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 { "AdaptiveSizePausePolicy", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 325 { "ParallelGCRetainPLAB", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 326 { NULL, JDK_Version(0), JDK_Version(0) } 327 }; 328 329 // Returns true if the flag is obsolete and fits into the range specified 330 // for being ignored. In the case that the flag is ignored, the 'version' 331 // value is filled in with the version number when the flag became 332 // obsolete so that that value can be displayed to the user. 333 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 334 int i = 0; 335 assert(version != NULL, "Must provide a version buffer"); 336 while (obsolete_jvm_flags[i].name != NULL) { 337 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 338 // <flag>=xxx form 339 // [-|+]<flag> form 340 size_t len = strlen(flag_status.name); 341 if (((strncmp(flag_status.name, s, len) == 0) && 342 (strlen(s) == len)) || 343 ((s[0] == '+' || s[0] == '-') && 344 (strncmp(flag_status.name, &s[1], len) == 0) && 345 (strlen(&s[1]) == len))) { 346 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 347 *version = flag_status.obsoleted_in; 348 return true; 349 } 350 } 351 i++; 352 } 353 return false; 354 } 355 356 // Constructs the system class path (aka boot class path) from the following 357 // components, in order: 358 // 359 // prefix // from -Xbootclasspath/p:... 360 // base // from os::get_system_properties() or -Xbootclasspath= 361 // suffix // from -Xbootclasspath/a:... 362 // 363 // This could be AllStatic, but it isn't needed after argument processing is 364 // complete. 365 class SysClassPath: public StackObj { 366 public: 367 SysClassPath(const char* base); 368 ~SysClassPath(); 369 370 inline void set_base(const char* base); 371 inline void add_prefix(const char* prefix); 372 inline void add_suffix_to_prefix(const char* suffix); 373 inline void add_suffix(const char* suffix); 374 inline void reset_path(const char* base); 375 376 inline const char* get_base() const { return _items[_scp_base]; } 377 inline const char* get_prefix() const { return _items[_scp_prefix]; } 378 inline const char* get_suffix() const { return _items[_scp_suffix]; } 379 380 // Combine all the components into a single c-heap-allocated string; caller 381 // must free the string if/when no longer needed. 382 char* combined_path(); 383 384 private: 385 // Utility routines. 386 static char* add_to_path(const char* path, const char* str, bool prepend); 387 static char* add_jars_to_path(char* path, const char* directory); 388 389 inline void reset_item_at(int index); 390 391 // Array indices for the items that make up the sysclasspath. All except the 392 // base are allocated in the C heap and freed by this class. 393 enum { 394 _scp_prefix, // from -Xbootclasspath/p:... 395 _scp_base, // the default sysclasspath 396 _scp_suffix, // from -Xbootclasspath/a:... 397 _scp_nitems // the number of items, must be last. 398 }; 399 400 const char* _items[_scp_nitems]; 401 }; 402 403 SysClassPath::SysClassPath(const char* base) { 404 memset(_items, 0, sizeof(_items)); 405 _items[_scp_base] = base; 406 } 407 408 SysClassPath::~SysClassPath() { 409 // Free everything except the base. 410 for (int i = 0; i < _scp_nitems; ++i) { 411 if (i != _scp_base) reset_item_at(i); 412 } 413 } 414 415 inline void SysClassPath::set_base(const char* base) { 416 _items[_scp_base] = base; 417 } 418 419 inline void SysClassPath::add_prefix(const char* prefix) { 420 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 421 } 422 423 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 424 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 425 } 426 427 inline void SysClassPath::add_suffix(const char* suffix) { 428 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 429 } 430 431 inline void SysClassPath::reset_item_at(int index) { 432 assert(index < _scp_nitems && index != _scp_base, "just checking"); 433 if (_items[index] != NULL) { 434 FREE_C_HEAP_ARRAY(char, _items[index]); 435 _items[index] = NULL; 436 } 437 } 438 439 inline void SysClassPath::reset_path(const char* base) { 440 // Clear the prefix and suffix. 441 reset_item_at(_scp_prefix); 442 reset_item_at(_scp_suffix); 443 set_base(base); 444 } 445 446 //------------------------------------------------------------------------------ 447 448 449 // Combine the bootclasspath elements, some of which may be null, into a single 450 // c-heap-allocated string. 451 char* SysClassPath::combined_path() { 452 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 453 454 size_t lengths[_scp_nitems]; 455 size_t total_len = 0; 456 457 const char separator = *os::path_separator(); 458 459 // Get the lengths. 460 int i; 461 for (i = 0; i < _scp_nitems; ++i) { 462 if (_items[i] != NULL) { 463 lengths[i] = strlen(_items[i]); 464 // Include space for the separator char (or a NULL for the last item). 465 total_len += lengths[i] + 1; 466 } 467 } 468 assert(total_len > 0, "empty sysclasspath not allowed"); 469 470 // Copy the _items to a single string. 471 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 472 char* cp_tmp = cp; 473 for (i = 0; i < _scp_nitems; ++i) { 474 if (_items[i] != NULL) { 475 memcpy(cp_tmp, _items[i], lengths[i]); 476 cp_tmp += lengths[i]; 477 *cp_tmp++ = separator; 478 } 479 } 480 *--cp_tmp = '\0'; // Replace the extra separator. 481 return cp; 482 } 483 484 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 485 char* 486 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 487 char *cp; 488 489 assert(str != NULL, "just checking"); 490 if (path == NULL) { 491 size_t len = strlen(str) + 1; 492 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 493 memcpy(cp, str, len); // copy the trailing null 494 } else { 495 const char separator = *os::path_separator(); 496 size_t old_len = strlen(path); 497 size_t str_len = strlen(str); 498 size_t len = old_len + str_len + 2; 499 500 if (prepend) { 501 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 502 char* cp_tmp = cp; 503 memcpy(cp_tmp, str, str_len); 504 cp_tmp += str_len; 505 *cp_tmp = separator; 506 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 507 FREE_C_HEAP_ARRAY(char, path); 508 } else { 509 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 510 char* cp_tmp = cp + old_len; 511 *cp_tmp = separator; 512 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 513 } 514 } 515 return cp; 516 } 517 518 // Scan the directory and append any jar or zip files found to path. 519 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 520 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 521 DIR* dir = os::opendir(directory); 522 if (dir == NULL) return path; 523 524 char dir_sep[2] = { '\0', '\0' }; 525 size_t directory_len = strlen(directory); 526 const char fileSep = *os::file_separator(); 527 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 528 529 /* Scan the directory for jars/zips, appending them to path. */ 530 struct dirent *entry; 531 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 532 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 533 const char* name = entry->d_name; 534 const char* ext = name + strlen(name) - 4; 535 bool isJarOrZip = ext > name && 536 (os::file_name_strcmp(ext, ".jar") == 0 || 537 os::file_name_strcmp(ext, ".zip") == 0); 538 if (isJarOrZip) { 539 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 540 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 541 path = add_to_path(path, jarpath, false); 542 FREE_C_HEAP_ARRAY(char, jarpath); 543 } 544 } 545 FREE_C_HEAP_ARRAY(char, dbuf); 546 os::closedir(dir); 547 return path; 548 } 549 550 // Parses a memory size specification string. 551 static bool atomull(const char *s, julong* result) { 552 julong n = 0; 553 int args_read = 0; 554 bool is_hex = false; 555 // Skip leading 0[xX] for hexadecimal 556 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) { 557 s += 2; 558 is_hex = true; 559 args_read = sscanf(s, JULONG_FORMAT_X, &n); 560 } else { 561 args_read = sscanf(s, JULONG_FORMAT, &n); 562 } 563 if (args_read != 1) { 564 return false; 565 } 566 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) { 567 s++; 568 } 569 // 4705540: illegal if more characters are found after the first non-digit 570 if (strlen(s) > 1) { 571 return false; 572 } 573 switch (*s) { 574 case 'T': case 't': 575 *result = n * G * K; 576 // Check for overflow. 577 if (*result/((julong)G * K) != n) return false; 578 return true; 579 case 'G': case 'g': 580 *result = n * G; 581 if (*result/G != n) return false; 582 return true; 583 case 'M': case 'm': 584 *result = n * M; 585 if (*result/M != n) return false; 586 return true; 587 case 'K': case 'k': 588 *result = n * K; 589 if (*result/K != n) return false; 590 return true; 591 case '\0': 592 *result = n; 593 return true; 594 default: 595 return false; 596 } 597 } 598 599 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 600 if (size < min_size) return arg_too_small; 601 // Check that size will fit in a size_t (only relevant on 32-bit) 602 if (size > max_uintx) return arg_too_big; 603 return arg_in_range; 604 } 605 606 // Describe an argument out of range error 607 void Arguments::describe_range_error(ArgsRange errcode) { 608 switch(errcode) { 609 case arg_too_big: 610 jio_fprintf(defaultStream::error_stream(), 611 "The specified size exceeds the maximum " 612 "representable size.\n"); 613 break; 614 case arg_too_small: 615 case arg_unreadable: 616 case arg_in_range: 617 // do nothing for now 618 break; 619 default: 620 ShouldNotReachHere(); 621 } 622 } 623 624 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) { 625 return CommandLineFlags::boolAtPut(name, &value, origin); 626 } 627 628 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 629 double v; 630 if (sscanf(value, "%lf", &v) != 1) { 631 return false; 632 } 633 634 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 635 return true; 636 } 637 return false; 638 } 639 640 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 641 julong v; 642 intx intx_v; 643 bool is_neg = false; 644 // Check the sign first since atomull() parses only unsigned values. 645 if (*value == '-') { 646 if (!CommandLineFlags::intxAt(name, &intx_v)) { 647 return false; 648 } 649 value++; 650 is_neg = true; 651 } 652 if (!atomull(value, &v)) { 653 return false; 654 } 655 intx_v = (intx) v; 656 if (is_neg) { 657 intx_v = -intx_v; 658 } 659 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 660 return true; 661 } 662 uintx uintx_v = (uintx) v; 663 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 664 return true; 665 } 666 uint64_t uint64_t_v = (uint64_t) v; 667 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 668 return true; 669 } 670 size_t size_t_v = (size_t) v; 671 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) { 672 return true; 673 } 674 return false; 675 } 676 677 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 678 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 679 // Contract: CommandLineFlags always returns a pointer that needs freeing. 680 FREE_C_HEAP_ARRAY(char, value); 681 return true; 682 } 683 684 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 685 const char* old_value = ""; 686 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 687 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 688 size_t new_len = strlen(new_value); 689 const char* value; 690 char* free_this_too = NULL; 691 if (old_len == 0) { 692 value = new_value; 693 } else if (new_len == 0) { 694 value = old_value; 695 } else { 696 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 697 // each new setting adds another LINE to the switch: 698 sprintf(buf, "%s\n%s", old_value, new_value); 699 value = buf; 700 free_this_too = buf; 701 } 702 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 703 // CommandLineFlags always returns a pointer that needs freeing. 704 FREE_C_HEAP_ARRAY(char, value); 705 if (free_this_too != NULL) { 706 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 707 FREE_C_HEAP_ARRAY(char, free_this_too); 708 } 709 return true; 710 } 711 712 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 713 714 // range of acceptable characters spelled out for portability reasons 715 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 716 #define BUFLEN 255 717 char name[BUFLEN+1]; 718 char dummy; 719 720 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 721 return set_bool_flag(name, false, origin); 722 } 723 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 724 return set_bool_flag(name, true, origin); 725 } 726 727 char punct; 728 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 729 const char* value = strchr(arg, '=') + 1; 730 Flag* flag = Flag::find_flag(name, strlen(name)); 731 if (flag != NULL && flag->is_ccstr()) { 732 if (flag->ccstr_accumulates()) { 733 return append_to_string_flag(name, value, origin); 734 } else { 735 if (value[0] == '\0') { 736 value = NULL; 737 } 738 return set_string_flag(name, value, origin); 739 } 740 } 741 } 742 743 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 744 const char* value = strchr(arg, '=') + 1; 745 // -XX:Foo:=xxx will reset the string flag to the given value. 746 if (value[0] == '\0') { 747 value = NULL; 748 } 749 return set_string_flag(name, value, origin); 750 } 751 752 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 753 #define SIGNED_NUMBER_RANGE "[-0123456789]" 754 #define NUMBER_RANGE "[0123456789]" 755 char value[BUFLEN + 1]; 756 char value2[BUFLEN + 1]; 757 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 758 // Looks like a floating-point number -- try again with more lenient format string 759 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 760 return set_fp_numeric_flag(name, value, origin); 761 } 762 } 763 764 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 765 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 766 return set_numeric_flag(name, value, origin); 767 } 768 769 return false; 770 } 771 772 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 773 assert(bldarray != NULL, "illegal argument"); 774 775 if (arg == NULL) { 776 return; 777 } 778 779 int new_count = *count + 1; 780 781 // expand the array and add arg to the last element 782 if (*bldarray == NULL) { 783 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 784 } else { 785 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 786 } 787 (*bldarray)[*count] = os::strdup_check_oom(arg); 788 *count = new_count; 789 } 790 791 void Arguments::build_jvm_args(const char* arg) { 792 add_string(&_jvm_args_array, &_num_jvm_args, arg); 793 } 794 795 void Arguments::build_jvm_flags(const char* arg) { 796 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 797 } 798 799 // utility function to return a string that concatenates all 800 // strings in a given char** array 801 const char* Arguments::build_resource_string(char** args, int count) { 802 if (args == NULL || count == 0) { 803 return NULL; 804 } 805 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 806 for (int i = 1; i < count; i++) { 807 length += strlen(args[i]) + 1; // add 1 for a space 808 } 809 char* s = NEW_RESOURCE_ARRAY(char, length); 810 strcpy(s, args[0]); 811 for (int j = 1; j < count; j++) { 812 strcat(s, " "); 813 strcat(s, args[j]); 814 } 815 return (const char*) s; 816 } 817 818 void Arguments::print_on(outputStream* st) { 819 st->print_cr("VM Arguments:"); 820 if (num_jvm_flags() > 0) { 821 st->print("jvm_flags: "); print_jvm_flags_on(st); 822 } 823 if (num_jvm_args() > 0) { 824 st->print("jvm_args: "); print_jvm_args_on(st); 825 } 826 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 827 if (_java_class_path != NULL) { 828 char* path = _java_class_path->value(); 829 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 830 } 831 st->print_cr("Launcher Type: %s", _sun_java_launcher); 832 } 833 834 void Arguments::print_jvm_flags_on(outputStream* st) { 835 if (_num_jvm_flags > 0) { 836 for (int i=0; i < _num_jvm_flags; i++) { 837 st->print("%s ", _jvm_flags_array[i]); 838 } 839 st->cr(); 840 } 841 } 842 843 void Arguments::print_jvm_args_on(outputStream* st) { 844 if (_num_jvm_args > 0) { 845 for (int i=0; i < _num_jvm_args; i++) { 846 st->print("%s ", _jvm_args_array[i]); 847 } 848 st->cr(); 849 } 850 } 851 852 bool Arguments::process_argument(const char* arg, 853 jboolean ignore_unrecognized, Flag::Flags origin) { 854 855 JDK_Version since = JDK_Version(); 856 857 if (parse_argument(arg, origin) || ignore_unrecognized) { 858 return true; 859 } 860 861 bool has_plus_minus = (*arg == '+' || *arg == '-'); 862 const char* const argname = has_plus_minus ? arg + 1 : arg; 863 if (is_newly_obsolete(arg, &since)) { 864 char version[256]; 865 since.to_string(version, sizeof(version)); 866 warning("ignoring option %s; support was removed in %s", argname, version); 867 return true; 868 } 869 870 // For locked flags, report a custom error message if available. 871 // Otherwise, report the standard unrecognized VM option. 872 873 size_t arg_len; 874 const char* equal_sign = strchr(argname, '='); 875 if (equal_sign == NULL) { 876 arg_len = strlen(argname); 877 } else { 878 arg_len = equal_sign - argname; 879 } 880 881 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 882 if (found_flag != NULL) { 883 char locked_message_buf[BUFLEN]; 884 found_flag->get_locked_message(locked_message_buf, BUFLEN); 885 if (strlen(locked_message_buf) == 0) { 886 if (found_flag->is_bool() && !has_plus_minus) { 887 jio_fprintf(defaultStream::error_stream(), 888 "Missing +/- setting for VM option '%s'\n", argname); 889 } else if (!found_flag->is_bool() && has_plus_minus) { 890 jio_fprintf(defaultStream::error_stream(), 891 "Unexpected +/- setting in VM option '%s'\n", argname); 892 } else { 893 jio_fprintf(defaultStream::error_stream(), 894 "Improperly specified VM option '%s'\n", argname); 895 } 896 } else { 897 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 898 } 899 } else { 900 jio_fprintf(defaultStream::error_stream(), 901 "Unrecognized VM option '%s'\n", argname); 902 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 903 if (fuzzy_matched != NULL) { 904 jio_fprintf(defaultStream::error_stream(), 905 "Did you mean '%s%s%s'? ", 906 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 907 fuzzy_matched->_name, 908 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 909 if (is_newly_obsolete(fuzzy_matched->_name, &since)) { 910 char version[256]; 911 since.to_string(version, sizeof(version)); 912 jio_fprintf(defaultStream::error_stream(), 913 "Warning: support for %s was removed in %s\n", 914 fuzzy_matched->_name, 915 version); 916 } 917 } 918 } 919 920 // allow for commandline "commenting out" options like -XX:#+Verbose 921 return arg[0] == '#'; 922 } 923 924 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 925 FILE* stream = fopen(file_name, "rb"); 926 if (stream == NULL) { 927 if (should_exist) { 928 jio_fprintf(defaultStream::error_stream(), 929 "Could not open settings file %s\n", file_name); 930 return false; 931 } else { 932 return true; 933 } 934 } 935 936 char token[1024]; 937 int pos = 0; 938 939 bool in_white_space = true; 940 bool in_comment = false; 941 bool in_quote = false; 942 char quote_c = 0; 943 bool result = true; 944 945 int c = getc(stream); 946 while(c != EOF && pos < (int)(sizeof(token)-1)) { 947 if (in_white_space) { 948 if (in_comment) { 949 if (c == '\n') in_comment = false; 950 } else { 951 if (c == '#') in_comment = true; 952 else if (!isspace(c)) { 953 in_white_space = false; 954 token[pos++] = c; 955 } 956 } 957 } else { 958 if (c == '\n' || (!in_quote && isspace(c))) { 959 // token ends at newline, or at unquoted whitespace 960 // this allows a way to include spaces in string-valued options 961 token[pos] = '\0'; 962 logOption(token); 963 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 964 build_jvm_flags(token); 965 pos = 0; 966 in_white_space = true; 967 in_quote = false; 968 } else if (!in_quote && (c == '\'' || c == '"')) { 969 in_quote = true; 970 quote_c = c; 971 } else if (in_quote && (c == quote_c)) { 972 in_quote = false; 973 } else { 974 token[pos++] = c; 975 } 976 } 977 c = getc(stream); 978 } 979 if (pos > 0) { 980 token[pos] = '\0'; 981 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 982 build_jvm_flags(token); 983 } 984 fclose(stream); 985 return result; 986 } 987 988 //============================================================================================================= 989 // Parsing of properties (-D) 990 991 const char* Arguments::get_property(const char* key) { 992 return PropertyList_get_value(system_properties(), key); 993 } 994 995 bool Arguments::add_property(const char* prop) { 996 const char* eq = strchr(prop, '='); 997 char* key; 998 // ns must be static--its address may be stored in a SystemProperty object. 999 const static char ns[1] = {0}; 1000 char* value = (char *)ns; 1001 1002 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 1003 key = AllocateHeap(key_len + 1, mtInternal); 1004 strncpy(key, prop, key_len); 1005 key[key_len] = '\0'; 1006 1007 if (eq != NULL) { 1008 size_t value_len = strlen(prop) - key_len - 1; 1009 value = AllocateHeap(value_len + 1, mtInternal); 1010 strncpy(value, &prop[key_len + 1], value_len + 1); 1011 } 1012 1013 if (strcmp(key, "java.compiler") == 0) { 1014 process_java_compiler_argument(value); 1015 FreeHeap(key); 1016 if (eq != NULL) { 1017 FreeHeap(value); 1018 } 1019 return true; 1020 } else if (strcmp(key, "sun.java.command") == 0) { 1021 _java_command = value; 1022 1023 // Record value in Arguments, but let it get passed to Java. 1024 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1025 strcmp(key, "sun.java.launcher.pid") == 0) { 1026 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1027 // private and are processed in process_sun_java_launcher_properties(); 1028 // the sun.java.launcher property is passed on to the java application 1029 FreeHeap(key); 1030 if (eq != NULL) { 1031 FreeHeap(value); 1032 } 1033 return true; 1034 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1035 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1036 // its value without going through the property list or making a Java call. 1037 _java_vendor_url_bug = value; 1038 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1039 PropertyList_unique_add(&_system_properties, key, value, true); 1040 return true; 1041 } 1042 // Create new property and add at the end of the list 1043 PropertyList_unique_add(&_system_properties, key, value); 1044 return true; 1045 } 1046 1047 //=========================================================================================================== 1048 // Setting int/mixed/comp mode flags 1049 1050 void Arguments::set_mode_flags(Mode mode) { 1051 // Set up default values for all flags. 1052 // If you add a flag to any of the branches below, 1053 // add a default value for it here. 1054 set_java_compiler(false); 1055 _mode = mode; 1056 1057 // Ensure Agent_OnLoad has the correct initial values. 1058 // This may not be the final mode; mode may change later in onload phase. 1059 PropertyList_unique_add(&_system_properties, "java.vm.info", 1060 (char*)VM_Version::vm_info_string(), false); 1061 1062 UseInterpreter = true; 1063 UseCompiler = true; 1064 UseLoopCounter = true; 1065 1066 // Default values may be platform/compiler dependent - 1067 // use the saved values 1068 ClipInlining = Arguments::_ClipInlining; 1069 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1070 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1071 BackgroundCompilation = Arguments::_BackgroundCompilation; 1072 1073 // Change from defaults based on mode 1074 switch (mode) { 1075 default: 1076 ShouldNotReachHere(); 1077 break; 1078 case _int: 1079 UseCompiler = false; 1080 UseLoopCounter = false; 1081 AlwaysCompileLoopMethods = false; 1082 UseOnStackReplacement = false; 1083 break; 1084 case _mixed: 1085 // same as default 1086 break; 1087 case _comp: 1088 UseInterpreter = false; 1089 BackgroundCompilation = false; 1090 ClipInlining = false; 1091 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1092 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1093 // compile a level 4 (C2) and then continue executing it. 1094 if (TieredCompilation) { 1095 Tier3InvokeNotifyFreqLog = 0; 1096 Tier4InvocationThreshold = 0; 1097 } 1098 break; 1099 } 1100 } 1101 1102 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1103 // Conflict: required to use shared spaces (-Xshare:on), but 1104 // incompatible command line options were chosen. 1105 1106 static void no_shared_spaces(const char* message) { 1107 if (RequireSharedSpaces) { 1108 jio_fprintf(defaultStream::error_stream(), 1109 "Class data sharing is inconsistent with other specified options.\n"); 1110 vm_exit_during_initialization("Unable to use shared archive.", message); 1111 } else { 1112 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1113 } 1114 } 1115 #endif 1116 1117 // Returns threshold scaled with the value of scale. 1118 // If scale < 0.0, threshold is returned without scaling. 1119 intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1120 if (scale == 1.0 || scale < 0.0) { 1121 return threshold; 1122 } else { 1123 return (intx)(threshold * scale); 1124 } 1125 } 1126 1127 // Returns freq_log scaled with the value of scale. 1128 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1129 // If scale < 0.0, freq_log is returned without scaling. 1130 intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1131 // Check if scaling is necessary or if negative value was specified. 1132 if (scale == 1.0 || scale < 0.0) { 1133 return freq_log; 1134 } 1135 // Check values to avoid calculating log2 of 0. 1136 if (scale == 0.0 || freq_log == 0) { 1137 return 0; 1138 } 1139 // Determine the maximum notification frequency value currently supported. 1140 // The largest mask value that the interpreter/C1 can handle is 1141 // of length InvocationCounter::number_of_count_bits. Mask values are always 1142 // one bit shorter then the value of the notification frequency. Set 1143 // max_freq_bits accordingly. 1144 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1145 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1146 if (scaled_freq == 0) { 1147 // Return 0 right away to avoid calculating log2 of 0. 1148 return 0; 1149 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1150 return max_freq_bits; 1151 } else { 1152 return log2_intptr(scaled_freq); 1153 } 1154 } 1155 1156 void Arguments::set_tiered_flags() { 1157 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1158 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1159 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1160 } 1161 if (CompilationPolicyChoice < 2) { 1162 vm_exit_during_initialization( 1163 "Incompatible compilation policy selected", NULL); 1164 } 1165 // Increase the code cache size - tiered compiles a lot more. 1166 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1167 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1168 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1169 } 1170 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1171 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1172 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1173 1174 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1175 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap) 1176 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) { 1177 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1178 } 1179 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) { 1180 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1181 } 1182 // Check consistency of code heap sizes 1183 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 1184 jio_fprintf(defaultStream::error_stream(), 1185 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 1186 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 1187 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 1188 vm_exit(1); 1189 } 1190 } 1191 } 1192 if (!UseInterpreter) { // -Xcomp 1193 Tier3InvokeNotifyFreqLog = 0; 1194 Tier4InvocationThreshold = 0; 1195 } 1196 1197 if (CompileThresholdScaling < 0) { 1198 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1199 } 1200 1201 // Scale tiered compilation thresholds. 1202 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1203 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1204 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1205 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1206 1207 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1208 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1209 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1210 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1211 1212 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1213 // once these thresholds become supported. 1214 1215 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1216 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1217 1218 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1219 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1220 1221 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1222 1223 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1224 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1225 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1226 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1227 } 1228 } 1229 1230 /** 1231 * Returns the minimum number of compiler threads needed to run the JVM. The following 1232 * configurations are possible. 1233 * 1234 * 1) The JVM is build using an interpreter only. As a result, the minimum number of 1235 * compiler threads is 0. 1236 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As 1237 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1. 1238 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However, 1239 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only 1240 * C1 can be used, so the minimum number of compiler threads is 1. 1241 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option 1242 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result, 1243 * the minimum number of compiler threads is 2. 1244 */ 1245 int Arguments::get_min_number_of_compiler_threads() { 1246 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 1247 return 0; // case 1 1248 #else 1249 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) { 1250 return 1; // case 2 or case 3 1251 } 1252 return 2; // case 4 (tiered) 1253 #endif 1254 } 1255 1256 #if INCLUDE_ALL_GCS 1257 static void disable_adaptive_size_policy(const char* collector_name) { 1258 if (UseAdaptiveSizePolicy) { 1259 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1260 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1261 collector_name); 1262 } 1263 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1264 } 1265 } 1266 1267 void Arguments::set_parnew_gc_flags() { 1268 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1269 "control point invariant"); 1270 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1271 assert(UseParNewGC, "ParNew should always be used with CMS"); 1272 1273 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1274 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1275 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1276 } else if (ParallelGCThreads == 0) { 1277 jio_fprintf(defaultStream::error_stream(), 1278 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1279 vm_exit(1); 1280 } 1281 1282 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1283 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1284 // we set them to 1024 and 1024. 1285 // See CR 6362902. 1286 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1287 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1288 } 1289 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1290 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1291 } 1292 1293 // When using compressed oops, we use local overflow stacks, 1294 // rather than using a global overflow list chained through 1295 // the klass word of the object's pre-image. 1296 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1297 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1298 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1299 } 1300 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1301 } 1302 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1303 } 1304 1305 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1306 // sparc/solaris for certain applications, but would gain from 1307 // further optimization and tuning efforts, and would almost 1308 // certainly gain from analysis of platform and environment. 1309 void Arguments::set_cms_and_parnew_gc_flags() { 1310 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1311 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1312 assert(UseParNewGC, "ParNew should always be used with CMS"); 1313 1314 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1315 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1316 1317 set_parnew_gc_flags(); 1318 1319 size_t max_heap = align_size_down(MaxHeapSize, 1320 CardTableRS::ct_max_alignment_constraint()); 1321 1322 // Now make adjustments for CMS 1323 intx tenuring_default = (intx)6; 1324 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1325 1326 // Preferred young gen size for "short" pauses: 1327 // upper bound depends on # of threads and NewRatio. 1328 const uintx parallel_gc_threads = 1329 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1330 const size_t preferred_max_new_size_unaligned = 1331 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1332 size_t preferred_max_new_size = 1333 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1334 1335 // Unless explicitly requested otherwise, size young gen 1336 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1337 1338 // If either MaxNewSize or NewRatio is set on the command line, 1339 // assume the user is trying to set the size of the young gen. 1340 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1341 1342 // Set MaxNewSize to our calculated preferred_max_new_size unless 1343 // NewSize was set on the command line and it is larger than 1344 // preferred_max_new_size. 1345 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1346 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1347 } else { 1348 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1349 } 1350 if (PrintGCDetails && Verbose) { 1351 // Too early to use gclog_or_tty 1352 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1353 } 1354 1355 // Code along this path potentially sets NewSize and OldSize 1356 if (PrintGCDetails && Verbose) { 1357 // Too early to use gclog_or_tty 1358 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1359 " initial_heap_size: " SIZE_FORMAT 1360 " max_heap: " SIZE_FORMAT, 1361 min_heap_size(), InitialHeapSize, max_heap); 1362 } 1363 size_t min_new = preferred_max_new_size; 1364 if (FLAG_IS_CMDLINE(NewSize)) { 1365 min_new = NewSize; 1366 } 1367 if (max_heap > min_new && min_heap_size() > min_new) { 1368 // Unless explicitly requested otherwise, make young gen 1369 // at least min_new, and at most preferred_max_new_size. 1370 if (FLAG_IS_DEFAULT(NewSize)) { 1371 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1372 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1373 if (PrintGCDetails && Verbose) { 1374 // Too early to use gclog_or_tty 1375 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1376 } 1377 } 1378 // Unless explicitly requested otherwise, size old gen 1379 // so it's NewRatio x of NewSize. 1380 if (FLAG_IS_DEFAULT(OldSize)) { 1381 if (max_heap > NewSize) { 1382 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1383 if (PrintGCDetails && Verbose) { 1384 // Too early to use gclog_or_tty 1385 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1386 } 1387 } 1388 } 1389 } 1390 } 1391 // Unless explicitly requested otherwise, definitely 1392 // promote all objects surviving "tenuring_default" scavenges. 1393 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1394 FLAG_IS_DEFAULT(SurvivorRatio)) { 1395 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1396 } 1397 // If we decided above (or user explicitly requested) 1398 // `promote all' (via MaxTenuringThreshold := 0), 1399 // prefer minuscule survivor spaces so as not to waste 1400 // space for (non-existent) survivors 1401 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1402 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1403 } 1404 1405 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1406 // but rather the number of free blocks of a given size that are used when 1407 // replenishing the local per-worker free list caches. 1408 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1409 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1410 // OldPLAB sizing manually turned off: Use a larger default setting, 1411 // unless it was manually specified. This is because a too-low value 1412 // will slow down scavenges. 1413 FLAG_SET_ERGO(uintx, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166 1414 } else { 1415 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1416 } 1417 } 1418 1419 // If either of the static initialization defaults have changed, note this 1420 // modification. 1421 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1422 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1423 } 1424 if (PrintGCDetails && Verbose) { 1425 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1426 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1427 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1428 } 1429 } 1430 #endif // INCLUDE_ALL_GCS 1431 1432 void set_object_alignment() { 1433 // Object alignment. 1434 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1435 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1436 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1437 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1438 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1439 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1440 1441 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1442 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1443 1444 // Oop encoding heap max 1445 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1446 1447 #if INCLUDE_ALL_GCS 1448 // Set CMS global values 1449 CompactibleFreeListSpace::set_cms_values(); 1450 #endif // INCLUDE_ALL_GCS 1451 } 1452 1453 bool verify_object_alignment() { 1454 // Object alignment. 1455 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1456 jio_fprintf(defaultStream::error_stream(), 1457 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1458 (int)ObjectAlignmentInBytes); 1459 return false; 1460 } 1461 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1462 jio_fprintf(defaultStream::error_stream(), 1463 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1464 (int)ObjectAlignmentInBytes, BytesPerLong); 1465 return false; 1466 } 1467 // It does not make sense to have big object alignment 1468 // since a space lost due to alignment will be greater 1469 // then a saved space from compressed oops. 1470 if ((int)ObjectAlignmentInBytes > 256) { 1471 jio_fprintf(defaultStream::error_stream(), 1472 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1473 (int)ObjectAlignmentInBytes); 1474 return false; 1475 } 1476 // In case page size is very small. 1477 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1478 jio_fprintf(defaultStream::error_stream(), 1479 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1480 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1481 return false; 1482 } 1483 if(SurvivorAlignmentInBytes == 0) { 1484 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1485 } else { 1486 if (!is_power_of_2(SurvivorAlignmentInBytes)) { 1487 jio_fprintf(defaultStream::error_stream(), 1488 "error: SurvivorAlignmentInBytes=%d must be power of 2\n", 1489 (int)SurvivorAlignmentInBytes); 1490 return false; 1491 } 1492 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) { 1493 jio_fprintf(defaultStream::error_stream(), 1494 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n", 1495 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes); 1496 return false; 1497 } 1498 } 1499 return true; 1500 } 1501 1502 size_t Arguments::max_heap_for_compressed_oops() { 1503 // Avoid sign flip. 1504 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1505 // We need to fit both the NULL page and the heap into the memory budget, while 1506 // keeping alignment constraints of the heap. To guarantee the latter, as the 1507 // NULL page is located before the heap, we pad the NULL page to the conservative 1508 // maximum alignment that the GC may ever impose upon the heap. 1509 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1510 _conservative_max_heap_alignment); 1511 1512 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1513 NOT_LP64(ShouldNotReachHere(); return 0); 1514 } 1515 1516 bool Arguments::should_auto_select_low_pause_collector() { 1517 if (UseAutoGCSelectPolicy && 1518 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1519 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1520 if (PrintGCDetails) { 1521 // Cannot use gclog_or_tty yet. 1522 tty->print_cr("Automatic selection of the low pause collector" 1523 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1524 } 1525 return true; 1526 } 1527 return false; 1528 } 1529 1530 void Arguments::set_use_compressed_oops() { 1531 #ifndef ZERO 1532 #ifdef _LP64 1533 // MaxHeapSize is not set up properly at this point, but 1534 // the only value that can override MaxHeapSize if we are 1535 // to use UseCompressedOops is InitialHeapSize. 1536 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1537 1538 if (max_heap_size <= max_heap_for_compressed_oops()) { 1539 #if !defined(COMPILER1) || defined(TIERED) 1540 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1541 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1542 } 1543 #endif 1544 } else { 1545 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1546 warning("Max heap size too large for Compressed Oops"); 1547 FLAG_SET_DEFAULT(UseCompressedOops, false); 1548 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1549 } 1550 } 1551 #endif // _LP64 1552 #endif // ZERO 1553 } 1554 1555 1556 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1557 // set_use_compressed_oops(). 1558 void Arguments::set_use_compressed_klass_ptrs() { 1559 #ifndef ZERO 1560 #ifdef _LP64 1561 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1562 if (!UseCompressedOops) { 1563 if (UseCompressedClassPointers) { 1564 warning("UseCompressedClassPointers requires UseCompressedOops"); 1565 } 1566 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1567 } else { 1568 // Turn on UseCompressedClassPointers too 1569 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1570 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1571 } 1572 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1573 if (UseCompressedClassPointers) { 1574 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1575 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1576 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1577 } 1578 } 1579 } 1580 #endif // _LP64 1581 #endif // !ZERO 1582 } 1583 1584 void Arguments::set_conservative_max_heap_alignment() { 1585 // The conservative maximum required alignment for the heap is the maximum of 1586 // the alignments imposed by several sources: any requirements from the heap 1587 // itself, the collector policy and the maximum page size we may run the VM 1588 // with. 1589 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1590 #if INCLUDE_ALL_GCS 1591 if (UseParallelGC) { 1592 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1593 } else if (UseG1GC) { 1594 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1595 } 1596 #endif // INCLUDE_ALL_GCS 1597 _conservative_max_heap_alignment = MAX4(heap_alignment, 1598 (size_t)os::vm_allocation_granularity(), 1599 os::max_page_size(), 1600 CollectorPolicy::compute_heap_alignment()); 1601 } 1602 1603 void Arguments::select_gc_ergonomically() { 1604 if (os::is_server_class_machine()) { 1605 if (should_auto_select_low_pause_collector()) { 1606 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1607 } else { 1608 FLAG_SET_ERGO(bool, UseParallelGC, true); 1609 } 1610 } 1611 } 1612 1613 void Arguments::select_gc() { 1614 if (!gc_selected()) { 1615 ArgumentsExt::select_gc_ergonomically(); 1616 } 1617 } 1618 1619 void Arguments::set_ergonomics_flags() { 1620 select_gc(); 1621 1622 #ifdef COMPILER2 1623 // Shared spaces work fine with other GCs but causes bytecode rewriting 1624 // to be disabled, which hurts interpreter performance and decreases 1625 // server performance. When -server is specified, keep the default off 1626 // unless it is asked for. Future work: either add bytecode rewriting 1627 // at link time, or rewrite bytecodes in non-shared methods. 1628 if (!DumpSharedSpaces && !RequireSharedSpaces && 1629 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1630 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1631 } 1632 #endif 1633 1634 set_conservative_max_heap_alignment(); 1635 1636 #ifndef ZERO 1637 #ifdef _LP64 1638 set_use_compressed_oops(); 1639 1640 // set_use_compressed_klass_ptrs() must be called after calling 1641 // set_use_compressed_oops(). 1642 set_use_compressed_klass_ptrs(); 1643 1644 // Also checks that certain machines are slower with compressed oops 1645 // in vm_version initialization code. 1646 #endif // _LP64 1647 #endif // !ZERO 1648 } 1649 1650 void Arguments::set_parallel_gc_flags() { 1651 assert(UseParallelGC || UseParallelOldGC, "Error"); 1652 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1653 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1654 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1655 } 1656 FLAG_SET_DEFAULT(UseParallelGC, true); 1657 1658 // If no heap maximum was requested explicitly, use some reasonable fraction 1659 // of the physical memory, up to a maximum of 1GB. 1660 FLAG_SET_DEFAULT(ParallelGCThreads, 1661 Abstract_VM_Version::parallel_worker_threads()); 1662 if (ParallelGCThreads == 0) { 1663 jio_fprintf(defaultStream::error_stream(), 1664 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1665 vm_exit(1); 1666 } 1667 1668 if (UseAdaptiveSizePolicy) { 1669 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1670 // unless the user actually sets these flags. 1671 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1672 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1673 _min_heap_free_ratio = MinHeapFreeRatio; 1674 } 1675 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1676 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1677 _max_heap_free_ratio = MaxHeapFreeRatio; 1678 } 1679 } 1680 1681 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1682 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1683 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1684 // See CR 6362902 for details. 1685 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1686 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1687 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1688 } 1689 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1690 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1691 } 1692 } 1693 1694 if (UseParallelOldGC) { 1695 // Par compact uses lower default values since they are treated as 1696 // minimums. These are different defaults because of the different 1697 // interpretation and are not ergonomically set. 1698 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1699 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1700 } 1701 } 1702 } 1703 1704 void Arguments::set_g1_gc_flags() { 1705 assert(UseG1GC, "Error"); 1706 #ifdef COMPILER1 1707 FastTLABRefill = false; 1708 #endif 1709 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1710 if (ParallelGCThreads == 0) { 1711 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1712 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1713 } 1714 1715 #if INCLUDE_ALL_GCS 1716 if (G1ConcRefinementThreads == 0) { 1717 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads); 1718 } 1719 #endif 1720 1721 // MarkStackSize will be set (if it hasn't been set by the user) 1722 // when concurrent marking is initialized. 1723 // Its value will be based upon the number of parallel marking threads. 1724 // But we do set the maximum mark stack size here. 1725 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1726 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1727 } 1728 1729 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1730 // In G1, we want the default GC overhead goal to be higher than 1731 // say in PS. So we set it here to 10%. Otherwise the heap might 1732 // be expanded more aggressively than we would like it to. In 1733 // fact, even 10% seems to not be high enough in some cases 1734 // (especially small GC stress tests that the main thing they do 1735 // is allocation). We might consider increase it further. 1736 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1737 } 1738 1739 if (PrintGCDetails && Verbose) { 1740 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1741 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1742 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1743 } 1744 } 1745 1746 #if !INCLUDE_ALL_GCS 1747 #ifdef ASSERT 1748 static bool verify_serial_gc_flags() { 1749 return (UseSerialGC && 1750 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC || 1751 UseParallelGC || UseParallelOldGC)); 1752 } 1753 #endif // ASSERT 1754 #endif // INCLUDE_ALL_GCS 1755 1756 void Arguments::set_gc_specific_flags() { 1757 #if INCLUDE_ALL_GCS 1758 // Set per-collector flags 1759 if (UseParallelGC || UseParallelOldGC) { 1760 set_parallel_gc_flags(); 1761 } else if (UseConcMarkSweepGC) { 1762 set_cms_and_parnew_gc_flags(); 1763 } else if (UseG1GC) { 1764 set_g1_gc_flags(); 1765 } 1766 check_deprecated_gc_flags(); 1767 if (AssumeMP && !UseSerialGC) { 1768 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 1769 warning("If the number of processors is expected to increase from one, then" 1770 " you should configure the number of parallel GC threads appropriately" 1771 " using -XX:ParallelGCThreads=N"); 1772 } 1773 } 1774 if (MinHeapFreeRatio == 100) { 1775 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1776 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 1777 } 1778 #else // INCLUDE_ALL_GCS 1779 assert(verify_serial_gc_flags(), "SerialGC unset"); 1780 #endif // INCLUDE_ALL_GCS 1781 } 1782 1783 julong Arguments::limit_by_allocatable_memory(julong limit) { 1784 julong max_allocatable; 1785 julong result = limit; 1786 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1787 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1788 } 1789 return result; 1790 } 1791 1792 // Use static initialization to get the default before parsing 1793 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1794 1795 void Arguments::set_heap_size() { 1796 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1797 // Deprecated flag 1798 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1799 } 1800 1801 const julong phys_mem = 1802 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1803 : (julong)MaxRAM; 1804 1805 // If the maximum heap size has not been set with -Xmx, 1806 // then set it as fraction of the size of physical memory, 1807 // respecting the maximum and minimum sizes of the heap. 1808 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1809 julong reasonable_max = phys_mem / MaxRAMFraction; 1810 1811 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1812 // Small physical memory, so use a minimum fraction of it for the heap 1813 reasonable_max = phys_mem / MinRAMFraction; 1814 } else { 1815 // Not-small physical memory, so require a heap at least 1816 // as large as MaxHeapSize 1817 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1818 } 1819 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1820 // Limit the heap size to ErgoHeapSizeLimit 1821 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1822 } 1823 if (UseCompressedOops) { 1824 // Limit the heap size to the maximum possible when using compressed oops 1825 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1826 1827 // HeapBaseMinAddress can be greater than default but not less than. 1828 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1829 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1830 // matches compressed oops printing flags 1831 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 1832 jio_fprintf(defaultStream::error_stream(), 1833 "HeapBaseMinAddress must be at least " UINTX_FORMAT 1834 " (" UINTX_FORMAT "G) which is greater than value given " 1835 UINTX_FORMAT "\n", 1836 DefaultHeapBaseMinAddress, 1837 DefaultHeapBaseMinAddress/G, 1838 HeapBaseMinAddress); 1839 } 1840 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1841 } 1842 } 1843 1844 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1845 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1846 // but it should be not less than default MaxHeapSize. 1847 max_coop_heap -= HeapBaseMinAddress; 1848 } 1849 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1850 } 1851 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1852 1853 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1854 // An initial heap size was specified on the command line, 1855 // so be sure that the maximum size is consistent. Done 1856 // after call to limit_by_allocatable_memory because that 1857 // method might reduce the allocation size. 1858 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1859 } 1860 1861 if (PrintGCDetails && Verbose) { 1862 // Cannot use gclog_or_tty yet. 1863 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1864 } 1865 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1866 } 1867 1868 // If the minimum or initial heap_size have not been set or requested to be set 1869 // ergonomically, set them accordingly. 1870 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1871 julong reasonable_minimum = (julong)(OldSize + NewSize); 1872 1873 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1874 1875 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1876 1877 if (InitialHeapSize == 0) { 1878 julong reasonable_initial = phys_mem / InitialRAMFraction; 1879 1880 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1881 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1882 1883 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1884 1885 if (PrintGCDetails && Verbose) { 1886 // Cannot use gclog_or_tty yet. 1887 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1888 } 1889 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1890 } 1891 // If the minimum heap size has not been set (via -Xms), 1892 // synchronize with InitialHeapSize to avoid errors with the default value. 1893 if (min_heap_size() == 0) { 1894 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1895 if (PrintGCDetails && Verbose) { 1896 // Cannot use gclog_or_tty yet. 1897 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1898 } 1899 } 1900 } 1901 } 1902 1903 // This must be called after ergonomics. 1904 void Arguments::set_bytecode_flags() { 1905 if (!RewriteBytecodes) { 1906 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1907 } 1908 } 1909 1910 // Aggressive optimization flags -XX:+AggressiveOpts 1911 void Arguments::set_aggressive_opts_flags() { 1912 #ifdef COMPILER2 1913 if (AggressiveUnboxing) { 1914 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1915 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1916 } else if (!EliminateAutoBox) { 1917 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1918 AggressiveUnboxing = false; 1919 } 1920 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1921 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1922 } else if (!DoEscapeAnalysis) { 1923 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1924 AggressiveUnboxing = false; 1925 } 1926 } 1927 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1928 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1929 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1930 } 1931 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1932 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1933 } 1934 1935 // Feed the cache size setting into the JDK 1936 char buffer[1024]; 1937 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1938 add_property(buffer); 1939 } 1940 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1941 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1942 } 1943 #endif 1944 1945 if (AggressiveOpts) { 1946 // Sample flag setting code 1947 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1948 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1949 // } 1950 } 1951 } 1952 1953 //=========================================================================================================== 1954 // Parsing of java.compiler property 1955 1956 void Arguments::process_java_compiler_argument(char* arg) { 1957 // For backwards compatibility, Djava.compiler=NONE or "" 1958 // causes us to switch to -Xint mode UNLESS -Xdebug 1959 // is also specified. 1960 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1961 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1962 } 1963 } 1964 1965 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1966 _sun_java_launcher = os::strdup_check_oom(launcher); 1967 } 1968 1969 bool Arguments::created_by_java_launcher() { 1970 assert(_sun_java_launcher != NULL, "property must have value"); 1971 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1972 } 1973 1974 bool Arguments::sun_java_launcher_is_altjvm() { 1975 return _sun_java_launcher_is_altjvm; 1976 } 1977 1978 //=========================================================================================================== 1979 // Parsing of main arguments 1980 1981 bool Arguments::verify_interval(uintx val, uintx min, 1982 uintx max, const char* name) { 1983 // Returns true iff value is in the inclusive interval [min..max] 1984 // false, otherwise. 1985 if (val >= min && val <= max) { 1986 return true; 1987 } 1988 jio_fprintf(defaultStream::error_stream(), 1989 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1990 " and " UINTX_FORMAT "\n", 1991 name, val, min, max); 1992 return false; 1993 } 1994 1995 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1996 // Returns true if given value is at least specified min threshold 1997 // false, otherwise. 1998 if (val >= min ) { 1999 return true; 2000 } 2001 jio_fprintf(defaultStream::error_stream(), 2002 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 2003 name, val, min); 2004 return false; 2005 } 2006 2007 bool Arguments::verify_percentage(uintx value, const char* name) { 2008 if (is_percentage(value)) { 2009 return true; 2010 } 2011 jio_fprintf(defaultStream::error_stream(), 2012 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 2013 name, value); 2014 return false; 2015 } 2016 2017 // check if do gclog rotation 2018 // +UseGCLogFileRotation is a must, 2019 // no gc log rotation when log file not supplied or 2020 // NumberOfGCLogFiles is 0 2021 void check_gclog_consistency() { 2022 if (UseGCLogFileRotation) { 2023 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { 2024 jio_fprintf(defaultStream::output_stream(), 2025 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" 2026 "where num_of_file > 0\n" 2027 "GC log rotation is turned off\n"); 2028 UseGCLogFileRotation = false; 2029 } 2030 } 2031 2032 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { 2033 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 2034 jio_fprintf(defaultStream::output_stream(), 2035 "GCLogFileSize changed to minimum 8K\n"); 2036 } 2037 } 2038 2039 // This function is called for -Xloggc:<filename>, it can be used 2040 // to check if a given file name(or string) conforms to the following 2041 // specification: 2042 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 2043 // %p and %t only allowed once. We only limit usage of filename not path 2044 bool is_filename_valid(const char *file_name) { 2045 const char* p = file_name; 2046 char file_sep = os::file_separator()[0]; 2047 const char* cp; 2048 // skip prefix path 2049 for (cp = file_name; *cp != '\0'; cp++) { 2050 if (*cp == '/' || *cp == file_sep) { 2051 p = cp + 1; 2052 } 2053 } 2054 2055 int count_p = 0; 2056 int count_t = 0; 2057 while (*p != '\0') { 2058 if ((*p >= '0' && *p <= '9') || 2059 (*p >= 'A' && *p <= 'Z') || 2060 (*p >= 'a' && *p <= 'z') || 2061 *p == '-' || 2062 *p == '_' || 2063 *p == '.') { 2064 p++; 2065 continue; 2066 } 2067 if (*p == '%') { 2068 if(*(p + 1) == 'p') { 2069 p += 2; 2070 count_p ++; 2071 continue; 2072 } 2073 if (*(p + 1) == 't') { 2074 p += 2; 2075 count_t ++; 2076 continue; 2077 } 2078 } 2079 return false; 2080 } 2081 return count_p < 2 && count_t < 2; 2082 } 2083 2084 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) { 2085 if (!is_percentage(min_heap_free_ratio)) { 2086 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100"); 2087 return false; 2088 } 2089 if (min_heap_free_ratio > MaxHeapFreeRatio) { 2090 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 2091 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio, 2092 MaxHeapFreeRatio); 2093 return false; 2094 } 2095 // This does not set the flag itself, but stores the value in a safe place for later usage. 2096 _min_heap_free_ratio = min_heap_free_ratio; 2097 return true; 2098 } 2099 2100 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) { 2101 if (!is_percentage(max_heap_free_ratio)) { 2102 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100"); 2103 return false; 2104 } 2105 if (max_heap_free_ratio < MinHeapFreeRatio) { 2106 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or " 2107 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio, 2108 MinHeapFreeRatio); 2109 return false; 2110 } 2111 // This does not set the flag itself, but stores the value in a safe place for later usage. 2112 _max_heap_free_ratio = max_heap_free_ratio; 2113 return true; 2114 } 2115 2116 // Check consistency of GC selection 2117 bool Arguments::check_gc_consistency_user() { 2118 check_gclog_consistency(); 2119 // Ensure that the user has not selected conflicting sets 2120 // of collectors. 2121 uint i = 0; 2122 if (UseSerialGC) i++; 2123 if (UseConcMarkSweepGC) i++; 2124 if (UseParallelGC || UseParallelOldGC) i++; 2125 if (UseG1GC) i++; 2126 if (i > 1) { 2127 jio_fprintf(defaultStream::error_stream(), 2128 "Conflicting collector combinations in option list; " 2129 "please refer to the release notes for the combinations " 2130 "allowed\n"); 2131 return false; 2132 } 2133 2134 if (UseConcMarkSweepGC && !UseParNewGC) { 2135 jio_fprintf(defaultStream::error_stream(), 2136 "It is not possible to combine the DefNew young collector with the CMS collector.\n"); 2137 return false; 2138 } 2139 2140 if (UseParNewGC && !UseConcMarkSweepGC) { 2141 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 2142 // set up UseSerialGC properly, so that can't be used in the check here. 2143 jio_fprintf(defaultStream::error_stream(), 2144 "It is not possible to combine the ParNew young collector with the Serial old collector.\n"); 2145 return false; 2146 } 2147 2148 return true; 2149 } 2150 2151 void Arguments::check_deprecated_gc_flags() { 2152 if (FLAG_IS_CMDLINE(UseParNewGC)) { 2153 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release"); 2154 } 2155 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 2156 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 2157 "and will likely be removed in future release"); 2158 } 2159 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 2160 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 2161 "Use MaxRAMFraction instead."); 2162 } 2163 } 2164 2165 // Check stack pages settings 2166 bool Arguments::check_stack_pages() 2167 { 2168 bool status = true; 2169 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 2170 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 2171 // greater stack shadow pages can't generate instruction to bang stack 2172 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 2173 return status; 2174 } 2175 2176 // Check the consistency of vm_init_args 2177 bool Arguments::check_vm_args_consistency() { 2178 // Method for adding checks for flag consistency. 2179 // The intent is to warn the user of all possible conflicts, 2180 // before returning an error. 2181 // Note: Needs platform-dependent factoring. 2182 bool status = true; 2183 2184 if (TLABRefillWasteFraction == 0) { 2185 jio_fprintf(defaultStream::error_stream(), 2186 "TLABRefillWasteFraction should be a denominator, " 2187 "not " SIZE_FORMAT "\n", 2188 TLABRefillWasteFraction); 2189 status = false; 2190 } 2191 2192 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 2193 "AdaptiveSizePolicyWeight"); 2194 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 2195 2196 // Divide by bucket size to prevent a large size from causing rollover when 2197 // calculating amount of memory needed to be allocated for the String table. 2198 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2199 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2200 2201 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize, 2202 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size"); 2203 2204 { 2205 // Using "else if" below to avoid printing two error messages if min > max. 2206 // This will also prevent us from reporting both min>100 and max>100 at the 2207 // same time, but that is less annoying than printing two identical errors IMHO. 2208 FormatBuffer<80> err_msg("%s",""); 2209 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) { 2210 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2211 status = false; 2212 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) { 2213 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2214 status = false; 2215 } 2216 } 2217 2218 // Min/MaxMetaspaceFreeRatio 2219 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2220 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2221 2222 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2223 jio_fprintf(defaultStream::error_stream(), 2224 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2225 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2226 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2227 MinMetaspaceFreeRatio, 2228 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2229 MaxMetaspaceFreeRatio); 2230 status = false; 2231 } 2232 2233 // Trying to keep 100% free is not practical 2234 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2235 2236 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2237 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2238 } 2239 2240 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2241 // Settings to encourage splitting. 2242 if (!FLAG_IS_CMDLINE(NewRatio)) { 2243 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2244 } 2245 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2246 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2247 } 2248 } 2249 2250 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2251 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2252 } 2253 2254 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2255 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2256 if (GCTimeLimit == 100) { 2257 // Turn off gc-overhead-limit-exceeded checks 2258 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2259 } 2260 2261 status = status && check_gc_consistency_user(); 2262 status = status && check_stack_pages(); 2263 2264 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2265 "CMSIncrementalSafetyFactor"); 2266 2267 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2268 // insists that we hold the requisite locks so that the iteration is 2269 // MT-safe. For the verification at start-up and shut-down, we don't 2270 // yet have a good way of acquiring and releasing these locks, 2271 // which are not visible at the CollectedHeap level. We want to 2272 // be able to acquire these locks and then do the iteration rather 2273 // than just disable the lock verification. This will be fixed under 2274 // bug 4788986. 2275 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2276 if (VerifyDuringStartup) { 2277 warning("Heap verification at start-up disabled " 2278 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2279 VerifyDuringStartup = false; // Disable verification at start-up 2280 } 2281 2282 if (VerifyBeforeExit) { 2283 warning("Heap verification at shutdown disabled " 2284 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2285 VerifyBeforeExit = false; // Disable verification at shutdown 2286 } 2287 } 2288 2289 // Note: only executed in non-PRODUCT mode 2290 if (!UseAsyncConcMarkSweepGC && 2291 (ExplicitGCInvokesConcurrent || 2292 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2293 jio_fprintf(defaultStream::error_stream(), 2294 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2295 " with -UseAsyncConcMarkSweepGC"); 2296 status = false; 2297 } 2298 2299 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2300 2301 #if INCLUDE_ALL_GCS 2302 if (UseG1GC) { 2303 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent"); 2304 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent"); 2305 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent"); 2306 2307 status = status && verify_percentage(G1ConfidencePercent, "G1ConfidencePercent"); 2308 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2309 "InitiatingHeapOccupancyPercent"); 2310 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2311 "G1RefProcDrainInterval"); 2312 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2313 "G1ConcMarkStepDurationMillis"); 2314 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2315 "G1ConcRSHotCardLimit"); 2316 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2317 "G1ConcRSLogCacheSize"); 2318 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age, 2319 "StringDeduplicationAgeThreshold"); 2320 } 2321 if (UseConcMarkSweepGC) { 2322 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2323 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2324 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2325 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2326 2327 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2328 2329 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2330 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2331 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2332 2333 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2334 2335 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2336 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2337 2338 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2339 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2340 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2341 2342 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2343 2344 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2345 2346 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2347 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2348 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2349 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2350 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2351 } 2352 2353 if (UseParallelGC || UseParallelOldGC) { 2354 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2355 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2356 2357 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2358 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2359 2360 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2361 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2362 2363 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2364 2365 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2366 } 2367 #endif // INCLUDE_ALL_GCS 2368 2369 status = status && verify_interval(RefDiscoveryPolicy, 2370 ReferenceProcessor::DiscoveryPolicyMin, 2371 ReferenceProcessor::DiscoveryPolicyMax, 2372 "RefDiscoveryPolicy"); 2373 2374 // Limit the lower bound of this flag to 1 as it is used in a division 2375 // expression. 2376 status = status && verify_interval(TLABWasteTargetPercent, 2377 1, 100, "TLABWasteTargetPercent"); 2378 2379 status = status && verify_object_alignment(); 2380 2381 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2382 "CompressedClassSpaceSize"); 2383 2384 status = status && verify_interval(MarkStackSizeMax, 2385 1, (max_jint - 1), "MarkStackSizeMax"); 2386 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2387 2388 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2389 2390 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2391 2392 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2393 2394 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2395 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2396 2397 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2398 2399 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2400 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2401 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2402 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2403 2404 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2405 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2406 2407 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2408 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2409 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2410 2411 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2412 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2413 2414 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold"); 2415 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold"); 2416 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2417 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2418 2419 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2420 #ifdef COMPILER1 2421 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize"); 2422 #endif 2423 status = status && verify_min_value(HeapSearchSteps, 1, "HeapSearchSteps"); 2424 2425 if (PrintNMTStatistics) { 2426 #if INCLUDE_NMT 2427 if (MemTracker::tracking_level() == NMT_off) { 2428 #endif // INCLUDE_NMT 2429 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2430 PrintNMTStatistics = false; 2431 #if INCLUDE_NMT 2432 } 2433 #endif 2434 } 2435 2436 // Need to limit the extent of the padding to reasonable size. 2437 // 8K is well beyond the reasonable HW cache line size, even with the 2438 // aggressive prefetching, while still leaving the room for segregating 2439 // among the distinct pages. 2440 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2441 jio_fprintf(defaultStream::error_stream(), 2442 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2443 ContendedPaddingWidth, 0, 8192); 2444 status = false; 2445 } 2446 2447 // Need to enforce the padding not to break the existing field alignments. 2448 // It is sufficient to check against the largest type size. 2449 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2450 jio_fprintf(defaultStream::error_stream(), 2451 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2452 ContendedPaddingWidth, BytesPerLong); 2453 status = false; 2454 } 2455 2456 // Check lower bounds of the code cache 2457 // Template Interpreter code is approximately 3X larger in debug builds. 2458 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2459 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2460 jio_fprintf(defaultStream::error_stream(), 2461 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2462 os::vm_page_size()/K); 2463 status = false; 2464 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2465 jio_fprintf(defaultStream::error_stream(), 2466 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2467 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2468 status = false; 2469 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2470 jio_fprintf(defaultStream::error_stream(), 2471 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2472 min_code_cache_size/K); 2473 status = false; 2474 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2475 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2476 jio_fprintf(defaultStream::error_stream(), 2477 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2478 CODE_CACHE_SIZE_LIMIT/M); 2479 status = false; 2480 } else if (NonNMethodCodeHeapSize < min_code_cache_size){ 2481 jio_fprintf(defaultStream::error_stream(), 2482 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2483 min_code_cache_size/K); 2484 status = false; 2485 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) 2486 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 2487 jio_fprintf(defaultStream::error_stream(), 2488 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 2489 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 2490 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 2491 status = false; 2492 } 2493 2494 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); 2495 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength"); 2496 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize"); 2497 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt"); 2498 2499 2500 int min_number_of_compiler_threads = get_min_number_of_compiler_threads(); 2501 // The default CICompilerCount's value is CI_COMPILER_COUNT. 2502 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number"); 2503 // Check the minimum number of compiler threads 2504 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount"); 2505 2506 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2507 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2508 } 2509 2510 return status; 2511 } 2512 2513 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2514 const char* option_type) { 2515 if (ignore) return false; 2516 2517 const char* spacer = " "; 2518 if (option_type == NULL) { 2519 option_type = ++spacer; // Set both to the empty string. 2520 } 2521 2522 if (os::obsolete_option(option)) { 2523 jio_fprintf(defaultStream::error_stream(), 2524 "Obsolete %s%soption: %s\n", option_type, spacer, 2525 option->optionString); 2526 return false; 2527 } else { 2528 jio_fprintf(defaultStream::error_stream(), 2529 "Unrecognized %s%soption: %s\n", option_type, spacer, 2530 option->optionString); 2531 return true; 2532 } 2533 } 2534 2535 static const char* user_assertion_options[] = { 2536 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2537 }; 2538 2539 static const char* system_assertion_options[] = { 2540 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2541 }; 2542 2543 bool Arguments::parse_uintx(const char* value, 2544 uintx* uintx_arg, 2545 uintx min_size) { 2546 2547 // Check the sign first since atomull() parses only unsigned values. 2548 bool value_is_positive = !(*value == '-'); 2549 2550 if (value_is_positive) { 2551 julong n; 2552 bool good_return = atomull(value, &n); 2553 if (good_return) { 2554 bool above_minimum = n >= min_size; 2555 bool value_is_too_large = n > max_uintx; 2556 2557 if (above_minimum && !value_is_too_large) { 2558 *uintx_arg = n; 2559 return true; 2560 } 2561 } 2562 } 2563 return false; 2564 } 2565 2566 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2567 julong* long_arg, 2568 julong min_size) { 2569 if (!atomull(s, long_arg)) return arg_unreadable; 2570 return check_memory_size(*long_arg, min_size); 2571 } 2572 2573 // Parse JavaVMInitArgs structure 2574 2575 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2576 // For components of the system classpath. 2577 SysClassPath scp(Arguments::get_sysclasspath()); 2578 bool scp_assembly_required = false; 2579 2580 // Save default settings for some mode flags 2581 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2582 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2583 Arguments::_ClipInlining = ClipInlining; 2584 Arguments::_BackgroundCompilation = BackgroundCompilation; 2585 2586 // Setup flags for mixed which is the default 2587 set_mode_flags(_mixed); 2588 2589 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2590 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2591 if (result != JNI_OK) { 2592 return result; 2593 } 2594 2595 // Parse JavaVMInitArgs structure passed in 2596 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE); 2597 if (result != JNI_OK) { 2598 return result; 2599 } 2600 2601 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2602 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2603 if (result != JNI_OK) { 2604 return result; 2605 } 2606 2607 // Do final processing now that all arguments have been parsed 2608 result = finalize_vm_init_args(&scp, scp_assembly_required); 2609 if (result != JNI_OK) { 2610 return result; 2611 } 2612 2613 return JNI_OK; 2614 } 2615 2616 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2617 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2618 // are dealing with -agentpath (case where name is a path), otherwise with 2619 // -agentlib 2620 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2621 char *_name; 2622 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2623 size_t _len_hprof, _len_jdwp, _len_prefix; 2624 2625 if (is_path) { 2626 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2627 return false; 2628 } 2629 2630 _name++; // skip past last path separator 2631 _len_prefix = strlen(JNI_LIB_PREFIX); 2632 2633 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2634 return false; 2635 } 2636 2637 _name += _len_prefix; 2638 _len_hprof = strlen(_hprof); 2639 _len_jdwp = strlen(_jdwp); 2640 2641 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2642 _name += _len_hprof; 2643 } 2644 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2645 _name += _len_jdwp; 2646 } 2647 else { 2648 return false; 2649 } 2650 2651 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2652 return false; 2653 } 2654 2655 return true; 2656 } 2657 2658 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2659 return true; 2660 } 2661 2662 return false; 2663 } 2664 2665 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2666 SysClassPath* scp_p, 2667 bool* scp_assembly_required_p, 2668 Flag::Flags origin) { 2669 // Remaining part of option string 2670 const char* tail; 2671 2672 // iterate over arguments 2673 for (int index = 0; index < args->nOptions; index++) { 2674 bool is_absolute_path = false; // for -agentpath vs -agentlib 2675 2676 const JavaVMOption* option = args->options + index; 2677 2678 if (!match_option(option, "-Djava.class.path", &tail) && 2679 !match_option(option, "-Dsun.java.command", &tail) && 2680 !match_option(option, "-Dsun.java.launcher", &tail)) { 2681 2682 // add all jvm options to the jvm_args string. This string 2683 // is used later to set the java.vm.args PerfData string constant. 2684 // the -Djava.class.path and the -Dsun.java.command options are 2685 // omitted from jvm_args string as each have their own PerfData 2686 // string constant object. 2687 build_jvm_args(option->optionString); 2688 } 2689 2690 // -verbose:[class/gc/jni] 2691 if (match_option(option, "-verbose", &tail)) { 2692 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2693 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2694 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2695 } else if (!strcmp(tail, ":gc")) { 2696 FLAG_SET_CMDLINE(bool, PrintGC, true); 2697 } else if (!strcmp(tail, ":jni")) { 2698 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2699 } 2700 // -da / -ea / -disableassertions / -enableassertions 2701 // These accept an optional class/package name separated by a colon, e.g., 2702 // -da:java.lang.Thread. 2703 } else if (match_option(option, user_assertion_options, &tail, true)) { 2704 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2705 if (*tail == '\0') { 2706 JavaAssertions::setUserClassDefault(enable); 2707 } else { 2708 assert(*tail == ':', "bogus match by match_option()"); 2709 JavaAssertions::addOption(tail + 1, enable); 2710 } 2711 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2712 } else if (match_option(option, system_assertion_options, &tail, false)) { 2713 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2714 JavaAssertions::setSystemClassDefault(enable); 2715 // -bootclasspath: 2716 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2717 scp_p->reset_path(tail); 2718 *scp_assembly_required_p = true; 2719 // -bootclasspath/a: 2720 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2721 scp_p->add_suffix(tail); 2722 *scp_assembly_required_p = true; 2723 // -bootclasspath/p: 2724 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2725 scp_p->add_prefix(tail); 2726 *scp_assembly_required_p = true; 2727 // -Xrun 2728 } else if (match_option(option, "-Xrun", &tail)) { 2729 if (tail != NULL) { 2730 const char* pos = strchr(tail, ':'); 2731 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2732 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2733 name[len] = '\0'; 2734 2735 char *options = NULL; 2736 if(pos != NULL) { 2737 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2738 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2739 } 2740 #if !INCLUDE_JVMTI 2741 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2742 jio_fprintf(defaultStream::error_stream(), 2743 "Profiling and debugging agents are not supported in this VM\n"); 2744 return JNI_ERR; 2745 } 2746 #endif // !INCLUDE_JVMTI 2747 add_init_library(name, options); 2748 } 2749 // -agentlib and -agentpath 2750 } else if (match_option(option, "-agentlib:", &tail) || 2751 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2752 if(tail != NULL) { 2753 const char* pos = strchr(tail, '='); 2754 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2755 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2756 name[len] = '\0'; 2757 2758 char *options = NULL; 2759 if(pos != NULL) { 2760 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2761 } 2762 #if !INCLUDE_JVMTI 2763 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2764 jio_fprintf(defaultStream::error_stream(), 2765 "Profiling and debugging agents are not supported in this VM\n"); 2766 return JNI_ERR; 2767 } 2768 #endif // !INCLUDE_JVMTI 2769 add_init_agent(name, options, is_absolute_path); 2770 } 2771 // -javaagent 2772 } else if (match_option(option, "-javaagent:", &tail)) { 2773 #if !INCLUDE_JVMTI 2774 jio_fprintf(defaultStream::error_stream(), 2775 "Instrumentation agents are not supported in this VM\n"); 2776 return JNI_ERR; 2777 #else 2778 if(tail != NULL) { 2779 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2780 add_init_agent("instrument", options, false); 2781 } 2782 #endif // !INCLUDE_JVMTI 2783 // -Xnoclassgc 2784 } else if (match_option(option, "-Xnoclassgc")) { 2785 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2786 // -Xconcgc 2787 } else if (match_option(option, "-Xconcgc")) { 2788 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2789 // -Xnoconcgc 2790 } else if (match_option(option, "-Xnoconcgc")) { 2791 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2792 // -Xbatch 2793 } else if (match_option(option, "-Xbatch")) { 2794 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2795 // -Xmn for compatibility with other JVM vendors 2796 } else if (match_option(option, "-Xmn", &tail)) { 2797 julong long_initial_young_size = 0; 2798 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2799 if (errcode != arg_in_range) { 2800 jio_fprintf(defaultStream::error_stream(), 2801 "Invalid initial young generation size: %s\n", option->optionString); 2802 describe_range_error(errcode); 2803 return JNI_EINVAL; 2804 } 2805 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size); 2806 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size); 2807 // -Xms 2808 } else if (match_option(option, "-Xms", &tail)) { 2809 julong long_initial_heap_size = 0; 2810 // an initial heap size of 0 means automatically determine 2811 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2812 if (errcode != arg_in_range) { 2813 jio_fprintf(defaultStream::error_stream(), 2814 "Invalid initial heap size: %s\n", option->optionString); 2815 describe_range_error(errcode); 2816 return JNI_EINVAL; 2817 } 2818 set_min_heap_size((uintx)long_initial_heap_size); 2819 // Currently the minimum size and the initial heap sizes are the same. 2820 // Can be overridden with -XX:InitialHeapSize. 2821 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2822 // -Xmx 2823 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2824 julong long_max_heap_size = 0; 2825 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2826 if (errcode != arg_in_range) { 2827 jio_fprintf(defaultStream::error_stream(), 2828 "Invalid maximum heap size: %s\n", option->optionString); 2829 describe_range_error(errcode); 2830 return JNI_EINVAL; 2831 } 2832 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2833 // Xmaxf 2834 } else if (match_option(option, "-Xmaxf", &tail)) { 2835 char* err; 2836 int maxf = (int)(strtod(tail, &err) * 100); 2837 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) { 2838 jio_fprintf(defaultStream::error_stream(), 2839 "Bad max heap free percentage size: %s\n", 2840 option->optionString); 2841 return JNI_EINVAL; 2842 } else { 2843 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2844 } 2845 // Xminf 2846 } else if (match_option(option, "-Xminf", &tail)) { 2847 char* err; 2848 int minf = (int)(strtod(tail, &err) * 100); 2849 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) { 2850 jio_fprintf(defaultStream::error_stream(), 2851 "Bad min heap free percentage size: %s\n", 2852 option->optionString); 2853 return JNI_EINVAL; 2854 } else { 2855 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2856 } 2857 // -Xss 2858 } else if (match_option(option, "-Xss", &tail)) { 2859 julong long_ThreadStackSize = 0; 2860 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2861 if (errcode != arg_in_range) { 2862 jio_fprintf(defaultStream::error_stream(), 2863 "Invalid thread stack size: %s\n", option->optionString); 2864 describe_range_error(errcode); 2865 return JNI_EINVAL; 2866 } 2867 // Internally track ThreadStackSize in units of 1024 bytes. 2868 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2869 round_to((int)long_ThreadStackSize, K) / K); 2870 // -Xoss 2871 } else if (match_option(option, "-Xoss", &tail)) { 2872 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2873 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2874 julong long_CodeCacheExpansionSize = 0; 2875 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2876 if (errcode != arg_in_range) { 2877 jio_fprintf(defaultStream::error_stream(), 2878 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2879 os::vm_page_size()/K); 2880 return JNI_EINVAL; 2881 } 2882 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2883 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2884 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2885 julong long_ReservedCodeCacheSize = 0; 2886 2887 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2888 if (errcode != arg_in_range) { 2889 jio_fprintf(defaultStream::error_stream(), 2890 "Invalid maximum code cache size: %s.\n", option->optionString); 2891 return JNI_EINVAL; 2892 } 2893 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2894 // -XX:NonNMethodCodeHeapSize= 2895 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 2896 julong long_NonNMethodCodeHeapSize = 0; 2897 2898 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 2899 if (errcode != arg_in_range) { 2900 jio_fprintf(defaultStream::error_stream(), 2901 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 2902 return JNI_EINVAL; 2903 } 2904 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize); 2905 // -XX:ProfiledCodeHeapSize= 2906 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 2907 julong long_ProfiledCodeHeapSize = 0; 2908 2909 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 2910 if (errcode != arg_in_range) { 2911 jio_fprintf(defaultStream::error_stream(), 2912 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 2913 return JNI_EINVAL; 2914 } 2915 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize); 2916 // -XX:NonProfiledCodeHeapSizee= 2917 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 2918 julong long_NonProfiledCodeHeapSize = 0; 2919 2920 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 2921 if (errcode != arg_in_range) { 2922 jio_fprintf(defaultStream::error_stream(), 2923 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 2924 return JNI_EINVAL; 2925 } 2926 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize); 2927 //-XX:IncreaseFirstTierCompileThresholdAt= 2928 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2929 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2930 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2931 jio_fprintf(defaultStream::error_stream(), 2932 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2933 option->optionString); 2934 return JNI_EINVAL; 2935 } 2936 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2937 // -green 2938 } else if (match_option(option, "-green")) { 2939 jio_fprintf(defaultStream::error_stream(), 2940 "Green threads support not available\n"); 2941 return JNI_EINVAL; 2942 // -native 2943 } else if (match_option(option, "-native")) { 2944 // HotSpot always uses native threads, ignore silently for compatibility 2945 // -Xsqnopause 2946 } else if (match_option(option, "-Xsqnopause")) { 2947 // EVM option, ignore silently for compatibility 2948 // -Xrs 2949 } else if (match_option(option, "-Xrs")) { 2950 // Classic/EVM option, new functionality 2951 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2952 } else if (match_option(option, "-Xusealtsigs")) { 2953 // change default internal VM signals used - lower case for back compat 2954 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2955 // -Xoptimize 2956 } else if (match_option(option, "-Xoptimize")) { 2957 // EVM option, ignore silently for compatibility 2958 // -Xprof 2959 } else if (match_option(option, "-Xprof")) { 2960 #if INCLUDE_FPROF 2961 _has_profile = true; 2962 #else // INCLUDE_FPROF 2963 jio_fprintf(defaultStream::error_stream(), 2964 "Flat profiling is not supported in this VM.\n"); 2965 return JNI_ERR; 2966 #endif // INCLUDE_FPROF 2967 // -Xconcurrentio 2968 } else if (match_option(option, "-Xconcurrentio")) { 2969 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2970 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2971 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2972 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2973 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2974 2975 // -Xinternalversion 2976 } else if (match_option(option, "-Xinternalversion")) { 2977 jio_fprintf(defaultStream::output_stream(), "%s\n", 2978 VM_Version::internal_vm_info_string()); 2979 vm_exit(0); 2980 #ifndef PRODUCT 2981 // -Xprintflags 2982 } else if (match_option(option, "-Xprintflags")) { 2983 CommandLineFlags::printFlags(tty, false); 2984 vm_exit(0); 2985 #endif 2986 // -D 2987 } else if (match_option(option, "-D", &tail)) { 2988 const char* value; 2989 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2990 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2991 // abort if -Djava.endorsed.dirs is set 2992 jio_fprintf(defaultStream::output_stream(), 2993 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2994 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2995 return JNI_EINVAL; 2996 } 2997 if (match_option(option, "-Djava.ext.dirs=", &value) && 2998 *value != '\0' && strcmp(value, "\"\"") != 0) { 2999 // abort if -Djava.ext.dirs is set 3000 jio_fprintf(defaultStream::output_stream(), 3001 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 3002 return JNI_EINVAL; 3003 } 3004 3005 if (!add_property(tail)) { 3006 return JNI_ENOMEM; 3007 } 3008 // Out of the box management support 3009 if (match_option(option, "-Dcom.sun.management", &tail)) { 3010 #if INCLUDE_MANAGEMENT 3011 FLAG_SET_CMDLINE(bool, ManagementServer, true); 3012 #else 3013 jio_fprintf(defaultStream::output_stream(), 3014 "-Dcom.sun.management is not supported in this VM.\n"); 3015 return JNI_ERR; 3016 #endif 3017 } 3018 // -Xint 3019 } else if (match_option(option, "-Xint")) { 3020 set_mode_flags(_int); 3021 // -Xmixed 3022 } else if (match_option(option, "-Xmixed")) { 3023 set_mode_flags(_mixed); 3024 // -Xcomp 3025 } else if (match_option(option, "-Xcomp")) { 3026 // for testing the compiler; turn off all flags that inhibit compilation 3027 set_mode_flags(_comp); 3028 // -Xshare:dump 3029 } else if (match_option(option, "-Xshare:dump")) { 3030 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 3031 set_mode_flags(_int); // Prevent compilation, which creates objects 3032 // -Xshare:on 3033 } else if (match_option(option, "-Xshare:on")) { 3034 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3035 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3036 // -Xshare:auto 3037 } else if (match_option(option, "-Xshare:auto")) { 3038 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3039 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3040 // -Xshare:off 3041 } else if (match_option(option, "-Xshare:off")) { 3042 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 3043 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3044 // -Xverify 3045 } else if (match_option(option, "-Xverify", &tail)) { 3046 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3047 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 3048 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3049 } else if (strcmp(tail, ":remote") == 0) { 3050 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3051 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3052 } else if (strcmp(tail, ":none") == 0) { 3053 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3054 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 3055 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3056 return JNI_EINVAL; 3057 } 3058 // -Xdebug 3059 } else if (match_option(option, "-Xdebug")) { 3060 // note this flag has been used, then ignore 3061 set_xdebug_mode(true); 3062 // -Xnoagent 3063 } else if (match_option(option, "-Xnoagent")) { 3064 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3065 } else if (match_option(option, "-Xboundthreads")) { 3066 // Bind user level threads to kernel threads (Solaris only) 3067 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 3068 } else if (match_option(option, "-Xloggc:", &tail)) { 3069 // Redirect GC output to the file. -Xloggc:<filename> 3070 // ostream_init_log(), when called will use this filename 3071 // to initialize a fileStream. 3072 _gc_log_filename = os::strdup_check_oom(tail); 3073 if (!is_filename_valid(_gc_log_filename)) { 3074 jio_fprintf(defaultStream::output_stream(), 3075 "Invalid file name for use with -Xloggc: Filename can only contain the " 3076 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 3077 "Note %%p or %%t can only be used once\n", _gc_log_filename); 3078 return JNI_EINVAL; 3079 } 3080 FLAG_SET_CMDLINE(bool, PrintGC, true); 3081 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 3082 3083 // JNI hooks 3084 } else if (match_option(option, "-Xcheck", &tail)) { 3085 if (!strcmp(tail, ":jni")) { 3086 #if !INCLUDE_JNI_CHECK 3087 warning("JNI CHECKING is not supported in this VM"); 3088 #else 3089 CheckJNICalls = true; 3090 #endif // INCLUDE_JNI_CHECK 3091 } else if (is_bad_option(option, args->ignoreUnrecognized, 3092 "check")) { 3093 return JNI_EINVAL; 3094 } 3095 } else if (match_option(option, "vfprintf")) { 3096 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3097 } else if (match_option(option, "exit")) { 3098 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3099 } else if (match_option(option, "abort")) { 3100 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3101 // -XX:+AggressiveHeap 3102 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3103 3104 // This option inspects the machine and attempts to set various 3105 // parameters to be optimal for long-running, memory allocation 3106 // intensive jobs. It is intended for machines with large 3107 // amounts of cpu and memory. 3108 3109 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 3110 // VM, but we may not be able to represent the total physical memory 3111 // available (like having 8gb of memory on a box but using a 32bit VM). 3112 // Thus, we need to make sure we're using a julong for intermediate 3113 // calculations. 3114 julong initHeapSize; 3115 julong total_memory = os::physical_memory(); 3116 3117 if (total_memory < (julong)256*M) { 3118 jio_fprintf(defaultStream::error_stream(), 3119 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 3120 vm_exit(1); 3121 } 3122 3123 // The heap size is half of available memory, or (at most) 3124 // all of possible memory less 160mb (leaving room for the OS 3125 // when using ISM). This is the maximum; because adaptive sizing 3126 // is turned on below, the actual space used may be smaller. 3127 3128 initHeapSize = MIN2(total_memory / (julong)2, 3129 total_memory - (julong)160*M); 3130 3131 initHeapSize = limit_by_allocatable_memory(initHeapSize); 3132 3133 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 3134 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 3135 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 3136 // Currently the minimum size and the initial heap sizes are the same. 3137 set_min_heap_size(initHeapSize); 3138 } 3139 if (FLAG_IS_DEFAULT(NewSize)) { 3140 // Make the young generation 3/8ths of the total heap. 3141 FLAG_SET_CMDLINE(uintx, NewSize, 3142 ((julong)MaxHeapSize / (julong)8) * (julong)3); 3143 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 3144 } 3145 3146 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3147 FLAG_SET_DEFAULT(UseLargePages, true); 3148 #endif 3149 3150 // Increase some data structure sizes for efficiency 3151 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 3152 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3153 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 3154 3155 // See the OldPLABSize comment below, but replace 'after promotion' 3156 // with 'after copying'. YoungPLABSize is the size of the survivor 3157 // space per-gc-thread buffers. The default is 4kw. 3158 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 3159 3160 // OldPLABSize is the size of the buffers in the old gen that 3161 // UseParallelGC uses to promote live data that doesn't fit in the 3162 // survivor spaces. At any given time, there's one for each gc thread. 3163 // The default size is 1kw. These buffers are rarely used, since the 3164 // survivor spaces are usually big enough. For specjbb, however, there 3165 // are occasions when there's lots of live data in the young gen 3166 // and we end up promoting some of it. We don't have a definite 3167 // explanation for why bumping OldPLABSize helps, but the theory 3168 // is that a bigger PLAB results in retaining something like the 3169 // original allocation order after promotion, which improves mutator 3170 // locality. A minor effect may be that larger PLABs reduce the 3171 // number of PLAB allocation events during gc. The value of 8kw 3172 // was arrived at by experimenting with specjbb. 3173 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 3174 3175 // Enable parallel GC and adaptive generation sizing 3176 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 3177 FLAG_SET_DEFAULT(ParallelGCThreads, 3178 Abstract_VM_Version::parallel_worker_threads()); 3179 3180 // Encourage steady state memory management 3181 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 3182 3183 // This appears to improve mutator locality 3184 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3185 3186 // Get around early Solaris scheduling bug 3187 // (affinity vs other jobs on system) 3188 // but disallow DR and offlining (5008695). 3189 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 3190 3191 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3192 // and the last option wins. 3193 } else if (match_option(option, "-XX:+NeverTenure")) { 3194 FLAG_SET_CMDLINE(bool, NeverTenure, true); 3195 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3196 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1); 3197 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3198 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3199 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3200 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 3201 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3202 uintx max_tenuring_thresh = 0; 3203 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3204 jio_fprintf(defaultStream::error_stream(), 3205 "Invalid MaxTenuringThreshold: %s\n", option->optionString); 3206 } 3207 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh); 3208 3209 if (MaxTenuringThreshold == 0) { 3210 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3211 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3212 } else { 3213 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3214 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3215 } 3216 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3217 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3218 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3219 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3220 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3221 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3222 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3223 #if defined(DTRACE_ENABLED) 3224 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3225 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3226 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3227 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3228 #else // defined(DTRACE_ENABLED) 3229 jio_fprintf(defaultStream::error_stream(), 3230 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3231 return JNI_EINVAL; 3232 #endif // defined(DTRACE_ENABLED) 3233 #ifdef ASSERT 3234 } else if (match_option(option, "-XX:+FullGCALot")) { 3235 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3236 // disable scavenge before parallel mark-compact 3237 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3238 #endif 3239 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3240 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3241 julong stack_size = 0; 3242 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3243 if (errcode != arg_in_range) { 3244 jio_fprintf(defaultStream::error_stream(), 3245 "Invalid mark stack size: %s\n", option->optionString); 3246 describe_range_error(errcode); 3247 return JNI_EINVAL; 3248 } 3249 jio_fprintf(defaultStream::error_stream(), 3250 "Please use -XX:MarkStackSize in place of " 3251 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n"); 3252 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3253 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3254 julong max_stack_size = 0; 3255 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3256 if (errcode != arg_in_range) { 3257 jio_fprintf(defaultStream::error_stream(), 3258 "Invalid maximum mark stack size: %s\n", 3259 option->optionString); 3260 describe_range_error(errcode); 3261 return JNI_EINVAL; 3262 } 3263 jio_fprintf(defaultStream::error_stream(), 3264 "Please use -XX:MarkStackSizeMax in place of " 3265 "-XX:CMSMarkStackSizeMax in the future\n"); 3266 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3267 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3268 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3269 uintx conc_threads = 0; 3270 if (!parse_uintx(tail, &conc_threads, 1)) { 3271 jio_fprintf(defaultStream::error_stream(), 3272 "Invalid concurrent threads: %s\n", option->optionString); 3273 return JNI_EINVAL; 3274 } 3275 jio_fprintf(defaultStream::error_stream(), 3276 "Please use -XX:ConcGCThreads in place of " 3277 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n"); 3278 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3279 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3280 julong max_direct_memory_size = 0; 3281 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3282 if (errcode != arg_in_range) { 3283 jio_fprintf(defaultStream::error_stream(), 3284 "Invalid maximum direct memory size: %s\n", 3285 option->optionString); 3286 describe_range_error(errcode); 3287 return JNI_EINVAL; 3288 } 3289 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3290 #if !INCLUDE_MANAGEMENT 3291 } else if (match_option(option, "-XX:+ManagementServer")) { 3292 jio_fprintf(defaultStream::error_stream(), 3293 "ManagementServer is not supported in this VM.\n"); 3294 return JNI_ERR; 3295 #endif // INCLUDE_MANAGEMENT 3296 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3297 // Skip -XX:Flags= since that case has already been handled 3298 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3299 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3300 return JNI_EINVAL; 3301 } 3302 } 3303 // Unknown option 3304 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3305 return JNI_ERR; 3306 } 3307 } 3308 3309 // PrintSharedArchiveAndExit will turn on 3310 // -Xshare:on 3311 // -XX:+TraceClassPaths 3312 if (PrintSharedArchiveAndExit) { 3313 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3314 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3315 FLAG_SET_CMDLINE(bool, TraceClassPaths, true); 3316 } 3317 3318 // Change the default value for flags which have different default values 3319 // when working with older JDKs. 3320 #ifdef LINUX 3321 if (JDK_Version::current().compare_major(6) <= 0 && 3322 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3323 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3324 } 3325 #endif // LINUX 3326 fix_appclasspath(); 3327 return JNI_OK; 3328 } 3329 3330 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3331 // 3332 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3333 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3334 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3335 // path is treated as the current directory. 3336 // 3337 // This causes problems with CDS, which requires that all directories specified in the classpath 3338 // must be empty. In most cases, applications do NOT want to load classes from the current 3339 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3340 // scripts compatible with CDS. 3341 void Arguments::fix_appclasspath() { 3342 if (IgnoreEmptyClassPaths) { 3343 const char separator = *os::path_separator(); 3344 const char* src = _java_class_path->value(); 3345 3346 // skip over all the leading empty paths 3347 while (*src == separator) { 3348 src ++; 3349 } 3350 3351 char* copy = AllocateHeap(strlen(src) + 1, mtInternal); 3352 strncpy(copy, src, strlen(src) + 1); 3353 3354 // trim all trailing empty paths 3355 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3356 *tail = '\0'; 3357 } 3358 3359 char from[3] = {separator, separator, '\0'}; 3360 char to [2] = {separator, '\0'}; 3361 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3362 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3363 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3364 } 3365 3366 _java_class_path->set_value(copy); 3367 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3368 } 3369 3370 if (!PrintSharedArchiveAndExit) { 3371 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value()); 3372 } 3373 } 3374 3375 static bool has_jar_files(const char* directory) { 3376 DIR* dir = os::opendir(directory); 3377 if (dir == NULL) return false; 3378 3379 struct dirent *entry; 3380 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 3381 bool hasJarFile = false; 3382 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3383 const char* name = entry->d_name; 3384 const char* ext = name + strlen(name) - 4; 3385 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3386 } 3387 FREE_C_HEAP_ARRAY(char, dbuf); 3388 os::closedir(dir); 3389 return hasJarFile ; 3390 } 3391 3392 static int check_non_empty_dirs(const char* path) { 3393 const char separator = *os::path_separator(); 3394 const char* const end = path + strlen(path); 3395 int nonEmptyDirs = 0; 3396 while (path < end) { 3397 const char* tmp_end = strchr(path, separator); 3398 if (tmp_end == NULL) { 3399 if (has_jar_files(path)) { 3400 nonEmptyDirs++; 3401 jio_fprintf(defaultStream::output_stream(), 3402 "Non-empty directory: %s\n", path); 3403 } 3404 path = end; 3405 } else { 3406 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 3407 memcpy(dirpath, path, tmp_end - path); 3408 dirpath[tmp_end - path] = '\0'; 3409 if (has_jar_files(dirpath)) { 3410 nonEmptyDirs++; 3411 jio_fprintf(defaultStream::output_stream(), 3412 "Non-empty directory: %s\n", dirpath); 3413 } 3414 FREE_C_HEAP_ARRAY(char, dirpath); 3415 path = tmp_end + 1; 3416 } 3417 } 3418 return nonEmptyDirs; 3419 } 3420 3421 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3422 // check if the default lib/endorsed directory exists; if so, error 3423 char path[JVM_MAXPATHLEN]; 3424 const char* fileSep = os::file_separator(); 3425 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3426 3427 if (CheckEndorsedAndExtDirs) { 3428 int nonEmptyDirs = 0; 3429 // check endorsed directory 3430 nonEmptyDirs += check_non_empty_dirs(path); 3431 // check the extension directories 3432 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3433 if (nonEmptyDirs > 0) { 3434 return JNI_ERR; 3435 } 3436 } 3437 3438 DIR* dir = os::opendir(path); 3439 if (dir != NULL) { 3440 jio_fprintf(defaultStream::output_stream(), 3441 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3442 "in modular form will be supported via the concept of upgradeable modules.\n"); 3443 os::closedir(dir); 3444 return JNI_ERR; 3445 } 3446 3447 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3448 dir = os::opendir(path); 3449 if (dir != NULL) { 3450 jio_fprintf(defaultStream::output_stream(), 3451 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3452 "Use -classpath instead.\n."); 3453 os::closedir(dir); 3454 return JNI_ERR; 3455 } 3456 3457 if (scp_assembly_required) { 3458 // Assemble the bootclasspath elements into the final path. 3459 Arguments::set_sysclasspath(scp_p->combined_path()); 3460 } 3461 3462 // This must be done after all arguments have been processed. 3463 // java_compiler() true means set to "NONE" or empty. 3464 if (java_compiler() && !xdebug_mode()) { 3465 // For backwards compatibility, we switch to interpreted mode if 3466 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3467 // not specified. 3468 set_mode_flags(_int); 3469 } 3470 3471 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3472 // but like -Xint, leave compilation thresholds unaffected. 3473 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3474 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3475 set_mode_flags(_int); 3476 } 3477 3478 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3479 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3480 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3481 } 3482 3483 #ifndef COMPILER2 3484 // Don't degrade server performance for footprint 3485 if (FLAG_IS_DEFAULT(UseLargePages) && 3486 MaxHeapSize < LargePageHeapSizeThreshold) { 3487 // No need for large granularity pages w/small heaps. 3488 // Note that large pages are enabled/disabled for both the 3489 // Java heap and the code cache. 3490 FLAG_SET_DEFAULT(UseLargePages, false); 3491 } 3492 3493 #else 3494 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3495 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3496 } 3497 #endif 3498 3499 #ifndef TIERED 3500 // Tiered compilation is undefined. 3501 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3502 #endif 3503 3504 // If we are running in a headless jre, force java.awt.headless property 3505 // to be true unless the property has already been set. 3506 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3507 if (os::is_headless_jre()) { 3508 const char* headless = Arguments::get_property("java.awt.headless"); 3509 if (headless == NULL) { 3510 char envbuffer[128]; 3511 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3512 if (!add_property("java.awt.headless=true")) { 3513 return JNI_ENOMEM; 3514 } 3515 } else { 3516 char buffer[256]; 3517 strcpy(buffer, "java.awt.headless="); 3518 strcat(buffer, envbuffer); 3519 if (!add_property(buffer)) { 3520 return JNI_ENOMEM; 3521 } 3522 } 3523 } 3524 } 3525 3526 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) { 3527 // CMS can only be used with ParNew 3528 FLAG_SET_ERGO(bool, UseParNewGC, true); 3529 } 3530 3531 if (!check_vm_args_consistency()) { 3532 return JNI_ERR; 3533 } 3534 3535 return JNI_OK; 3536 } 3537 3538 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3539 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3540 scp_assembly_required_p); 3541 } 3542 3543 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3544 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3545 scp_assembly_required_p); 3546 } 3547 3548 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3549 const int N_MAX_OPTIONS = 64; 3550 const int OPTION_BUFFER_SIZE = 1024; 3551 char buffer[OPTION_BUFFER_SIZE]; 3552 3553 // The variable will be ignored if it exceeds the length of the buffer. 3554 // Don't check this variable if user has special privileges 3555 // (e.g. unix su command). 3556 if (os::getenv(name, buffer, sizeof(buffer)) && 3557 !os::have_special_privileges()) { 3558 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3559 jio_fprintf(defaultStream::error_stream(), 3560 "Picked up %s: %s\n", name, buffer); 3561 char* rd = buffer; // pointer to the input string (rd) 3562 int i; 3563 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3564 while (isspace(*rd)) rd++; // skip whitespace 3565 if (*rd == 0) break; // we re done when the input string is read completely 3566 3567 // The output, option string, overwrites the input string. 3568 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3569 // input string (rd). 3570 char* wrt = rd; 3571 3572 options[i++].optionString = wrt; // Fill in option 3573 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3574 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3575 int quote = *rd; // matching quote to look for 3576 rd++; // don't copy open quote 3577 while (*rd != quote) { // include everything (even spaces) up until quote 3578 if (*rd == 0) { // string termination means unmatched string 3579 jio_fprintf(defaultStream::error_stream(), 3580 "Unmatched quote in %s\n", name); 3581 return JNI_ERR; 3582 } 3583 *wrt++ = *rd++; // copy to option string 3584 } 3585 rd++; // don't copy close quote 3586 } else { 3587 *wrt++ = *rd++; // copy to option string 3588 } 3589 } 3590 // Need to check if we're done before writing a NULL, 3591 // because the write could be to the byte that rd is pointing to. 3592 if (*rd++ == 0) { 3593 *wrt = 0; 3594 break; 3595 } 3596 *wrt = 0; // Zero terminate option 3597 } 3598 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3599 JavaVMInitArgs vm_args; 3600 vm_args.version = JNI_VERSION_1_2; 3601 vm_args.options = options; 3602 vm_args.nOptions = i; 3603 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3604 3605 if (PrintVMOptions) { 3606 const char* tail; 3607 for (int i = 0; i < vm_args.nOptions; i++) { 3608 const JavaVMOption *option = vm_args.options + i; 3609 if (match_option(option, "-XX:", &tail)) { 3610 logOption(tail); 3611 } 3612 } 3613 } 3614 3615 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR)); 3616 } 3617 return JNI_OK; 3618 } 3619 3620 void Arguments::set_shared_spaces_flags() { 3621 if (DumpSharedSpaces) { 3622 if (RequireSharedSpaces) { 3623 warning("cannot dump shared archive while using shared archive"); 3624 } 3625 UseSharedSpaces = false; 3626 #ifdef _LP64 3627 if (!UseCompressedOops || !UseCompressedClassPointers) { 3628 vm_exit_during_initialization( 3629 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3630 } 3631 } else { 3632 if (!UseCompressedOops || !UseCompressedClassPointers) { 3633 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3634 } 3635 #endif 3636 } 3637 } 3638 3639 #if !INCLUDE_ALL_GCS 3640 static void force_serial_gc() { 3641 FLAG_SET_DEFAULT(UseSerialGC, true); 3642 UNSUPPORTED_GC_OPTION(UseG1GC); 3643 UNSUPPORTED_GC_OPTION(UseParallelGC); 3644 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3645 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3646 UNSUPPORTED_GC_OPTION(UseParNewGC); 3647 } 3648 #endif // INCLUDE_ALL_GCS 3649 3650 // Sharing support 3651 // Construct the path to the archive 3652 static char* get_shared_archive_path() { 3653 char *shared_archive_path; 3654 if (SharedArchiveFile == NULL) { 3655 char jvm_path[JVM_MAXPATHLEN]; 3656 os::jvm_path(jvm_path, sizeof(jvm_path)); 3657 char *end = strrchr(jvm_path, *os::file_separator()); 3658 if (end != NULL) *end = '\0'; 3659 size_t jvm_path_len = strlen(jvm_path); 3660 size_t file_sep_len = strlen(os::file_separator()); 3661 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3662 file_sep_len + 20, mtInternal); 3663 if (shared_archive_path != NULL) { 3664 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3665 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3666 strncat(shared_archive_path, "classes.jsa", 11); 3667 } 3668 } else { 3669 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3670 if (shared_archive_path != NULL) { 3671 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3672 } 3673 } 3674 return shared_archive_path; 3675 } 3676 3677 #ifndef PRODUCT 3678 // Determine whether LogVMOutput should be implicitly turned on. 3679 static bool use_vm_log() { 3680 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3681 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3682 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3683 PrintAssembly || TraceDeoptimization || TraceDependencies || 3684 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3685 return true; 3686 } 3687 3688 #ifdef COMPILER1 3689 if (PrintC1Statistics) { 3690 return true; 3691 } 3692 #endif // COMPILER1 3693 3694 #ifdef COMPILER2 3695 if (PrintOptoAssembly || PrintOptoStatistics) { 3696 return true; 3697 } 3698 #endif // COMPILER2 3699 3700 return false; 3701 } 3702 #endif // PRODUCT 3703 3704 // Parse entry point called from JNI_CreateJavaVM 3705 3706 jint Arguments::parse(const JavaVMInitArgs* args) { 3707 3708 // Remaining part of option string 3709 const char* tail; 3710 3711 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3712 const char* hotspotrc = ".hotspotrc"; 3713 bool settings_file_specified = false; 3714 bool needs_hotspotrc_warning = false; 3715 3716 const char* flags_file; 3717 int index; 3718 for (index = 0; index < args->nOptions; index++) { 3719 const JavaVMOption *option = args->options + index; 3720 if (ArgumentsExt::process_options(option)) { 3721 continue; 3722 } 3723 if (match_option(option, "-XX:Flags=", &tail)) { 3724 flags_file = tail; 3725 settings_file_specified = true; 3726 continue; 3727 } 3728 if (match_option(option, "-XX:+PrintVMOptions")) { 3729 PrintVMOptions = true; 3730 continue; 3731 } 3732 if (match_option(option, "-XX:-PrintVMOptions")) { 3733 PrintVMOptions = false; 3734 continue; 3735 } 3736 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3737 IgnoreUnrecognizedVMOptions = true; 3738 continue; 3739 } 3740 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3741 IgnoreUnrecognizedVMOptions = false; 3742 continue; 3743 } 3744 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3745 CommandLineFlags::printFlags(tty, false); 3746 vm_exit(0); 3747 } 3748 #if INCLUDE_NMT 3749 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3750 // The launcher did not setup nmt environment variable properly. 3751 if (!MemTracker::check_launcher_nmt_support(tail)) { 3752 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3753 } 3754 3755 // Verify if nmt option is valid. 3756 if (MemTracker::verify_nmt_option()) { 3757 // Late initialization, still in single-threaded mode. 3758 if (MemTracker::tracking_level() >= NMT_summary) { 3759 MemTracker::init(); 3760 } 3761 } else { 3762 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3763 } 3764 continue; 3765 } 3766 #endif 3767 3768 3769 #ifndef PRODUCT 3770 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3771 CommandLineFlags::printFlags(tty, true); 3772 vm_exit(0); 3773 } 3774 #endif 3775 } 3776 3777 if (IgnoreUnrecognizedVMOptions) { 3778 // uncast const to modify the flag args->ignoreUnrecognized 3779 *(jboolean*)(&args->ignoreUnrecognized) = true; 3780 } 3781 3782 // Parse specified settings file 3783 if (settings_file_specified) { 3784 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3785 return JNI_EINVAL; 3786 } 3787 } else { 3788 #ifdef ASSERT 3789 // Parse default .hotspotrc settings file 3790 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3791 return JNI_EINVAL; 3792 } 3793 #else 3794 struct stat buf; 3795 if (os::stat(hotspotrc, &buf) == 0) { 3796 needs_hotspotrc_warning = true; 3797 } 3798 #endif 3799 } 3800 3801 if (PrintVMOptions) { 3802 for (index = 0; index < args->nOptions; index++) { 3803 const JavaVMOption *option = args->options + index; 3804 if (match_option(option, "-XX:", &tail)) { 3805 logOption(tail); 3806 } 3807 } 3808 } 3809 3810 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3811 jint result = parse_vm_init_args(args); 3812 if (result != JNI_OK) { 3813 return result; 3814 } 3815 3816 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3817 SharedArchivePath = get_shared_archive_path(); 3818 if (SharedArchivePath == NULL) { 3819 return JNI_ENOMEM; 3820 } 3821 3822 // Set up VerifySharedSpaces 3823 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 3824 VerifySharedSpaces = true; 3825 } 3826 3827 // Delay warning until here so that we've had a chance to process 3828 // the -XX:-PrintWarnings flag 3829 if (needs_hotspotrc_warning) { 3830 warning("%s file is present but has been ignored. " 3831 "Run with -XX:Flags=%s to load the file.", 3832 hotspotrc, hotspotrc); 3833 } 3834 3835 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3836 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3837 #endif 3838 3839 ArgumentsExt::report_unsupported_options(); 3840 3841 #ifndef PRODUCT 3842 if (TraceBytecodesAt != 0) { 3843 TraceBytecodes = true; 3844 } 3845 if (CountCompiledCalls) { 3846 if (UseCounterDecay) { 3847 warning("UseCounterDecay disabled because CountCalls is set"); 3848 UseCounterDecay = false; 3849 } 3850 } 3851 #endif // PRODUCT 3852 3853 if (ScavengeRootsInCode == 0) { 3854 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3855 warning("forcing ScavengeRootsInCode non-zero"); 3856 } 3857 ScavengeRootsInCode = 1; 3858 } 3859 3860 if (PrintGCDetails) { 3861 // Turn on -verbose:gc options as well 3862 PrintGC = true; 3863 } 3864 3865 // Set object alignment values. 3866 set_object_alignment(); 3867 3868 #if !INCLUDE_ALL_GCS 3869 force_serial_gc(); 3870 #endif // INCLUDE_ALL_GCS 3871 #if !INCLUDE_CDS 3872 if (DumpSharedSpaces || RequireSharedSpaces) { 3873 jio_fprintf(defaultStream::error_stream(), 3874 "Shared spaces are not supported in this VM\n"); 3875 return JNI_ERR; 3876 } 3877 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3878 warning("Shared spaces are not supported in this VM"); 3879 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3880 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3881 } 3882 no_shared_spaces("CDS Disabled"); 3883 #endif // INCLUDE_CDS 3884 3885 return JNI_OK; 3886 } 3887 3888 jint Arguments::apply_ergo() { 3889 3890 // Set flags based on ergonomics. 3891 set_ergonomics_flags(); 3892 3893 set_shared_spaces_flags(); 3894 3895 // Check the GC selections again. 3896 if (!ArgumentsExt::check_gc_consistency_ergo()) { 3897 return JNI_EINVAL; 3898 } 3899 3900 if (TieredCompilation) { 3901 set_tiered_flags(); 3902 } else { 3903 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3904 if (CompilationPolicyChoice >= 2) { 3905 vm_exit_during_initialization( 3906 "Incompatible compilation policy selected", NULL); 3907 } 3908 // Scale CompileThreshold 3909 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 3910 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 3911 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 3912 } 3913 } 3914 3915 #ifdef COMPILER2 3916 #ifndef PRODUCT 3917 if (PrintIdealGraphLevel > 0) { 3918 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 3919 } 3920 #endif 3921 #endif 3922 3923 // Set heap size based on available physical memory 3924 set_heap_size(); 3925 3926 ArgumentsExt::set_gc_specific_flags(); 3927 3928 // Initialize Metaspace flags and alignments 3929 Metaspace::ergo_initialize(); 3930 3931 // Set bytecode rewriting flags 3932 set_bytecode_flags(); 3933 3934 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 3935 set_aggressive_opts_flags(); 3936 3937 // Turn off biased locking for locking debug mode flags, 3938 // which are subtly different from each other but neither works with 3939 // biased locking 3940 if (UseHeavyMonitors 3941 #ifdef COMPILER1 3942 || !UseFastLocking 3943 #endif // COMPILER1 3944 ) { 3945 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3946 // flag set to true on command line; warn the user that they 3947 // can't enable biased locking here 3948 warning("Biased Locking is not supported with locking debug flags" 3949 "; ignoring UseBiasedLocking flag." ); 3950 } 3951 UseBiasedLocking = false; 3952 } 3953 3954 #ifdef ZERO 3955 // Clear flags not supported on zero. 3956 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3957 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3958 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3959 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3960 #endif // CC_INTERP 3961 3962 #ifdef COMPILER2 3963 if (!EliminateLocks) { 3964 EliminateNestedLocks = false; 3965 } 3966 if (!Inline) { 3967 IncrementalInline = false; 3968 } 3969 #ifndef PRODUCT 3970 if (!IncrementalInline) { 3971 AlwaysIncrementalInline = false; 3972 } 3973 #endif 3974 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 3975 // nothing to use the profiling, turn if off 3976 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 3977 } 3978 #endif 3979 3980 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3981 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3982 DebugNonSafepoints = true; 3983 } 3984 3985 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3986 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3987 } 3988 3989 #ifndef PRODUCT 3990 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3991 if (use_vm_log()) { 3992 LogVMOutput = true; 3993 } 3994 } 3995 #endif // PRODUCT 3996 3997 if (PrintCommandLineFlags) { 3998 CommandLineFlags::printSetFlags(tty); 3999 } 4000 4001 // Apply CPU specific policy for the BiasedLocking 4002 if (UseBiasedLocking) { 4003 if (!VM_Version::use_biased_locking() && 4004 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4005 UseBiasedLocking = false; 4006 } 4007 } 4008 #ifdef COMPILER2 4009 if (!UseBiasedLocking || EmitSync != 0) { 4010 UseOptoBiasInlining = false; 4011 } 4012 #endif 4013 4014 return JNI_OK; 4015 } 4016 4017 jint Arguments::adjust_after_os() { 4018 if (UseNUMA) { 4019 if (UseParallelGC || UseParallelOldGC) { 4020 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4021 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4022 } 4023 } 4024 // UseNUMAInterleaving is set to ON for all collectors and 4025 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4026 // such as the parallel collector for Linux and Solaris will 4027 // interleave old gen and survivor spaces on top of NUMA 4028 // allocation policy for the eden space. 4029 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4030 // all platforms and ParallelGC on Windows will interleave all 4031 // of the heap spaces across NUMA nodes. 4032 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4033 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4034 } 4035 } 4036 return JNI_OK; 4037 } 4038 4039 int Arguments::PropertyList_count(SystemProperty* pl) { 4040 int count = 0; 4041 while(pl != NULL) { 4042 count++; 4043 pl = pl->next(); 4044 } 4045 return count; 4046 } 4047 4048 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4049 assert(key != NULL, "just checking"); 4050 SystemProperty* prop; 4051 for (prop = pl; prop != NULL; prop = prop->next()) { 4052 if (strcmp(key, prop->key()) == 0) return prop->value(); 4053 } 4054 return NULL; 4055 } 4056 4057 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4058 int count = 0; 4059 const char* ret_val = NULL; 4060 4061 while(pl != NULL) { 4062 if(count >= index) { 4063 ret_val = pl->key(); 4064 break; 4065 } 4066 count++; 4067 pl = pl->next(); 4068 } 4069 4070 return ret_val; 4071 } 4072 4073 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4074 int count = 0; 4075 char* ret_val = NULL; 4076 4077 while(pl != NULL) { 4078 if(count >= index) { 4079 ret_val = pl->value(); 4080 break; 4081 } 4082 count++; 4083 pl = pl->next(); 4084 } 4085 4086 return ret_val; 4087 } 4088 4089 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4090 SystemProperty* p = *plist; 4091 if (p == NULL) { 4092 *plist = new_p; 4093 } else { 4094 while (p->next() != NULL) { 4095 p = p->next(); 4096 } 4097 p->set_next(new_p); 4098 } 4099 } 4100 4101 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 4102 if (plist == NULL) 4103 return; 4104 4105 SystemProperty* new_p = new SystemProperty(k, v, true); 4106 PropertyList_add(plist, new_p); 4107 } 4108 4109 void Arguments::PropertyList_add(SystemProperty *element) { 4110 PropertyList_add(&_system_properties, element); 4111 } 4112 4113 // This add maintains unique property key in the list. 4114 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 4115 if (plist == NULL) 4116 return; 4117 4118 // If property key exist then update with new value. 4119 SystemProperty* prop; 4120 for (prop = *plist; prop != NULL; prop = prop->next()) { 4121 if (strcmp(k, prop->key()) == 0) { 4122 if (append) { 4123 prop->append_value(v); 4124 } else { 4125 prop->set_value(v); 4126 } 4127 return; 4128 } 4129 } 4130 4131 PropertyList_add(plist, k, v); 4132 } 4133 4134 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4135 // Returns true if all of the source pointed by src has been copied over to 4136 // the destination buffer pointed by buf. Otherwise, returns false. 4137 // Notes: 4138 // 1. If the length (buflen) of the destination buffer excluding the 4139 // NULL terminator character is not long enough for holding the expanded 4140 // pid characters, it also returns false instead of returning the partially 4141 // expanded one. 4142 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4143 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4144 char* buf, size_t buflen) { 4145 const char* p = src; 4146 char* b = buf; 4147 const char* src_end = &src[srclen]; 4148 char* buf_end = &buf[buflen - 1]; 4149 4150 while (p < src_end && b < buf_end) { 4151 if (*p == '%') { 4152 switch (*(++p)) { 4153 case '%': // "%%" ==> "%" 4154 *b++ = *p++; 4155 break; 4156 case 'p': { // "%p" ==> current process id 4157 // buf_end points to the character before the last character so 4158 // that we could write '\0' to the end of the buffer. 4159 size_t buf_sz = buf_end - b + 1; 4160 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4161 4162 // if jio_snprintf fails or the buffer is not long enough to hold 4163 // the expanded pid, returns false. 4164 if (ret < 0 || ret >= (int)buf_sz) { 4165 return false; 4166 } else { 4167 b += ret; 4168 assert(*b == '\0', "fail in copy_expand_pid"); 4169 if (p == src_end && b == buf_end + 1) { 4170 // reach the end of the buffer. 4171 return true; 4172 } 4173 } 4174 p++; 4175 break; 4176 } 4177 default : 4178 *b++ = '%'; 4179 } 4180 } else { 4181 *b++ = *p++; 4182 } 4183 } 4184 *b = '\0'; 4185 return (p == src_end); // return false if not all of the source was copied 4186 }