1 /* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoader.hpp" 27 #include "classfile/javaAssertions.hpp" 28 #include "classfile/stringTable.hpp" 29 #include "classfile/symbolTable.hpp" 30 #include "compiler/compilerOracle.hpp" 31 #include "memory/allocation.inline.hpp" 32 #include "memory/cardTableRS.hpp" 33 #include "memory/genCollectedHeap.hpp" 34 #include "memory/referenceProcessor.hpp" 35 #include "memory/universe.inline.hpp" 36 #include "oops/oop.inline.hpp" 37 #include "prims/jvmtiExport.hpp" 38 #include "runtime/arguments.hpp" 39 #include "runtime/arguments_ext.hpp" 40 #include "runtime/globals_extension.hpp" 41 #include "runtime/java.hpp" 42 #include "runtime/os.hpp" 43 #include "runtime/vm_version.hpp" 44 #include "services/management.hpp" 45 #include "services/memTracker.hpp" 46 #include "utilities/defaultStream.hpp" 47 #include "utilities/macros.hpp" 48 #include "utilities/stringUtils.hpp" 49 #include "utilities/taskqueue.hpp" 50 #if INCLUDE_ALL_GCS 51 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 52 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 53 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 54 #endif // INCLUDE_ALL_GCS 55 56 // Note: This is a special bug reporting site for the JVM 57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 58 #define DEFAULT_JAVA_LAUNCHER "generic" 59 60 #define UNSUPPORTED_GC_OPTION(gc) \ 61 do { \ 62 if (gc) { \ 63 if (FLAG_IS_CMDLINE(gc)) { \ 64 warning(#gc " is not supported in this VM. Using Serial GC."); \ 65 } \ 66 FLAG_SET_DEFAULT(gc, false); \ 67 } \ 68 } while(0) 69 70 char** Arguments::_jvm_flags_array = NULL; 71 int Arguments::_num_jvm_flags = 0; 72 char** Arguments::_jvm_args_array = NULL; 73 int Arguments::_num_jvm_args = 0; 74 char* Arguments::_java_command = NULL; 75 SystemProperty* Arguments::_system_properties = NULL; 76 const char* Arguments::_gc_log_filename = NULL; 77 bool Arguments::_has_profile = false; 78 size_t Arguments::_conservative_max_heap_alignment = 0; 79 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 96 char* Arguments::SharedArchivePath = NULL; 97 98 AgentLibraryList Arguments::_libraryList; 99 AgentLibraryList Arguments::_agentList; 100 101 abort_hook_t Arguments::_abort_hook = NULL; 102 exit_hook_t Arguments::_exit_hook = NULL; 103 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 104 105 106 SystemProperty *Arguments::_sun_boot_library_path = NULL; 107 SystemProperty *Arguments::_java_library_path = NULL; 108 SystemProperty *Arguments::_java_home = NULL; 109 SystemProperty *Arguments::_java_class_path = NULL; 110 SystemProperty *Arguments::_sun_boot_class_path = NULL; 111 112 char* Arguments::_ext_dirs = NULL; 113 114 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 115 // part of the option string. 116 static bool match_option(const JavaVMOption *option, const char* name, 117 const char** tail) { 118 int len = (int)strlen(name); 119 if (strncmp(option->optionString, name, len) == 0) { 120 *tail = option->optionString + len; 121 return true; 122 } else { 123 return false; 124 } 125 } 126 127 // Check if 'option' matches 'name'. No "tail" is allowed. 128 static bool match_option(const JavaVMOption *option, const char* name) { 129 const char* tail = NULL; 130 bool result = match_option(option, name, &tail); 131 if (tail != NULL && *tail == '\0') { 132 return result; 133 } else { 134 return false; 135 } 136 } 137 138 // Return true if any of the strings in null-terminated array 'names' matches. 139 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 140 // the option must match exactly. 141 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 142 bool tail_allowed) { 143 for (/* empty */; *names != NULL; ++names) { 144 if (match_option(option, *names, tail)) { 145 if (**tail == '\0' || tail_allowed && **tail == ':') { 146 return true; 147 } 148 } 149 } 150 return false; 151 } 152 153 static void logOption(const char* opt) { 154 if (PrintVMOptions) { 155 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 156 } 157 } 158 159 // Process java launcher properties. 160 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 161 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 162 // sun.java.launcher.pid is defined. 163 // Must do this before setting up other system properties, 164 // as some of them may depend on launcher type. 165 for (int index = 0; index < args->nOptions; index++) { 166 const JavaVMOption* option = args->options + index; 167 const char* tail; 168 169 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 170 process_java_launcher_argument(tail, option->extraInfo); 171 continue; 172 } 173 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 174 if (strcmp(tail, "true") == 0) { 175 _sun_java_launcher_is_altjvm = true; 176 } 177 continue; 178 } 179 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 180 _sun_java_launcher_pid = atoi(tail); 181 continue; 182 } 183 } 184 } 185 186 // Initialize system properties key and value. 187 void Arguments::init_system_properties() { 188 189 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 190 "Java Virtual Machine Specification", false)); 191 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 192 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 193 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 194 195 // Following are JVMTI agent writable properties. 196 // Properties values are set to NULL and they are 197 // os specific they are initialized in os::init_system_properties_values(). 198 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 199 _java_library_path = new SystemProperty("java.library.path", NULL, true); 200 _java_home = new SystemProperty("java.home", NULL, true); 201 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 202 203 _java_class_path = new SystemProperty("java.class.path", "", true); 204 205 // Add to System Property list. 206 PropertyList_add(&_system_properties, _sun_boot_library_path); 207 PropertyList_add(&_system_properties, _java_library_path); 208 PropertyList_add(&_system_properties, _java_home); 209 PropertyList_add(&_system_properties, _java_class_path); 210 PropertyList_add(&_system_properties, _sun_boot_class_path); 211 212 // Set OS specific system properties values 213 os::init_system_properties_values(); 214 } 215 216 217 // Update/Initialize System properties after JDK version number is known 218 void Arguments::init_version_specific_system_properties() { 219 enum { bufsz = 16 }; 220 char buffer[bufsz]; 221 const char* spec_vendor = "Sun Microsystems Inc."; 222 uint32_t spec_version = 0; 223 224 spec_vendor = "Oracle Corporation"; 225 spec_version = JDK_Version::current().major_version(); 226 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 227 228 PropertyList_add(&_system_properties, 229 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 230 PropertyList_add(&_system_properties, 231 new SystemProperty("java.vm.specification.version", buffer, false)); 232 PropertyList_add(&_system_properties, 233 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 234 } 235 236 /** 237 * Provide a slightly more user-friendly way of eliminating -XX flags. 238 * When a flag is eliminated, it can be added to this list in order to 239 * continue accepting this flag on the command-line, while issuing a warning 240 * and ignoring the value. Once the JDK version reaches the 'accept_until' 241 * limit, we flatly refuse to admit the existence of the flag. This allows 242 * a flag to die correctly over JDK releases using HSX. 243 * But now that HSX is no longer supported only options with a future 244 * accept_until value need to be listed, and the list can be pruned 245 * on each major release. 246 */ 247 typedef struct { 248 const char* name; 249 JDK_Version obsoleted_in; // when the flag went away 250 JDK_Version accept_until; // which version to start denying the existence 251 } ObsoleteFlag; 252 253 static ObsoleteFlag obsolete_jvm_flags[] = { 254 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 255 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 256 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 257 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 258 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 259 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 260 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 261 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) }, 262 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 263 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 264 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 265 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 266 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 267 #ifndef ZERO 268 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 269 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 270 #endif // ZERO 271 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 272 { "AdaptiveSizePausePolicy", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 273 { "ParallelGCRetainPLAB", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 274 { NULL, JDK_Version(0), JDK_Version(0) } 275 }; 276 277 // Returns true if the flag is obsolete and fits into the range specified 278 // for being ignored. In the case that the flag is ignored, the 'version' 279 // value is filled in with the version number when the flag became 280 // obsolete so that that value can be displayed to the user. 281 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 282 int i = 0; 283 assert(version != NULL, "Must provide a version buffer"); 284 while (obsolete_jvm_flags[i].name != NULL) { 285 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 286 // <flag>=xxx form 287 // [-|+]<flag> form 288 size_t len = strlen(flag_status.name); 289 if (((strncmp(flag_status.name, s, len) == 0) && 290 (strlen(s) == len)) || 291 ((s[0] == '+' || s[0] == '-') && 292 (strncmp(flag_status.name, &s[1], len) == 0) && 293 (strlen(&s[1]) == len))) { 294 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 295 *version = flag_status.obsoleted_in; 296 return true; 297 } 298 } 299 i++; 300 } 301 return false; 302 } 303 304 // Constructs the system class path (aka boot class path) from the following 305 // components, in order: 306 // 307 // prefix // from -Xbootclasspath/p:... 308 // base // from os::get_system_properties() or -Xbootclasspath= 309 // suffix // from -Xbootclasspath/a:... 310 // 311 // This could be AllStatic, but it isn't needed after argument processing is 312 // complete. 313 class SysClassPath: public StackObj { 314 public: 315 SysClassPath(const char* base); 316 ~SysClassPath(); 317 318 inline void set_base(const char* base); 319 inline void add_prefix(const char* prefix); 320 inline void add_suffix_to_prefix(const char* suffix); 321 inline void add_suffix(const char* suffix); 322 inline void reset_path(const char* base); 323 324 inline const char* get_base() const { return _items[_scp_base]; } 325 inline const char* get_prefix() const { return _items[_scp_prefix]; } 326 inline const char* get_suffix() const { return _items[_scp_suffix]; } 327 328 // Combine all the components into a single c-heap-allocated string; caller 329 // must free the string if/when no longer needed. 330 char* combined_path(); 331 332 private: 333 // Utility routines. 334 static char* add_to_path(const char* path, const char* str, bool prepend); 335 static char* add_jars_to_path(char* path, const char* directory); 336 337 inline void reset_item_at(int index); 338 339 // Array indices for the items that make up the sysclasspath. All except the 340 // base are allocated in the C heap and freed by this class. 341 enum { 342 _scp_prefix, // from -Xbootclasspath/p:... 343 _scp_base, // the default sysclasspath 344 _scp_suffix, // from -Xbootclasspath/a:... 345 _scp_nitems // the number of items, must be last. 346 }; 347 348 const char* _items[_scp_nitems]; 349 }; 350 351 SysClassPath::SysClassPath(const char* base) { 352 memset(_items, 0, sizeof(_items)); 353 _items[_scp_base] = base; 354 } 355 356 SysClassPath::~SysClassPath() { 357 // Free everything except the base. 358 for (int i = 0; i < _scp_nitems; ++i) { 359 if (i != _scp_base) reset_item_at(i); 360 } 361 } 362 363 inline void SysClassPath::set_base(const char* base) { 364 _items[_scp_base] = base; 365 } 366 367 inline void SysClassPath::add_prefix(const char* prefix) { 368 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 369 } 370 371 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 372 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 373 } 374 375 inline void SysClassPath::add_suffix(const char* suffix) { 376 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 377 } 378 379 inline void SysClassPath::reset_item_at(int index) { 380 assert(index < _scp_nitems && index != _scp_base, "just checking"); 381 if (_items[index] != NULL) { 382 FREE_C_HEAP_ARRAY(char, _items[index]); 383 _items[index] = NULL; 384 } 385 } 386 387 inline void SysClassPath::reset_path(const char* base) { 388 // Clear the prefix and suffix. 389 reset_item_at(_scp_prefix); 390 reset_item_at(_scp_suffix); 391 set_base(base); 392 } 393 394 //------------------------------------------------------------------------------ 395 396 397 // Combine the bootclasspath elements, some of which may be null, into a single 398 // c-heap-allocated string. 399 char* SysClassPath::combined_path() { 400 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 401 402 size_t lengths[_scp_nitems]; 403 size_t total_len = 0; 404 405 const char separator = *os::path_separator(); 406 407 // Get the lengths. 408 int i; 409 for (i = 0; i < _scp_nitems; ++i) { 410 if (_items[i] != NULL) { 411 lengths[i] = strlen(_items[i]); 412 // Include space for the separator char (or a NULL for the last item). 413 total_len += lengths[i] + 1; 414 } 415 } 416 assert(total_len > 0, "empty sysclasspath not allowed"); 417 418 // Copy the _items to a single string. 419 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 420 char* cp_tmp = cp; 421 for (i = 0; i < _scp_nitems; ++i) { 422 if (_items[i] != NULL) { 423 memcpy(cp_tmp, _items[i], lengths[i]); 424 cp_tmp += lengths[i]; 425 *cp_tmp++ = separator; 426 } 427 } 428 *--cp_tmp = '\0'; // Replace the extra separator. 429 return cp; 430 } 431 432 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 433 char* 434 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 435 char *cp; 436 437 assert(str != NULL, "just checking"); 438 if (path == NULL) { 439 size_t len = strlen(str) + 1; 440 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 441 memcpy(cp, str, len); // copy the trailing null 442 } else { 443 const char separator = *os::path_separator(); 444 size_t old_len = strlen(path); 445 size_t str_len = strlen(str); 446 size_t len = old_len + str_len + 2; 447 448 if (prepend) { 449 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 450 char* cp_tmp = cp; 451 memcpy(cp_tmp, str, str_len); 452 cp_tmp += str_len; 453 *cp_tmp = separator; 454 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 455 FREE_C_HEAP_ARRAY(char, path); 456 } else { 457 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 458 char* cp_tmp = cp + old_len; 459 *cp_tmp = separator; 460 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 461 } 462 } 463 return cp; 464 } 465 466 // Scan the directory and append any jar or zip files found to path. 467 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 468 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 469 DIR* dir = os::opendir(directory); 470 if (dir == NULL) return path; 471 472 char dir_sep[2] = { '\0', '\0' }; 473 size_t directory_len = strlen(directory); 474 const char fileSep = *os::file_separator(); 475 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 476 477 /* Scan the directory for jars/zips, appending them to path. */ 478 struct dirent *entry; 479 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 480 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 481 const char* name = entry->d_name; 482 const char* ext = name + strlen(name) - 4; 483 bool isJarOrZip = ext > name && 484 (os::file_name_strcmp(ext, ".jar") == 0 || 485 os::file_name_strcmp(ext, ".zip") == 0); 486 if (isJarOrZip) { 487 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 488 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 489 path = add_to_path(path, jarpath, false); 490 FREE_C_HEAP_ARRAY(char, jarpath); 491 } 492 } 493 FREE_C_HEAP_ARRAY(char, dbuf); 494 os::closedir(dir); 495 return path; 496 } 497 498 // Parses a memory size specification string. 499 static bool atomull(const char *s, julong* result) { 500 julong n = 0; 501 int args_read = 0; 502 bool is_hex = false; 503 // Skip leading 0[xX] for hexadecimal 504 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) { 505 s += 2; 506 is_hex = true; 507 args_read = sscanf(s, JULONG_FORMAT_X, &n); 508 } else { 509 args_read = sscanf(s, JULONG_FORMAT, &n); 510 } 511 if (args_read != 1) { 512 return false; 513 } 514 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) { 515 s++; 516 } 517 // 4705540: illegal if more characters are found after the first non-digit 518 if (strlen(s) > 1) { 519 return false; 520 } 521 switch (*s) { 522 case 'T': case 't': 523 *result = n * G * K; 524 // Check for overflow. 525 if (*result/((julong)G * K) != n) return false; 526 return true; 527 case 'G': case 'g': 528 *result = n * G; 529 if (*result/G != n) return false; 530 return true; 531 case 'M': case 'm': 532 *result = n * M; 533 if (*result/M != n) return false; 534 return true; 535 case 'K': case 'k': 536 *result = n * K; 537 if (*result/K != n) return false; 538 return true; 539 case '\0': 540 *result = n; 541 return true; 542 default: 543 return false; 544 } 545 } 546 547 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 548 if (size < min_size) return arg_too_small; 549 // Check that size will fit in a size_t (only relevant on 32-bit) 550 if (size > max_uintx) return arg_too_big; 551 return arg_in_range; 552 } 553 554 // Describe an argument out of range error 555 void Arguments::describe_range_error(ArgsRange errcode) { 556 switch(errcode) { 557 case arg_too_big: 558 jio_fprintf(defaultStream::error_stream(), 559 "The specified size exceeds the maximum " 560 "representable size.\n"); 561 break; 562 case arg_too_small: 563 case arg_unreadable: 564 case arg_in_range: 565 // do nothing for now 566 break; 567 default: 568 ShouldNotReachHere(); 569 } 570 } 571 572 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) { 573 return CommandLineFlags::boolAtPut(name, &value, origin); 574 } 575 576 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 577 double v; 578 if (sscanf(value, "%lf", &v) != 1) { 579 return false; 580 } 581 582 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 583 return true; 584 } 585 return false; 586 } 587 588 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 589 julong v; 590 intx intx_v; 591 bool is_neg = false; 592 // Check the sign first since atomull() parses only unsigned values. 593 if (*value == '-') { 594 if (!CommandLineFlags::intxAt(name, &intx_v)) { 595 return false; 596 } 597 value++; 598 is_neg = true; 599 } 600 if (!atomull(value, &v)) { 601 return false; 602 } 603 intx_v = (intx) v; 604 if (is_neg) { 605 intx_v = -intx_v; 606 } 607 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 608 return true; 609 } 610 uintx uintx_v = (uintx) v; 611 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 612 return true; 613 } 614 uint64_t uint64_t_v = (uint64_t) v; 615 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 616 return true; 617 } 618 size_t size_t_v = (size_t) v; 619 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) { 620 return true; 621 } 622 return false; 623 } 624 625 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 626 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 627 // Contract: CommandLineFlags always returns a pointer that needs freeing. 628 FREE_C_HEAP_ARRAY(char, value); 629 return true; 630 } 631 632 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 633 const char* old_value = ""; 634 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 635 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 636 size_t new_len = strlen(new_value); 637 const char* value; 638 char* free_this_too = NULL; 639 if (old_len == 0) { 640 value = new_value; 641 } else if (new_len == 0) { 642 value = old_value; 643 } else { 644 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 645 // each new setting adds another LINE to the switch: 646 sprintf(buf, "%s\n%s", old_value, new_value); 647 value = buf; 648 free_this_too = buf; 649 } 650 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 651 // CommandLineFlags always returns a pointer that needs freeing. 652 FREE_C_HEAP_ARRAY(char, value); 653 if (free_this_too != NULL) { 654 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 655 FREE_C_HEAP_ARRAY(char, free_this_too); 656 } 657 return true; 658 } 659 660 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 661 662 // range of acceptable characters spelled out for portability reasons 663 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 664 #define BUFLEN 255 665 char name[BUFLEN+1]; 666 char dummy; 667 668 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 669 return set_bool_flag(name, false, origin); 670 } 671 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 672 return set_bool_flag(name, true, origin); 673 } 674 675 char punct; 676 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 677 const char* value = strchr(arg, '=') + 1; 678 Flag* flag = Flag::find_flag(name, strlen(name)); 679 if (flag != NULL && flag->is_ccstr()) { 680 if (flag->ccstr_accumulates()) { 681 return append_to_string_flag(name, value, origin); 682 } else { 683 if (value[0] == '\0') { 684 value = NULL; 685 } 686 return set_string_flag(name, value, origin); 687 } 688 } 689 } 690 691 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 692 const char* value = strchr(arg, '=') + 1; 693 // -XX:Foo:=xxx will reset the string flag to the given value. 694 if (value[0] == '\0') { 695 value = NULL; 696 } 697 return set_string_flag(name, value, origin); 698 } 699 700 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 701 #define SIGNED_NUMBER_RANGE "[-0123456789]" 702 #define NUMBER_RANGE "[0123456789]" 703 char value[BUFLEN + 1]; 704 char value2[BUFLEN + 1]; 705 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 706 // Looks like a floating-point number -- try again with more lenient format string 707 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 708 return set_fp_numeric_flag(name, value, origin); 709 } 710 } 711 712 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 713 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 714 return set_numeric_flag(name, value, origin); 715 } 716 717 return false; 718 } 719 720 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 721 assert(bldarray != NULL, "illegal argument"); 722 723 if (arg == NULL) { 724 return; 725 } 726 727 int new_count = *count + 1; 728 729 // expand the array and add arg to the last element 730 if (*bldarray == NULL) { 731 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 732 } else { 733 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 734 } 735 (*bldarray)[*count] = os::strdup_check_oom(arg); 736 *count = new_count; 737 } 738 739 void Arguments::build_jvm_args(const char* arg) { 740 add_string(&_jvm_args_array, &_num_jvm_args, arg); 741 } 742 743 void Arguments::build_jvm_flags(const char* arg) { 744 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 745 } 746 747 // utility function to return a string that concatenates all 748 // strings in a given char** array 749 const char* Arguments::build_resource_string(char** args, int count) { 750 if (args == NULL || count == 0) { 751 return NULL; 752 } 753 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 754 for (int i = 1; i < count; i++) { 755 length += strlen(args[i]) + 1; // add 1 for a space 756 } 757 char* s = NEW_RESOURCE_ARRAY(char, length); 758 strcpy(s, args[0]); 759 for (int j = 1; j < count; j++) { 760 strcat(s, " "); 761 strcat(s, args[j]); 762 } 763 return (const char*) s; 764 } 765 766 void Arguments::print_on(outputStream* st) { 767 st->print_cr("VM Arguments:"); 768 if (num_jvm_flags() > 0) { 769 st->print("jvm_flags: "); print_jvm_flags_on(st); 770 } 771 if (num_jvm_args() > 0) { 772 st->print("jvm_args: "); print_jvm_args_on(st); 773 } 774 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 775 if (_java_class_path != NULL) { 776 char* path = _java_class_path->value(); 777 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 778 } 779 st->print_cr("Launcher Type: %s", _sun_java_launcher); 780 } 781 782 void Arguments::print_jvm_flags_on(outputStream* st) { 783 if (_num_jvm_flags > 0) { 784 for (int i=0; i < _num_jvm_flags; i++) { 785 st->print("%s ", _jvm_flags_array[i]); 786 } 787 st->cr(); 788 } 789 } 790 791 void Arguments::print_jvm_args_on(outputStream* st) { 792 if (_num_jvm_args > 0) { 793 for (int i=0; i < _num_jvm_args; i++) { 794 st->print("%s ", _jvm_args_array[i]); 795 } 796 st->cr(); 797 } 798 } 799 800 bool Arguments::process_argument(const char* arg, 801 jboolean ignore_unrecognized, Flag::Flags origin) { 802 803 JDK_Version since = JDK_Version(); 804 805 if (parse_argument(arg, origin) || ignore_unrecognized) { 806 return true; 807 } 808 809 bool has_plus_minus = (*arg == '+' || *arg == '-'); 810 const char* const argname = has_plus_minus ? arg + 1 : arg; 811 if (is_newly_obsolete(arg, &since)) { 812 char version[256]; 813 since.to_string(version, sizeof(version)); 814 warning("ignoring option %s; support was removed in %s", argname, version); 815 return true; 816 } 817 818 // For locked flags, report a custom error message if available. 819 // Otherwise, report the standard unrecognized VM option. 820 821 size_t arg_len; 822 const char* equal_sign = strchr(argname, '='); 823 if (equal_sign == NULL) { 824 arg_len = strlen(argname); 825 } else { 826 arg_len = equal_sign - argname; 827 } 828 829 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 830 if (found_flag != NULL) { 831 char locked_message_buf[BUFLEN]; 832 found_flag->get_locked_message(locked_message_buf, BUFLEN); 833 if (strlen(locked_message_buf) == 0) { 834 if (found_flag->is_bool() && !has_plus_minus) { 835 jio_fprintf(defaultStream::error_stream(), 836 "Missing +/- setting for VM option '%s'\n", argname); 837 } else if (!found_flag->is_bool() && has_plus_minus) { 838 jio_fprintf(defaultStream::error_stream(), 839 "Unexpected +/- setting in VM option '%s'\n", argname); 840 } else { 841 jio_fprintf(defaultStream::error_stream(), 842 "Improperly specified VM option '%s'\n", argname); 843 } 844 } else { 845 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 846 } 847 } else { 848 jio_fprintf(defaultStream::error_stream(), 849 "Unrecognized VM option '%s'\n", argname); 850 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 851 if (fuzzy_matched != NULL) { 852 jio_fprintf(defaultStream::error_stream(), 853 "Did you mean '%s%s%s'? ", 854 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 855 fuzzy_matched->_name, 856 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 857 if (is_newly_obsolete(fuzzy_matched->_name, &since)) { 858 char version[256]; 859 since.to_string(version, sizeof(version)); 860 jio_fprintf(defaultStream::error_stream(), 861 "Warning: support for %s was removed in %s\n", 862 fuzzy_matched->_name, 863 version); 864 } 865 } 866 } 867 868 // allow for commandline "commenting out" options like -XX:#+Verbose 869 return arg[0] == '#'; 870 } 871 872 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 873 FILE* stream = fopen(file_name, "rb"); 874 if (stream == NULL) { 875 if (should_exist) { 876 jio_fprintf(defaultStream::error_stream(), 877 "Could not open settings file %s\n", file_name); 878 return false; 879 } else { 880 return true; 881 } 882 } 883 884 char token[1024]; 885 int pos = 0; 886 887 bool in_white_space = true; 888 bool in_comment = false; 889 bool in_quote = false; 890 char quote_c = 0; 891 bool result = true; 892 893 int c = getc(stream); 894 while(c != EOF && pos < (int)(sizeof(token)-1)) { 895 if (in_white_space) { 896 if (in_comment) { 897 if (c == '\n') in_comment = false; 898 } else { 899 if (c == '#') in_comment = true; 900 else if (!isspace(c)) { 901 in_white_space = false; 902 token[pos++] = c; 903 } 904 } 905 } else { 906 if (c == '\n' || (!in_quote && isspace(c))) { 907 // token ends at newline, or at unquoted whitespace 908 // this allows a way to include spaces in string-valued options 909 token[pos] = '\0'; 910 logOption(token); 911 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 912 build_jvm_flags(token); 913 pos = 0; 914 in_white_space = true; 915 in_quote = false; 916 } else if (!in_quote && (c == '\'' || c == '"')) { 917 in_quote = true; 918 quote_c = c; 919 } else if (in_quote && (c == quote_c)) { 920 in_quote = false; 921 } else { 922 token[pos++] = c; 923 } 924 } 925 c = getc(stream); 926 } 927 if (pos > 0) { 928 token[pos] = '\0'; 929 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 930 build_jvm_flags(token); 931 } 932 fclose(stream); 933 return result; 934 } 935 936 //============================================================================================================= 937 // Parsing of properties (-D) 938 939 const char* Arguments::get_property(const char* key) { 940 return PropertyList_get_value(system_properties(), key); 941 } 942 943 bool Arguments::add_property(const char* prop) { 944 const char* eq = strchr(prop, '='); 945 char* key; 946 // ns must be static--its address may be stored in a SystemProperty object. 947 const static char ns[1] = {0}; 948 char* value = (char *)ns; 949 950 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 951 key = AllocateHeap(key_len + 1, mtInternal); 952 strncpy(key, prop, key_len); 953 key[key_len] = '\0'; 954 955 if (eq != NULL) { 956 size_t value_len = strlen(prop) - key_len - 1; 957 value = AllocateHeap(value_len + 1, mtInternal); 958 strncpy(value, &prop[key_len + 1], value_len + 1); 959 } 960 961 if (strcmp(key, "java.compiler") == 0) { 962 process_java_compiler_argument(value); 963 FreeHeap(key); 964 if (eq != NULL) { 965 FreeHeap(value); 966 } 967 return true; 968 } else if (strcmp(key, "sun.java.command") == 0) { 969 _java_command = value; 970 971 // Record value in Arguments, but let it get passed to Java. 972 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 973 strcmp(key, "sun.java.launcher.pid") == 0) { 974 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 975 // private and are processed in process_sun_java_launcher_properties(); 976 // the sun.java.launcher property is passed on to the java application 977 FreeHeap(key); 978 if (eq != NULL) { 979 FreeHeap(value); 980 } 981 return true; 982 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 983 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 984 // its value without going through the property list or making a Java call. 985 _java_vendor_url_bug = value; 986 } else if (strcmp(key, "sun.boot.library.path") == 0) { 987 PropertyList_unique_add(&_system_properties, key, value, true); 988 return true; 989 } 990 // Create new property and add at the end of the list 991 PropertyList_unique_add(&_system_properties, key, value); 992 return true; 993 } 994 995 //=========================================================================================================== 996 // Setting int/mixed/comp mode flags 997 998 void Arguments::set_mode_flags(Mode mode) { 999 // Set up default values for all flags. 1000 // If you add a flag to any of the branches below, 1001 // add a default value for it here. 1002 set_java_compiler(false); 1003 _mode = mode; 1004 1005 // Ensure Agent_OnLoad has the correct initial values. 1006 // This may not be the final mode; mode may change later in onload phase. 1007 PropertyList_unique_add(&_system_properties, "java.vm.info", 1008 (char*)VM_Version::vm_info_string(), false); 1009 1010 UseInterpreter = true; 1011 UseCompiler = true; 1012 UseLoopCounter = true; 1013 1014 // Default values may be platform/compiler dependent - 1015 // use the saved values 1016 ClipInlining = Arguments::_ClipInlining; 1017 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1018 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1019 BackgroundCompilation = Arguments::_BackgroundCompilation; 1020 1021 // Change from defaults based on mode 1022 switch (mode) { 1023 default: 1024 ShouldNotReachHere(); 1025 break; 1026 case _int: 1027 UseCompiler = false; 1028 UseLoopCounter = false; 1029 AlwaysCompileLoopMethods = false; 1030 UseOnStackReplacement = false; 1031 break; 1032 case _mixed: 1033 // same as default 1034 break; 1035 case _comp: 1036 UseInterpreter = false; 1037 BackgroundCompilation = false; 1038 ClipInlining = false; 1039 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1040 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1041 // compile a level 4 (C2) and then continue executing it. 1042 if (TieredCompilation) { 1043 Tier3InvokeNotifyFreqLog = 0; 1044 Tier4InvocationThreshold = 0; 1045 } 1046 break; 1047 } 1048 } 1049 1050 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1051 // Conflict: required to use shared spaces (-Xshare:on), but 1052 // incompatible command line options were chosen. 1053 1054 static void no_shared_spaces(const char* message) { 1055 if (RequireSharedSpaces) { 1056 jio_fprintf(defaultStream::error_stream(), 1057 "Class data sharing is inconsistent with other specified options.\n"); 1058 vm_exit_during_initialization("Unable to use shared archive.", message); 1059 } else { 1060 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1061 } 1062 } 1063 #endif 1064 1065 // Returns threshold scaled with the value of scale. 1066 // If scale < 0.0, threshold is returned without scaling. 1067 intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1068 if (scale == 1.0 || scale < 0.0) { 1069 return threshold; 1070 } else { 1071 return (intx)(threshold * scale); 1072 } 1073 } 1074 1075 // Returns freq_log scaled with the value of scale. 1076 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1077 // If scale < 0.0, freq_log is returned without scaling. 1078 intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1079 // Check if scaling is necessary or if negative value was specified. 1080 if (scale == 1.0 || scale < 0.0) { 1081 return freq_log; 1082 } 1083 // Check values to avoid calculating log2 of 0. 1084 if (scale == 0.0 || freq_log == 0) { 1085 return 0; 1086 } 1087 // Determine the maximum notification frequency value currently supported. 1088 // The largest mask value that the interpreter/C1 can handle is 1089 // of length InvocationCounter::number_of_count_bits. Mask values are always 1090 // one bit shorter then the value of the notification frequency. Set 1091 // max_freq_bits accordingly. 1092 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1093 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1094 if (scaled_freq == 0) { 1095 // Return 0 right away to avoid calculating log2 of 0. 1096 return 0; 1097 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1098 return max_freq_bits; 1099 } else { 1100 return log2_intptr(scaled_freq); 1101 } 1102 } 1103 1104 void Arguments::set_tiered_flags() { 1105 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1106 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1107 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1108 } 1109 if (CompilationPolicyChoice < 2) { 1110 vm_exit_during_initialization( 1111 "Incompatible compilation policy selected", NULL); 1112 } 1113 // Increase the code cache size - tiered compiles a lot more. 1114 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1115 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1116 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1117 } 1118 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1119 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1120 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1121 1122 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1123 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap) 1124 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) { 1125 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1126 } 1127 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) { 1128 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1129 } 1130 // Check consistency of code heap sizes 1131 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 1132 jio_fprintf(defaultStream::error_stream(), 1133 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 1134 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 1135 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 1136 vm_exit(1); 1137 } 1138 } 1139 } 1140 if (!UseInterpreter) { // -Xcomp 1141 Tier3InvokeNotifyFreqLog = 0; 1142 Tier4InvocationThreshold = 0; 1143 } 1144 1145 if (CompileThresholdScaling < 0) { 1146 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1147 } 1148 1149 // Scale tiered compilation thresholds. 1150 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1151 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1152 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1153 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1154 1155 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1156 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1157 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1158 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1159 1160 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1161 // once these thresholds become supported. 1162 1163 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1164 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1165 1166 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1167 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1168 1169 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1170 1171 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1172 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1173 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1174 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1175 } 1176 } 1177 1178 /** 1179 * Returns the minimum number of compiler threads needed to run the JVM. The following 1180 * configurations are possible. 1181 * 1182 * 1) The JVM is build using an interpreter only. As a result, the minimum number of 1183 * compiler threads is 0. 1184 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As 1185 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1. 1186 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However, 1187 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only 1188 * C1 can be used, so the minimum number of compiler threads is 1. 1189 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option 1190 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result, 1191 * the minimum number of compiler threads is 2. 1192 */ 1193 int Arguments::get_min_number_of_compiler_threads() { 1194 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 1195 return 0; // case 1 1196 #else 1197 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) { 1198 return 1; // case 2 or case 3 1199 } 1200 return 2; // case 4 (tiered) 1201 #endif 1202 } 1203 1204 #if INCLUDE_ALL_GCS 1205 static void disable_adaptive_size_policy(const char* collector_name) { 1206 if (UseAdaptiveSizePolicy) { 1207 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1208 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1209 collector_name); 1210 } 1211 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1212 } 1213 } 1214 1215 void Arguments::set_parnew_gc_flags() { 1216 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1217 "control point invariant"); 1218 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1219 assert(UseParNewGC, "ParNew should always be used with CMS"); 1220 1221 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1222 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1223 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1224 } else if (ParallelGCThreads == 0) { 1225 jio_fprintf(defaultStream::error_stream(), 1226 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1227 vm_exit(1); 1228 } 1229 1230 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1231 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1232 // we set them to 1024 and 1024. 1233 // See CR 6362902. 1234 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1235 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1236 } 1237 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1238 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1239 } 1240 1241 // When using compressed oops, we use local overflow stacks, 1242 // rather than using a global overflow list chained through 1243 // the klass word of the object's pre-image. 1244 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1245 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1246 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1247 } 1248 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1249 } 1250 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1251 } 1252 1253 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1254 // sparc/solaris for certain applications, but would gain from 1255 // further optimization and tuning efforts, and would almost 1256 // certainly gain from analysis of platform and environment. 1257 void Arguments::set_cms_and_parnew_gc_flags() { 1258 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1259 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1260 assert(UseParNewGC, "ParNew should always be used with CMS"); 1261 1262 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1263 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1264 1265 set_parnew_gc_flags(); 1266 1267 size_t max_heap = align_size_down(MaxHeapSize, 1268 CardTableRS::ct_max_alignment_constraint()); 1269 1270 // Now make adjustments for CMS 1271 intx tenuring_default = (intx)6; 1272 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1273 1274 // Preferred young gen size for "short" pauses: 1275 // upper bound depends on # of threads and NewRatio. 1276 const uintx parallel_gc_threads = 1277 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1278 const size_t preferred_max_new_size_unaligned = 1279 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1280 size_t preferred_max_new_size = 1281 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1282 1283 // Unless explicitly requested otherwise, size young gen 1284 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1285 1286 // If either MaxNewSize or NewRatio is set on the command line, 1287 // assume the user is trying to set the size of the young gen. 1288 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1289 1290 // Set MaxNewSize to our calculated preferred_max_new_size unless 1291 // NewSize was set on the command line and it is larger than 1292 // preferred_max_new_size. 1293 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1294 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1295 } else { 1296 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size); 1297 } 1298 if (PrintGCDetails && Verbose) { 1299 // Too early to use gclog_or_tty 1300 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1301 } 1302 1303 // Code along this path potentially sets NewSize and OldSize 1304 if (PrintGCDetails && Verbose) { 1305 // Too early to use gclog_or_tty 1306 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1307 " initial_heap_size: " SIZE_FORMAT 1308 " max_heap: " SIZE_FORMAT, 1309 min_heap_size(), InitialHeapSize, max_heap); 1310 } 1311 size_t min_new = preferred_max_new_size; 1312 if (FLAG_IS_CMDLINE(NewSize)) { 1313 min_new = NewSize; 1314 } 1315 if (max_heap > min_new && min_heap_size() > min_new) { 1316 // Unless explicitly requested otherwise, make young gen 1317 // at least min_new, and at most preferred_max_new_size. 1318 if (FLAG_IS_DEFAULT(NewSize)) { 1319 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new)); 1320 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize)); 1321 if (PrintGCDetails && Verbose) { 1322 // Too early to use gclog_or_tty 1323 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1324 } 1325 } 1326 // Unless explicitly requested otherwise, size old gen 1327 // so it's NewRatio x of NewSize. 1328 if (FLAG_IS_DEFAULT(OldSize)) { 1329 if (max_heap > NewSize) { 1330 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1331 if (PrintGCDetails && Verbose) { 1332 // Too early to use gclog_or_tty 1333 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1334 } 1335 } 1336 } 1337 } 1338 } 1339 // Unless explicitly requested otherwise, definitely 1340 // promote all objects surviving "tenuring_default" scavenges. 1341 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1342 FLAG_IS_DEFAULT(SurvivorRatio)) { 1343 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1344 } 1345 // If we decided above (or user explicitly requested) 1346 // `promote all' (via MaxTenuringThreshold := 0), 1347 // prefer minuscule survivor spaces so as not to waste 1348 // space for (non-existent) survivors 1349 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1350 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1351 } 1352 1353 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1354 // but rather the number of free blocks of a given size that are used when 1355 // replenishing the local per-worker free list caches. 1356 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1357 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1358 // OldPLAB sizing manually turned off: Use a larger default setting, 1359 // unless it was manually specified. This is because a too-low value 1360 // will slow down scavenges. 1361 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166 1362 } else { 1363 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1364 } 1365 } 1366 1367 // If either of the static initialization defaults have changed, note this 1368 // modification. 1369 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1370 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1371 } 1372 if (PrintGCDetails && Verbose) { 1373 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1374 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1375 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1376 } 1377 } 1378 #endif // INCLUDE_ALL_GCS 1379 1380 void set_object_alignment() { 1381 // Object alignment. 1382 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1383 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1384 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1385 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1386 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1387 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1388 1389 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1390 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1391 1392 // Oop encoding heap max 1393 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1394 1395 #if INCLUDE_ALL_GCS 1396 // Set CMS global values 1397 CompactibleFreeListSpace::set_cms_values(); 1398 #endif // INCLUDE_ALL_GCS 1399 } 1400 1401 bool verify_object_alignment() { 1402 // Object alignment. 1403 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1404 jio_fprintf(defaultStream::error_stream(), 1405 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1406 (int)ObjectAlignmentInBytes); 1407 return false; 1408 } 1409 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1410 jio_fprintf(defaultStream::error_stream(), 1411 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1412 (int)ObjectAlignmentInBytes, BytesPerLong); 1413 return false; 1414 } 1415 // It does not make sense to have big object alignment 1416 // since a space lost due to alignment will be greater 1417 // then a saved space from compressed oops. 1418 if ((int)ObjectAlignmentInBytes > 256) { 1419 jio_fprintf(defaultStream::error_stream(), 1420 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1421 (int)ObjectAlignmentInBytes); 1422 return false; 1423 } 1424 // In case page size is very small. 1425 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1426 jio_fprintf(defaultStream::error_stream(), 1427 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1428 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1429 return false; 1430 } 1431 if(SurvivorAlignmentInBytes == 0) { 1432 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1433 } else { 1434 if (!is_power_of_2(SurvivorAlignmentInBytes)) { 1435 jio_fprintf(defaultStream::error_stream(), 1436 "error: SurvivorAlignmentInBytes=%d must be power of 2\n", 1437 (int)SurvivorAlignmentInBytes); 1438 return false; 1439 } 1440 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) { 1441 jio_fprintf(defaultStream::error_stream(), 1442 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n", 1443 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes); 1444 return false; 1445 } 1446 } 1447 return true; 1448 } 1449 1450 size_t Arguments::max_heap_for_compressed_oops() { 1451 // Avoid sign flip. 1452 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1453 // We need to fit both the NULL page and the heap into the memory budget, while 1454 // keeping alignment constraints of the heap. To guarantee the latter, as the 1455 // NULL page is located before the heap, we pad the NULL page to the conservative 1456 // maximum alignment that the GC may ever impose upon the heap. 1457 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1458 _conservative_max_heap_alignment); 1459 1460 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1461 NOT_LP64(ShouldNotReachHere(); return 0); 1462 } 1463 1464 bool Arguments::should_auto_select_low_pause_collector() { 1465 if (UseAutoGCSelectPolicy && 1466 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1467 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1468 if (PrintGCDetails) { 1469 // Cannot use gclog_or_tty yet. 1470 tty->print_cr("Automatic selection of the low pause collector" 1471 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1472 } 1473 return true; 1474 } 1475 return false; 1476 } 1477 1478 void Arguments::set_use_compressed_oops() { 1479 #ifndef ZERO 1480 #ifdef _LP64 1481 // MaxHeapSize is not set up properly at this point, but 1482 // the only value that can override MaxHeapSize if we are 1483 // to use UseCompressedOops is InitialHeapSize. 1484 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1485 1486 if (max_heap_size <= max_heap_for_compressed_oops()) { 1487 #if !defined(COMPILER1) || defined(TIERED) 1488 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1489 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1490 } 1491 #endif 1492 } else { 1493 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1494 warning("Max heap size too large for Compressed Oops"); 1495 FLAG_SET_DEFAULT(UseCompressedOops, false); 1496 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1497 } 1498 } 1499 #endif // _LP64 1500 #endif // ZERO 1501 } 1502 1503 1504 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1505 // set_use_compressed_oops(). 1506 void Arguments::set_use_compressed_klass_ptrs() { 1507 #ifndef ZERO 1508 #ifdef _LP64 1509 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1510 if (!UseCompressedOops) { 1511 if (UseCompressedClassPointers) { 1512 warning("UseCompressedClassPointers requires UseCompressedOops"); 1513 } 1514 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1515 } else { 1516 // Turn on UseCompressedClassPointers too 1517 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1518 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1519 } 1520 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1521 if (UseCompressedClassPointers) { 1522 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1523 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1524 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1525 } 1526 } 1527 } 1528 #endif // _LP64 1529 #endif // !ZERO 1530 } 1531 1532 void Arguments::set_conservative_max_heap_alignment() { 1533 // The conservative maximum required alignment for the heap is the maximum of 1534 // the alignments imposed by several sources: any requirements from the heap 1535 // itself, the collector policy and the maximum page size we may run the VM 1536 // with. 1537 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1538 #if INCLUDE_ALL_GCS 1539 if (UseParallelGC) { 1540 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1541 } else if (UseG1GC) { 1542 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1543 } 1544 #endif // INCLUDE_ALL_GCS 1545 _conservative_max_heap_alignment = MAX4(heap_alignment, 1546 (size_t)os::vm_allocation_granularity(), 1547 os::max_page_size(), 1548 CollectorPolicy::compute_heap_alignment()); 1549 } 1550 1551 void Arguments::select_gc_ergonomically() { 1552 if (os::is_server_class_machine()) { 1553 if (should_auto_select_low_pause_collector()) { 1554 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1555 } else { 1556 FLAG_SET_ERGO(bool, UseParallelGC, true); 1557 } 1558 } 1559 } 1560 1561 void Arguments::select_gc() { 1562 if (!gc_selected()) { 1563 select_gc_ergonomically(); 1564 } 1565 } 1566 1567 void Arguments::set_ergonomics_flags() { 1568 select_gc(); 1569 1570 #ifdef COMPILER2 1571 // Shared spaces work fine with other GCs but causes bytecode rewriting 1572 // to be disabled, which hurts interpreter performance and decreases 1573 // server performance. When -server is specified, keep the default off 1574 // unless it is asked for. Future work: either add bytecode rewriting 1575 // at link time, or rewrite bytecodes in non-shared methods. 1576 if (!DumpSharedSpaces && !RequireSharedSpaces && 1577 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1578 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1579 } 1580 #endif 1581 1582 set_conservative_max_heap_alignment(); 1583 1584 #ifndef ZERO 1585 #ifdef _LP64 1586 set_use_compressed_oops(); 1587 1588 // set_use_compressed_klass_ptrs() must be called after calling 1589 // set_use_compressed_oops(). 1590 set_use_compressed_klass_ptrs(); 1591 1592 // Also checks that certain machines are slower with compressed oops 1593 // in vm_version initialization code. 1594 #endif // _LP64 1595 #endif // !ZERO 1596 } 1597 1598 void Arguments::set_parallel_gc_flags() { 1599 assert(UseParallelGC || UseParallelOldGC, "Error"); 1600 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1601 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1602 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1603 } 1604 FLAG_SET_DEFAULT(UseParallelGC, true); 1605 1606 // If no heap maximum was requested explicitly, use some reasonable fraction 1607 // of the physical memory, up to a maximum of 1GB. 1608 FLAG_SET_DEFAULT(ParallelGCThreads, 1609 Abstract_VM_Version::parallel_worker_threads()); 1610 if (ParallelGCThreads == 0) { 1611 jio_fprintf(defaultStream::error_stream(), 1612 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1613 vm_exit(1); 1614 } 1615 1616 if (UseAdaptiveSizePolicy) { 1617 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1618 // unless the user actually sets these flags. 1619 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1620 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1621 _min_heap_free_ratio = MinHeapFreeRatio; 1622 } 1623 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1624 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1625 _max_heap_free_ratio = MaxHeapFreeRatio; 1626 } 1627 } 1628 1629 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1630 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1631 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1632 // See CR 6362902 for details. 1633 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1634 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1635 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1636 } 1637 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1638 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1639 } 1640 } 1641 1642 if (UseParallelOldGC) { 1643 // Par compact uses lower default values since they are treated as 1644 // minimums. These are different defaults because of the different 1645 // interpretation and are not ergonomically set. 1646 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1647 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1648 } 1649 } 1650 } 1651 1652 void Arguments::set_g1_gc_flags() { 1653 assert(UseG1GC, "Error"); 1654 #ifdef COMPILER1 1655 FastTLABRefill = false; 1656 #endif 1657 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1658 if (ParallelGCThreads == 0) { 1659 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1660 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1661 } 1662 1663 #if INCLUDE_ALL_GCS 1664 if (G1ConcRefinementThreads == 0) { 1665 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads); 1666 } 1667 #endif 1668 1669 // MarkStackSize will be set (if it hasn't been set by the user) 1670 // when concurrent marking is initialized. 1671 // Its value will be based upon the number of parallel marking threads. 1672 // But we do set the maximum mark stack size here. 1673 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1674 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1675 } 1676 1677 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1678 // In G1, we want the default GC overhead goal to be higher than 1679 // say in PS. So we set it here to 10%. Otherwise the heap might 1680 // be expanded more aggressively than we would like it to. In 1681 // fact, even 10% seems to not be high enough in some cases 1682 // (especially small GC stress tests that the main thing they do 1683 // is allocation). We might consider increase it further. 1684 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1685 } 1686 1687 if (PrintGCDetails && Verbose) { 1688 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1689 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1690 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1691 } 1692 } 1693 1694 #if !INCLUDE_ALL_GCS 1695 #ifdef ASSERT 1696 static bool verify_serial_gc_flags() { 1697 return (UseSerialGC && 1698 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC || 1699 UseParallelGC || UseParallelOldGC)); 1700 } 1701 #endif // ASSERT 1702 #endif // INCLUDE_ALL_GCS 1703 1704 void Arguments::set_gc_specific_flags() { 1705 #if INCLUDE_ALL_GCS 1706 // Set per-collector flags 1707 if (UseParallelGC || UseParallelOldGC) { 1708 set_parallel_gc_flags(); 1709 } else if (UseConcMarkSweepGC) { 1710 set_cms_and_parnew_gc_flags(); 1711 } else if (UseG1GC) { 1712 set_g1_gc_flags(); 1713 } 1714 check_deprecated_gc_flags(); 1715 if (AssumeMP && !UseSerialGC) { 1716 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 1717 warning("If the number of processors is expected to increase from one, then" 1718 " you should configure the number of parallel GC threads appropriately" 1719 " using -XX:ParallelGCThreads=N"); 1720 } 1721 } 1722 if (MinHeapFreeRatio == 100) { 1723 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1724 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 1725 } 1726 #else // INCLUDE_ALL_GCS 1727 assert(verify_serial_gc_flags(), "SerialGC unset"); 1728 #endif // INCLUDE_ALL_GCS 1729 } 1730 1731 julong Arguments::limit_by_allocatable_memory(julong limit) { 1732 julong max_allocatable; 1733 julong result = limit; 1734 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1735 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1736 } 1737 return result; 1738 } 1739 1740 // Use static initialization to get the default before parsing 1741 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1742 1743 void Arguments::set_heap_size() { 1744 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1745 // Deprecated flag 1746 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1747 } 1748 1749 const julong phys_mem = 1750 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1751 : (julong)MaxRAM; 1752 1753 // If the maximum heap size has not been set with -Xmx, 1754 // then set it as fraction of the size of physical memory, 1755 // respecting the maximum and minimum sizes of the heap. 1756 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1757 julong reasonable_max = phys_mem / MaxRAMFraction; 1758 1759 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1760 // Small physical memory, so use a minimum fraction of it for the heap 1761 reasonable_max = phys_mem / MinRAMFraction; 1762 } else { 1763 // Not-small physical memory, so require a heap at least 1764 // as large as MaxHeapSize 1765 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1766 } 1767 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1768 // Limit the heap size to ErgoHeapSizeLimit 1769 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1770 } 1771 if (UseCompressedOops) { 1772 // Limit the heap size to the maximum possible when using compressed oops 1773 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1774 1775 // HeapBaseMinAddress can be greater than default but not less than. 1776 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1777 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1778 // matches compressed oops printing flags 1779 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 1780 jio_fprintf(defaultStream::error_stream(), 1781 "HeapBaseMinAddress must be at least " SIZE_FORMAT 1782 " (" SIZE_FORMAT "G) which is greater than value given " 1783 SIZE_FORMAT "\n", 1784 DefaultHeapBaseMinAddress, 1785 DefaultHeapBaseMinAddress/G, 1786 HeapBaseMinAddress); 1787 } 1788 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1789 } 1790 } 1791 1792 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1793 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1794 // but it should be not less than default MaxHeapSize. 1795 max_coop_heap -= HeapBaseMinAddress; 1796 } 1797 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1798 } 1799 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1800 1801 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1802 // An initial heap size was specified on the command line, 1803 // so be sure that the maximum size is consistent. Done 1804 // after call to limit_by_allocatable_memory because that 1805 // method might reduce the allocation size. 1806 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1807 } 1808 1809 if (PrintGCDetails && Verbose) { 1810 // Cannot use gclog_or_tty yet. 1811 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1812 } 1813 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 1814 } 1815 1816 // If the minimum or initial heap_size have not been set or requested to be set 1817 // ergonomically, set them accordingly. 1818 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1819 julong reasonable_minimum = (julong)(OldSize + NewSize); 1820 1821 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1822 1823 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1824 1825 if (InitialHeapSize == 0) { 1826 julong reasonable_initial = phys_mem / InitialRAMFraction; 1827 1828 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1829 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1830 1831 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1832 1833 if (PrintGCDetails && Verbose) { 1834 // Cannot use gclog_or_tty yet. 1835 tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 1836 } 1837 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 1838 } 1839 // If the minimum heap size has not been set (via -Xms), 1840 // synchronize with InitialHeapSize to avoid errors with the default value. 1841 if (min_heap_size() == 0) { 1842 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1843 if (PrintGCDetails && Verbose) { 1844 // Cannot use gclog_or_tty yet. 1845 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1846 } 1847 } 1848 } 1849 } 1850 1851 // This must be called after ergonomics. 1852 void Arguments::set_bytecode_flags() { 1853 if (!RewriteBytecodes) { 1854 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1855 } 1856 } 1857 1858 // Aggressive optimization flags -XX:+AggressiveOpts 1859 void Arguments::set_aggressive_opts_flags() { 1860 #ifdef COMPILER2 1861 if (AggressiveUnboxing) { 1862 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1863 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1864 } else if (!EliminateAutoBox) { 1865 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1866 AggressiveUnboxing = false; 1867 } 1868 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1869 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1870 } else if (!DoEscapeAnalysis) { 1871 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1872 AggressiveUnboxing = false; 1873 } 1874 } 1875 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1876 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1877 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1878 } 1879 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1880 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1881 } 1882 1883 // Feed the cache size setting into the JDK 1884 char buffer[1024]; 1885 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1886 add_property(buffer); 1887 } 1888 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1889 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1890 } 1891 #endif 1892 1893 if (AggressiveOpts) { 1894 // Sample flag setting code 1895 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1896 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1897 // } 1898 } 1899 } 1900 1901 //=========================================================================================================== 1902 // Parsing of java.compiler property 1903 1904 void Arguments::process_java_compiler_argument(char* arg) { 1905 // For backwards compatibility, Djava.compiler=NONE or "" 1906 // causes us to switch to -Xint mode UNLESS -Xdebug 1907 // is also specified. 1908 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1909 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1910 } 1911 } 1912 1913 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1914 _sun_java_launcher = os::strdup_check_oom(launcher); 1915 } 1916 1917 bool Arguments::created_by_java_launcher() { 1918 assert(_sun_java_launcher != NULL, "property must have value"); 1919 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1920 } 1921 1922 bool Arguments::sun_java_launcher_is_altjvm() { 1923 return _sun_java_launcher_is_altjvm; 1924 } 1925 1926 //=========================================================================================================== 1927 // Parsing of main arguments 1928 1929 bool Arguments::verify_interval(uintx val, uintx min, 1930 uintx max, const char* name) { 1931 // Returns true iff value is in the inclusive interval [min..max] 1932 // false, otherwise. 1933 if (val >= min && val <= max) { 1934 return true; 1935 } 1936 jio_fprintf(defaultStream::error_stream(), 1937 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1938 " and " UINTX_FORMAT "\n", 1939 name, val, min, max); 1940 return false; 1941 } 1942 1943 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1944 // Returns true if given value is at least specified min threshold 1945 // false, otherwise. 1946 if (val >= min ) { 1947 return true; 1948 } 1949 jio_fprintf(defaultStream::error_stream(), 1950 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1951 name, val, min); 1952 return false; 1953 } 1954 1955 bool Arguments::verify_percentage(uintx value, const char* name) { 1956 if (is_percentage(value)) { 1957 return true; 1958 } 1959 jio_fprintf(defaultStream::error_stream(), 1960 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1961 name, value); 1962 return false; 1963 } 1964 1965 // check if do gclog rotation 1966 // +UseGCLogFileRotation is a must, 1967 // no gc log rotation when log file not supplied or 1968 // NumberOfGCLogFiles is 0 1969 void check_gclog_consistency() { 1970 if (UseGCLogFileRotation) { 1971 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { 1972 jio_fprintf(defaultStream::output_stream(), 1973 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" 1974 "where num_of_file > 0\n" 1975 "GC log rotation is turned off\n"); 1976 UseGCLogFileRotation = false; 1977 } 1978 } 1979 1980 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { 1981 FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K); 1982 jio_fprintf(defaultStream::output_stream(), 1983 "GCLogFileSize changed to minimum 8K\n"); 1984 } 1985 } 1986 1987 // This function is called for -Xloggc:<filename>, it can be used 1988 // to check if a given file name(or string) conforms to the following 1989 // specification: 1990 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 1991 // %p and %t only allowed once. We only limit usage of filename not path 1992 bool is_filename_valid(const char *file_name) { 1993 const char* p = file_name; 1994 char file_sep = os::file_separator()[0]; 1995 const char* cp; 1996 // skip prefix path 1997 for (cp = file_name; *cp != '\0'; cp++) { 1998 if (*cp == '/' || *cp == file_sep) { 1999 p = cp + 1; 2000 } 2001 } 2002 2003 int count_p = 0; 2004 int count_t = 0; 2005 while (*p != '\0') { 2006 if ((*p >= '0' && *p <= '9') || 2007 (*p >= 'A' && *p <= 'Z') || 2008 (*p >= 'a' && *p <= 'z') || 2009 *p == '-' || 2010 *p == '_' || 2011 *p == '.') { 2012 p++; 2013 continue; 2014 } 2015 if (*p == '%') { 2016 if(*(p + 1) == 'p') { 2017 p += 2; 2018 count_p ++; 2019 continue; 2020 } 2021 if (*(p + 1) == 't') { 2022 p += 2; 2023 count_t ++; 2024 continue; 2025 } 2026 } 2027 return false; 2028 } 2029 return count_p < 2 && count_t < 2; 2030 } 2031 2032 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) { 2033 if (!is_percentage(min_heap_free_ratio)) { 2034 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100"); 2035 return false; 2036 } 2037 if (min_heap_free_ratio > MaxHeapFreeRatio) { 2038 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 2039 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio, 2040 MaxHeapFreeRatio); 2041 return false; 2042 } 2043 // This does not set the flag itself, but stores the value in a safe place for later usage. 2044 _min_heap_free_ratio = min_heap_free_ratio; 2045 return true; 2046 } 2047 2048 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) { 2049 if (!is_percentage(max_heap_free_ratio)) { 2050 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100"); 2051 return false; 2052 } 2053 if (max_heap_free_ratio < MinHeapFreeRatio) { 2054 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or " 2055 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio, 2056 MinHeapFreeRatio); 2057 return false; 2058 } 2059 // This does not set the flag itself, but stores the value in a safe place for later usage. 2060 _max_heap_free_ratio = max_heap_free_ratio; 2061 return true; 2062 } 2063 2064 // Check consistency of GC selection 2065 bool Arguments::check_gc_consistency() { 2066 check_gclog_consistency(); 2067 // Ensure that the user has not selected conflicting sets 2068 // of collectors. 2069 uint i = 0; 2070 if (UseSerialGC) i++; 2071 if (UseConcMarkSweepGC) i++; 2072 if (UseParallelGC || UseParallelOldGC) i++; 2073 if (UseG1GC) i++; 2074 if (i > 1) { 2075 jio_fprintf(defaultStream::error_stream(), 2076 "Conflicting collector combinations in option list; " 2077 "please refer to the release notes for the combinations " 2078 "allowed\n"); 2079 return false; 2080 } 2081 2082 if (UseConcMarkSweepGC && !UseParNewGC) { 2083 jio_fprintf(defaultStream::error_stream(), 2084 "It is not possible to combine the DefNew young collector with the CMS collector.\n"); 2085 return false; 2086 } 2087 2088 if (UseParNewGC && !UseConcMarkSweepGC) { 2089 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 2090 // set up UseSerialGC properly, so that can't be used in the check here. 2091 jio_fprintf(defaultStream::error_stream(), 2092 "It is not possible to combine the ParNew young collector with the Serial old collector.\n"); 2093 return false; 2094 } 2095 2096 return true; 2097 } 2098 2099 void Arguments::check_deprecated_gc_flags() { 2100 if (FLAG_IS_CMDLINE(UseParNewGC)) { 2101 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release"); 2102 } 2103 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 2104 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 2105 "and will likely be removed in future release"); 2106 } 2107 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 2108 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 2109 "Use MaxRAMFraction instead."); 2110 } 2111 } 2112 2113 // Check stack pages settings 2114 bool Arguments::check_stack_pages() 2115 { 2116 bool status = true; 2117 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 2118 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 2119 // greater stack shadow pages can't generate instruction to bang stack 2120 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 2121 return status; 2122 } 2123 2124 // Check the consistency of vm_init_args 2125 bool Arguments::check_vm_args_consistency() { 2126 // Method for adding checks for flag consistency. 2127 // The intent is to warn the user of all possible conflicts, 2128 // before returning an error. 2129 // Note: Needs platform-dependent factoring. 2130 bool status = true; 2131 2132 if (TLABRefillWasteFraction == 0) { 2133 jio_fprintf(defaultStream::error_stream(), 2134 "TLABRefillWasteFraction should be a denominator, " 2135 "not " SIZE_FORMAT "\n", 2136 TLABRefillWasteFraction); 2137 status = false; 2138 } 2139 2140 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 2141 "AdaptiveSizePolicyWeight"); 2142 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 2143 2144 // Divide by bucket size to prevent a large size from causing rollover when 2145 // calculating amount of memory needed to be allocated for the String table. 2146 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2147 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2148 2149 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize, 2150 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size"); 2151 2152 { 2153 // Using "else if" below to avoid printing two error messages if min > max. 2154 // This will also prevent us from reporting both min>100 and max>100 at the 2155 // same time, but that is less annoying than printing two identical errors IMHO. 2156 FormatBuffer<80> err_msg("%s",""); 2157 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) { 2158 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2159 status = false; 2160 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) { 2161 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2162 status = false; 2163 } 2164 } 2165 2166 // Min/MaxMetaspaceFreeRatio 2167 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2168 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2169 2170 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2171 jio_fprintf(defaultStream::error_stream(), 2172 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2173 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2174 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2175 MinMetaspaceFreeRatio, 2176 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2177 MaxMetaspaceFreeRatio); 2178 status = false; 2179 } 2180 2181 // Trying to keep 100% free is not practical 2182 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2183 2184 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2185 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2186 } 2187 2188 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2189 // Settings to encourage splitting. 2190 if (!FLAG_IS_CMDLINE(NewRatio)) { 2191 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2192 } 2193 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2194 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2195 } 2196 } 2197 2198 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2199 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2200 } 2201 2202 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2203 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2204 if (GCTimeLimit == 100) { 2205 // Turn off gc-overhead-limit-exceeded checks 2206 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2207 } 2208 2209 status = status && check_gc_consistency(); 2210 status = status && check_stack_pages(); 2211 2212 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2213 "CMSIncrementalSafetyFactor"); 2214 2215 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2216 // insists that we hold the requisite locks so that the iteration is 2217 // MT-safe. For the verification at start-up and shut-down, we don't 2218 // yet have a good way of acquiring and releasing these locks, 2219 // which are not visible at the CollectedHeap level. We want to 2220 // be able to acquire these locks and then do the iteration rather 2221 // than just disable the lock verification. This will be fixed under 2222 // bug 4788986. 2223 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2224 if (VerifyDuringStartup) { 2225 warning("Heap verification at start-up disabled " 2226 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2227 VerifyDuringStartup = false; // Disable verification at start-up 2228 } 2229 2230 if (VerifyBeforeExit) { 2231 warning("Heap verification at shutdown disabled " 2232 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2233 VerifyBeforeExit = false; // Disable verification at shutdown 2234 } 2235 } 2236 2237 // Note: only executed in non-PRODUCT mode 2238 if (!UseAsyncConcMarkSweepGC && 2239 (ExplicitGCInvokesConcurrent || 2240 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2241 jio_fprintf(defaultStream::error_stream(), 2242 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2243 " with -UseAsyncConcMarkSweepGC"); 2244 status = false; 2245 } 2246 2247 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2248 2249 #if INCLUDE_ALL_GCS 2250 if (UseG1GC) { 2251 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent"); 2252 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent"); 2253 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent"); 2254 2255 status = status && verify_percentage(G1ConfidencePercent, "G1ConfidencePercent"); 2256 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2257 "InitiatingHeapOccupancyPercent"); 2258 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2259 "G1RefProcDrainInterval"); 2260 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2261 "G1ConcMarkStepDurationMillis"); 2262 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2263 "G1ConcRSHotCardLimit"); 2264 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2265 "G1ConcRSLogCacheSize"); 2266 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age, 2267 "StringDeduplicationAgeThreshold"); 2268 } 2269 if (UseConcMarkSweepGC) { 2270 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2271 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2272 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2273 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2274 2275 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2276 2277 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2278 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2279 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2280 2281 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2282 2283 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2284 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2285 2286 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2287 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2288 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2289 2290 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2291 2292 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2293 2294 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2295 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2296 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2297 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2298 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2299 } 2300 2301 if (UseParallelGC || UseParallelOldGC) { 2302 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2303 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2304 2305 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2306 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2307 2308 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2309 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2310 2311 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2312 2313 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2314 } 2315 #endif // INCLUDE_ALL_GCS 2316 2317 status = status && verify_interval(RefDiscoveryPolicy, 2318 ReferenceProcessor::DiscoveryPolicyMin, 2319 ReferenceProcessor::DiscoveryPolicyMax, 2320 "RefDiscoveryPolicy"); 2321 2322 // Limit the lower bound of this flag to 1 as it is used in a division 2323 // expression. 2324 status = status && verify_interval(TLABWasteTargetPercent, 2325 1, 100, "TLABWasteTargetPercent"); 2326 2327 status = status && verify_object_alignment(); 2328 2329 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2330 "CompressedClassSpaceSize"); 2331 2332 status = status && verify_interval(MarkStackSizeMax, 2333 1, (max_jint - 1), "MarkStackSizeMax"); 2334 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2335 2336 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2337 2338 status = status && verify_min_value(HeapSizePerGCThread, (size_t) os::vm_page_size(), "HeapSizePerGCThread"); 2339 2340 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2341 2342 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2343 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2344 2345 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2346 2347 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2348 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2349 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2350 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2351 2352 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2353 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2354 2355 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2356 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2357 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2358 2359 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2360 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2361 2362 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold"); 2363 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold"); 2364 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2365 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2366 2367 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2368 #ifdef COMPILER1 2369 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize"); 2370 #endif 2371 status = status && verify_min_value(HeapSearchSteps, 1, "HeapSearchSteps"); 2372 2373 if (PrintNMTStatistics) { 2374 #if INCLUDE_NMT 2375 if (MemTracker::tracking_level() == NMT_off) { 2376 #endif // INCLUDE_NMT 2377 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2378 PrintNMTStatistics = false; 2379 #if INCLUDE_NMT 2380 } 2381 #endif 2382 } 2383 2384 // Need to limit the extent of the padding to reasonable size. 2385 // 8K is well beyond the reasonable HW cache line size, even with the 2386 // aggressive prefetching, while still leaving the room for segregating 2387 // among the distinct pages. 2388 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2389 jio_fprintf(defaultStream::error_stream(), 2390 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2391 ContendedPaddingWidth, 0, 8192); 2392 status = false; 2393 } 2394 2395 // Need to enforce the padding not to break the existing field alignments. 2396 // It is sufficient to check against the largest type size. 2397 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2398 jio_fprintf(defaultStream::error_stream(), 2399 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2400 ContendedPaddingWidth, BytesPerLong); 2401 status = false; 2402 } 2403 2404 // Check lower bounds of the code cache 2405 // Template Interpreter code is approximately 3X larger in debug builds. 2406 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2407 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2408 jio_fprintf(defaultStream::error_stream(), 2409 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2410 os::vm_page_size()/K); 2411 status = false; 2412 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2413 jio_fprintf(defaultStream::error_stream(), 2414 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2415 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2416 status = false; 2417 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2418 jio_fprintf(defaultStream::error_stream(), 2419 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2420 min_code_cache_size/K); 2421 status = false; 2422 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2423 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2424 jio_fprintf(defaultStream::error_stream(), 2425 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2426 CODE_CACHE_SIZE_LIMIT/M); 2427 status = false; 2428 } else if (NonNMethodCodeHeapSize < min_code_cache_size){ 2429 jio_fprintf(defaultStream::error_stream(), 2430 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2431 min_code_cache_size/K); 2432 status = false; 2433 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) 2434 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 2435 jio_fprintf(defaultStream::error_stream(), 2436 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 2437 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 2438 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 2439 status = false; 2440 } 2441 2442 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); 2443 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength"); 2444 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize"); 2445 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt"); 2446 2447 2448 int min_number_of_compiler_threads = get_min_number_of_compiler_threads(); 2449 // The default CICompilerCount's value is CI_COMPILER_COUNT. 2450 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number"); 2451 // Check the minimum number of compiler threads 2452 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount"); 2453 2454 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2455 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2456 } 2457 2458 return status; 2459 } 2460 2461 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2462 const char* option_type) { 2463 if (ignore) return false; 2464 2465 const char* spacer = " "; 2466 if (option_type == NULL) { 2467 option_type = ++spacer; // Set both to the empty string. 2468 } 2469 2470 if (os::obsolete_option(option)) { 2471 jio_fprintf(defaultStream::error_stream(), 2472 "Obsolete %s%soption: %s\n", option_type, spacer, 2473 option->optionString); 2474 return false; 2475 } else { 2476 jio_fprintf(defaultStream::error_stream(), 2477 "Unrecognized %s%soption: %s\n", option_type, spacer, 2478 option->optionString); 2479 return true; 2480 } 2481 } 2482 2483 static const char* user_assertion_options[] = { 2484 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2485 }; 2486 2487 static const char* system_assertion_options[] = { 2488 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2489 }; 2490 2491 bool Arguments::parse_uintx(const char* value, 2492 uintx* uintx_arg, 2493 uintx min_size) { 2494 2495 // Check the sign first since atomull() parses only unsigned values. 2496 bool value_is_positive = !(*value == '-'); 2497 2498 if (value_is_positive) { 2499 julong n; 2500 bool good_return = atomull(value, &n); 2501 if (good_return) { 2502 bool above_minimum = n >= min_size; 2503 bool value_is_too_large = n > max_uintx; 2504 2505 if (above_minimum && !value_is_too_large) { 2506 *uintx_arg = n; 2507 return true; 2508 } 2509 } 2510 } 2511 return false; 2512 } 2513 2514 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2515 julong* long_arg, 2516 julong min_size) { 2517 if (!atomull(s, long_arg)) return arg_unreadable; 2518 return check_memory_size(*long_arg, min_size); 2519 } 2520 2521 // Parse JavaVMInitArgs structure 2522 2523 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2524 // For components of the system classpath. 2525 SysClassPath scp(Arguments::get_sysclasspath()); 2526 bool scp_assembly_required = false; 2527 2528 // Save default settings for some mode flags 2529 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2530 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2531 Arguments::_ClipInlining = ClipInlining; 2532 Arguments::_BackgroundCompilation = BackgroundCompilation; 2533 2534 // Setup flags for mixed which is the default 2535 set_mode_flags(_mixed); 2536 2537 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2538 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2539 if (result != JNI_OK) { 2540 return result; 2541 } 2542 2543 // Parse JavaVMInitArgs structure passed in 2544 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE); 2545 if (result != JNI_OK) { 2546 return result; 2547 } 2548 2549 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2550 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2551 if (result != JNI_OK) { 2552 return result; 2553 } 2554 2555 // Do final processing now that all arguments have been parsed 2556 result = finalize_vm_init_args(&scp, scp_assembly_required); 2557 if (result != JNI_OK) { 2558 return result; 2559 } 2560 2561 return JNI_OK; 2562 } 2563 2564 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2565 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2566 // are dealing with -agentpath (case where name is a path), otherwise with 2567 // -agentlib 2568 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2569 char *_name; 2570 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2571 size_t _len_hprof, _len_jdwp, _len_prefix; 2572 2573 if (is_path) { 2574 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2575 return false; 2576 } 2577 2578 _name++; // skip past last path separator 2579 _len_prefix = strlen(JNI_LIB_PREFIX); 2580 2581 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2582 return false; 2583 } 2584 2585 _name += _len_prefix; 2586 _len_hprof = strlen(_hprof); 2587 _len_jdwp = strlen(_jdwp); 2588 2589 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2590 _name += _len_hprof; 2591 } 2592 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2593 _name += _len_jdwp; 2594 } 2595 else { 2596 return false; 2597 } 2598 2599 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2600 return false; 2601 } 2602 2603 return true; 2604 } 2605 2606 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2607 return true; 2608 } 2609 2610 return false; 2611 } 2612 2613 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2614 SysClassPath* scp_p, 2615 bool* scp_assembly_required_p, 2616 Flag::Flags origin) { 2617 // Remaining part of option string 2618 const char* tail; 2619 2620 // iterate over arguments 2621 for (int index = 0; index < args->nOptions; index++) { 2622 bool is_absolute_path = false; // for -agentpath vs -agentlib 2623 2624 const JavaVMOption* option = args->options + index; 2625 2626 if (!match_option(option, "-Djava.class.path", &tail) && 2627 !match_option(option, "-Dsun.java.command", &tail) && 2628 !match_option(option, "-Dsun.java.launcher", &tail)) { 2629 2630 // add all jvm options to the jvm_args string. This string 2631 // is used later to set the java.vm.args PerfData string constant. 2632 // the -Djava.class.path and the -Dsun.java.command options are 2633 // omitted from jvm_args string as each have their own PerfData 2634 // string constant object. 2635 build_jvm_args(option->optionString); 2636 } 2637 2638 // -verbose:[class/gc/jni] 2639 if (match_option(option, "-verbose", &tail)) { 2640 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2641 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2642 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2643 } else if (!strcmp(tail, ":gc")) { 2644 FLAG_SET_CMDLINE(bool, PrintGC, true); 2645 } else if (!strcmp(tail, ":jni")) { 2646 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2647 } 2648 // -da / -ea / -disableassertions / -enableassertions 2649 // These accept an optional class/package name separated by a colon, e.g., 2650 // -da:java.lang.Thread. 2651 } else if (match_option(option, user_assertion_options, &tail, true)) { 2652 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2653 if (*tail == '\0') { 2654 JavaAssertions::setUserClassDefault(enable); 2655 } else { 2656 assert(*tail == ':', "bogus match by match_option()"); 2657 JavaAssertions::addOption(tail + 1, enable); 2658 } 2659 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2660 } else if (match_option(option, system_assertion_options, &tail, false)) { 2661 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2662 JavaAssertions::setSystemClassDefault(enable); 2663 // -bootclasspath: 2664 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2665 scp_p->reset_path(tail); 2666 *scp_assembly_required_p = true; 2667 // -bootclasspath/a: 2668 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2669 scp_p->add_suffix(tail); 2670 *scp_assembly_required_p = true; 2671 // -bootclasspath/p: 2672 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2673 scp_p->add_prefix(tail); 2674 *scp_assembly_required_p = true; 2675 // -Xrun 2676 } else if (match_option(option, "-Xrun", &tail)) { 2677 if (tail != NULL) { 2678 const char* pos = strchr(tail, ':'); 2679 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2680 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2681 name[len] = '\0'; 2682 2683 char *options = NULL; 2684 if(pos != NULL) { 2685 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2686 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2687 } 2688 #if !INCLUDE_JVMTI 2689 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2690 jio_fprintf(defaultStream::error_stream(), 2691 "Profiling and debugging agents are not supported in this VM\n"); 2692 return JNI_ERR; 2693 } 2694 #endif // !INCLUDE_JVMTI 2695 add_init_library(name, options); 2696 } 2697 // -agentlib and -agentpath 2698 } else if (match_option(option, "-agentlib:", &tail) || 2699 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2700 if(tail != NULL) { 2701 const char* pos = strchr(tail, '='); 2702 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2703 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2704 name[len] = '\0'; 2705 2706 char *options = NULL; 2707 if(pos != NULL) { 2708 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2709 } 2710 #if !INCLUDE_JVMTI 2711 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2712 jio_fprintf(defaultStream::error_stream(), 2713 "Profiling and debugging agents are not supported in this VM\n"); 2714 return JNI_ERR; 2715 } 2716 #endif // !INCLUDE_JVMTI 2717 add_init_agent(name, options, is_absolute_path); 2718 } 2719 // -javaagent 2720 } else if (match_option(option, "-javaagent:", &tail)) { 2721 #if !INCLUDE_JVMTI 2722 jio_fprintf(defaultStream::error_stream(), 2723 "Instrumentation agents are not supported in this VM\n"); 2724 return JNI_ERR; 2725 #else 2726 if(tail != NULL) { 2727 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2728 add_init_agent("instrument", options, false); 2729 } 2730 #endif // !INCLUDE_JVMTI 2731 // -Xnoclassgc 2732 } else if (match_option(option, "-Xnoclassgc")) { 2733 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2734 // -Xconcgc 2735 } else if (match_option(option, "-Xconcgc")) { 2736 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2737 // -Xnoconcgc 2738 } else if (match_option(option, "-Xnoconcgc")) { 2739 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2740 // -Xbatch 2741 } else if (match_option(option, "-Xbatch")) { 2742 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2743 // -Xmn for compatibility with other JVM vendors 2744 } else if (match_option(option, "-Xmn", &tail)) { 2745 julong long_initial_young_size = 0; 2746 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2747 if (errcode != arg_in_range) { 2748 jio_fprintf(defaultStream::error_stream(), 2749 "Invalid initial young generation size: %s\n", option->optionString); 2750 describe_range_error(errcode); 2751 return JNI_EINVAL; 2752 } 2753 FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size); 2754 FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size); 2755 // -Xms 2756 } else if (match_option(option, "-Xms", &tail)) { 2757 julong long_initial_heap_size = 0; 2758 // an initial heap size of 0 means automatically determine 2759 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2760 if (errcode != arg_in_range) { 2761 jio_fprintf(defaultStream::error_stream(), 2762 "Invalid initial heap size: %s\n", option->optionString); 2763 describe_range_error(errcode); 2764 return JNI_EINVAL; 2765 } 2766 set_min_heap_size((size_t)long_initial_heap_size); 2767 // Currently the minimum size and the initial heap sizes are the same. 2768 // Can be overridden with -XX:InitialHeapSize. 2769 FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size); 2770 // -Xmx 2771 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2772 julong long_max_heap_size = 0; 2773 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2774 if (errcode != arg_in_range) { 2775 jio_fprintf(defaultStream::error_stream(), 2776 "Invalid maximum heap size: %s\n", option->optionString); 2777 describe_range_error(errcode); 2778 return JNI_EINVAL; 2779 } 2780 FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size); 2781 // Xmaxf 2782 } else if (match_option(option, "-Xmaxf", &tail)) { 2783 char* err; 2784 int maxf = (int)(strtod(tail, &err) * 100); 2785 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) { 2786 jio_fprintf(defaultStream::error_stream(), 2787 "Bad max heap free percentage size: %s\n", 2788 option->optionString); 2789 return JNI_EINVAL; 2790 } else { 2791 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2792 } 2793 // Xminf 2794 } else if (match_option(option, "-Xminf", &tail)) { 2795 char* err; 2796 int minf = (int)(strtod(tail, &err) * 100); 2797 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) { 2798 jio_fprintf(defaultStream::error_stream(), 2799 "Bad min heap free percentage size: %s\n", 2800 option->optionString); 2801 return JNI_EINVAL; 2802 } else { 2803 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2804 } 2805 // -Xss 2806 } else if (match_option(option, "-Xss", &tail)) { 2807 julong long_ThreadStackSize = 0; 2808 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2809 if (errcode != arg_in_range) { 2810 jio_fprintf(defaultStream::error_stream(), 2811 "Invalid thread stack size: %s\n", option->optionString); 2812 describe_range_error(errcode); 2813 return JNI_EINVAL; 2814 } 2815 // Internally track ThreadStackSize in units of 1024 bytes. 2816 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2817 round_to((int)long_ThreadStackSize, K) / K); 2818 // -Xoss 2819 } else if (match_option(option, "-Xoss", &tail)) { 2820 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2821 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2822 julong long_CodeCacheExpansionSize = 0; 2823 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2824 if (errcode != arg_in_range) { 2825 jio_fprintf(defaultStream::error_stream(), 2826 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2827 os::vm_page_size()/K); 2828 return JNI_EINVAL; 2829 } 2830 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2831 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2832 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2833 julong long_ReservedCodeCacheSize = 0; 2834 2835 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2836 if (errcode != arg_in_range) { 2837 jio_fprintf(defaultStream::error_stream(), 2838 "Invalid maximum code cache size: %s.\n", option->optionString); 2839 return JNI_EINVAL; 2840 } 2841 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2842 // -XX:NonNMethodCodeHeapSize= 2843 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 2844 julong long_NonNMethodCodeHeapSize = 0; 2845 2846 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 2847 if (errcode != arg_in_range) { 2848 jio_fprintf(defaultStream::error_stream(), 2849 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 2850 return JNI_EINVAL; 2851 } 2852 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize); 2853 // -XX:ProfiledCodeHeapSize= 2854 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 2855 julong long_ProfiledCodeHeapSize = 0; 2856 2857 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 2858 if (errcode != arg_in_range) { 2859 jio_fprintf(defaultStream::error_stream(), 2860 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 2861 return JNI_EINVAL; 2862 } 2863 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize); 2864 // -XX:NonProfiledCodeHeapSizee= 2865 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 2866 julong long_NonProfiledCodeHeapSize = 0; 2867 2868 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 2869 if (errcode != arg_in_range) { 2870 jio_fprintf(defaultStream::error_stream(), 2871 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 2872 return JNI_EINVAL; 2873 } 2874 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize); 2875 //-XX:IncreaseFirstTierCompileThresholdAt= 2876 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2877 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2878 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2879 jio_fprintf(defaultStream::error_stream(), 2880 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2881 option->optionString); 2882 return JNI_EINVAL; 2883 } 2884 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2885 // -green 2886 } else if (match_option(option, "-green")) { 2887 jio_fprintf(defaultStream::error_stream(), 2888 "Green threads support not available\n"); 2889 return JNI_EINVAL; 2890 // -native 2891 } else if (match_option(option, "-native")) { 2892 // HotSpot always uses native threads, ignore silently for compatibility 2893 // -Xsqnopause 2894 } else if (match_option(option, "-Xsqnopause")) { 2895 // EVM option, ignore silently for compatibility 2896 // -Xrs 2897 } else if (match_option(option, "-Xrs")) { 2898 // Classic/EVM option, new functionality 2899 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2900 } else if (match_option(option, "-Xusealtsigs")) { 2901 // change default internal VM signals used - lower case for back compat 2902 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2903 // -Xoptimize 2904 } else if (match_option(option, "-Xoptimize")) { 2905 // EVM option, ignore silently for compatibility 2906 // -Xprof 2907 } else if (match_option(option, "-Xprof")) { 2908 #if INCLUDE_FPROF 2909 _has_profile = true; 2910 #else // INCLUDE_FPROF 2911 jio_fprintf(defaultStream::error_stream(), 2912 "Flat profiling is not supported in this VM.\n"); 2913 return JNI_ERR; 2914 #endif // INCLUDE_FPROF 2915 // -Xconcurrentio 2916 } else if (match_option(option, "-Xconcurrentio")) { 2917 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2918 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2919 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2920 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2921 FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2922 2923 // -Xinternalversion 2924 } else if (match_option(option, "-Xinternalversion")) { 2925 jio_fprintf(defaultStream::output_stream(), "%s\n", 2926 VM_Version::internal_vm_info_string()); 2927 vm_exit(0); 2928 #ifndef PRODUCT 2929 // -Xprintflags 2930 } else if (match_option(option, "-Xprintflags")) { 2931 CommandLineFlags::printFlags(tty, false); 2932 vm_exit(0); 2933 #endif 2934 // -D 2935 } else if (match_option(option, "-D", &tail)) { 2936 const char* value; 2937 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2938 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2939 // abort if -Djava.endorsed.dirs is set 2940 jio_fprintf(defaultStream::output_stream(), 2941 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2942 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2943 return JNI_EINVAL; 2944 } 2945 if (match_option(option, "-Djava.ext.dirs=", &value) && 2946 *value != '\0' && strcmp(value, "\"\"") != 0) { 2947 // abort if -Djava.ext.dirs is set 2948 jio_fprintf(defaultStream::output_stream(), 2949 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2950 return JNI_EINVAL; 2951 } 2952 2953 if (!add_property(tail)) { 2954 return JNI_ENOMEM; 2955 } 2956 // Out of the box management support 2957 if (match_option(option, "-Dcom.sun.management", &tail)) { 2958 #if INCLUDE_MANAGEMENT 2959 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2960 #else 2961 jio_fprintf(defaultStream::output_stream(), 2962 "-Dcom.sun.management is not supported in this VM.\n"); 2963 return JNI_ERR; 2964 #endif 2965 } 2966 // -Xint 2967 } else if (match_option(option, "-Xint")) { 2968 set_mode_flags(_int); 2969 // -Xmixed 2970 } else if (match_option(option, "-Xmixed")) { 2971 set_mode_flags(_mixed); 2972 // -Xcomp 2973 } else if (match_option(option, "-Xcomp")) { 2974 // for testing the compiler; turn off all flags that inhibit compilation 2975 set_mode_flags(_comp); 2976 // -Xshare:dump 2977 } else if (match_option(option, "-Xshare:dump")) { 2978 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2979 set_mode_flags(_int); // Prevent compilation, which creates objects 2980 // -Xshare:on 2981 } else if (match_option(option, "-Xshare:on")) { 2982 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2983 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2984 // -Xshare:auto 2985 } else if (match_option(option, "-Xshare:auto")) { 2986 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2987 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2988 // -Xshare:off 2989 } else if (match_option(option, "-Xshare:off")) { 2990 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2991 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2992 // -Xverify 2993 } else if (match_option(option, "-Xverify", &tail)) { 2994 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2995 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2996 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2997 } else if (strcmp(tail, ":remote") == 0) { 2998 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2999 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3000 } else if (strcmp(tail, ":none") == 0) { 3001 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3002 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 3003 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3004 return JNI_EINVAL; 3005 } 3006 // -Xdebug 3007 } else if (match_option(option, "-Xdebug")) { 3008 // note this flag has been used, then ignore 3009 set_xdebug_mode(true); 3010 // -Xnoagent 3011 } else if (match_option(option, "-Xnoagent")) { 3012 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3013 } else if (match_option(option, "-Xboundthreads")) { 3014 // Bind user level threads to kernel threads (Solaris only) 3015 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 3016 } else if (match_option(option, "-Xloggc:", &tail)) { 3017 // Redirect GC output to the file. -Xloggc:<filename> 3018 // ostream_init_log(), when called will use this filename 3019 // to initialize a fileStream. 3020 _gc_log_filename = os::strdup_check_oom(tail); 3021 if (!is_filename_valid(_gc_log_filename)) { 3022 jio_fprintf(defaultStream::output_stream(), 3023 "Invalid file name for use with -Xloggc: Filename can only contain the " 3024 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 3025 "Note %%p or %%t can only be used once\n", _gc_log_filename); 3026 return JNI_EINVAL; 3027 } 3028 FLAG_SET_CMDLINE(bool, PrintGC, true); 3029 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 3030 3031 // JNI hooks 3032 } else if (match_option(option, "-Xcheck", &tail)) { 3033 if (!strcmp(tail, ":jni")) { 3034 #if !INCLUDE_JNI_CHECK 3035 warning("JNI CHECKING is not supported in this VM"); 3036 #else 3037 CheckJNICalls = true; 3038 #endif // INCLUDE_JNI_CHECK 3039 } else if (is_bad_option(option, args->ignoreUnrecognized, 3040 "check")) { 3041 return JNI_EINVAL; 3042 } 3043 } else if (match_option(option, "vfprintf")) { 3044 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3045 } else if (match_option(option, "exit")) { 3046 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3047 } else if (match_option(option, "abort")) { 3048 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3049 // -XX:+AggressiveHeap 3050 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3051 3052 // This option inspects the machine and attempts to set various 3053 // parameters to be optimal for long-running, memory allocation 3054 // intensive jobs. It is intended for machines with large 3055 // amounts of cpu and memory. 3056 3057 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 3058 // VM, but we may not be able to represent the total physical memory 3059 // available (like having 8gb of memory on a box but using a 32bit VM). 3060 // Thus, we need to make sure we're using a julong for intermediate 3061 // calculations. 3062 julong initHeapSize; 3063 julong total_memory = os::physical_memory(); 3064 3065 if (total_memory < (julong)256*M) { 3066 jio_fprintf(defaultStream::error_stream(), 3067 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 3068 vm_exit(1); 3069 } 3070 3071 // The heap size is half of available memory, or (at most) 3072 // all of possible memory less 160mb (leaving room for the OS 3073 // when using ISM). This is the maximum; because adaptive sizing 3074 // is turned on below, the actual space used may be smaller. 3075 3076 initHeapSize = MIN2(total_memory / (julong)2, 3077 total_memory - (julong)160*M); 3078 3079 initHeapSize = limit_by_allocatable_memory(initHeapSize); 3080 3081 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 3082 FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize); 3083 FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize); 3084 // Currently the minimum size and the initial heap sizes are the same. 3085 set_min_heap_size(initHeapSize); 3086 } 3087 if (FLAG_IS_DEFAULT(NewSize)) { 3088 // Make the young generation 3/8ths of the total heap. 3089 FLAG_SET_CMDLINE(size_t, NewSize, 3090 ((julong)MaxHeapSize / (julong)8) * (julong)3); 3091 FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize); 3092 } 3093 3094 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3095 FLAG_SET_DEFAULT(UseLargePages, true); 3096 #endif 3097 3098 // Increase some data structure sizes for efficiency 3099 FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize); 3100 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3101 FLAG_SET_CMDLINE(size_t, TLABSize, 256*K); 3102 3103 // See the OldPLABSize comment below, but replace 'after promotion' 3104 // with 'after copying'. YoungPLABSize is the size of the survivor 3105 // space per-gc-thread buffers. The default is 4kw. 3106 FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256*K); // Note: this is in words 3107 3108 // OldPLABSize is the size of the buffers in the old gen that 3109 // UseParallelGC uses to promote live data that doesn't fit in the 3110 // survivor spaces. At any given time, there's one for each gc thread. 3111 // The default size is 1kw. These buffers are rarely used, since the 3112 // survivor spaces are usually big enough. For specjbb, however, there 3113 // are occasions when there's lots of live data in the young gen 3114 // and we end up promoting some of it. We don't have a definite 3115 // explanation for why bumping OldPLABSize helps, but the theory 3116 // is that a bigger PLAB results in retaining something like the 3117 // original allocation order after promotion, which improves mutator 3118 // locality. A minor effect may be that larger PLABs reduce the 3119 // number of PLAB allocation events during gc. The value of 8kw 3120 // was arrived at by experimenting with specjbb. 3121 FLAG_SET_CMDLINE(size_t, OldPLABSize, 8*K); // Note: this is in words 3122 3123 // Enable parallel GC and adaptive generation sizing 3124 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 3125 FLAG_SET_DEFAULT(ParallelGCThreads, 3126 Abstract_VM_Version::parallel_worker_threads()); 3127 3128 // Encourage steady state memory management 3129 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 3130 3131 // This appears to improve mutator locality 3132 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3133 3134 // Get around early Solaris scheduling bug 3135 // (affinity vs other jobs on system) 3136 // but disallow DR and offlining (5008695). 3137 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 3138 3139 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3140 // and the last option wins. 3141 } else if (match_option(option, "-XX:+NeverTenure")) { 3142 FLAG_SET_CMDLINE(bool, NeverTenure, true); 3143 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3144 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1); 3145 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3146 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3147 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3148 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 3149 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3150 uintx max_tenuring_thresh = 0; 3151 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3152 jio_fprintf(defaultStream::error_stream(), 3153 "Invalid MaxTenuringThreshold: %s\n", option->optionString); 3154 } 3155 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh); 3156 3157 if (MaxTenuringThreshold == 0) { 3158 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3159 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3160 } else { 3161 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3162 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3163 } 3164 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3165 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3166 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3167 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3168 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3169 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3170 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3171 #if defined(DTRACE_ENABLED) 3172 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3173 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3174 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3175 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3176 #else // defined(DTRACE_ENABLED) 3177 jio_fprintf(defaultStream::error_stream(), 3178 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3179 return JNI_EINVAL; 3180 #endif // defined(DTRACE_ENABLED) 3181 #ifdef ASSERT 3182 } else if (match_option(option, "-XX:+FullGCALot")) { 3183 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3184 // disable scavenge before parallel mark-compact 3185 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3186 #endif 3187 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3188 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3189 julong stack_size = 0; 3190 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3191 if (errcode != arg_in_range) { 3192 jio_fprintf(defaultStream::error_stream(), 3193 "Invalid mark stack size: %s\n", option->optionString); 3194 describe_range_error(errcode); 3195 return JNI_EINVAL; 3196 } 3197 jio_fprintf(defaultStream::error_stream(), 3198 "Please use -XX:MarkStackSize in place of " 3199 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n"); 3200 FLAG_SET_CMDLINE(size_t, MarkStackSize, stack_size); 3201 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3202 julong max_stack_size = 0; 3203 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3204 if (errcode != arg_in_range) { 3205 jio_fprintf(defaultStream::error_stream(), 3206 "Invalid maximum mark stack size: %s\n", 3207 option->optionString); 3208 describe_range_error(errcode); 3209 return JNI_EINVAL; 3210 } 3211 jio_fprintf(defaultStream::error_stream(), 3212 "Please use -XX:MarkStackSizeMax in place of " 3213 "-XX:CMSMarkStackSizeMax in the future\n"); 3214 FLAG_SET_CMDLINE(size_t, MarkStackSizeMax, max_stack_size); 3215 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3216 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3217 uintx conc_threads = 0; 3218 if (!parse_uintx(tail, &conc_threads, 1)) { 3219 jio_fprintf(defaultStream::error_stream(), 3220 "Invalid concurrent threads: %s\n", option->optionString); 3221 return JNI_EINVAL; 3222 } 3223 jio_fprintf(defaultStream::error_stream(), 3224 "Please use -XX:ConcGCThreads in place of " 3225 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n"); 3226 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3227 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3228 julong max_direct_memory_size = 0; 3229 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3230 if (errcode != arg_in_range) { 3231 jio_fprintf(defaultStream::error_stream(), 3232 "Invalid maximum direct memory size: %s\n", 3233 option->optionString); 3234 describe_range_error(errcode); 3235 return JNI_EINVAL; 3236 } 3237 FLAG_SET_CMDLINE(size_t, MaxDirectMemorySize, max_direct_memory_size); 3238 #if !INCLUDE_MANAGEMENT 3239 } else if (match_option(option, "-XX:+ManagementServer")) { 3240 jio_fprintf(defaultStream::error_stream(), 3241 "ManagementServer is not supported in this VM.\n"); 3242 return JNI_ERR; 3243 #endif // INCLUDE_MANAGEMENT 3244 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3245 // Skip -XX:Flags= since that case has already been handled 3246 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3247 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3248 return JNI_EINVAL; 3249 } 3250 } 3251 // Unknown option 3252 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3253 return JNI_ERR; 3254 } 3255 } 3256 3257 // PrintSharedArchiveAndExit will turn on 3258 // -Xshare:on 3259 // -XX:+TraceClassPaths 3260 if (PrintSharedArchiveAndExit) { 3261 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3262 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3263 FLAG_SET_CMDLINE(bool, TraceClassPaths, true); 3264 } 3265 3266 // Change the default value for flags which have different default values 3267 // when working with older JDKs. 3268 #ifdef LINUX 3269 if (JDK_Version::current().compare_major(6) <= 0 && 3270 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3271 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3272 } 3273 #endif // LINUX 3274 fix_appclasspath(); 3275 return JNI_OK; 3276 } 3277 3278 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3279 // 3280 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3281 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3282 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3283 // path is treated as the current directory. 3284 // 3285 // This causes problems with CDS, which requires that all directories specified in the classpath 3286 // must be empty. In most cases, applications do NOT want to load classes from the current 3287 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3288 // scripts compatible with CDS. 3289 void Arguments::fix_appclasspath() { 3290 if (IgnoreEmptyClassPaths) { 3291 const char separator = *os::path_separator(); 3292 const char* src = _java_class_path->value(); 3293 3294 // skip over all the leading empty paths 3295 while (*src == separator) { 3296 src ++; 3297 } 3298 3299 char* copy = AllocateHeap(strlen(src) + 1, mtInternal); 3300 strncpy(copy, src, strlen(src) + 1); 3301 3302 // trim all trailing empty paths 3303 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3304 *tail = '\0'; 3305 } 3306 3307 char from[3] = {separator, separator, '\0'}; 3308 char to [2] = {separator, '\0'}; 3309 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3310 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3311 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3312 } 3313 3314 _java_class_path->set_value(copy); 3315 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3316 } 3317 3318 if (!PrintSharedArchiveAndExit) { 3319 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value()); 3320 } 3321 } 3322 3323 static bool has_jar_files(const char* directory) { 3324 DIR* dir = os::opendir(directory); 3325 if (dir == NULL) return false; 3326 3327 struct dirent *entry; 3328 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 3329 bool hasJarFile = false; 3330 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3331 const char* name = entry->d_name; 3332 const char* ext = name + strlen(name) - 4; 3333 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3334 } 3335 FREE_C_HEAP_ARRAY(char, dbuf); 3336 os::closedir(dir); 3337 return hasJarFile ; 3338 } 3339 3340 static int check_non_empty_dirs(const char* path) { 3341 const char separator = *os::path_separator(); 3342 const char* const end = path + strlen(path); 3343 int nonEmptyDirs = 0; 3344 while (path < end) { 3345 const char* tmp_end = strchr(path, separator); 3346 if (tmp_end == NULL) { 3347 if (has_jar_files(path)) { 3348 nonEmptyDirs++; 3349 jio_fprintf(defaultStream::output_stream(), 3350 "Non-empty directory: %s\n", path); 3351 } 3352 path = end; 3353 } else { 3354 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 3355 memcpy(dirpath, path, tmp_end - path); 3356 dirpath[tmp_end - path] = '\0'; 3357 if (has_jar_files(dirpath)) { 3358 nonEmptyDirs++; 3359 jio_fprintf(defaultStream::output_stream(), 3360 "Non-empty directory: %s\n", dirpath); 3361 } 3362 FREE_C_HEAP_ARRAY(char, dirpath); 3363 path = tmp_end + 1; 3364 } 3365 } 3366 return nonEmptyDirs; 3367 } 3368 3369 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3370 // check if the default lib/endorsed directory exists; if so, error 3371 char path[JVM_MAXPATHLEN]; 3372 const char* fileSep = os::file_separator(); 3373 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3374 3375 if (CheckEndorsedAndExtDirs) { 3376 int nonEmptyDirs = 0; 3377 // check endorsed directory 3378 nonEmptyDirs += check_non_empty_dirs(path); 3379 // check the extension directories 3380 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3381 if (nonEmptyDirs > 0) { 3382 return JNI_ERR; 3383 } 3384 } 3385 3386 DIR* dir = os::opendir(path); 3387 if (dir != NULL) { 3388 jio_fprintf(defaultStream::output_stream(), 3389 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3390 "in modular form will be supported via the concept of upgradeable modules.\n"); 3391 os::closedir(dir); 3392 return JNI_ERR; 3393 } 3394 3395 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3396 dir = os::opendir(path); 3397 if (dir != NULL) { 3398 jio_fprintf(defaultStream::output_stream(), 3399 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3400 "Use -classpath instead.\n."); 3401 os::closedir(dir); 3402 return JNI_ERR; 3403 } 3404 3405 if (scp_assembly_required) { 3406 // Assemble the bootclasspath elements into the final path. 3407 Arguments::set_sysclasspath(scp_p->combined_path()); 3408 } 3409 3410 // This must be done after all arguments have been processed. 3411 // java_compiler() true means set to "NONE" or empty. 3412 if (java_compiler() && !xdebug_mode()) { 3413 // For backwards compatibility, we switch to interpreted mode if 3414 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3415 // not specified. 3416 set_mode_flags(_int); 3417 } 3418 3419 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3420 // but like -Xint, leave compilation thresholds unaffected. 3421 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3422 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3423 set_mode_flags(_int); 3424 } 3425 3426 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3427 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3428 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3429 } 3430 3431 #ifndef COMPILER2 3432 // Don't degrade server performance for footprint 3433 if (FLAG_IS_DEFAULT(UseLargePages) && 3434 MaxHeapSize < LargePageHeapSizeThreshold) { 3435 // No need for large granularity pages w/small heaps. 3436 // Note that large pages are enabled/disabled for both the 3437 // Java heap and the code cache. 3438 FLAG_SET_DEFAULT(UseLargePages, false); 3439 } 3440 3441 #else 3442 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3443 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3444 } 3445 #endif 3446 3447 #ifndef TIERED 3448 // Tiered compilation is undefined. 3449 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3450 #endif 3451 3452 // If we are running in a headless jre, force java.awt.headless property 3453 // to be true unless the property has already been set. 3454 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3455 if (os::is_headless_jre()) { 3456 const char* headless = Arguments::get_property("java.awt.headless"); 3457 if (headless == NULL) { 3458 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3459 if (headless_env == NULL) { 3460 if (!add_property("java.awt.headless=true")) { 3461 return JNI_ENOMEM; 3462 } 3463 } else { 3464 char buffer[256]; 3465 const char *key = "java.awt.headless="; 3466 strcpy(buffer, key); 3467 strncat(buffer, headless_env, 256 - strlen(key) - 1); 3468 if (!add_property(buffer)) { 3469 return JNI_ENOMEM; 3470 } 3471 } 3472 } 3473 } 3474 3475 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) { 3476 // CMS can only be used with ParNew 3477 FLAG_SET_ERGO(bool, UseParNewGC, true); 3478 } 3479 3480 if (!check_vm_args_consistency()) { 3481 return JNI_ERR; 3482 } 3483 3484 return JNI_OK; 3485 } 3486 3487 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3488 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3489 scp_assembly_required_p); 3490 } 3491 3492 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3493 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3494 scp_assembly_required_p); 3495 } 3496 3497 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3498 char *buffer = ::getenv(name); 3499 3500 // Don't check this variable if user has special privileges 3501 // (e.g. unix su command). 3502 if (buffer == NULL || os::have_special_privileges()) { 3503 return JNI_OK; 3504 } 3505 3506 if ((buffer = os::strdup(buffer)) == NULL) { 3507 return JNI_ENOMEM; 3508 } 3509 3510 GrowableArray<JavaVMOption> options(2, true); // Construct option array 3511 jio_fprintf(defaultStream::error_stream(), 3512 "Picked up %s: %s\n", name, buffer); 3513 char* rd = buffer; // pointer to the input string (rd) 3514 while (true) { // repeat for all options in the input string 3515 while (isspace(*rd)) rd++; // skip whitespace 3516 if (*rd == 0) break; // we re done when the input string is read completely 3517 3518 // The output, option string, overwrites the input string. 3519 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3520 // input string (rd). 3521 char* wrt = rd; 3522 3523 JavaVMOption option; 3524 option.optionString = wrt; 3525 options.append(option); // Fill in option 3526 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3527 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3528 int quote = *rd; // matching quote to look for 3529 rd++; // don't copy open quote 3530 while (*rd != quote) { // include everything (even spaces) up until quote 3531 if (*rd == 0) { // string termination means unmatched string 3532 jio_fprintf(defaultStream::error_stream(), 3533 "Unmatched quote in %s\n", name); 3534 os::free(buffer); 3535 return JNI_ERR; 3536 } 3537 *wrt++ = *rd++; // copy to option string 3538 } 3539 rd++; // don't copy close quote 3540 } else { 3541 *wrt++ = *rd++; // copy to option string 3542 } 3543 } 3544 // Need to check if we're done before writing a NULL, 3545 // because the write could be to the byte that rd is pointing to. 3546 if (*rd++ == 0) { 3547 *wrt = 0; 3548 break; 3549 } 3550 *wrt = 0; // Zero terminate option 3551 } 3552 JavaVMOption* options_arr = 3553 NEW_C_HEAP_ARRAY_RETURN_NULL(JavaVMOption, options.length(), mtInternal); 3554 if (options_arr == NULL) { 3555 return JNI_ENOMEM; 3556 } 3557 for (int i = 0; i < options.length(); i++) { 3558 options_arr[i] = options.at(i); 3559 } 3560 3561 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3562 JavaVMInitArgs vm_args; 3563 vm_args.version = JNI_VERSION_1_2; 3564 vm_args.options = options_arr; 3565 vm_args.nOptions = options.length(); 3566 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3567 3568 if (PrintVMOptions) { 3569 const char* tail; 3570 for (int i = 0; i < vm_args.nOptions; i++) { 3571 const JavaVMOption *option = vm_args.options + i; 3572 if (match_option(option, "-XX:", &tail)) { 3573 logOption(tail); 3574 } 3575 } 3576 } 3577 3578 jint result = parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, 3579 Flag::ENVIRON_VAR); 3580 FREE_C_HEAP_ARRAY(JavaVMOption, options_arr); 3581 os::free(buffer); 3582 return result; 3583 } 3584 3585 void Arguments::set_shared_spaces_flags() { 3586 if (DumpSharedSpaces) { 3587 if (RequireSharedSpaces) { 3588 warning("cannot dump shared archive while using shared archive"); 3589 } 3590 UseSharedSpaces = false; 3591 #ifdef _LP64 3592 if (!UseCompressedOops || !UseCompressedClassPointers) { 3593 vm_exit_during_initialization( 3594 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3595 } 3596 } else { 3597 if (!UseCompressedOops || !UseCompressedClassPointers) { 3598 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3599 } 3600 #endif 3601 } 3602 } 3603 3604 #if !INCLUDE_ALL_GCS 3605 static void force_serial_gc() { 3606 FLAG_SET_DEFAULT(UseSerialGC, true); 3607 UNSUPPORTED_GC_OPTION(UseG1GC); 3608 UNSUPPORTED_GC_OPTION(UseParallelGC); 3609 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3610 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3611 UNSUPPORTED_GC_OPTION(UseParNewGC); 3612 } 3613 #endif // INCLUDE_ALL_GCS 3614 3615 // Sharing support 3616 // Construct the path to the archive 3617 static char* get_shared_archive_path() { 3618 char *shared_archive_path; 3619 if (SharedArchiveFile == NULL) { 3620 char jvm_path[JVM_MAXPATHLEN]; 3621 os::jvm_path(jvm_path, sizeof(jvm_path)); 3622 char *end = strrchr(jvm_path, *os::file_separator()); 3623 if (end != NULL) *end = '\0'; 3624 size_t jvm_path_len = strlen(jvm_path); 3625 size_t file_sep_len = strlen(os::file_separator()); 3626 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3627 file_sep_len + 20, mtInternal); 3628 if (shared_archive_path != NULL) { 3629 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3630 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3631 strncat(shared_archive_path, "classes.jsa", 11); 3632 } 3633 } else { 3634 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3635 if (shared_archive_path != NULL) { 3636 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3637 } 3638 } 3639 return shared_archive_path; 3640 } 3641 3642 #ifndef PRODUCT 3643 // Determine whether LogVMOutput should be implicitly turned on. 3644 static bool use_vm_log() { 3645 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3646 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3647 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3648 PrintAssembly || TraceDeoptimization || TraceDependencies || 3649 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3650 return true; 3651 } 3652 3653 #ifdef COMPILER1 3654 if (PrintC1Statistics) { 3655 return true; 3656 } 3657 #endif // COMPILER1 3658 3659 #ifdef COMPILER2 3660 if (PrintOptoAssembly || PrintOptoStatistics) { 3661 return true; 3662 } 3663 #endif // COMPILER2 3664 3665 return false; 3666 } 3667 #endif // PRODUCT 3668 3669 // Parse entry point called from JNI_CreateJavaVM 3670 3671 jint Arguments::parse(const JavaVMInitArgs* args) { 3672 3673 // Remaining part of option string 3674 const char* tail; 3675 3676 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3677 const char* hotspotrc = ".hotspotrc"; 3678 bool settings_file_specified = false; 3679 bool needs_hotspotrc_warning = false; 3680 3681 const char* flags_file; 3682 int index; 3683 for (index = 0; index < args->nOptions; index++) { 3684 const JavaVMOption *option = args->options + index; 3685 if (ArgumentsExt::process_options(option)) { 3686 continue; 3687 } 3688 if (match_option(option, "-XX:Flags=", &tail)) { 3689 flags_file = tail; 3690 settings_file_specified = true; 3691 continue; 3692 } 3693 if (match_option(option, "-XX:+PrintVMOptions")) { 3694 PrintVMOptions = true; 3695 continue; 3696 } 3697 if (match_option(option, "-XX:-PrintVMOptions")) { 3698 PrintVMOptions = false; 3699 continue; 3700 } 3701 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3702 IgnoreUnrecognizedVMOptions = true; 3703 continue; 3704 } 3705 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3706 IgnoreUnrecognizedVMOptions = false; 3707 continue; 3708 } 3709 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3710 CommandLineFlags::printFlags(tty, false); 3711 vm_exit(0); 3712 } 3713 #if INCLUDE_NMT 3714 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3715 // The launcher did not setup nmt environment variable properly. 3716 if (!MemTracker::check_launcher_nmt_support(tail)) { 3717 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3718 } 3719 3720 // Verify if nmt option is valid. 3721 if (MemTracker::verify_nmt_option()) { 3722 // Late initialization, still in single-threaded mode. 3723 if (MemTracker::tracking_level() >= NMT_summary) { 3724 MemTracker::init(); 3725 } 3726 } else { 3727 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3728 } 3729 continue; 3730 } 3731 #endif 3732 3733 3734 #ifndef PRODUCT 3735 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3736 CommandLineFlags::printFlags(tty, true); 3737 vm_exit(0); 3738 } 3739 #endif 3740 } 3741 3742 if (IgnoreUnrecognizedVMOptions) { 3743 // uncast const to modify the flag args->ignoreUnrecognized 3744 *(jboolean*)(&args->ignoreUnrecognized) = true; 3745 } 3746 3747 // Parse specified settings file 3748 if (settings_file_specified) { 3749 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3750 return JNI_EINVAL; 3751 } 3752 } else { 3753 #ifdef ASSERT 3754 // Parse default .hotspotrc settings file 3755 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3756 return JNI_EINVAL; 3757 } 3758 #else 3759 struct stat buf; 3760 if (os::stat(hotspotrc, &buf) == 0) { 3761 needs_hotspotrc_warning = true; 3762 } 3763 #endif 3764 } 3765 3766 if (PrintVMOptions) { 3767 for (index = 0; index < args->nOptions; index++) { 3768 const JavaVMOption *option = args->options + index; 3769 if (match_option(option, "-XX:", &tail)) { 3770 logOption(tail); 3771 } 3772 } 3773 } 3774 3775 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3776 jint result = parse_vm_init_args(args); 3777 if (result != JNI_OK) { 3778 return result; 3779 } 3780 3781 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3782 SharedArchivePath = get_shared_archive_path(); 3783 if (SharedArchivePath == NULL) { 3784 return JNI_ENOMEM; 3785 } 3786 3787 // Set up VerifySharedSpaces 3788 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 3789 VerifySharedSpaces = true; 3790 } 3791 3792 // Delay warning until here so that we've had a chance to process 3793 // the -XX:-PrintWarnings flag 3794 if (needs_hotspotrc_warning) { 3795 warning("%s file is present but has been ignored. " 3796 "Run with -XX:Flags=%s to load the file.", 3797 hotspotrc, hotspotrc); 3798 } 3799 3800 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3801 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3802 #endif 3803 3804 ArgumentsExt::report_unsupported_options(); 3805 3806 #ifndef PRODUCT 3807 if (TraceBytecodesAt != 0) { 3808 TraceBytecodes = true; 3809 } 3810 if (CountCompiledCalls) { 3811 if (UseCounterDecay) { 3812 warning("UseCounterDecay disabled because CountCalls is set"); 3813 UseCounterDecay = false; 3814 } 3815 } 3816 #endif // PRODUCT 3817 3818 if (ScavengeRootsInCode == 0) { 3819 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3820 warning("forcing ScavengeRootsInCode non-zero"); 3821 } 3822 ScavengeRootsInCode = 1; 3823 } 3824 3825 if (PrintGCDetails) { 3826 // Turn on -verbose:gc options as well 3827 PrintGC = true; 3828 } 3829 3830 // Set object alignment values. 3831 set_object_alignment(); 3832 3833 #if !INCLUDE_ALL_GCS 3834 force_serial_gc(); 3835 #endif // INCLUDE_ALL_GCS 3836 #if !INCLUDE_CDS 3837 if (DumpSharedSpaces || RequireSharedSpaces) { 3838 jio_fprintf(defaultStream::error_stream(), 3839 "Shared spaces are not supported in this VM\n"); 3840 return JNI_ERR; 3841 } 3842 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3843 warning("Shared spaces are not supported in this VM"); 3844 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3845 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3846 } 3847 no_shared_spaces("CDS Disabled"); 3848 #endif // INCLUDE_CDS 3849 3850 return JNI_OK; 3851 } 3852 3853 jint Arguments::apply_ergo() { 3854 3855 // Set flags based on ergonomics. 3856 set_ergonomics_flags(); 3857 3858 set_shared_spaces_flags(); 3859 3860 // Check the GC selections again. 3861 if (!check_gc_consistency()) { 3862 return JNI_EINVAL; 3863 } 3864 3865 if (TieredCompilation) { 3866 set_tiered_flags(); 3867 } else { 3868 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3869 if (CompilationPolicyChoice >= 2) { 3870 vm_exit_during_initialization( 3871 "Incompatible compilation policy selected", NULL); 3872 } 3873 // Scale CompileThreshold 3874 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 3875 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 3876 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 3877 } 3878 } 3879 3880 #ifdef COMPILER2 3881 #ifndef PRODUCT 3882 if (PrintIdealGraphLevel > 0) { 3883 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 3884 } 3885 #endif 3886 #endif 3887 3888 // Set heap size based on available physical memory 3889 set_heap_size(); 3890 3891 ArgumentsExt::set_gc_specific_flags(); 3892 3893 // Initialize Metaspace flags and alignments 3894 Metaspace::ergo_initialize(); 3895 3896 // Set bytecode rewriting flags 3897 set_bytecode_flags(); 3898 3899 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 3900 set_aggressive_opts_flags(); 3901 3902 // Turn off biased locking for locking debug mode flags, 3903 // which are subtly different from each other but neither works with 3904 // biased locking 3905 if (UseHeavyMonitors 3906 #ifdef COMPILER1 3907 || !UseFastLocking 3908 #endif // COMPILER1 3909 ) { 3910 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3911 // flag set to true on command line; warn the user that they 3912 // can't enable biased locking here 3913 warning("Biased Locking is not supported with locking debug flags" 3914 "; ignoring UseBiasedLocking flag." ); 3915 } 3916 UseBiasedLocking = false; 3917 } 3918 3919 #ifdef ZERO 3920 // Clear flags not supported on zero. 3921 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3922 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3923 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3924 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3925 #endif // CC_INTERP 3926 3927 #ifdef COMPILER2 3928 if (!EliminateLocks) { 3929 EliminateNestedLocks = false; 3930 } 3931 if (!Inline) { 3932 IncrementalInline = false; 3933 } 3934 #ifndef PRODUCT 3935 if (!IncrementalInline) { 3936 AlwaysIncrementalInline = false; 3937 } 3938 #endif 3939 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 3940 // nothing to use the profiling, turn if off 3941 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 3942 } 3943 #endif 3944 3945 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3946 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3947 DebugNonSafepoints = true; 3948 } 3949 3950 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3951 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3952 } 3953 3954 #ifndef PRODUCT 3955 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3956 if (use_vm_log()) { 3957 LogVMOutput = true; 3958 } 3959 } 3960 #endif // PRODUCT 3961 3962 if (PrintCommandLineFlags) { 3963 CommandLineFlags::printSetFlags(tty); 3964 } 3965 3966 // Apply CPU specific policy for the BiasedLocking 3967 if (UseBiasedLocking) { 3968 if (!VM_Version::use_biased_locking() && 3969 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3970 UseBiasedLocking = false; 3971 } 3972 } 3973 #ifdef COMPILER2 3974 if (!UseBiasedLocking || EmitSync != 0) { 3975 UseOptoBiasInlining = false; 3976 } 3977 #endif 3978 3979 return JNI_OK; 3980 } 3981 3982 jint Arguments::adjust_after_os() { 3983 if (UseNUMA) { 3984 if (UseParallelGC || UseParallelOldGC) { 3985 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3986 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3987 } 3988 } 3989 // UseNUMAInterleaving is set to ON for all collectors and 3990 // platforms when UseNUMA is set to ON. NUMA-aware collectors 3991 // such as the parallel collector for Linux and Solaris will 3992 // interleave old gen and survivor spaces on top of NUMA 3993 // allocation policy for the eden space. 3994 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 3995 // all platforms and ParallelGC on Windows will interleave all 3996 // of the heap spaces across NUMA nodes. 3997 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 3998 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 3999 } 4000 } 4001 return JNI_OK; 4002 } 4003 4004 int Arguments::PropertyList_count(SystemProperty* pl) { 4005 int count = 0; 4006 while(pl != NULL) { 4007 count++; 4008 pl = pl->next(); 4009 } 4010 return count; 4011 } 4012 4013 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4014 assert(key != NULL, "just checking"); 4015 SystemProperty* prop; 4016 for (prop = pl; prop != NULL; prop = prop->next()) { 4017 if (strcmp(key, prop->key()) == 0) return prop->value(); 4018 } 4019 return NULL; 4020 } 4021 4022 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4023 int count = 0; 4024 const char* ret_val = NULL; 4025 4026 while(pl != NULL) { 4027 if(count >= index) { 4028 ret_val = pl->key(); 4029 break; 4030 } 4031 count++; 4032 pl = pl->next(); 4033 } 4034 4035 return ret_val; 4036 } 4037 4038 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4039 int count = 0; 4040 char* ret_val = NULL; 4041 4042 while(pl != NULL) { 4043 if(count >= index) { 4044 ret_val = pl->value(); 4045 break; 4046 } 4047 count++; 4048 pl = pl->next(); 4049 } 4050 4051 return ret_val; 4052 } 4053 4054 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4055 SystemProperty* p = *plist; 4056 if (p == NULL) { 4057 *plist = new_p; 4058 } else { 4059 while (p->next() != NULL) { 4060 p = p->next(); 4061 } 4062 p->set_next(new_p); 4063 } 4064 } 4065 4066 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 4067 if (plist == NULL) 4068 return; 4069 4070 SystemProperty* new_p = new SystemProperty(k, v, true); 4071 PropertyList_add(plist, new_p); 4072 } 4073 4074 void Arguments::PropertyList_add(SystemProperty *element) { 4075 PropertyList_add(&_system_properties, element); 4076 } 4077 4078 // This add maintains unique property key in the list. 4079 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 4080 if (plist == NULL) 4081 return; 4082 4083 // If property key exist then update with new value. 4084 SystemProperty* prop; 4085 for (prop = *plist; prop != NULL; prop = prop->next()) { 4086 if (strcmp(k, prop->key()) == 0) { 4087 if (append) { 4088 prop->append_value(v); 4089 } else { 4090 prop->set_value(v); 4091 } 4092 return; 4093 } 4094 } 4095 4096 PropertyList_add(plist, k, v); 4097 } 4098 4099 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4100 // Returns true if all of the source pointed by src has been copied over to 4101 // the destination buffer pointed by buf. Otherwise, returns false. 4102 // Notes: 4103 // 1. If the length (buflen) of the destination buffer excluding the 4104 // NULL terminator character is not long enough for holding the expanded 4105 // pid characters, it also returns false instead of returning the partially 4106 // expanded one. 4107 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4108 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4109 char* buf, size_t buflen) { 4110 const char* p = src; 4111 char* b = buf; 4112 const char* src_end = &src[srclen]; 4113 char* buf_end = &buf[buflen - 1]; 4114 4115 while (p < src_end && b < buf_end) { 4116 if (*p == '%') { 4117 switch (*(++p)) { 4118 case '%': // "%%" ==> "%" 4119 *b++ = *p++; 4120 break; 4121 case 'p': { // "%p" ==> current process id 4122 // buf_end points to the character before the last character so 4123 // that we could write '\0' to the end of the buffer. 4124 size_t buf_sz = buf_end - b + 1; 4125 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4126 4127 // if jio_snprintf fails or the buffer is not long enough to hold 4128 // the expanded pid, returns false. 4129 if (ret < 0 || ret >= (int)buf_sz) { 4130 return false; 4131 } else { 4132 b += ret; 4133 assert(*b == '\0', "fail in copy_expand_pid"); 4134 if (p == src_end && b == buf_end + 1) { 4135 // reach the end of the buffer. 4136 return true; 4137 } 4138 } 4139 p++; 4140 break; 4141 } 4142 default : 4143 *b++ = '%'; 4144 } 4145 } else { 4146 *b++ = *p++; 4147 } 4148 } 4149 *b = '\0'; 4150 return (p == src_end); // return false if not all of the source was copied 4151 }