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 "gc/shared/cardTableRS.hpp" 32 #include "gc/shared/genCollectedHeap.hpp" 33 #include "gc/shared/referenceProcessor.hpp" 34 #include "gc/shared/taskqueue.hpp" 35 #include "memory/allocation.inline.hpp" 36 #include "memory/universe.inline.hpp" 37 #include "oops/oop.inline.hpp" 38 #include "prims/jvmtiExport.hpp" 39 #include "runtime/arguments.hpp" 40 #include "runtime/arguments_ext.hpp" 41 #include "runtime/globals_extension.hpp" 42 #include "runtime/java.hpp" 43 #include "runtime/os.hpp" 44 #include "runtime/vm_version.hpp" 45 #include "services/management.hpp" 46 #include "services/memTracker.hpp" 47 #include "utilities/defaultStream.hpp" 48 #include "utilities/macros.hpp" 49 #include "utilities/stringUtils.hpp" 50 #if INCLUDE_ALL_GCS 51 #include "gc/cms/compactibleFreeListSpace.hpp" 52 #include "gc/g1/g1CollectedHeap.inline.hpp" 53 #include "gc/parallel/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 size_t 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 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 96 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 97 98 char* Arguments::SharedArchivePath = NULL; 99 100 AgentLibraryList Arguments::_libraryList; 101 AgentLibraryList Arguments::_agentList; 102 103 abort_hook_t Arguments::_abort_hook = NULL; 104 exit_hook_t Arguments::_exit_hook = NULL; 105 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 106 107 108 SystemProperty *Arguments::_sun_boot_library_path = NULL; 109 SystemProperty *Arguments::_java_library_path = NULL; 110 SystemProperty *Arguments::_java_home = NULL; 111 SystemProperty *Arguments::_java_class_path = NULL; 112 SystemProperty *Arguments::_sun_boot_class_path = NULL; 113 114 char* Arguments::_ext_dirs = NULL; 115 116 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 117 // part of the option string. 118 static bool match_option(const JavaVMOption *option, const char* name, 119 const char** tail) { 120 int len = (int)strlen(name); 121 if (strncmp(option->optionString, name, len) == 0) { 122 *tail = option->optionString + len; 123 return true; 124 } else { 125 return false; 126 } 127 } 128 129 // Check if 'option' matches 'name'. No "tail" is allowed. 130 static bool match_option(const JavaVMOption *option, const char* name) { 131 const char* tail = NULL; 132 bool result = match_option(option, name, &tail); 133 if (tail != NULL && *tail == '\0') { 134 return result; 135 } else { 136 return false; 137 } 138 } 139 140 // Return true if any of the strings in null-terminated array 'names' matches. 141 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 142 // the option must match exactly. 143 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 144 bool tail_allowed) { 145 for (/* empty */; *names != NULL; ++names) { 146 if (match_option(option, *names, tail)) { 147 if (**tail == '\0' || tail_allowed && **tail == ':') { 148 return true; 149 } 150 } 151 } 152 return false; 153 } 154 155 static void logOption(const char* opt) { 156 if (PrintVMOptions) { 157 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 158 } 159 } 160 161 // Process java launcher properties. 162 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 163 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 164 // sun.java.launcher.pid is defined. 165 // Must do this before setting up other system properties, 166 // as some of them may depend on launcher type. 167 for (int index = 0; index < args->nOptions; index++) { 168 const JavaVMOption* option = args->options + index; 169 const char* tail; 170 171 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 172 process_java_launcher_argument(tail, option->extraInfo); 173 continue; 174 } 175 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 176 if (strcmp(tail, "true") == 0) { 177 _sun_java_launcher_is_altjvm = true; 178 } 179 continue; 180 } 181 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 182 _sun_java_launcher_pid = atoi(tail); 183 continue; 184 } 185 } 186 } 187 188 // Initialize system properties key and value. 189 void Arguments::init_system_properties() { 190 191 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 192 "Java Virtual Machine Specification", false)); 193 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 194 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 195 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 196 197 // Following are JVMTI agent writable properties. 198 // Properties values are set to NULL and they are 199 // os specific they are initialized in os::init_system_properties_values(). 200 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 201 _java_library_path = new SystemProperty("java.library.path", NULL, true); 202 _java_home = new SystemProperty("java.home", NULL, true); 203 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 204 205 _java_class_path = new SystemProperty("java.class.path", "", true); 206 207 // Add to System Property list. 208 PropertyList_add(&_system_properties, _sun_boot_library_path); 209 PropertyList_add(&_system_properties, _java_library_path); 210 PropertyList_add(&_system_properties, _java_home); 211 PropertyList_add(&_system_properties, _java_class_path); 212 PropertyList_add(&_system_properties, _sun_boot_class_path); 213 214 // Set OS specific system properties values 215 os::init_system_properties_values(); 216 } 217 218 219 // Update/Initialize System properties after JDK version number is known 220 void Arguments::init_version_specific_system_properties() { 221 enum { bufsz = 16 }; 222 char buffer[bufsz]; 223 const char* spec_vendor = "Sun Microsystems Inc."; 224 uint32_t spec_version = 0; 225 226 spec_vendor = "Oracle Corporation"; 227 spec_version = JDK_Version::current().major_version(); 228 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 229 230 PropertyList_add(&_system_properties, 231 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 232 PropertyList_add(&_system_properties, 233 new SystemProperty("java.vm.specification.version", buffer, false)); 234 PropertyList_add(&_system_properties, 235 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 236 } 237 238 /** 239 * Provide a slightly more user-friendly way of eliminating -XX flags. 240 * When a flag is eliminated, it can be added to this list in order to 241 * continue accepting this flag on the command-line, while issuing a warning 242 * and ignoring the value. Once the JDK version reaches the 'accept_until' 243 * limit, we flatly refuse to admit the existence of the flag. This allows 244 * a flag to die correctly over JDK releases using HSX. 245 * But now that HSX is no longer supported only options with a future 246 * accept_until value need to be listed, and the list can be pruned 247 * on each major release. 248 */ 249 typedef struct { 250 const char* name; 251 JDK_Version obsoleted_in; // when the flag went away 252 JDK_Version accept_until; // which version to start denying the existence 253 } ObsoleteFlag; 254 255 static ObsoleteFlag obsolete_jvm_flags[] = { 256 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 257 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 258 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 259 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 260 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 261 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 262 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 263 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) }, 264 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 265 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 266 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 267 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 268 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 269 #ifndef ZERO 270 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 271 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 272 #endif // ZERO 273 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 274 { "AdaptiveSizePausePolicy", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 275 { "ParallelGCRetainPLAB", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 276 { NULL, JDK_Version(0), JDK_Version(0) } 277 }; 278 279 // Returns true if the flag is obsolete and fits into the range specified 280 // for being ignored. In the case that the flag is ignored, the 'version' 281 // value is filled in with the version number when the flag became 282 // obsolete so that that value can be displayed to the user. 283 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 284 int i = 0; 285 assert(version != NULL, "Must provide a version buffer"); 286 while (obsolete_jvm_flags[i].name != NULL) { 287 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 288 // <flag>=xxx form 289 // [-|+]<flag> form 290 size_t len = strlen(flag_status.name); 291 if ((strncmp(flag_status.name, s, len) == 0) && 292 (strlen(s) == len)){ 293 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 294 *version = flag_status.obsoleted_in; 295 return true; 296 } 297 } 298 i++; 299 } 300 return false; 301 } 302 303 // Constructs the system class path (aka boot class path) from the following 304 // components, in order: 305 // 306 // prefix // from -Xbootclasspath/p:... 307 // base // from os::get_system_properties() or -Xbootclasspath= 308 // suffix // from -Xbootclasspath/a:... 309 // 310 // This could be AllStatic, but it isn't needed after argument processing is 311 // complete. 312 class SysClassPath: public StackObj { 313 public: 314 SysClassPath(const char* base); 315 ~SysClassPath(); 316 317 inline void set_base(const char* base); 318 inline void add_prefix(const char* prefix); 319 inline void add_suffix_to_prefix(const char* suffix); 320 inline void add_suffix(const char* suffix); 321 inline void reset_path(const char* base); 322 323 inline const char* get_base() const { return _items[_scp_base]; } 324 inline const char* get_prefix() const { return _items[_scp_prefix]; } 325 inline const char* get_suffix() const { return _items[_scp_suffix]; } 326 327 // Combine all the components into a single c-heap-allocated string; caller 328 // must free the string if/when no longer needed. 329 char* combined_path(); 330 331 private: 332 // Utility routines. 333 static char* add_to_path(const char* path, const char* str, bool prepend); 334 static char* add_jars_to_path(char* path, const char* directory); 335 336 inline void reset_item_at(int index); 337 338 // Array indices for the items that make up the sysclasspath. All except the 339 // base are allocated in the C heap and freed by this class. 340 enum { 341 _scp_prefix, // from -Xbootclasspath/p:... 342 _scp_base, // the default sysclasspath 343 _scp_suffix, // from -Xbootclasspath/a:... 344 _scp_nitems // the number of items, must be last. 345 }; 346 347 const char* _items[_scp_nitems]; 348 }; 349 350 SysClassPath::SysClassPath(const char* base) { 351 memset(_items, 0, sizeof(_items)); 352 _items[_scp_base] = base; 353 } 354 355 SysClassPath::~SysClassPath() { 356 // Free everything except the base. 357 for (int i = 0; i < _scp_nitems; ++i) { 358 if (i != _scp_base) reset_item_at(i); 359 } 360 } 361 362 inline void SysClassPath::set_base(const char* base) { 363 _items[_scp_base] = base; 364 } 365 366 inline void SysClassPath::add_prefix(const char* prefix) { 367 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 368 } 369 370 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 371 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 372 } 373 374 inline void SysClassPath::add_suffix(const char* suffix) { 375 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 376 } 377 378 inline void SysClassPath::reset_item_at(int index) { 379 assert(index < _scp_nitems && index != _scp_base, "just checking"); 380 if (_items[index] != NULL) { 381 FREE_C_HEAP_ARRAY(char, _items[index]); 382 _items[index] = NULL; 383 } 384 } 385 386 inline void SysClassPath::reset_path(const char* base) { 387 // Clear the prefix and suffix. 388 reset_item_at(_scp_prefix); 389 reset_item_at(_scp_suffix); 390 set_base(base); 391 } 392 393 //------------------------------------------------------------------------------ 394 395 396 // Combine the bootclasspath elements, some of which may be null, into a single 397 // c-heap-allocated string. 398 char* SysClassPath::combined_path() { 399 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 400 401 size_t lengths[_scp_nitems]; 402 size_t total_len = 0; 403 404 const char separator = *os::path_separator(); 405 406 // Get the lengths. 407 int i; 408 for (i = 0; i < _scp_nitems; ++i) { 409 if (_items[i] != NULL) { 410 lengths[i] = strlen(_items[i]); 411 // Include space for the separator char (or a NULL for the last item). 412 total_len += lengths[i] + 1; 413 } 414 } 415 assert(total_len > 0, "empty sysclasspath not allowed"); 416 417 // Copy the _items to a single string. 418 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 419 char* cp_tmp = cp; 420 for (i = 0; i < _scp_nitems; ++i) { 421 if (_items[i] != NULL) { 422 memcpy(cp_tmp, _items[i], lengths[i]); 423 cp_tmp += lengths[i]; 424 *cp_tmp++ = separator; 425 } 426 } 427 *--cp_tmp = '\0'; // Replace the extra separator. 428 return cp; 429 } 430 431 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 432 char* 433 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 434 char *cp; 435 436 assert(str != NULL, "just checking"); 437 if (path == NULL) { 438 size_t len = strlen(str) + 1; 439 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 440 memcpy(cp, str, len); // copy the trailing null 441 } else { 442 const char separator = *os::path_separator(); 443 size_t old_len = strlen(path); 444 size_t str_len = strlen(str); 445 size_t len = old_len + str_len + 2; 446 447 if (prepend) { 448 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 449 char* cp_tmp = cp; 450 memcpy(cp_tmp, str, str_len); 451 cp_tmp += str_len; 452 *cp_tmp = separator; 453 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 454 FREE_C_HEAP_ARRAY(char, path); 455 } else { 456 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 457 char* cp_tmp = cp + old_len; 458 *cp_tmp = separator; 459 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 460 } 461 } 462 return cp; 463 } 464 465 // Scan the directory and append any jar or zip files found to path. 466 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 467 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 468 DIR* dir = os::opendir(directory); 469 if (dir == NULL) return path; 470 471 char dir_sep[2] = { '\0', '\0' }; 472 size_t directory_len = strlen(directory); 473 const char fileSep = *os::file_separator(); 474 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 475 476 /* Scan the directory for jars/zips, appending them to path. */ 477 struct dirent *entry; 478 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 479 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 480 const char* name = entry->d_name; 481 const char* ext = name + strlen(name) - 4; 482 bool isJarOrZip = ext > name && 483 (os::file_name_strcmp(ext, ".jar") == 0 || 484 os::file_name_strcmp(ext, ".zip") == 0); 485 if (isJarOrZip) { 486 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 487 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 488 path = add_to_path(path, jarpath, false); 489 FREE_C_HEAP_ARRAY(char, jarpath); 490 } 491 } 492 FREE_C_HEAP_ARRAY(char, dbuf); 493 os::closedir(dir); 494 return path; 495 } 496 497 // Parses a memory size specification string. 498 static bool atomull(const char *s, julong* result) { 499 julong n = 0; 500 int args_read = 0; 501 bool is_hex = false; 502 // Skip leading 0[xX] for hexadecimal 503 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) { 504 s += 2; 505 is_hex = true; 506 args_read = sscanf(s, JULONG_FORMAT_X, &n); 507 } else { 508 args_read = sscanf(s, JULONG_FORMAT, &n); 509 } 510 if (args_read != 1) { 511 return false; 512 } 513 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) { 514 s++; 515 } 516 // 4705540: illegal if more characters are found after the first non-digit 517 if (strlen(s) > 1) { 518 return false; 519 } 520 switch (*s) { 521 case 'T': case 't': 522 *result = n * G * K; 523 // Check for overflow. 524 if (*result/((julong)G * K) != n) return false; 525 return true; 526 case 'G': case 'g': 527 *result = n * G; 528 if (*result/G != n) return false; 529 return true; 530 case 'M': case 'm': 531 *result = n * M; 532 if (*result/M != n) return false; 533 return true; 534 case 'K': case 'k': 535 *result = n * K; 536 if (*result/K != n) return false; 537 return true; 538 case '\0': 539 *result = n; 540 return true; 541 default: 542 return false; 543 } 544 } 545 546 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 547 if (size < min_size) return arg_too_small; 548 // Check that size will fit in a size_t (only relevant on 32-bit) 549 if (size > max_uintx) return arg_too_big; 550 return arg_in_range; 551 } 552 553 // Describe an argument out of range error 554 void Arguments::describe_range_error(ArgsRange errcode) { 555 switch(errcode) { 556 case arg_too_big: 557 jio_fprintf(defaultStream::error_stream(), 558 "The specified size exceeds the maximum " 559 "representable size.\n"); 560 break; 561 case arg_too_small: 562 case arg_unreadable: 563 case arg_in_range: 564 // do nothing for now 565 break; 566 default: 567 ShouldNotReachHere(); 568 } 569 } 570 571 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) { 572 return CommandLineFlags::boolAtPut(name, &value, origin); 573 } 574 575 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 576 double v; 577 if (sscanf(value, "%lf", &v) != 1) { 578 return false; 579 } 580 581 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 582 return true; 583 } 584 return false; 585 } 586 587 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 588 julong v; 589 intx intx_v; 590 bool is_neg = false; 591 // Check the sign first since atomull() parses only unsigned values. 592 if (*value == '-') { 593 if (!CommandLineFlags::intxAt(name, &intx_v)) { 594 return false; 595 } 596 value++; 597 is_neg = true; 598 } 599 if (!atomull(value, &v)) { 600 return false; 601 } 602 intx_v = (intx) v; 603 if (is_neg) { 604 intx_v = -intx_v; 605 } 606 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 607 return true; 608 } 609 uintx uintx_v = (uintx) v; 610 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 611 return true; 612 } 613 uint64_t uint64_t_v = (uint64_t) v; 614 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 615 return true; 616 } 617 size_t size_t_v = (size_t) v; 618 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) { 619 return true; 620 } 621 return false; 622 } 623 624 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 625 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 626 // Contract: CommandLineFlags always returns a pointer that needs freeing. 627 FREE_C_HEAP_ARRAY(char, value); 628 return true; 629 } 630 631 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 632 const char* old_value = ""; 633 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 634 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 635 size_t new_len = strlen(new_value); 636 const char* value; 637 char* free_this_too = NULL; 638 if (old_len == 0) { 639 value = new_value; 640 } else if (new_len == 0) { 641 value = old_value; 642 } else { 643 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 644 // each new setting adds another LINE to the switch: 645 sprintf(buf, "%s\n%s", old_value, new_value); 646 value = buf; 647 free_this_too = buf; 648 } 649 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 650 // CommandLineFlags always returns a pointer that needs freeing. 651 FREE_C_HEAP_ARRAY(char, value); 652 if (free_this_too != NULL) { 653 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 654 FREE_C_HEAP_ARRAY(char, free_this_too); 655 } 656 return true; 657 } 658 659 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 660 661 // range of acceptable characters spelled out for portability reasons 662 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 663 #define BUFLEN 255 664 char name[BUFLEN+1]; 665 char dummy; 666 667 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 668 return set_bool_flag(name, false, origin); 669 } 670 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 671 return set_bool_flag(name, true, origin); 672 } 673 674 char punct; 675 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 676 const char* value = strchr(arg, '=') + 1; 677 Flag* flag = Flag::find_flag(name, strlen(name)); 678 if (flag != NULL && flag->is_ccstr()) { 679 if (flag->ccstr_accumulates()) { 680 return append_to_string_flag(name, value, origin); 681 } else { 682 if (value[0] == '\0') { 683 value = NULL; 684 } 685 return set_string_flag(name, value, origin); 686 } 687 } 688 } 689 690 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 691 const char* value = strchr(arg, '=') + 1; 692 // -XX:Foo:=xxx will reset the string flag to the given value. 693 if (value[0] == '\0') { 694 value = NULL; 695 } 696 return set_string_flag(name, value, origin); 697 } 698 699 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 700 #define SIGNED_NUMBER_RANGE "[-0123456789]" 701 #define NUMBER_RANGE "[0123456789]" 702 char value[BUFLEN + 1]; 703 char value2[BUFLEN + 1]; 704 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 705 // Looks like a floating-point number -- try again with more lenient format string 706 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 707 return set_fp_numeric_flag(name, value, origin); 708 } 709 } 710 711 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 712 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 713 return set_numeric_flag(name, value, origin); 714 } 715 716 return false; 717 } 718 719 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 720 assert(bldarray != NULL, "illegal argument"); 721 722 if (arg == NULL) { 723 return; 724 } 725 726 int new_count = *count + 1; 727 728 // expand the array and add arg to the last element 729 if (*bldarray == NULL) { 730 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 731 } else { 732 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 733 } 734 (*bldarray)[*count] = os::strdup_check_oom(arg); 735 *count = new_count; 736 } 737 738 void Arguments::build_jvm_args(const char* arg) { 739 add_string(&_jvm_args_array, &_num_jvm_args, arg); 740 } 741 742 void Arguments::build_jvm_flags(const char* arg) { 743 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 744 } 745 746 // utility function to return a string that concatenates all 747 // strings in a given char** array 748 const char* Arguments::build_resource_string(char** args, int count) { 749 if (args == NULL || count == 0) { 750 return NULL; 751 } 752 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 753 for (int i = 1; i < count; i++) { 754 length += strlen(args[i]) + 1; // add 1 for a space 755 } 756 char* s = NEW_RESOURCE_ARRAY(char, length); 757 strcpy(s, args[0]); 758 for (int j = 1; j < count; j++) { 759 strcat(s, " "); 760 strcat(s, args[j]); 761 } 762 return (const char*) s; 763 } 764 765 void Arguments::print_on(outputStream* st) { 766 st->print_cr("VM Arguments:"); 767 if (num_jvm_flags() > 0) { 768 st->print("jvm_flags: "); print_jvm_flags_on(st); 769 } 770 if (num_jvm_args() > 0) { 771 st->print("jvm_args: "); print_jvm_args_on(st); 772 } 773 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 774 if (_java_class_path != NULL) { 775 char* path = _java_class_path->value(); 776 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 777 } 778 st->print_cr("Launcher Type: %s", _sun_java_launcher); 779 } 780 781 void Arguments::print_jvm_flags_on(outputStream* st) { 782 if (_num_jvm_flags > 0) { 783 for (int i=0; i < _num_jvm_flags; i++) { 784 st->print("%s ", _jvm_flags_array[i]); 785 } 786 st->cr(); 787 } 788 } 789 790 void Arguments::print_jvm_args_on(outputStream* st) { 791 if (_num_jvm_args > 0) { 792 for (int i=0; i < _num_jvm_args; i++) { 793 st->print("%s ", _jvm_args_array[i]); 794 } 795 st->cr(); 796 } 797 } 798 799 bool Arguments::process_argument(const char* arg, 800 jboolean ignore_unrecognized, Flag::Flags origin) { 801 802 JDK_Version since = JDK_Version(); 803 804 if (parse_argument(arg, origin) || ignore_unrecognized) { 805 return true; 806 } 807 808 // Determine if the flag has '+', '-', or '=' characters. 809 bool has_plus_minus = (*arg == '+' || *arg == '-'); 810 const char* const argname = has_plus_minus ? arg + 1 : arg; 811 812 size_t arg_len; 813 const char* equal_sign = strchr(argname, '='); 814 if (equal_sign == NULL) { 815 arg_len = strlen(argname); 816 } else { 817 arg_len = equal_sign - argname; 818 } 819 820 // Construct a string which consists only of the argument name without '+', '-', or '='. 821 char stripped_argname[256]; 822 strncpy(stripped_argname, argname, arg_len); 823 stripped_argname[arg_len] = '\0'; //strncpy doesn't null terminate. 824 825 if (is_newly_obsolete(stripped_argname, &since)) { 826 char version[256]; 827 since.to_string(version, sizeof(version)); 828 warning("ignoring option %s; support was removed in %s", stripped_argname, version); 829 return true; 830 } 831 832 // For locked flags, report a custom error message if available. 833 // Otherwise, report the standard unrecognized VM option. 834 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 835 if (found_flag != NULL) { 836 char locked_message_buf[BUFLEN]; 837 found_flag->get_locked_message(locked_message_buf, BUFLEN); 838 if (strlen(locked_message_buf) == 0) { 839 if (found_flag->is_bool() && !has_plus_minus) { 840 jio_fprintf(defaultStream::error_stream(), 841 "Missing +/- setting for VM option '%s'\n", argname); 842 } else if (!found_flag->is_bool() && has_plus_minus) { 843 jio_fprintf(defaultStream::error_stream(), 844 "Unexpected +/- setting in VM option '%s'\n", argname); 845 } else { 846 jio_fprintf(defaultStream::error_stream(), 847 "Improperly specified VM option '%s'\n", argname); 848 } 849 } else { 850 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 851 } 852 } else { 853 jio_fprintf(defaultStream::error_stream(), 854 "Unrecognized VM option '%s'\n", argname); 855 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 856 if (fuzzy_matched != NULL) { 857 jio_fprintf(defaultStream::error_stream(), 858 "Did you mean '%s%s%s'? ", 859 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 860 fuzzy_matched->_name, 861 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 862 } 863 } 864 865 // allow for commandline "commenting out" options like -XX:#+Verbose 866 return arg[0] == '#'; 867 } 868 869 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 870 FILE* stream = fopen(file_name, "rb"); 871 if (stream == NULL) { 872 if (should_exist) { 873 jio_fprintf(defaultStream::error_stream(), 874 "Could not open settings file %s\n", file_name); 875 return false; 876 } else { 877 return true; 878 } 879 } 880 881 char token[1024]; 882 int pos = 0; 883 884 bool in_white_space = true; 885 bool in_comment = false; 886 bool in_quote = false; 887 char quote_c = 0; 888 bool result = true; 889 890 int c = getc(stream); 891 while(c != EOF && pos < (int)(sizeof(token)-1)) { 892 if (in_white_space) { 893 if (in_comment) { 894 if (c == '\n') in_comment = false; 895 } else { 896 if (c == '#') in_comment = true; 897 else if (!isspace(c)) { 898 in_white_space = false; 899 token[pos++] = c; 900 } 901 } 902 } else { 903 if (c == '\n' || (!in_quote && isspace(c))) { 904 // token ends at newline, or at unquoted whitespace 905 // this allows a way to include spaces in string-valued options 906 token[pos] = '\0'; 907 logOption(token); 908 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 909 build_jvm_flags(token); 910 pos = 0; 911 in_white_space = true; 912 in_quote = false; 913 } else if (!in_quote && (c == '\'' || c == '"')) { 914 in_quote = true; 915 quote_c = c; 916 } else if (in_quote && (c == quote_c)) { 917 in_quote = false; 918 } else { 919 token[pos++] = c; 920 } 921 } 922 c = getc(stream); 923 } 924 if (pos > 0) { 925 token[pos] = '\0'; 926 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 927 build_jvm_flags(token); 928 } 929 fclose(stream); 930 return result; 931 } 932 933 //============================================================================================================= 934 // Parsing of properties (-D) 935 936 const char* Arguments::get_property(const char* key) { 937 return PropertyList_get_value(system_properties(), key); 938 } 939 940 bool Arguments::add_property(const char* prop) { 941 const char* eq = strchr(prop, '='); 942 char* key; 943 // ns must be static--its address may be stored in a SystemProperty object. 944 const static char ns[1] = {0}; 945 char* value = (char *)ns; 946 947 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 948 key = AllocateHeap(key_len + 1, mtInternal); 949 strncpy(key, prop, key_len); 950 key[key_len] = '\0'; 951 952 if (eq != NULL) { 953 size_t value_len = strlen(prop) - key_len - 1; 954 value = AllocateHeap(value_len + 1, mtInternal); 955 strncpy(value, &prop[key_len + 1], value_len + 1); 956 } 957 958 if (strcmp(key, "java.compiler") == 0) { 959 process_java_compiler_argument(value); 960 FreeHeap(key); 961 if (eq != NULL) { 962 FreeHeap(value); 963 } 964 return true; 965 } else if (strcmp(key, "sun.java.command") == 0) { 966 _java_command = value; 967 968 // Record value in Arguments, but let it get passed to Java. 969 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 970 strcmp(key, "sun.java.launcher.pid") == 0) { 971 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 972 // private and are processed in process_sun_java_launcher_properties(); 973 // the sun.java.launcher property is passed on to the java application 974 FreeHeap(key); 975 if (eq != NULL) { 976 FreeHeap(value); 977 } 978 return true; 979 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 980 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 981 // its value without going through the property list or making a Java call. 982 _java_vendor_url_bug = value; 983 } else if (strcmp(key, "sun.boot.library.path") == 0) { 984 PropertyList_unique_add(&_system_properties, key, value, true); 985 return true; 986 } 987 // Create new property and add at the end of the list 988 PropertyList_unique_add(&_system_properties, key, value); 989 return true; 990 } 991 992 //=========================================================================================================== 993 // Setting int/mixed/comp mode flags 994 995 void Arguments::set_mode_flags(Mode mode) { 996 // Set up default values for all flags. 997 // If you add a flag to any of the branches below, 998 // add a default value for it here. 999 set_java_compiler(false); 1000 _mode = mode; 1001 1002 // Ensure Agent_OnLoad has the correct initial values. 1003 // This may not be the final mode; mode may change later in onload phase. 1004 PropertyList_unique_add(&_system_properties, "java.vm.info", 1005 (char*)VM_Version::vm_info_string(), false); 1006 1007 UseInterpreter = true; 1008 UseCompiler = true; 1009 UseLoopCounter = true; 1010 1011 // Default values may be platform/compiler dependent - 1012 // use the saved values 1013 ClipInlining = Arguments::_ClipInlining; 1014 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1015 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1016 BackgroundCompilation = Arguments::_BackgroundCompilation; 1017 if (TieredCompilation) { 1018 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1019 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1020 } 1021 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1022 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1023 } 1024 } 1025 1026 // Change from defaults based on mode 1027 switch (mode) { 1028 default: 1029 ShouldNotReachHere(); 1030 break; 1031 case _int: 1032 UseCompiler = false; 1033 UseLoopCounter = false; 1034 AlwaysCompileLoopMethods = false; 1035 UseOnStackReplacement = false; 1036 break; 1037 case _mixed: 1038 // same as default 1039 break; 1040 case _comp: 1041 UseInterpreter = false; 1042 BackgroundCompilation = false; 1043 ClipInlining = false; 1044 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1045 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1046 // compile a level 4 (C2) and then continue executing it. 1047 if (TieredCompilation) { 1048 Tier3InvokeNotifyFreqLog = 0; 1049 Tier4InvocationThreshold = 0; 1050 } 1051 break; 1052 } 1053 } 1054 1055 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1056 // Conflict: required to use shared spaces (-Xshare:on), but 1057 // incompatible command line options were chosen. 1058 1059 static void no_shared_spaces(const char* message) { 1060 if (RequireSharedSpaces) { 1061 jio_fprintf(defaultStream::error_stream(), 1062 "Class data sharing is inconsistent with other specified options.\n"); 1063 vm_exit_during_initialization("Unable to use shared archive.", message); 1064 } else { 1065 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1066 } 1067 } 1068 #endif 1069 1070 // Returns threshold scaled with the value of scale. 1071 // If scale < 0.0, threshold is returned without scaling. 1072 intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1073 if (scale == 1.0 || scale < 0.0) { 1074 return threshold; 1075 } else { 1076 return (intx)(threshold * scale); 1077 } 1078 } 1079 1080 // Returns freq_log scaled with the value of scale. 1081 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1082 // If scale < 0.0, freq_log is returned without scaling. 1083 intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1084 // Check if scaling is necessary or if negative value was specified. 1085 if (scale == 1.0 || scale < 0.0) { 1086 return freq_log; 1087 } 1088 // Check values to avoid calculating log2 of 0. 1089 if (scale == 0.0 || freq_log == 0) { 1090 return 0; 1091 } 1092 // Determine the maximum notification frequency value currently supported. 1093 // The largest mask value that the interpreter/C1 can handle is 1094 // of length InvocationCounter::number_of_count_bits. Mask values are always 1095 // one bit shorter then the value of the notification frequency. Set 1096 // max_freq_bits accordingly. 1097 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1098 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1099 if (scaled_freq == 0) { 1100 // Return 0 right away to avoid calculating log2 of 0. 1101 return 0; 1102 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1103 return max_freq_bits; 1104 } else { 1105 return log2_intptr(scaled_freq); 1106 } 1107 } 1108 1109 void Arguments::set_tiered_flags() { 1110 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1111 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1112 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1113 } 1114 if (CompilationPolicyChoice < 2) { 1115 vm_exit_during_initialization( 1116 "Incompatible compilation policy selected", NULL); 1117 } 1118 // Increase the code cache size - tiered compiles a lot more. 1119 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1120 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1121 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1122 } 1123 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1124 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1125 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1126 1127 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1128 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap) 1129 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) { 1130 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1131 } 1132 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) { 1133 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1134 } 1135 // Check consistency of code heap sizes 1136 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 1137 jio_fprintf(defaultStream::error_stream(), 1138 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 1139 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 1140 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 1141 vm_exit(1); 1142 } 1143 } 1144 } 1145 if (!UseInterpreter) { // -Xcomp 1146 Tier3InvokeNotifyFreqLog = 0; 1147 Tier4InvocationThreshold = 0; 1148 } 1149 1150 if (CompileThresholdScaling < 0) { 1151 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1152 } 1153 1154 // Scale tiered compilation thresholds. 1155 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1156 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1157 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1158 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1159 1160 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1161 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1162 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1163 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1164 1165 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1166 // once these thresholds become supported. 1167 1168 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1169 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1170 1171 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1172 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1173 1174 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1175 1176 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1177 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1178 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1179 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1180 } 1181 } 1182 1183 /** 1184 * Returns the minimum number of compiler threads needed to run the JVM. The following 1185 * configurations are possible. 1186 * 1187 * 1) The JVM is build using an interpreter only. As a result, the minimum number of 1188 * compiler threads is 0. 1189 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As 1190 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1. 1191 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However, 1192 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only 1193 * C1 can be used, so the minimum number of compiler threads is 1. 1194 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option 1195 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result, 1196 * the minimum number of compiler threads is 2. 1197 */ 1198 int Arguments::get_min_number_of_compiler_threads() { 1199 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 1200 return 0; // case 1 1201 #else 1202 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) { 1203 return 1; // case 2 or case 3 1204 } 1205 return 2; // case 4 (tiered) 1206 #endif 1207 } 1208 1209 #if INCLUDE_ALL_GCS 1210 static void disable_adaptive_size_policy(const char* collector_name) { 1211 if (UseAdaptiveSizePolicy) { 1212 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1213 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1214 collector_name); 1215 } 1216 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1217 } 1218 } 1219 1220 void Arguments::set_parnew_gc_flags() { 1221 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1222 "control point invariant"); 1223 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1224 assert(UseParNewGC, "ParNew should always be used with CMS"); 1225 1226 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1227 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1228 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1229 } else if (ParallelGCThreads == 0) { 1230 jio_fprintf(defaultStream::error_stream(), 1231 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1232 vm_exit(1); 1233 } 1234 1235 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1236 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1237 // we set them to 1024 and 1024. 1238 // See CR 6362902. 1239 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1240 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1241 } 1242 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1243 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1244 } 1245 1246 // When using compressed oops, we use local overflow stacks, 1247 // rather than using a global overflow list chained through 1248 // the klass word of the object's pre-image. 1249 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1250 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1251 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1252 } 1253 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1254 } 1255 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1256 } 1257 1258 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1259 // sparc/solaris for certain applications, but would gain from 1260 // further optimization and tuning efforts, and would almost 1261 // certainly gain from analysis of platform and environment. 1262 void Arguments::set_cms_and_parnew_gc_flags() { 1263 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1264 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1265 assert(UseParNewGC, "ParNew should always be used with CMS"); 1266 1267 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1268 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1269 1270 set_parnew_gc_flags(); 1271 1272 size_t max_heap = align_size_down(MaxHeapSize, 1273 CardTableRS::ct_max_alignment_constraint()); 1274 1275 // Now make adjustments for CMS 1276 intx tenuring_default = (intx)6; 1277 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1278 1279 // Preferred young gen size for "short" pauses: 1280 // upper bound depends on # of threads and NewRatio. 1281 const size_t preferred_max_new_size_unaligned = 1282 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads)); 1283 size_t preferred_max_new_size = 1284 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1285 1286 // Unless explicitly requested otherwise, size young gen 1287 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1288 1289 // If either MaxNewSize or NewRatio is set on the command line, 1290 // assume the user is trying to set the size of the young gen. 1291 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1292 1293 // Set MaxNewSize to our calculated preferred_max_new_size unless 1294 // NewSize was set on the command line and it is larger than 1295 // preferred_max_new_size. 1296 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1297 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1298 } else { 1299 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size); 1300 } 1301 if (PrintGCDetails && Verbose) { 1302 // Too early to use gclog_or_tty 1303 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1304 } 1305 1306 // Code along this path potentially sets NewSize and OldSize 1307 if (PrintGCDetails && Verbose) { 1308 // Too early to use gclog_or_tty 1309 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1310 " initial_heap_size: " SIZE_FORMAT 1311 " max_heap: " SIZE_FORMAT, 1312 min_heap_size(), InitialHeapSize, max_heap); 1313 } 1314 size_t min_new = preferred_max_new_size; 1315 if (FLAG_IS_CMDLINE(NewSize)) { 1316 min_new = NewSize; 1317 } 1318 if (max_heap > min_new && min_heap_size() > min_new) { 1319 // Unless explicitly requested otherwise, make young gen 1320 // at least min_new, and at most preferred_max_new_size. 1321 if (FLAG_IS_DEFAULT(NewSize)) { 1322 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new)); 1323 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize)); 1324 if (PrintGCDetails && Verbose) { 1325 // Too early to use gclog_or_tty 1326 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1327 } 1328 } 1329 // Unless explicitly requested otherwise, size old gen 1330 // so it's NewRatio x of NewSize. 1331 if (FLAG_IS_DEFAULT(OldSize)) { 1332 if (max_heap > NewSize) { 1333 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1334 if (PrintGCDetails && Verbose) { 1335 // Too early to use gclog_or_tty 1336 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1337 } 1338 } 1339 } 1340 } 1341 } 1342 // Unless explicitly requested otherwise, definitely 1343 // promote all objects surviving "tenuring_default" scavenges. 1344 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1345 FLAG_IS_DEFAULT(SurvivorRatio)) { 1346 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1347 } 1348 // If we decided above (or user explicitly requested) 1349 // `promote all' (via MaxTenuringThreshold := 0), 1350 // prefer minuscule survivor spaces so as not to waste 1351 // space for (non-existent) survivors 1352 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1353 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1354 } 1355 1356 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1357 // but rather the number of free blocks of a given size that are used when 1358 // replenishing the local per-worker free list caches. 1359 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1360 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1361 // OldPLAB sizing manually turned off: Use a larger default setting, 1362 // unless it was manually specified. This is because a too-low value 1363 // will slow down scavenges. 1364 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166 1365 } else { 1366 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1367 } 1368 } 1369 1370 // If either of the static initialization defaults have changed, note this 1371 // modification. 1372 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1373 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1374 } 1375 if (PrintGCDetails && Verbose) { 1376 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1377 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1378 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1379 } 1380 } 1381 #endif // INCLUDE_ALL_GCS 1382 1383 void set_object_alignment() { 1384 // Object alignment. 1385 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1386 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1387 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1388 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1389 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1390 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1391 1392 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1393 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1394 1395 // Oop encoding heap max 1396 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1397 1398 #if INCLUDE_ALL_GCS 1399 // Set CMS global values 1400 CompactibleFreeListSpace::set_cms_values(); 1401 #endif // INCLUDE_ALL_GCS 1402 } 1403 1404 bool verify_object_alignment() { 1405 // Object alignment. 1406 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1407 jio_fprintf(defaultStream::error_stream(), 1408 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1409 (int)ObjectAlignmentInBytes); 1410 return false; 1411 } 1412 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1413 jio_fprintf(defaultStream::error_stream(), 1414 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1415 (int)ObjectAlignmentInBytes, BytesPerLong); 1416 return false; 1417 } 1418 // It does not make sense to have big object alignment 1419 // since a space lost due to alignment will be greater 1420 // then a saved space from compressed oops. 1421 if ((int)ObjectAlignmentInBytes > 256) { 1422 jio_fprintf(defaultStream::error_stream(), 1423 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1424 (int)ObjectAlignmentInBytes); 1425 return false; 1426 } 1427 // In case page size is very small. 1428 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1429 jio_fprintf(defaultStream::error_stream(), 1430 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1431 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1432 return false; 1433 } 1434 if(SurvivorAlignmentInBytes == 0) { 1435 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1436 } else { 1437 if (!is_power_of_2(SurvivorAlignmentInBytes)) { 1438 jio_fprintf(defaultStream::error_stream(), 1439 "error: SurvivorAlignmentInBytes=%d must be power of 2\n", 1440 (int)SurvivorAlignmentInBytes); 1441 return false; 1442 } 1443 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) { 1444 jio_fprintf(defaultStream::error_stream(), 1445 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n", 1446 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes); 1447 return false; 1448 } 1449 } 1450 return true; 1451 } 1452 1453 size_t Arguments::max_heap_for_compressed_oops() { 1454 // Avoid sign flip. 1455 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1456 // We need to fit both the NULL page and the heap into the memory budget, while 1457 // keeping alignment constraints of the heap. To guarantee the latter, as the 1458 // NULL page is located before the heap, we pad the NULL page to the conservative 1459 // maximum alignment that the GC may ever impose upon the heap. 1460 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1461 _conservative_max_heap_alignment); 1462 1463 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1464 NOT_LP64(ShouldNotReachHere(); return 0); 1465 } 1466 1467 bool Arguments::should_auto_select_low_pause_collector() { 1468 if (UseAutoGCSelectPolicy && 1469 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1470 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1471 if (PrintGCDetails) { 1472 // Cannot use gclog_or_tty yet. 1473 tty->print_cr("Automatic selection of the low pause collector" 1474 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1475 } 1476 return true; 1477 } 1478 return false; 1479 } 1480 1481 void Arguments::set_use_compressed_oops() { 1482 #ifndef ZERO 1483 #ifdef _LP64 1484 // MaxHeapSize is not set up properly at this point, but 1485 // the only value that can override MaxHeapSize if we are 1486 // to use UseCompressedOops is InitialHeapSize. 1487 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1488 1489 if (max_heap_size <= max_heap_for_compressed_oops()) { 1490 #if !defined(COMPILER1) || defined(TIERED) 1491 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1492 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1493 } 1494 #endif 1495 } else { 1496 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1497 warning("Max heap size too large for Compressed Oops"); 1498 FLAG_SET_DEFAULT(UseCompressedOops, false); 1499 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1500 } 1501 } 1502 #endif // _LP64 1503 #endif // ZERO 1504 } 1505 1506 1507 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1508 // set_use_compressed_oops(). 1509 void Arguments::set_use_compressed_klass_ptrs() { 1510 #ifndef ZERO 1511 #ifdef _LP64 1512 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1513 if (!UseCompressedOops) { 1514 if (UseCompressedClassPointers) { 1515 warning("UseCompressedClassPointers requires UseCompressedOops"); 1516 } 1517 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1518 } else { 1519 // Turn on UseCompressedClassPointers too 1520 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1521 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1522 } 1523 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1524 if (UseCompressedClassPointers) { 1525 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1526 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1527 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1528 } 1529 } 1530 } 1531 #endif // _LP64 1532 #endif // !ZERO 1533 } 1534 1535 void Arguments::set_conservative_max_heap_alignment() { 1536 // The conservative maximum required alignment for the heap is the maximum of 1537 // the alignments imposed by several sources: any requirements from the heap 1538 // itself, the collector policy and the maximum page size we may run the VM 1539 // with. 1540 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1541 #if INCLUDE_ALL_GCS 1542 if (UseParallelGC) { 1543 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1544 } else if (UseG1GC) { 1545 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1546 } 1547 #endif // INCLUDE_ALL_GCS 1548 _conservative_max_heap_alignment = MAX4(heap_alignment, 1549 (size_t)os::vm_allocation_granularity(), 1550 os::max_page_size(), 1551 CollectorPolicy::compute_heap_alignment()); 1552 } 1553 1554 void Arguments::select_gc_ergonomically() { 1555 if (os::is_server_class_machine()) { 1556 if (should_auto_select_low_pause_collector()) { 1557 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1558 } else { 1559 FLAG_SET_ERGO(bool, UseParallelGC, true); 1560 } 1561 } else { 1562 FLAG_SET_ERGO(bool, UseSerialGC, true); 1563 } 1564 } 1565 1566 void Arguments::select_gc() { 1567 if (!gc_selected()) { 1568 select_gc_ergonomically(); 1569 guarantee(gc_selected(), "No GC selected"); 1570 } 1571 } 1572 1573 void Arguments::set_ergonomics_flags() { 1574 select_gc(); 1575 1576 #ifdef COMPILER2 1577 // Shared spaces work fine with other GCs but causes bytecode rewriting 1578 // to be disabled, which hurts interpreter performance and decreases 1579 // server performance. When -server is specified, keep the default off 1580 // unless it is asked for. Future work: either add bytecode rewriting 1581 // at link time, or rewrite bytecodes in non-shared methods. 1582 if (!DumpSharedSpaces && !RequireSharedSpaces && 1583 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1584 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1585 } 1586 #endif 1587 1588 set_conservative_max_heap_alignment(); 1589 1590 #ifndef ZERO 1591 #ifdef _LP64 1592 set_use_compressed_oops(); 1593 1594 // set_use_compressed_klass_ptrs() must be called after calling 1595 // set_use_compressed_oops(). 1596 set_use_compressed_klass_ptrs(); 1597 1598 // Also checks that certain machines are slower with compressed oops 1599 // in vm_version initialization code. 1600 #endif // _LP64 1601 #endif // !ZERO 1602 } 1603 1604 void Arguments::set_parallel_gc_flags() { 1605 assert(UseParallelGC || UseParallelOldGC, "Error"); 1606 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1607 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1608 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1609 } 1610 FLAG_SET_DEFAULT(UseParallelGC, true); 1611 1612 // If no heap maximum was requested explicitly, use some reasonable fraction 1613 // of the physical memory, up to a maximum of 1GB. 1614 FLAG_SET_DEFAULT(ParallelGCThreads, 1615 Abstract_VM_Version::parallel_worker_threads()); 1616 if (ParallelGCThreads == 0) { 1617 jio_fprintf(defaultStream::error_stream(), 1618 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1619 vm_exit(1); 1620 } 1621 1622 if (UseAdaptiveSizePolicy) { 1623 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1624 // unless the user actually sets these flags. 1625 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1626 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1627 _min_heap_free_ratio = MinHeapFreeRatio; 1628 } 1629 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1630 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1631 _max_heap_free_ratio = MaxHeapFreeRatio; 1632 } 1633 } 1634 1635 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1636 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1637 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1638 // See CR 6362902 for details. 1639 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1640 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1641 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1642 } 1643 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1644 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1645 } 1646 } 1647 1648 if (UseParallelOldGC) { 1649 // Par compact uses lower default values since they are treated as 1650 // minimums. These are different defaults because of the different 1651 // interpretation and are not ergonomically set. 1652 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1653 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1654 } 1655 } 1656 } 1657 1658 void Arguments::set_g1_gc_flags() { 1659 assert(UseG1GC, "Error"); 1660 #ifdef COMPILER1 1661 FastTLABRefill = false; 1662 #endif 1663 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1664 if (ParallelGCThreads == 0) { 1665 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1666 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1667 } 1668 1669 #if INCLUDE_ALL_GCS 1670 if (G1ConcRefinementThreads == 0) { 1671 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads); 1672 } 1673 #endif 1674 1675 // MarkStackSize will be set (if it hasn't been set by the user) 1676 // when concurrent marking is initialized. 1677 // Its value will be based upon the number of parallel marking threads. 1678 // But we do set the maximum mark stack size here. 1679 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1680 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1681 } 1682 1683 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1684 // In G1, we want the default GC overhead goal to be higher than 1685 // say in PS. So we set it here to 10%. Otherwise the heap might 1686 // be expanded more aggressively than we would like it to. In 1687 // fact, even 10% seems to not be high enough in some cases 1688 // (especially small GC stress tests that the main thing they do 1689 // is allocation). We might consider increase it further. 1690 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1691 } 1692 1693 if (PrintGCDetails && Verbose) { 1694 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1695 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1696 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1697 } 1698 } 1699 1700 #if !INCLUDE_ALL_GCS 1701 #ifdef ASSERT 1702 static bool verify_serial_gc_flags() { 1703 return (UseSerialGC && 1704 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC || 1705 UseParallelGC || UseParallelOldGC)); 1706 } 1707 #endif // ASSERT 1708 #endif // INCLUDE_ALL_GCS 1709 1710 void Arguments::set_gc_specific_flags() { 1711 #if INCLUDE_ALL_GCS 1712 // Set per-collector flags 1713 if (UseParallelGC || UseParallelOldGC) { 1714 set_parallel_gc_flags(); 1715 } else if (UseConcMarkSweepGC) { 1716 set_cms_and_parnew_gc_flags(); 1717 } else if (UseG1GC) { 1718 set_g1_gc_flags(); 1719 } 1720 check_deprecated_gc_flags(); 1721 if (AssumeMP && !UseSerialGC) { 1722 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 1723 warning("If the number of processors is expected to increase from one, then" 1724 " you should configure the number of parallel GC threads appropriately" 1725 " using -XX:ParallelGCThreads=N"); 1726 } 1727 } 1728 if (MinHeapFreeRatio == 100) { 1729 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1730 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 1731 } 1732 #else // INCLUDE_ALL_GCS 1733 assert(verify_serial_gc_flags(), "SerialGC unset"); 1734 #endif // INCLUDE_ALL_GCS 1735 } 1736 1737 julong Arguments::limit_by_allocatable_memory(julong limit) { 1738 julong max_allocatable; 1739 julong result = limit; 1740 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1741 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1742 } 1743 return result; 1744 } 1745 1746 // Use static initialization to get the default before parsing 1747 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1748 1749 void Arguments::set_heap_size() { 1750 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1751 // Deprecated flag 1752 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1753 } 1754 1755 const julong phys_mem = 1756 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1757 : (julong)MaxRAM; 1758 1759 // If the maximum heap size has not been set with -Xmx, 1760 // then set it as fraction of the size of physical memory, 1761 // respecting the maximum and minimum sizes of the heap. 1762 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1763 julong reasonable_max = phys_mem / MaxRAMFraction; 1764 1765 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1766 // Small physical memory, so use a minimum fraction of it for the heap 1767 reasonable_max = phys_mem / MinRAMFraction; 1768 } else { 1769 // Not-small physical memory, so require a heap at least 1770 // as large as MaxHeapSize 1771 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1772 } 1773 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1774 // Limit the heap size to ErgoHeapSizeLimit 1775 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1776 } 1777 if (UseCompressedOops) { 1778 // Limit the heap size to the maximum possible when using compressed oops 1779 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1780 1781 // HeapBaseMinAddress can be greater than default but not less than. 1782 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1783 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1784 // matches compressed oops printing flags 1785 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 1786 jio_fprintf(defaultStream::error_stream(), 1787 "HeapBaseMinAddress must be at least " SIZE_FORMAT 1788 " (" SIZE_FORMAT "G) which is greater than value given " 1789 SIZE_FORMAT "\n", 1790 DefaultHeapBaseMinAddress, 1791 DefaultHeapBaseMinAddress/G, 1792 HeapBaseMinAddress); 1793 } 1794 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1795 } 1796 } 1797 1798 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1799 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1800 // but it should be not less than default MaxHeapSize. 1801 max_coop_heap -= HeapBaseMinAddress; 1802 } 1803 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1804 } 1805 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1806 1807 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1808 // An initial heap size was specified on the command line, 1809 // so be sure that the maximum size is consistent. Done 1810 // after call to limit_by_allocatable_memory because that 1811 // method might reduce the allocation size. 1812 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1813 } 1814 1815 if (PrintGCDetails && Verbose) { 1816 // Cannot use gclog_or_tty yet. 1817 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1818 } 1819 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 1820 } 1821 1822 // If the minimum or initial heap_size have not been set or requested to be set 1823 // ergonomically, set them accordingly. 1824 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1825 julong reasonable_minimum = (julong)(OldSize + NewSize); 1826 1827 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1828 1829 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1830 1831 if (InitialHeapSize == 0) { 1832 julong reasonable_initial = phys_mem / InitialRAMFraction; 1833 1834 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1835 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1836 1837 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1838 1839 if (PrintGCDetails && Verbose) { 1840 // Cannot use gclog_or_tty yet. 1841 tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 1842 } 1843 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 1844 } 1845 // If the minimum heap size has not been set (via -Xms), 1846 // synchronize with InitialHeapSize to avoid errors with the default value. 1847 if (min_heap_size() == 0) { 1848 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1849 if (PrintGCDetails && Verbose) { 1850 // Cannot use gclog_or_tty yet. 1851 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1852 } 1853 } 1854 } 1855 } 1856 1857 // This must be called after ergonomics. 1858 void Arguments::set_bytecode_flags() { 1859 if (!RewriteBytecodes) { 1860 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1861 } 1862 } 1863 1864 // Aggressive optimization flags -XX:+AggressiveOpts 1865 void Arguments::set_aggressive_opts_flags() { 1866 #ifdef COMPILER2 1867 if (AggressiveUnboxing) { 1868 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1869 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1870 } else if (!EliminateAutoBox) { 1871 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1872 AggressiveUnboxing = false; 1873 } 1874 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1875 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1876 } else if (!DoEscapeAnalysis) { 1877 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1878 AggressiveUnboxing = false; 1879 } 1880 } 1881 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1882 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1883 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1884 } 1885 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1886 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1887 } 1888 1889 // Feed the cache size setting into the JDK 1890 char buffer[1024]; 1891 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1892 add_property(buffer); 1893 } 1894 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1895 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1896 } 1897 #endif 1898 1899 if (AggressiveOpts) { 1900 // Sample flag setting code 1901 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1902 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1903 // } 1904 } 1905 } 1906 1907 //=========================================================================================================== 1908 // Parsing of java.compiler property 1909 1910 void Arguments::process_java_compiler_argument(char* arg) { 1911 // For backwards compatibility, Djava.compiler=NONE or "" 1912 // causes us to switch to -Xint mode UNLESS -Xdebug 1913 // is also specified. 1914 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1915 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1916 } 1917 } 1918 1919 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1920 _sun_java_launcher = os::strdup_check_oom(launcher); 1921 } 1922 1923 bool Arguments::created_by_java_launcher() { 1924 assert(_sun_java_launcher != NULL, "property must have value"); 1925 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1926 } 1927 1928 bool Arguments::sun_java_launcher_is_altjvm() { 1929 return _sun_java_launcher_is_altjvm; 1930 } 1931 1932 //=========================================================================================================== 1933 // Parsing of main arguments 1934 1935 bool Arguments::verify_interval(uintx val, uintx min, 1936 uintx max, const char* name) { 1937 // Returns true iff value is in the inclusive interval [min..max] 1938 // false, otherwise. 1939 if (val >= min && val <= max) { 1940 return true; 1941 } 1942 jio_fprintf(defaultStream::error_stream(), 1943 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1944 " and " UINTX_FORMAT "\n", 1945 name, val, min, max); 1946 return false; 1947 } 1948 1949 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1950 // Returns true if given value is at least specified min threshold 1951 // false, otherwise. 1952 if (val >= min ) { 1953 return true; 1954 } 1955 jio_fprintf(defaultStream::error_stream(), 1956 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1957 name, val, min); 1958 return false; 1959 } 1960 1961 bool Arguments::verify_percentage(uintx value, const char* name) { 1962 if (is_percentage(value)) { 1963 return true; 1964 } 1965 jio_fprintf(defaultStream::error_stream(), 1966 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1967 name, value); 1968 return false; 1969 } 1970 1971 // check if do gclog rotation 1972 // +UseGCLogFileRotation is a must, 1973 // no gc log rotation when log file not supplied or 1974 // NumberOfGCLogFiles is 0 1975 void check_gclog_consistency() { 1976 if (UseGCLogFileRotation) { 1977 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { 1978 jio_fprintf(defaultStream::output_stream(), 1979 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" 1980 "where num_of_file > 0\n" 1981 "GC log rotation is turned off\n"); 1982 UseGCLogFileRotation = false; 1983 } 1984 } 1985 1986 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { 1987 FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K); 1988 jio_fprintf(defaultStream::output_stream(), 1989 "GCLogFileSize changed to minimum 8K\n"); 1990 } 1991 } 1992 1993 // This function is called for -Xloggc:<filename>, it can be used 1994 // to check if a given file name(or string) conforms to the following 1995 // specification: 1996 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 1997 // %p and %t only allowed once. We only limit usage of filename not path 1998 bool is_filename_valid(const char *file_name) { 1999 const char* p = file_name; 2000 char file_sep = os::file_separator()[0]; 2001 const char* cp; 2002 // skip prefix path 2003 for (cp = file_name; *cp != '\0'; cp++) { 2004 if (*cp == '/' || *cp == file_sep) { 2005 p = cp + 1; 2006 } 2007 } 2008 2009 int count_p = 0; 2010 int count_t = 0; 2011 while (*p != '\0') { 2012 if ((*p >= '0' && *p <= '9') || 2013 (*p >= 'A' && *p <= 'Z') || 2014 (*p >= 'a' && *p <= 'z') || 2015 *p == '-' || 2016 *p == '_' || 2017 *p == '.') { 2018 p++; 2019 continue; 2020 } 2021 if (*p == '%') { 2022 if(*(p + 1) == 'p') { 2023 p += 2; 2024 count_p ++; 2025 continue; 2026 } 2027 if (*(p + 1) == 't') { 2028 p += 2; 2029 count_t ++; 2030 continue; 2031 } 2032 } 2033 return false; 2034 } 2035 return count_p < 2 && count_t < 2; 2036 } 2037 2038 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) { 2039 if (!is_percentage(min_heap_free_ratio)) { 2040 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100"); 2041 return false; 2042 } 2043 if (min_heap_free_ratio > MaxHeapFreeRatio) { 2044 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 2045 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio, 2046 MaxHeapFreeRatio); 2047 return false; 2048 } 2049 // This does not set the flag itself, but stores the value in a safe place for later usage. 2050 _min_heap_free_ratio = min_heap_free_ratio; 2051 return true; 2052 } 2053 2054 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) { 2055 if (!is_percentage(max_heap_free_ratio)) { 2056 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100"); 2057 return false; 2058 } 2059 if (max_heap_free_ratio < MinHeapFreeRatio) { 2060 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or " 2061 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio, 2062 MinHeapFreeRatio); 2063 return false; 2064 } 2065 // This does not set the flag itself, but stores the value in a safe place for later usage. 2066 _max_heap_free_ratio = max_heap_free_ratio; 2067 return true; 2068 } 2069 2070 // Check consistency of GC selection 2071 bool Arguments::check_gc_consistency() { 2072 check_gclog_consistency(); 2073 // Ensure that the user has not selected conflicting sets 2074 // of collectors. 2075 uint i = 0; 2076 if (UseSerialGC) i++; 2077 if (UseConcMarkSweepGC) i++; 2078 if (UseParallelGC || UseParallelOldGC) i++; 2079 if (UseG1GC) i++; 2080 if (i > 1) { 2081 jio_fprintf(defaultStream::error_stream(), 2082 "Conflicting collector combinations in option list; " 2083 "please refer to the release notes for the combinations " 2084 "allowed\n"); 2085 return false; 2086 } 2087 2088 if (UseConcMarkSweepGC && !UseParNewGC) { 2089 jio_fprintf(defaultStream::error_stream(), 2090 "It is not possible to combine the DefNew young collector with the CMS collector.\n"); 2091 return false; 2092 } 2093 2094 if (UseParNewGC && !UseConcMarkSweepGC) { 2095 jio_fprintf(defaultStream::error_stream(), 2096 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n"); 2097 return false; 2098 } 2099 2100 return true; 2101 } 2102 2103 void Arguments::check_deprecated_gc_flags() { 2104 if (FLAG_IS_CMDLINE(UseParNewGC)) { 2105 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release"); 2106 } 2107 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 2108 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 2109 "and will likely be removed in future release"); 2110 } 2111 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 2112 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 2113 "Use MaxRAMFraction instead."); 2114 } 2115 } 2116 2117 // Check stack pages settings 2118 bool Arguments::check_stack_pages() 2119 { 2120 bool status = true; 2121 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 2122 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 2123 // greater stack shadow pages can't generate instruction to bang stack 2124 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 2125 return status; 2126 } 2127 2128 // Check the consistency of vm_init_args 2129 bool Arguments::check_vm_args_consistency() { 2130 // Method for adding checks for flag consistency. 2131 // The intent is to warn the user of all possible conflicts, 2132 // before returning an error. 2133 // Note: Needs platform-dependent factoring. 2134 bool status = true; 2135 2136 if (TLABRefillWasteFraction == 0) { 2137 jio_fprintf(defaultStream::error_stream(), 2138 "TLABRefillWasteFraction should be a denominator, " 2139 "not " SIZE_FORMAT "\n", 2140 TLABRefillWasteFraction); 2141 status = false; 2142 } 2143 2144 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 2145 "AdaptiveSizePolicyWeight"); 2146 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 2147 2148 // Divide by bucket size to prevent a large size from causing rollover when 2149 // calculating amount of memory needed to be allocated for the String table. 2150 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2151 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2152 2153 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize, 2154 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size"); 2155 2156 { 2157 // Using "else if" below to avoid printing two error messages if min > max. 2158 // This will also prevent us from reporting both min>100 and max>100 at the 2159 // same time, but that is less annoying than printing two identical errors IMHO. 2160 FormatBuffer<80> err_msg("%s",""); 2161 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) { 2162 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2163 status = false; 2164 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) { 2165 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2166 status = false; 2167 } 2168 } 2169 2170 // Min/MaxMetaspaceFreeRatio 2171 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2172 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2173 2174 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2175 jio_fprintf(defaultStream::error_stream(), 2176 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2177 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2178 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2179 MinMetaspaceFreeRatio, 2180 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2181 MaxMetaspaceFreeRatio); 2182 status = false; 2183 } 2184 2185 // Trying to keep 100% free is not practical 2186 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2187 2188 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2189 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2190 } 2191 2192 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2193 // Settings to encourage splitting. 2194 if (!FLAG_IS_CMDLINE(NewRatio)) { 2195 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2196 } 2197 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2198 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2199 } 2200 } 2201 2202 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2203 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2204 } 2205 2206 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2207 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2208 if (GCTimeLimit == 100) { 2209 // Turn off gc-overhead-limit-exceeded checks 2210 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2211 } 2212 2213 status = status && check_gc_consistency(); 2214 status = status && check_stack_pages(); 2215 2216 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2217 "CMSIncrementalSafetyFactor"); 2218 2219 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2220 // insists that we hold the requisite locks so that the iteration is 2221 // MT-safe. For the verification at start-up and shut-down, we don't 2222 // yet have a good way of acquiring and releasing these locks, 2223 // which are not visible at the CollectedHeap level. We want to 2224 // be able to acquire these locks and then do the iteration rather 2225 // than just disable the lock verification. This will be fixed under 2226 // bug 4788986. 2227 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2228 if (VerifyDuringStartup) { 2229 warning("Heap verification at start-up disabled " 2230 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2231 VerifyDuringStartup = false; // Disable verification at start-up 2232 } 2233 2234 if (VerifyBeforeExit) { 2235 warning("Heap verification at shutdown disabled " 2236 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2237 VerifyBeforeExit = false; // Disable verification at shutdown 2238 } 2239 } 2240 2241 // Note: only executed in non-PRODUCT mode 2242 if (!UseAsyncConcMarkSweepGC && 2243 (ExplicitGCInvokesConcurrent || 2244 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2245 jio_fprintf(defaultStream::error_stream(), 2246 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2247 " with -UseAsyncConcMarkSweepGC"); 2248 status = false; 2249 } 2250 2251 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2252 2253 #if INCLUDE_ALL_GCS 2254 if (UseG1GC) { 2255 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent"); 2256 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent"); 2257 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent"); 2258 2259 status = status && verify_percentage(G1ConfidencePercent, "G1ConfidencePercent"); 2260 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2261 "InitiatingHeapOccupancyPercent"); 2262 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2263 "G1RefProcDrainInterval"); 2264 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2265 "G1ConcMarkStepDurationMillis"); 2266 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2267 "G1ConcRSHotCardLimit"); 2268 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 27, 2269 "G1ConcRSLogCacheSize"); 2270 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age, 2271 "StringDeduplicationAgeThreshold"); 2272 } 2273 if (UseConcMarkSweepGC) { 2274 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2275 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2276 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2277 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2278 2279 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2280 2281 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2282 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2283 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2284 2285 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2286 2287 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2288 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2289 2290 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2291 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2292 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2293 2294 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2295 2296 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2297 2298 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2299 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2300 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2301 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2302 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2303 } 2304 2305 if (UseParallelGC || UseParallelOldGC) { 2306 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2307 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2308 2309 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2310 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2311 2312 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2313 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2314 2315 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2316 2317 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2318 } 2319 #endif // INCLUDE_ALL_GCS 2320 2321 status = status && verify_interval(RefDiscoveryPolicy, 2322 ReferenceProcessor::DiscoveryPolicyMin, 2323 ReferenceProcessor::DiscoveryPolicyMax, 2324 "RefDiscoveryPolicy"); 2325 2326 // Limit the lower bound of this flag to 1 as it is used in a division 2327 // expression. 2328 status = status && verify_interval(TLABWasteTargetPercent, 2329 1, 100, "TLABWasteTargetPercent"); 2330 2331 status = status && verify_object_alignment(); 2332 2333 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2334 "CompressedClassSpaceSize"); 2335 2336 status = status && verify_interval(MarkStackSizeMax, 2337 1, (max_jint - 1), "MarkStackSizeMax"); 2338 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2339 2340 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2341 2342 status = status && verify_min_value(HeapSizePerGCThread, (size_t) os::vm_page_size(), "HeapSizePerGCThread"); 2343 2344 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2345 2346 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2347 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2348 2349 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2350 2351 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2352 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2353 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2354 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2355 2356 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2357 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2358 2359 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2360 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2361 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2362 2363 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2364 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2365 2366 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold"); 2367 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold"); 2368 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2369 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2370 2371 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2372 #ifdef COMPILER1 2373 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize"); 2374 #endif 2375 status = status && verify_min_value(HeapSearchSteps, 1, "HeapSearchSteps"); 2376 2377 if (PrintNMTStatistics) { 2378 #if INCLUDE_NMT 2379 if (MemTracker::tracking_level() == NMT_off) { 2380 #endif // INCLUDE_NMT 2381 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2382 PrintNMTStatistics = false; 2383 #if INCLUDE_NMT 2384 } 2385 #endif 2386 } 2387 2388 // Need to limit the extent of the padding to reasonable size. 2389 // 8K is well beyond the reasonable HW cache line size, even with the 2390 // aggressive prefetching, while still leaving the room for segregating 2391 // among the distinct pages. 2392 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2393 jio_fprintf(defaultStream::error_stream(), 2394 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2395 ContendedPaddingWidth, 0, 8192); 2396 status = false; 2397 } 2398 2399 // Need to enforce the padding not to break the existing field alignments. 2400 // It is sufficient to check against the largest type size. 2401 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2402 jio_fprintf(defaultStream::error_stream(), 2403 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2404 ContendedPaddingWidth, BytesPerLong); 2405 status = false; 2406 } 2407 2408 // Check lower bounds of the code cache 2409 // Template Interpreter code is approximately 3X larger in debug builds. 2410 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2411 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2412 jio_fprintf(defaultStream::error_stream(), 2413 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2414 os::vm_page_size()/K); 2415 status = false; 2416 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2417 jio_fprintf(defaultStream::error_stream(), 2418 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2419 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2420 status = false; 2421 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2422 jio_fprintf(defaultStream::error_stream(), 2423 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2424 min_code_cache_size/K); 2425 status = false; 2426 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2427 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2428 jio_fprintf(defaultStream::error_stream(), 2429 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2430 CODE_CACHE_SIZE_LIMIT/M); 2431 status = false; 2432 } else if (NonNMethodCodeHeapSize < min_code_cache_size){ 2433 jio_fprintf(defaultStream::error_stream(), 2434 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2435 min_code_cache_size/K); 2436 status = false; 2437 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) 2438 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 2439 jio_fprintf(defaultStream::error_stream(), 2440 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 2441 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 2442 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 2443 status = false; 2444 } 2445 2446 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); 2447 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength"); 2448 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize"); 2449 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt"); 2450 2451 2452 int min_number_of_compiler_threads = get_min_number_of_compiler_threads(); 2453 // The default CICompilerCount's value is CI_COMPILER_COUNT. 2454 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number"); 2455 // Check the minimum number of compiler threads 2456 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount"); 2457 2458 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2459 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2460 } 2461 2462 return status; 2463 } 2464 2465 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2466 const char* option_type) { 2467 if (ignore) return false; 2468 2469 const char* spacer = " "; 2470 if (option_type == NULL) { 2471 option_type = ++spacer; // Set both to the empty string. 2472 } 2473 2474 if (os::obsolete_option(option)) { 2475 jio_fprintf(defaultStream::error_stream(), 2476 "Obsolete %s%soption: %s\n", option_type, spacer, 2477 option->optionString); 2478 return false; 2479 } else { 2480 jio_fprintf(defaultStream::error_stream(), 2481 "Unrecognized %s%soption: %s\n", option_type, spacer, 2482 option->optionString); 2483 return true; 2484 } 2485 } 2486 2487 static const char* user_assertion_options[] = { 2488 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2489 }; 2490 2491 static const char* system_assertion_options[] = { 2492 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2493 }; 2494 2495 bool Arguments::parse_uintx(const char* value, 2496 uintx* uintx_arg, 2497 uintx min_size) { 2498 2499 // Check the sign first since atomull() parses only unsigned values. 2500 bool value_is_positive = !(*value == '-'); 2501 2502 if (value_is_positive) { 2503 julong n; 2504 bool good_return = atomull(value, &n); 2505 if (good_return) { 2506 bool above_minimum = n >= min_size; 2507 bool value_is_too_large = n > max_uintx; 2508 2509 if (above_minimum && !value_is_too_large) { 2510 *uintx_arg = n; 2511 return true; 2512 } 2513 } 2514 } 2515 return false; 2516 } 2517 2518 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2519 julong* long_arg, 2520 julong min_size) { 2521 if (!atomull(s, long_arg)) return arg_unreadable; 2522 return check_memory_size(*long_arg, min_size); 2523 } 2524 2525 // Parse JavaVMInitArgs structure 2526 2527 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2528 // For components of the system classpath. 2529 SysClassPath scp(Arguments::get_sysclasspath()); 2530 bool scp_assembly_required = false; 2531 2532 // Save default settings for some mode flags 2533 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2534 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2535 Arguments::_ClipInlining = ClipInlining; 2536 Arguments::_BackgroundCompilation = BackgroundCompilation; 2537 if (TieredCompilation) { 2538 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2539 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2540 } 2541 2542 // Setup flags for mixed which is the default 2543 set_mode_flags(_mixed); 2544 2545 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2546 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2547 if (result != JNI_OK) { 2548 return result; 2549 } 2550 2551 // Parse JavaVMInitArgs structure passed in 2552 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE); 2553 if (result != JNI_OK) { 2554 return result; 2555 } 2556 2557 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2558 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2559 if (result != JNI_OK) { 2560 return result; 2561 } 2562 2563 // Do final processing now that all arguments have been parsed 2564 result = finalize_vm_init_args(&scp, scp_assembly_required); 2565 if (result != JNI_OK) { 2566 return result; 2567 } 2568 2569 return JNI_OK; 2570 } 2571 2572 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2573 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2574 // are dealing with -agentpath (case where name is a path), otherwise with 2575 // -agentlib 2576 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2577 char *_name; 2578 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2579 size_t _len_hprof, _len_jdwp, _len_prefix; 2580 2581 if (is_path) { 2582 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2583 return false; 2584 } 2585 2586 _name++; // skip past last path separator 2587 _len_prefix = strlen(JNI_LIB_PREFIX); 2588 2589 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2590 return false; 2591 } 2592 2593 _name += _len_prefix; 2594 _len_hprof = strlen(_hprof); 2595 _len_jdwp = strlen(_jdwp); 2596 2597 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2598 _name += _len_hprof; 2599 } 2600 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2601 _name += _len_jdwp; 2602 } 2603 else { 2604 return false; 2605 } 2606 2607 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2608 return false; 2609 } 2610 2611 return true; 2612 } 2613 2614 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2615 return true; 2616 } 2617 2618 return false; 2619 } 2620 2621 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2622 SysClassPath* scp_p, 2623 bool* scp_assembly_required_p, 2624 Flag::Flags origin) { 2625 // Remaining part of option string 2626 const char* tail; 2627 2628 // iterate over arguments 2629 for (int index = 0; index < args->nOptions; index++) { 2630 bool is_absolute_path = false; // for -agentpath vs -agentlib 2631 2632 const JavaVMOption* option = args->options + index; 2633 2634 if (!match_option(option, "-Djava.class.path", &tail) && 2635 !match_option(option, "-Dsun.java.command", &tail) && 2636 !match_option(option, "-Dsun.java.launcher", &tail)) { 2637 2638 // add all jvm options to the jvm_args string. This string 2639 // is used later to set the java.vm.args PerfData string constant. 2640 // the -Djava.class.path and the -Dsun.java.command options are 2641 // omitted from jvm_args string as each have their own PerfData 2642 // string constant object. 2643 build_jvm_args(option->optionString); 2644 } 2645 2646 // -verbose:[class/gc/jni] 2647 if (match_option(option, "-verbose", &tail)) { 2648 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2649 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2650 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2651 } else if (!strcmp(tail, ":gc")) { 2652 FLAG_SET_CMDLINE(bool, PrintGC, true); 2653 } else if (!strcmp(tail, ":jni")) { 2654 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2655 } 2656 // -da / -ea / -disableassertions / -enableassertions 2657 // These accept an optional class/package name separated by a colon, e.g., 2658 // -da:java.lang.Thread. 2659 } else if (match_option(option, user_assertion_options, &tail, true)) { 2660 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2661 if (*tail == '\0') { 2662 JavaAssertions::setUserClassDefault(enable); 2663 } else { 2664 assert(*tail == ':', "bogus match by match_option()"); 2665 JavaAssertions::addOption(tail + 1, enable); 2666 } 2667 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2668 } else if (match_option(option, system_assertion_options, &tail, false)) { 2669 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2670 JavaAssertions::setSystemClassDefault(enable); 2671 // -bootclasspath: 2672 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2673 scp_p->reset_path(tail); 2674 *scp_assembly_required_p = true; 2675 // -bootclasspath/a: 2676 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2677 scp_p->add_suffix(tail); 2678 *scp_assembly_required_p = true; 2679 // -bootclasspath/p: 2680 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2681 scp_p->add_prefix(tail); 2682 *scp_assembly_required_p = true; 2683 // -Xrun 2684 } else if (match_option(option, "-Xrun", &tail)) { 2685 if (tail != NULL) { 2686 const char* pos = strchr(tail, ':'); 2687 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2688 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2689 name[len] = '\0'; 2690 2691 char *options = NULL; 2692 if(pos != NULL) { 2693 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2694 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2695 } 2696 #if !INCLUDE_JVMTI 2697 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2698 jio_fprintf(defaultStream::error_stream(), 2699 "Profiling and debugging agents are not supported in this VM\n"); 2700 return JNI_ERR; 2701 } 2702 #endif // !INCLUDE_JVMTI 2703 add_init_library(name, options); 2704 } 2705 // -agentlib and -agentpath 2706 } else if (match_option(option, "-agentlib:", &tail) || 2707 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2708 if(tail != NULL) { 2709 const char* pos = strchr(tail, '='); 2710 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2711 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2712 name[len] = '\0'; 2713 2714 char *options = NULL; 2715 if(pos != NULL) { 2716 options = os::strdup_check_oom(pos + 1, mtInternal); 2717 } 2718 #if !INCLUDE_JVMTI 2719 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2720 jio_fprintf(defaultStream::error_stream(), 2721 "Profiling and debugging agents are not supported in this VM\n"); 2722 return JNI_ERR; 2723 } 2724 #endif // !INCLUDE_JVMTI 2725 add_init_agent(name, options, is_absolute_path); 2726 } 2727 // -javaagent 2728 } else if (match_option(option, "-javaagent:", &tail)) { 2729 #if !INCLUDE_JVMTI 2730 jio_fprintf(defaultStream::error_stream(), 2731 "Instrumentation agents are not supported in this VM\n"); 2732 return JNI_ERR; 2733 #else 2734 if(tail != NULL) { 2735 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2736 add_init_agent("instrument", options, false); 2737 } 2738 #endif // !INCLUDE_JVMTI 2739 // -Xnoclassgc 2740 } else if (match_option(option, "-Xnoclassgc")) { 2741 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2742 // -Xconcgc 2743 } else if (match_option(option, "-Xconcgc")) { 2744 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2745 // -Xnoconcgc 2746 } else if (match_option(option, "-Xnoconcgc")) { 2747 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2748 // -Xbatch 2749 } else if (match_option(option, "-Xbatch")) { 2750 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2751 // -Xmn for compatibility with other JVM vendors 2752 } else if (match_option(option, "-Xmn", &tail)) { 2753 julong long_initial_young_size = 0; 2754 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2755 if (errcode != arg_in_range) { 2756 jio_fprintf(defaultStream::error_stream(), 2757 "Invalid initial young generation size: %s\n", option->optionString); 2758 describe_range_error(errcode); 2759 return JNI_EINVAL; 2760 } 2761 FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size); 2762 FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size); 2763 // -Xms 2764 } else if (match_option(option, "-Xms", &tail)) { 2765 julong long_initial_heap_size = 0; 2766 // an initial heap size of 0 means automatically determine 2767 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2768 if (errcode != arg_in_range) { 2769 jio_fprintf(defaultStream::error_stream(), 2770 "Invalid initial heap size: %s\n", option->optionString); 2771 describe_range_error(errcode); 2772 return JNI_EINVAL; 2773 } 2774 set_min_heap_size((size_t)long_initial_heap_size); 2775 // Currently the minimum size and the initial heap sizes are the same. 2776 // Can be overridden with -XX:InitialHeapSize. 2777 FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size); 2778 // -Xmx 2779 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2780 julong long_max_heap_size = 0; 2781 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2782 if (errcode != arg_in_range) { 2783 jio_fprintf(defaultStream::error_stream(), 2784 "Invalid maximum heap size: %s\n", option->optionString); 2785 describe_range_error(errcode); 2786 return JNI_EINVAL; 2787 } 2788 FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size); 2789 // Xmaxf 2790 } else if (match_option(option, "-Xmaxf", &tail)) { 2791 char* err; 2792 int maxf = (int)(strtod(tail, &err) * 100); 2793 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) { 2794 jio_fprintf(defaultStream::error_stream(), 2795 "Bad max heap free percentage size: %s\n", 2796 option->optionString); 2797 return JNI_EINVAL; 2798 } else { 2799 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2800 } 2801 // Xminf 2802 } else if (match_option(option, "-Xminf", &tail)) { 2803 char* err; 2804 int minf = (int)(strtod(tail, &err) * 100); 2805 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) { 2806 jio_fprintf(defaultStream::error_stream(), 2807 "Bad min heap free percentage size: %s\n", 2808 option->optionString); 2809 return JNI_EINVAL; 2810 } else { 2811 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2812 } 2813 // -Xss 2814 } else if (match_option(option, "-Xss", &tail)) { 2815 julong long_ThreadStackSize = 0; 2816 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2817 if (errcode != arg_in_range) { 2818 jio_fprintf(defaultStream::error_stream(), 2819 "Invalid thread stack size: %s\n", option->optionString); 2820 describe_range_error(errcode); 2821 return JNI_EINVAL; 2822 } 2823 // Internally track ThreadStackSize in units of 1024 bytes. 2824 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2825 round_to((int)long_ThreadStackSize, K) / K); 2826 // -Xoss 2827 } else if (match_option(option, "-Xoss", &tail)) { 2828 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2829 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2830 julong long_CodeCacheExpansionSize = 0; 2831 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2832 if (errcode != arg_in_range) { 2833 jio_fprintf(defaultStream::error_stream(), 2834 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2835 os::vm_page_size()/K); 2836 return JNI_EINVAL; 2837 } 2838 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2839 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2840 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2841 julong long_ReservedCodeCacheSize = 0; 2842 2843 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2844 if (errcode != arg_in_range) { 2845 jio_fprintf(defaultStream::error_stream(), 2846 "Invalid maximum code cache size: %s.\n", option->optionString); 2847 return JNI_EINVAL; 2848 } 2849 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2850 // -XX:NonNMethodCodeHeapSize= 2851 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 2852 julong long_NonNMethodCodeHeapSize = 0; 2853 2854 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 2855 if (errcode != arg_in_range) { 2856 jio_fprintf(defaultStream::error_stream(), 2857 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 2858 return JNI_EINVAL; 2859 } 2860 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize); 2861 // -XX:ProfiledCodeHeapSize= 2862 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 2863 julong long_ProfiledCodeHeapSize = 0; 2864 2865 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 2866 if (errcode != arg_in_range) { 2867 jio_fprintf(defaultStream::error_stream(), 2868 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 2869 return JNI_EINVAL; 2870 } 2871 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize); 2872 // -XX:NonProfiledCodeHeapSizee= 2873 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 2874 julong long_NonProfiledCodeHeapSize = 0; 2875 2876 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 2877 if (errcode != arg_in_range) { 2878 jio_fprintf(defaultStream::error_stream(), 2879 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 2880 return JNI_EINVAL; 2881 } 2882 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize); 2883 //-XX:IncreaseFirstTierCompileThresholdAt= 2884 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2885 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2886 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2887 jio_fprintf(defaultStream::error_stream(), 2888 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2889 option->optionString); 2890 return JNI_EINVAL; 2891 } 2892 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2893 // -green 2894 } else if (match_option(option, "-green")) { 2895 jio_fprintf(defaultStream::error_stream(), 2896 "Green threads support not available\n"); 2897 return JNI_EINVAL; 2898 // -native 2899 } else if (match_option(option, "-native")) { 2900 // HotSpot always uses native threads, ignore silently for compatibility 2901 // -Xsqnopause 2902 } else if (match_option(option, "-Xsqnopause")) { 2903 // EVM option, ignore silently for compatibility 2904 // -Xrs 2905 } else if (match_option(option, "-Xrs")) { 2906 // Classic/EVM option, new functionality 2907 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2908 } else if (match_option(option, "-Xusealtsigs")) { 2909 // change default internal VM signals used - lower case for back compat 2910 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2911 // -Xoptimize 2912 } else if (match_option(option, "-Xoptimize")) { 2913 // EVM option, ignore silently for compatibility 2914 // -Xprof 2915 } else if (match_option(option, "-Xprof")) { 2916 #if INCLUDE_FPROF 2917 _has_profile = true; 2918 #else // INCLUDE_FPROF 2919 jio_fprintf(defaultStream::error_stream(), 2920 "Flat profiling is not supported in this VM.\n"); 2921 return JNI_ERR; 2922 #endif // INCLUDE_FPROF 2923 // -Xconcurrentio 2924 } else if (match_option(option, "-Xconcurrentio")) { 2925 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2926 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2927 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2928 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2929 FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2930 2931 // -Xinternalversion 2932 } else if (match_option(option, "-Xinternalversion")) { 2933 jio_fprintf(defaultStream::output_stream(), "%s\n", 2934 VM_Version::internal_vm_info_string()); 2935 vm_exit(0); 2936 #ifndef PRODUCT 2937 // -Xprintflags 2938 } else if (match_option(option, "-Xprintflags")) { 2939 CommandLineFlags::printFlags(tty, false); 2940 vm_exit(0); 2941 #endif 2942 // -D 2943 } else if (match_option(option, "-D", &tail)) { 2944 const char* value; 2945 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2946 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2947 // abort if -Djava.endorsed.dirs is set 2948 jio_fprintf(defaultStream::output_stream(), 2949 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2950 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2951 return JNI_EINVAL; 2952 } 2953 if (match_option(option, "-Djava.ext.dirs=", &value) && 2954 *value != '\0' && strcmp(value, "\"\"") != 0) { 2955 // abort if -Djava.ext.dirs is set 2956 jio_fprintf(defaultStream::output_stream(), 2957 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2958 return JNI_EINVAL; 2959 } 2960 2961 if (!add_property(tail)) { 2962 return JNI_ENOMEM; 2963 } 2964 // Out of the box management support 2965 if (match_option(option, "-Dcom.sun.management", &tail)) { 2966 #if INCLUDE_MANAGEMENT 2967 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2968 #else 2969 jio_fprintf(defaultStream::output_stream(), 2970 "-Dcom.sun.management is not supported in this VM.\n"); 2971 return JNI_ERR; 2972 #endif 2973 } 2974 // -Xint 2975 } else if (match_option(option, "-Xint")) { 2976 set_mode_flags(_int); 2977 // -Xmixed 2978 } else if (match_option(option, "-Xmixed")) { 2979 set_mode_flags(_mixed); 2980 // -Xcomp 2981 } else if (match_option(option, "-Xcomp")) { 2982 // for testing the compiler; turn off all flags that inhibit compilation 2983 set_mode_flags(_comp); 2984 // -Xshare:dump 2985 } else if (match_option(option, "-Xshare:dump")) { 2986 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2987 set_mode_flags(_int); // Prevent compilation, which creates objects 2988 // -Xshare:on 2989 } else if (match_option(option, "-Xshare:on")) { 2990 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2991 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2992 // -Xshare:auto 2993 } else if (match_option(option, "-Xshare:auto")) { 2994 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2995 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2996 // -Xshare:off 2997 } else if (match_option(option, "-Xshare:off")) { 2998 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2999 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3000 // -Xverify 3001 } else if (match_option(option, "-Xverify", &tail)) { 3002 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3003 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 3004 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3005 } else if (strcmp(tail, ":remote") == 0) { 3006 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3007 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3008 } else if (strcmp(tail, ":none") == 0) { 3009 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3010 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 3011 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3012 return JNI_EINVAL; 3013 } 3014 // -Xdebug 3015 } else if (match_option(option, "-Xdebug")) { 3016 // note this flag has been used, then ignore 3017 set_xdebug_mode(true); 3018 // -Xnoagent 3019 } else if (match_option(option, "-Xnoagent")) { 3020 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3021 } else if (match_option(option, "-Xboundthreads")) { 3022 // Ignore silently for compatibility 3023 } else if (match_option(option, "-Xloggc:", &tail)) { 3024 // Redirect GC output to the file. -Xloggc:<filename> 3025 // ostream_init_log(), when called will use this filename 3026 // to initialize a fileStream. 3027 _gc_log_filename = os::strdup_check_oom(tail); 3028 if (!is_filename_valid(_gc_log_filename)) { 3029 jio_fprintf(defaultStream::output_stream(), 3030 "Invalid file name for use with -Xloggc: Filename can only contain the " 3031 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 3032 "Note %%p or %%t can only be used once\n", _gc_log_filename); 3033 return JNI_EINVAL; 3034 } 3035 FLAG_SET_CMDLINE(bool, PrintGC, true); 3036 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 3037 3038 // JNI hooks 3039 } else if (match_option(option, "-Xcheck", &tail)) { 3040 if (!strcmp(tail, ":jni")) { 3041 #if !INCLUDE_JNI_CHECK 3042 warning("JNI CHECKING is not supported in this VM"); 3043 #else 3044 CheckJNICalls = true; 3045 #endif // INCLUDE_JNI_CHECK 3046 } else if (is_bad_option(option, args->ignoreUnrecognized, 3047 "check")) { 3048 return JNI_EINVAL; 3049 } 3050 } else if (match_option(option, "vfprintf")) { 3051 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3052 } else if (match_option(option, "exit")) { 3053 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3054 } else if (match_option(option, "abort")) { 3055 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3056 // -XX:+AggressiveHeap 3057 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3058 3059 // This option inspects the machine and attempts to set various 3060 // parameters to be optimal for long-running, memory allocation 3061 // intensive jobs. It is intended for machines with large 3062 // amounts of cpu and memory. 3063 3064 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 3065 // VM, but we may not be able to represent the total physical memory 3066 // available (like having 8gb of memory on a box but using a 32bit VM). 3067 // Thus, we need to make sure we're using a julong for intermediate 3068 // calculations. 3069 julong initHeapSize; 3070 julong total_memory = os::physical_memory(); 3071 3072 if (total_memory < (julong)256*M) { 3073 jio_fprintf(defaultStream::error_stream(), 3074 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 3075 vm_exit(1); 3076 } 3077 3078 // The heap size is half of available memory, or (at most) 3079 // all of possible memory less 160mb (leaving room for the OS 3080 // when using ISM). This is the maximum; because adaptive sizing 3081 // is turned on below, the actual space used may be smaller. 3082 3083 initHeapSize = MIN2(total_memory / (julong)2, 3084 total_memory - (julong)160*M); 3085 3086 initHeapSize = limit_by_allocatable_memory(initHeapSize); 3087 3088 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 3089 FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize); 3090 FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize); 3091 // Currently the minimum size and the initial heap sizes are the same. 3092 set_min_heap_size(initHeapSize); 3093 } 3094 if (FLAG_IS_DEFAULT(NewSize)) { 3095 // Make the young generation 3/8ths of the total heap. 3096 FLAG_SET_CMDLINE(size_t, NewSize, 3097 ((julong)MaxHeapSize / (julong)8) * (julong)3); 3098 FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize); 3099 } 3100 3101 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 3102 FLAG_SET_DEFAULT(UseLargePages, true); 3103 #endif 3104 3105 // Increase some data structure sizes for efficiency 3106 FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize); 3107 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3108 FLAG_SET_CMDLINE(size_t, TLABSize, 256*K); 3109 3110 // See the OldPLABSize comment below, but replace 'after promotion' 3111 // with 'after copying'. YoungPLABSize is the size of the survivor 3112 // space per-gc-thread buffers. The default is 4kw. 3113 FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256*K); // Note: this is in words 3114 3115 // OldPLABSize is the size of the buffers in the old gen that 3116 // UseParallelGC uses to promote live data that doesn't fit in the 3117 // survivor spaces. At any given time, there's one for each gc thread. 3118 // The default size is 1kw. These buffers are rarely used, since the 3119 // survivor spaces are usually big enough. For specjbb, however, there 3120 // are occasions when there's lots of live data in the young gen 3121 // and we end up promoting some of it. We don't have a definite 3122 // explanation for why bumping OldPLABSize helps, but the theory 3123 // is that a bigger PLAB results in retaining something like the 3124 // original allocation order after promotion, which improves mutator 3125 // locality. A minor effect may be that larger PLABs reduce the 3126 // number of PLAB allocation events during gc. The value of 8kw 3127 // was arrived at by experimenting with specjbb. 3128 FLAG_SET_CMDLINE(size_t, OldPLABSize, 8*K); // Note: this is in words 3129 3130 // Enable parallel GC and adaptive generation sizing 3131 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 3132 FLAG_SET_DEFAULT(ParallelGCThreads, 3133 Abstract_VM_Version::parallel_worker_threads()); 3134 3135 // Encourage steady state memory management 3136 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 3137 3138 // This appears to improve mutator locality 3139 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3140 3141 // Get around early Solaris scheduling bug 3142 // (affinity vs other jobs on system) 3143 // but disallow DR and offlining (5008695). 3144 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 3145 3146 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3147 // and the last option wins. 3148 } else if (match_option(option, "-XX:+NeverTenure")) { 3149 FLAG_SET_CMDLINE(bool, NeverTenure, true); 3150 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3151 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1); 3152 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3153 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3154 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3155 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 3156 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3157 uintx max_tenuring_thresh = 0; 3158 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3159 jio_fprintf(defaultStream::error_stream(), 3160 "Improperly specified VM option 'MaxTenuringThreshold=%s'\n", tail); 3161 return JNI_EINVAL; 3162 } 3163 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh); 3164 3165 if (MaxTenuringThreshold == 0) { 3166 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3167 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3168 } else { 3169 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3170 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3171 } 3172 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3173 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3174 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3175 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3176 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3177 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3178 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3179 #if defined(DTRACE_ENABLED) 3180 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3181 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3182 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3183 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3184 #else // defined(DTRACE_ENABLED) 3185 jio_fprintf(defaultStream::error_stream(), 3186 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3187 return JNI_EINVAL; 3188 #endif // defined(DTRACE_ENABLED) 3189 #ifdef ASSERT 3190 } else if (match_option(option, "-XX:+FullGCALot")) { 3191 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3192 // disable scavenge before parallel mark-compact 3193 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3194 #endif 3195 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3196 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3197 julong stack_size = 0; 3198 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3199 if (errcode != arg_in_range) { 3200 jio_fprintf(defaultStream::error_stream(), 3201 "Invalid mark stack size: %s\n", option->optionString); 3202 describe_range_error(errcode); 3203 return JNI_EINVAL; 3204 } 3205 jio_fprintf(defaultStream::error_stream(), 3206 "Please use -XX:MarkStackSize in place of " 3207 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n"); 3208 FLAG_SET_CMDLINE(size_t, MarkStackSize, stack_size); 3209 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3210 julong max_stack_size = 0; 3211 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3212 if (errcode != arg_in_range) { 3213 jio_fprintf(defaultStream::error_stream(), 3214 "Invalid maximum mark stack size: %s\n", 3215 option->optionString); 3216 describe_range_error(errcode); 3217 return JNI_EINVAL; 3218 } 3219 jio_fprintf(defaultStream::error_stream(), 3220 "Please use -XX:MarkStackSizeMax in place of " 3221 "-XX:CMSMarkStackSizeMax in the future\n"); 3222 FLAG_SET_CMDLINE(size_t, MarkStackSizeMax, max_stack_size); 3223 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3224 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3225 uintx conc_threads = 0; 3226 if (!parse_uintx(tail, &conc_threads, 1)) { 3227 jio_fprintf(defaultStream::error_stream(), 3228 "Invalid concurrent threads: %s\n", option->optionString); 3229 return JNI_EINVAL; 3230 } 3231 jio_fprintf(defaultStream::error_stream(), 3232 "Please use -XX:ConcGCThreads in place of " 3233 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n"); 3234 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3235 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3236 julong max_direct_memory_size = 0; 3237 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3238 if (errcode != arg_in_range) { 3239 jio_fprintf(defaultStream::error_stream(), 3240 "Invalid maximum direct memory size: %s\n", 3241 option->optionString); 3242 describe_range_error(errcode); 3243 return JNI_EINVAL; 3244 } 3245 FLAG_SET_CMDLINE(size_t, MaxDirectMemorySize, max_direct_memory_size); 3246 #if !INCLUDE_MANAGEMENT 3247 } else if (match_option(option, "-XX:+ManagementServer")) { 3248 jio_fprintf(defaultStream::error_stream(), 3249 "ManagementServer is not supported in this VM.\n"); 3250 return JNI_ERR; 3251 #endif // INCLUDE_MANAGEMENT 3252 // CreateMinidumpOnCrash is removed, and replaced by CreateCoredumpOnCrash 3253 } else if (match_option(option, "-XX:+CreateMinidumpOnCrash")) { 3254 FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, true); 3255 jio_fprintf(defaultStream::output_stream(), 3256 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is on\n"); 3257 } else if (match_option(option, "-XX:-CreateMinidumpOnCrash")) { 3258 FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, false); 3259 jio_fprintf(defaultStream::output_stream(), 3260 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is off\n"); 3261 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3262 // Skip -XX:Flags= since that case has already been handled 3263 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3264 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3265 return JNI_EINVAL; 3266 } 3267 } 3268 // Unknown option 3269 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3270 return JNI_ERR; 3271 } 3272 } 3273 3274 // PrintSharedArchiveAndExit will turn on 3275 // -Xshare:on 3276 // -XX:+TraceClassPaths 3277 if (PrintSharedArchiveAndExit) { 3278 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3279 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3280 FLAG_SET_CMDLINE(bool, TraceClassPaths, true); 3281 } 3282 3283 // Change the default value for flags which have different default values 3284 // when working with older JDKs. 3285 #ifdef LINUX 3286 if (JDK_Version::current().compare_major(6) <= 0 && 3287 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3288 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3289 } 3290 #endif // LINUX 3291 fix_appclasspath(); 3292 return JNI_OK; 3293 } 3294 3295 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3296 // 3297 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3298 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3299 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3300 // path is treated as the current directory. 3301 // 3302 // This causes problems with CDS, which requires that all directories specified in the classpath 3303 // must be empty. In most cases, applications do NOT want to load classes from the current 3304 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3305 // scripts compatible with CDS. 3306 void Arguments::fix_appclasspath() { 3307 if (IgnoreEmptyClassPaths) { 3308 const char separator = *os::path_separator(); 3309 const char* src = _java_class_path->value(); 3310 3311 // skip over all the leading empty paths 3312 while (*src == separator) { 3313 src ++; 3314 } 3315 3316 char* copy = os::strdup_check_oom(src, mtInternal); 3317 3318 // trim all trailing empty paths 3319 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3320 *tail = '\0'; 3321 } 3322 3323 char from[3] = {separator, separator, '\0'}; 3324 char to [2] = {separator, '\0'}; 3325 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3326 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3327 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3328 } 3329 3330 _java_class_path->set_value(copy); 3331 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3332 } 3333 3334 if (!PrintSharedArchiveAndExit) { 3335 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value()); 3336 } 3337 } 3338 3339 static bool has_jar_files(const char* directory) { 3340 DIR* dir = os::opendir(directory); 3341 if (dir == NULL) return false; 3342 3343 struct dirent *entry; 3344 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 3345 bool hasJarFile = false; 3346 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3347 const char* name = entry->d_name; 3348 const char* ext = name + strlen(name) - 4; 3349 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3350 } 3351 FREE_C_HEAP_ARRAY(char, dbuf); 3352 os::closedir(dir); 3353 return hasJarFile ; 3354 } 3355 3356 static int check_non_empty_dirs(const char* path) { 3357 const char separator = *os::path_separator(); 3358 const char* const end = path + strlen(path); 3359 int nonEmptyDirs = 0; 3360 while (path < end) { 3361 const char* tmp_end = strchr(path, separator); 3362 if (tmp_end == NULL) { 3363 if (has_jar_files(path)) { 3364 nonEmptyDirs++; 3365 jio_fprintf(defaultStream::output_stream(), 3366 "Non-empty directory: %s\n", path); 3367 } 3368 path = end; 3369 } else { 3370 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 3371 memcpy(dirpath, path, tmp_end - path); 3372 dirpath[tmp_end - path] = '\0'; 3373 if (has_jar_files(dirpath)) { 3374 nonEmptyDirs++; 3375 jio_fprintf(defaultStream::output_stream(), 3376 "Non-empty directory: %s\n", dirpath); 3377 } 3378 FREE_C_HEAP_ARRAY(char, dirpath); 3379 path = tmp_end + 1; 3380 } 3381 } 3382 return nonEmptyDirs; 3383 } 3384 3385 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3386 // check if the default lib/endorsed directory exists; if so, error 3387 char path[JVM_MAXPATHLEN]; 3388 const char* fileSep = os::file_separator(); 3389 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3390 3391 if (CheckEndorsedAndExtDirs) { 3392 int nonEmptyDirs = 0; 3393 // check endorsed directory 3394 nonEmptyDirs += check_non_empty_dirs(path); 3395 // check the extension directories 3396 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3397 if (nonEmptyDirs > 0) { 3398 return JNI_ERR; 3399 } 3400 } 3401 3402 DIR* dir = os::opendir(path); 3403 if (dir != NULL) { 3404 jio_fprintf(defaultStream::output_stream(), 3405 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3406 "in modular form will be supported via the concept of upgradeable modules.\n"); 3407 os::closedir(dir); 3408 return JNI_ERR; 3409 } 3410 3411 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3412 dir = os::opendir(path); 3413 if (dir != NULL) { 3414 jio_fprintf(defaultStream::output_stream(), 3415 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3416 "Use -classpath instead.\n."); 3417 os::closedir(dir); 3418 return JNI_ERR; 3419 } 3420 3421 if (scp_assembly_required) { 3422 // Assemble the bootclasspath elements into the final path. 3423 Arguments::set_sysclasspath(scp_p->combined_path()); 3424 } 3425 3426 // This must be done after all arguments have been processed. 3427 // java_compiler() true means set to "NONE" or empty. 3428 if (java_compiler() && !xdebug_mode()) { 3429 // For backwards compatibility, we switch to interpreted mode if 3430 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3431 // not specified. 3432 set_mode_flags(_int); 3433 } 3434 3435 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3436 // but like -Xint, leave compilation thresholds unaffected. 3437 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3438 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3439 set_mode_flags(_int); 3440 } 3441 3442 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3443 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3444 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3445 } 3446 3447 #ifndef COMPILER2 3448 // Don't degrade server performance for footprint 3449 if (FLAG_IS_DEFAULT(UseLargePages) && 3450 MaxHeapSize < LargePageHeapSizeThreshold) { 3451 // No need for large granularity pages w/small heaps. 3452 // Note that large pages are enabled/disabled for both the 3453 // Java heap and the code cache. 3454 FLAG_SET_DEFAULT(UseLargePages, false); 3455 } 3456 3457 #else 3458 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3459 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3460 } 3461 #endif 3462 3463 #ifndef TIERED 3464 // Tiered compilation is undefined. 3465 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3466 #endif 3467 3468 // If we are running in a headless jre, force java.awt.headless property 3469 // to be true unless the property has already been set. 3470 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3471 if (os::is_headless_jre()) { 3472 const char* headless = Arguments::get_property("java.awt.headless"); 3473 if (headless == NULL) { 3474 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3475 if (headless_env == NULL) { 3476 if (!add_property("java.awt.headless=true")) { 3477 return JNI_ENOMEM; 3478 } 3479 } else { 3480 char buffer[256]; 3481 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env); 3482 if (!add_property(buffer)) { 3483 return JNI_ENOMEM; 3484 } 3485 } 3486 } 3487 } 3488 3489 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) { 3490 // CMS can only be used with ParNew 3491 FLAG_SET_ERGO(bool, UseParNewGC, true); 3492 } 3493 3494 if (!check_vm_args_consistency()) { 3495 return JNI_ERR; 3496 } 3497 3498 return JNI_OK; 3499 } 3500 3501 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3502 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3503 scp_assembly_required_p); 3504 } 3505 3506 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3507 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3508 scp_assembly_required_p); 3509 } 3510 3511 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3512 char *buffer = ::getenv(name); 3513 3514 // Don't check this variable if user has special privileges 3515 // (e.g. unix su command). 3516 if (buffer == NULL || os::have_special_privileges()) { 3517 return JNI_OK; 3518 } 3519 3520 if ((buffer = os::strdup(buffer)) == NULL) { 3521 return JNI_ENOMEM; 3522 } 3523 3524 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array 3525 jio_fprintf(defaultStream::error_stream(), 3526 "Picked up %s: %s\n", name, buffer); 3527 char* rd = buffer; // pointer to the input string (rd) 3528 while (true) { // repeat for all options in the input string 3529 while (isspace(*rd)) rd++; // skip whitespace 3530 if (*rd == 0) break; // we re done when the input string is read completely 3531 3532 // The output, option string, overwrites the input string. 3533 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3534 // input string (rd). 3535 char* wrt = rd; 3536 3537 JavaVMOption option; 3538 option.optionString = wrt; 3539 options->append(option); // Fill in option 3540 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3541 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3542 int quote = *rd; // matching quote to look for 3543 rd++; // don't copy open quote 3544 while (*rd != quote) { // include everything (even spaces) up until quote 3545 if (*rd == 0) { // string termination means unmatched string 3546 jio_fprintf(defaultStream::error_stream(), 3547 "Unmatched quote in %s\n", name); 3548 delete options; 3549 os::free(buffer); 3550 return JNI_ERR; 3551 } 3552 *wrt++ = *rd++; // copy to option string 3553 } 3554 rd++; // don't copy close quote 3555 } else { 3556 *wrt++ = *rd++; // copy to option string 3557 } 3558 } 3559 // Need to check if we're done before writing a NULL, 3560 // because the write could be to the byte that rd is pointing to. 3561 if (*rd++ == 0) { 3562 *wrt = 0; 3563 break; 3564 } 3565 *wrt = 0; // Zero terminate option 3566 } 3567 JavaVMOption* options_arr = 3568 NEW_C_HEAP_ARRAY_RETURN_NULL(JavaVMOption, options->length(), mtInternal); 3569 if (options_arr == NULL) { 3570 delete options; 3571 os::free(buffer); 3572 return JNI_ENOMEM; 3573 } 3574 for (int i = 0; i < options->length(); i++) { 3575 options_arr[i] = options->at(i); 3576 } 3577 3578 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3579 JavaVMInitArgs vm_args; 3580 vm_args.version = JNI_VERSION_1_2; 3581 vm_args.options = options_arr; 3582 vm_args.nOptions = options->length(); 3583 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3584 3585 if (PrintVMOptions) { 3586 const char* tail; 3587 for (int i = 0; i < vm_args.nOptions; i++) { 3588 const JavaVMOption *option = vm_args.options + i; 3589 if (match_option(option, "-XX:", &tail)) { 3590 logOption(tail); 3591 } 3592 } 3593 } 3594 3595 jint result = parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, 3596 Flag::ENVIRON_VAR); 3597 FREE_C_HEAP_ARRAY(JavaVMOption, options_arr); 3598 delete options; 3599 os::free(buffer); 3600 return result; 3601 } 3602 3603 void Arguments::set_shared_spaces_flags() { 3604 if (DumpSharedSpaces) { 3605 if (RequireSharedSpaces) { 3606 warning("cannot dump shared archive while using shared archive"); 3607 } 3608 UseSharedSpaces = false; 3609 #ifdef _LP64 3610 if (!UseCompressedOops || !UseCompressedClassPointers) { 3611 vm_exit_during_initialization( 3612 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3613 } 3614 } else { 3615 if (!UseCompressedOops || !UseCompressedClassPointers) { 3616 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3617 } 3618 #endif 3619 } 3620 } 3621 3622 #if !INCLUDE_ALL_GCS 3623 static void force_serial_gc() { 3624 FLAG_SET_DEFAULT(UseSerialGC, true); 3625 UNSUPPORTED_GC_OPTION(UseG1GC); 3626 UNSUPPORTED_GC_OPTION(UseParallelGC); 3627 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3628 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3629 UNSUPPORTED_GC_OPTION(UseParNewGC); 3630 } 3631 #endif // INCLUDE_ALL_GCS 3632 3633 // Sharing support 3634 // Construct the path to the archive 3635 static char* get_shared_archive_path() { 3636 char *shared_archive_path; 3637 if (SharedArchiveFile == NULL) { 3638 char jvm_path[JVM_MAXPATHLEN]; 3639 os::jvm_path(jvm_path, sizeof(jvm_path)); 3640 char *end = strrchr(jvm_path, *os::file_separator()); 3641 if (end != NULL) *end = '\0'; 3642 size_t jvm_path_len = strlen(jvm_path); 3643 size_t file_sep_len = strlen(os::file_separator()); 3644 const size_t len = jvm_path_len + file_sep_len + 20; 3645 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal); 3646 if (shared_archive_path != NULL) { 3647 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 3648 jvm_path, os::file_separator()); 3649 } 3650 } else { 3651 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal); 3652 } 3653 return shared_archive_path; 3654 } 3655 3656 #ifndef PRODUCT 3657 // Determine whether LogVMOutput should be implicitly turned on. 3658 static bool use_vm_log() { 3659 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3660 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3661 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3662 PrintAssembly || TraceDeoptimization || TraceDependencies || 3663 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3664 return true; 3665 } 3666 3667 #ifdef COMPILER1 3668 if (PrintC1Statistics) { 3669 return true; 3670 } 3671 #endif // COMPILER1 3672 3673 #ifdef COMPILER2 3674 if (PrintOptoAssembly || PrintOptoStatistics) { 3675 return true; 3676 } 3677 #endif // COMPILER2 3678 3679 return false; 3680 } 3681 #endif // PRODUCT 3682 3683 // Parse entry point called from JNI_CreateJavaVM 3684 3685 jint Arguments::parse(const JavaVMInitArgs* args) { 3686 3687 // Remaining part of option string 3688 const char* tail; 3689 3690 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3691 const char* hotspotrc = ".hotspotrc"; 3692 bool settings_file_specified = false; 3693 bool needs_hotspotrc_warning = false; 3694 3695 const char* flags_file; 3696 int index; 3697 for (index = 0; index < args->nOptions; index++) { 3698 const JavaVMOption *option = args->options + index; 3699 if (ArgumentsExt::process_options(option)) { 3700 continue; 3701 } 3702 if (match_option(option, "-XX:Flags=", &tail)) { 3703 flags_file = tail; 3704 settings_file_specified = true; 3705 continue; 3706 } 3707 if (match_option(option, "-XX:+PrintVMOptions")) { 3708 PrintVMOptions = true; 3709 continue; 3710 } 3711 if (match_option(option, "-XX:-PrintVMOptions")) { 3712 PrintVMOptions = false; 3713 continue; 3714 } 3715 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3716 IgnoreUnrecognizedVMOptions = true; 3717 continue; 3718 } 3719 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3720 IgnoreUnrecognizedVMOptions = false; 3721 continue; 3722 } 3723 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3724 CommandLineFlags::printFlags(tty, false); 3725 vm_exit(0); 3726 } 3727 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3728 #if INCLUDE_NMT 3729 // The launcher did not setup nmt environment variable properly. 3730 if (!MemTracker::check_launcher_nmt_support(tail)) { 3731 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3732 } 3733 3734 // Verify if nmt option is valid. 3735 if (MemTracker::verify_nmt_option()) { 3736 // Late initialization, still in single-threaded mode. 3737 if (MemTracker::tracking_level() >= NMT_summary) { 3738 MemTracker::init(); 3739 } 3740 } else { 3741 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3742 } 3743 continue; 3744 #else 3745 jio_fprintf(defaultStream::error_stream(), 3746 "Native Memory Tracking is not supported in this VM\n"); 3747 return JNI_ERR; 3748 #endif 3749 } 3750 3751 #ifndef PRODUCT 3752 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3753 CommandLineFlags::printFlags(tty, true); 3754 vm_exit(0); 3755 } 3756 #endif 3757 } 3758 3759 if (IgnoreUnrecognizedVMOptions) { 3760 // uncast const to modify the flag args->ignoreUnrecognized 3761 *(jboolean*)(&args->ignoreUnrecognized) = true; 3762 } 3763 3764 // Parse specified settings file 3765 if (settings_file_specified) { 3766 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3767 return JNI_EINVAL; 3768 } 3769 } else { 3770 #ifdef ASSERT 3771 // Parse default .hotspotrc settings file 3772 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3773 return JNI_EINVAL; 3774 } 3775 #else 3776 struct stat buf; 3777 if (os::stat(hotspotrc, &buf) == 0) { 3778 needs_hotspotrc_warning = true; 3779 } 3780 #endif 3781 } 3782 3783 if (PrintVMOptions) { 3784 for (index = 0; index < args->nOptions; index++) { 3785 const JavaVMOption *option = args->options + index; 3786 if (match_option(option, "-XX:", &tail)) { 3787 logOption(tail); 3788 } 3789 } 3790 } 3791 3792 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3793 jint result = parse_vm_init_args(args); 3794 if (result != JNI_OK) { 3795 return result; 3796 } 3797 3798 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3799 SharedArchivePath = get_shared_archive_path(); 3800 if (SharedArchivePath == NULL) { 3801 return JNI_ENOMEM; 3802 } 3803 3804 // Set up VerifySharedSpaces 3805 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 3806 VerifySharedSpaces = true; 3807 } 3808 3809 // Delay warning until here so that we've had a chance to process 3810 // the -XX:-PrintWarnings flag 3811 if (needs_hotspotrc_warning) { 3812 warning("%s file is present but has been ignored. " 3813 "Run with -XX:Flags=%s to load the file.", 3814 hotspotrc, hotspotrc); 3815 } 3816 3817 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 3818 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3819 #endif 3820 3821 ArgumentsExt::report_unsupported_options(); 3822 3823 #ifndef PRODUCT 3824 if (TraceBytecodesAt != 0) { 3825 TraceBytecodes = true; 3826 } 3827 if (CountCompiledCalls) { 3828 if (UseCounterDecay) { 3829 warning("UseCounterDecay disabled because CountCalls is set"); 3830 UseCounterDecay = false; 3831 } 3832 } 3833 #endif // PRODUCT 3834 3835 if (ScavengeRootsInCode == 0) { 3836 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3837 warning("forcing ScavengeRootsInCode non-zero"); 3838 } 3839 ScavengeRootsInCode = 1; 3840 } 3841 3842 if (PrintGCDetails) { 3843 // Turn on -verbose:gc options as well 3844 PrintGC = true; 3845 } 3846 3847 // Set object alignment values. 3848 set_object_alignment(); 3849 3850 #if !INCLUDE_ALL_GCS 3851 force_serial_gc(); 3852 #endif // INCLUDE_ALL_GCS 3853 #if !INCLUDE_CDS 3854 if (DumpSharedSpaces || RequireSharedSpaces) { 3855 jio_fprintf(defaultStream::error_stream(), 3856 "Shared spaces are not supported in this VM\n"); 3857 return JNI_ERR; 3858 } 3859 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3860 warning("Shared spaces are not supported in this VM"); 3861 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3862 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3863 } 3864 no_shared_spaces("CDS Disabled"); 3865 #endif // INCLUDE_CDS 3866 3867 return JNI_OK; 3868 } 3869 3870 jint Arguments::apply_ergo() { 3871 3872 // Set flags based on ergonomics. 3873 set_ergonomics_flags(); 3874 3875 set_shared_spaces_flags(); 3876 3877 // Check the GC selections again. 3878 if (!check_gc_consistency()) { 3879 return JNI_EINVAL; 3880 } 3881 3882 if (TieredCompilation) { 3883 set_tiered_flags(); 3884 } else { 3885 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3886 if (CompilationPolicyChoice >= 2) { 3887 vm_exit_during_initialization( 3888 "Incompatible compilation policy selected", NULL); 3889 } 3890 // Scale CompileThreshold 3891 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 3892 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 3893 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 3894 } 3895 } 3896 3897 #ifdef COMPILER2 3898 #ifndef PRODUCT 3899 if (PrintIdealGraphLevel > 0) { 3900 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 3901 } 3902 #endif 3903 #endif 3904 3905 // Set heap size based on available physical memory 3906 set_heap_size(); 3907 3908 ArgumentsExt::set_gc_specific_flags(); 3909 3910 // Initialize Metaspace flags and alignments 3911 Metaspace::ergo_initialize(); 3912 3913 // Set bytecode rewriting flags 3914 set_bytecode_flags(); 3915 3916 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 3917 set_aggressive_opts_flags(); 3918 3919 // Turn off biased locking for locking debug mode flags, 3920 // which are subtly different from each other but neither works with 3921 // biased locking 3922 if (UseHeavyMonitors 3923 #ifdef COMPILER1 3924 || !UseFastLocking 3925 #endif // COMPILER1 3926 ) { 3927 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3928 // flag set to true on command line; warn the user that they 3929 // can't enable biased locking here 3930 warning("Biased Locking is not supported with locking debug flags" 3931 "; ignoring UseBiasedLocking flag." ); 3932 } 3933 UseBiasedLocking = false; 3934 } 3935 3936 #ifdef ZERO 3937 // Clear flags not supported on zero. 3938 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3939 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3940 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3941 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3942 #endif // CC_INTERP 3943 3944 #ifdef COMPILER2 3945 if (!EliminateLocks) { 3946 EliminateNestedLocks = false; 3947 } 3948 if (!Inline) { 3949 IncrementalInline = false; 3950 } 3951 #ifndef PRODUCT 3952 if (!IncrementalInline) { 3953 AlwaysIncrementalInline = false; 3954 } 3955 #endif 3956 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 3957 // nothing to use the profiling, turn if off 3958 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 3959 } 3960 #endif 3961 3962 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3963 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3964 DebugNonSafepoints = true; 3965 } 3966 3967 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3968 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3969 } 3970 3971 #ifndef PRODUCT 3972 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3973 if (use_vm_log()) { 3974 LogVMOutput = true; 3975 } 3976 } 3977 #endif // PRODUCT 3978 3979 if (PrintCommandLineFlags) { 3980 CommandLineFlags::printSetFlags(tty); 3981 } 3982 3983 // Apply CPU specific policy for the BiasedLocking 3984 if (UseBiasedLocking) { 3985 if (!VM_Version::use_biased_locking() && 3986 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3987 UseBiasedLocking = false; 3988 } 3989 } 3990 #ifdef COMPILER2 3991 if (!UseBiasedLocking || EmitSync != 0) { 3992 UseOptoBiasInlining = false; 3993 } 3994 #endif 3995 3996 return JNI_OK; 3997 } 3998 3999 jint Arguments::adjust_after_os() { 4000 if (UseNUMA) { 4001 if (UseParallelGC || UseParallelOldGC) { 4002 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4003 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4004 } 4005 } 4006 // UseNUMAInterleaving is set to ON for all collectors and 4007 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4008 // such as the parallel collector for Linux and Solaris will 4009 // interleave old gen and survivor spaces on top of NUMA 4010 // allocation policy for the eden space. 4011 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4012 // all platforms and ParallelGC on Windows will interleave all 4013 // of the heap spaces across NUMA nodes. 4014 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4015 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4016 } 4017 } 4018 return JNI_OK; 4019 } 4020 4021 int Arguments::PropertyList_count(SystemProperty* pl) { 4022 int count = 0; 4023 while(pl != NULL) { 4024 count++; 4025 pl = pl->next(); 4026 } 4027 return count; 4028 } 4029 4030 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4031 assert(key != NULL, "just checking"); 4032 SystemProperty* prop; 4033 for (prop = pl; prop != NULL; prop = prop->next()) { 4034 if (strcmp(key, prop->key()) == 0) return prop->value(); 4035 } 4036 return NULL; 4037 } 4038 4039 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4040 int count = 0; 4041 const char* ret_val = NULL; 4042 4043 while(pl != NULL) { 4044 if(count >= index) { 4045 ret_val = pl->key(); 4046 break; 4047 } 4048 count++; 4049 pl = pl->next(); 4050 } 4051 4052 return ret_val; 4053 } 4054 4055 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4056 int count = 0; 4057 char* ret_val = NULL; 4058 4059 while(pl != NULL) { 4060 if(count >= index) { 4061 ret_val = pl->value(); 4062 break; 4063 } 4064 count++; 4065 pl = pl->next(); 4066 } 4067 4068 return ret_val; 4069 } 4070 4071 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4072 SystemProperty* p = *plist; 4073 if (p == NULL) { 4074 *plist = new_p; 4075 } else { 4076 while (p->next() != NULL) { 4077 p = p->next(); 4078 } 4079 p->set_next(new_p); 4080 } 4081 } 4082 4083 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 4084 if (plist == NULL) 4085 return; 4086 4087 SystemProperty* new_p = new SystemProperty(k, v, true); 4088 PropertyList_add(plist, new_p); 4089 } 4090 4091 void Arguments::PropertyList_add(SystemProperty *element) { 4092 PropertyList_add(&_system_properties, element); 4093 } 4094 4095 // This add maintains unique property key in the list. 4096 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 4097 if (plist == NULL) 4098 return; 4099 4100 // If property key exist then update with new value. 4101 SystemProperty* prop; 4102 for (prop = *plist; prop != NULL; prop = prop->next()) { 4103 if (strcmp(k, prop->key()) == 0) { 4104 if (append) { 4105 prop->append_value(v); 4106 } else { 4107 prop->set_value(v); 4108 } 4109 return; 4110 } 4111 } 4112 4113 PropertyList_add(plist, k, v); 4114 } 4115 4116 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4117 // Returns true if all of the source pointed by src has been copied over to 4118 // the destination buffer pointed by buf. Otherwise, returns false. 4119 // Notes: 4120 // 1. If the length (buflen) of the destination buffer excluding the 4121 // NULL terminator character is not long enough for holding the expanded 4122 // pid characters, it also returns false instead of returning the partially 4123 // expanded one. 4124 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4125 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4126 char* buf, size_t buflen) { 4127 const char* p = src; 4128 char* b = buf; 4129 const char* src_end = &src[srclen]; 4130 char* buf_end = &buf[buflen - 1]; 4131 4132 while (p < src_end && b < buf_end) { 4133 if (*p == '%') { 4134 switch (*(++p)) { 4135 case '%': // "%%" ==> "%" 4136 *b++ = *p++; 4137 break; 4138 case 'p': { // "%p" ==> current process id 4139 // buf_end points to the character before the last character so 4140 // that we could write '\0' to the end of the buffer. 4141 size_t buf_sz = buf_end - b + 1; 4142 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4143 4144 // if jio_snprintf fails or the buffer is not long enough to hold 4145 // the expanded pid, returns false. 4146 if (ret < 0 || ret >= (int)buf_sz) { 4147 return false; 4148 } else { 4149 b += ret; 4150 assert(*b == '\0', "fail in copy_expand_pid"); 4151 if (p == src_end && b == buf_end + 1) { 4152 // reach the end of the buffer. 4153 return true; 4154 } 4155 } 4156 p++; 4157 break; 4158 } 4159 default : 4160 *b++ = '%'; 4161 } 4162 } else { 4163 *b++ = *p++; 4164 } 4165 } 4166 *b = '\0'; 4167 return (p == src_end); // return false if not all of the source was copied 4168 }