1 /* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoader.hpp" 27 #include "classfile/javaAssertions.hpp" 28 #include "classfile/stringTable.hpp" 29 #include "classfile/symbolTable.hpp" 30 #include "compiler/compilerOracle.hpp" 31 #include "gc/shared/cardTableRS.hpp" 32 #include "gc/shared/genCollectedHeap.hpp" 33 #include "gc/shared/referenceProcessor.hpp" 34 #include "gc/shared/taskqueue.hpp" 35 #include "memory/allocation.inline.hpp" 36 #include "memory/universe.inline.hpp" 37 #include "oops/oop.inline.hpp" 38 #include "prims/jvmtiExport.hpp" 39 #include "runtime/arguments.hpp" 40 #include "runtime/arguments_ext.hpp" 41 #include "runtime/globals_extension.hpp" 42 #include "runtime/java.hpp" 43 #include "runtime/os.hpp" 44 #include "runtime/vm_version.hpp" 45 #include "services/management.hpp" 46 #include "services/memTracker.hpp" 47 #include "utilities/defaultStream.hpp" 48 #include "utilities/macros.hpp" 49 #include "utilities/stringUtils.hpp" 50 #if INCLUDE_ALL_GCS 51 #include "gc/cms/compactibleFreeListSpace.hpp" 52 #include "gc/g1/g1CollectedHeap.inline.hpp" 53 #include "gc/parallel/parallelScavengeHeap.hpp" 54 #endif // INCLUDE_ALL_GCS 55 56 // Note: This is a special bug reporting site for the JVM 57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 58 #define DEFAULT_JAVA_LAUNCHER "generic" 59 60 #define UNSUPPORTED_GC_OPTION(gc) \ 61 do { \ 62 if (gc) { \ 63 if (FLAG_IS_CMDLINE(gc)) { \ 64 warning(#gc " is not supported in this VM. Using Serial GC."); \ 65 } \ 66 FLAG_SET_DEFAULT(gc, false); \ 67 } \ 68 } while(0) 69 70 char** Arguments::_jvm_flags_array = NULL; 71 int Arguments::_num_jvm_flags = 0; 72 char** Arguments::_jvm_args_array = NULL; 73 int Arguments::_num_jvm_args = 0; 74 char* Arguments::_java_command = NULL; 75 SystemProperty* Arguments::_system_properties = NULL; 76 const char* Arguments::_gc_log_filename = NULL; 77 bool Arguments::_has_profile = false; 78 size_t Arguments::_conservative_max_heap_alignment = 0; 79 size_t Arguments::_min_heap_size = 0; 80 uintx Arguments::_min_heap_free_ratio = 0; 81 uintx Arguments::_max_heap_free_ratio = 0; 82 Arguments::Mode Arguments::_mode = _mixed; 83 bool Arguments::_java_compiler = false; 84 bool Arguments::_xdebug_mode = false; 85 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 86 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 87 int Arguments::_sun_java_launcher_pid = -1; 88 bool Arguments::_sun_java_launcher_is_altjvm = false; 89 90 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 91 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 92 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 93 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 94 bool Arguments::_ClipInlining = ClipInlining; 95 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 96 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 97 98 char* Arguments::SharedArchivePath = NULL; 99 100 AgentLibraryList Arguments::_libraryList; 101 AgentLibraryList Arguments::_agentList; 102 103 abort_hook_t Arguments::_abort_hook = NULL; 104 exit_hook_t Arguments::_exit_hook = NULL; 105 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 106 107 108 SystemProperty *Arguments::_sun_boot_library_path = NULL; 109 SystemProperty *Arguments::_java_library_path = NULL; 110 SystemProperty *Arguments::_java_home = NULL; 111 SystemProperty *Arguments::_java_class_path = NULL; 112 SystemProperty *Arguments::_sun_boot_class_path = NULL; 113 114 char* Arguments::_ext_dirs = NULL; 115 116 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 117 // part of the option string. 118 static bool match_option(const JavaVMOption *option, const char* name, 119 const char** tail) { 120 int len = (int)strlen(name); 121 if (strncmp(option->optionString, name, len) == 0) { 122 *tail = option->optionString + len; 123 return true; 124 } else { 125 return false; 126 } 127 } 128 129 // Check if 'option' matches 'name'. No "tail" is allowed. 130 static bool match_option(const JavaVMOption *option, const char* name) { 131 const char* tail = NULL; 132 bool result = match_option(option, name, &tail); 133 if (tail != NULL && *tail == '\0') { 134 return result; 135 } else { 136 return false; 137 } 138 } 139 140 // Return true if any of the strings in null-terminated array 'names' matches. 141 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 142 // the option must match exactly. 143 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 144 bool tail_allowed) { 145 for (/* empty */; *names != NULL; ++names) { 146 if (match_option(option, *names, tail)) { 147 if (**tail == '\0' || tail_allowed && **tail == ':') { 148 return true; 149 } 150 } 151 } 152 return false; 153 } 154 155 static void logOption(const char* opt) { 156 if (PrintVMOptions) { 157 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 158 } 159 } 160 161 // Process java launcher properties. 162 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 163 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 164 // sun.java.launcher.pid is defined. 165 // Must do this before setting up other system properties, 166 // as some of them may depend on launcher type. 167 for (int index = 0; index < args->nOptions; index++) { 168 const JavaVMOption* option = args->options + index; 169 const char* tail; 170 171 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 172 process_java_launcher_argument(tail, option->extraInfo); 173 continue; 174 } 175 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 176 if (strcmp(tail, "true") == 0) { 177 _sun_java_launcher_is_altjvm = true; 178 } 179 continue; 180 } 181 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 182 _sun_java_launcher_pid = atoi(tail); 183 continue; 184 } 185 } 186 } 187 188 // Initialize system properties key and value. 189 void Arguments::init_system_properties() { 190 191 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 192 "Java Virtual Machine Specification", false)); 193 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 194 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 195 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 196 197 // Following are JVMTI agent writable properties. 198 // Properties values are set to NULL and they are 199 // os specific they are initialized in os::init_system_properties_values(). 200 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 201 _java_library_path = new SystemProperty("java.library.path", NULL, true); 202 _java_home = new SystemProperty("java.home", NULL, true); 203 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 204 205 _java_class_path = new SystemProperty("java.class.path", "", true); 206 207 // Add to System Property list. 208 PropertyList_add(&_system_properties, _sun_boot_library_path); 209 PropertyList_add(&_system_properties, _java_library_path); 210 PropertyList_add(&_system_properties, _java_home); 211 PropertyList_add(&_system_properties, _java_class_path); 212 PropertyList_add(&_system_properties, _sun_boot_class_path); 213 214 // Set OS specific system properties values 215 os::init_system_properties_values(); 216 } 217 218 219 // Update/Initialize System properties after JDK version number is known 220 void Arguments::init_version_specific_system_properties() { 221 enum { bufsz = 16 }; 222 char buffer[bufsz]; 223 const char* spec_vendor = "Sun Microsystems Inc."; 224 uint32_t spec_version = 0; 225 226 spec_vendor = "Oracle Corporation"; 227 spec_version = JDK_Version::current().major_version(); 228 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 229 230 PropertyList_add(&_system_properties, 231 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 232 PropertyList_add(&_system_properties, 233 new SystemProperty("java.vm.specification.version", buffer, false)); 234 PropertyList_add(&_system_properties, 235 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 236 } 237 238 /** 239 * Provide a slightly more user-friendly way of eliminating -XX flags. 240 * When a flag is eliminated, it can be added to this list in order to 241 * continue accepting this flag on the command-line, while issuing a warning 242 * and ignoring the value. Once the JDK version reaches the 'accept_until' 243 * limit, we flatly refuse to admit the existence of the flag. This allows 244 * a flag to die correctly over JDK releases using HSX. 245 * But now that HSX is no longer supported only options with a future 246 * accept_until value need to be listed, and the list can be pruned 247 * on each major release. 248 */ 249 typedef struct { 250 const char* name; 251 JDK_Version obsoleted_in; // when the flag went away 252 JDK_Version accept_until; // which version to start denying the existence 253 } ObsoleteFlag; 254 255 static ObsoleteFlag obsolete_jvm_flags[] = { 256 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 257 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 258 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 259 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 260 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 261 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 262 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 263 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) }, 264 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 265 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 266 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 267 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 268 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 269 #ifndef ZERO 270 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 271 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 272 #endif // ZERO 273 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 274 { "AdaptiveSizePausePolicy", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 275 { "ParallelGCRetainPLAB", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 276 { NULL, JDK_Version(0), JDK_Version(0) } 277 }; 278 279 // Returns true if the flag is obsolete and fits into the range specified 280 // for being ignored. In the case that the flag is ignored, the 'version' 281 // value is filled in with the version number when the flag became 282 // obsolete so that that value can be displayed to the user. 283 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 284 int i = 0; 285 assert(version != NULL, "Must provide a version buffer"); 286 while (obsolete_jvm_flags[i].name != NULL) { 287 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 288 // <flag>=xxx form 289 // [-|+]<flag> form 290 size_t len = strlen(flag_status.name); 291 if ((strncmp(flag_status.name, s, len) == 0) && 292 (strlen(s) == len)){ 293 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 294 *version = flag_status.obsoleted_in; 295 return true; 296 } 297 } 298 i++; 299 } 300 return false; 301 } 302 303 // Constructs the system class path (aka boot class path) from the following 304 // components, in order: 305 // 306 // prefix // from -Xbootclasspath/p:... 307 // base // from os::get_system_properties() or -Xbootclasspath= 308 // suffix // from -Xbootclasspath/a:... 309 // 310 // This could be AllStatic, but it isn't needed after argument processing is 311 // complete. 312 class SysClassPath: public StackObj { 313 public: 314 SysClassPath(const char* base); 315 ~SysClassPath(); 316 317 inline void set_base(const char* base); 318 inline void add_prefix(const char* prefix); 319 inline void add_suffix_to_prefix(const char* suffix); 320 inline void add_suffix(const char* suffix); 321 inline void reset_path(const char* base); 322 323 inline const char* get_base() const { return _items[_scp_base]; } 324 inline const char* get_prefix() const { return _items[_scp_prefix]; } 325 inline const char* get_suffix() const { return _items[_scp_suffix]; } 326 327 // Combine all the components into a single c-heap-allocated string; caller 328 // must free the string if/when no longer needed. 329 char* combined_path(); 330 331 private: 332 // Utility routines. 333 static char* add_to_path(const char* path, const char* str, bool prepend); 334 static char* add_jars_to_path(char* path, const char* directory); 335 336 inline void reset_item_at(int index); 337 338 // Array indices for the items that make up the sysclasspath. All except the 339 // base are allocated in the C heap and freed by this class. 340 enum { 341 _scp_prefix, // from -Xbootclasspath/p:... 342 _scp_base, // the default sysclasspath 343 _scp_suffix, // from -Xbootclasspath/a:... 344 _scp_nitems // the number of items, must be last. 345 }; 346 347 const char* _items[_scp_nitems]; 348 }; 349 350 SysClassPath::SysClassPath(const char* base) { 351 memset(_items, 0, sizeof(_items)); 352 _items[_scp_base] = base; 353 } 354 355 SysClassPath::~SysClassPath() { 356 // Free everything except the base. 357 for (int i = 0; i < _scp_nitems; ++i) { 358 if (i != _scp_base) reset_item_at(i); 359 } 360 } 361 362 inline void SysClassPath::set_base(const char* base) { 363 _items[_scp_base] = base; 364 } 365 366 inline void SysClassPath::add_prefix(const char* prefix) { 367 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 368 } 369 370 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 371 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 372 } 373 374 inline void SysClassPath::add_suffix(const char* suffix) { 375 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 376 } 377 378 inline void SysClassPath::reset_item_at(int index) { 379 assert(index < _scp_nitems && index != _scp_base, "just checking"); 380 if (_items[index] != NULL) { 381 FREE_C_HEAP_ARRAY(char, _items[index]); 382 _items[index] = NULL; 383 } 384 } 385 386 inline void SysClassPath::reset_path(const char* base) { 387 // Clear the prefix and suffix. 388 reset_item_at(_scp_prefix); 389 reset_item_at(_scp_suffix); 390 set_base(base); 391 } 392 393 //------------------------------------------------------------------------------ 394 395 396 // Combine the bootclasspath elements, some of which may be null, into a single 397 // c-heap-allocated string. 398 char* SysClassPath::combined_path() { 399 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 400 401 size_t lengths[_scp_nitems]; 402 size_t total_len = 0; 403 404 const char separator = *os::path_separator(); 405 406 // Get the lengths. 407 int i; 408 for (i = 0; i < _scp_nitems; ++i) { 409 if (_items[i] != NULL) { 410 lengths[i] = strlen(_items[i]); 411 // Include space for the separator char (or a NULL for the last item). 412 total_len += lengths[i] + 1; 413 } 414 } 415 assert(total_len > 0, "empty sysclasspath not allowed"); 416 417 // Copy the _items to a single string. 418 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 419 char* cp_tmp = cp; 420 for (i = 0; i < _scp_nitems; ++i) { 421 if (_items[i] != NULL) { 422 memcpy(cp_tmp, _items[i], lengths[i]); 423 cp_tmp += lengths[i]; 424 *cp_tmp++ = separator; 425 } 426 } 427 *--cp_tmp = '\0'; // Replace the extra separator. 428 return cp; 429 } 430 431 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 432 char* 433 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 434 char *cp; 435 436 assert(str != NULL, "just checking"); 437 if (path == NULL) { 438 size_t len = strlen(str) + 1; 439 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 440 memcpy(cp, str, len); // copy the trailing null 441 } else { 442 const char separator = *os::path_separator(); 443 size_t old_len = strlen(path); 444 size_t str_len = strlen(str); 445 size_t len = old_len + str_len + 2; 446 447 if (prepend) { 448 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 449 char* cp_tmp = cp; 450 memcpy(cp_tmp, str, str_len); 451 cp_tmp += str_len; 452 *cp_tmp = separator; 453 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 454 FREE_C_HEAP_ARRAY(char, path); 455 } else { 456 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 457 char* cp_tmp = cp + old_len; 458 *cp_tmp = separator; 459 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 460 } 461 } 462 return cp; 463 } 464 465 // Scan the directory and append any jar or zip files found to path. 466 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 467 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 468 DIR* dir = os::opendir(directory); 469 if (dir == NULL) return path; 470 471 char dir_sep[2] = { '\0', '\0' }; 472 size_t directory_len = strlen(directory); 473 const char fileSep = *os::file_separator(); 474 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 475 476 /* Scan the directory for jars/zips, appending them to path. */ 477 struct dirent *entry; 478 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 479 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 480 const char* name = entry->d_name; 481 const char* ext = name + strlen(name) - 4; 482 bool isJarOrZip = ext > name && 483 (os::file_name_strcmp(ext, ".jar") == 0 || 484 os::file_name_strcmp(ext, ".zip") == 0); 485 if (isJarOrZip) { 486 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 487 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 488 path = add_to_path(path, jarpath, false); 489 FREE_C_HEAP_ARRAY(char, jarpath); 490 } 491 } 492 FREE_C_HEAP_ARRAY(char, dbuf); 493 os::closedir(dir); 494 return path; 495 } 496 497 // Parses a memory size specification string. 498 static bool atomull(const char *s, julong* result) { 499 julong n = 0; 500 int args_read = 0; 501 bool is_hex = false; 502 // Skip leading 0[xX] for hexadecimal 503 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) { 504 s += 2; 505 is_hex = true; 506 args_read = sscanf(s, JULONG_FORMAT_X, &n); 507 } else { 508 args_read = sscanf(s, JULONG_FORMAT, &n); 509 } 510 if (args_read != 1) { 511 return false; 512 } 513 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) { 514 s++; 515 } 516 // 4705540: illegal if more characters are found after the first non-digit 517 if (strlen(s) > 1) { 518 return false; 519 } 520 switch (*s) { 521 case 'T': case 't': 522 *result = n * G * K; 523 // Check for overflow. 524 if (*result/((julong)G * K) != n) return false; 525 return true; 526 case 'G': case 'g': 527 *result = n * G; 528 if (*result/G != n) return false; 529 return true; 530 case 'M': case 'm': 531 *result = n * M; 532 if (*result/M != n) return false; 533 return true; 534 case 'K': case 'k': 535 *result = n * K; 536 if (*result/K != n) return false; 537 return true; 538 case '\0': 539 *result = n; 540 return true; 541 default: 542 return false; 543 } 544 } 545 546 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 547 if (size < min_size) return arg_too_small; 548 // Check that size will fit in a size_t (only relevant on 32-bit) 549 if (size > max_uintx) return arg_too_big; 550 return arg_in_range; 551 } 552 553 // Describe an argument out of range error 554 void Arguments::describe_range_error(ArgsRange errcode) { 555 switch(errcode) { 556 case arg_too_big: 557 jio_fprintf(defaultStream::error_stream(), 558 "The specified size exceeds the maximum " 559 "representable size.\n"); 560 break; 561 case arg_too_small: 562 case arg_unreadable: 563 case arg_in_range: 564 // do nothing for now 565 break; 566 default: 567 ShouldNotReachHere(); 568 } 569 } 570 571 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) { 572 return CommandLineFlags::boolAtPut(name, &value, origin); 573 } 574 575 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 576 double v; 577 if (sscanf(value, "%lf", &v) != 1) { 578 return false; 579 } 580 581 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 582 return true; 583 } 584 return false; 585 } 586 587 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 588 julong v; 589 int int_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) && !CommandLineFlags::intAt(name, &int_v)) { 595 return false; 596 } 597 value++; 598 is_neg = true; 599 } 600 if (!atomull(value, &v)) { 601 return false; 602 } 603 int_v = (int) v; 604 if (is_neg) { 605 int_v = -int_v; 606 } 607 if (CommandLineFlags::intAtPut(name, &int_v, origin)) { 608 return true; 609 } 610 uint uint_v = (uint) v; 611 if (!is_neg && CommandLineFlags::uintAtPut(name, &uint_v, origin)) { 612 return true; 613 } 614 intx_v = (intx) v; 615 if (is_neg) { 616 intx_v = -intx_v; 617 } 618 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 619 return true; 620 } 621 uintx uintx_v = (uintx) v; 622 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 623 return true; 624 } 625 uint64_t uint64_t_v = (uint64_t) v; 626 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 627 return true; 628 } 629 size_t size_t_v = (size_t) v; 630 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) { 631 return true; 632 } 633 return false; 634 } 635 636 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 637 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 638 // Contract: CommandLineFlags always returns a pointer that needs freeing. 639 FREE_C_HEAP_ARRAY(char, value); 640 return true; 641 } 642 643 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 644 const char* old_value = ""; 645 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 646 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 647 size_t new_len = strlen(new_value); 648 const char* value; 649 char* free_this_too = NULL; 650 if (old_len == 0) { 651 value = new_value; 652 } else if (new_len == 0) { 653 value = old_value; 654 } else { 655 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 656 // each new setting adds another LINE to the switch: 657 sprintf(buf, "%s\n%s", old_value, new_value); 658 value = buf; 659 free_this_too = buf; 660 } 661 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 662 // CommandLineFlags always returns a pointer that needs freeing. 663 FREE_C_HEAP_ARRAY(char, value); 664 if (free_this_too != NULL) { 665 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 666 FREE_C_HEAP_ARRAY(char, free_this_too); 667 } 668 return true; 669 } 670 671 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 672 673 // range of acceptable characters spelled out for portability reasons 674 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 675 #define BUFLEN 255 676 char name[BUFLEN+1]; 677 char dummy; 678 679 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 680 return set_bool_flag(name, false, origin); 681 } 682 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 683 return set_bool_flag(name, true, origin); 684 } 685 686 char punct; 687 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 688 const char* value = strchr(arg, '=') + 1; 689 Flag* flag = Flag::find_flag(name, strlen(name)); 690 if (flag != NULL && flag->is_ccstr()) { 691 if (flag->ccstr_accumulates()) { 692 return append_to_string_flag(name, value, origin); 693 } else { 694 if (value[0] == '\0') { 695 value = NULL; 696 } 697 return set_string_flag(name, value, origin); 698 } 699 } 700 } 701 702 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 703 const char* value = strchr(arg, '=') + 1; 704 // -XX:Foo:=xxx will reset the string flag to the given value. 705 if (value[0] == '\0') { 706 value = NULL; 707 } 708 return set_string_flag(name, value, origin); 709 } 710 711 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 712 #define SIGNED_NUMBER_RANGE "[-0123456789]" 713 #define NUMBER_RANGE "[0123456789]" 714 char value[BUFLEN + 1]; 715 char value2[BUFLEN + 1]; 716 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 717 // Looks like a floating-point number -- try again with more lenient format string 718 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 719 return set_fp_numeric_flag(name, value, origin); 720 } 721 } 722 723 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 724 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 725 return set_numeric_flag(name, value, origin); 726 } 727 728 return false; 729 } 730 731 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 732 assert(bldarray != NULL, "illegal argument"); 733 734 if (arg == NULL) { 735 return; 736 } 737 738 int new_count = *count + 1; 739 740 // expand the array and add arg to the last element 741 if (*bldarray == NULL) { 742 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 743 } else { 744 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 745 } 746 (*bldarray)[*count] = os::strdup_check_oom(arg); 747 *count = new_count; 748 } 749 750 void Arguments::build_jvm_args(const char* arg) { 751 add_string(&_jvm_args_array, &_num_jvm_args, arg); 752 } 753 754 void Arguments::build_jvm_flags(const char* arg) { 755 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 756 } 757 758 // utility function to return a string that concatenates all 759 // strings in a given char** array 760 const char* Arguments::build_resource_string(char** args, int count) { 761 if (args == NULL || count == 0) { 762 return NULL; 763 } 764 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 765 for (int i = 1; i < count; i++) { 766 length += strlen(args[i]) + 1; // add 1 for a space 767 } 768 char* s = NEW_RESOURCE_ARRAY(char, length); 769 strcpy(s, args[0]); 770 for (int j = 1; j < count; j++) { 771 strcat(s, " "); 772 strcat(s, args[j]); 773 } 774 return (const char*) s; 775 } 776 777 void Arguments::print_on(outputStream* st) { 778 st->print_cr("VM Arguments:"); 779 if (num_jvm_flags() > 0) { 780 st->print("jvm_flags: "); print_jvm_flags_on(st); 781 } 782 if (num_jvm_args() > 0) { 783 st->print("jvm_args: "); print_jvm_args_on(st); 784 } 785 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 786 if (_java_class_path != NULL) { 787 char* path = _java_class_path->value(); 788 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 789 } 790 st->print_cr("Launcher Type: %s", _sun_java_launcher); 791 } 792 793 void Arguments::print_jvm_flags_on(outputStream* st) { 794 if (_num_jvm_flags > 0) { 795 for (int i=0; i < _num_jvm_flags; i++) { 796 st->print("%s ", _jvm_flags_array[i]); 797 } 798 st->cr(); 799 } 800 } 801 802 void Arguments::print_jvm_args_on(outputStream* st) { 803 if (_num_jvm_args > 0) { 804 for (int i=0; i < _num_jvm_args; i++) { 805 st->print("%s ", _jvm_args_array[i]); 806 } 807 st->cr(); 808 } 809 } 810 811 bool Arguments::process_argument(const char* arg, 812 jboolean ignore_unrecognized, Flag::Flags origin) { 813 814 JDK_Version since = JDK_Version(); 815 816 if (parse_argument(arg, origin) || ignore_unrecognized) { 817 return true; 818 } 819 820 // Determine if the flag has '+', '-', or '=' characters. 821 bool has_plus_minus = (*arg == '+' || *arg == '-'); 822 const char* const argname = has_plus_minus ? arg + 1 : arg; 823 824 size_t arg_len; 825 const char* equal_sign = strchr(argname, '='); 826 if (equal_sign == NULL) { 827 arg_len = strlen(argname); 828 } else { 829 arg_len = equal_sign - argname; 830 } 831 832 // Construct a string which consists only of the argument name without '+', '-', or '='. 833 char stripped_argname[256]; 834 strncpy(stripped_argname, argname, arg_len); 835 stripped_argname[arg_len] = '\0'; //strncpy doesn't null terminate. 836 837 if (is_newly_obsolete(stripped_argname, &since)) { 838 char version[256]; 839 since.to_string(version, sizeof(version)); 840 warning("ignoring option %s; support was removed in %s", stripped_argname, version); 841 return true; 842 } 843 844 // For locked flags, report a custom error message if available. 845 // Otherwise, report the standard unrecognized VM option. 846 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 847 if (found_flag != NULL) { 848 char locked_message_buf[BUFLEN]; 849 found_flag->get_locked_message(locked_message_buf, BUFLEN); 850 if (strlen(locked_message_buf) == 0) { 851 if (found_flag->is_bool() && !has_plus_minus) { 852 jio_fprintf(defaultStream::error_stream(), 853 "Missing +/- setting for VM option '%s'\n", argname); 854 } else if (!found_flag->is_bool() && has_plus_minus) { 855 jio_fprintf(defaultStream::error_stream(), 856 "Unexpected +/- setting in VM option '%s'\n", argname); 857 } else { 858 jio_fprintf(defaultStream::error_stream(), 859 "Improperly specified VM option '%s'\n", argname); 860 } 861 } else { 862 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 863 } 864 } else { 865 jio_fprintf(defaultStream::error_stream(), 866 "Unrecognized VM option '%s'\n", argname); 867 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 868 if (fuzzy_matched != NULL) { 869 jio_fprintf(defaultStream::error_stream(), 870 "Did you mean '%s%s%s'? ", 871 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 872 fuzzy_matched->_name, 873 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 874 } 875 } 876 877 // allow for commandline "commenting out" options like -XX:#+Verbose 878 return arg[0] == '#'; 879 } 880 881 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 882 FILE* stream = fopen(file_name, "rb"); 883 if (stream == NULL) { 884 if (should_exist) { 885 jio_fprintf(defaultStream::error_stream(), 886 "Could not open settings file %s\n", file_name); 887 return false; 888 } else { 889 return true; 890 } 891 } 892 893 char token[1024]; 894 int pos = 0; 895 896 bool in_white_space = true; 897 bool in_comment = false; 898 bool in_quote = false; 899 char quote_c = 0; 900 bool result = true; 901 902 int c = getc(stream); 903 while(c != EOF && pos < (int)(sizeof(token)-1)) { 904 if (in_white_space) { 905 if (in_comment) { 906 if (c == '\n') in_comment = false; 907 } else { 908 if (c == '#') in_comment = true; 909 else if (!isspace(c)) { 910 in_white_space = false; 911 token[pos++] = c; 912 } 913 } 914 } else { 915 if (c == '\n' || (!in_quote && isspace(c))) { 916 // token ends at newline, or at unquoted whitespace 917 // this allows a way to include spaces in string-valued options 918 token[pos] = '\0'; 919 logOption(token); 920 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 921 build_jvm_flags(token); 922 pos = 0; 923 in_white_space = true; 924 in_quote = false; 925 } else if (!in_quote && (c == '\'' || c == '"')) { 926 in_quote = true; 927 quote_c = c; 928 } else if (in_quote && (c == quote_c)) { 929 in_quote = false; 930 } else { 931 token[pos++] = c; 932 } 933 } 934 c = getc(stream); 935 } 936 if (pos > 0) { 937 token[pos] = '\0'; 938 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 939 build_jvm_flags(token); 940 } 941 fclose(stream); 942 return result; 943 } 944 945 //============================================================================================================= 946 // Parsing of properties (-D) 947 948 const char* Arguments::get_property(const char* key) { 949 return PropertyList_get_value(system_properties(), key); 950 } 951 952 bool Arguments::add_property(const char* prop) { 953 const char* eq = strchr(prop, '='); 954 char* key; 955 // ns must be static--its address may be stored in a SystemProperty object. 956 const static char ns[1] = {0}; 957 char* value = (char *)ns; 958 959 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 960 key = AllocateHeap(key_len + 1, mtInternal); 961 strncpy(key, prop, key_len); 962 key[key_len] = '\0'; 963 964 if (eq != NULL) { 965 size_t value_len = strlen(prop) - key_len - 1; 966 value = AllocateHeap(value_len + 1, mtInternal); 967 strncpy(value, &prop[key_len + 1], value_len + 1); 968 } 969 970 if (strcmp(key, "java.compiler") == 0) { 971 process_java_compiler_argument(value); 972 FreeHeap(key); 973 if (eq != NULL) { 974 FreeHeap(value); 975 } 976 return true; 977 } else if (strcmp(key, "sun.java.command") == 0) { 978 _java_command = value; 979 980 // Record value in Arguments, but let it get passed to Java. 981 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 982 strcmp(key, "sun.java.launcher.pid") == 0) { 983 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 984 // private and are processed in process_sun_java_launcher_properties(); 985 // the sun.java.launcher property is passed on to the java application 986 FreeHeap(key); 987 if (eq != NULL) { 988 FreeHeap(value); 989 } 990 return true; 991 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 992 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 993 // its value without going through the property list or making a Java call. 994 _java_vendor_url_bug = value; 995 } else if (strcmp(key, "sun.boot.library.path") == 0) { 996 PropertyList_unique_add(&_system_properties, key, value, true); 997 return true; 998 } 999 // Create new property and add at the end of the list 1000 PropertyList_unique_add(&_system_properties, key, value); 1001 return true; 1002 } 1003 1004 //=========================================================================================================== 1005 // Setting int/mixed/comp mode flags 1006 1007 void Arguments::set_mode_flags(Mode mode) { 1008 // Set up default values for all flags. 1009 // If you add a flag to any of the branches below, 1010 // add a default value for it here. 1011 set_java_compiler(false); 1012 _mode = mode; 1013 1014 // Ensure Agent_OnLoad has the correct initial values. 1015 // This may not be the final mode; mode may change later in onload phase. 1016 PropertyList_unique_add(&_system_properties, "java.vm.info", 1017 (char*)VM_Version::vm_info_string(), false); 1018 1019 UseInterpreter = true; 1020 UseCompiler = true; 1021 UseLoopCounter = true; 1022 1023 // Default values may be platform/compiler dependent - 1024 // use the saved values 1025 ClipInlining = Arguments::_ClipInlining; 1026 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1027 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1028 BackgroundCompilation = Arguments::_BackgroundCompilation; 1029 if (TieredCompilation) { 1030 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1031 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1032 } 1033 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1034 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1035 } 1036 } 1037 1038 // Change from defaults based on mode 1039 switch (mode) { 1040 default: 1041 ShouldNotReachHere(); 1042 break; 1043 case _int: 1044 UseCompiler = false; 1045 UseLoopCounter = false; 1046 AlwaysCompileLoopMethods = false; 1047 UseOnStackReplacement = false; 1048 break; 1049 case _mixed: 1050 // same as default 1051 break; 1052 case _comp: 1053 UseInterpreter = false; 1054 BackgroundCompilation = false; 1055 ClipInlining = false; 1056 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1057 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1058 // compile a level 4 (C2) and then continue executing it. 1059 if (TieredCompilation) { 1060 Tier3InvokeNotifyFreqLog = 0; 1061 Tier4InvocationThreshold = 0; 1062 } 1063 break; 1064 } 1065 } 1066 1067 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1068 // Conflict: required to use shared spaces (-Xshare:on), but 1069 // incompatible command line options were chosen. 1070 1071 static void no_shared_spaces(const char* message) { 1072 if (RequireSharedSpaces) { 1073 jio_fprintf(defaultStream::error_stream(), 1074 "Class data sharing is inconsistent with other specified options.\n"); 1075 vm_exit_during_initialization("Unable to use shared archive.", message); 1076 } else { 1077 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1078 } 1079 } 1080 #endif 1081 1082 // Returns threshold scaled with the value of scale. 1083 // If scale < 0.0, threshold is returned without scaling. 1084 intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1085 if (scale == 1.0 || scale < 0.0) { 1086 return threshold; 1087 } else { 1088 return (intx)(threshold * scale); 1089 } 1090 } 1091 1092 // Returns freq_log scaled with the value of scale. 1093 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1094 // If scale < 0.0, freq_log is returned without scaling. 1095 intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1096 // Check if scaling is necessary or if negative value was specified. 1097 if (scale == 1.0 || scale < 0.0) { 1098 return freq_log; 1099 } 1100 // Check values to avoid calculating log2 of 0. 1101 if (scale == 0.0 || freq_log == 0) { 1102 return 0; 1103 } 1104 // Determine the maximum notification frequency value currently supported. 1105 // The largest mask value that the interpreter/C1 can handle is 1106 // of length InvocationCounter::number_of_count_bits. Mask values are always 1107 // one bit shorter then the value of the notification frequency. Set 1108 // max_freq_bits accordingly. 1109 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1110 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1111 if (scaled_freq == 0) { 1112 // Return 0 right away to avoid calculating log2 of 0. 1113 return 0; 1114 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1115 return max_freq_bits; 1116 } else { 1117 return log2_intptr(scaled_freq); 1118 } 1119 } 1120 1121 void Arguments::set_tiered_flags() { 1122 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1123 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1124 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1125 } 1126 if (CompilationPolicyChoice < 2) { 1127 vm_exit_during_initialization( 1128 "Incompatible compilation policy selected", NULL); 1129 } 1130 // Increase the code cache size - tiered compiles a lot more. 1131 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1132 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1133 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1134 } 1135 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1136 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1137 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1138 1139 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1140 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap) 1141 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) { 1142 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1143 } 1144 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) { 1145 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1146 } 1147 // Check consistency of code heap sizes 1148 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 1149 jio_fprintf(defaultStream::error_stream(), 1150 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 1151 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 1152 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 1153 vm_exit(1); 1154 } 1155 } 1156 } 1157 if (!UseInterpreter) { // -Xcomp 1158 Tier3InvokeNotifyFreqLog = 0; 1159 Tier4InvocationThreshold = 0; 1160 } 1161 1162 if (CompileThresholdScaling < 0) { 1163 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1164 } 1165 1166 // Scale tiered compilation thresholds. 1167 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1168 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1169 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1170 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1171 1172 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1173 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1174 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1175 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1176 1177 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1178 // once these thresholds become supported. 1179 1180 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1181 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1182 1183 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1184 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1185 1186 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1187 1188 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1189 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1190 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1191 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1192 } 1193 } 1194 1195 /** 1196 * Returns the minimum number of compiler threads needed to run the JVM. The following 1197 * configurations are possible. 1198 * 1199 * 1) The JVM is build using an interpreter only. As a result, the minimum number of 1200 * compiler threads is 0. 1201 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As 1202 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1. 1203 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However, 1204 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only 1205 * C1 can be used, so the minimum number of compiler threads is 1. 1206 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option 1207 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result, 1208 * the minimum number of compiler threads is 2. 1209 */ 1210 int Arguments::get_min_number_of_compiler_threads() { 1211 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 1212 return 0; // case 1 1213 #else 1214 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) { 1215 return 1; // case 2 or case 3 1216 } 1217 return 2; // case 4 (tiered) 1218 #endif 1219 } 1220 1221 #if INCLUDE_ALL_GCS 1222 static void disable_adaptive_size_policy(const char* collector_name) { 1223 if (UseAdaptiveSizePolicy) { 1224 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1225 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1226 collector_name); 1227 } 1228 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1229 } 1230 } 1231 1232 void Arguments::set_parnew_gc_flags() { 1233 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1234 "control point invariant"); 1235 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1236 assert(UseParNewGC, "ParNew should always be used with CMS"); 1237 1238 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1239 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1240 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1241 } else if (ParallelGCThreads == 0) { 1242 jio_fprintf(defaultStream::error_stream(), 1243 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1244 vm_exit(1); 1245 } 1246 1247 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1248 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1249 // we set them to 1024 and 1024. 1250 // See CR 6362902. 1251 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1252 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1253 } 1254 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1255 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1256 } 1257 1258 // When using compressed oops, we use local overflow stacks, 1259 // rather than using a global overflow list chained through 1260 // the klass word of the object's pre-image. 1261 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1262 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1263 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1264 } 1265 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1266 } 1267 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1268 } 1269 1270 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1271 // sparc/solaris for certain applications, but would gain from 1272 // further optimization and tuning efforts, and would almost 1273 // certainly gain from analysis of platform and environment. 1274 void Arguments::set_cms_and_parnew_gc_flags() { 1275 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1276 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1277 assert(UseParNewGC, "ParNew should always be used with CMS"); 1278 1279 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1280 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1281 1282 set_parnew_gc_flags(); 1283 1284 size_t max_heap = align_size_down(MaxHeapSize, 1285 CardTableRS::ct_max_alignment_constraint()); 1286 1287 // Now make adjustments for CMS 1288 intx tenuring_default = (intx)6; 1289 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1290 1291 // Preferred young gen size for "short" pauses: 1292 // upper bound depends on # of threads and NewRatio. 1293 const size_t preferred_max_new_size_unaligned = 1294 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads)); 1295 size_t preferred_max_new_size = 1296 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1297 1298 // Unless explicitly requested otherwise, size young gen 1299 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1300 1301 // If either MaxNewSize or NewRatio is set on the command line, 1302 // assume the user is trying to set the size of the young gen. 1303 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1304 1305 // Set MaxNewSize to our calculated preferred_max_new_size unless 1306 // NewSize was set on the command line and it is larger than 1307 // preferred_max_new_size. 1308 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1309 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1310 } else { 1311 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size); 1312 } 1313 if (PrintGCDetails && Verbose) { 1314 // Too early to use gclog_or_tty 1315 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1316 } 1317 1318 // Code along this path potentially sets NewSize and OldSize 1319 if (PrintGCDetails && Verbose) { 1320 // Too early to use gclog_or_tty 1321 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1322 " initial_heap_size: " SIZE_FORMAT 1323 " max_heap: " SIZE_FORMAT, 1324 min_heap_size(), InitialHeapSize, max_heap); 1325 } 1326 size_t min_new = preferred_max_new_size; 1327 if (FLAG_IS_CMDLINE(NewSize)) { 1328 min_new = NewSize; 1329 } 1330 if (max_heap > min_new && min_heap_size() > min_new) { 1331 // Unless explicitly requested otherwise, make young gen 1332 // at least min_new, and at most preferred_max_new_size. 1333 if (FLAG_IS_DEFAULT(NewSize)) { 1334 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new)); 1335 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize)); 1336 if (PrintGCDetails && Verbose) { 1337 // Too early to use gclog_or_tty 1338 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1339 } 1340 } 1341 // Unless explicitly requested otherwise, size old gen 1342 // so it's NewRatio x of NewSize. 1343 if (FLAG_IS_DEFAULT(OldSize)) { 1344 if (max_heap > NewSize) { 1345 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1346 if (PrintGCDetails && Verbose) { 1347 // Too early to use gclog_or_tty 1348 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1349 } 1350 } 1351 } 1352 } 1353 } 1354 // Unless explicitly requested otherwise, definitely 1355 // promote all objects surviving "tenuring_default" scavenges. 1356 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1357 FLAG_IS_DEFAULT(SurvivorRatio)) { 1358 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1359 } 1360 // If we decided above (or user explicitly requested) 1361 // `promote all' (via MaxTenuringThreshold := 0), 1362 // prefer minuscule survivor spaces so as not to waste 1363 // space for (non-existent) survivors 1364 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1365 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1366 } 1367 1368 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1369 // but rather the number of free blocks of a given size that are used when 1370 // replenishing the local per-worker free list caches. 1371 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1372 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1373 // OldPLAB sizing manually turned off: Use a larger default setting, 1374 // unless it was manually specified. This is because a too-low value 1375 // will slow down scavenges. 1376 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166 1377 } else { 1378 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1379 } 1380 } 1381 1382 // If either of the static initialization defaults have changed, note this 1383 // modification. 1384 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1385 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1386 } 1387 if (PrintGCDetails && Verbose) { 1388 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1389 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1390 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1391 } 1392 } 1393 #endif // INCLUDE_ALL_GCS 1394 1395 void set_object_alignment() { 1396 // Object alignment. 1397 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1398 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1399 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1400 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1401 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1402 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1403 1404 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1405 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1406 1407 // Oop encoding heap max 1408 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1409 1410 #if INCLUDE_ALL_GCS 1411 // Set CMS global values 1412 CompactibleFreeListSpace::set_cms_values(); 1413 #endif // INCLUDE_ALL_GCS 1414 } 1415 1416 bool verify_object_alignment() { 1417 // Object alignment. 1418 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1419 jio_fprintf(defaultStream::error_stream(), 1420 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1421 (int)ObjectAlignmentInBytes); 1422 return false; 1423 } 1424 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1425 jio_fprintf(defaultStream::error_stream(), 1426 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1427 (int)ObjectAlignmentInBytes, BytesPerLong); 1428 return false; 1429 } 1430 // It does not make sense to have big object alignment 1431 // since a space lost due to alignment will be greater 1432 // then a saved space from compressed oops. 1433 if ((int)ObjectAlignmentInBytes > 256) { 1434 jio_fprintf(defaultStream::error_stream(), 1435 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1436 (int)ObjectAlignmentInBytes); 1437 return false; 1438 } 1439 // In case page size is very small. 1440 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1441 jio_fprintf(defaultStream::error_stream(), 1442 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1443 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1444 return false; 1445 } 1446 if(SurvivorAlignmentInBytes == 0) { 1447 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1448 } else { 1449 if (!is_power_of_2(SurvivorAlignmentInBytes)) { 1450 jio_fprintf(defaultStream::error_stream(), 1451 "error: SurvivorAlignmentInBytes=%d must be power of 2\n", 1452 (int)SurvivorAlignmentInBytes); 1453 return false; 1454 } 1455 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) { 1456 jio_fprintf(defaultStream::error_stream(), 1457 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n", 1458 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes); 1459 return false; 1460 } 1461 } 1462 return true; 1463 } 1464 1465 size_t Arguments::max_heap_for_compressed_oops() { 1466 // Avoid sign flip. 1467 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1468 // We need to fit both the NULL page and the heap into the memory budget, while 1469 // keeping alignment constraints of the heap. To guarantee the latter, as the 1470 // NULL page is located before the heap, we pad the NULL page to the conservative 1471 // maximum alignment that the GC may ever impose upon the heap. 1472 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1473 _conservative_max_heap_alignment); 1474 1475 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1476 NOT_LP64(ShouldNotReachHere(); return 0); 1477 } 1478 1479 bool Arguments::should_auto_select_low_pause_collector() { 1480 if (UseAutoGCSelectPolicy && 1481 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1482 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1483 if (PrintGCDetails) { 1484 // Cannot use gclog_or_tty yet. 1485 tty->print_cr("Automatic selection of the low pause collector" 1486 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1487 } 1488 return true; 1489 } 1490 return false; 1491 } 1492 1493 void Arguments::set_use_compressed_oops() { 1494 #ifndef ZERO 1495 #ifdef _LP64 1496 // MaxHeapSize is not set up properly at this point, but 1497 // the only value that can override MaxHeapSize if we are 1498 // to use UseCompressedOops is InitialHeapSize. 1499 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1500 1501 if (max_heap_size <= max_heap_for_compressed_oops()) { 1502 #if !defined(COMPILER1) || defined(TIERED) 1503 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1504 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1505 } 1506 #endif 1507 } else { 1508 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1509 warning("Max heap size too large for Compressed Oops"); 1510 FLAG_SET_DEFAULT(UseCompressedOops, false); 1511 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1512 } 1513 } 1514 #endif // _LP64 1515 #endif // ZERO 1516 } 1517 1518 1519 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1520 // set_use_compressed_oops(). 1521 void Arguments::set_use_compressed_klass_ptrs() { 1522 #ifndef ZERO 1523 #ifdef _LP64 1524 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1525 if (!UseCompressedOops) { 1526 if (UseCompressedClassPointers) { 1527 warning("UseCompressedClassPointers requires UseCompressedOops"); 1528 } 1529 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1530 } else { 1531 // Turn on UseCompressedClassPointers too 1532 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1533 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1534 } 1535 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1536 if (UseCompressedClassPointers) { 1537 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1538 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1539 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1540 } 1541 } 1542 } 1543 #endif // _LP64 1544 #endif // !ZERO 1545 } 1546 1547 void Arguments::set_conservative_max_heap_alignment() { 1548 // The conservative maximum required alignment for the heap is the maximum of 1549 // the alignments imposed by several sources: any requirements from the heap 1550 // itself, the collector policy and the maximum page size we may run the VM 1551 // with. 1552 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1553 #if INCLUDE_ALL_GCS 1554 if (UseParallelGC) { 1555 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1556 } else if (UseG1GC) { 1557 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1558 } 1559 #endif // INCLUDE_ALL_GCS 1560 _conservative_max_heap_alignment = MAX4(heap_alignment, 1561 (size_t)os::vm_allocation_granularity(), 1562 os::max_page_size(), 1563 CollectorPolicy::compute_heap_alignment()); 1564 } 1565 1566 void Arguments::select_gc_ergonomically() { 1567 if (os::is_server_class_machine()) { 1568 if (should_auto_select_low_pause_collector()) { 1569 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1570 } else { 1571 FLAG_SET_ERGO(bool, UseParallelGC, true); 1572 } 1573 } else { 1574 FLAG_SET_ERGO(bool, UseSerialGC, true); 1575 } 1576 } 1577 1578 void Arguments::select_gc() { 1579 if (!gc_selected()) { 1580 select_gc_ergonomically(); 1581 guarantee(gc_selected(), "No GC selected"); 1582 } 1583 } 1584 1585 void Arguments::set_ergonomics_flags() { 1586 select_gc(); 1587 1588 #ifdef COMPILER2 1589 // Shared spaces work fine with other GCs but causes bytecode rewriting 1590 // to be disabled, which hurts interpreter performance and decreases 1591 // server performance. When -server is specified, keep the default off 1592 // unless it is asked for. Future work: either add bytecode rewriting 1593 // at link time, or rewrite bytecodes in non-shared methods. 1594 if (!DumpSharedSpaces && !RequireSharedSpaces && 1595 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1596 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1597 } 1598 #endif 1599 1600 set_conservative_max_heap_alignment(); 1601 1602 #ifndef ZERO 1603 #ifdef _LP64 1604 set_use_compressed_oops(); 1605 1606 // set_use_compressed_klass_ptrs() must be called after calling 1607 // set_use_compressed_oops(). 1608 set_use_compressed_klass_ptrs(); 1609 1610 // Also checks that certain machines are slower with compressed oops 1611 // in vm_version initialization code. 1612 #endif // _LP64 1613 #endif // !ZERO 1614 } 1615 1616 void Arguments::set_parallel_gc_flags() { 1617 assert(UseParallelGC || UseParallelOldGC, "Error"); 1618 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1619 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1620 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1621 } 1622 FLAG_SET_DEFAULT(UseParallelGC, true); 1623 1624 // If no heap maximum was requested explicitly, use some reasonable fraction 1625 // of the physical memory, up to a maximum of 1GB. 1626 FLAG_SET_DEFAULT(ParallelGCThreads, 1627 Abstract_VM_Version::parallel_worker_threads()); 1628 if (ParallelGCThreads == 0) { 1629 jio_fprintf(defaultStream::error_stream(), 1630 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1631 vm_exit(1); 1632 } 1633 1634 if (UseAdaptiveSizePolicy) { 1635 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1636 // unless the user actually sets these flags. 1637 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1638 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1639 _min_heap_free_ratio = MinHeapFreeRatio; 1640 } 1641 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1642 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1643 _max_heap_free_ratio = MaxHeapFreeRatio; 1644 } 1645 } 1646 1647 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1648 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1649 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1650 // See CR 6362902 for details. 1651 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1652 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1653 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1654 } 1655 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1656 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1657 } 1658 } 1659 1660 if (UseParallelOldGC) { 1661 // Par compact uses lower default values since they are treated as 1662 // minimums. These are different defaults because of the different 1663 // interpretation and are not ergonomically set. 1664 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1665 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1666 } 1667 } 1668 } 1669 1670 void Arguments::set_g1_gc_flags() { 1671 assert(UseG1GC, "Error"); 1672 #ifdef COMPILER1 1673 FastTLABRefill = false; 1674 #endif 1675 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1676 if (ParallelGCThreads == 0) { 1677 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1678 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1679 } 1680 1681 #if INCLUDE_ALL_GCS 1682 if (G1ConcRefinementThreads == 0) { 1683 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads); 1684 } 1685 #endif 1686 1687 // MarkStackSize will be set (if it hasn't been set by the user) 1688 // when concurrent marking is initialized. 1689 // Its value will be based upon the number of parallel marking threads. 1690 // But we do set the maximum mark stack size here. 1691 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1692 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1693 } 1694 1695 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1696 // In G1, we want the default GC overhead goal to be higher than 1697 // say in PS. So we set it here to 10%. Otherwise the heap might 1698 // be expanded more aggressively than we would like it to. In 1699 // fact, even 10% seems to not be high enough in some cases 1700 // (especially small GC stress tests that the main thing they do 1701 // is allocation). We might consider increase it further. 1702 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1703 } 1704 1705 if (PrintGCDetails && Verbose) { 1706 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1707 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1708 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1709 } 1710 } 1711 1712 #if !INCLUDE_ALL_GCS 1713 #ifdef ASSERT 1714 static bool verify_serial_gc_flags() { 1715 return (UseSerialGC && 1716 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC || 1717 UseParallelGC || UseParallelOldGC)); 1718 } 1719 #endif // ASSERT 1720 #endif // INCLUDE_ALL_GCS 1721 1722 void Arguments::set_gc_specific_flags() { 1723 #if INCLUDE_ALL_GCS 1724 // Set per-collector flags 1725 if (UseParallelGC || UseParallelOldGC) { 1726 set_parallel_gc_flags(); 1727 } else if (UseConcMarkSweepGC) { 1728 set_cms_and_parnew_gc_flags(); 1729 } else if (UseG1GC) { 1730 set_g1_gc_flags(); 1731 } 1732 check_deprecated_gc_flags(); 1733 if (AssumeMP && !UseSerialGC) { 1734 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 1735 warning("If the number of processors is expected to increase from one, then" 1736 " you should configure the number of parallel GC threads appropriately" 1737 " using -XX:ParallelGCThreads=N"); 1738 } 1739 } 1740 if (MinHeapFreeRatio == 100) { 1741 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1742 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 1743 } 1744 #else // INCLUDE_ALL_GCS 1745 assert(verify_serial_gc_flags(), "SerialGC unset"); 1746 #endif // INCLUDE_ALL_GCS 1747 } 1748 1749 julong Arguments::limit_by_allocatable_memory(julong limit) { 1750 julong max_allocatable; 1751 julong result = limit; 1752 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1753 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1754 } 1755 return result; 1756 } 1757 1758 // Use static initialization to get the default before parsing 1759 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1760 1761 void Arguments::set_heap_size() { 1762 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1763 // Deprecated flag 1764 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1765 } 1766 1767 const julong phys_mem = 1768 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1769 : (julong)MaxRAM; 1770 1771 // If the maximum heap size has not been set with -Xmx, 1772 // then set it as fraction of the size of physical memory, 1773 // respecting the maximum and minimum sizes of the heap. 1774 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1775 julong reasonable_max = phys_mem / MaxRAMFraction; 1776 1777 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1778 // Small physical memory, so use a minimum fraction of it for the heap 1779 reasonable_max = phys_mem / MinRAMFraction; 1780 } else { 1781 // Not-small physical memory, so require a heap at least 1782 // as large as MaxHeapSize 1783 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1784 } 1785 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1786 // Limit the heap size to ErgoHeapSizeLimit 1787 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1788 } 1789 if (UseCompressedOops) { 1790 // Limit the heap size to the maximum possible when using compressed oops 1791 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1792 1793 // HeapBaseMinAddress can be greater than default but not less than. 1794 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1795 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1796 // matches compressed oops printing flags 1797 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 1798 jio_fprintf(defaultStream::error_stream(), 1799 "HeapBaseMinAddress must be at least " SIZE_FORMAT 1800 " (" SIZE_FORMAT "G) which is greater than value given " 1801 SIZE_FORMAT "\n", 1802 DefaultHeapBaseMinAddress, 1803 DefaultHeapBaseMinAddress/G, 1804 HeapBaseMinAddress); 1805 } 1806 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1807 } 1808 } 1809 1810 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1811 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1812 // but it should be not less than default MaxHeapSize. 1813 max_coop_heap -= HeapBaseMinAddress; 1814 } 1815 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1816 } 1817 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1818 1819 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1820 // An initial heap size was specified on the command line, 1821 // so be sure that the maximum size is consistent. Done 1822 // after call to limit_by_allocatable_memory because that 1823 // method might reduce the allocation size. 1824 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1825 } 1826 1827 if (PrintGCDetails && Verbose) { 1828 // Cannot use gclog_or_tty yet. 1829 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1830 } 1831 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 1832 } 1833 1834 // If the minimum or initial heap_size have not been set or requested to be set 1835 // ergonomically, set them accordingly. 1836 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1837 julong reasonable_minimum = (julong)(OldSize + NewSize); 1838 1839 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1840 1841 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1842 1843 if (InitialHeapSize == 0) { 1844 julong reasonable_initial = phys_mem / InitialRAMFraction; 1845 1846 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1847 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1848 1849 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1850 1851 if (PrintGCDetails && Verbose) { 1852 // Cannot use gclog_or_tty yet. 1853 tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 1854 } 1855 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 1856 } 1857 // If the minimum heap size has not been set (via -Xms), 1858 // synchronize with InitialHeapSize to avoid errors with the default value. 1859 if (min_heap_size() == 0) { 1860 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1861 if (PrintGCDetails && Verbose) { 1862 // Cannot use gclog_or_tty yet. 1863 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1864 } 1865 } 1866 } 1867 } 1868 1869 // This must be called after ergonomics. 1870 void Arguments::set_bytecode_flags() { 1871 if (!RewriteBytecodes) { 1872 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1873 } 1874 } 1875 1876 // Aggressive optimization flags -XX:+AggressiveOpts 1877 void Arguments::set_aggressive_opts_flags() { 1878 #ifdef COMPILER2 1879 if (AggressiveUnboxing) { 1880 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1881 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1882 } else if (!EliminateAutoBox) { 1883 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1884 AggressiveUnboxing = false; 1885 } 1886 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1887 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1888 } else if (!DoEscapeAnalysis) { 1889 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1890 AggressiveUnboxing = false; 1891 } 1892 } 1893 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1894 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1895 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1896 } 1897 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1898 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1899 } 1900 1901 // Feed the cache size setting into the JDK 1902 char buffer[1024]; 1903 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1904 add_property(buffer); 1905 } 1906 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1907 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1908 } 1909 #endif 1910 1911 if (AggressiveOpts) { 1912 // Sample flag setting code 1913 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1914 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1915 // } 1916 } 1917 } 1918 1919 //=========================================================================================================== 1920 // Parsing of java.compiler property 1921 1922 void Arguments::process_java_compiler_argument(char* arg) { 1923 // For backwards compatibility, Djava.compiler=NONE or "" 1924 // causes us to switch to -Xint mode UNLESS -Xdebug 1925 // is also specified. 1926 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1927 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1928 } 1929 } 1930 1931 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1932 _sun_java_launcher = os::strdup_check_oom(launcher); 1933 } 1934 1935 bool Arguments::created_by_java_launcher() { 1936 assert(_sun_java_launcher != NULL, "property must have value"); 1937 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1938 } 1939 1940 bool Arguments::sun_java_launcher_is_altjvm() { 1941 return _sun_java_launcher_is_altjvm; 1942 } 1943 1944 //=========================================================================================================== 1945 // Parsing of main arguments 1946 1947 bool Arguments::verify_interval(uintx val, uintx min, 1948 uintx max, const char* name) { 1949 // Returns true iff value is in the inclusive interval [min..max] 1950 // false, otherwise. 1951 if (val >= min && val <= max) { 1952 return true; 1953 } 1954 jio_fprintf(defaultStream::error_stream(), 1955 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1956 " and " UINTX_FORMAT "\n", 1957 name, val, min, max); 1958 return false; 1959 } 1960 1961 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1962 // Returns true if given value is at least specified min threshold 1963 // false, otherwise. 1964 if (val >= min ) { 1965 return true; 1966 } 1967 jio_fprintf(defaultStream::error_stream(), 1968 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1969 name, val, min); 1970 return false; 1971 } 1972 1973 bool Arguments::verify_percentage(uintx value, const char* name) { 1974 if (is_percentage(value)) { 1975 return true; 1976 } 1977 jio_fprintf(defaultStream::error_stream(), 1978 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1979 name, value); 1980 return false; 1981 } 1982 1983 // check if do gclog rotation 1984 // +UseGCLogFileRotation is a must, 1985 // no gc log rotation when log file not supplied or 1986 // NumberOfGCLogFiles is 0 1987 void check_gclog_consistency() { 1988 if (UseGCLogFileRotation) { 1989 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { 1990 jio_fprintf(defaultStream::output_stream(), 1991 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" 1992 "where num_of_file > 0\n" 1993 "GC log rotation is turned off\n"); 1994 UseGCLogFileRotation = false; 1995 } 1996 } 1997 1998 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { 1999 FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K); 2000 jio_fprintf(defaultStream::output_stream(), 2001 "GCLogFileSize changed to minimum 8K\n"); 2002 } 2003 } 2004 2005 // This function is called for -Xloggc:<filename>, it can be used 2006 // to check if a given file name(or string) conforms to the following 2007 // specification: 2008 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 2009 // %p and %t only allowed once. We only limit usage of filename not path 2010 bool is_filename_valid(const char *file_name) { 2011 const char* p = file_name; 2012 char file_sep = os::file_separator()[0]; 2013 const char* cp; 2014 // skip prefix path 2015 for (cp = file_name; *cp != '\0'; cp++) { 2016 if (*cp == '/' || *cp == file_sep) { 2017 p = cp + 1; 2018 } 2019 } 2020 2021 int count_p = 0; 2022 int count_t = 0; 2023 while (*p != '\0') { 2024 if ((*p >= '0' && *p <= '9') || 2025 (*p >= 'A' && *p <= 'Z') || 2026 (*p >= 'a' && *p <= 'z') || 2027 *p == '-' || 2028 *p == '_' || 2029 *p == '.') { 2030 p++; 2031 continue; 2032 } 2033 if (*p == '%') { 2034 if(*(p + 1) == 'p') { 2035 p += 2; 2036 count_p ++; 2037 continue; 2038 } 2039 if (*(p + 1) == 't') { 2040 p += 2; 2041 count_t ++; 2042 continue; 2043 } 2044 } 2045 return false; 2046 } 2047 return count_p < 2 && count_t < 2; 2048 } 2049 2050 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) { 2051 if (!is_percentage(min_heap_free_ratio)) { 2052 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100"); 2053 return false; 2054 } 2055 if (min_heap_free_ratio > MaxHeapFreeRatio) { 2056 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 2057 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio, 2058 MaxHeapFreeRatio); 2059 return false; 2060 } 2061 // This does not set the flag itself, but stores the value in a safe place for later usage. 2062 _min_heap_free_ratio = min_heap_free_ratio; 2063 return true; 2064 } 2065 2066 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) { 2067 if (!is_percentage(max_heap_free_ratio)) { 2068 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100"); 2069 return false; 2070 } 2071 if (max_heap_free_ratio < MinHeapFreeRatio) { 2072 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or " 2073 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio, 2074 MinHeapFreeRatio); 2075 return false; 2076 } 2077 // This does not set the flag itself, but stores the value in a safe place for later usage. 2078 _max_heap_free_ratio = max_heap_free_ratio; 2079 return true; 2080 } 2081 2082 // Check consistency of GC selection 2083 bool Arguments::check_gc_consistency() { 2084 check_gclog_consistency(); 2085 // Ensure that the user has not selected conflicting sets 2086 // of collectors. 2087 uint i = 0; 2088 if (UseSerialGC) i++; 2089 if (UseConcMarkSweepGC) i++; 2090 if (UseParallelGC || UseParallelOldGC) i++; 2091 if (UseG1GC) i++; 2092 if (i > 1) { 2093 jio_fprintf(defaultStream::error_stream(), 2094 "Conflicting collector combinations in option list; " 2095 "please refer to the release notes for the combinations " 2096 "allowed\n"); 2097 return false; 2098 } 2099 2100 if (UseConcMarkSweepGC && !UseParNewGC) { 2101 jio_fprintf(defaultStream::error_stream(), 2102 "It is not possible to combine the DefNew young collector with the CMS collector.\n"); 2103 return false; 2104 } 2105 2106 if (UseParNewGC && !UseConcMarkSweepGC) { 2107 jio_fprintf(defaultStream::error_stream(), 2108 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n"); 2109 return false; 2110 } 2111 2112 return true; 2113 } 2114 2115 void Arguments::check_deprecated_gc_flags() { 2116 if (FLAG_IS_CMDLINE(UseParNewGC)) { 2117 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release"); 2118 } 2119 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 2120 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 2121 "and will likely be removed in future release"); 2122 } 2123 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 2124 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 2125 "Use MaxRAMFraction instead."); 2126 } 2127 } 2128 2129 // Check stack pages settings 2130 bool Arguments::check_stack_pages() 2131 { 2132 bool status = true; 2133 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 2134 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 2135 // greater stack shadow pages can't generate instruction to bang stack 2136 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 2137 return status; 2138 } 2139 2140 // Check the consistency of vm_init_args 2141 bool Arguments::check_vm_args_consistency() { 2142 // Method for adding checks for flag consistency. 2143 // The intent is to warn the user of all possible conflicts, 2144 // before returning an error. 2145 // Note: Needs platform-dependent factoring. 2146 bool status = true; 2147 2148 if (TLABRefillWasteFraction == 0) { 2149 jio_fprintf(defaultStream::error_stream(), 2150 "TLABRefillWasteFraction should be a denominator, " 2151 "not " SIZE_FORMAT "\n", 2152 TLABRefillWasteFraction); 2153 status = false; 2154 } 2155 2156 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 2157 "AdaptiveSizePolicyWeight"); 2158 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 2159 2160 // Divide by bucket size to prevent a large size from causing rollover when 2161 // calculating amount of memory needed to be allocated for the String table. 2162 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2163 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2164 2165 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize, 2166 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size"); 2167 2168 { 2169 // Using "else if" below to avoid printing two error messages if min > max. 2170 // This will also prevent us from reporting both min>100 and max>100 at the 2171 // same time, but that is less annoying than printing two identical errors IMHO. 2172 FormatBuffer<80> err_msg("%s",""); 2173 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) { 2174 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2175 status = false; 2176 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) { 2177 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2178 status = false; 2179 } 2180 } 2181 2182 // Min/MaxMetaspaceFreeRatio 2183 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2184 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2185 2186 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2187 jio_fprintf(defaultStream::error_stream(), 2188 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2189 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2190 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2191 MinMetaspaceFreeRatio, 2192 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2193 MaxMetaspaceFreeRatio); 2194 status = false; 2195 } 2196 2197 // Trying to keep 100% free is not practical 2198 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2199 2200 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2201 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2202 } 2203 2204 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2205 // Settings to encourage splitting. 2206 if (!FLAG_IS_CMDLINE(NewRatio)) { 2207 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2208 } 2209 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2210 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2211 } 2212 } 2213 2214 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2215 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2216 } 2217 2218 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2219 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2220 if (GCTimeLimit == 100) { 2221 // Turn off gc-overhead-limit-exceeded checks 2222 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2223 } 2224 2225 status = status && check_gc_consistency(); 2226 status = status && check_stack_pages(); 2227 2228 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2229 "CMSIncrementalSafetyFactor"); 2230 2231 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2232 // insists that we hold the requisite locks so that the iteration is 2233 // MT-safe. For the verification at start-up and shut-down, we don't 2234 // yet have a good way of acquiring and releasing these locks, 2235 // which are not visible at the CollectedHeap level. We want to 2236 // be able to acquire these locks and then do the iteration rather 2237 // than just disable the lock verification. This will be fixed under 2238 // bug 4788986. 2239 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2240 if (VerifyDuringStartup) { 2241 warning("Heap verification at start-up disabled " 2242 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2243 VerifyDuringStartup = false; // Disable verification at start-up 2244 } 2245 2246 if (VerifyBeforeExit) { 2247 warning("Heap verification at shutdown disabled " 2248 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2249 VerifyBeforeExit = false; // Disable verification at shutdown 2250 } 2251 } 2252 2253 // Note: only executed in non-PRODUCT mode 2254 if (!UseAsyncConcMarkSweepGC && 2255 (ExplicitGCInvokesConcurrent || 2256 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2257 jio_fprintf(defaultStream::error_stream(), 2258 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2259 " with -UseAsyncConcMarkSweepGC"); 2260 status = false; 2261 } 2262 2263 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2264 2265 #if INCLUDE_ALL_GCS 2266 if (UseG1GC) { 2267 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent"); 2268 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent"); 2269 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent"); 2270 2271 status = status && verify_percentage(G1ConfidencePercent, "G1ConfidencePercent"); 2272 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2273 "InitiatingHeapOccupancyPercent"); 2274 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2275 "G1RefProcDrainInterval"); 2276 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2277 "G1ConcMarkStepDurationMillis"); 2278 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2279 "G1ConcRSHotCardLimit"); 2280 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 27, 2281 "G1ConcRSLogCacheSize"); 2282 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age, 2283 "StringDeduplicationAgeThreshold"); 2284 } 2285 if (UseConcMarkSweepGC) { 2286 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2287 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2288 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2289 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2290 2291 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2292 2293 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2294 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2295 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2296 2297 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2298 2299 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2300 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2301 2302 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2303 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2304 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2305 2306 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2307 2308 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2309 2310 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2311 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2312 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2313 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2314 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2315 } 2316 2317 if (UseParallelGC || UseParallelOldGC) { 2318 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2319 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2320 2321 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2322 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2323 2324 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2325 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2326 2327 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2328 2329 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2330 } 2331 #endif // INCLUDE_ALL_GCS 2332 2333 status = status && verify_interval(RefDiscoveryPolicy, 2334 ReferenceProcessor::DiscoveryPolicyMin, 2335 ReferenceProcessor::DiscoveryPolicyMax, 2336 "RefDiscoveryPolicy"); 2337 2338 // Limit the lower bound of this flag to 1 as it is used in a division 2339 // expression. 2340 status = status && verify_interval(TLABWasteTargetPercent, 2341 1, 100, "TLABWasteTargetPercent"); 2342 2343 status = status && verify_object_alignment(); 2344 2345 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2346 "CompressedClassSpaceSize"); 2347 2348 status = status && verify_interval(MarkStackSizeMax, 2349 1, (max_jint - 1), "MarkStackSizeMax"); 2350 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2351 2352 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2353 2354 status = status && verify_min_value(HeapSizePerGCThread, (size_t) os::vm_page_size(), "HeapSizePerGCThread"); 2355 2356 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2357 2358 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2359 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2360 2361 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2362 2363 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2364 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2365 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2366 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2367 2368 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2369 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2370 2371 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2372 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2373 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2374 2375 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2376 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2377 2378 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold"); 2379 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold"); 2380 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2381 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2382 2383 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2384 #ifdef COMPILER1 2385 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize"); 2386 #endif 2387 status = status && verify_min_value(HeapSearchSteps, 1, "HeapSearchSteps"); 2388 2389 if (PrintNMTStatistics) { 2390 #if INCLUDE_NMT 2391 if (MemTracker::tracking_level() == NMT_off) { 2392 #endif // INCLUDE_NMT 2393 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2394 PrintNMTStatistics = false; 2395 #if INCLUDE_NMT 2396 } 2397 #endif 2398 } 2399 2400 // Need to limit the extent of the padding to reasonable size. 2401 // 8K is well beyond the reasonable HW cache line size, even with the 2402 // aggressive prefetching, while still leaving the room for segregating 2403 // among the distinct pages. 2404 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2405 jio_fprintf(defaultStream::error_stream(), 2406 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2407 ContendedPaddingWidth, 0, 8192); 2408 status = false; 2409 } 2410 2411 // Need to enforce the padding not to break the existing field alignments. 2412 // It is sufficient to check against the largest type size. 2413 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2414 jio_fprintf(defaultStream::error_stream(), 2415 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2416 ContendedPaddingWidth, BytesPerLong); 2417 status = false; 2418 } 2419 2420 // Check lower bounds of the code cache 2421 // Template Interpreter code is approximately 3X larger in debug builds. 2422 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2423 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2424 jio_fprintf(defaultStream::error_stream(), 2425 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2426 os::vm_page_size()/K); 2427 status = false; 2428 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2429 jio_fprintf(defaultStream::error_stream(), 2430 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2431 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2432 status = false; 2433 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2434 jio_fprintf(defaultStream::error_stream(), 2435 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2436 min_code_cache_size/K); 2437 status = false; 2438 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2439 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2440 jio_fprintf(defaultStream::error_stream(), 2441 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2442 CODE_CACHE_SIZE_LIMIT/M); 2443 status = false; 2444 } else if (NonNMethodCodeHeapSize < min_code_cache_size){ 2445 jio_fprintf(defaultStream::error_stream(), 2446 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2447 min_code_cache_size/K); 2448 status = false; 2449 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) 2450 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 2451 jio_fprintf(defaultStream::error_stream(), 2452 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 2453 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 2454 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 2455 status = false; 2456 } 2457 2458 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); 2459 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength"); 2460 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize"); 2461 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt"); 2462 2463 2464 int min_number_of_compiler_threads = get_min_number_of_compiler_threads(); 2465 // The default CICompilerCount's value is CI_COMPILER_COUNT. 2466 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number"); 2467 // Check the minimum number of compiler threads 2468 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount"); 2469 2470 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2471 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2472 } 2473 2474 return status; 2475 } 2476 2477 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2478 const char* option_type) { 2479 if (ignore) return false; 2480 2481 const char* spacer = " "; 2482 if (option_type == NULL) { 2483 option_type = ++spacer; // Set both to the empty string. 2484 } 2485 2486 if (os::obsolete_option(option)) { 2487 jio_fprintf(defaultStream::error_stream(), 2488 "Obsolete %s%soption: %s\n", option_type, spacer, 2489 option->optionString); 2490 return false; 2491 } else { 2492 jio_fprintf(defaultStream::error_stream(), 2493 "Unrecognized %s%soption: %s\n", option_type, spacer, 2494 option->optionString); 2495 return true; 2496 } 2497 } 2498 2499 static const char* user_assertion_options[] = { 2500 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2501 }; 2502 2503 static const char* system_assertion_options[] = { 2504 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2505 }; 2506 2507 bool Arguments::parse_uintx(const char* value, 2508 uintx* uintx_arg, 2509 uintx min_size) { 2510 2511 // Check the sign first since atomull() parses only unsigned values. 2512 bool value_is_positive = !(*value == '-'); 2513 2514 if (value_is_positive) { 2515 julong n; 2516 bool good_return = atomull(value, &n); 2517 if (good_return) { 2518 bool above_minimum = n >= min_size; 2519 bool value_is_too_large = n > max_uintx; 2520 2521 if (above_minimum && !value_is_too_large) { 2522 *uintx_arg = n; 2523 return true; 2524 } 2525 } 2526 } 2527 return false; 2528 } 2529 2530 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2531 julong* long_arg, 2532 julong min_size) { 2533 if (!atomull(s, long_arg)) return arg_unreadable; 2534 return check_memory_size(*long_arg, min_size); 2535 } 2536 2537 // Parse JavaVMInitArgs structure 2538 2539 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2540 // For components of the system classpath. 2541 SysClassPath scp(Arguments::get_sysclasspath()); 2542 bool scp_assembly_required = false; 2543 2544 // Save default settings for some mode flags 2545 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2546 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2547 Arguments::_ClipInlining = ClipInlining; 2548 Arguments::_BackgroundCompilation = BackgroundCompilation; 2549 if (TieredCompilation) { 2550 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2551 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2552 } 2553 2554 // Setup flags for mixed which is the default 2555 set_mode_flags(_mixed); 2556 2557 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2558 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2559 if (result != JNI_OK) { 2560 return result; 2561 } 2562 2563 // Parse JavaVMInitArgs structure passed in 2564 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE); 2565 if (result != JNI_OK) { 2566 return result; 2567 } 2568 2569 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2570 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2571 if (result != JNI_OK) { 2572 return result; 2573 } 2574 2575 // Do final processing now that all arguments have been parsed 2576 result = finalize_vm_init_args(&scp, scp_assembly_required); 2577 if (result != JNI_OK) { 2578 return result; 2579 } 2580 2581 return JNI_OK; 2582 } 2583 2584 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2585 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2586 // are dealing with -agentpath (case where name is a path), otherwise with 2587 // -agentlib 2588 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2589 char *_name; 2590 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2591 size_t _len_hprof, _len_jdwp, _len_prefix; 2592 2593 if (is_path) { 2594 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2595 return false; 2596 } 2597 2598 _name++; // skip past last path separator 2599 _len_prefix = strlen(JNI_LIB_PREFIX); 2600 2601 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2602 return false; 2603 } 2604 2605 _name += _len_prefix; 2606 _len_hprof = strlen(_hprof); 2607 _len_jdwp = strlen(_jdwp); 2608 2609 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2610 _name += _len_hprof; 2611 } 2612 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2613 _name += _len_jdwp; 2614 } 2615 else { 2616 return false; 2617 } 2618 2619 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2620 return false; 2621 } 2622 2623 return true; 2624 } 2625 2626 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2627 return true; 2628 } 2629 2630 return false; 2631 } 2632 2633 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2634 SysClassPath* scp_p, 2635 bool* scp_assembly_required_p, 2636 Flag::Flags origin) { 2637 // Remaining part of option string 2638 const char* tail; 2639 2640 // iterate over arguments 2641 for (int index = 0; index < args->nOptions; index++) { 2642 bool is_absolute_path = false; // for -agentpath vs -agentlib 2643 2644 const JavaVMOption* option = args->options + index; 2645 2646 if (!match_option(option, "-Djava.class.path", &tail) && 2647 !match_option(option, "-Dsun.java.command", &tail) && 2648 !match_option(option, "-Dsun.java.launcher", &tail)) { 2649 2650 // add all jvm options to the jvm_args string. This string 2651 // is used later to set the java.vm.args PerfData string constant. 2652 // the -Djava.class.path and the -Dsun.java.command options are 2653 // omitted from jvm_args string as each have their own PerfData 2654 // string constant object. 2655 build_jvm_args(option->optionString); 2656 } 2657 2658 // -verbose:[class/gc/jni] 2659 if (match_option(option, "-verbose", &tail)) { 2660 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2661 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2662 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2663 } else if (!strcmp(tail, ":gc")) { 2664 FLAG_SET_CMDLINE(bool, PrintGC, true); 2665 } else if (!strcmp(tail, ":jni")) { 2666 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2667 } 2668 // -da / -ea / -disableassertions / -enableassertions 2669 // These accept an optional class/package name separated by a colon, e.g., 2670 // -da:java.lang.Thread. 2671 } else if (match_option(option, user_assertion_options, &tail, true)) { 2672 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2673 if (*tail == '\0') { 2674 JavaAssertions::setUserClassDefault(enable); 2675 } else { 2676 assert(*tail == ':', "bogus match by match_option()"); 2677 JavaAssertions::addOption(tail + 1, enable); 2678 } 2679 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2680 } else if (match_option(option, system_assertion_options, &tail, false)) { 2681 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2682 JavaAssertions::setSystemClassDefault(enable); 2683 // -bootclasspath: 2684 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2685 scp_p->reset_path(tail); 2686 *scp_assembly_required_p = true; 2687 // -bootclasspath/a: 2688 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2689 scp_p->add_suffix(tail); 2690 *scp_assembly_required_p = true; 2691 // -bootclasspath/p: 2692 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2693 scp_p->add_prefix(tail); 2694 *scp_assembly_required_p = true; 2695 // -Xrun 2696 } else if (match_option(option, "-Xrun", &tail)) { 2697 if (tail != NULL) { 2698 const char* pos = strchr(tail, ':'); 2699 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2700 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2701 name[len] = '\0'; 2702 2703 char *options = NULL; 2704 if(pos != NULL) { 2705 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2706 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2707 } 2708 #if !INCLUDE_JVMTI 2709 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2710 jio_fprintf(defaultStream::error_stream(), 2711 "Profiling and debugging agents are not supported in this VM\n"); 2712 return JNI_ERR; 2713 } 2714 #endif // !INCLUDE_JVMTI 2715 add_init_library(name, options); 2716 } 2717 // -agentlib and -agentpath 2718 } else if (match_option(option, "-agentlib:", &tail) || 2719 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2720 if(tail != NULL) { 2721 const char* pos = strchr(tail, '='); 2722 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2723 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2724 name[len] = '\0'; 2725 2726 char *options = NULL; 2727 if(pos != NULL) { 2728 options = os::strdup_check_oom(pos + 1, mtInternal); 2729 } 2730 #if !INCLUDE_JVMTI 2731 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2732 jio_fprintf(defaultStream::error_stream(), 2733 "Profiling and debugging agents are not supported in this VM\n"); 2734 return JNI_ERR; 2735 } 2736 #endif // !INCLUDE_JVMTI 2737 add_init_agent(name, options, is_absolute_path); 2738 } 2739 // -javaagent 2740 } else if (match_option(option, "-javaagent:", &tail)) { 2741 #if !INCLUDE_JVMTI 2742 jio_fprintf(defaultStream::error_stream(), 2743 "Instrumentation agents are not supported in this VM\n"); 2744 return JNI_ERR; 2745 #else 2746 if(tail != NULL) { 2747 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2748 add_init_agent("instrument", options, false); 2749 } 2750 #endif // !INCLUDE_JVMTI 2751 // -Xnoclassgc 2752 } else if (match_option(option, "-Xnoclassgc")) { 2753 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2754 // -Xconcgc 2755 } else if (match_option(option, "-Xconcgc")) { 2756 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2757 // -Xnoconcgc 2758 } else if (match_option(option, "-Xnoconcgc")) { 2759 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2760 // -Xbatch 2761 } else if (match_option(option, "-Xbatch")) { 2762 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2763 // -Xmn for compatibility with other JVM vendors 2764 } else if (match_option(option, "-Xmn", &tail)) { 2765 julong long_initial_young_size = 0; 2766 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2767 if (errcode != arg_in_range) { 2768 jio_fprintf(defaultStream::error_stream(), 2769 "Invalid initial young generation size: %s\n", option->optionString); 2770 describe_range_error(errcode); 2771 return JNI_EINVAL; 2772 } 2773 FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size); 2774 FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size); 2775 // -Xms 2776 } else if (match_option(option, "-Xms", &tail)) { 2777 julong long_initial_heap_size = 0; 2778 // an initial heap size of 0 means automatically determine 2779 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2780 if (errcode != arg_in_range) { 2781 jio_fprintf(defaultStream::error_stream(), 2782 "Invalid initial heap size: %s\n", option->optionString); 2783 describe_range_error(errcode); 2784 return JNI_EINVAL; 2785 } 2786 set_min_heap_size((size_t)long_initial_heap_size); 2787 // Currently the minimum size and the initial heap sizes are the same. 2788 // Can be overridden with -XX:InitialHeapSize. 2789 FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size); 2790 // -Xmx 2791 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2792 julong long_max_heap_size = 0; 2793 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2794 if (errcode != arg_in_range) { 2795 jio_fprintf(defaultStream::error_stream(), 2796 "Invalid maximum heap size: %s\n", option->optionString); 2797 describe_range_error(errcode); 2798 return JNI_EINVAL; 2799 } 2800 FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size); 2801 // Xmaxf 2802 } else if (match_option(option, "-Xmaxf", &tail)) { 2803 char* err; 2804 int maxf = (int)(strtod(tail, &err) * 100); 2805 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) { 2806 jio_fprintf(defaultStream::error_stream(), 2807 "Bad max heap free percentage size: %s\n", 2808 option->optionString); 2809 return JNI_EINVAL; 2810 } else { 2811 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2812 } 2813 // Xminf 2814 } else if (match_option(option, "-Xminf", &tail)) { 2815 char* err; 2816 int minf = (int)(strtod(tail, &err) * 100); 2817 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) { 2818 jio_fprintf(defaultStream::error_stream(), 2819 "Bad min heap free percentage size: %s\n", 2820 option->optionString); 2821 return JNI_EINVAL; 2822 } else { 2823 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2824 } 2825 // -Xss 2826 } else if (match_option(option, "-Xss", &tail)) { 2827 julong long_ThreadStackSize = 0; 2828 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2829 if (errcode != arg_in_range) { 2830 jio_fprintf(defaultStream::error_stream(), 2831 "Invalid thread stack size: %s\n", option->optionString); 2832 describe_range_error(errcode); 2833 return JNI_EINVAL; 2834 } 2835 // Internally track ThreadStackSize in units of 1024 bytes. 2836 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2837 round_to((int)long_ThreadStackSize, K) / K); 2838 // -Xoss 2839 } else if (match_option(option, "-Xoss", &tail)) { 2840 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2841 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2842 julong long_CodeCacheExpansionSize = 0; 2843 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2844 if (errcode != arg_in_range) { 2845 jio_fprintf(defaultStream::error_stream(), 2846 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2847 os::vm_page_size()/K); 2848 return JNI_EINVAL; 2849 } 2850 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2851 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2852 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2853 julong long_ReservedCodeCacheSize = 0; 2854 2855 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2856 if (errcode != arg_in_range) { 2857 jio_fprintf(defaultStream::error_stream(), 2858 "Invalid maximum code cache size: %s.\n", option->optionString); 2859 return JNI_EINVAL; 2860 } 2861 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2862 // -XX:NonNMethodCodeHeapSize= 2863 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 2864 julong long_NonNMethodCodeHeapSize = 0; 2865 2866 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 2867 if (errcode != arg_in_range) { 2868 jio_fprintf(defaultStream::error_stream(), 2869 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 2870 return JNI_EINVAL; 2871 } 2872 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize); 2873 // -XX:ProfiledCodeHeapSize= 2874 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 2875 julong long_ProfiledCodeHeapSize = 0; 2876 2877 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 2878 if (errcode != arg_in_range) { 2879 jio_fprintf(defaultStream::error_stream(), 2880 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 2881 return JNI_EINVAL; 2882 } 2883 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize); 2884 // -XX:NonProfiledCodeHeapSizee= 2885 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 2886 julong long_NonProfiledCodeHeapSize = 0; 2887 2888 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 2889 if (errcode != arg_in_range) { 2890 jio_fprintf(defaultStream::error_stream(), 2891 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 2892 return JNI_EINVAL; 2893 } 2894 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize); 2895 //-XX:IncreaseFirstTierCompileThresholdAt= 2896 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2897 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2898 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2899 jio_fprintf(defaultStream::error_stream(), 2900 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2901 option->optionString); 2902 return JNI_EINVAL; 2903 } 2904 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2905 // -green 2906 } else if (match_option(option, "-green")) { 2907 jio_fprintf(defaultStream::error_stream(), 2908 "Green threads support not available\n"); 2909 return JNI_EINVAL; 2910 // -native 2911 } else if (match_option(option, "-native")) { 2912 // HotSpot always uses native threads, ignore silently for compatibility 2913 // -Xsqnopause 2914 } else if (match_option(option, "-Xsqnopause")) { 2915 // EVM option, ignore silently for compatibility 2916 // -Xrs 2917 } else if (match_option(option, "-Xrs")) { 2918 // Classic/EVM option, new functionality 2919 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2920 } else if (match_option(option, "-Xusealtsigs")) { 2921 // change default internal VM signals used - lower case for back compat 2922 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2923 // -Xoptimize 2924 } else if (match_option(option, "-Xoptimize")) { 2925 // EVM option, ignore silently for compatibility 2926 // -Xprof 2927 } else if (match_option(option, "-Xprof")) { 2928 #if INCLUDE_FPROF 2929 _has_profile = true; 2930 #else // INCLUDE_FPROF 2931 jio_fprintf(defaultStream::error_stream(), 2932 "Flat profiling is not supported in this VM.\n"); 2933 return JNI_ERR; 2934 #endif // INCLUDE_FPROF 2935 // -Xconcurrentio 2936 } else if (match_option(option, "-Xconcurrentio")) { 2937 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2938 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2939 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2940 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2941 FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2942 2943 // -Xinternalversion 2944 } else if (match_option(option, "-Xinternalversion")) { 2945 jio_fprintf(defaultStream::output_stream(), "%s\n", 2946 VM_Version::internal_vm_info_string()); 2947 vm_exit(0); 2948 #ifndef PRODUCT 2949 // -Xprintflags 2950 } else if (match_option(option, "-Xprintflags")) { 2951 CommandLineFlags::printFlags(tty, false); 2952 vm_exit(0); 2953 #endif 2954 // -D 2955 } else if (match_option(option, "-D", &tail)) { 2956 const char* value; 2957 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2958 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2959 // abort if -Djava.endorsed.dirs is set 2960 jio_fprintf(defaultStream::output_stream(), 2961 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2962 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2963 return JNI_EINVAL; 2964 } 2965 if (match_option(option, "-Djava.ext.dirs=", &value) && 2966 *value != '\0' && strcmp(value, "\"\"") != 0) { 2967 // abort if -Djava.ext.dirs is set 2968 jio_fprintf(defaultStream::output_stream(), 2969 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2970 return JNI_EINVAL; 2971 } 2972 2973 if (!add_property(tail)) { 2974 return JNI_ENOMEM; 2975 } 2976 // Out of the box management support 2977 if (match_option(option, "-Dcom.sun.management", &tail)) { 2978 #if INCLUDE_MANAGEMENT 2979 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2980 #else 2981 jio_fprintf(defaultStream::output_stream(), 2982 "-Dcom.sun.management is not supported in this VM.\n"); 2983 return JNI_ERR; 2984 #endif 2985 } 2986 // -Xint 2987 } else if (match_option(option, "-Xint")) { 2988 set_mode_flags(_int); 2989 // -Xmixed 2990 } else if (match_option(option, "-Xmixed")) { 2991 set_mode_flags(_mixed); 2992 // -Xcomp 2993 } else if (match_option(option, "-Xcomp")) { 2994 // for testing the compiler; turn off all flags that inhibit compilation 2995 set_mode_flags(_comp); 2996 // -Xshare:dump 2997 } else if (match_option(option, "-Xshare:dump")) { 2998 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2999 set_mode_flags(_int); // Prevent compilation, which creates objects 3000 // -Xshare:on 3001 } else if (match_option(option, "-Xshare:on")) { 3002 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3003 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3004 // -Xshare:auto 3005 } else if (match_option(option, "-Xshare:auto")) { 3006 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3007 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3008 // -Xshare:off 3009 } else if (match_option(option, "-Xshare:off")) { 3010 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 3011 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3012 // -Xverify 3013 } else if (match_option(option, "-Xverify", &tail)) { 3014 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3015 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 3016 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3017 } else if (strcmp(tail, ":remote") == 0) { 3018 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3019 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3020 } else if (strcmp(tail, ":none") == 0) { 3021 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3022 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 3023 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3024 return JNI_EINVAL; 3025 } 3026 // -Xdebug 3027 } else if (match_option(option, "-Xdebug")) { 3028 // note this flag has been used, then ignore 3029 set_xdebug_mode(true); 3030 // -Xnoagent 3031 } else if (match_option(option, "-Xnoagent")) { 3032 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3033 } else if (match_option(option, "-Xboundthreads")) { 3034 // Ignore silently for compatibility 3035 } else if (match_option(option, "-Xloggc:", &tail)) { 3036 // Redirect GC output to the file. -Xloggc:<filename> 3037 // ostream_init_log(), when called will use this filename 3038 // to initialize a fileStream. 3039 _gc_log_filename = os::strdup_check_oom(tail); 3040 if (!is_filename_valid(_gc_log_filename)) { 3041 jio_fprintf(defaultStream::output_stream(), 3042 "Invalid file name for use with -Xloggc: Filename can only contain the " 3043 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 3044 "Note %%p or %%t can only be used once\n", _gc_log_filename); 3045 return JNI_EINVAL; 3046 } 3047 FLAG_SET_CMDLINE(bool, PrintGC, true); 3048 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 3049 3050 // JNI hooks 3051 } else if (match_option(option, "-Xcheck", &tail)) { 3052 if (!strcmp(tail, ":jni")) { 3053 #if !INCLUDE_JNI_CHECK 3054 warning("JNI CHECKING is not supported in this VM"); 3055 #else 3056 CheckJNICalls = true; 3057 #endif // INCLUDE_JNI_CHECK 3058 } else if (is_bad_option(option, args->ignoreUnrecognized, 3059 "check")) { 3060 return JNI_EINVAL; 3061 } 3062 } else if (match_option(option, "vfprintf")) { 3063 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3064 } else if (match_option(option, "exit")) { 3065 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3066 } else if (match_option(option, "abort")) { 3067 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3068 // -XX:+AggressiveHeap 3069 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3070 3071 // This option inspects the machine and attempts to set various 3072 // parameters to be optimal for long-running, memory allocation 3073 // intensive jobs. It is intended for machines with large 3074 // amounts of cpu and memory. 3075 3076 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 3077 // VM, but we may not be able to represent the total physical memory 3078 // available (like having 8gb of memory on a box but using a 32bit VM). 3079 // Thus, we need to make sure we're using a julong for intermediate 3080 // calculations. 3081 julong initHeapSize; 3082 julong total_memory = os::physical_memory(); 3083 3084 if (total_memory < (julong)256*M) { 3085 jio_fprintf(defaultStream::error_stream(), 3086 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 3087 vm_exit(1); 3088 } 3089 3090 // The heap size is half of available memory, or (at most) 3091 // all of possible memory less 160mb (leaving room for the OS 3092 // when using ISM). This is the maximum; because adaptive sizing 3093 // is turned on below, the actual space used may be smaller. 3094 3095 initHeapSize = MIN2(total_memory / (julong)2, 3096 total_memory - (julong)160*M); 3097 3098 initHeapSize = limit_by_allocatable_memory(initHeapSize); 3099 3100 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 3101 FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize); 3102 FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize); 3103 // Currently the minimum size and the initial heap sizes are the same. 3104 set_min_heap_size(initHeapSize); 3105 } 3106 if (FLAG_IS_DEFAULT(NewSize)) { 3107 // Make the young generation 3/8ths of the total heap. 3108 FLAG_SET_CMDLINE(size_t, NewSize, 3109 ((julong)MaxHeapSize / (julong)8) * (julong)3); 3110 FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize); 3111 } 3112 3113 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 3114 FLAG_SET_DEFAULT(UseLargePages, true); 3115 #endif 3116 3117 // Increase some data structure sizes for efficiency 3118 FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize); 3119 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3120 FLAG_SET_CMDLINE(size_t, TLABSize, 256*K); 3121 3122 // See the OldPLABSize comment below, but replace 'after promotion' 3123 // with 'after copying'. YoungPLABSize is the size of the survivor 3124 // space per-gc-thread buffers. The default is 4kw. 3125 FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256*K); // Note: this is in words 3126 3127 // OldPLABSize is the size of the buffers in the old gen that 3128 // UseParallelGC uses to promote live data that doesn't fit in the 3129 // survivor spaces. At any given time, there's one for each gc thread. 3130 // The default size is 1kw. These buffers are rarely used, since the 3131 // survivor spaces are usually big enough. For specjbb, however, there 3132 // are occasions when there's lots of live data in the young gen 3133 // and we end up promoting some of it. We don't have a definite 3134 // explanation for why bumping OldPLABSize helps, but the theory 3135 // is that a bigger PLAB results in retaining something like the 3136 // original allocation order after promotion, which improves mutator 3137 // locality. A minor effect may be that larger PLABs reduce the 3138 // number of PLAB allocation events during gc. The value of 8kw 3139 // was arrived at by experimenting with specjbb. 3140 FLAG_SET_CMDLINE(size_t, OldPLABSize, 8*K); // Note: this is in words 3141 3142 // Enable parallel GC and adaptive generation sizing 3143 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 3144 FLAG_SET_DEFAULT(ParallelGCThreads, 3145 Abstract_VM_Version::parallel_worker_threads()); 3146 3147 // Encourage steady state memory management 3148 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 3149 3150 // This appears to improve mutator locality 3151 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3152 3153 // Get around early Solaris scheduling bug 3154 // (affinity vs other jobs on system) 3155 // but disallow DR and offlining (5008695). 3156 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 3157 3158 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3159 // and the last option wins. 3160 } else if (match_option(option, "-XX:+NeverTenure")) { 3161 FLAG_SET_CMDLINE(bool, NeverTenure, true); 3162 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3163 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1); 3164 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3165 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3166 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3167 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 3168 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3169 uintx max_tenuring_thresh = 0; 3170 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3171 jio_fprintf(defaultStream::error_stream(), 3172 "Improperly specified VM option 'MaxTenuringThreshold=%s'\n", tail); 3173 return JNI_EINVAL; 3174 } 3175 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh); 3176 3177 if (MaxTenuringThreshold == 0) { 3178 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3179 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3180 } else { 3181 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3182 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3183 } 3184 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3185 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3186 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3187 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3188 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3189 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3190 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3191 #if defined(DTRACE_ENABLED) 3192 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3193 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3194 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3195 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3196 #else // defined(DTRACE_ENABLED) 3197 jio_fprintf(defaultStream::error_stream(), 3198 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3199 return JNI_EINVAL; 3200 #endif // defined(DTRACE_ENABLED) 3201 #ifdef ASSERT 3202 } else if (match_option(option, "-XX:+FullGCALot")) { 3203 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3204 // disable scavenge before parallel mark-compact 3205 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3206 #endif 3207 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3208 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3209 julong stack_size = 0; 3210 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3211 if (errcode != arg_in_range) { 3212 jio_fprintf(defaultStream::error_stream(), 3213 "Invalid mark stack size: %s\n", option->optionString); 3214 describe_range_error(errcode); 3215 return JNI_EINVAL; 3216 } 3217 jio_fprintf(defaultStream::error_stream(), 3218 "Please use -XX:MarkStackSize in place of " 3219 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n"); 3220 FLAG_SET_CMDLINE(size_t, MarkStackSize, stack_size); 3221 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3222 julong max_stack_size = 0; 3223 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3224 if (errcode != arg_in_range) { 3225 jio_fprintf(defaultStream::error_stream(), 3226 "Invalid maximum mark stack size: %s\n", 3227 option->optionString); 3228 describe_range_error(errcode); 3229 return JNI_EINVAL; 3230 } 3231 jio_fprintf(defaultStream::error_stream(), 3232 "Please use -XX:MarkStackSizeMax in place of " 3233 "-XX:CMSMarkStackSizeMax in the future\n"); 3234 FLAG_SET_CMDLINE(size_t, MarkStackSizeMax, max_stack_size); 3235 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3236 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3237 uintx conc_threads = 0; 3238 if (!parse_uintx(tail, &conc_threads, 1)) { 3239 jio_fprintf(defaultStream::error_stream(), 3240 "Invalid concurrent threads: %s\n", option->optionString); 3241 return JNI_EINVAL; 3242 } 3243 jio_fprintf(defaultStream::error_stream(), 3244 "Please use -XX:ConcGCThreads in place of " 3245 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n"); 3246 FLAG_SET_CMDLINE(uint, ConcGCThreads, conc_threads); 3247 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3248 julong max_direct_memory_size = 0; 3249 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3250 if (errcode != arg_in_range) { 3251 jio_fprintf(defaultStream::error_stream(), 3252 "Invalid maximum direct memory size: %s\n", 3253 option->optionString); 3254 describe_range_error(errcode); 3255 return JNI_EINVAL; 3256 } 3257 FLAG_SET_CMDLINE(size_t, MaxDirectMemorySize, max_direct_memory_size); 3258 #if !INCLUDE_MANAGEMENT 3259 } else if (match_option(option, "-XX:+ManagementServer")) { 3260 jio_fprintf(defaultStream::error_stream(), 3261 "ManagementServer is not supported in this VM.\n"); 3262 return JNI_ERR; 3263 #endif // INCLUDE_MANAGEMENT 3264 // CreateMinidumpOnCrash is removed, and replaced by CreateCoredumpOnCrash 3265 } else if (match_option(option, "-XX:+CreateMinidumpOnCrash")) { 3266 FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, true); 3267 jio_fprintf(defaultStream::output_stream(), 3268 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is on\n"); 3269 } else if (match_option(option, "-XX:-CreateMinidumpOnCrash")) { 3270 FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, false); 3271 jio_fprintf(defaultStream::output_stream(), 3272 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is off\n"); 3273 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3274 // Skip -XX:Flags= since that case has already been handled 3275 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3276 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3277 return JNI_EINVAL; 3278 } 3279 } 3280 // Unknown option 3281 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3282 return JNI_ERR; 3283 } 3284 } 3285 3286 // PrintSharedArchiveAndExit will turn on 3287 // -Xshare:on 3288 // -XX:+TraceClassPaths 3289 if (PrintSharedArchiveAndExit) { 3290 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3291 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3292 FLAG_SET_CMDLINE(bool, TraceClassPaths, true); 3293 } 3294 3295 // Change the default value for flags which have different default values 3296 // when working with older JDKs. 3297 #ifdef LINUX 3298 if (JDK_Version::current().compare_major(6) <= 0 && 3299 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3300 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3301 } 3302 #endif // LINUX 3303 fix_appclasspath(); 3304 return JNI_OK; 3305 } 3306 3307 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3308 // 3309 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3310 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3311 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3312 // path is treated as the current directory. 3313 // 3314 // This causes problems with CDS, which requires that all directories specified in the classpath 3315 // must be empty. In most cases, applications do NOT want to load classes from the current 3316 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3317 // scripts compatible with CDS. 3318 void Arguments::fix_appclasspath() { 3319 if (IgnoreEmptyClassPaths) { 3320 const char separator = *os::path_separator(); 3321 const char* src = _java_class_path->value(); 3322 3323 // skip over all the leading empty paths 3324 while (*src == separator) { 3325 src ++; 3326 } 3327 3328 char* copy = os::strdup_check_oom(src, mtInternal); 3329 3330 // trim all trailing empty paths 3331 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3332 *tail = '\0'; 3333 } 3334 3335 char from[3] = {separator, separator, '\0'}; 3336 char to [2] = {separator, '\0'}; 3337 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3338 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3339 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3340 } 3341 3342 _java_class_path->set_value(copy); 3343 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3344 } 3345 3346 if (!PrintSharedArchiveAndExit) { 3347 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value()); 3348 } 3349 } 3350 3351 static bool has_jar_files(const char* directory) { 3352 DIR* dir = os::opendir(directory); 3353 if (dir == NULL) return false; 3354 3355 struct dirent *entry; 3356 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 3357 bool hasJarFile = false; 3358 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3359 const char* name = entry->d_name; 3360 const char* ext = name + strlen(name) - 4; 3361 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3362 } 3363 FREE_C_HEAP_ARRAY(char, dbuf); 3364 os::closedir(dir); 3365 return hasJarFile ; 3366 } 3367 3368 static int check_non_empty_dirs(const char* path) { 3369 const char separator = *os::path_separator(); 3370 const char* const end = path + strlen(path); 3371 int nonEmptyDirs = 0; 3372 while (path < end) { 3373 const char* tmp_end = strchr(path, separator); 3374 if (tmp_end == NULL) { 3375 if (has_jar_files(path)) { 3376 nonEmptyDirs++; 3377 jio_fprintf(defaultStream::output_stream(), 3378 "Non-empty directory: %s\n", path); 3379 } 3380 path = end; 3381 } else { 3382 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 3383 memcpy(dirpath, path, tmp_end - path); 3384 dirpath[tmp_end - path] = '\0'; 3385 if (has_jar_files(dirpath)) { 3386 nonEmptyDirs++; 3387 jio_fprintf(defaultStream::output_stream(), 3388 "Non-empty directory: %s\n", dirpath); 3389 } 3390 FREE_C_HEAP_ARRAY(char, dirpath); 3391 path = tmp_end + 1; 3392 } 3393 } 3394 return nonEmptyDirs; 3395 } 3396 3397 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3398 // check if the default lib/endorsed directory exists; if so, error 3399 char path[JVM_MAXPATHLEN]; 3400 const char* fileSep = os::file_separator(); 3401 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3402 3403 if (CheckEndorsedAndExtDirs) { 3404 int nonEmptyDirs = 0; 3405 // check endorsed directory 3406 nonEmptyDirs += check_non_empty_dirs(path); 3407 // check the extension directories 3408 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3409 if (nonEmptyDirs > 0) { 3410 return JNI_ERR; 3411 } 3412 } 3413 3414 DIR* dir = os::opendir(path); 3415 if (dir != NULL) { 3416 jio_fprintf(defaultStream::output_stream(), 3417 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3418 "in modular form will be supported via the concept of upgradeable modules.\n"); 3419 os::closedir(dir); 3420 return JNI_ERR; 3421 } 3422 3423 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3424 dir = os::opendir(path); 3425 if (dir != NULL) { 3426 jio_fprintf(defaultStream::output_stream(), 3427 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3428 "Use -classpath instead.\n."); 3429 os::closedir(dir); 3430 return JNI_ERR; 3431 } 3432 3433 if (scp_assembly_required) { 3434 // Assemble the bootclasspath elements into the final path. 3435 Arguments::set_sysclasspath(scp_p->combined_path()); 3436 } 3437 3438 // This must be done after all arguments have been processed. 3439 // java_compiler() true means set to "NONE" or empty. 3440 if (java_compiler() && !xdebug_mode()) { 3441 // For backwards compatibility, we switch to interpreted mode if 3442 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3443 // not specified. 3444 set_mode_flags(_int); 3445 } 3446 3447 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3448 // but like -Xint, leave compilation thresholds unaffected. 3449 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3450 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3451 set_mode_flags(_int); 3452 } 3453 3454 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3455 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3456 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3457 } 3458 3459 #ifndef COMPILER2 3460 // Don't degrade server performance for footprint 3461 if (FLAG_IS_DEFAULT(UseLargePages) && 3462 MaxHeapSize < LargePageHeapSizeThreshold) { 3463 // No need for large granularity pages w/small heaps. 3464 // Note that large pages are enabled/disabled for both the 3465 // Java heap and the code cache. 3466 FLAG_SET_DEFAULT(UseLargePages, false); 3467 } 3468 3469 #else 3470 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3471 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3472 } 3473 #endif 3474 3475 #ifndef TIERED 3476 // Tiered compilation is undefined. 3477 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3478 #endif 3479 3480 // If we are running in a headless jre, force java.awt.headless property 3481 // to be true unless the property has already been set. 3482 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3483 if (os::is_headless_jre()) { 3484 const char* headless = Arguments::get_property("java.awt.headless"); 3485 if (headless == NULL) { 3486 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3487 if (headless_env == NULL) { 3488 if (!add_property("java.awt.headless=true")) { 3489 return JNI_ENOMEM; 3490 } 3491 } else { 3492 char buffer[256]; 3493 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env); 3494 if (!add_property(buffer)) { 3495 return JNI_ENOMEM; 3496 } 3497 } 3498 } 3499 } 3500 3501 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) { 3502 // CMS can only be used with ParNew 3503 FLAG_SET_ERGO(bool, UseParNewGC, true); 3504 } 3505 3506 if (!check_vm_args_consistency()) { 3507 return JNI_ERR; 3508 } 3509 3510 return JNI_OK; 3511 } 3512 3513 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3514 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3515 scp_assembly_required_p); 3516 } 3517 3518 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3519 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3520 scp_assembly_required_p); 3521 } 3522 3523 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3524 char *buffer = ::getenv(name); 3525 3526 // Don't check this variable if user has special privileges 3527 // (e.g. unix su command). 3528 if (buffer == NULL || os::have_special_privileges()) { 3529 return JNI_OK; 3530 } 3531 3532 if ((buffer = os::strdup(buffer)) == NULL) { 3533 return JNI_ENOMEM; 3534 } 3535 3536 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array 3537 jio_fprintf(defaultStream::error_stream(), 3538 "Picked up %s: %s\n", name, buffer); 3539 char* rd = buffer; // pointer to the input string (rd) 3540 while (true) { // repeat for all options in the input string 3541 while (isspace(*rd)) rd++; // skip whitespace 3542 if (*rd == 0) break; // we re done when the input string is read completely 3543 3544 // The output, option string, overwrites the input string. 3545 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3546 // input string (rd). 3547 char* wrt = rd; 3548 3549 JavaVMOption option; 3550 option.optionString = wrt; 3551 options->append(option); // Fill in option 3552 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3553 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3554 int quote = *rd; // matching quote to look for 3555 rd++; // don't copy open quote 3556 while (*rd != quote) { // include everything (even spaces) up until quote 3557 if (*rd == 0) { // string termination means unmatched string 3558 jio_fprintf(defaultStream::error_stream(), 3559 "Unmatched quote in %s\n", name); 3560 delete options; 3561 os::free(buffer); 3562 return JNI_ERR; 3563 } 3564 *wrt++ = *rd++; // copy to option string 3565 } 3566 rd++; // don't copy close quote 3567 } else { 3568 *wrt++ = *rd++; // copy to option string 3569 } 3570 } 3571 // Need to check if we're done before writing a NULL, 3572 // because the write could be to the byte that rd is pointing to. 3573 if (*rd++ == 0) { 3574 *wrt = 0; 3575 break; 3576 } 3577 *wrt = 0; // Zero terminate option 3578 } 3579 JavaVMOption* options_arr = 3580 NEW_C_HEAP_ARRAY_RETURN_NULL(JavaVMOption, options->length(), mtInternal); 3581 if (options_arr == NULL) { 3582 delete options; 3583 os::free(buffer); 3584 return JNI_ENOMEM; 3585 } 3586 for (int i = 0; i < options->length(); i++) { 3587 options_arr[i] = options->at(i); 3588 } 3589 3590 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3591 JavaVMInitArgs vm_args; 3592 vm_args.version = JNI_VERSION_1_2; 3593 vm_args.options = options_arr; 3594 vm_args.nOptions = options->length(); 3595 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3596 3597 if (PrintVMOptions) { 3598 const char* tail; 3599 for (int i = 0; i < vm_args.nOptions; i++) { 3600 const JavaVMOption *option = vm_args.options + i; 3601 if (match_option(option, "-XX:", &tail)) { 3602 logOption(tail); 3603 } 3604 } 3605 } 3606 3607 jint result = parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, 3608 Flag::ENVIRON_VAR); 3609 FREE_C_HEAP_ARRAY(JavaVMOption, options_arr); 3610 delete options; 3611 os::free(buffer); 3612 return result; 3613 } 3614 3615 void Arguments::set_shared_spaces_flags() { 3616 if (DumpSharedSpaces) { 3617 if (RequireSharedSpaces) { 3618 warning("cannot dump shared archive while using shared archive"); 3619 } 3620 UseSharedSpaces = false; 3621 #ifdef _LP64 3622 if (!UseCompressedOops || !UseCompressedClassPointers) { 3623 vm_exit_during_initialization( 3624 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3625 } 3626 } else { 3627 if (!UseCompressedOops || !UseCompressedClassPointers) { 3628 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3629 } 3630 #endif 3631 } 3632 } 3633 3634 #if !INCLUDE_ALL_GCS 3635 static void force_serial_gc() { 3636 FLAG_SET_DEFAULT(UseSerialGC, true); 3637 UNSUPPORTED_GC_OPTION(UseG1GC); 3638 UNSUPPORTED_GC_OPTION(UseParallelGC); 3639 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3640 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3641 UNSUPPORTED_GC_OPTION(UseParNewGC); 3642 } 3643 #endif // INCLUDE_ALL_GCS 3644 3645 // Sharing support 3646 // Construct the path to the archive 3647 static char* get_shared_archive_path() { 3648 char *shared_archive_path; 3649 if (SharedArchiveFile == NULL) { 3650 char jvm_path[JVM_MAXPATHLEN]; 3651 os::jvm_path(jvm_path, sizeof(jvm_path)); 3652 char *end = strrchr(jvm_path, *os::file_separator()); 3653 if (end != NULL) *end = '\0'; 3654 size_t jvm_path_len = strlen(jvm_path); 3655 size_t file_sep_len = strlen(os::file_separator()); 3656 const size_t len = jvm_path_len + file_sep_len + 20; 3657 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal); 3658 if (shared_archive_path != NULL) { 3659 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 3660 jvm_path, os::file_separator()); 3661 } 3662 } else { 3663 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal); 3664 } 3665 return shared_archive_path; 3666 } 3667 3668 #ifndef PRODUCT 3669 // Determine whether LogVMOutput should be implicitly turned on. 3670 static bool use_vm_log() { 3671 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3672 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3673 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3674 PrintAssembly || TraceDeoptimization || TraceDependencies || 3675 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3676 return true; 3677 } 3678 3679 #ifdef COMPILER1 3680 if (PrintC1Statistics) { 3681 return true; 3682 } 3683 #endif // COMPILER1 3684 3685 #ifdef COMPILER2 3686 if (PrintOptoAssembly || PrintOptoStatistics) { 3687 return true; 3688 } 3689 #endif // COMPILER2 3690 3691 return false; 3692 } 3693 #endif // PRODUCT 3694 3695 // Parse entry point called from JNI_CreateJavaVM 3696 3697 jint Arguments::parse(const JavaVMInitArgs* args) { 3698 3699 // Remaining part of option string 3700 const char* tail; 3701 3702 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3703 const char* hotspotrc = ".hotspotrc"; 3704 bool settings_file_specified = false; 3705 bool needs_hotspotrc_warning = false; 3706 3707 const char* flags_file; 3708 int index; 3709 for (index = 0; index < args->nOptions; index++) { 3710 const JavaVMOption *option = args->options + index; 3711 if (ArgumentsExt::process_options(option)) { 3712 continue; 3713 } 3714 if (match_option(option, "-XX:Flags=", &tail)) { 3715 flags_file = tail; 3716 settings_file_specified = true; 3717 continue; 3718 } 3719 if (match_option(option, "-XX:+PrintVMOptions")) { 3720 PrintVMOptions = true; 3721 continue; 3722 } 3723 if (match_option(option, "-XX:-PrintVMOptions")) { 3724 PrintVMOptions = false; 3725 continue; 3726 } 3727 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3728 IgnoreUnrecognizedVMOptions = true; 3729 continue; 3730 } 3731 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3732 IgnoreUnrecognizedVMOptions = false; 3733 continue; 3734 } 3735 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3736 CommandLineFlags::printFlags(tty, false); 3737 vm_exit(0); 3738 } 3739 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3740 #if INCLUDE_NMT 3741 // The launcher did not setup nmt environment variable properly. 3742 if (!MemTracker::check_launcher_nmt_support(tail)) { 3743 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3744 } 3745 3746 // Verify if nmt option is valid. 3747 if (MemTracker::verify_nmt_option()) { 3748 // Late initialization, still in single-threaded mode. 3749 if (MemTracker::tracking_level() >= NMT_summary) { 3750 MemTracker::init(); 3751 } 3752 } else { 3753 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3754 } 3755 continue; 3756 #else 3757 jio_fprintf(defaultStream::error_stream(), 3758 "Native Memory Tracking is not supported in this VM\n"); 3759 return JNI_ERR; 3760 #endif 3761 } 3762 3763 #ifndef PRODUCT 3764 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3765 CommandLineFlags::printFlags(tty, true); 3766 vm_exit(0); 3767 } 3768 #endif 3769 } 3770 3771 if (IgnoreUnrecognizedVMOptions) { 3772 // uncast const to modify the flag args->ignoreUnrecognized 3773 *(jboolean*)(&args->ignoreUnrecognized) = true; 3774 } 3775 3776 // Parse specified settings file 3777 if (settings_file_specified) { 3778 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3779 return JNI_EINVAL; 3780 } 3781 } else { 3782 #ifdef ASSERT 3783 // Parse default .hotspotrc settings file 3784 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3785 return JNI_EINVAL; 3786 } 3787 #else 3788 struct stat buf; 3789 if (os::stat(hotspotrc, &buf) == 0) { 3790 needs_hotspotrc_warning = true; 3791 } 3792 #endif 3793 } 3794 3795 if (PrintVMOptions) { 3796 for (index = 0; index < args->nOptions; index++) { 3797 const JavaVMOption *option = args->options + index; 3798 if (match_option(option, "-XX:", &tail)) { 3799 logOption(tail); 3800 } 3801 } 3802 } 3803 3804 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3805 jint result = parse_vm_init_args(args); 3806 if (result != JNI_OK) { 3807 return result; 3808 } 3809 3810 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3811 SharedArchivePath = get_shared_archive_path(); 3812 if (SharedArchivePath == NULL) { 3813 return JNI_ENOMEM; 3814 } 3815 3816 // Set up VerifySharedSpaces 3817 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 3818 VerifySharedSpaces = true; 3819 } 3820 3821 // Delay warning until here so that we've had a chance to process 3822 // the -XX:-PrintWarnings flag 3823 if (needs_hotspotrc_warning) { 3824 warning("%s file is present but has been ignored. " 3825 "Run with -XX:Flags=%s to load the file.", 3826 hotspotrc, hotspotrc); 3827 } 3828 3829 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 3830 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3831 #endif 3832 3833 ArgumentsExt::report_unsupported_options(); 3834 3835 #ifndef PRODUCT 3836 if (TraceBytecodesAt != 0) { 3837 TraceBytecodes = true; 3838 } 3839 if (CountCompiledCalls) { 3840 if (UseCounterDecay) { 3841 warning("UseCounterDecay disabled because CountCalls is set"); 3842 UseCounterDecay = false; 3843 } 3844 } 3845 #endif // PRODUCT 3846 3847 if (ScavengeRootsInCode == 0) { 3848 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3849 warning("forcing ScavengeRootsInCode non-zero"); 3850 } 3851 ScavengeRootsInCode = 1; 3852 } 3853 3854 if (PrintGCDetails) { 3855 // Turn on -verbose:gc options as well 3856 PrintGC = true; 3857 } 3858 3859 // Set object alignment values. 3860 set_object_alignment(); 3861 3862 #if !INCLUDE_ALL_GCS 3863 force_serial_gc(); 3864 #endif // INCLUDE_ALL_GCS 3865 #if !INCLUDE_CDS 3866 if (DumpSharedSpaces || RequireSharedSpaces) { 3867 jio_fprintf(defaultStream::error_stream(), 3868 "Shared spaces are not supported in this VM\n"); 3869 return JNI_ERR; 3870 } 3871 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3872 warning("Shared spaces are not supported in this VM"); 3873 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3874 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3875 } 3876 no_shared_spaces("CDS Disabled"); 3877 #endif // INCLUDE_CDS 3878 3879 return JNI_OK; 3880 } 3881 3882 jint Arguments::apply_ergo() { 3883 3884 // Set flags based on ergonomics. 3885 set_ergonomics_flags(); 3886 3887 set_shared_spaces_flags(); 3888 3889 // Check the GC selections again. 3890 if (!check_gc_consistency()) { 3891 return JNI_EINVAL; 3892 } 3893 3894 if (TieredCompilation) { 3895 set_tiered_flags(); 3896 } else { 3897 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3898 if (CompilationPolicyChoice >= 2) { 3899 vm_exit_during_initialization( 3900 "Incompatible compilation policy selected", NULL); 3901 } 3902 // Scale CompileThreshold 3903 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 3904 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 3905 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 3906 } 3907 } 3908 3909 #ifdef COMPILER2 3910 #ifndef PRODUCT 3911 if (PrintIdealGraphLevel > 0) { 3912 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 3913 } 3914 #endif 3915 #endif 3916 3917 // Set heap size based on available physical memory 3918 set_heap_size(); 3919 3920 ArgumentsExt::set_gc_specific_flags(); 3921 3922 // Initialize Metaspace flags and alignments 3923 Metaspace::ergo_initialize(); 3924 3925 // Set bytecode rewriting flags 3926 set_bytecode_flags(); 3927 3928 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 3929 set_aggressive_opts_flags(); 3930 3931 // Turn off biased locking for locking debug mode flags, 3932 // which are subtly different from each other but neither works with 3933 // biased locking 3934 if (UseHeavyMonitors 3935 #ifdef COMPILER1 3936 || !UseFastLocking 3937 #endif // COMPILER1 3938 ) { 3939 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3940 // flag set to true on command line; warn the user that they 3941 // can't enable biased locking here 3942 warning("Biased Locking is not supported with locking debug flags" 3943 "; ignoring UseBiasedLocking flag." ); 3944 } 3945 UseBiasedLocking = false; 3946 } 3947 3948 #ifdef ZERO 3949 // Clear flags not supported on zero. 3950 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3951 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3952 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3953 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3954 #endif // CC_INTERP 3955 3956 #ifdef COMPILER2 3957 if (!EliminateLocks) { 3958 EliminateNestedLocks = false; 3959 } 3960 if (!Inline) { 3961 IncrementalInline = false; 3962 } 3963 #ifndef PRODUCT 3964 if (!IncrementalInline) { 3965 AlwaysIncrementalInline = false; 3966 } 3967 #endif 3968 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 3969 // nothing to use the profiling, turn if off 3970 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 3971 } 3972 #endif 3973 3974 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3975 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3976 DebugNonSafepoints = true; 3977 } 3978 3979 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3980 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3981 } 3982 3983 #ifndef PRODUCT 3984 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3985 if (use_vm_log()) { 3986 LogVMOutput = true; 3987 } 3988 } 3989 #endif // PRODUCT 3990 3991 if (PrintCommandLineFlags) { 3992 CommandLineFlags::printSetFlags(tty); 3993 } 3994 3995 // Apply CPU specific policy for the BiasedLocking 3996 if (UseBiasedLocking) { 3997 if (!VM_Version::use_biased_locking() && 3998 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3999 UseBiasedLocking = false; 4000 } 4001 } 4002 #ifdef COMPILER2 4003 if (!UseBiasedLocking || EmitSync != 0) { 4004 UseOptoBiasInlining = false; 4005 } 4006 #endif 4007 4008 return JNI_OK; 4009 } 4010 4011 jint Arguments::adjust_after_os() { 4012 if (UseNUMA) { 4013 if (UseParallelGC || UseParallelOldGC) { 4014 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4015 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4016 } 4017 } 4018 // UseNUMAInterleaving is set to ON for all collectors and 4019 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4020 // such as the parallel collector for Linux and Solaris will 4021 // interleave old gen and survivor spaces on top of NUMA 4022 // allocation policy for the eden space. 4023 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4024 // all platforms and ParallelGC on Windows will interleave all 4025 // of the heap spaces across NUMA nodes. 4026 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4027 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4028 } 4029 } 4030 return JNI_OK; 4031 } 4032 4033 int Arguments::PropertyList_count(SystemProperty* pl) { 4034 int count = 0; 4035 while(pl != NULL) { 4036 count++; 4037 pl = pl->next(); 4038 } 4039 return count; 4040 } 4041 4042 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4043 assert(key != NULL, "just checking"); 4044 SystemProperty* prop; 4045 for (prop = pl; prop != NULL; prop = prop->next()) { 4046 if (strcmp(key, prop->key()) == 0) return prop->value(); 4047 } 4048 return NULL; 4049 } 4050 4051 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4052 int count = 0; 4053 const char* ret_val = NULL; 4054 4055 while(pl != NULL) { 4056 if(count >= index) { 4057 ret_val = pl->key(); 4058 break; 4059 } 4060 count++; 4061 pl = pl->next(); 4062 } 4063 4064 return ret_val; 4065 } 4066 4067 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4068 int count = 0; 4069 char* ret_val = NULL; 4070 4071 while(pl != NULL) { 4072 if(count >= index) { 4073 ret_val = pl->value(); 4074 break; 4075 } 4076 count++; 4077 pl = pl->next(); 4078 } 4079 4080 return ret_val; 4081 } 4082 4083 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4084 SystemProperty* p = *plist; 4085 if (p == NULL) { 4086 *plist = new_p; 4087 } else { 4088 while (p->next() != NULL) { 4089 p = p->next(); 4090 } 4091 p->set_next(new_p); 4092 } 4093 } 4094 4095 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 4096 if (plist == NULL) 4097 return; 4098 4099 SystemProperty* new_p = new SystemProperty(k, v, true); 4100 PropertyList_add(plist, new_p); 4101 } 4102 4103 void Arguments::PropertyList_add(SystemProperty *element) { 4104 PropertyList_add(&_system_properties, element); 4105 } 4106 4107 // This add maintains unique property key in the list. 4108 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 4109 if (plist == NULL) 4110 return; 4111 4112 // If property key exist then update with new value. 4113 SystemProperty* prop; 4114 for (prop = *plist; prop != NULL; prop = prop->next()) { 4115 if (strcmp(k, prop->key()) == 0) { 4116 if (append) { 4117 prop->append_value(v); 4118 } else { 4119 prop->set_value(v); 4120 } 4121 return; 4122 } 4123 } 4124 4125 PropertyList_add(plist, k, v); 4126 } 4127 4128 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4129 // Returns true if all of the source pointed by src has been copied over to 4130 // the destination buffer pointed by buf. Otherwise, returns false. 4131 // Notes: 4132 // 1. If the length (buflen) of the destination buffer excluding the 4133 // NULL terminator character is not long enough for holding the expanded 4134 // pid characters, it also returns false instead of returning the partially 4135 // expanded one. 4136 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4137 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4138 char* buf, size_t buflen) { 4139 const char* p = src; 4140 char* b = buf; 4141 const char* src_end = &src[srclen]; 4142 char* buf_end = &buf[buflen - 1]; 4143 4144 while (p < src_end && b < buf_end) { 4145 if (*p == '%') { 4146 switch (*(++p)) { 4147 case '%': // "%%" ==> "%" 4148 *b++ = *p++; 4149 break; 4150 case 'p': { // "%p" ==> current process id 4151 // buf_end points to the character before the last character so 4152 // that we could write '\0' to the end of the buffer. 4153 size_t buf_sz = buf_end - b + 1; 4154 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4155 4156 // if jio_snprintf fails or the buffer is not long enough to hold 4157 // the expanded pid, returns false. 4158 if (ret < 0 || ret >= (int)buf_sz) { 4159 return false; 4160 } else { 4161 b += ret; 4162 assert(*b == '\0', "fail in copy_expand_pid"); 4163 if (p == src_end && b == buf_end + 1) { 4164 // reach the end of the buffer. 4165 return true; 4166 } 4167 } 4168 p++; 4169 break; 4170 } 4171 default : 4172 *b++ = '%'; 4173 } 4174 } else { 4175 *b++ = *p++; 4176 } 4177 } 4178 *b = '\0'; 4179 return (p == src_end); // return false if not all of the source was copied 4180 }