696 if (match_option(option, "-verbose", &tail)) { 2697 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2698 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2699 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2700 } else if (!strcmp(tail, ":gc")) { 2701 FLAG_SET_CMDLINE(bool, PrintGC, true); 2702 } else if (!strcmp(tail, ":jni")) { 2703 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2704 } 2705 // -da / -ea / -disableassertions / -enableassertions 2706 // These accept an optional class/package name separated by a colon, e.g., 2707 // -da:java.lang.Thread. 2708 } else if (match_option(option, user_assertion_options, &tail, true)) { 2709 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2710 if (*tail == '\0') { 2711 JavaAssertions::setUserClassDefault(enable); 2712 } else { 2713 assert(*tail == ':', "bogus match by match_option()"); 2714 JavaAssertions::addOption(tail + 1, enable); 2715 } 2716 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2717 } else if (match_option(option, system_assertion_options, &tail, false)) { 2718 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2719 JavaAssertions::setSystemClassDefault(enable); 2720 // -bootclasspath: 2721 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2722 scp_p->reset_path(tail); 2723 *scp_assembly_required_p = true; 2724 // -bootclasspath/a: 2725 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2726 scp_p->add_suffix(tail); 2727 *scp_assembly_required_p = true; 2728 // -bootclasspath/p: 2729 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2730 scp_p->add_prefix(tail); 2731 *scp_assembly_required_p = true; 2732 // -Xrun 2733 } else if (match_option(option, "-Xrun", &tail)) { 2734 if (tail != NULL) { 2735 const char* pos = strchr(tail, ':'); 2736 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2737 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2738 name[len] = '\0'; 2739 2740 char *options = NULL; 2741 if(pos != NULL) { 2742 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2743 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2744 } 2745 #if !INCLUDE_JVMTI 2746 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2747 jio_fprintf(defaultStream::error_stream(), 2748 "Profiling and debugging agents are not supported in this VM\n"); 2749 return JNI_ERR; 2750 } 2751 #endif // !INCLUDE_JVMTI 2752 add_init_library(name, options); 2753 } 2754 // -agentlib and -agentpath 2755 } else if (match_option(option, "-agentlib:", &tail) || 2756 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2757 if(tail != NULL) { 2758 const char* pos = strchr(tail, '='); 2759 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2760 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2761 name[len] = '\0'; 2762 2763 char *options = NULL; 2764 if(pos != NULL) { 2765 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2766 } 2767 #if !INCLUDE_JVMTI 2768 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2769 jio_fprintf(defaultStream::error_stream(), 2770 "Profiling and debugging agents are not supported in this VM\n"); 2771 return JNI_ERR; 2772 } 2773 #endif // !INCLUDE_JVMTI 2774 add_init_agent(name, options, is_absolute_path); 2775 } 2776 // -javaagent 2777 } else if (match_option(option, "-javaagent:", &tail)) { 2778 #if !INCLUDE_JVMTI 2779 jio_fprintf(defaultStream::error_stream(), 2780 "Instrumentation agents are not supported in this VM\n"); 2781 return JNI_ERR; 2782 #else 2783 if(tail != NULL) { 2784 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2785 add_init_agent("instrument", options, false); 2786 } 2787 #endif // !INCLUDE_JVMTI 2788 // -Xnoclassgc 2789 } else if (match_option(option, "-Xnoclassgc")) { 2790 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2791 // -Xconcgc 2792 } else if (match_option(option, "-Xconcgc")) { 2793 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2794 // -Xnoconcgc 2795 } else if (match_option(option, "-Xnoconcgc")) { 2796 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2797 // -Xbatch 2798 } else if (match_option(option, "-Xbatch")) { 2799 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2800 // -Xmn for compatibility with other JVM vendors 2801 } else if (match_option(option, "-Xmn", &tail)) { 2802 julong long_initial_young_size = 0; 2803 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2804 if (errcode != arg_in_range) { 2805 jio_fprintf(defaultStream::error_stream(), 2806 "Invalid initial young generation size: %s\n", option->optionString); 2807 describe_range_error(errcode); 2808 return JNI_EINVAL; 2809 } 2810 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size); 2811 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size); 2812 // -Xms 2813 } else if (match_option(option, "-Xms", &tail)) { 2814 julong long_initial_heap_size = 0; 2815 // an initial heap size of 0 means automatically determine 2816 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2817 if (errcode != arg_in_range) { 2818 jio_fprintf(defaultStream::error_stream(), 2819 "Invalid initial heap size: %s\n", option->optionString); 2820 describe_range_error(errcode); 2821 return JNI_EINVAL; 2822 } 2823 set_min_heap_size((uintx)long_initial_heap_size); 2824 // Currently the minimum size and the initial heap sizes are the same. 2825 // Can be overridden with -XX:InitialHeapSize. 2826 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2827 // -Xmx 2828 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2829 julong long_max_heap_size = 0; 2830 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2831 if (errcode != arg_in_range) { 2832 jio_fprintf(defaultStream::error_stream(), 2833 "Invalid maximum heap size: %s\n", option->optionString); 2834 describe_range_error(errcode); 2835 return JNI_EINVAL; 2836 } 2837 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2838 // Xmaxf 2839 } else if (match_option(option, "-Xmaxf", &tail)) { 2840 char* err; 2841 int maxf = (int)(strtod(tail, &err) * 100); 2842 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) { 2843 jio_fprintf(defaultStream::error_stream(), 2844 "Bad max heap free percentage size: %s\n", 2845 option->optionString); 2846 return JNI_EINVAL; 2847 } else { 2848 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2849 } 2850 // Xminf 2851 } else if (match_option(option, "-Xminf", &tail)) { 2852 char* err; 2853 int minf = (int)(strtod(tail, &err) * 100); 2854 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) { 2855 jio_fprintf(defaultStream::error_stream(), 2856 "Bad min heap free percentage size: %s\n", 2857 option->optionString); 2858 return JNI_EINVAL; 2859 } else { 2860 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2861 } 2862 // -Xss 2863 } else if (match_option(option, "-Xss", &tail)) { 2864 julong long_ThreadStackSize = 0; 2865 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2866 if (errcode != arg_in_range) { 2867 jio_fprintf(defaultStream::error_stream(), 2868 "Invalid thread stack size: %s\n", option->optionString); 2869 describe_range_error(errcode); 2870 return JNI_EINVAL; 2871 } 2872 // Internally track ThreadStackSize in units of 1024 bytes. 2873 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2874 round_to((int)long_ThreadStackSize, K) / K); 2875 // -Xoss 2876 } else if (match_option(option, "-Xoss", &tail)) { 2877 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2878 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2879 julong long_CodeCacheExpansionSize = 0; 2880 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2881 if (errcode != arg_in_range) { 2882 jio_fprintf(defaultStream::error_stream(), 2883 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2884 os::vm_page_size()/K); 2885 return JNI_EINVAL; 2886 } 2887 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2888 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2889 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2890 julong long_ReservedCodeCacheSize = 0; 2891 2892 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2893 if (errcode != arg_in_range) { 2894 jio_fprintf(defaultStream::error_stream(), 2895 "Invalid maximum code cache size: %s.\n", option->optionString); 2896 return JNI_EINVAL; 2897 } 2898 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2899 // -XX:NonNMethodCodeHeapSize= 2900 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 2901 julong long_NonNMethodCodeHeapSize = 0; 2902 2903 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 2904 if (errcode != arg_in_range) { 2905 jio_fprintf(defaultStream::error_stream(), 2906 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 2907 return JNI_EINVAL; 2908 } 2909 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize); 2910 // -XX:ProfiledCodeHeapSize= 2911 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 2912 julong long_ProfiledCodeHeapSize = 0; 2913 2914 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 2915 if (errcode != arg_in_range) { 2916 jio_fprintf(defaultStream::error_stream(), 2917 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 2918 return JNI_EINVAL; 2919 } 2920 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize); 2921 // -XX:NonProfiledCodeHeapSizee= 2922 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 2923 julong long_NonProfiledCodeHeapSize = 0; 2924 2925 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 2926 if (errcode != arg_in_range) { 2927 jio_fprintf(defaultStream::error_stream(), 2928 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 2929 return JNI_EINVAL; 2930 } 2931 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize); 2932 //-XX:IncreaseFirstTierCompileThresholdAt= 2933 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2934 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2935 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2936 jio_fprintf(defaultStream::error_stream(), 2937 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2938 option->optionString); 2939 return JNI_EINVAL; 2940 } 2941 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2942 // -green 2943 } else if (match_option(option, "-green")) { 2944 jio_fprintf(defaultStream::error_stream(), 2945 "Green threads support not available\n"); 2946 return JNI_EINVAL; 2947 // -native 2948 } else if (match_option(option, "-native")) { 2949 // HotSpot always uses native threads, ignore silently for compatibility 2950 // -Xsqnopause 2951 } else if (match_option(option, "-Xsqnopause")) { 2952 // EVM option, ignore silently for compatibility 2953 // -Xrs 2954 } else if (match_option(option, "-Xrs")) { 2955 // Classic/EVM option, new functionality 2956 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2957 } else if (match_option(option, "-Xusealtsigs")) { 2958 // change default internal VM signals used - lower case for back compat 2959 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2960 // -Xoptimize 2961 } else if (match_option(option, "-Xoptimize")) { 2962 // EVM option, ignore silently for compatibility 2963 // -Xprof 2964 } else if (match_option(option, "-Xprof")) { 2965 #if INCLUDE_FPROF 2966 _has_profile = true; 2967 #else // INCLUDE_FPROF 2968 jio_fprintf(defaultStream::error_stream(), 2969 "Flat profiling is not supported in this VM.\n"); 2970 return JNI_ERR; 2971 #endif // INCLUDE_FPROF 2972 // -Xconcurrentio 2973 } else if (match_option(option, "-Xconcurrentio")) { 2974 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2975 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2976 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2977 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2978 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2979 2980 // -Xinternalversion 2981 } else if (match_option(option, "-Xinternalversion")) { 2982 jio_fprintf(defaultStream::output_stream(), "%s\n", 2983 VM_Version::internal_vm_info_string()); 2984 vm_exit(0); 2985 #ifndef PRODUCT 2986 // -Xprintflags 2987 } else if (match_option(option, "-Xprintflags")) { 2988 CommandLineFlags::printFlags(tty, false); 2989 vm_exit(0); 2990 #endif 2991 // -D 2992 } else if (match_option(option, "-D", &tail)) { 2993 const char* value; 2994 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2995 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2996 // abort if -Djava.endorsed.dirs is set 2997 jio_fprintf(defaultStream::output_stream(), 2998 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2999 "in modular form will be supported via the concept of upgradeable modules.\n", value); 3000 return JNI_EINVAL; 3001 } 3002 if (match_option(option, "-Djava.ext.dirs=", &value) && 3003 *value != '\0' && strcmp(value, "\"\"") != 0) { 3004 // abort if -Djava.ext.dirs is set 3005 jio_fprintf(defaultStream::output_stream(), 3006 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 3007 return JNI_EINVAL; 3008 } 3009 3010 if (!add_property(tail)) { 3011 return JNI_ENOMEM; 3012 } 3013 // Out of the box management support 3014 if (match_option(option, "-Dcom.sun.management", &tail)) { 3015 #if INCLUDE_MANAGEMENT 3016 FLAG_SET_CMDLINE(bool, ManagementServer, true); 3017 #else 3018 jio_fprintf(defaultStream::output_stream(), 3019 "-Dcom.sun.management is not supported in this VM.\n"); 3020 return JNI_ERR; 3021 #endif 3022 } 3023 // -Xint 3024 } else if (match_option(option, "-Xint")) { 3025 set_mode_flags(_int); 3026 // -Xmixed 3027 } else if (match_option(option, "-Xmixed")) { 3028 set_mode_flags(_mixed); 3029 // -Xcomp 3030 } else if (match_option(option, "-Xcomp")) { 3031 // for testing the compiler; turn off all flags that inhibit compilation 3032 set_mode_flags(_comp); 3033 // -Xshare:dump 3034 } else if (match_option(option, "-Xshare:dump")) { 3035 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 3036 set_mode_flags(_int); // Prevent compilation, which creates objects 3037 // -Xshare:on 3038 } else if (match_option(option, "-Xshare:on")) { 3039 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3040 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3041 // -Xshare:auto 3042 } else if (match_option(option, "-Xshare:auto")) { 3043 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3044 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3045 // -Xshare:off 3046 } else if (match_option(option, "-Xshare:off")) { 3047 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 3048 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3049 // -Xverify 3050 } else if (match_option(option, "-Xverify", &tail)) { 3051 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3052 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 3053 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3054 } else if (strcmp(tail, ":remote") == 0) { 3055 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3056 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3057 } else if (strcmp(tail, ":none") == 0) { 3058 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3059 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 3060 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3061 return JNI_EINVAL; 3062 } 3063 // -Xdebug 3064 } else if (match_option(option, "-Xdebug")) { 3065 // note this flag has been used, then ignore 3066 set_xdebug_mode(true); 3067 // -Xnoagent 3068 } else if (match_option(option, "-Xnoagent")) { 3069 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3070 } else if (match_option(option, "-Xboundthreads")) { 3071 // Bind user level threads to kernel threads (Solaris only) 3072 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 3073 } else if (match_option(option, "-Xloggc:", &tail)) { 3074 // Redirect GC output to the file. -Xloggc:<filename> 3075 // ostream_init_log(), when called will use this filename 3076 // to initialize a fileStream. 3077 _gc_log_filename = os::strdup_check_oom(tail); 3078 if (!is_filename_valid(_gc_log_filename)) { 3079 jio_fprintf(defaultStream::output_stream(), 3080 "Invalid file name for use with -Xloggc: Filename can only contain the " 3081 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 3082 "Note %%p or %%t can only be used once\n", _gc_log_filename); 3083 return JNI_EINVAL; 3084 } 3085 FLAG_SET_CMDLINE(bool, PrintGC, true); 3086 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 3087 3088 // JNI hooks 3089 } else if (match_option(option, "-Xcheck", &tail)) { 3090 if (!strcmp(tail, ":jni")) { 3091 #if !INCLUDE_JNI_CHECK 3092 warning("JNI CHECKING is not supported in this VM"); 3093 #else 3094 CheckJNICalls = true; 3095 #endif // INCLUDE_JNI_CHECK 3096 } else if (is_bad_option(option, args->ignoreUnrecognized, 3097 "check")) { 3098 return JNI_EINVAL; 3099 } 3100 } else if (match_option(option, "vfprintf")) { 3101 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3102 } else if (match_option(option, "exit")) { 3103 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3104 } else if (match_option(option, "abort")) { 3105 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3106 // -XX:+AggressiveHeap 3107 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3108 3109 // This option inspects the machine and attempts to set various 3110 // parameters to be optimal for long-running, memory allocation 3111 // intensive jobs. It is intended for machines with large 3112 // amounts of cpu and memory. 3113 3114 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 3115 // VM, but we may not be able to represent the total physical memory 3116 // available (like having 8gb of memory on a box but using a 32bit VM). 3117 // Thus, we need to make sure we're using a julong for intermediate 3118 // calculations. 3119 julong initHeapSize; 3120 julong total_memory = os::physical_memory(); 3121 3122 if (total_memory < (julong)256*M) { 3123 jio_fprintf(defaultStream::error_stream(), 3124 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 3125 vm_exit(1); 3126 } 3127 3128 // The heap size is half of available memory, or (at most) 3129 // all of possible memory less 160mb (leaving room for the OS 3130 // when using ISM). This is the maximum; because adaptive sizing 3131 // is turned on below, the actual space used may be smaller. 3132 3133 initHeapSize = MIN2(total_memory / (julong)2, 3134 total_memory - (julong)160*M); 3135 3136 initHeapSize = limit_by_allocatable_memory(initHeapSize); 3137 3138 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 3139 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 3140 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 3141 // Currently the minimum size and the initial heap sizes are the same. 3142 set_min_heap_size(initHeapSize); 3143 } 3144 if (FLAG_IS_DEFAULT(NewSize)) { 3145 // Make the young generation 3/8ths of the total heap. 3146 FLAG_SET_CMDLINE(uintx, NewSize, 3147 ((julong)MaxHeapSize / (julong)8) * (julong)3); 3148 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 3149 } 3150 3151 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3152 FLAG_SET_DEFAULT(UseLargePages, true); 3153 #endif 3154 3155 // Increase some data structure sizes for efficiency 3156 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 3157 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3158 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 3159 3160 // See the OldPLABSize comment below, but replace 'after promotion' 3161 // with 'after copying'. YoungPLABSize is the size of the survivor 3162 // space per-gc-thread buffers. The default is 4kw. 3163 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 3164 3165 // OldPLABSize is the size of the buffers in the old gen that 3166 // UseParallelGC uses to promote live data that doesn't fit in the 3167 // survivor spaces. At any given time, there's one for each gc thread. 3168 // The default size is 1kw. These buffers are rarely used, since the 3169 // survivor spaces are usually big enough. For specjbb, however, there 3170 // are occasions when there's lots of live data in the young gen 3171 // and we end up promoting some of it. We don't have a definite 3172 // explanation for why bumping OldPLABSize helps, but the theory 3173 // is that a bigger PLAB results in retaining something like the 3174 // original allocation order after promotion, which improves mutator 3175 // locality. A minor effect may be that larger PLABs reduce the 3176 // number of PLAB allocation events during gc. The value of 8kw 3177 // was arrived at by experimenting with specjbb. 3178 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 3179 3180 // Enable parallel GC and adaptive generation sizing 3181 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 3182 FLAG_SET_DEFAULT(ParallelGCThreads, 3183 Abstract_VM_Version::parallel_worker_threads()); 3184 3185 // Encourage steady state memory management 3186 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 3187 3188 // This appears to improve mutator locality 3189 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3190 3191 // Get around early Solaris scheduling bug 3192 // (affinity vs other jobs on system) 3193 // but disallow DR and offlining (5008695). 3194 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 3195 3196 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3197 // and the last option wins. 3198 } else if (match_option(option, "-XX:+NeverTenure")) { 3199 FLAG_SET_CMDLINE(bool, NeverTenure, true); 3200 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3201 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1); 3202 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3203 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3204 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3205 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 3206 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3207 uintx max_tenuring_thresh = 0; 3208 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3209 jio_fprintf(defaultStream::error_stream(), 3210 "Invalid MaxTenuringThreshold: %s\n", option->optionString); 3211 } 3212 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh); 3213 3214 if (MaxTenuringThreshold == 0) { 3215 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3216 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3217 } else { 3218 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3219 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3220 } 3221 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3222 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3223 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3224 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3225 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3226 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3227 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3228 #if defined(DTRACE_ENABLED) 3229 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3230 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3231 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3232 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3233 #else // defined(DTRACE_ENABLED) 3234 jio_fprintf(defaultStream::error_stream(), 3235 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3236 return JNI_EINVAL; 3237 #endif // defined(DTRACE_ENABLED) 3238 #ifdef ASSERT 3239 } else if (match_option(option, "-XX:+FullGCALot")) { 3240 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3241 // disable scavenge before parallel mark-compact 3242 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3243 #endif 3244 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3245 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3246 julong stack_size = 0; 3247 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3248 if (errcode != arg_in_range) { 3249 jio_fprintf(defaultStream::error_stream(), 3250 "Invalid mark stack size: %s\n", option->optionString); 3251 describe_range_error(errcode); 3252 return JNI_EINVAL; 3253 } 3254 jio_fprintf(defaultStream::error_stream(), 3255 "Please use -XX:MarkStackSize in place of " 3256 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n"); 3257 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3258 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3259 julong max_stack_size = 0; 3260 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3261 if (errcode != arg_in_range) { 3262 jio_fprintf(defaultStream::error_stream(), 3263 "Invalid maximum mark stack size: %s\n", 3264 option->optionString); 3265 describe_range_error(errcode); 3266 return JNI_EINVAL; 3267 } 3268 jio_fprintf(defaultStream::error_stream(), 3269 "Please use -XX:MarkStackSizeMax in place of " 3270 "-XX:CMSMarkStackSizeMax in the future\n"); 3271 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3272 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3273 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3274 uintx conc_threads = 0; 3275 if (!parse_uintx(tail, &conc_threads, 1)) { 3276 jio_fprintf(defaultStream::error_stream(), 3277 "Invalid concurrent threads: %s\n", option->optionString); 3278 return JNI_EINVAL; 3279 } 3280 jio_fprintf(defaultStream::error_stream(), 3281 "Please use -XX:ConcGCThreads in place of " 3282 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n"); 3283 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3284 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3285 julong max_direct_memory_size = 0; 3286 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3287 if (errcode != arg_in_range) { 3288 jio_fprintf(defaultStream::error_stream(), 3289 "Invalid maximum direct memory size: %s\n", 3290 option->optionString); 3291 describe_range_error(errcode); 3292 return JNI_EINVAL; 3293 } 3294 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3295 #if !INCLUDE_MANAGEMENT 3296 } else if (match_option(option, "-XX:+ManagementServer")) { 3297 jio_fprintf(defaultStream::error_stream(), 3298 "ManagementServer is not supported in this VM.\n"); 3299 return JNI_ERR; 3300 #endif // INCLUDE_MANAGEMENT 3301 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3302 // Skip -XX:Flags= since that case has already been handled 3303 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3304 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3305 return JNI_EINVAL; 3306 } 3307 } 3308 // Unknown option 3309 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3310 return JNI_ERR; 3311 } 3312 } 3313 3314 // PrintSharedArchiveAndExit will turn on 3315 // -Xshare:on 3316 // -XX:+TraceClassPaths 3317 if (PrintSharedArchiveAndExit) { 3318 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3319 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3320 FLAG_SET_CMDLINE(bool, TraceClassPaths, true); 3321 } 3322 3323 // Change the default value for flags which have different default values 3324 // when working with older JDKs. 3325 #ifdef LINUX 3326 if (JDK_Version::current().compare_major(6) <= 0 && 3327 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3328 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3329 } 3330 #endif // LINUX 3331 fix_appclasspath(); 3332 return JNI_OK; 3333 } 3334 3335 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3336 // 3337 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3338 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3339 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3340 // path is treated as the current directory. 3341 // 3342 // This causes problems with CDS, which requires that all directories specified in the classpath 3343 // must be empty. In most cases, applications do NOT want to load classes from the current 3344 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3345 // scripts compatible with CDS. 3346 void Arguments::fix_appclasspath() { 3347 if (IgnoreEmptyClassPaths) { 3348 const char separator = *os::path_separator(); 3349 const char* src = _java_class_path->value(); 3350 3351 // skip over all the leading empty paths 3352 while (*src == separator) { 3353 src ++; 3354 } 3355 3356 char* copy = AllocateHeap(strlen(src) + 1, mtInternal); 3357 strncpy(copy, src, strlen(src) + 1); 3358 3359 // trim all trailing empty paths 3360 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3361 *tail = '\0'; 3362 } 3363 3364 char from[3] = {separator, separator, '\0'}; 3365 char to [2] = {separator, '\0'}; 3366 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3367 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3368 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3369 } 3370 3371 _java_class_path->set_value(copy); 3372 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3373 } 3374 3375 if (!PrintSharedArchiveAndExit) { 3376 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value()); 3377 } 3378 } 3379 3380 static bool has_jar_files(const char* directory) { 3381 DIR* dir = os::opendir(directory); 3382 if (dir == NULL) return false; 3383 3384 struct dirent *entry; 3385 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 3386 bool hasJarFile = false; 3387 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3388 const char* name = entry->d_name; 3389 const char* ext = name + strlen(name) - 4; 3390 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3391 } 3392 FREE_C_HEAP_ARRAY(char, dbuf); 3393 os::closedir(dir); 3394 return hasJarFile ; 3395 } 3396 3397 static int check_non_empty_dirs(const char* path) { 3398 const char separator = *os::path_separator(); 3399 const char* const end = path + strlen(path); 3400 int nonEmptyDirs = 0; 3401 while (path < end) { 3402 const char* tmp_end = strchr(path, separator); 3403 if (tmp_end == NULL) { 3404 if (has_jar_files(path)) { 3405 nonEmptyDirs++; 3406 jio_fprintf(defaultStream::output_stream(), 3407 "Non-empty directory: %s\n", path); 3408 } 3409 path = end; 3410 } else { 3411 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 3412 memcpy(dirpath, path, tmp_end - path); 3413 dirpath[tmp_end - path] = '\0'; 3414 if (has_jar_files(dirpath)) { 3415 nonEmptyDirs++; 3416 jio_fprintf(defaultStream::output_stream(), 3417 "Non-empty directory: %s\n", dirpath); 3418 } 3419 FREE_C_HEAP_ARRAY(char, dirpath); 3420 path = tmp_end + 1; 3421 } 3422 } 3423 return nonEmptyDirs; 3424 } 3425 3426 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3427 // check if the default lib/endorsed directory exists; if so, error 3428 char path[JVM_MAXPATHLEN]; 3429 const char* fileSep = os::file_separator(); 3430 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3431 3432 if (CheckEndorsedAndExtDirs) { 3433 int nonEmptyDirs = 0; 3434 // check endorsed directory 3435 nonEmptyDirs += check_non_empty_dirs(path); 3436 // check the extension directories 3437 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3438 if (nonEmptyDirs > 0) { 3439 return JNI_ERR; 3440 } 3441 } 3442 3443 DIR* dir = os::opendir(path); 3444 if (dir != NULL) { 3445 jio_fprintf(defaultStream::output_stream(), 3446 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3447 "in modular form will be supported via the concept of upgradeable modules.\n"); 3448 os::closedir(dir); 3449 return JNI_ERR; 3450 } 3451 3452 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3453 dir = os::opendir(path); 3454 if (dir != NULL) { 3455 jio_fprintf(defaultStream::output_stream(), 3456 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3457 "Use -classpath instead.\n."); 3458 os::closedir(dir); 3459 return JNI_ERR; 3460 } 3461 3462 if (scp_assembly_required) { 3463 // Assemble the bootclasspath elements into the final path. 3464 Arguments::set_sysclasspath(scp_p->combined_path()); 3465 } 3466 3467 // This must be done after all arguments have been processed. 3468 // java_compiler() true means set to "NONE" or empty. 3469 if (java_compiler() && !xdebug_mode()) { 3470 // For backwards compatibility, we switch to interpreted mode if 3471 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3472 // not specified. 3473 set_mode_flags(_int); 3474 } 3475 3476 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3477 // but like -Xint, leave compilation thresholds unaffected. 3478 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3479 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3480 set_mode_flags(_int); 3481 } 3482 3483 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3484 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3485 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3486 } 3487 3488 #ifndef COMPILER2 3489 // Don't degrade server performance for footprint 3490 if (FLAG_IS_DEFAULT(UseLargePages) && 3491 MaxHeapSize < LargePageHeapSizeThreshold) { 3492 // No need for large granularity pages w/small heaps. 3493 // Note that large pages are enabled/disabled for both the 3494 // Java heap and the code cache. 3495 FLAG_SET_DEFAULT(UseLargePages, false); 3496 } 3497 3498 #else 3499 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3500 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3501 } 3502 #endif 3503 3504 #ifndef TIERED 3505 // Tiered compilation is undefined. 3506 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3507 #endif 3508 3509 // If we are running in a headless jre, force java.awt.headless property 3510 // to be true unless the property has already been set. 3511 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3512 if (os::is_headless_jre()) { 3513 const char* headless = Arguments::get_property("java.awt.headless"); 3514 if (headless == NULL) { 3515 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3516 if (headless_env == NULL) { 3517 if (!add_property("java.awt.headless=true")) { 3518 return JNI_ENOMEM; 3519 } 3520 } else { 3521 char buffer[256]; 3522 const char *key = "java.awt.headless="; 3523 strcpy(buffer, key); 3524 strncat(buffer, headless_env, 256 - strlen(key) - 1); 3525 if (!add_property(buffer)) { 3526 return JNI_ENOMEM; 3527 } 3528 } 3529 } 3530 } 3531 3532 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) { 3533 // CMS can only be used with ParNew 3534 FLAG_SET_ERGO(bool, UseParNewGC, true); 3535 } 3536 3537 if (!check_vm_args_consistency()) { 3538 return JNI_ERR; 3539 } 3540 3541 return JNI_OK; 3542 } 3543 3544 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3545 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3546 scp_assembly_required_p); 3547 } 3548 3549 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3550 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3551 scp_assembly_required_p); 3552 } 3553 3554 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3555 char *buffer = ::getenv(name); 3556 3557 // Don't check this variable if user has special privileges 3558 // (e.g. unix su command). 3559 if (buffer == NULL || os::have_special_privileges()) { 3560 return JNI_OK; 3561 } 3562 3563 if ((buffer = os::strdup(buffer)) == NULL) { 3564 return JNI_ENOMEM; 3565 } 3566 GrowableArray<JavaVMOption> options(2, true); // Construct option array 3567 jio_fprintf(defaultStream::error_stream(), 3568 "Picked up %s: %s\n", name, buffer); 3569 char* rd = buffer; // pointer to the input string (rd) 3570 while (true) { // repeat for all options in the input string 3571 while (isspace(*rd)) rd++; // skip whitespace 3572 if (*rd == 0) break; // we re done when the input string is read completely 3573 3574 // The output, option string, overwrites the input string. 3575 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3576 // input string (rd). 3577 char* wrt = rd; 3578 3579 JavaVMOption option; 3580 option.optionString = wrt; 3581 options.append(option); // Fill in option 3582 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3583 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3584 int quote = *rd; // matching quote to look for 3585 rd++; // don't copy open quote 3586 while (*rd != quote) { // include everything (even spaces) up until quote 3587 if (*rd == 0) { // string termination means unmatched string 3588 jio_fprintf(defaultStream::error_stream(), 3589 "Unmatched quote in %s\n", name); 3590 os::free(buffer); 3591 return JNI_ERR; 3592 } 3593 *wrt++ = *rd++; // copy to option string 3594 } 3595 rd++; // don't copy close quote 3596 } else { 3597 *wrt++ = *rd++; // copy to option string 3598 } 3599 } 3600 // Need to check if we're done before writing a NULL, 3601 // because the write could be to the byte that rd is pointing to. 3602 if (*rd++ == 0) { 3603 *wrt = 0; 3604 break; 3605 } 3606 *wrt = 0; // Zero terminate option 3607 } 3608 JavaVMOption* options_arr = 3609 NEW_C_HEAP_ARRAY_RETURN_NULL(JavaVMOption, options.length(), mtInternal); 3610 if (options_arr == NULL) { 3611 return JNI_ENOMEM; 3612 } 3613 for (int i = 0; i < options.length(); i++) { 3614 options_arr[i] = options.at(i); 3615 } 3616 3617 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3618 JavaVMInitArgs vm_args; 3619 vm_args.version = JNI_VERSION_1_2; 3620 vm_args.options = options_arr; 3621 vm_args.nOptions = options.length(); 3622 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3623 3624 if (PrintVMOptions) { 3625 const char* tail; 3626 for (int i = 0; i < vm_args.nOptions; i++) { 3627 const JavaVMOption *option = vm_args.options + i; 3628 if (match_option(option, "-XX:", &tail)) { 3629 logOption(tail); 3630 } 3631 } 3632 } 3633 3634 jint result = parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, 3635 Flag::ENVIRON_VAR); 3636 FREE_C_HEAP_ARRAY(JavaVMOption, options_arr); 3637 os::free(buffer); 3638 return result; 3639 } 3640 3641 void Arguments::set_shared_spaces_flags() { 3642 if (DumpSharedSpaces) { 3643 if (RequireSharedSpaces) { 3644 warning("cannot dump shared archive while using shared archive"); 3645 } 3646 UseSharedSpaces = false; 3647 #ifdef _LP64 3648 if (!UseCompressedOops || !UseCompressedClassPointers) { 3649 vm_exit_during_initialization( 3650 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3651 } 3652 } else { 3653 if (!UseCompressedOops || !UseCompressedClassPointers) { 3654 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3655 } 3656 #endif 3657 } 3658 } 3659 3660 #if !INCLUDE_ALL_GCS 3661 static void force_serial_gc() { 3662 FLAG_SET_DEFAULT(UseSerialGC, true); 3663 UNSUPPORTED_GC_OPTION(UseG1GC); 3664 UNSUPPORTED_GC_OPTION(UseParallelGC); 3665 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3666 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3667 UNSUPPORTED_GC_OPTION(UseParNewGC); 3668 } 3669 #endif // INCLUDE_ALL_GCS 3670 3671 // Sharing support 3672 // Construct the path to the archive 3673 static char* get_shared_archive_path() { 3674 char *shared_archive_path; 3675 if (SharedArchiveFile == NULL) { 3676 char jvm_path[JVM_MAXPATHLEN]; 3677 os::jvm_path(jvm_path, sizeof(jvm_path)); 3678 char *end = strrchr(jvm_path, *os::file_separator()); 3679 if (end != NULL) *end = '\0'; 3680 size_t jvm_path_len = strlen(jvm_path); 3681 size_t file_sep_len = strlen(os::file_separator()); 3682 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3683 file_sep_len + 20, mtInternal); 3684 if (shared_archive_path != NULL) { 3685 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3686 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3687 strncat(shared_archive_path, "classes.jsa", 11); 3688 } 3689 } else { 3690 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3691 if (shared_archive_path != NULL) { 3692 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3693 } 3694 } 3695 return shared_archive_path; 3696 } 3697 3698 #ifndef PRODUCT 3699 // Determine whether LogVMOutput should be implicitly turned on. 3700 static bool use_vm_log() { 3701 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3702 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3703 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3704 PrintAssembly || TraceDeoptimization || TraceDependencies || 3705 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3706 return true; 3707 } 3708 3709 #ifdef COMPILER1 3710 if (PrintC1Statistics) { 3711 return true; 3712 } 3713 #endif // COMPILER1 3714 3715 #ifdef COMPILER2 3716 if (PrintOptoAssembly || PrintOptoStatistics) { 3717 return true; 3718 } 3719 #endif // COMPILER2 3720 3721 return false; 3722 } 3723 #endif // PRODUCT 3724 3725 // Parse entry point called from JNI_CreateJavaVM 3726 3727 jint Arguments::parse(const JavaVMInitArgs* args) { 3728 3729 // Remaining part of option string 3730 const char* tail; 3731 3732 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3733 const char* hotspotrc = ".hotspotrc"; 3734 bool settings_file_specified = false; 3735 bool needs_hotspotrc_warning = false; 3736 3737 const char* flags_file; 3738 int index; 3739 for (index = 0; index < args->nOptions; index++) { 3740 const JavaVMOption *option = args->options + index; 3741 if (ArgumentsExt::process_options(option)) { 3742 continue; 3743 } 3744 if (match_option(option, "-XX:Flags=", &tail)) { 3745 flags_file = tail; 3746 settings_file_specified = true; 3747 continue; 3748 } 3749 if (match_option(option, "-XX:+PrintVMOptions")) { 3750 PrintVMOptions = true; 3751 continue; 3752 } 3753 if (match_option(option, "-XX:-PrintVMOptions")) { 3754 PrintVMOptions = false; 3755 continue; 3756 } 3757 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3758 IgnoreUnrecognizedVMOptions = true; 3759 continue; 3760 } 3761 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3762 IgnoreUnrecognizedVMOptions = false; 3763 continue; 3764 } 3765 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3766 CommandLineFlags::printFlags(tty, false); 3767 vm_exit(0); 3768 } 3769 #if INCLUDE_NMT 3770 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3771 // The launcher did not setup nmt environment variable properly. 3772 if (!MemTracker::check_launcher_nmt_support(tail)) { 3773 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3774 } 3775 3776 // Verify if nmt option is valid. 3777 if (MemTracker::verify_nmt_option()) { 3778 // Late initialization, still in single-threaded mode. 3779 if (MemTracker::tracking_level() >= NMT_summary) { 3780 MemTracker::init(); 3781 } 3782 } else { 3783 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3784 } 3785 continue; 3786 } 3787 #endif 3788 3789 3790 #ifndef PRODUCT 3791 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3792 CommandLineFlags::printFlags(tty, true); 3793 vm_exit(0); 3794 } 3795 #endif 3796 } 3797 3798 if (IgnoreUnrecognizedVMOptions) { 3799 // uncast const to modify the flag args->ignoreUnrecognized 3800 *(jboolean*)(&args->ignoreUnrecognized) = true; 3801 } 3802 3803 // Parse specified settings file 3804 if (settings_file_specified) { 3805 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3806 return JNI_EINVAL; 3807 } 3808 } else { 3809 #ifdef ASSERT 3810 // Parse default .hotspotrc settings file 3811 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3812 return JNI_EINVAL; 3813 } 3814 #else 3815 struct stat buf; 3816 if (os::stat(hotspotrc, &buf) == 0) { 3817 needs_hotspotrc_warning = true; 3818 } 3819 #endif 3820 } 3821 3822 if (PrintVMOptions) { 3823 for (index = 0; index < args->nOptions; index++) { 3824 const JavaVMOption *option = args->options + index; 3825 if (match_option(option, "-XX:", &tail)) { 3826 logOption(tail); 3827 } 3828 } 3829 } 3830 3831 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3832 jint result = parse_vm_init_args(args); 3833 if (result != JNI_OK) { 3834 return result; 3835 } 3836 3837 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3838 SharedArchivePath = get_shared_archive_path(); 3839 if (SharedArchivePath == NULL) { 3840 return JNI_ENOMEM; 3841 } 3842 3843 // Set up VerifySharedSpaces 3844 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 3845 VerifySharedSpaces = true; 3846 } 3847 3848 // Delay warning until here so that we've had a chance to process 3849 // the -XX:-PrintWarnings flag 3850 if (needs_hotspotrc_warning) { 3851 warning("%s file is present but has been ignored. " 3852 "Run with -XX:Flags=%s to load the file.", 3853 hotspotrc, hotspotrc); 3854 } 3855 3856 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3857 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3858 #endif 3859 3860 ArgumentsExt::report_unsupported_options(); 3861 3862 #ifndef PRODUCT 3863 if (TraceBytecodesAt != 0) { 3864 TraceBytecodes = true; 3865 } 3866 if (CountCompiledCalls) { 3867 if (UseCounterDecay) { 3868 warning("UseCounterDecay disabled because CountCalls is set"); 3869 UseCounterDecay = false; 3870 } 3871 } 3872 #endif // PRODUCT 3873 3874 if (ScavengeRootsInCode == 0) { 3875 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3876 warning("forcing ScavengeRootsInCode non-zero"); 3877 } 3878 ScavengeRootsInCode = 1; 3879 } 3880 3881 if (PrintGCDetails) { 3882 // Turn on -verbose:gc options as well 3883 PrintGC = true; 3884 } 3885 3886 // Set object alignment values. 3887 set_object_alignment(); 3888 3889 #if !INCLUDE_ALL_GCS 3890 force_serial_gc(); 3891 #endif // INCLUDE_ALL_GCS 3892 #if !INCLUDE_CDS 3893 if (DumpSharedSpaces || RequireSharedSpaces) { 3894 jio_fprintf(defaultStream::error_stream(), 3895 "Shared spaces are not supported in this VM\n"); 3896 return JNI_ERR; 3897 } 3898 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3899 warning("Shared spaces are not supported in this VM"); 3900 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3901 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3902 } 3903 no_shared_spaces("CDS Disabled"); 3904 #endif // INCLUDE_CDS 3905 3906 return JNI_OK; 3907 } 3908 3909 jint Arguments::apply_ergo() { 3910 3911 // Set flags based on ergonomics. 3912 set_ergonomics_flags(); 3913 3914 set_shared_spaces_flags(); 3915 3916 // Check the GC selections again. 3917 if (!ArgumentsExt::check_gc_consistency_ergo()) { 3918 return JNI_EINVAL; 3919 } 3920 3921 if (TieredCompilation) { 3922 set_tiered_flags(); 3923 } else { 3924 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3925 if (CompilationPolicyChoice >= 2) { 3926 vm_exit_during_initialization( 3927 "Incompatible compilation policy selected", NULL); 3928 } 3929 // Scale CompileThreshold 3930 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 3931 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 3932 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 3933 } 3934 } 3935 3936 #ifdef COMPILER2 3937 #ifndef PRODUCT 3938 if (PrintIdealGraphLevel > 0) { 3939 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 3940 } 3941 #endif 3942 #endif 3943 3944 // Set heap size based on available physical memory 3945 set_heap_size(); 3946 3947 ArgumentsExt::set_gc_specific_flags(); 3948 3949 // Initialize Metaspace flags and alignments 3950 Metaspace::ergo_initialize(); 3951 3952 // Set bytecode rewriting flags 3953 set_bytecode_flags(); 3954 3955 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 3956 set_aggressive_opts_flags(); 3957 3958 // Turn off biased locking for locking debug mode flags, 3959 // which are subtly different from each other but neither works with 3960 // biased locking 3961 if (UseHeavyMonitors 3962 #ifdef COMPILER1 3963 || !UseFastLocking 3964 #endif // COMPILER1 3965 ) { 3966 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3967 // flag set to true on command line; warn the user that they 3968 // can't enable biased locking here 3969 warning("Biased Locking is not supported with locking debug flags" 3970 "; ignoring UseBiasedLocking flag." ); 3971 } 3972 UseBiasedLocking = false; 3973 } 3974 3975 #ifdef ZERO 3976 // Clear flags not supported on zero. 3977 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3978 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3979 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3980 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3981 #endif // CC_INTERP 3982 3983 #ifdef COMPILER2 3984 if (!EliminateLocks) { 3985 EliminateNestedLocks = false; 3986 } 3987 if (!Inline) { 3988 IncrementalInline = false; 3989 } 3990 #ifndef PRODUCT 3991 if (!IncrementalInline) { 3992 AlwaysIncrementalInline = false; 3993 } 3994 #endif 3995 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 3996 // nothing to use the profiling, turn if off 3997 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 3998 } 3999 #endif 4000 4001 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4002 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4003 DebugNonSafepoints = true; 4004 } 4005 4006 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4007 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4008 } 4009 4010 #ifndef PRODUCT 4011 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4012 if (use_vm_log()) { 4013 LogVMOutput = true; 4014 } 4015 } 4016 #endif // PRODUCT 4017 4018 if (PrintCommandLineFlags) { 4019 CommandLineFlags::printSetFlags(tty); 4020 } 4021 4022 // Apply CPU specific policy for the BiasedLocking 4023 if (UseBiasedLocking) { 4024 if (!VM_Version::use_biased_locking() && 4025 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4026 UseBiasedLocking = false; 4027 } 4028 } 4029 #ifdef COMPILER2 4030 if (!UseBiasedLocking || EmitSync != 0) { 4031 UseOptoBiasInlining = false; 4032 } 4033 #endif 4034 4035 return JNI_OK; 4036 } 4037 4038 jint Arguments::adjust_after_os() { 4039 if (UseNUMA) { 4040 if (UseParallelGC || UseParallelOldGC) { 4041 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4042 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4043 } 4044 } 4045 // UseNUMAInterleaving is set to ON for all collectors and 4046 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4047 // such as the parallel collector for Linux and Solaris will 4048 // interleave old gen and survivor spaces on top of NUMA 4049 // allocation policy for the eden space. 4050 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4051 // all platforms and ParallelGC on Windows will interleave all 4052 // of the heap spaces across NUMA nodes. 4053 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4054 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4055 } 4056 } 4057 return JNI_OK; 4058 } 4059 4060 int Arguments::PropertyList_count(SystemProperty* pl) { 4061 int count = 0; 4062 while(pl != NULL) { 4063 count++; 4064 pl = pl->next(); 4065 } 4066 return count; 4067 } 4068 4069 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4070 assert(key != NULL, "just checking"); 4071 SystemProperty* prop; 4072 for (prop = pl; prop != NULL; prop = prop->next()) { 4073 if (strcmp(key, prop->key()) == 0) return prop->value(); 4074 } 4075 return NULL; 4076 } 4077 4078 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4079 int count = 0; 4080 const char* ret_val = NULL; 4081 4082 while(pl != NULL) { 4083 if(count >= index) { 4084 ret_val = pl->key(); 4085 break; 4086 } 4087 count++; 4088 pl = pl->next(); 4089 } 4090 4091 return ret_val; 4092 } 4093 4094 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4095 int count = 0; 4096 char* ret_val = NULL; 4097 4098 while(pl != NULL) { 4099 if(count >= index) { 4100 ret_val = pl->value(); 4101 break; 4102 } 4103 count++; 4104 pl = pl->next(); 4105 } 4106 4107 return ret_val; 4108 } 4109 4110 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4111 SystemProperty* p = *plist; 4112 if (p == NULL) { 4113 *plist = new_p; 4114 } else { 4115 while (p->next() != NULL) { 4116 p = p->next(); 4117 } 4118 p->set_next(new_p); 4119 } 4120 } 4121 4122 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 4123 if (plist == NULL) 4124 return; 4125 4126 SystemProperty* new_p = new SystemProperty(k, v, true); 4127 PropertyList_add(plist, new_p); 4128 } 4129 4130 void Arguments::PropertyList_add(SystemProperty *element) { 4131 PropertyList_add(&_system_properties, element); 4132 } 4133 4134 // This add maintains unique property key in the list. 4135 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 4136 if (plist == NULL) 4137 return; 4138 4139 // If property key exist then update with new value. 4140 SystemProperty* prop; 4141 for (prop = *plist; prop != NULL; prop = prop->next()) { 4142 if (strcmp(k, prop->key()) == 0) { 4143 if (append) { 4144 prop->append_value(v); 4145 } else { 4146 prop->set_value(v); 4147 } 4148 return; 4149 } 4150 } 4151 4152 PropertyList_add(plist, k, v); 4153 } 4154 4155 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4156 // Returns true if all of the source pointed by src has been copied over to 4157 // the destination buffer pointed by buf. Otherwise, returns false. 4158 // Notes: 4159 // 1. If the length (buflen) of the destination buffer excluding the 4160 // NULL terminator character is not long enough for holding the expanded 4161 // pid characters, it also returns false instead of returning the partially 4162 // expanded one. 4163 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4164 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4165 char* buf, size_t buflen) { 4166 const char* p = src; 4167 char* b = buf; 4168 const char* src_end = &src[srclen]; 4169 char* buf_end = &buf[buflen - 1]; 4170 4171 while (p < src_end && b < buf_end) { 4172 if (*p == '%') { 4173 switch (*(++p)) { 4174 case '%': // "%%" ==> "%" 4175 *b++ = *p++; 4176 break; 4177 case 'p': { // "%p" ==> current process id 4178 // buf_end points to the character before the last character so 4179 // that we could write '\0' to the end of the buffer. 4180 size_t buf_sz = buf_end - b + 1; 4181 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4182 4183 // if jio_snprintf fails or the buffer is not long enough to hold 4184 // the expanded pid, returns false. 4185 if (ret < 0 || ret >= (int)buf_sz) { 4186 return false; 4187 } else { 4188 b += ret; 4189 assert(*b == '\0', "fail in copy_expand_pid"); 4190 if (p == src_end && b == buf_end + 1) { 4191 // reach the end of the buffer. 4192 return true; 4193 } 4194 } 4195 p++; 4196 break; 4197 } 4198 default : 4199 *b++ = '%'; 4200 } 4201 } else { 4202 *b++ = *p++; 4203 } 4204 } 4205 *b = '\0'; 4206 return (p == src_end); // return false if not all of the source was copied 4207 }