1 /* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoader.hpp" 27 #include "classfile/javaAssertions.hpp" 28 #include "classfile/stringTable.hpp" 29 #include "classfile/symbolTable.hpp" 30 #include "compiler/compilerOracle.hpp" 31 #include "memory/allocation.inline.hpp" 32 #include "memory/cardTableRS.hpp" 33 #include "memory/genCollectedHeap.hpp" 34 #include "memory/referenceProcessor.hpp" 35 #include "memory/universe.inline.hpp" 36 #include "oops/oop.inline.hpp" 37 #include "prims/jvmtiExport.hpp" 38 #include "runtime/arguments.hpp" 39 #include "runtime/arguments_ext.hpp" 40 #include "runtime/globals_extension.hpp" 41 #include "runtime/java.hpp" 42 #include "runtime/os.hpp" 43 #include "runtime/vm_version.hpp" 44 #include "services/management.hpp" 45 #include "services/memTracker.hpp" 46 #include "utilities/defaultStream.hpp" 47 #include "utilities/macros.hpp" 48 #include "utilities/stringUtils.hpp" 49 #include "utilities/taskqueue.hpp" 50 #if INCLUDE_ALL_GCS 51 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 52 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 53 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 54 #endif // INCLUDE_ALL_GCS 55 56 // Note: This is a special bug reporting site for the JVM 57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 58 #define DEFAULT_JAVA_LAUNCHER "generic" 59 60 #define UNSUPPORTED_GC_OPTION(gc) \ 61 do { \ 62 if (gc) { \ 63 if (FLAG_IS_CMDLINE(gc)) { \ 64 warning(#gc " is not supported in this VM. Using Serial GC."); \ 65 } \ 66 FLAG_SET_DEFAULT(gc, false); \ 67 } \ 68 } while(0) 69 70 char** Arguments::_jvm_flags_array = NULL; 71 int Arguments::_num_jvm_flags = 0; 72 char** Arguments::_jvm_args_array = NULL; 73 int Arguments::_num_jvm_args = 0; 74 char* Arguments::_java_command = NULL; 75 SystemProperty* Arguments::_system_properties = NULL; 76 const char* Arguments::_gc_log_filename = NULL; 77 bool Arguments::_has_profile = false; 78 size_t Arguments::_conservative_max_heap_alignment = 0; 79 uintx Arguments::_min_heap_size = 0; 80 uintx Arguments::_min_heap_free_ratio = 0; 81 uintx Arguments::_max_heap_free_ratio = 0; 82 Arguments::Mode Arguments::_mode = _mixed; 83 bool Arguments::_java_compiler = false; 84 bool Arguments::_xdebug_mode = false; 85 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 86 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 87 int Arguments::_sun_java_launcher_pid = -1; 88 bool Arguments::_sun_java_launcher_is_altjvm = false; 89 90 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 91 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 92 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 93 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 94 bool Arguments::_ClipInlining = ClipInlining; 95 96 char* Arguments::SharedArchivePath = NULL; 97 98 AgentLibraryList Arguments::_libraryList; 99 AgentLibraryList Arguments::_agentList; 100 101 abort_hook_t Arguments::_abort_hook = NULL; 102 exit_hook_t Arguments::_exit_hook = NULL; 103 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 104 105 106 SystemProperty *Arguments::_sun_boot_library_path = NULL; 107 SystemProperty *Arguments::_java_library_path = NULL; 108 SystemProperty *Arguments::_java_home = NULL; 109 SystemProperty *Arguments::_java_class_path = NULL; 110 SystemProperty *Arguments::_sun_boot_class_path = NULL; 111 112 char* Arguments::_ext_dirs = NULL; 113 114 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 115 // part of the option string. 116 static bool match_option(const JavaVMOption *option, const char* name, 117 const char** tail) { 118 int len = (int)strlen(name); 119 if (strncmp(option->optionString, name, len) == 0) { 120 *tail = option->optionString + len; 121 return true; 122 } else { 123 return false; 124 } 125 } 126 127 // Check if 'option' matches 'name'. No "tail" is allowed. 128 static bool match_option(const JavaVMOption *option, const char* name) { 129 const char* tail = NULL; 130 bool result = match_option(option, name, &tail); 131 if (tail != NULL && *tail == '\0') { 132 return result; 133 } else { 134 return false; 135 } 136 } 137 138 // Return true if any of the strings in null-terminated array 'names' matches. 139 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 140 // the option must match exactly. 141 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 142 bool tail_allowed) { 143 for (/* empty */; *names != NULL; ++names) { 144 if (match_option(option, *names, tail)) { 145 if (**tail == '\0' || tail_allowed && **tail == ':') { 146 return true; 147 } 148 } 149 } 150 return false; 151 } 152 153 static void logOption(const char* opt) { 154 if (PrintVMOptions) { 155 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 156 } 157 } 158 159 // Process java launcher properties. 160 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 161 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 162 // sun.java.launcher.pid is defined. 163 // Must do this before setting up other system properties, 164 // as some of them may depend on launcher type. 165 for (int index = 0; index < args->nOptions; index++) { 166 const JavaVMOption* option = args->options + index; 167 const char* tail; 168 169 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 170 process_java_launcher_argument(tail, option->extraInfo); 171 continue; 172 } 173 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 174 if (strcmp(tail, "true") == 0) { 175 _sun_java_launcher_is_altjvm = true; 176 } 177 continue; 178 } 179 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 180 _sun_java_launcher_pid = atoi(tail); 181 continue; 182 } 183 } 184 } 185 186 // Initialize system properties key and value. 187 void Arguments::init_system_properties() { 188 189 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 190 "Java Virtual Machine Specification", false)); 191 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 192 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 193 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 194 195 // Following are JVMTI agent writable properties. 196 // Properties values are set to NULL and they are 197 // os specific they are initialized in os::init_system_properties_values(). 198 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 199 _java_library_path = new SystemProperty("java.library.path", NULL, true); 200 _java_home = new SystemProperty("java.home", NULL, true); 201 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 202 203 _java_class_path = new SystemProperty("java.class.path", "", true); 204 205 // Add to System Property list. 206 PropertyList_add(&_system_properties, _sun_boot_library_path); 207 PropertyList_add(&_system_properties, _java_library_path); 208 PropertyList_add(&_system_properties, _java_home); 209 PropertyList_add(&_system_properties, _java_class_path); 210 PropertyList_add(&_system_properties, _sun_boot_class_path); 211 212 // Set OS specific system properties values 213 os::init_system_properties_values(); 214 } 215 216 217 // Update/Initialize System properties after JDK version number is known 218 void Arguments::init_version_specific_system_properties() { 219 enum { bufsz = 16 }; 220 char buffer[bufsz]; 221 const char* spec_vendor = "Sun Microsystems Inc."; 222 uint32_t spec_version = 0; 223 224 spec_vendor = "Oracle Corporation"; 225 spec_version = JDK_Version::current().major_version(); 226 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 227 228 PropertyList_add(&_system_properties, 229 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 230 PropertyList_add(&_system_properties, 231 new SystemProperty("java.vm.specification.version", buffer, false)); 232 PropertyList_add(&_system_properties, 233 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 234 } 235 236 /** 237 * Provide a slightly more user-friendly way of eliminating -XX flags. 238 * When a flag is eliminated, it can be added to this list in order to 239 * continue accepting this flag on the command-line, while issuing a warning 240 * and ignoring the value. Once the JDK version reaches the 'accept_until' 241 * limit, we flatly refuse to admit the existence of the flag. This allows 242 * a flag to die correctly over JDK releases using HSX. 243 * 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(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1295 } else { 1296 FLAG_SET_ERGO(uintx, 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(uintx, NewSize, MAX2(NewSize, min_new)); 1320 FLAG_SET_ERGO(uintx, 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(uintx, 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(uintx, 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 ArgumentsExt::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 uintx 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 " UINTX_FORMAT 1782 " (" UINTX_FORMAT "G) which is greater than value given " 1783 UINTX_FORMAT "\n", 1784 DefaultHeapBaseMinAddress, 1785 DefaultHeapBaseMinAddress/G, 1786 HeapBaseMinAddress); 1787 } 1788 FLAG_SET_ERGO(uintx, 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(uintx, MaxHeapSize, (uintx)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, (uintx)reasonable_initial); 1836 } 1837 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)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((uintx)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 because we want bytecode rewriting 1852 // if the server compiler is used, or if UseSharedSpaces is disabled. 1853 void Arguments::set_bytecode_flags() { 1854 // Better not attempt to store into a read-only space. 1855 if (UseSharedSpaces) { 1856 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1857 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1858 } 1859 1860 if (!RewriteBytecodes) { 1861 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1862 } 1863 } 1864 1865 // Aggressive optimization flags -XX:+AggressiveOpts 1866 void Arguments::set_aggressive_opts_flags() { 1867 #ifdef COMPILER2 1868 if (AggressiveUnboxing) { 1869 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1870 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1871 } else if (!EliminateAutoBox) { 1872 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1873 AggressiveUnboxing = false; 1874 } 1875 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1876 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1877 } else if (!DoEscapeAnalysis) { 1878 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1879 AggressiveUnboxing = false; 1880 } 1881 } 1882 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1883 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1884 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1885 } 1886 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1887 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1888 } 1889 1890 // Feed the cache size setting into the JDK 1891 char buffer[1024]; 1892 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1893 add_property(buffer); 1894 } 1895 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1896 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1897 } 1898 #endif 1899 1900 if (AggressiveOpts) { 1901 // Sample flag setting code 1902 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1903 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1904 // } 1905 } 1906 } 1907 1908 //=========================================================================================================== 1909 // Parsing of java.compiler property 1910 1911 void Arguments::process_java_compiler_argument(char* arg) { 1912 // For backwards compatibility, Djava.compiler=NONE or "" 1913 // causes us to switch to -Xint mode UNLESS -Xdebug 1914 // is also specified. 1915 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1916 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1917 } 1918 } 1919 1920 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1921 _sun_java_launcher = os::strdup_check_oom(launcher); 1922 } 1923 1924 bool Arguments::created_by_java_launcher() { 1925 assert(_sun_java_launcher != NULL, "property must have value"); 1926 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1927 } 1928 1929 bool Arguments::sun_java_launcher_is_altjvm() { 1930 return _sun_java_launcher_is_altjvm; 1931 } 1932 1933 //=========================================================================================================== 1934 // Parsing of main arguments 1935 1936 bool Arguments::verify_interval(uintx val, uintx min, 1937 uintx max, const char* name) { 1938 // Returns true iff value is in the inclusive interval [min..max] 1939 // false, otherwise. 1940 if (val >= min && val <= max) { 1941 return true; 1942 } 1943 jio_fprintf(defaultStream::error_stream(), 1944 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1945 " and " UINTX_FORMAT "\n", 1946 name, val, min, max); 1947 return false; 1948 } 1949 1950 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1951 // Returns true if given value is at least specified min threshold 1952 // false, otherwise. 1953 if (val >= min ) { 1954 return true; 1955 } 1956 jio_fprintf(defaultStream::error_stream(), 1957 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1958 name, val, min); 1959 return false; 1960 } 1961 1962 bool Arguments::verify_percentage(uintx value, const char* name) { 1963 if (is_percentage(value)) { 1964 return true; 1965 } 1966 jio_fprintf(defaultStream::error_stream(), 1967 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1968 name, value); 1969 return false; 1970 } 1971 1972 // check if do gclog rotation 1973 // +UseGCLogFileRotation is a must, 1974 // no gc log rotation when log file not supplied or 1975 // NumberOfGCLogFiles is 0 1976 void check_gclog_consistency() { 1977 if (UseGCLogFileRotation) { 1978 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { 1979 jio_fprintf(defaultStream::output_stream(), 1980 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" 1981 "where num_of_file > 0\n" 1982 "GC log rotation is turned off\n"); 1983 UseGCLogFileRotation = false; 1984 } 1985 } 1986 1987 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { 1988 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1989 jio_fprintf(defaultStream::output_stream(), 1990 "GCLogFileSize changed to minimum 8K\n"); 1991 } 1992 } 1993 1994 // This function is called for -Xloggc:<filename>, it can be used 1995 // to check if a given file name(or string) conforms to the following 1996 // specification: 1997 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 1998 // %p and %t only allowed once. We only limit usage of filename not path 1999 bool is_filename_valid(const char *file_name) { 2000 const char* p = file_name; 2001 char file_sep = os::file_separator()[0]; 2002 const char* cp; 2003 // skip prefix path 2004 for (cp = file_name; *cp != '\0'; cp++) { 2005 if (*cp == '/' || *cp == file_sep) { 2006 p = cp + 1; 2007 } 2008 } 2009 2010 int count_p = 0; 2011 int count_t = 0; 2012 while (*p != '\0') { 2013 if ((*p >= '0' && *p <= '9') || 2014 (*p >= 'A' && *p <= 'Z') || 2015 (*p >= 'a' && *p <= 'z') || 2016 *p == '-' || 2017 *p == '_' || 2018 *p == '.') { 2019 p++; 2020 continue; 2021 } 2022 if (*p == '%') { 2023 if(*(p + 1) == 'p') { 2024 p += 2; 2025 count_p ++; 2026 continue; 2027 } 2028 if (*(p + 1) == 't') { 2029 p += 2; 2030 count_t ++; 2031 continue; 2032 } 2033 } 2034 return false; 2035 } 2036 return count_p < 2 && count_t < 2; 2037 } 2038 2039 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) { 2040 if (!is_percentage(min_heap_free_ratio)) { 2041 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100"); 2042 return false; 2043 } 2044 if (min_heap_free_ratio > MaxHeapFreeRatio) { 2045 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 2046 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio, 2047 MaxHeapFreeRatio); 2048 return false; 2049 } 2050 // This does not set the flag itself, but stores the value in a safe place for later usage. 2051 _min_heap_free_ratio = min_heap_free_ratio; 2052 return true; 2053 } 2054 2055 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) { 2056 if (!is_percentage(max_heap_free_ratio)) { 2057 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100"); 2058 return false; 2059 } 2060 if (max_heap_free_ratio < MinHeapFreeRatio) { 2061 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or " 2062 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio, 2063 MinHeapFreeRatio); 2064 return false; 2065 } 2066 // This does not set the flag itself, but stores the value in a safe place for later usage. 2067 _max_heap_free_ratio = max_heap_free_ratio; 2068 return true; 2069 } 2070 2071 // Check consistency of GC selection 2072 bool Arguments::check_gc_consistency_user() { 2073 check_gclog_consistency(); 2074 // Ensure that the user has not selected conflicting sets 2075 // of collectors. 2076 uint i = 0; 2077 if (UseSerialGC) i++; 2078 if (UseConcMarkSweepGC) i++; 2079 if (UseParallelGC || UseParallelOldGC) i++; 2080 if (UseG1GC) i++; 2081 if (i > 1) { 2082 jio_fprintf(defaultStream::error_stream(), 2083 "Conflicting collector combinations in option list; " 2084 "please refer to the release notes for the combinations " 2085 "allowed\n"); 2086 return false; 2087 } 2088 2089 if (UseConcMarkSweepGC && !UseParNewGC) { 2090 jio_fprintf(defaultStream::error_stream(), 2091 "It is not possible to combine the DefNew young collector with the CMS collector.\n"); 2092 return false; 2093 } 2094 2095 if (UseParNewGC && !UseConcMarkSweepGC) { 2096 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 2097 // set up UseSerialGC properly, so that can't be used in the check here. 2098 jio_fprintf(defaultStream::error_stream(), 2099 "It is not possible to combine the ParNew young collector with the Serial old collector.\n"); 2100 return false; 2101 } 2102 2103 return true; 2104 } 2105 2106 void Arguments::check_deprecated_gc_flags() { 2107 if (FLAG_IS_CMDLINE(UseParNewGC)) { 2108 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release"); 2109 } 2110 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 2111 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 2112 "and will likely be removed in future release"); 2113 } 2114 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 2115 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 2116 "Use MaxRAMFraction instead."); 2117 } 2118 } 2119 2120 // Check stack pages settings 2121 bool Arguments::check_stack_pages() 2122 { 2123 bool status = true; 2124 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 2125 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 2126 // greater stack shadow pages can't generate instruction to bang stack 2127 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 2128 return status; 2129 } 2130 2131 // Check the consistency of vm_init_args 2132 bool Arguments::check_vm_args_consistency() { 2133 // Method for adding checks for flag consistency. 2134 // The intent is to warn the user of all possible conflicts, 2135 // before returning an error. 2136 // Note: Needs platform-dependent factoring. 2137 bool status = true; 2138 2139 if (TLABRefillWasteFraction == 0) { 2140 jio_fprintf(defaultStream::error_stream(), 2141 "TLABRefillWasteFraction should be a denominator, " 2142 "not " SIZE_FORMAT "\n", 2143 TLABRefillWasteFraction); 2144 status = false; 2145 } 2146 2147 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 2148 "AdaptiveSizePolicyWeight"); 2149 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 2150 2151 // Divide by bucket size to prevent a large size from causing rollover when 2152 // calculating amount of memory needed to be allocated for the String table. 2153 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2154 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2155 2156 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize, 2157 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size"); 2158 2159 { 2160 // Using "else if" below to avoid printing two error messages if min > max. 2161 // This will also prevent us from reporting both min>100 and max>100 at the 2162 // same time, but that is less annoying than printing two identical errors IMHO. 2163 FormatBuffer<80> err_msg("%s",""); 2164 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) { 2165 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2166 status = false; 2167 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) { 2168 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2169 status = false; 2170 } 2171 } 2172 2173 // Min/MaxMetaspaceFreeRatio 2174 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2175 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2176 2177 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2178 jio_fprintf(defaultStream::error_stream(), 2179 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2180 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2181 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2182 MinMetaspaceFreeRatio, 2183 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2184 MaxMetaspaceFreeRatio); 2185 status = false; 2186 } 2187 2188 // Trying to keep 100% free is not practical 2189 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2190 2191 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2192 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2193 } 2194 2195 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2196 // Settings to encourage splitting. 2197 if (!FLAG_IS_CMDLINE(NewRatio)) { 2198 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2199 } 2200 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2201 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2202 } 2203 } 2204 2205 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2206 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2207 } 2208 2209 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2210 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2211 if (GCTimeLimit == 100) { 2212 // Turn off gc-overhead-limit-exceeded checks 2213 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2214 } 2215 2216 status = status && check_gc_consistency_user(); 2217 status = status && check_stack_pages(); 2218 2219 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2220 "CMSIncrementalSafetyFactor"); 2221 2222 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2223 // insists that we hold the requisite locks so that the iteration is 2224 // MT-safe. For the verification at start-up and shut-down, we don't 2225 // yet have a good way of acquiring and releasing these locks, 2226 // which are not visible at the CollectedHeap level. We want to 2227 // be able to acquire these locks and then do the iteration rather 2228 // than just disable the lock verification. This will be fixed under 2229 // bug 4788986. 2230 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2231 if (VerifyDuringStartup) { 2232 warning("Heap verification at start-up disabled " 2233 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2234 VerifyDuringStartup = false; // Disable verification at start-up 2235 } 2236 2237 if (VerifyBeforeExit) { 2238 warning("Heap verification at shutdown disabled " 2239 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2240 VerifyBeforeExit = false; // Disable verification at shutdown 2241 } 2242 } 2243 2244 // Note: only executed in non-PRODUCT mode 2245 if (!UseAsyncConcMarkSweepGC && 2246 (ExplicitGCInvokesConcurrent || 2247 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2248 jio_fprintf(defaultStream::error_stream(), 2249 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2250 " with -UseAsyncConcMarkSweepGC"); 2251 status = false; 2252 } 2253 2254 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2255 2256 #if INCLUDE_ALL_GCS 2257 if (UseG1GC) { 2258 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent"); 2259 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent"); 2260 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent"); 2261 2262 status = status && verify_percentage(G1ConfidencePercent, "G1ConfidencePercent"); 2263 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2264 "InitiatingHeapOccupancyPercent"); 2265 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2266 "G1RefProcDrainInterval"); 2267 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2268 "G1ConcMarkStepDurationMillis"); 2269 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2270 "G1ConcRSHotCardLimit"); 2271 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2272 "G1ConcRSLogCacheSize"); 2273 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age, 2274 "StringDeduplicationAgeThreshold"); 2275 } 2276 if (UseConcMarkSweepGC) { 2277 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2278 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2279 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2280 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2281 2282 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2283 2284 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2285 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2286 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2287 2288 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2289 2290 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2291 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2292 2293 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2294 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2295 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2296 2297 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2298 2299 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2300 2301 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2302 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2303 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2304 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2305 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2306 } 2307 2308 if (UseParallelGC || UseParallelOldGC) { 2309 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2310 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2311 2312 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2313 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2314 2315 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2316 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2317 2318 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2319 2320 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2321 } 2322 #endif // INCLUDE_ALL_GCS 2323 2324 status = status && verify_interval(RefDiscoveryPolicy, 2325 ReferenceProcessor::DiscoveryPolicyMin, 2326 ReferenceProcessor::DiscoveryPolicyMax, 2327 "RefDiscoveryPolicy"); 2328 2329 // Limit the lower bound of this flag to 1 as it is used in a division 2330 // expression. 2331 status = status && verify_interval(TLABWasteTargetPercent, 2332 1, 100, "TLABWasteTargetPercent"); 2333 2334 status = status && verify_object_alignment(); 2335 2336 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2337 "CompressedClassSpaceSize"); 2338 2339 status = status && verify_interval(MarkStackSizeMax, 2340 1, (max_jint - 1), "MarkStackSizeMax"); 2341 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2342 2343 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2344 2345 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2346 2347 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2348 2349 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2350 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2351 2352 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2353 2354 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2355 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2356 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2357 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2358 2359 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2360 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2361 2362 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2363 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2364 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2365 2366 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2367 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2368 2369 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold"); 2370 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold"); 2371 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2372 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2373 2374 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2375 #ifdef COMPILER1 2376 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize"); 2377 #endif 2378 status = status && verify_min_value(HeapSearchSteps, 1, "HeapSearchSteps"); 2379 2380 if (PrintNMTStatistics) { 2381 #if INCLUDE_NMT 2382 if (MemTracker::tracking_level() == NMT_off) { 2383 #endif // INCLUDE_NMT 2384 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2385 PrintNMTStatistics = false; 2386 #if INCLUDE_NMT 2387 } 2388 #endif 2389 } 2390 2391 // Need to limit the extent of the padding to reasonable size. 2392 // 8K is well beyond the reasonable HW cache line size, even with the 2393 // aggressive prefetching, while still leaving the room for segregating 2394 // among the distinct pages. 2395 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2396 jio_fprintf(defaultStream::error_stream(), 2397 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2398 ContendedPaddingWidth, 0, 8192); 2399 status = false; 2400 } 2401 2402 // Need to enforce the padding not to break the existing field alignments. 2403 // It is sufficient to check against the largest type size. 2404 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2405 jio_fprintf(defaultStream::error_stream(), 2406 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2407 ContendedPaddingWidth, BytesPerLong); 2408 status = false; 2409 } 2410 2411 // Check lower bounds of the code cache 2412 // Template Interpreter code is approximately 3X larger in debug builds. 2413 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2414 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2415 jio_fprintf(defaultStream::error_stream(), 2416 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2417 os::vm_page_size()/K); 2418 status = false; 2419 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2420 jio_fprintf(defaultStream::error_stream(), 2421 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2422 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2423 status = false; 2424 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2425 jio_fprintf(defaultStream::error_stream(), 2426 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2427 min_code_cache_size/K); 2428 status = false; 2429 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2430 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2431 jio_fprintf(defaultStream::error_stream(), 2432 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2433 CODE_CACHE_SIZE_LIMIT/M); 2434 status = false; 2435 } else if (NonNMethodCodeHeapSize < min_code_cache_size){ 2436 jio_fprintf(defaultStream::error_stream(), 2437 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2438 min_code_cache_size/K); 2439 status = false; 2440 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) 2441 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 2442 jio_fprintf(defaultStream::error_stream(), 2443 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 2444 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 2445 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 2446 status = false; 2447 } 2448 2449 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); 2450 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength"); 2451 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize"); 2452 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt"); 2453 2454 2455 int min_number_of_compiler_threads = get_min_number_of_compiler_threads(); 2456 // The default CICompilerCount's value is CI_COMPILER_COUNT. 2457 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number"); 2458 // Check the minimum number of compiler threads 2459 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount"); 2460 2461 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2462 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2463 } 2464 2465 return status; 2466 } 2467 2468 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2469 const char* option_type) { 2470 if (ignore) return false; 2471 2472 const char* spacer = " "; 2473 if (option_type == NULL) { 2474 option_type = ++spacer; // Set both to the empty string. 2475 } 2476 2477 if (os::obsolete_option(option)) { 2478 jio_fprintf(defaultStream::error_stream(), 2479 "Obsolete %s%soption: %s\n", option_type, spacer, 2480 option->optionString); 2481 return false; 2482 } else { 2483 jio_fprintf(defaultStream::error_stream(), 2484 "Unrecognized %s%soption: %s\n", option_type, spacer, 2485 option->optionString); 2486 return true; 2487 } 2488 } 2489 2490 static const char* user_assertion_options[] = { 2491 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2492 }; 2493 2494 static const char* system_assertion_options[] = { 2495 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2496 }; 2497 2498 bool Arguments::parse_uintx(const char* value, 2499 uintx* uintx_arg, 2500 uintx min_size) { 2501 2502 // Check the sign first since atomull() parses only unsigned values. 2503 bool value_is_positive = !(*value == '-'); 2504 2505 if (value_is_positive) { 2506 julong n; 2507 bool good_return = atomull(value, &n); 2508 if (good_return) { 2509 bool above_minimum = n >= min_size; 2510 bool value_is_too_large = n > max_uintx; 2511 2512 if (above_minimum && !value_is_too_large) { 2513 *uintx_arg = n; 2514 return true; 2515 } 2516 } 2517 } 2518 return false; 2519 } 2520 2521 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2522 julong* long_arg, 2523 julong min_size) { 2524 if (!atomull(s, long_arg)) return arg_unreadable; 2525 return check_memory_size(*long_arg, min_size); 2526 } 2527 2528 // Parse JavaVMInitArgs structure 2529 2530 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2531 // For components of the system classpath. 2532 SysClassPath scp(Arguments::get_sysclasspath()); 2533 bool scp_assembly_required = false; 2534 2535 // Save default settings for some mode flags 2536 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2537 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2538 Arguments::_ClipInlining = ClipInlining; 2539 Arguments::_BackgroundCompilation = BackgroundCompilation; 2540 2541 // Setup flags for mixed which is the default 2542 set_mode_flags(_mixed); 2543 2544 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2545 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2546 if (result != JNI_OK) { 2547 return result; 2548 } 2549 2550 // Parse JavaVMInitArgs structure passed in 2551 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE); 2552 if (result != JNI_OK) { 2553 return result; 2554 } 2555 2556 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2557 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2558 if (result != JNI_OK) { 2559 return result; 2560 } 2561 2562 // Do final processing now that all arguments have been parsed 2563 result = finalize_vm_init_args(&scp, scp_assembly_required); 2564 if (result != JNI_OK) { 2565 return result; 2566 } 2567 2568 return JNI_OK; 2569 } 2570 2571 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2572 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2573 // are dealing with -agentpath (case where name is a path), otherwise with 2574 // -agentlib 2575 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2576 char *_name; 2577 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2578 size_t _len_hprof, _len_jdwp, _len_prefix; 2579 2580 if (is_path) { 2581 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2582 return false; 2583 } 2584 2585 _name++; // skip past last path separator 2586 _len_prefix = strlen(JNI_LIB_PREFIX); 2587 2588 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2589 return false; 2590 } 2591 2592 _name += _len_prefix; 2593 _len_hprof = strlen(_hprof); 2594 _len_jdwp = strlen(_jdwp); 2595 2596 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2597 _name += _len_hprof; 2598 } 2599 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2600 _name += _len_jdwp; 2601 } 2602 else { 2603 return false; 2604 } 2605 2606 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2607 return false; 2608 } 2609 2610 return true; 2611 } 2612 2613 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2614 return true; 2615 } 2616 2617 return false; 2618 } 2619 2620 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2621 SysClassPath* scp_p, 2622 bool* scp_assembly_required_p, 2623 Flag::Flags origin) { 2624 // Remaining part of option string 2625 const char* tail; 2626 2627 // iterate over arguments 2628 for (int index = 0; index < args->nOptions; index++) { 2629 bool is_absolute_path = false; // for -agentpath vs -agentlib 2630 2631 const JavaVMOption* option = args->options + index; 2632 2633 if (!match_option(option, "-Djava.class.path", &tail) && 2634 !match_option(option, "-Dsun.java.command", &tail) && 2635 !match_option(option, "-Dsun.java.launcher", &tail)) { 2636 2637 // add all jvm options to the jvm_args string. This string 2638 // is used later to set the java.vm.args PerfData string constant. 2639 // the -Djava.class.path and the -Dsun.java.command options are 2640 // omitted from jvm_args string as each have their own PerfData 2641 // string constant object. 2642 build_jvm_args(option->optionString); 2643 } 2644 2645 // -verbose:[class/gc/jni] 2646 if (match_option(option, "-verbose", &tail)) { 2647 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2648 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2649 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2650 } else if (!strcmp(tail, ":gc")) { 2651 FLAG_SET_CMDLINE(bool, PrintGC, true); 2652 } else if (!strcmp(tail, ":jni")) { 2653 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2654 } 2655 // -da / -ea / -disableassertions / -enableassertions 2656 // These accept an optional class/package name separated by a colon, e.g., 2657 // -da:java.lang.Thread. 2658 } else if (match_option(option, user_assertion_options, &tail, true)) { 2659 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2660 if (*tail == '\0') { 2661 JavaAssertions::setUserClassDefault(enable); 2662 } else { 2663 assert(*tail == ':', "bogus match by match_option()"); 2664 JavaAssertions::addOption(tail + 1, enable); 2665 } 2666 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2667 } else if (match_option(option, system_assertion_options, &tail, false)) { 2668 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2669 JavaAssertions::setSystemClassDefault(enable); 2670 // -bootclasspath: 2671 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2672 scp_p->reset_path(tail); 2673 *scp_assembly_required_p = true; 2674 // -bootclasspath/a: 2675 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2676 scp_p->add_suffix(tail); 2677 *scp_assembly_required_p = true; 2678 // -bootclasspath/p: 2679 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2680 scp_p->add_prefix(tail); 2681 *scp_assembly_required_p = true; 2682 // -Xrun 2683 } else if (match_option(option, "-Xrun", &tail)) { 2684 if (tail != NULL) { 2685 const char* pos = strchr(tail, ':'); 2686 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2687 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2688 name[len] = '\0'; 2689 2690 char *options = NULL; 2691 if(pos != NULL) { 2692 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2693 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2694 } 2695 #if !INCLUDE_JVMTI 2696 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2697 jio_fprintf(defaultStream::error_stream(), 2698 "Profiling and debugging agents are not supported in this VM\n"); 2699 return JNI_ERR; 2700 } 2701 #endif // !INCLUDE_JVMTI 2702 add_init_library(name, options); 2703 } 2704 // -agentlib and -agentpath 2705 } else if (match_option(option, "-agentlib:", &tail) || 2706 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2707 if(tail != NULL) { 2708 const char* pos = strchr(tail, '='); 2709 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2710 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2711 name[len] = '\0'; 2712 2713 char *options = NULL; 2714 if(pos != NULL) { 2715 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2716 } 2717 #if !INCLUDE_JVMTI 2718 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2719 jio_fprintf(defaultStream::error_stream(), 2720 "Profiling and debugging agents are not supported in this VM\n"); 2721 return JNI_ERR; 2722 } 2723 #endif // !INCLUDE_JVMTI 2724 add_init_agent(name, options, is_absolute_path); 2725 } 2726 // -javaagent 2727 } else if (match_option(option, "-javaagent:", &tail)) { 2728 #if !INCLUDE_JVMTI 2729 jio_fprintf(defaultStream::error_stream(), 2730 "Instrumentation agents are not supported in this VM\n"); 2731 return JNI_ERR; 2732 #else 2733 if(tail != NULL) { 2734 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2735 add_init_agent("instrument", options, false); 2736 } 2737 #endif // !INCLUDE_JVMTI 2738 // -Xnoclassgc 2739 } else if (match_option(option, "-Xnoclassgc")) { 2740 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2741 // -Xconcgc 2742 } else if (match_option(option, "-Xconcgc")) { 2743 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2744 // -Xnoconcgc 2745 } else if (match_option(option, "-Xnoconcgc")) { 2746 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2747 // -Xbatch 2748 } else if (match_option(option, "-Xbatch")) { 2749 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2750 // -Xmn for compatibility with other JVM vendors 2751 } else if (match_option(option, "-Xmn", &tail)) { 2752 julong long_initial_young_size = 0; 2753 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2754 if (errcode != arg_in_range) { 2755 jio_fprintf(defaultStream::error_stream(), 2756 "Invalid initial young generation size: %s\n", option->optionString); 2757 describe_range_error(errcode); 2758 return JNI_EINVAL; 2759 } 2760 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size); 2761 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size); 2762 // -Xms 2763 } else if (match_option(option, "-Xms", &tail)) { 2764 julong long_initial_heap_size = 0; 2765 // an initial heap size of 0 means automatically determine 2766 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2767 if (errcode != arg_in_range) { 2768 jio_fprintf(defaultStream::error_stream(), 2769 "Invalid initial heap size: %s\n", option->optionString); 2770 describe_range_error(errcode); 2771 return JNI_EINVAL; 2772 } 2773 set_min_heap_size((uintx)long_initial_heap_size); 2774 // Currently the minimum size and the initial heap sizes are the same. 2775 // Can be overridden with -XX:InitialHeapSize. 2776 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2777 // -Xmx 2778 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2779 julong long_max_heap_size = 0; 2780 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2781 if (errcode != arg_in_range) { 2782 jio_fprintf(defaultStream::error_stream(), 2783 "Invalid maximum heap size: %s\n", option->optionString); 2784 describe_range_error(errcode); 2785 return JNI_EINVAL; 2786 } 2787 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2788 // Xmaxf 2789 } else if (match_option(option, "-Xmaxf", &tail)) { 2790 char* err; 2791 int maxf = (int)(strtod(tail, &err) * 100); 2792 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) { 2793 jio_fprintf(defaultStream::error_stream(), 2794 "Bad max heap free percentage size: %s\n", 2795 option->optionString); 2796 return JNI_EINVAL; 2797 } else { 2798 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2799 } 2800 // Xminf 2801 } else if (match_option(option, "-Xminf", &tail)) { 2802 char* err; 2803 int minf = (int)(strtod(tail, &err) * 100); 2804 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) { 2805 jio_fprintf(defaultStream::error_stream(), 2806 "Bad min heap free percentage size: %s\n", 2807 option->optionString); 2808 return JNI_EINVAL; 2809 } else { 2810 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2811 } 2812 // -Xss 2813 } else if (match_option(option, "-Xss", &tail)) { 2814 julong long_ThreadStackSize = 0; 2815 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2816 if (errcode != arg_in_range) { 2817 jio_fprintf(defaultStream::error_stream(), 2818 "Invalid thread stack size: %s\n", option->optionString); 2819 describe_range_error(errcode); 2820 return JNI_EINVAL; 2821 } 2822 // Internally track ThreadStackSize in units of 1024 bytes. 2823 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2824 round_to((int)long_ThreadStackSize, K) / K); 2825 // -Xoss 2826 } else if (match_option(option, "-Xoss", &tail)) { 2827 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2828 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2829 julong long_CodeCacheExpansionSize = 0; 2830 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2831 if (errcode != arg_in_range) { 2832 jio_fprintf(defaultStream::error_stream(), 2833 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2834 os::vm_page_size()/K); 2835 return JNI_EINVAL; 2836 } 2837 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2838 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2839 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2840 julong long_ReservedCodeCacheSize = 0; 2841 2842 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2843 if (errcode != arg_in_range) { 2844 jio_fprintf(defaultStream::error_stream(), 2845 "Invalid maximum code cache size: %s.\n", option->optionString); 2846 return JNI_EINVAL; 2847 } 2848 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2849 // -XX:NonNMethodCodeHeapSize= 2850 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 2851 julong long_NonNMethodCodeHeapSize = 0; 2852 2853 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 2854 if (errcode != arg_in_range) { 2855 jio_fprintf(defaultStream::error_stream(), 2856 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 2857 return JNI_EINVAL; 2858 } 2859 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize); 2860 // -XX:ProfiledCodeHeapSize= 2861 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 2862 julong long_ProfiledCodeHeapSize = 0; 2863 2864 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 2865 if (errcode != arg_in_range) { 2866 jio_fprintf(defaultStream::error_stream(), 2867 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 2868 return JNI_EINVAL; 2869 } 2870 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize); 2871 // -XX:NonProfiledCodeHeapSizee= 2872 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 2873 julong long_NonProfiledCodeHeapSize = 0; 2874 2875 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 2876 if (errcode != arg_in_range) { 2877 jio_fprintf(defaultStream::error_stream(), 2878 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 2879 return JNI_EINVAL; 2880 } 2881 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize); 2882 //-XX:IncreaseFirstTierCompileThresholdAt= 2883 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2884 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2885 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2886 jio_fprintf(defaultStream::error_stream(), 2887 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2888 option->optionString); 2889 return JNI_EINVAL; 2890 } 2891 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2892 // -green 2893 } else if (match_option(option, "-green")) { 2894 jio_fprintf(defaultStream::error_stream(), 2895 "Green threads support not available\n"); 2896 return JNI_EINVAL; 2897 // -native 2898 } else if (match_option(option, "-native")) { 2899 // HotSpot always uses native threads, ignore silently for compatibility 2900 // -Xsqnopause 2901 } else if (match_option(option, "-Xsqnopause")) { 2902 // EVM option, ignore silently for compatibility 2903 // -Xrs 2904 } else if (match_option(option, "-Xrs")) { 2905 // Classic/EVM option, new functionality 2906 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2907 } else if (match_option(option, "-Xusealtsigs")) { 2908 // change default internal VM signals used - lower case for back compat 2909 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2910 // -Xoptimize 2911 } else if (match_option(option, "-Xoptimize")) { 2912 // EVM option, ignore silently for compatibility 2913 // -Xprof 2914 } else if (match_option(option, "-Xprof")) { 2915 #if INCLUDE_FPROF 2916 _has_profile = true; 2917 #else // INCLUDE_FPROF 2918 jio_fprintf(defaultStream::error_stream(), 2919 "Flat profiling is not supported in this VM.\n"); 2920 return JNI_ERR; 2921 #endif // INCLUDE_FPROF 2922 // -Xconcurrentio 2923 } else if (match_option(option, "-Xconcurrentio")) { 2924 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2925 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2926 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2927 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2928 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2929 2930 // -Xinternalversion 2931 } else if (match_option(option, "-Xinternalversion")) { 2932 jio_fprintf(defaultStream::output_stream(), "%s\n", 2933 VM_Version::internal_vm_info_string()); 2934 vm_exit(0); 2935 #ifndef PRODUCT 2936 // -Xprintflags 2937 } else if (match_option(option, "-Xprintflags")) { 2938 CommandLineFlags::printFlags(tty, false); 2939 vm_exit(0); 2940 #endif 2941 // -D 2942 } else if (match_option(option, "-D", &tail)) { 2943 const char* value; 2944 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2945 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2946 // abort if -Djava.endorsed.dirs is set 2947 jio_fprintf(defaultStream::output_stream(), 2948 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2949 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2950 return JNI_EINVAL; 2951 } 2952 if (match_option(option, "-Djava.ext.dirs=", &value) && 2953 *value != '\0' && strcmp(value, "\"\"") != 0) { 2954 // abort if -Djava.ext.dirs is set 2955 jio_fprintf(defaultStream::output_stream(), 2956 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2957 return JNI_EINVAL; 2958 } 2959 2960 if (!add_property(tail)) { 2961 return JNI_ENOMEM; 2962 } 2963 // Out of the box management support 2964 if (match_option(option, "-Dcom.sun.management", &tail)) { 2965 #if INCLUDE_MANAGEMENT 2966 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2967 #else 2968 jio_fprintf(defaultStream::output_stream(), 2969 "-Dcom.sun.management is not supported in this VM.\n"); 2970 return JNI_ERR; 2971 #endif 2972 } 2973 // -Xint 2974 } else if (match_option(option, "-Xint")) { 2975 set_mode_flags(_int); 2976 // -Xmixed 2977 } else if (match_option(option, "-Xmixed")) { 2978 set_mode_flags(_mixed); 2979 // -Xcomp 2980 } else if (match_option(option, "-Xcomp")) { 2981 // for testing the compiler; turn off all flags that inhibit compilation 2982 set_mode_flags(_comp); 2983 // -Xshare:dump 2984 } else if (match_option(option, "-Xshare:dump")) { 2985 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2986 set_mode_flags(_int); // Prevent compilation, which creates objects 2987 // -Xshare:on 2988 } else if (match_option(option, "-Xshare:on")) { 2989 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2990 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2991 // -Xshare:auto 2992 } else if (match_option(option, "-Xshare:auto")) { 2993 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2994 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2995 // -Xshare:off 2996 } else if (match_option(option, "-Xshare:off")) { 2997 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2998 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2999 // -Xverify 3000 } else if (match_option(option, "-Xverify", &tail)) { 3001 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3002 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 3003 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3004 } else if (strcmp(tail, ":remote") == 0) { 3005 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3006 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3007 } else if (strcmp(tail, ":none") == 0) { 3008 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3009 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 3010 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3011 return JNI_EINVAL; 3012 } 3013 // -Xdebug 3014 } else if (match_option(option, "-Xdebug")) { 3015 // note this flag has been used, then ignore 3016 set_xdebug_mode(true); 3017 // -Xnoagent 3018 } else if (match_option(option, "-Xnoagent")) { 3019 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3020 } else if (match_option(option, "-Xboundthreads")) { 3021 // Bind user level threads to kernel threads (Solaris only) 3022 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 3023 } else if (match_option(option, "-Xloggc:", &tail)) { 3024 // Redirect GC output to the file. -Xloggc:<filename> 3025 // ostream_init_log(), when called will use this filename 3026 // to initialize a fileStream. 3027 _gc_log_filename = os::strdup_check_oom(tail); 3028 if (!is_filename_valid(_gc_log_filename)) { 3029 jio_fprintf(defaultStream::output_stream(), 3030 "Invalid file name for use with -Xloggc: Filename can only contain the " 3031 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 3032 "Note %%p or %%t can only be used once\n", _gc_log_filename); 3033 return JNI_EINVAL; 3034 } 3035 FLAG_SET_CMDLINE(bool, PrintGC, true); 3036 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 3037 3038 // JNI hooks 3039 } else if (match_option(option, "-Xcheck", &tail)) { 3040 if (!strcmp(tail, ":jni")) { 3041 #if !INCLUDE_JNI_CHECK 3042 warning("JNI CHECKING is not supported in this VM"); 3043 #else 3044 CheckJNICalls = true; 3045 #endif // INCLUDE_JNI_CHECK 3046 } else if (is_bad_option(option, args->ignoreUnrecognized, 3047 "check")) { 3048 return JNI_EINVAL; 3049 } 3050 } else if (match_option(option, "vfprintf")) { 3051 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3052 } else if (match_option(option, "exit")) { 3053 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3054 } else if (match_option(option, "abort")) { 3055 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3056 // -XX:+AggressiveHeap 3057 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3058 3059 // This option inspects the machine and attempts to set various 3060 // parameters to be optimal for long-running, memory allocation 3061 // intensive jobs. It is intended for machines with large 3062 // amounts of cpu and memory. 3063 3064 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 3065 // VM, but we may not be able to represent the total physical memory 3066 // available (like having 8gb of memory on a box but using a 32bit VM). 3067 // Thus, we need to make sure we're using a julong for intermediate 3068 // calculations. 3069 julong initHeapSize; 3070 julong total_memory = os::physical_memory(); 3071 3072 if (total_memory < (julong)256*M) { 3073 jio_fprintf(defaultStream::error_stream(), 3074 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 3075 vm_exit(1); 3076 } 3077 3078 // The heap size is half of available memory, or (at most) 3079 // all of possible memory less 160mb (leaving room for the OS 3080 // when using ISM). This is the maximum; because adaptive sizing 3081 // is turned on below, the actual space used may be smaller. 3082 3083 initHeapSize = MIN2(total_memory / (julong)2, 3084 total_memory - (julong)160*M); 3085 3086 initHeapSize = limit_by_allocatable_memory(initHeapSize); 3087 3088 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 3089 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 3090 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 3091 // Currently the minimum size and the initial heap sizes are the same. 3092 set_min_heap_size(initHeapSize); 3093 } 3094 if (FLAG_IS_DEFAULT(NewSize)) { 3095 // Make the young generation 3/8ths of the total heap. 3096 FLAG_SET_CMDLINE(uintx, NewSize, 3097 ((julong)MaxHeapSize / (julong)8) * (julong)3); 3098 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 3099 } 3100 3101 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3102 FLAG_SET_DEFAULT(UseLargePages, true); 3103 #endif 3104 3105 // Increase some data structure sizes for efficiency 3106 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 3107 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3108 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 3109 3110 // See the OldPLABSize comment below, but replace 'after promotion' 3111 // with 'after copying'. YoungPLABSize is the size of the survivor 3112 // space per-gc-thread buffers. The default is 4kw. 3113 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 3114 3115 // OldPLABSize is the size of the buffers in the old gen that 3116 // UseParallelGC uses to promote live data that doesn't fit in the 3117 // survivor spaces. At any given time, there's one for each gc thread. 3118 // The default size is 1kw. These buffers are rarely used, since the 3119 // survivor spaces are usually big enough. For specjbb, however, there 3120 // are occasions when there's lots of live data in the young gen 3121 // and we end up promoting some of it. We don't have a definite 3122 // explanation for why bumping OldPLABSize helps, but the theory 3123 // is that a bigger PLAB results in retaining something like the 3124 // original allocation order after promotion, which improves mutator 3125 // locality. A minor effect may be that larger PLABs reduce the 3126 // number of PLAB allocation events during gc. The value of 8kw 3127 // was arrived at by experimenting with specjbb. 3128 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 3129 3130 // Enable parallel GC and adaptive generation sizing 3131 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 3132 FLAG_SET_DEFAULT(ParallelGCThreads, 3133 Abstract_VM_Version::parallel_worker_threads()); 3134 3135 // Encourage steady state memory management 3136 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 3137 3138 // This appears to improve mutator locality 3139 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3140 3141 // Get around early Solaris scheduling bug 3142 // (affinity vs other jobs on system) 3143 // but disallow DR and offlining (5008695). 3144 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 3145 3146 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3147 // and the last option wins. 3148 } else if (match_option(option, "-XX:+NeverTenure")) { 3149 FLAG_SET_CMDLINE(bool, NeverTenure, true); 3150 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3151 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1); 3152 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3153 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3154 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3155 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 3156 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3157 uintx max_tenuring_thresh = 0; 3158 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3159 jio_fprintf(defaultStream::error_stream(), 3160 "Invalid MaxTenuringThreshold: %s\n", option->optionString); 3161 } 3162 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh); 3163 3164 if (MaxTenuringThreshold == 0) { 3165 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3166 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3167 } else { 3168 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3169 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3170 } 3171 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3172 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3173 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3174 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3175 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3176 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3177 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3178 #if defined(DTRACE_ENABLED) 3179 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3180 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3181 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3182 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3183 #else // defined(DTRACE_ENABLED) 3184 jio_fprintf(defaultStream::error_stream(), 3185 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3186 return JNI_EINVAL; 3187 #endif // defined(DTRACE_ENABLED) 3188 #ifdef ASSERT 3189 } else if (match_option(option, "-XX:+FullGCALot")) { 3190 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3191 // disable scavenge before parallel mark-compact 3192 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3193 #endif 3194 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3195 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3196 julong stack_size = 0; 3197 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3198 if (errcode != arg_in_range) { 3199 jio_fprintf(defaultStream::error_stream(), 3200 "Invalid mark stack size: %s\n", option->optionString); 3201 describe_range_error(errcode); 3202 return JNI_EINVAL; 3203 } 3204 jio_fprintf(defaultStream::error_stream(), 3205 "Please use -XX:MarkStackSize in place of " 3206 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n"); 3207 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3208 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3209 julong max_stack_size = 0; 3210 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3211 if (errcode != arg_in_range) { 3212 jio_fprintf(defaultStream::error_stream(), 3213 "Invalid maximum mark stack size: %s\n", 3214 option->optionString); 3215 describe_range_error(errcode); 3216 return JNI_EINVAL; 3217 } 3218 jio_fprintf(defaultStream::error_stream(), 3219 "Please use -XX:MarkStackSizeMax in place of " 3220 "-XX:CMSMarkStackSizeMax in the future\n"); 3221 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3222 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3223 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3224 uintx conc_threads = 0; 3225 if (!parse_uintx(tail, &conc_threads, 1)) { 3226 jio_fprintf(defaultStream::error_stream(), 3227 "Invalid concurrent threads: %s\n", option->optionString); 3228 return JNI_EINVAL; 3229 } 3230 jio_fprintf(defaultStream::error_stream(), 3231 "Please use -XX:ConcGCThreads in place of " 3232 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n"); 3233 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3234 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3235 julong max_direct_memory_size = 0; 3236 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3237 if (errcode != arg_in_range) { 3238 jio_fprintf(defaultStream::error_stream(), 3239 "Invalid maximum direct memory size: %s\n", 3240 option->optionString); 3241 describe_range_error(errcode); 3242 return JNI_EINVAL; 3243 } 3244 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3245 #if !INCLUDE_MANAGEMENT 3246 } else if (match_option(option, "-XX:+ManagementServer")) { 3247 jio_fprintf(defaultStream::error_stream(), 3248 "ManagementServer is not supported in this VM.\n"); 3249 return JNI_ERR; 3250 #endif // INCLUDE_MANAGEMENT 3251 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3252 // Skip -XX:Flags= since that case has already been handled 3253 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3254 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3255 return JNI_EINVAL; 3256 } 3257 } 3258 // Unknown option 3259 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3260 return JNI_ERR; 3261 } 3262 } 3263 3264 // PrintSharedArchiveAndExit will turn on 3265 // -Xshare:on 3266 // -XX:+TraceClassPaths 3267 if (PrintSharedArchiveAndExit) { 3268 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3269 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3270 FLAG_SET_CMDLINE(bool, TraceClassPaths, true); 3271 } 3272 3273 // Change the default value for flags which have different default values 3274 // when working with older JDKs. 3275 #ifdef LINUX 3276 if (JDK_Version::current().compare_major(6) <= 0 && 3277 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3278 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3279 } 3280 #endif // LINUX 3281 fix_appclasspath(); 3282 return JNI_OK; 3283 } 3284 3285 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3286 // 3287 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3288 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3289 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3290 // path is treated as the current directory. 3291 // 3292 // This causes problems with CDS, which requires that all directories specified in the classpath 3293 // must be empty. In most cases, applications do NOT want to load classes from the current 3294 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3295 // scripts compatible with CDS. 3296 void Arguments::fix_appclasspath() { 3297 if (IgnoreEmptyClassPaths) { 3298 const char separator = *os::path_separator(); 3299 const char* src = _java_class_path->value(); 3300 3301 // skip over all the leading empty paths 3302 while (*src == separator) { 3303 src ++; 3304 } 3305 3306 char* copy = AllocateHeap(strlen(src) + 1, mtInternal); 3307 strncpy(copy, src, strlen(src) + 1); 3308 3309 // trim all trailing empty paths 3310 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3311 *tail = '\0'; 3312 } 3313 3314 char from[3] = {separator, separator, '\0'}; 3315 char to [2] = {separator, '\0'}; 3316 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3317 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3318 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3319 } 3320 3321 _java_class_path->set_value(copy); 3322 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3323 } 3324 3325 if (!PrintSharedArchiveAndExit) { 3326 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value()); 3327 } 3328 } 3329 3330 static bool has_jar_files(const char* directory) { 3331 DIR* dir = os::opendir(directory); 3332 if (dir == NULL) return false; 3333 3334 struct dirent *entry; 3335 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 3336 bool hasJarFile = false; 3337 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3338 const char* name = entry->d_name; 3339 const char* ext = name + strlen(name) - 4; 3340 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3341 } 3342 FREE_C_HEAP_ARRAY(char, dbuf); 3343 os::closedir(dir); 3344 return hasJarFile ; 3345 } 3346 3347 static int check_non_empty_dirs(const char* path) { 3348 const char separator = *os::path_separator(); 3349 const char* const end = path + strlen(path); 3350 int nonEmptyDirs = 0; 3351 while (path < end) { 3352 const char* tmp_end = strchr(path, separator); 3353 if (tmp_end == NULL) { 3354 if (has_jar_files(path)) { 3355 nonEmptyDirs++; 3356 jio_fprintf(defaultStream::output_stream(), 3357 "Non-empty directory: %s\n", path); 3358 } 3359 path = end; 3360 } else { 3361 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 3362 memcpy(dirpath, path, tmp_end - path); 3363 dirpath[tmp_end - path] = '\0'; 3364 if (has_jar_files(dirpath)) { 3365 nonEmptyDirs++; 3366 jio_fprintf(defaultStream::output_stream(), 3367 "Non-empty directory: %s\n", dirpath); 3368 } 3369 FREE_C_HEAP_ARRAY(char, dirpath); 3370 path = tmp_end + 1; 3371 } 3372 } 3373 return nonEmptyDirs; 3374 } 3375 3376 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3377 // check if the default lib/endorsed directory exists; if so, error 3378 char path[JVM_MAXPATHLEN]; 3379 const char* fileSep = os::file_separator(); 3380 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3381 3382 if (CheckEndorsedAndExtDirs) { 3383 int nonEmptyDirs = 0; 3384 // check endorsed directory 3385 nonEmptyDirs += check_non_empty_dirs(path); 3386 // check the extension directories 3387 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3388 if (nonEmptyDirs > 0) { 3389 return JNI_ERR; 3390 } 3391 } 3392 3393 DIR* dir = os::opendir(path); 3394 if (dir != NULL) { 3395 jio_fprintf(defaultStream::output_stream(), 3396 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3397 "in modular form will be supported via the concept of upgradeable modules.\n"); 3398 os::closedir(dir); 3399 return JNI_ERR; 3400 } 3401 3402 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3403 dir = os::opendir(path); 3404 if (dir != NULL) { 3405 jio_fprintf(defaultStream::output_stream(), 3406 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3407 "Use -classpath instead.\n."); 3408 os::closedir(dir); 3409 return JNI_ERR; 3410 } 3411 3412 if (scp_assembly_required) { 3413 // Assemble the bootclasspath elements into the final path. 3414 Arguments::set_sysclasspath(scp_p->combined_path()); 3415 } 3416 3417 // This must be done after all arguments have been processed. 3418 // java_compiler() true means set to "NONE" or empty. 3419 if (java_compiler() && !xdebug_mode()) { 3420 // For backwards compatibility, we switch to interpreted mode if 3421 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3422 // not specified. 3423 set_mode_flags(_int); 3424 } 3425 3426 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3427 // but like -Xint, leave compilation thresholds unaffected. 3428 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3429 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3430 set_mode_flags(_int); 3431 } 3432 3433 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3434 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3435 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3436 } 3437 3438 #ifndef COMPILER2 3439 // Don't degrade server performance for footprint 3440 if (FLAG_IS_DEFAULT(UseLargePages) && 3441 MaxHeapSize < LargePageHeapSizeThreshold) { 3442 // No need for large granularity pages w/small heaps. 3443 // Note that large pages are enabled/disabled for both the 3444 // Java heap and the code cache. 3445 FLAG_SET_DEFAULT(UseLargePages, false); 3446 } 3447 3448 #else 3449 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3450 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3451 } 3452 #endif 3453 3454 #ifndef TIERED 3455 // Tiered compilation is undefined. 3456 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3457 #endif 3458 3459 // If we are running in a headless jre, force java.awt.headless property 3460 // to be true unless the property has already been set. 3461 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3462 if (os::is_headless_jre()) { 3463 const char* headless = Arguments::get_property("java.awt.headless"); 3464 if (headless == NULL) { 3465 char envbuffer[128]; 3466 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3467 if (!add_property("java.awt.headless=true")) { 3468 return JNI_ENOMEM; 3469 } 3470 } else { 3471 char buffer[256]; 3472 strcpy(buffer, "java.awt.headless="); 3473 strcat(buffer, envbuffer); 3474 if (!add_property(buffer)) { 3475 return JNI_ENOMEM; 3476 } 3477 } 3478 } 3479 } 3480 3481 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) { 3482 // CMS can only be used with ParNew 3483 FLAG_SET_ERGO(bool, UseParNewGC, true); 3484 } 3485 3486 if (!check_vm_args_consistency()) { 3487 return JNI_ERR; 3488 } 3489 3490 return JNI_OK; 3491 } 3492 3493 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3494 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3495 scp_assembly_required_p); 3496 } 3497 3498 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3499 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3500 scp_assembly_required_p); 3501 } 3502 3503 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3504 const int N_MAX_OPTIONS = 64; 3505 const int OPTION_BUFFER_SIZE = 1024; 3506 char buffer[OPTION_BUFFER_SIZE]; 3507 3508 // The variable will be ignored if it exceeds the length of the buffer. 3509 // Don't check this variable if user has special privileges 3510 // (e.g. unix su command). 3511 if (os::getenv(name, buffer, sizeof(buffer)) && 3512 !os::have_special_privileges()) { 3513 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3514 jio_fprintf(defaultStream::error_stream(), 3515 "Picked up %s: %s\n", name, buffer); 3516 char* rd = buffer; // pointer to the input string (rd) 3517 int i; 3518 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3519 while (isspace(*rd)) rd++; // skip whitespace 3520 if (*rd == 0) break; // we re done when the input string is read completely 3521 3522 // The output, option string, overwrites the input string. 3523 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3524 // input string (rd). 3525 char* wrt = rd; 3526 3527 options[i++].optionString = wrt; // Fill in option 3528 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3529 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3530 int quote = *rd; // matching quote to look for 3531 rd++; // don't copy open quote 3532 while (*rd != quote) { // include everything (even spaces) up until quote 3533 if (*rd == 0) { // string termination means unmatched string 3534 jio_fprintf(defaultStream::error_stream(), 3535 "Unmatched quote in %s\n", name); 3536 return JNI_ERR; 3537 } 3538 *wrt++ = *rd++; // copy to option string 3539 } 3540 rd++; // don't copy close quote 3541 } else { 3542 *wrt++ = *rd++; // copy to option string 3543 } 3544 } 3545 // Need to check if we're done before writing a NULL, 3546 // because the write could be to the byte that rd is pointing to. 3547 if (*rd++ == 0) { 3548 *wrt = 0; 3549 break; 3550 } 3551 *wrt = 0; // Zero terminate option 3552 } 3553 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3554 JavaVMInitArgs vm_args; 3555 vm_args.version = JNI_VERSION_1_2; 3556 vm_args.options = options; 3557 vm_args.nOptions = i; 3558 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3559 3560 if (PrintVMOptions) { 3561 const char* tail; 3562 for (int i = 0; i < vm_args.nOptions; i++) { 3563 const JavaVMOption *option = vm_args.options + i; 3564 if (match_option(option, "-XX:", &tail)) { 3565 logOption(tail); 3566 } 3567 } 3568 } 3569 3570 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR)); 3571 } 3572 return JNI_OK; 3573 } 3574 3575 void Arguments::set_shared_spaces_flags() { 3576 if (DumpSharedSpaces) { 3577 if (RequireSharedSpaces) { 3578 warning("cannot dump shared archive while using shared archive"); 3579 } 3580 UseSharedSpaces = false; 3581 #ifdef _LP64 3582 if (!UseCompressedOops || !UseCompressedClassPointers) { 3583 vm_exit_during_initialization( 3584 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3585 } 3586 } else { 3587 if (!UseCompressedOops || !UseCompressedClassPointers) { 3588 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3589 } 3590 #endif 3591 } 3592 } 3593 3594 #if !INCLUDE_ALL_GCS 3595 static void force_serial_gc() { 3596 FLAG_SET_DEFAULT(UseSerialGC, true); 3597 UNSUPPORTED_GC_OPTION(UseG1GC); 3598 UNSUPPORTED_GC_OPTION(UseParallelGC); 3599 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3600 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3601 UNSUPPORTED_GC_OPTION(UseParNewGC); 3602 } 3603 #endif // INCLUDE_ALL_GCS 3604 3605 // Sharing support 3606 // Construct the path to the archive 3607 static char* get_shared_archive_path() { 3608 char *shared_archive_path; 3609 if (SharedArchiveFile == NULL) { 3610 char jvm_path[JVM_MAXPATHLEN]; 3611 os::jvm_path(jvm_path, sizeof(jvm_path)); 3612 char *end = strrchr(jvm_path, *os::file_separator()); 3613 if (end != NULL) *end = '\0'; 3614 size_t jvm_path_len = strlen(jvm_path); 3615 size_t file_sep_len = strlen(os::file_separator()); 3616 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3617 file_sep_len + 20, mtInternal); 3618 if (shared_archive_path != NULL) { 3619 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3620 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3621 strncat(shared_archive_path, "classes.jsa", 11); 3622 } 3623 } else { 3624 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3625 if (shared_archive_path != NULL) { 3626 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3627 } 3628 } 3629 return shared_archive_path; 3630 } 3631 3632 #ifndef PRODUCT 3633 // Determine whether LogVMOutput should be implicitly turned on. 3634 static bool use_vm_log() { 3635 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3636 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3637 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3638 PrintAssembly || TraceDeoptimization || TraceDependencies || 3639 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3640 return true; 3641 } 3642 3643 #ifdef COMPILER1 3644 if (PrintC1Statistics) { 3645 return true; 3646 } 3647 #endif // COMPILER1 3648 3649 #ifdef COMPILER2 3650 if (PrintOptoAssembly || PrintOptoStatistics) { 3651 return true; 3652 } 3653 #endif // COMPILER2 3654 3655 return false; 3656 } 3657 #endif // PRODUCT 3658 3659 // Parse entry point called from JNI_CreateJavaVM 3660 3661 jint Arguments::parse(const JavaVMInitArgs* args) { 3662 3663 // Remaining part of option string 3664 const char* tail; 3665 3666 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3667 const char* hotspotrc = ".hotspotrc"; 3668 bool settings_file_specified = false; 3669 bool needs_hotspotrc_warning = false; 3670 3671 const char* flags_file; 3672 int index; 3673 for (index = 0; index < args->nOptions; index++) { 3674 const JavaVMOption *option = args->options + index; 3675 if (ArgumentsExt::process_options(option)) { 3676 continue; 3677 } 3678 if (match_option(option, "-XX:Flags=", &tail)) { 3679 flags_file = tail; 3680 settings_file_specified = true; 3681 continue; 3682 } 3683 if (match_option(option, "-XX:+PrintVMOptions")) { 3684 PrintVMOptions = true; 3685 continue; 3686 } 3687 if (match_option(option, "-XX:-PrintVMOptions")) { 3688 PrintVMOptions = false; 3689 continue; 3690 } 3691 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3692 IgnoreUnrecognizedVMOptions = true; 3693 continue; 3694 } 3695 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3696 IgnoreUnrecognizedVMOptions = false; 3697 continue; 3698 } 3699 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3700 CommandLineFlags::printFlags(tty, false); 3701 vm_exit(0); 3702 } 3703 #if INCLUDE_NMT 3704 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3705 // The launcher did not setup nmt environment variable properly. 3706 if (!MemTracker::check_launcher_nmt_support(tail)) { 3707 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3708 } 3709 3710 // Verify if nmt option is valid. 3711 if (MemTracker::verify_nmt_option()) { 3712 // Late initialization, still in single-threaded mode. 3713 if (MemTracker::tracking_level() >= NMT_summary) { 3714 MemTracker::init(); 3715 } 3716 } else { 3717 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3718 } 3719 continue; 3720 } 3721 #endif 3722 3723 3724 #ifndef PRODUCT 3725 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3726 CommandLineFlags::printFlags(tty, true); 3727 vm_exit(0); 3728 } 3729 #endif 3730 } 3731 3732 if (IgnoreUnrecognizedVMOptions) { 3733 // uncast const to modify the flag args->ignoreUnrecognized 3734 *(jboolean*)(&args->ignoreUnrecognized) = true; 3735 } 3736 3737 // Parse specified settings file 3738 if (settings_file_specified) { 3739 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3740 return JNI_EINVAL; 3741 } 3742 } else { 3743 #ifdef ASSERT 3744 // Parse default .hotspotrc settings file 3745 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3746 return JNI_EINVAL; 3747 } 3748 #else 3749 struct stat buf; 3750 if (os::stat(hotspotrc, &buf) == 0) { 3751 needs_hotspotrc_warning = true; 3752 } 3753 #endif 3754 } 3755 3756 if (PrintVMOptions) { 3757 for (index = 0; index < args->nOptions; index++) { 3758 const JavaVMOption *option = args->options + index; 3759 if (match_option(option, "-XX:", &tail)) { 3760 logOption(tail); 3761 } 3762 } 3763 } 3764 3765 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3766 jint result = parse_vm_init_args(args); 3767 if (result != JNI_OK) { 3768 return result; 3769 } 3770 3771 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3772 SharedArchivePath = get_shared_archive_path(); 3773 if (SharedArchivePath == NULL) { 3774 return JNI_ENOMEM; 3775 } 3776 3777 // Set up VerifySharedSpaces 3778 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 3779 VerifySharedSpaces = true; 3780 } 3781 3782 // Delay warning until here so that we've had a chance to process 3783 // the -XX:-PrintWarnings flag 3784 if (needs_hotspotrc_warning) { 3785 warning("%s file is present but has been ignored. " 3786 "Run with -XX:Flags=%s to load the file.", 3787 hotspotrc, hotspotrc); 3788 } 3789 3790 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3791 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3792 #endif 3793 3794 ArgumentsExt::report_unsupported_options(); 3795 3796 #ifndef PRODUCT 3797 if (TraceBytecodesAt != 0) { 3798 TraceBytecodes = true; 3799 } 3800 if (CountCompiledCalls) { 3801 if (UseCounterDecay) { 3802 warning("UseCounterDecay disabled because CountCalls is set"); 3803 UseCounterDecay = false; 3804 } 3805 } 3806 #endif // PRODUCT 3807 3808 if (ScavengeRootsInCode == 0) { 3809 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3810 warning("forcing ScavengeRootsInCode non-zero"); 3811 } 3812 ScavengeRootsInCode = 1; 3813 } 3814 3815 if (PrintGCDetails) { 3816 // Turn on -verbose:gc options as well 3817 PrintGC = true; 3818 } 3819 3820 // Set object alignment values. 3821 set_object_alignment(); 3822 3823 #if !INCLUDE_ALL_GCS 3824 force_serial_gc(); 3825 #endif // INCLUDE_ALL_GCS 3826 #if !INCLUDE_CDS 3827 if (DumpSharedSpaces || RequireSharedSpaces) { 3828 jio_fprintf(defaultStream::error_stream(), 3829 "Shared spaces are not supported in this VM\n"); 3830 return JNI_ERR; 3831 } 3832 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3833 warning("Shared spaces are not supported in this VM"); 3834 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3835 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3836 } 3837 no_shared_spaces("CDS Disabled"); 3838 #endif // INCLUDE_CDS 3839 3840 return JNI_OK; 3841 } 3842 3843 jint Arguments::apply_ergo() { 3844 3845 // Set flags based on ergonomics. 3846 set_ergonomics_flags(); 3847 3848 set_shared_spaces_flags(); 3849 3850 // Check the GC selections again. 3851 if (!ArgumentsExt::check_gc_consistency_ergo()) { 3852 return JNI_EINVAL; 3853 } 3854 3855 if (TieredCompilation) { 3856 set_tiered_flags(); 3857 } else { 3858 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3859 if (CompilationPolicyChoice >= 2) { 3860 vm_exit_during_initialization( 3861 "Incompatible compilation policy selected", NULL); 3862 } 3863 // Scale CompileThreshold 3864 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 3865 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 3866 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 3867 } 3868 } 3869 3870 #ifdef COMPILER2 3871 #ifndef PRODUCT 3872 if (PrintIdealGraphLevel > 0) { 3873 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 3874 } 3875 #endif 3876 #endif 3877 3878 // Set heap size based on available physical memory 3879 set_heap_size(); 3880 3881 ArgumentsExt::set_gc_specific_flags(); 3882 3883 // Initialize Metaspace flags and alignments 3884 Metaspace::ergo_initialize(); 3885 3886 // Set bytecode rewriting flags 3887 set_bytecode_flags(); 3888 3889 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 3890 set_aggressive_opts_flags(); 3891 3892 // Turn off biased locking for locking debug mode flags, 3893 // which are subtly different from each other but neither works with 3894 // biased locking 3895 if (UseHeavyMonitors 3896 #ifdef COMPILER1 3897 || !UseFastLocking 3898 #endif // COMPILER1 3899 ) { 3900 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3901 // flag set to true on command line; warn the user that they 3902 // can't enable biased locking here 3903 warning("Biased Locking is not supported with locking debug flags" 3904 "; ignoring UseBiasedLocking flag." ); 3905 } 3906 UseBiasedLocking = false; 3907 } 3908 3909 #ifdef ZERO 3910 // Clear flags not supported on zero. 3911 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3912 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3913 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3914 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3915 #endif // CC_INTERP 3916 3917 #ifdef COMPILER2 3918 if (!EliminateLocks) { 3919 EliminateNestedLocks = false; 3920 } 3921 if (!Inline) { 3922 IncrementalInline = false; 3923 } 3924 #ifndef PRODUCT 3925 if (!IncrementalInline) { 3926 AlwaysIncrementalInline = false; 3927 } 3928 #endif 3929 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 3930 // nothing to use the profiling, turn if off 3931 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 3932 } 3933 #endif 3934 3935 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3936 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3937 DebugNonSafepoints = true; 3938 } 3939 3940 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3941 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3942 } 3943 3944 #ifndef PRODUCT 3945 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3946 if (use_vm_log()) { 3947 LogVMOutput = true; 3948 } 3949 } 3950 #endif // PRODUCT 3951 3952 if (PrintCommandLineFlags) { 3953 CommandLineFlags::printSetFlags(tty); 3954 } 3955 3956 // Apply CPU specific policy for the BiasedLocking 3957 if (UseBiasedLocking) { 3958 if (!VM_Version::use_biased_locking() && 3959 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3960 UseBiasedLocking = false; 3961 } 3962 } 3963 #ifdef COMPILER2 3964 if (!UseBiasedLocking || EmitSync != 0) { 3965 UseOptoBiasInlining = false; 3966 } 3967 #endif 3968 3969 return JNI_OK; 3970 } 3971 3972 jint Arguments::adjust_after_os() { 3973 if (UseNUMA) { 3974 if (UseParallelGC || UseParallelOldGC) { 3975 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3976 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3977 } 3978 } 3979 // UseNUMAInterleaving is set to ON for all collectors and 3980 // platforms when UseNUMA is set to ON. NUMA-aware collectors 3981 // such as the parallel collector for Linux and Solaris will 3982 // interleave old gen and survivor spaces on top of NUMA 3983 // allocation policy for the eden space. 3984 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 3985 // all platforms and ParallelGC on Windows will interleave all 3986 // of the heap spaces across NUMA nodes. 3987 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 3988 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 3989 } 3990 } 3991 return JNI_OK; 3992 } 3993 3994 int Arguments::PropertyList_count(SystemProperty* pl) { 3995 int count = 0; 3996 while(pl != NULL) { 3997 count++; 3998 pl = pl->next(); 3999 } 4000 return count; 4001 } 4002 4003 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4004 assert(key != NULL, "just checking"); 4005 SystemProperty* prop; 4006 for (prop = pl; prop != NULL; prop = prop->next()) { 4007 if (strcmp(key, prop->key()) == 0) return prop->value(); 4008 } 4009 return NULL; 4010 } 4011 4012 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4013 int count = 0; 4014 const char* ret_val = NULL; 4015 4016 while(pl != NULL) { 4017 if(count >= index) { 4018 ret_val = pl->key(); 4019 break; 4020 } 4021 count++; 4022 pl = pl->next(); 4023 } 4024 4025 return ret_val; 4026 } 4027 4028 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4029 int count = 0; 4030 char* ret_val = NULL; 4031 4032 while(pl != NULL) { 4033 if(count >= index) { 4034 ret_val = pl->value(); 4035 break; 4036 } 4037 count++; 4038 pl = pl->next(); 4039 } 4040 4041 return ret_val; 4042 } 4043 4044 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4045 SystemProperty* p = *plist; 4046 if (p == NULL) { 4047 *plist = new_p; 4048 } else { 4049 while (p->next() != NULL) { 4050 p = p->next(); 4051 } 4052 p->set_next(new_p); 4053 } 4054 } 4055 4056 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 4057 if (plist == NULL) 4058 return; 4059 4060 SystemProperty* new_p = new SystemProperty(k, v, true); 4061 PropertyList_add(plist, new_p); 4062 } 4063 4064 void Arguments::PropertyList_add(SystemProperty *element) { 4065 PropertyList_add(&_system_properties, element); 4066 } 4067 4068 // This add maintains unique property key in the list. 4069 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 4070 if (plist == NULL) 4071 return; 4072 4073 // If property key exist then update with new value. 4074 SystemProperty* prop; 4075 for (prop = *plist; prop != NULL; prop = prop->next()) { 4076 if (strcmp(k, prop->key()) == 0) { 4077 if (append) { 4078 prop->append_value(v); 4079 } else { 4080 prop->set_value(v); 4081 } 4082 return; 4083 } 4084 } 4085 4086 PropertyList_add(plist, k, v); 4087 } 4088 4089 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4090 // Returns true if all of the source pointed by src has been copied over to 4091 // the destination buffer pointed by buf. Otherwise, returns false. 4092 // Notes: 4093 // 1. If the length (buflen) of the destination buffer excluding the 4094 // NULL terminator character is not long enough for holding the expanded 4095 // pid characters, it also returns false instead of returning the partially 4096 // expanded one. 4097 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4098 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4099 char* buf, size_t buflen) { 4100 const char* p = src; 4101 char* b = buf; 4102 const char* src_end = &src[srclen]; 4103 char* buf_end = &buf[buflen - 1]; 4104 4105 while (p < src_end && b < buf_end) { 4106 if (*p == '%') { 4107 switch (*(++p)) { 4108 case '%': // "%%" ==> "%" 4109 *b++ = *p++; 4110 break; 4111 case 'p': { // "%p" ==> current process id 4112 // buf_end points to the character before the last character so 4113 // that we could write '\0' to the end of the buffer. 4114 size_t buf_sz = buf_end - b + 1; 4115 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4116 4117 // if jio_snprintf fails or the buffer is not long enough to hold 4118 // the expanded pid, returns false. 4119 if (ret < 0 || ret >= (int)buf_sz) { 4120 return false; 4121 } else { 4122 b += ret; 4123 assert(*b == '\0', "fail in copy_expand_pid"); 4124 if (p == src_end && b == buf_end + 1) { 4125 // reach the end of the buffer. 4126 return true; 4127 } 4128 } 4129 p++; 4130 break; 4131 } 4132 default : 4133 *b++ = '%'; 4134 } 4135 } else { 4136 *b++ = *p++; 4137 } 4138 } 4139 *b = '\0'; 4140 return (p == src_end); // return false if not all of the source was copied 4141 }