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/commandLineFlagConstraintList.hpp" 42 #include "runtime/commandLineFlagRangeList.hpp" 43 #include "runtime/globals.hpp" 44 #include "runtime/globals_extension.hpp" 45 #include "runtime/java.hpp" 46 #include "runtime/os.hpp" 47 #include "runtime/vm_version.hpp" 48 #include "services/management.hpp" 49 #include "services/memTracker.hpp" 50 #include "utilities/defaultStream.hpp" 51 #include "utilities/macros.hpp" 52 #include "utilities/stringUtils.hpp" 53 #if INCLUDE_ALL_GCS 54 #include "gc/cms/compactibleFreeListSpace.hpp" 55 #include "gc/g1/g1CollectedHeap.inline.hpp" 56 #include "gc/parallel/parallelScavengeHeap.hpp" 57 #endif // INCLUDE_ALL_GCS 58 59 // Note: This is a special bug reporting site for the JVM 60 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 61 #define DEFAULT_JAVA_LAUNCHER "generic" 62 63 #define UNSUPPORTED_GC_OPTION(gc) \ 64 do { \ 65 if (gc) { \ 66 if (FLAG_IS_CMDLINE(gc)) { \ 67 warning(#gc " is not supported in this VM. Using Serial GC."); \ 68 } \ 69 FLAG_SET_DEFAULT(gc, false); \ 70 } \ 71 } while(0) 72 73 char** Arguments::_jvm_flags_array = NULL; 74 int Arguments::_num_jvm_flags = 0; 75 char** Arguments::_jvm_args_array = NULL; 76 int Arguments::_num_jvm_args = 0; 77 char* Arguments::_java_command = NULL; 78 SystemProperty* Arguments::_system_properties = NULL; 79 const char* Arguments::_gc_log_filename = NULL; 80 bool Arguments::_has_profile = false; 81 size_t Arguments::_conservative_max_heap_alignment = 0; 82 size_t Arguments::_min_heap_size = 0; 83 uintx Arguments::_min_heap_free_ratio = 0; 84 uintx Arguments::_max_heap_free_ratio = 0; 85 Arguments::Mode Arguments::_mode = _mixed; 86 bool Arguments::_java_compiler = false; 87 bool Arguments::_xdebug_mode = false; 88 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 89 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 90 int Arguments::_sun_java_launcher_pid = -1; 91 bool Arguments::_sun_java_launcher_is_altjvm = false; 92 93 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 94 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 95 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 96 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 97 bool Arguments::_ClipInlining = ClipInlining; 98 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 99 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 100 101 char* Arguments::SharedArchivePath = NULL; 102 103 AgentLibraryList Arguments::_libraryList; 104 AgentLibraryList Arguments::_agentList; 105 106 abort_hook_t Arguments::_abort_hook = NULL; 107 exit_hook_t Arguments::_exit_hook = NULL; 108 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 109 110 111 SystemProperty *Arguments::_sun_boot_library_path = NULL; 112 SystemProperty *Arguments::_java_library_path = NULL; 113 SystemProperty *Arguments::_java_home = NULL; 114 SystemProperty *Arguments::_java_class_path = NULL; 115 SystemProperty *Arguments::_sun_boot_class_path = NULL; 116 117 char* Arguments::_ext_dirs = NULL; 118 119 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 120 // part of the option string. 121 static bool match_option(const JavaVMOption *option, const char* name, 122 const char** tail) { 123 int len = (int)strlen(name); 124 if (strncmp(option->optionString, name, len) == 0) { 125 *tail = option->optionString + len; 126 return true; 127 } else { 128 return false; 129 } 130 } 131 132 // Check if 'option' matches 'name'. No "tail" is allowed. 133 static bool match_option(const JavaVMOption *option, const char* name) { 134 const char* tail = NULL; 135 bool result = match_option(option, name, &tail); 136 if (tail != NULL && *tail == '\0') { 137 return result; 138 } else { 139 return false; 140 } 141 } 142 143 // Return true if any of the strings in null-terminated array 'names' matches. 144 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 145 // the option must match exactly. 146 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 147 bool tail_allowed) { 148 for (/* empty */; *names != NULL; ++names) { 149 if (match_option(option, *names, tail)) { 150 if (**tail == '\0' || tail_allowed && **tail == ':') { 151 return true; 152 } 153 } 154 } 155 return false; 156 } 157 158 static void logOption(const char* opt) { 159 if (PrintVMOptions) { 160 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 161 } 162 } 163 164 // Process java launcher properties. 165 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 166 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 167 // sun.java.launcher.pid is defined. 168 // Must do this before setting up other system properties, 169 // as some of them may depend on launcher type. 170 for (int index = 0; index < args->nOptions; index++) { 171 const JavaVMOption* option = args->options + index; 172 const char* tail; 173 174 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 175 process_java_launcher_argument(tail, option->extraInfo); 176 continue; 177 } 178 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 179 if (strcmp(tail, "true") == 0) { 180 _sun_java_launcher_is_altjvm = true; 181 } 182 continue; 183 } 184 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 185 _sun_java_launcher_pid = atoi(tail); 186 continue; 187 } 188 } 189 } 190 191 // Initialize system properties key and value. 192 void Arguments::init_system_properties() { 193 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 194 "Java Virtual Machine Specification", false)); 195 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 196 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 197 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 198 199 // Following are JVMTI agent writable properties. 200 // Properties values are set to NULL and they are 201 // os specific they are initialized in os::init_system_properties_values(). 202 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 203 _java_library_path = new SystemProperty("java.library.path", NULL, true); 204 _java_home = new SystemProperty("java.home", NULL, true); 205 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 206 207 _java_class_path = new SystemProperty("java.class.path", "", true); 208 209 // Add to System Property list. 210 PropertyList_add(&_system_properties, _sun_boot_library_path); 211 PropertyList_add(&_system_properties, _java_library_path); 212 PropertyList_add(&_system_properties, _java_home); 213 PropertyList_add(&_system_properties, _java_class_path); 214 PropertyList_add(&_system_properties, _sun_boot_class_path); 215 216 // Set OS specific system properties values 217 os::init_system_properties_values(); 218 } 219 220 // Update/Initialize System properties after JDK version number is known 221 void Arguments::init_version_specific_system_properties() { 222 enum { bufsz = 16 }; 223 char buffer[bufsz]; 224 const char* spec_vendor = "Sun Microsystems Inc."; 225 uint32_t spec_version = 0; 226 227 spec_vendor = "Oracle Corporation"; 228 spec_version = JDK_Version::current().major_version(); 229 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 230 231 PropertyList_add(&_system_properties, 232 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 233 PropertyList_add(&_system_properties, 234 new SystemProperty("java.vm.specification.version", buffer, false)); 235 PropertyList_add(&_system_properties, 236 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 237 } 238 239 /** 240 * Provide a slightly more user-friendly way of eliminating -XX flags. 241 * When a flag is eliminated, it can be added to this list in order to 242 * continue accepting this flag on the command-line, while issuing a warning 243 * and ignoring the value. Once the JDK version reaches the 'accept_until' 244 * limit, we flatly refuse to admit the existence of the flag. This allows 245 * a flag to die correctly over JDK releases using HSX. 246 * But now that HSX is no longer supported only options with a future 247 * accept_until value need to be listed, and the list can be pruned 248 * on each major release. 249 */ 250 typedef struct { 251 const char* name; 252 JDK_Version obsoleted_in; // when the flag went away 253 JDK_Version accept_until; // which version to start denying the existence 254 } ObsoleteFlag; 255 256 static ObsoleteFlag obsolete_jvm_flags[] = { 257 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 258 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 259 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 260 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 261 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 262 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 263 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 264 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) }, 265 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 266 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 267 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 268 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 269 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 270 #ifndef ZERO 271 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 272 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 273 #endif // ZERO 274 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 275 { "AdaptiveSizePausePolicy", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 276 { "ParallelGCRetainPLAB", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 277 { NULL, JDK_Version(0), JDK_Version(0) } 278 }; 279 280 // Returns true if the flag is obsolete and fits into the range specified 281 // for being ignored. In the case that the flag is ignored, the 'version' 282 // value is filled in with the version number when the flag became 283 // obsolete so that that value can be displayed to the user. 284 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 285 int i = 0; 286 assert(version != NULL, "Must provide a version buffer"); 287 while (obsolete_jvm_flags[i].name != NULL) { 288 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 289 // <flag>=xxx form 290 // [-|+]<flag> form 291 size_t len = strlen(flag_status.name); 292 if ((strncmp(flag_status.name, s, len) == 0) && 293 (strlen(s) == len)){ 294 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 295 *version = flag_status.obsoleted_in; 296 return true; 297 } 298 } 299 i++; 300 } 301 return false; 302 } 303 304 // Constructs the system class path (aka boot class path) from the following 305 // components, in order: 306 // 307 // prefix // from -Xbootclasspath/p:... 308 // base // from os::get_system_properties() or -Xbootclasspath= 309 // suffix // from -Xbootclasspath/a:... 310 // 311 // This could be AllStatic, but it isn't needed after argument processing is 312 // complete. 313 class SysClassPath: public StackObj { 314 public: 315 SysClassPath(const char* base); 316 ~SysClassPath(); 317 318 inline void set_base(const char* base); 319 inline void add_prefix(const char* prefix); 320 inline void add_suffix_to_prefix(const char* suffix); 321 inline void add_suffix(const char* suffix); 322 inline void reset_path(const char* base); 323 324 inline const char* get_base() const { return _items[_scp_base]; } 325 inline const char* get_prefix() const { return _items[_scp_prefix]; } 326 inline const char* get_suffix() const { return _items[_scp_suffix]; } 327 328 // Combine all the components into a single c-heap-allocated string; caller 329 // must free the string if/when no longer needed. 330 char* combined_path(); 331 332 private: 333 // Utility routines. 334 static char* add_to_path(const char* path, const char* str, bool prepend); 335 static char* add_jars_to_path(char* path, const char* directory); 336 337 inline void reset_item_at(int index); 338 339 // Array indices for the items that make up the sysclasspath. All except the 340 // base are allocated in the C heap and freed by this class. 341 enum { 342 _scp_prefix, // from -Xbootclasspath/p:... 343 _scp_base, // the default sysclasspath 344 _scp_suffix, // from -Xbootclasspath/a:... 345 _scp_nitems // the number of items, must be last. 346 }; 347 348 const char* _items[_scp_nitems]; 349 }; 350 351 SysClassPath::SysClassPath(const char* base) { 352 memset(_items, 0, sizeof(_items)); 353 _items[_scp_base] = base; 354 } 355 356 SysClassPath::~SysClassPath() { 357 // Free everything except the base. 358 for (int i = 0; i < _scp_nitems; ++i) { 359 if (i != _scp_base) reset_item_at(i); 360 } 361 } 362 363 inline void SysClassPath::set_base(const char* base) { 364 _items[_scp_base] = base; 365 } 366 367 inline void SysClassPath::add_prefix(const char* prefix) { 368 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 369 } 370 371 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 372 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 373 } 374 375 inline void SysClassPath::add_suffix(const char* suffix) { 376 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 377 } 378 379 inline void SysClassPath::reset_item_at(int index) { 380 assert(index < _scp_nitems && index != _scp_base, "just checking"); 381 if (_items[index] != NULL) { 382 FREE_C_HEAP_ARRAY(char, _items[index]); 383 _items[index] = NULL; 384 } 385 } 386 387 inline void SysClassPath::reset_path(const char* base) { 388 // Clear the prefix and suffix. 389 reset_item_at(_scp_prefix); 390 reset_item_at(_scp_suffix); 391 set_base(base); 392 } 393 394 //------------------------------------------------------------------------------ 395 396 397 // Combine the bootclasspath elements, some of which may be null, into a single 398 // c-heap-allocated string. 399 char* SysClassPath::combined_path() { 400 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 401 402 size_t lengths[_scp_nitems]; 403 size_t total_len = 0; 404 405 const char separator = *os::path_separator(); 406 407 // Get the lengths. 408 int i; 409 for (i = 0; i < _scp_nitems; ++i) { 410 if (_items[i] != NULL) { 411 lengths[i] = strlen(_items[i]); 412 // Include space for the separator char (or a NULL for the last item). 413 total_len += lengths[i] + 1; 414 } 415 } 416 assert(total_len > 0, "empty sysclasspath not allowed"); 417 418 // Copy the _items to a single string. 419 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 420 char* cp_tmp = cp; 421 for (i = 0; i < _scp_nitems; ++i) { 422 if (_items[i] != NULL) { 423 memcpy(cp_tmp, _items[i], lengths[i]); 424 cp_tmp += lengths[i]; 425 *cp_tmp++ = separator; 426 } 427 } 428 *--cp_tmp = '\0'; // Replace the extra separator. 429 return cp; 430 } 431 432 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 433 char* 434 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 435 char *cp; 436 437 assert(str != NULL, "just checking"); 438 if (path == NULL) { 439 size_t len = strlen(str) + 1; 440 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 441 memcpy(cp, str, len); // copy the trailing null 442 } else { 443 const char separator = *os::path_separator(); 444 size_t old_len = strlen(path); 445 size_t str_len = strlen(str); 446 size_t len = old_len + str_len + 2; 447 448 if (prepend) { 449 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 450 char* cp_tmp = cp; 451 memcpy(cp_tmp, str, str_len); 452 cp_tmp += str_len; 453 *cp_tmp = separator; 454 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 455 FREE_C_HEAP_ARRAY(char, path); 456 } else { 457 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 458 char* cp_tmp = cp + old_len; 459 *cp_tmp = separator; 460 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 461 } 462 } 463 return cp; 464 } 465 466 // Scan the directory and append any jar or zip files found to path. 467 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 468 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 469 DIR* dir = os::opendir(directory); 470 if (dir == NULL) return path; 471 472 char dir_sep[2] = { '\0', '\0' }; 473 size_t directory_len = strlen(directory); 474 const char fileSep = *os::file_separator(); 475 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 476 477 /* Scan the directory for jars/zips, appending them to path. */ 478 struct dirent *entry; 479 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 480 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 481 const char* name = entry->d_name; 482 const char* ext = name + strlen(name) - 4; 483 bool isJarOrZip = ext > name && 484 (os::file_name_strcmp(ext, ".jar") == 0 || 485 os::file_name_strcmp(ext, ".zip") == 0); 486 if (isJarOrZip) { 487 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 488 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 489 path = add_to_path(path, jarpath, false); 490 FREE_C_HEAP_ARRAY(char, jarpath); 491 } 492 } 493 FREE_C_HEAP_ARRAY(char, dbuf); 494 os::closedir(dir); 495 return path; 496 } 497 498 // Parses a memory size specification string. 499 static bool atomull(const char *s, julong* result) { 500 julong n = 0; 501 int args_read = 0; 502 bool is_hex = false; 503 // Skip leading 0[xX] for hexadecimal 504 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) { 505 s += 2; 506 is_hex = true; 507 args_read = sscanf(s, JULONG_FORMAT_X, &n); 508 } else { 509 args_read = sscanf(s, JULONG_FORMAT, &n); 510 } 511 if (args_read != 1) { 512 return false; 513 } 514 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) { 515 s++; 516 } 517 // 4705540: illegal if more characters are found after the first non-digit 518 if (strlen(s) > 1) { 519 return false; 520 } 521 switch (*s) { 522 case 'T': case 't': 523 *result = n * G * K; 524 // Check for overflow. 525 if (*result/((julong)G * K) != n) return false; 526 return true; 527 case 'G': case 'g': 528 *result = n * G; 529 if (*result/G != n) return false; 530 return true; 531 case 'M': case 'm': 532 *result = n * M; 533 if (*result/M != n) return false; 534 return true; 535 case 'K': case 'k': 536 *result = n * K; 537 if (*result/K != n) return false; 538 return true; 539 case '\0': 540 *result = n; 541 return true; 542 default: 543 return false; 544 } 545 } 546 547 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 548 if (size < min_size) return arg_too_small; 549 // Check that size will fit in a size_t (only relevant on 32-bit) 550 if (size > max_uintx) return arg_too_big; 551 return arg_in_range; 552 } 553 554 // Describe an argument out of range error 555 void Arguments::describe_range_error(ArgsRange errcode) { 556 switch(errcode) { 557 case arg_too_big: 558 jio_fprintf(defaultStream::error_stream(), 559 "The specified size exceeds the maximum " 560 "representable size.\n"); 561 break; 562 case arg_too_small: 563 case arg_unreadable: 564 case arg_in_range: 565 // do nothing for now 566 break; 567 default: 568 ShouldNotReachHere(); 569 } 570 } 571 572 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) { 573 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) { 574 return true; 575 } else { 576 return false; 577 } 578 } 579 580 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 581 double v; 582 if (sscanf(value, "%lf", &v) != 1) { 583 return false; 584 } 585 586 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) { 587 return true; 588 } 589 return false; 590 } 591 592 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 593 julong v; 594 int int_v; 595 intx intx_v; 596 bool is_neg = false; 597 // Check the sign first since atomull() parses only unsigned values. 598 if (*value == '-') { 599 if (CommandLineFlags::intxAt(name, &intx_v) != Flag::SUCCESS) { 600 return false; 601 } 602 value++; 603 is_neg = true; 604 } 605 if (!atomull(value, &v)) { 606 return false; 607 } 608 int_v = (int) v; 609 if (is_neg) { 610 int_v = -int_v; 611 } 612 if (CommandLineFlags::intAtPut(name, &int_v, origin) == Flag::SUCCESS) { 613 return true; 614 } 615 uint uint_v = (uint) v; 616 if (!is_neg && CommandLineFlags::uintAtPut(name, &uint_v, origin) == Flag::SUCCESS) { 617 return true; 618 } 619 intx_v = (intx) v; 620 if (is_neg) { 621 intx_v = -intx_v; 622 } 623 if (CommandLineFlags::intxAtPut(name, &intx_v, origin) == Flag::SUCCESS) { 624 return true; 625 } 626 uintx uintx_v = (uintx) v; 627 if (!is_neg && (CommandLineFlags::uintxAtPut(name, &uintx_v, origin) == Flag::SUCCESS)) { 628 return true; 629 } 630 uint64_t uint64_t_v = (uint64_t) v; 631 if (!is_neg && (CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin) == Flag::SUCCESS)) { 632 return true; 633 } 634 size_t size_t_v = (size_t) v; 635 if (!is_neg && (CommandLineFlags::size_tAtPut(name, &size_t_v, origin) == Flag::SUCCESS)) { 636 return true; 637 } 638 return false; 639 } 640 641 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 642 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false; 643 // Contract: CommandLineFlags always returns a pointer that needs freeing. 644 FREE_C_HEAP_ARRAY(char, value); 645 return true; 646 } 647 648 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 649 const char* old_value = ""; 650 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false; 651 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 652 size_t new_len = strlen(new_value); 653 const char* value; 654 char* free_this_too = NULL; 655 if (old_len == 0) { 656 value = new_value; 657 } else if (new_len == 0) { 658 value = old_value; 659 } else { 660 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 661 // each new setting adds another LINE to the switch: 662 sprintf(buf, "%s\n%s", old_value, new_value); 663 value = buf; 664 free_this_too = buf; 665 } 666 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 667 // CommandLineFlags always returns a pointer that needs freeing. 668 FREE_C_HEAP_ARRAY(char, value); 669 if (free_this_too != NULL) { 670 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 671 FREE_C_HEAP_ARRAY(char, free_this_too); 672 } 673 return true; 674 } 675 676 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 677 678 // range of acceptable characters spelled out for portability reasons 679 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 680 #define BUFLEN 255 681 char name[BUFLEN+1]; 682 char dummy; 683 684 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 685 return set_bool_flag(name, false, origin); 686 } 687 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 688 return set_bool_flag(name, true, origin); 689 } 690 691 char punct; 692 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 693 const char* value = strchr(arg, '=') + 1; 694 Flag* flag = Flag::find_flag(name, strlen(name)); 695 if (flag != NULL && flag->is_ccstr()) { 696 if (flag->ccstr_accumulates()) { 697 return append_to_string_flag(name, value, origin); 698 } else { 699 if (value[0] == '\0') { 700 value = NULL; 701 } 702 return set_string_flag(name, value, origin); 703 } 704 } 705 } 706 707 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 708 const char* value = strchr(arg, '=') + 1; 709 // -XX:Foo:=xxx will reset the string flag to the given value. 710 if (value[0] == '\0') { 711 value = NULL; 712 } 713 return set_string_flag(name, value, origin); 714 } 715 716 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 717 #define SIGNED_NUMBER_RANGE "[-0123456789]" 718 #define NUMBER_RANGE "[0123456789]" 719 char value[BUFLEN + 1]; 720 char value2[BUFLEN + 1]; 721 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 722 // Looks like a floating-point number -- try again with more lenient format string 723 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 724 return set_fp_numeric_flag(name, value, origin); 725 } 726 } 727 728 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 729 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 730 return set_numeric_flag(name, value, origin); 731 } 732 733 return false; 734 } 735 736 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 737 assert(bldarray != NULL, "illegal argument"); 738 739 if (arg == NULL) { 740 return; 741 } 742 743 int new_count = *count + 1; 744 745 // expand the array and add arg to the last element 746 if (*bldarray == NULL) { 747 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 748 } else { 749 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 750 } 751 (*bldarray)[*count] = os::strdup_check_oom(arg); 752 *count = new_count; 753 } 754 755 void Arguments::build_jvm_args(const char* arg) { 756 add_string(&_jvm_args_array, &_num_jvm_args, arg); 757 } 758 759 void Arguments::build_jvm_flags(const char* arg) { 760 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 761 } 762 763 // utility function to return a string that concatenates all 764 // strings in a given char** array 765 const char* Arguments::build_resource_string(char** args, int count) { 766 if (args == NULL || count == 0) { 767 return NULL; 768 } 769 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 770 for (int i = 1; i < count; i++) { 771 length += strlen(args[i]) + 1; // add 1 for a space 772 } 773 char* s = NEW_RESOURCE_ARRAY(char, length); 774 strcpy(s, args[0]); 775 for (int j = 1; j < count; j++) { 776 strcat(s, " "); 777 strcat(s, args[j]); 778 } 779 return (const char*) s; 780 } 781 782 void Arguments::print_on(outputStream* st) { 783 st->print_cr("VM Arguments:"); 784 if (num_jvm_flags() > 0) { 785 st->print("jvm_flags: "); print_jvm_flags_on(st); 786 } 787 if (num_jvm_args() > 0) { 788 st->print("jvm_args: "); print_jvm_args_on(st); 789 } 790 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 791 if (_java_class_path != NULL) { 792 char* path = _java_class_path->value(); 793 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 794 } 795 st->print_cr("Launcher Type: %s", _sun_java_launcher); 796 } 797 798 void Arguments::print_jvm_flags_on(outputStream* st) { 799 if (_num_jvm_flags > 0) { 800 for (int i=0; i < _num_jvm_flags; i++) { 801 st->print("%s ", _jvm_flags_array[i]); 802 } 803 st->cr(); 804 } 805 } 806 807 void Arguments::print_jvm_args_on(outputStream* st) { 808 if (_num_jvm_args > 0) { 809 for (int i=0; i < _num_jvm_args; i++) { 810 st->print("%s ", _jvm_args_array[i]); 811 } 812 st->cr(); 813 } 814 } 815 816 bool Arguments::process_argument(const char* arg, 817 jboolean ignore_unrecognized, Flag::Flags origin) { 818 819 JDK_Version since = JDK_Version(); 820 821 if (parse_argument(arg, origin) || ignore_unrecognized) { 822 return true; 823 } 824 825 // Determine if the flag has '+', '-', or '=' characters. 826 bool has_plus_minus = (*arg == '+' || *arg == '-'); 827 const char* const argname = has_plus_minus ? arg + 1 : arg; 828 829 size_t arg_len; 830 const char* equal_sign = strchr(argname, '='); 831 if (equal_sign == NULL) { 832 arg_len = strlen(argname); 833 } else { 834 arg_len = equal_sign - argname; 835 } 836 837 // Construct a string which consists only of the argument name without '+', '-', or '='. 838 char stripped_argname[256]; 839 strncpy(stripped_argname, argname, arg_len); 840 stripped_argname[arg_len] = '\0'; //strncpy doesn't null terminate. 841 842 if (is_newly_obsolete(stripped_argname, &since)) { 843 char version[256]; 844 since.to_string(version, sizeof(version)); 845 warning("ignoring option %s; support was removed in %s", stripped_argname, version); 846 return true; 847 } 848 849 // For locked flags, report a custom error message if available. 850 // Otherwise, report the standard unrecognized VM option. 851 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 852 if (found_flag != NULL) { 853 char locked_message_buf[BUFLEN]; 854 found_flag->get_locked_message(locked_message_buf, BUFLEN); 855 if (strlen(locked_message_buf) == 0) { 856 if (found_flag->is_bool() && !has_plus_minus) { 857 jio_fprintf(defaultStream::error_stream(), 858 "Missing +/- setting for VM option '%s'\n", argname); 859 } else if (!found_flag->is_bool() && has_plus_minus) { 860 jio_fprintf(defaultStream::error_stream(), 861 "Unexpected +/- setting in VM option '%s'\n", argname); 862 } else { 863 jio_fprintf(defaultStream::error_stream(), 864 "Improperly specified VM option '%s'\n", argname); 865 } 866 } else { 867 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 868 } 869 } else { 870 jio_fprintf(defaultStream::error_stream(), 871 "Unrecognized VM option '%s'\n", argname); 872 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 873 if (fuzzy_matched != NULL) { 874 jio_fprintf(defaultStream::error_stream(), 875 "Did you mean '%s%s%s'? ", 876 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 877 fuzzy_matched->_name, 878 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 879 } 880 } 881 882 // allow for commandline "commenting out" options like -XX:#+Verbose 883 return arg[0] == '#'; 884 } 885 886 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 887 FILE* stream = fopen(file_name, "rb"); 888 if (stream == NULL) { 889 if (should_exist) { 890 jio_fprintf(defaultStream::error_stream(), 891 "Could not open settings file %s\n", file_name); 892 return false; 893 } else { 894 return true; 895 } 896 } 897 898 char token[1024]; 899 int pos = 0; 900 901 bool in_white_space = true; 902 bool in_comment = false; 903 bool in_quote = false; 904 char quote_c = 0; 905 bool result = true; 906 907 int c = getc(stream); 908 while(c != EOF && pos < (int)(sizeof(token)-1)) { 909 if (in_white_space) { 910 if (in_comment) { 911 if (c == '\n') in_comment = false; 912 } else { 913 if (c == '#') in_comment = true; 914 else if (!isspace(c)) { 915 in_white_space = false; 916 token[pos++] = c; 917 } 918 } 919 } else { 920 if (c == '\n' || (!in_quote && isspace(c))) { 921 // token ends at newline, or at unquoted whitespace 922 // this allows a way to include spaces in string-valued options 923 token[pos] = '\0'; 924 logOption(token); 925 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 926 build_jvm_flags(token); 927 pos = 0; 928 in_white_space = true; 929 in_quote = false; 930 } else if (!in_quote && (c == '\'' || c == '"')) { 931 in_quote = true; 932 quote_c = c; 933 } else if (in_quote && (c == quote_c)) { 934 in_quote = false; 935 } else { 936 token[pos++] = c; 937 } 938 } 939 c = getc(stream); 940 } 941 if (pos > 0) { 942 token[pos] = '\0'; 943 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 944 build_jvm_flags(token); 945 } 946 fclose(stream); 947 return result; 948 } 949 950 //============================================================================================================= 951 // Parsing of properties (-D) 952 953 const char* Arguments::get_property(const char* key) { 954 return PropertyList_get_value(system_properties(), key); 955 } 956 957 bool Arguments::add_property(const char* prop) { 958 const char* eq = strchr(prop, '='); 959 char* key; 960 // ns must be static--its address may be stored in a SystemProperty object. 961 const static char ns[1] = {0}; 962 char* value = (char *)ns; 963 964 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 965 key = AllocateHeap(key_len + 1, mtInternal); 966 strncpy(key, prop, key_len); 967 key[key_len] = '\0'; 968 969 if (eq != NULL) { 970 size_t value_len = strlen(prop) - key_len - 1; 971 value = AllocateHeap(value_len + 1, mtInternal); 972 strncpy(value, &prop[key_len + 1], value_len + 1); 973 } 974 975 if (strcmp(key, "java.compiler") == 0) { 976 process_java_compiler_argument(value); 977 FreeHeap(key); 978 if (eq != NULL) { 979 FreeHeap(value); 980 } 981 return true; 982 } else if (strcmp(key, "sun.java.command") == 0) { 983 _java_command = value; 984 985 // Record value in Arguments, but let it get passed to Java. 986 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 987 strcmp(key, "sun.java.launcher.pid") == 0) { 988 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 989 // private and are processed in process_sun_java_launcher_properties(); 990 // the sun.java.launcher property is passed on to the java application 991 FreeHeap(key); 992 if (eq != NULL) { 993 FreeHeap(value); 994 } 995 return true; 996 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 997 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 998 // its value without going through the property list or making a Java call. 999 _java_vendor_url_bug = value; 1000 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1001 PropertyList_unique_add(&_system_properties, key, value, true); 1002 return true; 1003 } 1004 // Create new property and add at the end of the list 1005 PropertyList_unique_add(&_system_properties, key, value); 1006 return true; 1007 } 1008 1009 //=========================================================================================================== 1010 // Setting int/mixed/comp mode flags 1011 1012 void Arguments::set_mode_flags(Mode mode) { 1013 // Set up default values for all flags. 1014 // If you add a flag to any of the branches below, 1015 // add a default value for it here. 1016 set_java_compiler(false); 1017 _mode = mode; 1018 1019 // Ensure Agent_OnLoad has the correct initial values. 1020 // This may not be the final mode; mode may change later in onload phase. 1021 PropertyList_unique_add(&_system_properties, "java.vm.info", 1022 (char*)VM_Version::vm_info_string(), false); 1023 1024 UseInterpreter = true; 1025 UseCompiler = true; 1026 UseLoopCounter = true; 1027 1028 // Default values may be platform/compiler dependent - 1029 // use the saved values 1030 ClipInlining = Arguments::_ClipInlining; 1031 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1032 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1033 BackgroundCompilation = Arguments::_BackgroundCompilation; 1034 if (TieredCompilation) { 1035 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1036 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1037 } 1038 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1039 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1040 } 1041 } 1042 1043 // Change from defaults based on mode 1044 switch (mode) { 1045 default: 1046 ShouldNotReachHere(); 1047 break; 1048 case _int: 1049 UseCompiler = false; 1050 UseLoopCounter = false; 1051 AlwaysCompileLoopMethods = false; 1052 UseOnStackReplacement = false; 1053 break; 1054 case _mixed: 1055 // same as default 1056 break; 1057 case _comp: 1058 UseInterpreter = false; 1059 BackgroundCompilation = false; 1060 ClipInlining = false; 1061 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1062 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1063 // compile a level 4 (C2) and then continue executing it. 1064 if (TieredCompilation) { 1065 Tier3InvokeNotifyFreqLog = 0; 1066 Tier4InvocationThreshold = 0; 1067 } 1068 break; 1069 } 1070 } 1071 1072 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1073 // Conflict: required to use shared spaces (-Xshare:on), but 1074 // incompatible command line options were chosen. 1075 1076 static void no_shared_spaces(const char* message) { 1077 if (RequireSharedSpaces) { 1078 jio_fprintf(defaultStream::error_stream(), 1079 "Class data sharing is inconsistent with other specified options.\n"); 1080 vm_exit_during_initialization("Unable to use shared archive.", message); 1081 } else { 1082 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1083 } 1084 } 1085 #endif 1086 1087 // Returns threshold scaled with the value of scale. 1088 // If scale < 0.0, threshold is returned without scaling. 1089 intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1090 if (scale == 1.0 || scale < 0.0) { 1091 return threshold; 1092 } else { 1093 return (intx)(threshold * scale); 1094 } 1095 } 1096 1097 // Returns freq_log scaled with the value of scale. 1098 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1099 // If scale < 0.0, freq_log is returned without scaling. 1100 intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1101 // Check if scaling is necessary or if negative value was specified. 1102 if (scale == 1.0 || scale < 0.0) { 1103 return freq_log; 1104 } 1105 // Check values to avoid calculating log2 of 0. 1106 if (scale == 0.0 || freq_log == 0) { 1107 return 0; 1108 } 1109 // Determine the maximum notification frequency value currently supported. 1110 // The largest mask value that the interpreter/C1 can handle is 1111 // of length InvocationCounter::number_of_count_bits. Mask values are always 1112 // one bit shorter then the value of the notification frequency. Set 1113 // max_freq_bits accordingly. 1114 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1115 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1116 if (scaled_freq == 0) { 1117 // Return 0 right away to avoid calculating log2 of 0. 1118 return 0; 1119 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1120 return max_freq_bits; 1121 } else { 1122 return log2_intptr(scaled_freq); 1123 } 1124 } 1125 1126 void Arguments::set_tiered_flags() { 1127 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1128 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1129 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1130 } 1131 if (CompilationPolicyChoice < 2) { 1132 vm_exit_during_initialization( 1133 "Incompatible compilation policy selected", NULL); 1134 } 1135 // Increase the code cache size - tiered compiles a lot more. 1136 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1137 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1138 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1139 } 1140 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1141 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1142 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1143 1144 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1145 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap) 1146 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) { 1147 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1148 } 1149 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) { 1150 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1151 } 1152 // Check consistency of code heap sizes 1153 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 1154 jio_fprintf(defaultStream::error_stream(), 1155 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 1156 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 1157 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 1158 vm_exit(1); 1159 } 1160 } 1161 } 1162 if (!UseInterpreter) { // -Xcomp 1163 Tier3InvokeNotifyFreqLog = 0; 1164 Tier4InvocationThreshold = 0; 1165 } 1166 1167 if (CompileThresholdScaling < 0) { 1168 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1169 } 1170 1171 // Scale tiered compilation thresholds. 1172 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1173 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1174 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1175 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1176 1177 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1178 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1179 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1180 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1181 1182 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1183 // once these thresholds become supported. 1184 1185 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1186 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1187 1188 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1189 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1190 1191 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1192 1193 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1194 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1195 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1196 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1197 } 1198 } 1199 1200 /** 1201 * Returns the minimum number of compiler threads needed to run the JVM. The following 1202 * configurations are possible. 1203 * 1204 * 1) The JVM is build using an interpreter only. As a result, the minimum number of 1205 * compiler threads is 0. 1206 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As 1207 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1. 1208 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However, 1209 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only 1210 * C1 can be used, so the minimum number of compiler threads is 1. 1211 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option 1212 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result, 1213 * the minimum number of compiler threads is 2. 1214 */ 1215 int Arguments::get_min_number_of_compiler_threads() { 1216 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 1217 return 0; // case 1 1218 #else 1219 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) { 1220 return 1; // case 2 or case 3 1221 } 1222 return 2; // case 4 (tiered) 1223 #endif 1224 } 1225 1226 #if INCLUDE_ALL_GCS 1227 static void disable_adaptive_size_policy(const char* collector_name) { 1228 if (UseAdaptiveSizePolicy) { 1229 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1230 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1231 collector_name); 1232 } 1233 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1234 } 1235 } 1236 1237 void Arguments::set_parnew_gc_flags() { 1238 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1239 "control point invariant"); 1240 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1241 assert(UseParNewGC, "ParNew should always be used with CMS"); 1242 1243 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1244 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1245 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1246 } else if (ParallelGCThreads == 0) { 1247 jio_fprintf(defaultStream::error_stream(), 1248 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1249 vm_exit(1); 1250 } 1251 1252 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1253 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1254 // we set them to 1024 and 1024. 1255 // See CR 6362902. 1256 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1257 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1258 } 1259 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1260 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1261 } 1262 1263 // When using compressed oops, we use local overflow stacks, 1264 // rather than using a global overflow list chained through 1265 // the klass word of the object's pre-image. 1266 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1267 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1268 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1269 } 1270 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1271 } 1272 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1273 } 1274 1275 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1276 // sparc/solaris for certain applications, but would gain from 1277 // further optimization and tuning efforts, and would almost 1278 // certainly gain from analysis of platform and environment. 1279 void Arguments::set_cms_and_parnew_gc_flags() { 1280 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1281 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1282 assert(UseParNewGC, "ParNew should always be used with CMS"); 1283 1284 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1285 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1286 1287 set_parnew_gc_flags(); 1288 1289 size_t max_heap = align_size_down(MaxHeapSize, 1290 CardTableRS::ct_max_alignment_constraint()); 1291 1292 // Now make adjustments for CMS 1293 intx tenuring_default = (intx)6; 1294 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1295 1296 // Preferred young gen size for "short" pauses: 1297 // upper bound depends on # of threads and NewRatio. 1298 const size_t preferred_max_new_size_unaligned = 1299 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads)); 1300 size_t preferred_max_new_size = 1301 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1302 1303 // Unless explicitly requested otherwise, size young gen 1304 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1305 1306 // If either MaxNewSize or NewRatio is set on the command line, 1307 // assume the user is trying to set the size of the young gen. 1308 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1309 1310 // Set MaxNewSize to our calculated preferred_max_new_size unless 1311 // NewSize was set on the command line and it is larger than 1312 // preferred_max_new_size. 1313 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1314 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1315 } else { 1316 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size); 1317 } 1318 if (PrintGCDetails && Verbose) { 1319 // Too early to use gclog_or_tty 1320 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1321 } 1322 1323 // Code along this path potentially sets NewSize and OldSize 1324 if (PrintGCDetails && Verbose) { 1325 // Too early to use gclog_or_tty 1326 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1327 " initial_heap_size: " SIZE_FORMAT 1328 " max_heap: " SIZE_FORMAT, 1329 min_heap_size(), InitialHeapSize, max_heap); 1330 } 1331 size_t min_new = preferred_max_new_size; 1332 if (FLAG_IS_CMDLINE(NewSize)) { 1333 min_new = NewSize; 1334 } 1335 if (max_heap > min_new && min_heap_size() > min_new) { 1336 // Unless explicitly requested otherwise, make young gen 1337 // at least min_new, and at most preferred_max_new_size. 1338 if (FLAG_IS_DEFAULT(NewSize)) { 1339 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new)); 1340 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize)); 1341 if (PrintGCDetails && Verbose) { 1342 // Too early to use gclog_or_tty 1343 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1344 } 1345 } 1346 // Unless explicitly requested otherwise, size old gen 1347 // so it's NewRatio x of NewSize. 1348 if (FLAG_IS_DEFAULT(OldSize)) { 1349 if (max_heap > NewSize) { 1350 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1351 if (PrintGCDetails && Verbose) { 1352 // Too early to use gclog_or_tty 1353 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1354 } 1355 } 1356 } 1357 } 1358 } 1359 // Unless explicitly requested otherwise, definitely 1360 // promote all objects surviving "tenuring_default" scavenges. 1361 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1362 FLAG_IS_DEFAULT(SurvivorRatio)) { 1363 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1364 } 1365 // If we decided above (or user explicitly requested) 1366 // `promote all' (via MaxTenuringThreshold := 0), 1367 // prefer minuscule survivor spaces so as not to waste 1368 // space for (non-existent) survivors 1369 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1370 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1371 } 1372 1373 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1374 // but rather the number of free blocks of a given size that are used when 1375 // replenishing the local per-worker free list caches. 1376 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1377 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1378 // OldPLAB sizing manually turned off: Use a larger default setting, 1379 // unless it was manually specified. This is because a too-low value 1380 // will slow down scavenges. 1381 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166 1382 } else { 1383 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1384 } 1385 } 1386 1387 // If either of the static initialization defaults have changed, note this 1388 // modification. 1389 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1390 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1391 } 1392 if (PrintGCDetails && Verbose) { 1393 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1394 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1395 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1396 } 1397 } 1398 #endif // INCLUDE_ALL_GCS 1399 1400 void set_object_alignment() { 1401 // Object alignment. 1402 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1403 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1404 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1405 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1406 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1407 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1408 1409 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1410 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1411 1412 // Oop encoding heap max 1413 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1414 1415 if (SurvivorAlignmentInBytes == 0) { 1416 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1417 } 1418 1419 #if INCLUDE_ALL_GCS 1420 // Set CMS global values 1421 CompactibleFreeListSpace::set_cms_values(); 1422 #endif // INCLUDE_ALL_GCS 1423 } 1424 1425 size_t Arguments::max_heap_for_compressed_oops() { 1426 // Avoid sign flip. 1427 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1428 // We need to fit both the NULL page and the heap into the memory budget, while 1429 // keeping alignment constraints of the heap. To guarantee the latter, as the 1430 // NULL page is located before the heap, we pad the NULL page to the conservative 1431 // maximum alignment that the GC may ever impose upon the heap. 1432 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1433 _conservative_max_heap_alignment); 1434 1435 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1436 NOT_LP64(ShouldNotReachHere(); return 0); 1437 } 1438 1439 bool Arguments::should_auto_select_low_pause_collector() { 1440 if (UseAutoGCSelectPolicy && 1441 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1442 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1443 if (PrintGCDetails) { 1444 // Cannot use gclog_or_tty yet. 1445 tty->print_cr("Automatic selection of the low pause collector" 1446 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1447 } 1448 return true; 1449 } 1450 return false; 1451 } 1452 1453 void Arguments::set_use_compressed_oops() { 1454 #ifndef ZERO 1455 #ifdef _LP64 1456 // MaxHeapSize is not set up properly at this point, but 1457 // the only value that can override MaxHeapSize if we are 1458 // to use UseCompressedOops is InitialHeapSize. 1459 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1460 1461 if (max_heap_size <= max_heap_for_compressed_oops()) { 1462 #if !defined(COMPILER1) || defined(TIERED) 1463 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1464 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1465 } 1466 #endif 1467 } else { 1468 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1469 warning("Max heap size too large for Compressed Oops"); 1470 FLAG_SET_DEFAULT(UseCompressedOops, false); 1471 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1472 } 1473 } 1474 #endif // _LP64 1475 #endif // ZERO 1476 } 1477 1478 1479 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1480 // set_use_compressed_oops(). 1481 void Arguments::set_use_compressed_klass_ptrs() { 1482 #ifndef ZERO 1483 #ifdef _LP64 1484 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1485 if (!UseCompressedOops) { 1486 if (UseCompressedClassPointers) { 1487 warning("UseCompressedClassPointers requires UseCompressedOops"); 1488 } 1489 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1490 } else { 1491 // Turn on UseCompressedClassPointers too 1492 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1493 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1494 } 1495 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1496 if (UseCompressedClassPointers) { 1497 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1498 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1499 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1500 } 1501 } 1502 } 1503 #endif // _LP64 1504 #endif // !ZERO 1505 } 1506 1507 void Arguments::set_conservative_max_heap_alignment() { 1508 // The conservative maximum required alignment for the heap is the maximum of 1509 // the alignments imposed by several sources: any requirements from the heap 1510 // itself, the collector policy and the maximum page size we may run the VM 1511 // with. 1512 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1513 #if INCLUDE_ALL_GCS 1514 if (UseParallelGC) { 1515 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1516 } else if (UseG1GC) { 1517 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1518 } 1519 #endif // INCLUDE_ALL_GCS 1520 _conservative_max_heap_alignment = MAX4(heap_alignment, 1521 (size_t)os::vm_allocation_granularity(), 1522 os::max_page_size(), 1523 CollectorPolicy::compute_heap_alignment()); 1524 } 1525 1526 void Arguments::select_gc_ergonomically() { 1527 if (os::is_server_class_machine()) { 1528 if (should_auto_select_low_pause_collector()) { 1529 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1530 } else { 1531 FLAG_SET_ERGO(bool, UseParallelGC, true); 1532 } 1533 } else { 1534 FLAG_SET_ERGO(bool, UseSerialGC, true); 1535 } 1536 } 1537 1538 void Arguments::select_gc() { 1539 if (!gc_selected()) { 1540 select_gc_ergonomically(); 1541 guarantee(gc_selected(), "No GC selected"); 1542 } 1543 } 1544 1545 void Arguments::set_ergonomics_flags() { 1546 select_gc(); 1547 1548 #ifdef COMPILER2 1549 // Shared spaces work fine with other GCs but causes bytecode rewriting 1550 // to be disabled, which hurts interpreter performance and decreases 1551 // server performance. When -server is specified, keep the default off 1552 // unless it is asked for. Future work: either add bytecode rewriting 1553 // at link time, or rewrite bytecodes in non-shared methods. 1554 if (!DumpSharedSpaces && !RequireSharedSpaces && 1555 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1556 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1557 } 1558 #endif 1559 1560 set_conservative_max_heap_alignment(); 1561 1562 #ifndef ZERO 1563 #ifdef _LP64 1564 set_use_compressed_oops(); 1565 1566 // set_use_compressed_klass_ptrs() must be called after calling 1567 // set_use_compressed_oops(). 1568 set_use_compressed_klass_ptrs(); 1569 1570 // Also checks that certain machines are slower with compressed oops 1571 // in vm_version initialization code. 1572 #endif // _LP64 1573 #endif // !ZERO 1574 } 1575 1576 void Arguments::set_parallel_gc_flags() { 1577 assert(UseParallelGC || UseParallelOldGC, "Error"); 1578 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1579 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1580 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1581 } 1582 FLAG_SET_DEFAULT(UseParallelGC, true); 1583 1584 // If no heap maximum was requested explicitly, use some reasonable fraction 1585 // of the physical memory, up to a maximum of 1GB. 1586 FLAG_SET_DEFAULT(ParallelGCThreads, 1587 Abstract_VM_Version::parallel_worker_threads()); 1588 if (ParallelGCThreads == 0) { 1589 jio_fprintf(defaultStream::error_stream(), 1590 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1591 vm_exit(1); 1592 } 1593 1594 if (UseAdaptiveSizePolicy) { 1595 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1596 // unless the user actually sets these flags. 1597 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1598 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1599 _min_heap_free_ratio = MinHeapFreeRatio; 1600 } 1601 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1602 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1603 _max_heap_free_ratio = MaxHeapFreeRatio; 1604 } 1605 } 1606 1607 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1608 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1609 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1610 // See CR 6362902 for details. 1611 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1612 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1613 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1614 } 1615 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1616 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1617 } 1618 } 1619 1620 if (UseParallelOldGC) { 1621 // Par compact uses lower default values since they are treated as 1622 // minimums. These are different defaults because of the different 1623 // interpretation and are not ergonomically set. 1624 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1625 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1626 } 1627 } 1628 } 1629 1630 void Arguments::set_g1_gc_flags() { 1631 assert(UseG1GC, "Error"); 1632 #ifdef COMPILER1 1633 FastTLABRefill = false; 1634 #endif 1635 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1636 if (ParallelGCThreads == 0) { 1637 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1638 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1639 } 1640 1641 #if INCLUDE_ALL_GCS 1642 if (G1ConcRefinementThreads == 0) { 1643 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads); 1644 } 1645 #endif 1646 1647 // MarkStackSize will be set (if it hasn't been set by the user) 1648 // when concurrent marking is initialized. 1649 // Its value will be based upon the number of parallel marking threads. 1650 // But we do set the maximum mark stack size here. 1651 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1652 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1653 } 1654 1655 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1656 // In G1, we want the default GC overhead goal to be higher than 1657 // say in PS. So we set it here to 10%. Otherwise the heap might 1658 // be expanded more aggressively than we would like it to. In 1659 // fact, even 10% seems to not be high enough in some cases 1660 // (especially small GC stress tests that the main thing they do 1661 // is allocation). We might consider increase it further. 1662 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1663 } 1664 1665 if (PrintGCDetails && Verbose) { 1666 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1667 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1668 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1669 } 1670 } 1671 1672 #if !INCLUDE_ALL_GCS 1673 #ifdef ASSERT 1674 static bool verify_serial_gc_flags() { 1675 return (UseSerialGC && 1676 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC || 1677 UseParallelGC || UseParallelOldGC)); 1678 } 1679 #endif // ASSERT 1680 #endif // INCLUDE_ALL_GCS 1681 1682 void Arguments::set_gc_specific_flags() { 1683 #if INCLUDE_ALL_GCS 1684 // Set per-collector flags 1685 if (UseParallelGC || UseParallelOldGC) { 1686 set_parallel_gc_flags(); 1687 } else if (UseConcMarkSweepGC) { 1688 set_cms_and_parnew_gc_flags(); 1689 } else if (UseG1GC) { 1690 set_g1_gc_flags(); 1691 } 1692 check_deprecated_gc_flags(); 1693 if (AssumeMP && !UseSerialGC) { 1694 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 1695 warning("If the number of processors is expected to increase from one, then" 1696 " you should configure the number of parallel GC threads appropriately" 1697 " using -XX:ParallelGCThreads=N"); 1698 } 1699 } 1700 if (MinHeapFreeRatio == 100) { 1701 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1702 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 1703 } 1704 #else // INCLUDE_ALL_GCS 1705 assert(verify_serial_gc_flags(), "SerialGC unset"); 1706 #endif // INCLUDE_ALL_GCS 1707 } 1708 1709 julong Arguments::limit_by_allocatable_memory(julong limit) { 1710 julong max_allocatable; 1711 julong result = limit; 1712 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1713 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1714 } 1715 return result; 1716 } 1717 1718 // Use static initialization to get the default before parsing 1719 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1720 1721 void Arguments::set_heap_size() { 1722 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1723 // Deprecated flag 1724 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1725 } 1726 1727 const julong phys_mem = 1728 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1729 : (julong)MaxRAM; 1730 1731 // If the maximum heap size has not been set with -Xmx, 1732 // then set it as fraction of the size of physical memory, 1733 // respecting the maximum and minimum sizes of the heap. 1734 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1735 julong reasonable_max = phys_mem / MaxRAMFraction; 1736 1737 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1738 // Small physical memory, so use a minimum fraction of it for the heap 1739 reasonable_max = phys_mem / MinRAMFraction; 1740 } else { 1741 // Not-small physical memory, so require a heap at least 1742 // as large as MaxHeapSize 1743 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1744 } 1745 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1746 // Limit the heap size to ErgoHeapSizeLimit 1747 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1748 } 1749 if (UseCompressedOops) { 1750 // Limit the heap size to the maximum possible when using compressed oops 1751 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1752 1753 // HeapBaseMinAddress can be greater than default but not less than. 1754 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1755 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1756 // matches compressed oops printing flags 1757 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 1758 jio_fprintf(defaultStream::error_stream(), 1759 "HeapBaseMinAddress must be at least " SIZE_FORMAT 1760 " (" SIZE_FORMAT "G) which is greater than value given " 1761 SIZE_FORMAT "\n", 1762 DefaultHeapBaseMinAddress, 1763 DefaultHeapBaseMinAddress/G, 1764 HeapBaseMinAddress); 1765 } 1766 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1767 } 1768 } 1769 1770 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1771 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1772 // but it should be not less than default MaxHeapSize. 1773 max_coop_heap -= HeapBaseMinAddress; 1774 } 1775 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1776 } 1777 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1778 1779 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1780 // An initial heap size was specified on the command line, 1781 // so be sure that the maximum size is consistent. Done 1782 // after call to limit_by_allocatable_memory because that 1783 // method might reduce the allocation size. 1784 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1785 } 1786 1787 if (PrintGCDetails && Verbose) { 1788 // Cannot use gclog_or_tty yet. 1789 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1790 } 1791 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 1792 } 1793 1794 // If the minimum or initial heap_size have not been set or requested to be set 1795 // ergonomically, set them accordingly. 1796 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1797 julong reasonable_minimum = (julong)(OldSize + NewSize); 1798 1799 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1800 1801 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1802 1803 if (InitialHeapSize == 0) { 1804 julong reasonable_initial = phys_mem / InitialRAMFraction; 1805 1806 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1807 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1808 1809 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1810 1811 if (PrintGCDetails && Verbose) { 1812 // Cannot use gclog_or_tty yet. 1813 tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 1814 } 1815 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 1816 } 1817 // If the minimum heap size has not been set (via -Xms), 1818 // synchronize with InitialHeapSize to avoid errors with the default value. 1819 if (min_heap_size() == 0) { 1820 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1821 if (PrintGCDetails && Verbose) { 1822 // Cannot use gclog_or_tty yet. 1823 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1824 } 1825 } 1826 } 1827 } 1828 1829 // This must be called after ergonomics. 1830 void Arguments::set_bytecode_flags() { 1831 if (!RewriteBytecodes) { 1832 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1833 } 1834 } 1835 1836 // Aggressive optimization flags -XX:+AggressiveOpts 1837 void Arguments::set_aggressive_opts_flags() { 1838 #ifdef COMPILER2 1839 if (AggressiveUnboxing) { 1840 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1841 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1842 } else if (!EliminateAutoBox) { 1843 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1844 AggressiveUnboxing = false; 1845 } 1846 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1847 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1848 } else if (!DoEscapeAnalysis) { 1849 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1850 AggressiveUnboxing = false; 1851 } 1852 } 1853 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1854 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1855 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1856 } 1857 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1858 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1859 } 1860 1861 // Feed the cache size setting into the JDK 1862 char buffer[1024]; 1863 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1864 add_property(buffer); 1865 } 1866 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1867 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1868 } 1869 #endif 1870 1871 if (AggressiveOpts) { 1872 // Sample flag setting code 1873 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1874 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1875 // } 1876 } 1877 } 1878 1879 //=========================================================================================================== 1880 // Parsing of java.compiler property 1881 1882 void Arguments::process_java_compiler_argument(char* arg) { 1883 // For backwards compatibility, Djava.compiler=NONE or "" 1884 // causes us to switch to -Xint mode UNLESS -Xdebug 1885 // is also specified. 1886 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1887 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1888 } 1889 } 1890 1891 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1892 _sun_java_launcher = os::strdup_check_oom(launcher); 1893 } 1894 1895 bool Arguments::created_by_java_launcher() { 1896 assert(_sun_java_launcher != NULL, "property must have value"); 1897 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1898 } 1899 1900 bool Arguments::sun_java_launcher_is_altjvm() { 1901 return _sun_java_launcher_is_altjvm; 1902 } 1903 1904 //=========================================================================================================== 1905 // Parsing of main arguments 1906 1907 // check if do gclog rotation 1908 // +UseGCLogFileRotation is a must, 1909 // no gc log rotation when log file not supplied or 1910 // NumberOfGCLogFiles is 0 1911 void check_gclog_consistency() { 1912 if (UseGCLogFileRotation) { 1913 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { 1914 jio_fprintf(defaultStream::output_stream(), 1915 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" 1916 "where num_of_file > 0\n" 1917 "GC log rotation is turned off\n"); 1918 UseGCLogFileRotation = false; 1919 } 1920 } 1921 1922 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { 1923 if (FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K) == Flag::SUCCESS) { 1924 jio_fprintf(defaultStream::output_stream(), 1925 "GCLogFileSize changed to minimum 8K\n"); 1926 } 1927 } 1928 } 1929 1930 // This function is called for -Xloggc:<filename>, it can be used 1931 // to check if a given file name(or string) conforms to the following 1932 // specification: 1933 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 1934 // %p and %t only allowed once. We only limit usage of filename not path 1935 bool is_filename_valid(const char *file_name) { 1936 const char* p = file_name; 1937 char file_sep = os::file_separator()[0]; 1938 const char* cp; 1939 // skip prefix path 1940 for (cp = file_name; *cp != '\0'; cp++) { 1941 if (*cp == '/' || *cp == file_sep) { 1942 p = cp + 1; 1943 } 1944 } 1945 1946 int count_p = 0; 1947 int count_t = 0; 1948 while (*p != '\0') { 1949 if ((*p >= '0' && *p <= '9') || 1950 (*p >= 'A' && *p <= 'Z') || 1951 (*p >= 'a' && *p <= 'z') || 1952 *p == '-' || 1953 *p == '_' || 1954 *p == '.') { 1955 p++; 1956 continue; 1957 } 1958 if (*p == '%') { 1959 if(*(p + 1) == 'p') { 1960 p += 2; 1961 count_p ++; 1962 continue; 1963 } 1964 if (*(p + 1) == 't') { 1965 p += 2; 1966 count_t ++; 1967 continue; 1968 } 1969 } 1970 return false; 1971 } 1972 return count_p < 2 && count_t < 2; 1973 } 1974 1975 // Check consistency of GC selection 1976 bool Arguments::check_gc_consistency() { 1977 check_gclog_consistency(); 1978 // Ensure that the user has not selected conflicting sets 1979 // of collectors. 1980 uint i = 0; 1981 if (UseSerialGC) i++; 1982 if (UseConcMarkSweepGC) i++; 1983 if (UseParallelGC || UseParallelOldGC) i++; 1984 if (UseG1GC) i++; 1985 if (i > 1) { 1986 jio_fprintf(defaultStream::error_stream(), 1987 "Conflicting collector combinations in option list; " 1988 "please refer to the release notes for the combinations " 1989 "allowed\n"); 1990 return false; 1991 } 1992 1993 if (UseConcMarkSweepGC && !UseParNewGC) { 1994 jio_fprintf(defaultStream::error_stream(), 1995 "It is not possible to combine the DefNew young collector with the CMS collector.\n"); 1996 return false; 1997 } 1998 1999 if (UseParNewGC && !UseConcMarkSweepGC) { 2000 jio_fprintf(defaultStream::error_stream(), 2001 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n"); 2002 return false; 2003 } 2004 2005 return true; 2006 } 2007 2008 void Arguments::check_deprecated_gc_flags() { 2009 if (FLAG_IS_CMDLINE(UseParNewGC)) { 2010 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release"); 2011 } 2012 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 2013 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 2014 "and will likely be removed in future release"); 2015 } 2016 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 2017 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 2018 "Use MaxRAMFraction instead."); 2019 } 2020 } 2021 2022 // Check the consistency of vm_init_args 2023 bool Arguments::check_vm_args_consistency() { 2024 // Method for adding checks for flag consistency. 2025 // The intent is to warn the user of all possible conflicts, 2026 // before returning an error. 2027 // Note: Needs platform-dependent factoring. 2028 bool status = true; 2029 2030 if (TLABRefillWasteFraction == 0) { 2031 jio_fprintf(defaultStream::error_stream(), 2032 "TLABRefillWasteFraction should be a denominator, " 2033 "not " SIZE_FORMAT "\n", 2034 TLABRefillWasteFraction); 2035 status = false; 2036 } 2037 2038 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2039 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2040 } 2041 2042 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2043 // Settings to encourage splitting. 2044 if (!FLAG_IS_CMDLINE(NewRatio)) { 2045 if (FLAG_SET_CMDLINE(uintx, NewRatio, 2) != Flag::SUCCESS) { 2046 status = false; 2047 } 2048 } 2049 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2050 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 2051 status = false; 2052 } 2053 } 2054 } 2055 2056 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2057 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2058 } 2059 2060 if (GCTimeLimit == 100) { 2061 // Turn off gc-overhead-limit-exceeded checks 2062 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2063 } 2064 2065 status = status && check_gc_consistency(); 2066 2067 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2068 // insists that we hold the requisite locks so that the iteration is 2069 // MT-safe. For the verification at start-up and shut-down, we don't 2070 // yet have a good way of acquiring and releasing these locks, 2071 // which are not visible at the CollectedHeap level. We want to 2072 // be able to acquire these locks and then do the iteration rather 2073 // than just disable the lock verification. This will be fixed under 2074 // bug 4788986. 2075 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2076 if (VerifyDuringStartup) { 2077 warning("Heap verification at start-up disabled " 2078 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2079 VerifyDuringStartup = false; // Disable verification at start-up 2080 } 2081 2082 if (VerifyBeforeExit) { 2083 warning("Heap verification at shutdown disabled " 2084 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2085 VerifyBeforeExit = false; // Disable verification at shutdown 2086 } 2087 } 2088 2089 // Note: only executed in non-PRODUCT mode 2090 if (!UseAsyncConcMarkSweepGC && 2091 (ExplicitGCInvokesConcurrent || 2092 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2093 jio_fprintf(defaultStream::error_stream(), 2094 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2095 " with -UseAsyncConcMarkSweepGC"); 2096 status = false; 2097 } 2098 2099 if (PrintNMTStatistics) { 2100 #if INCLUDE_NMT 2101 if (MemTracker::tracking_level() == NMT_off) { 2102 #endif // INCLUDE_NMT 2103 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2104 PrintNMTStatistics = false; 2105 #if INCLUDE_NMT 2106 } 2107 #endif 2108 } 2109 2110 // Check lower bounds of the code cache 2111 // Template Interpreter code is approximately 3X larger in debug builds. 2112 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2113 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2114 jio_fprintf(defaultStream::error_stream(), 2115 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2116 os::vm_page_size()/K); 2117 status = false; 2118 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2119 jio_fprintf(defaultStream::error_stream(), 2120 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2121 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2122 status = false; 2123 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2124 jio_fprintf(defaultStream::error_stream(), 2125 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2126 min_code_cache_size/K); 2127 status = false; 2128 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2129 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2130 jio_fprintf(defaultStream::error_stream(), 2131 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2132 CODE_CACHE_SIZE_LIMIT/M); 2133 status = false; 2134 } else if (NonNMethodCodeHeapSize < min_code_cache_size){ 2135 jio_fprintf(defaultStream::error_stream(), 2136 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2137 min_code_cache_size/K); 2138 status = false; 2139 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) 2140 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 2141 jio_fprintf(defaultStream::error_stream(), 2142 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 2143 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 2144 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 2145 status = false; 2146 } 2147 2148 int min_number_of_compiler_threads = get_min_number_of_compiler_threads(); 2149 // The default CICompilerCount's value is CI_COMPILER_COUNT. 2150 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number"); 2151 2152 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2153 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2154 } 2155 2156 return status; 2157 } 2158 2159 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2160 const char* option_type) { 2161 if (ignore) return false; 2162 2163 const char* spacer = " "; 2164 if (option_type == NULL) { 2165 option_type = ++spacer; // Set both to the empty string. 2166 } 2167 2168 if (os::obsolete_option(option)) { 2169 jio_fprintf(defaultStream::error_stream(), 2170 "Obsolete %s%soption: %s\n", option_type, spacer, 2171 option->optionString); 2172 return false; 2173 } else { 2174 jio_fprintf(defaultStream::error_stream(), 2175 "Unrecognized %s%soption: %s\n", option_type, spacer, 2176 option->optionString); 2177 return true; 2178 } 2179 } 2180 2181 static const char* user_assertion_options[] = { 2182 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2183 }; 2184 2185 static const char* system_assertion_options[] = { 2186 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2187 }; 2188 2189 bool Arguments::parse_uintx(const char* value, 2190 uintx* uintx_arg, 2191 uintx min_size) { 2192 2193 // Check the sign first since atomull() parses only unsigned values. 2194 bool value_is_positive = !(*value == '-'); 2195 2196 if (value_is_positive) { 2197 julong n; 2198 bool good_return = atomull(value, &n); 2199 if (good_return) { 2200 bool above_minimum = n >= min_size; 2201 bool value_is_too_large = n > max_uintx; 2202 2203 if (above_minimum && !value_is_too_large) { 2204 *uintx_arg = n; 2205 return true; 2206 } 2207 } 2208 } 2209 return false; 2210 } 2211 2212 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2213 julong* long_arg, 2214 julong min_size) { 2215 if (!atomull(s, long_arg)) return arg_unreadable; 2216 return check_memory_size(*long_arg, min_size); 2217 } 2218 2219 // Parse JavaVMInitArgs structure 2220 2221 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2222 // For components of the system classpath. 2223 SysClassPath scp(Arguments::get_sysclasspath()); 2224 bool scp_assembly_required = false; 2225 2226 // Save default settings for some mode flags 2227 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2228 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2229 Arguments::_ClipInlining = ClipInlining; 2230 Arguments::_BackgroundCompilation = BackgroundCompilation; 2231 if (TieredCompilation) { 2232 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2233 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2234 } 2235 2236 // Setup flags for mixed which is the default 2237 set_mode_flags(_mixed); 2238 2239 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2240 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2241 if (result != JNI_OK) { 2242 return result; 2243 } 2244 2245 // Parse JavaVMInitArgs structure passed in 2246 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE); 2247 if (result != JNI_OK) { 2248 return result; 2249 } 2250 2251 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2252 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2253 if (result != JNI_OK) { 2254 return result; 2255 } 2256 2257 // Do final processing now that all arguments have been parsed 2258 result = finalize_vm_init_args(&scp, scp_assembly_required); 2259 if (result != JNI_OK) { 2260 return result; 2261 } 2262 2263 return JNI_OK; 2264 } 2265 2266 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2267 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2268 // are dealing with -agentpath (case where name is a path), otherwise with 2269 // -agentlib 2270 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2271 char *_name; 2272 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2273 size_t _len_hprof, _len_jdwp, _len_prefix; 2274 2275 if (is_path) { 2276 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2277 return false; 2278 } 2279 2280 _name++; // skip past last path separator 2281 _len_prefix = strlen(JNI_LIB_PREFIX); 2282 2283 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2284 return false; 2285 } 2286 2287 _name += _len_prefix; 2288 _len_hprof = strlen(_hprof); 2289 _len_jdwp = strlen(_jdwp); 2290 2291 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2292 _name += _len_hprof; 2293 } 2294 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2295 _name += _len_jdwp; 2296 } 2297 else { 2298 return false; 2299 } 2300 2301 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2302 return false; 2303 } 2304 2305 return true; 2306 } 2307 2308 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2309 return true; 2310 } 2311 2312 return false; 2313 } 2314 2315 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2316 SysClassPath* scp_p, 2317 bool* scp_assembly_required_p, 2318 Flag::Flags origin) { 2319 // Remaining part of option string 2320 const char* tail; 2321 2322 // iterate over arguments 2323 for (int index = 0; index < args->nOptions; index++) { 2324 bool is_absolute_path = false; // for -agentpath vs -agentlib 2325 2326 const JavaVMOption* option = args->options + index; 2327 2328 if (!match_option(option, "-Djava.class.path", &tail) && 2329 !match_option(option, "-Dsun.java.command", &tail) && 2330 !match_option(option, "-Dsun.java.launcher", &tail)) { 2331 2332 // add all jvm options to the jvm_args string. This string 2333 // is used later to set the java.vm.args PerfData string constant. 2334 // the -Djava.class.path and the -Dsun.java.command options are 2335 // omitted from jvm_args string as each have their own PerfData 2336 // string constant object. 2337 build_jvm_args(option->optionString); 2338 } 2339 2340 // -verbose:[class/gc/jni] 2341 if (match_option(option, "-verbose", &tail)) { 2342 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2343 if (FLAG_SET_CMDLINE(bool, TraceClassLoading, true) != Flag::SUCCESS) { 2344 return JNI_EINVAL; 2345 } 2346 if (FLAG_SET_CMDLINE(bool, TraceClassUnloading, true) != Flag::SUCCESS) { 2347 return JNI_EINVAL; 2348 } 2349 } else if (!strcmp(tail, ":gc")) { 2350 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) { 2351 return JNI_EINVAL; 2352 } 2353 } else if (!strcmp(tail, ":jni")) { 2354 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) { 2355 return JNI_EINVAL; 2356 } 2357 } 2358 // -da / -ea / -disableassertions / -enableassertions 2359 // These accept an optional class/package name separated by a colon, e.g., 2360 // -da:java.lang.Thread. 2361 } else if (match_option(option, user_assertion_options, &tail, true)) { 2362 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2363 if (*tail == '\0') { 2364 JavaAssertions::setUserClassDefault(enable); 2365 } else { 2366 assert(*tail == ':', "bogus match by match_option()"); 2367 JavaAssertions::addOption(tail + 1, enable); 2368 } 2369 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2370 } else if (match_option(option, system_assertion_options, &tail, false)) { 2371 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2372 JavaAssertions::setSystemClassDefault(enable); 2373 // -bootclasspath: 2374 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2375 scp_p->reset_path(tail); 2376 *scp_assembly_required_p = true; 2377 // -bootclasspath/a: 2378 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2379 scp_p->add_suffix(tail); 2380 *scp_assembly_required_p = true; 2381 // -bootclasspath/p: 2382 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2383 scp_p->add_prefix(tail); 2384 *scp_assembly_required_p = true; 2385 // -Xrun 2386 } else if (match_option(option, "-Xrun", &tail)) { 2387 if (tail != NULL) { 2388 const char* pos = strchr(tail, ':'); 2389 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2390 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2391 name[len] = '\0'; 2392 2393 char *options = NULL; 2394 if(pos != NULL) { 2395 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2396 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2397 } 2398 #if !INCLUDE_JVMTI 2399 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2400 jio_fprintf(defaultStream::error_stream(), 2401 "Profiling and debugging agents are not supported in this VM\n"); 2402 return JNI_ERR; 2403 } 2404 #endif // !INCLUDE_JVMTI 2405 add_init_library(name, options); 2406 } 2407 // -agentlib and -agentpath 2408 } else if (match_option(option, "-agentlib:", &tail) || 2409 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2410 if(tail != NULL) { 2411 const char* pos = strchr(tail, '='); 2412 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2413 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2414 name[len] = '\0'; 2415 2416 char *options = NULL; 2417 if(pos != NULL) { 2418 options = os::strdup_check_oom(pos + 1, mtInternal); 2419 } 2420 #if !INCLUDE_JVMTI 2421 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2422 jio_fprintf(defaultStream::error_stream(), 2423 "Profiling and debugging agents are not supported in this VM\n"); 2424 return JNI_ERR; 2425 } 2426 #endif // !INCLUDE_JVMTI 2427 add_init_agent(name, options, is_absolute_path); 2428 } 2429 // -javaagent 2430 } else if (match_option(option, "-javaagent:", &tail)) { 2431 #if !INCLUDE_JVMTI 2432 jio_fprintf(defaultStream::error_stream(), 2433 "Instrumentation agents are not supported in this VM\n"); 2434 return JNI_ERR; 2435 #else 2436 if(tail != NULL) { 2437 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2438 add_init_agent("instrument", options, false); 2439 } 2440 #endif // !INCLUDE_JVMTI 2441 // -Xnoclassgc 2442 } else if (match_option(option, "-Xnoclassgc")) { 2443 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) { 2444 return JNI_EINVAL; 2445 } 2446 // -Xconcgc 2447 } else if (match_option(option, "-Xconcgc")) { 2448 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) { 2449 return JNI_EINVAL; 2450 } 2451 // -Xnoconcgc 2452 } else if (match_option(option, "-Xnoconcgc")) { 2453 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) { 2454 return JNI_EINVAL; 2455 } 2456 // -Xbatch 2457 } else if (match_option(option, "-Xbatch")) { 2458 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 2459 return JNI_EINVAL; 2460 } 2461 // -Xmn for compatibility with other JVM vendors 2462 } else if (match_option(option, "-Xmn", &tail)) { 2463 julong long_initial_young_size = 0; 2464 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2465 if (errcode != arg_in_range) { 2466 jio_fprintf(defaultStream::error_stream(), 2467 "Invalid initial young generation size: %s\n", option->optionString); 2468 describe_range_error(errcode); 2469 return JNI_EINVAL; 2470 } 2471 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2472 return JNI_EINVAL; 2473 } 2474 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2475 return JNI_EINVAL; 2476 } 2477 // -Xms 2478 } else if (match_option(option, "-Xms", &tail)) { 2479 julong long_initial_heap_size = 0; 2480 // an initial heap size of 0 means automatically determine 2481 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2482 if (errcode != arg_in_range) { 2483 jio_fprintf(defaultStream::error_stream(), 2484 "Invalid initial heap size: %s\n", option->optionString); 2485 describe_range_error(errcode); 2486 return JNI_EINVAL; 2487 } 2488 set_min_heap_size((size_t)long_initial_heap_size); 2489 // Currently the minimum size and the initial heap sizes are the same. 2490 // Can be overridden with -XX:InitialHeapSize. 2491 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) { 2492 return JNI_EINVAL; 2493 } 2494 // -Xmx 2495 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2496 julong long_max_heap_size = 0; 2497 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2498 if (errcode != arg_in_range) { 2499 jio_fprintf(defaultStream::error_stream(), 2500 "Invalid maximum heap size: %s\n", option->optionString); 2501 describe_range_error(errcode); 2502 return JNI_EINVAL; 2503 } 2504 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) { 2505 return JNI_EINVAL; 2506 } 2507 // Xmaxf 2508 } else if (match_option(option, "-Xmaxf", &tail)) { 2509 char* err; 2510 int maxf = (int)(strtod(tail, &err) * 100); 2511 if (*err != '\0' || *tail == '\0') { 2512 jio_fprintf(defaultStream::error_stream(), 2513 "Bad max heap free percentage size: %s\n", 2514 option->optionString); 2515 return JNI_EINVAL; 2516 } else { 2517 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) { 2518 return JNI_EINVAL; 2519 } 2520 } 2521 // Xminf 2522 } else if (match_option(option, "-Xminf", &tail)) { 2523 char* err; 2524 int minf = (int)(strtod(tail, &err) * 100); 2525 if (*err != '\0' || *tail == '\0') { 2526 jio_fprintf(defaultStream::error_stream(), 2527 "Bad min heap free percentage size: %s\n", 2528 option->optionString); 2529 return JNI_EINVAL; 2530 } else { 2531 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) { 2532 return JNI_EINVAL; 2533 } 2534 } 2535 // -Xss 2536 } else if (match_option(option, "-Xss", &tail)) { 2537 julong long_ThreadStackSize = 0; 2538 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2539 if (errcode != arg_in_range) { 2540 jio_fprintf(defaultStream::error_stream(), 2541 "Invalid thread stack size: %s\n", option->optionString); 2542 describe_range_error(errcode); 2543 return JNI_EINVAL; 2544 } 2545 // Internally track ThreadStackSize in units of 1024 bytes. 2546 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, 2547 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) { 2548 return JNI_EINVAL; 2549 } 2550 // -Xoss 2551 } else if (match_option(option, "-Xoss", &tail)) { 2552 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2553 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2554 julong long_CodeCacheExpansionSize = 0; 2555 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2556 if (errcode != arg_in_range) { 2557 jio_fprintf(defaultStream::error_stream(), 2558 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2559 os::vm_page_size()/K); 2560 return JNI_EINVAL; 2561 } 2562 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) { 2563 return JNI_EINVAL; 2564 } 2565 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2566 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2567 julong long_ReservedCodeCacheSize = 0; 2568 2569 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2570 if (errcode != arg_in_range) { 2571 jio_fprintf(defaultStream::error_stream(), 2572 "Invalid maximum code cache size: %s.\n", option->optionString); 2573 return JNI_EINVAL; 2574 } 2575 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) { 2576 return JNI_EINVAL; 2577 } 2578 // -XX:NonNMethodCodeHeapSize= 2579 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 2580 julong long_NonNMethodCodeHeapSize = 0; 2581 2582 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 2583 if (errcode != arg_in_range) { 2584 jio_fprintf(defaultStream::error_stream(), 2585 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 2586 return JNI_EINVAL; 2587 } 2588 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) { 2589 return JNI_EINVAL; 2590 } 2591 // -XX:ProfiledCodeHeapSize= 2592 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 2593 julong long_ProfiledCodeHeapSize = 0; 2594 2595 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 2596 if (errcode != arg_in_range) { 2597 jio_fprintf(defaultStream::error_stream(), 2598 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 2599 return JNI_EINVAL; 2600 } 2601 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) { 2602 return JNI_EINVAL; 2603 } 2604 // -XX:NonProfiledCodeHeapSizee= 2605 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 2606 julong long_NonProfiledCodeHeapSize = 0; 2607 2608 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 2609 if (errcode != arg_in_range) { 2610 jio_fprintf(defaultStream::error_stream(), 2611 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 2612 return JNI_EINVAL; 2613 } 2614 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) { 2615 return JNI_EINVAL; 2616 } 2617 // -green 2618 } else if (match_option(option, "-green")) { 2619 jio_fprintf(defaultStream::error_stream(), 2620 "Green threads support not available\n"); 2621 return JNI_EINVAL; 2622 // -native 2623 } else if (match_option(option, "-native")) { 2624 // HotSpot always uses native threads, ignore silently for compatibility 2625 // -Xsqnopause 2626 } else if (match_option(option, "-Xsqnopause")) { 2627 // EVM option, ignore silently for compatibility 2628 // -Xrs 2629 } else if (match_option(option, "-Xrs")) { 2630 // Classic/EVM option, new functionality 2631 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) { 2632 return JNI_EINVAL; 2633 } 2634 } else if (match_option(option, "-Xusealtsigs")) { 2635 // change default internal VM signals used - lower case for back compat 2636 if (FLAG_SET_CMDLINE(bool, UseAltSigs, true) != Flag::SUCCESS) { 2637 return JNI_EINVAL; 2638 } 2639 // -Xoptimize 2640 } else if (match_option(option, "-Xoptimize")) { 2641 // EVM option, ignore silently for compatibility 2642 // -Xprof 2643 } else if (match_option(option, "-Xprof")) { 2644 #if INCLUDE_FPROF 2645 _has_profile = true; 2646 #else // INCLUDE_FPROF 2647 jio_fprintf(defaultStream::error_stream(), 2648 "Flat profiling is not supported in this VM.\n"); 2649 return JNI_ERR; 2650 #endif // INCLUDE_FPROF 2651 // -Xconcurrentio 2652 } else if (match_option(option, "-Xconcurrentio")) { 2653 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) { 2654 return JNI_EINVAL; 2655 } 2656 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 2657 return JNI_EINVAL; 2658 } 2659 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) { 2660 return JNI_EINVAL; 2661 } 2662 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) { 2663 return JNI_EINVAL; 2664 } 2665 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation 2666 return JNI_EINVAL; 2667 } 2668 2669 // -Xinternalversion 2670 } else if (match_option(option, "-Xinternalversion")) { 2671 jio_fprintf(defaultStream::output_stream(), "%s\n", 2672 VM_Version::internal_vm_info_string()); 2673 vm_exit(0); 2674 #ifndef PRODUCT 2675 // -Xprintflags 2676 } else if (match_option(option, "-Xprintflags")) { 2677 CommandLineFlags::printFlags(tty, false); 2678 vm_exit(0); 2679 #endif 2680 // -D 2681 } else if (match_option(option, "-D", &tail)) { 2682 const char* value; 2683 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2684 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2685 // abort if -Djava.endorsed.dirs is set 2686 jio_fprintf(defaultStream::output_stream(), 2687 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2688 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2689 return JNI_EINVAL; 2690 } 2691 if (match_option(option, "-Djava.ext.dirs=", &value) && 2692 *value != '\0' && strcmp(value, "\"\"") != 0) { 2693 // abort if -Djava.ext.dirs is set 2694 jio_fprintf(defaultStream::output_stream(), 2695 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2696 return JNI_EINVAL; 2697 } 2698 2699 if (!add_property(tail)) { 2700 return JNI_ENOMEM; 2701 } 2702 // Out of the box management support 2703 if (match_option(option, "-Dcom.sun.management", &tail)) { 2704 #if INCLUDE_MANAGEMENT 2705 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) { 2706 return JNI_EINVAL; 2707 } 2708 #else 2709 jio_fprintf(defaultStream::output_stream(), 2710 "-Dcom.sun.management is not supported in this VM.\n"); 2711 return JNI_ERR; 2712 #endif 2713 } 2714 // -Xint 2715 } else if (match_option(option, "-Xint")) { 2716 set_mode_flags(_int); 2717 // -Xmixed 2718 } else if (match_option(option, "-Xmixed")) { 2719 set_mode_flags(_mixed); 2720 // -Xcomp 2721 } else if (match_option(option, "-Xcomp")) { 2722 // for testing the compiler; turn off all flags that inhibit compilation 2723 set_mode_flags(_comp); 2724 // -Xshare:dump 2725 } else if (match_option(option, "-Xshare:dump")) { 2726 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) { 2727 return JNI_EINVAL; 2728 } 2729 set_mode_flags(_int); // Prevent compilation, which creates objects 2730 // -Xshare:on 2731 } else if (match_option(option, "-Xshare:on")) { 2732 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 2733 return JNI_EINVAL; 2734 } 2735 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 2736 return JNI_EINVAL; 2737 } 2738 // -Xshare:auto 2739 } else if (match_option(option, "-Xshare:auto")) { 2740 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 2741 return JNI_EINVAL; 2742 } 2743 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 2744 return JNI_EINVAL; 2745 } 2746 // -Xshare:off 2747 } else if (match_option(option, "-Xshare:off")) { 2748 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) { 2749 return JNI_EINVAL; 2750 } 2751 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 2752 return JNI_EINVAL; 2753 } 2754 // -Xverify 2755 } else if (match_option(option, "-Xverify", &tail)) { 2756 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2757 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) { 2758 return JNI_EINVAL; 2759 } 2760 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 2761 return JNI_EINVAL; 2762 } 2763 } else if (strcmp(tail, ":remote") == 0) { 2764 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 2765 return JNI_EINVAL; 2766 } 2767 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 2768 return JNI_EINVAL; 2769 } 2770 } else if (strcmp(tail, ":none") == 0) { 2771 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 2772 return JNI_EINVAL; 2773 } 2774 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) { 2775 return JNI_EINVAL; 2776 } 2777 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2778 return JNI_EINVAL; 2779 } 2780 // -Xdebug 2781 } else if (match_option(option, "-Xdebug")) { 2782 // note this flag has been used, then ignore 2783 set_xdebug_mode(true); 2784 // -Xnoagent 2785 } else if (match_option(option, "-Xnoagent")) { 2786 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2787 } else if (match_option(option, "-Xboundthreads")) { 2788 // Ignore silently for compatibility 2789 } else if (match_option(option, "-Xloggc:", &tail)) { 2790 // Redirect GC output to the file. -Xloggc:<filename> 2791 // ostream_init_log(), when called will use this filename 2792 // to initialize a fileStream. 2793 _gc_log_filename = os::strdup_check_oom(tail); 2794 if (!is_filename_valid(_gc_log_filename)) { 2795 jio_fprintf(defaultStream::output_stream(), 2796 "Invalid file name for use with -Xloggc: Filename can only contain the " 2797 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 2798 "Note %%p or %%t can only be used once\n", _gc_log_filename); 2799 return JNI_EINVAL; 2800 } 2801 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) { 2802 return JNI_EINVAL; 2803 } 2804 if (FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true) != Flag::SUCCESS) { 2805 return JNI_EINVAL; 2806 } 2807 // JNI hooks 2808 } else if (match_option(option, "-Xcheck", &tail)) { 2809 if (!strcmp(tail, ":jni")) { 2810 #if !INCLUDE_JNI_CHECK 2811 warning("JNI CHECKING is not supported in this VM"); 2812 #else 2813 CheckJNICalls = true; 2814 #endif // INCLUDE_JNI_CHECK 2815 } else if (is_bad_option(option, args->ignoreUnrecognized, 2816 "check")) { 2817 return JNI_EINVAL; 2818 } 2819 } else if (match_option(option, "vfprintf")) { 2820 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2821 } else if (match_option(option, "exit")) { 2822 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2823 } else if (match_option(option, "abort")) { 2824 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2825 // -XX:+AggressiveHeap 2826 } else if (match_option(option, "-XX:+AggressiveHeap")) { 2827 2828 // This option inspects the machine and attempts to set various 2829 // parameters to be optimal for long-running, memory allocation 2830 // intensive jobs. It is intended for machines with large 2831 // amounts of cpu and memory. 2832 2833 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2834 // VM, but we may not be able to represent the total physical memory 2835 // available (like having 8gb of memory on a box but using a 32bit VM). 2836 // Thus, we need to make sure we're using a julong for intermediate 2837 // calculations. 2838 julong initHeapSize; 2839 julong total_memory = os::physical_memory(); 2840 2841 if (total_memory < (julong)256*M) { 2842 jio_fprintf(defaultStream::error_stream(), 2843 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2844 vm_exit(1); 2845 } 2846 2847 // The heap size is half of available memory, or (at most) 2848 // all of possible memory less 160mb (leaving room for the OS 2849 // when using ISM). This is the maximum; because adaptive sizing 2850 // is turned on below, the actual space used may be smaller. 2851 2852 initHeapSize = MIN2(total_memory / (julong)2, 2853 total_memory - (julong)160*M); 2854 2855 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2856 2857 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2858 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) { 2859 return JNI_EINVAL; 2860 } 2861 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) { 2862 return JNI_EINVAL; 2863 } 2864 // Currently the minimum size and the initial heap sizes are the same. 2865 set_min_heap_size(initHeapSize); 2866 } 2867 if (FLAG_IS_DEFAULT(NewSize)) { 2868 // Make the young generation 3/8ths of the total heap. 2869 if (FLAG_SET_CMDLINE(size_t, NewSize, 2870 ((julong)MaxHeapSize / (julong)8) * (julong)3) != Flag::SUCCESS) { 2871 return JNI_EINVAL; 2872 } 2873 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) { 2874 return JNI_EINVAL; 2875 } 2876 } 2877 2878 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 2879 FLAG_SET_DEFAULT(UseLargePages, true); 2880 #endif 2881 2882 // Increase some data structure sizes for efficiency 2883 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) { 2884 return JNI_EINVAL; 2885 } 2886 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) { 2887 return JNI_EINVAL; 2888 } 2889 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256*K) != Flag::SUCCESS) { 2890 return JNI_EINVAL; 2891 } 2892 2893 // See the OldPLABSize comment below, but replace 'after promotion' 2894 // with 'after copying'. YoungPLABSize is the size of the survivor 2895 // space per-gc-thread buffers. The default is 4kw. 2896 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256*K) != Flag::SUCCESS) { // Note: this is in words 2897 return JNI_EINVAL; 2898 } 2899 2900 // OldPLABSize is the size of the buffers in the old gen that 2901 // UseParallelGC uses to promote live data that doesn't fit in the 2902 // survivor spaces. At any given time, there's one for each gc thread. 2903 // The default size is 1kw. These buffers are rarely used, since the 2904 // survivor spaces are usually big enough. For specjbb, however, there 2905 // are occasions when there's lots of live data in the young gen 2906 // and we end up promoting some of it. We don't have a definite 2907 // explanation for why bumping OldPLABSize helps, but the theory 2908 // is that a bigger PLAB results in retaining something like the 2909 // original allocation order after promotion, which improves mutator 2910 // locality. A minor effect may be that larger PLABs reduce the 2911 // number of PLAB allocation events during gc. The value of 8kw 2912 // was arrived at by experimenting with specjbb. 2913 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8*K) != Flag::SUCCESS) { // Note: this is in words 2914 return JNI_EINVAL; 2915 } 2916 2917 // Enable parallel GC and adaptive generation sizing 2918 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) { 2919 return JNI_EINVAL; 2920 } 2921 FLAG_SET_DEFAULT(ParallelGCThreads, 2922 Abstract_VM_Version::parallel_worker_threads()); 2923 2924 // Encourage steady state memory management 2925 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) { 2926 return JNI_EINVAL; 2927 } 2928 2929 // This appears to improve mutator locality 2930 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 2931 return JNI_EINVAL; 2932 } 2933 2934 // Get around early Solaris scheduling bug 2935 // (affinity vs other jobs on system) 2936 // but disallow DR and offlining (5008695). 2937 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) { 2938 return JNI_EINVAL; 2939 } 2940 2941 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 2942 // and the last option wins. 2943 } else if (match_option(option, "-XX:+NeverTenure")) { 2944 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) { 2945 return JNI_EINVAL; 2946 } 2947 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 2948 return JNI_EINVAL; 2949 } 2950 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) { 2951 return JNI_EINVAL; 2952 } 2953 } else if (match_option(option, "-XX:+AlwaysTenure")) { 2954 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 2955 return JNI_EINVAL; 2956 } 2957 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 2958 return JNI_EINVAL; 2959 } 2960 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) { 2961 return JNI_EINVAL; 2962 } 2963 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 2964 uintx max_tenuring_thresh = 0; 2965 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 2966 jio_fprintf(defaultStream::error_stream(), 2967 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 2968 return JNI_EINVAL; 2969 } 2970 2971 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) { 2972 return JNI_EINVAL; 2973 } 2974 2975 if (MaxTenuringThreshold == 0) { 2976 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 2977 return JNI_EINVAL; 2978 } 2979 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 2980 return JNI_EINVAL; 2981 } 2982 } else { 2983 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 2984 return JNI_EINVAL; 2985 } 2986 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 2987 return JNI_EINVAL; 2988 } 2989 } 2990 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 2991 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) { 2992 return JNI_EINVAL; 2993 } 2994 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) { 2995 return JNI_EINVAL; 2996 } 2997 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 2998 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) { 2999 return JNI_EINVAL; 3000 } 3001 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) { 3002 return JNI_EINVAL; 3003 } 3004 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3005 #if defined(DTRACE_ENABLED) 3006 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) { 3007 return JNI_EINVAL; 3008 } 3009 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) { 3010 return JNI_EINVAL; 3011 } 3012 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) { 3013 return JNI_EINVAL; 3014 } 3015 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) { 3016 return JNI_EINVAL; 3017 } 3018 #else // defined(DTRACE_ENABLED) 3019 jio_fprintf(defaultStream::error_stream(), 3020 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3021 return JNI_EINVAL; 3022 #endif // defined(DTRACE_ENABLED) 3023 #ifdef ASSERT 3024 } else if (match_option(option, "-XX:+FullGCALot")) { 3025 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) { 3026 return JNI_EINVAL; 3027 } 3028 // disable scavenge before parallel mark-compact 3029 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 3030 return JNI_EINVAL; 3031 } 3032 #endif 3033 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3034 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3035 julong stack_size = 0; 3036 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3037 if (errcode != arg_in_range) { 3038 jio_fprintf(defaultStream::error_stream(), 3039 "Invalid mark stack size: %s\n", option->optionString); 3040 describe_range_error(errcode); 3041 return JNI_EINVAL; 3042 } 3043 jio_fprintf(defaultStream::error_stream(), 3044 "Please use -XX:MarkStackSize in place of " 3045 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n"); 3046 if (FLAG_SET_CMDLINE(size_t, MarkStackSize, stack_size) != Flag::SUCCESS) { 3047 return JNI_EINVAL; 3048 } 3049 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3050 julong max_stack_size = 0; 3051 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3052 if (errcode != arg_in_range) { 3053 jio_fprintf(defaultStream::error_stream(), 3054 "Invalid maximum mark stack size: %s\n", 3055 option->optionString); 3056 describe_range_error(errcode); 3057 return JNI_EINVAL; 3058 } 3059 jio_fprintf(defaultStream::error_stream(), 3060 "Please use -XX:MarkStackSizeMax in place of " 3061 "-XX:CMSMarkStackSizeMax in the future\n"); 3062 if (FLAG_SET_CMDLINE(size_t, MarkStackSizeMax, max_stack_size) != Flag::SUCCESS) { 3063 return JNI_EINVAL; 3064 } 3065 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3066 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3067 uintx conc_threads = 0; 3068 if (!parse_uintx(tail, &conc_threads, 1)) { 3069 jio_fprintf(defaultStream::error_stream(), 3070 "Invalid concurrent threads: %s\n", option->optionString); 3071 return JNI_EINVAL; 3072 } 3073 jio_fprintf(defaultStream::error_stream(), 3074 "Please use -XX:ConcGCThreads in place of " 3075 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n"); 3076 if (FLAG_SET_CMDLINE(uint, ConcGCThreads, conc_threads) != Flag::SUCCESS) { 3077 return JNI_EINVAL; 3078 } 3079 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3080 julong max_direct_memory_size = 0; 3081 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3082 if (errcode != arg_in_range) { 3083 jio_fprintf(defaultStream::error_stream(), 3084 "Invalid maximum direct memory size: %s\n", 3085 option->optionString); 3086 describe_range_error(errcode); 3087 return JNI_EINVAL; 3088 } 3089 if (FLAG_SET_CMDLINE(size_t, MaxDirectMemorySize, max_direct_memory_size) != Flag::SUCCESS) { 3090 return JNI_EINVAL; 3091 } 3092 #if !INCLUDE_MANAGEMENT 3093 } else if (match_option(option, "-XX:+ManagementServer")) { 3094 jio_fprintf(defaultStream::error_stream(), 3095 "ManagementServer is not supported in this VM.\n"); 3096 return JNI_ERR; 3097 #endif // INCLUDE_MANAGEMENT 3098 // CreateMinidumpOnCrash is removed, and replaced by CreateCoredumpOnCrash 3099 } else if (match_option(option, "-XX:+CreateMinidumpOnCrash")) { 3100 if (FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, true) != Flag::SUCCESS) { 3101 return JNI_EINVAL; 3102 } 3103 jio_fprintf(defaultStream::output_stream(), 3104 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is on\n"); 3105 } else if (match_option(option, "-XX:-CreateMinidumpOnCrash")) { 3106 if (FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, false) != Flag::SUCCESS) { 3107 return JNI_EINVAL; 3108 } 3109 jio_fprintf(defaultStream::output_stream(), 3110 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is off\n"); 3111 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3112 // Skip -XX:Flags= since that case has already been handled 3113 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3114 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3115 return JNI_EINVAL; 3116 } 3117 } 3118 // Unknown option 3119 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3120 return JNI_ERR; 3121 } 3122 } 3123 3124 // PrintSharedArchiveAndExit will turn on 3125 // -Xshare:on 3126 // -XX:+TraceClassPaths 3127 if (PrintSharedArchiveAndExit) { 3128 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3129 return JNI_EINVAL; 3130 } 3131 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3132 return JNI_EINVAL; 3133 } 3134 if (FLAG_SET_CMDLINE(bool, TraceClassPaths, true) != Flag::SUCCESS) { 3135 return JNI_EINVAL; 3136 } 3137 } 3138 3139 // Change the default value for flags which have different default values 3140 // when working with older JDKs. 3141 #ifdef LINUX 3142 if (JDK_Version::current().compare_major(6) <= 0 && 3143 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3144 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3145 } 3146 #endif // LINUX 3147 fix_appclasspath(); 3148 return JNI_OK; 3149 } 3150 3151 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3152 // 3153 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3154 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3155 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3156 // path is treated as the current directory. 3157 // 3158 // This causes problems with CDS, which requires that all directories specified in the classpath 3159 // must be empty. In most cases, applications do NOT want to load classes from the current 3160 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3161 // scripts compatible with CDS. 3162 void Arguments::fix_appclasspath() { 3163 if (IgnoreEmptyClassPaths) { 3164 const char separator = *os::path_separator(); 3165 const char* src = _java_class_path->value(); 3166 3167 // skip over all the leading empty paths 3168 while (*src == separator) { 3169 src ++; 3170 } 3171 3172 char* copy = os::strdup_check_oom(src, mtInternal); 3173 3174 // trim all trailing empty paths 3175 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3176 *tail = '\0'; 3177 } 3178 3179 char from[3] = {separator, separator, '\0'}; 3180 char to [2] = {separator, '\0'}; 3181 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3182 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3183 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3184 } 3185 3186 _java_class_path->set_value(copy); 3187 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3188 } 3189 3190 if (!PrintSharedArchiveAndExit) { 3191 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value()); 3192 } 3193 } 3194 3195 static bool has_jar_files(const char* directory) { 3196 DIR* dir = os::opendir(directory); 3197 if (dir == NULL) return false; 3198 3199 struct dirent *entry; 3200 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 3201 bool hasJarFile = false; 3202 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3203 const char* name = entry->d_name; 3204 const char* ext = name + strlen(name) - 4; 3205 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3206 } 3207 FREE_C_HEAP_ARRAY(char, dbuf); 3208 os::closedir(dir); 3209 return hasJarFile ; 3210 } 3211 3212 static int check_non_empty_dirs(const char* path) { 3213 const char separator = *os::path_separator(); 3214 const char* const end = path + strlen(path); 3215 int nonEmptyDirs = 0; 3216 while (path < end) { 3217 const char* tmp_end = strchr(path, separator); 3218 if (tmp_end == NULL) { 3219 if (has_jar_files(path)) { 3220 nonEmptyDirs++; 3221 jio_fprintf(defaultStream::output_stream(), 3222 "Non-empty directory: %s\n", path); 3223 } 3224 path = end; 3225 } else { 3226 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 3227 memcpy(dirpath, path, tmp_end - path); 3228 dirpath[tmp_end - path] = '\0'; 3229 if (has_jar_files(dirpath)) { 3230 nonEmptyDirs++; 3231 jio_fprintf(defaultStream::output_stream(), 3232 "Non-empty directory: %s\n", dirpath); 3233 } 3234 FREE_C_HEAP_ARRAY(char, dirpath); 3235 path = tmp_end + 1; 3236 } 3237 } 3238 return nonEmptyDirs; 3239 } 3240 3241 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3242 // check if the default lib/endorsed directory exists; if so, error 3243 char path[JVM_MAXPATHLEN]; 3244 const char* fileSep = os::file_separator(); 3245 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3246 3247 if (CheckEndorsedAndExtDirs) { 3248 int nonEmptyDirs = 0; 3249 // check endorsed directory 3250 nonEmptyDirs += check_non_empty_dirs(path); 3251 // check the extension directories 3252 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3253 if (nonEmptyDirs > 0) { 3254 return JNI_ERR; 3255 } 3256 } 3257 3258 DIR* dir = os::opendir(path); 3259 if (dir != NULL) { 3260 jio_fprintf(defaultStream::output_stream(), 3261 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3262 "in modular form will be supported via the concept of upgradeable modules.\n"); 3263 os::closedir(dir); 3264 return JNI_ERR; 3265 } 3266 3267 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3268 dir = os::opendir(path); 3269 if (dir != NULL) { 3270 jio_fprintf(defaultStream::output_stream(), 3271 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3272 "Use -classpath instead.\n."); 3273 os::closedir(dir); 3274 return JNI_ERR; 3275 } 3276 3277 if (scp_assembly_required) { 3278 // Assemble the bootclasspath elements into the final path. 3279 Arguments::set_sysclasspath(scp_p->combined_path()); 3280 } 3281 3282 // This must be done after all arguments have been processed. 3283 // java_compiler() true means set to "NONE" or empty. 3284 if (java_compiler() && !xdebug_mode()) { 3285 // For backwards compatibility, we switch to interpreted mode if 3286 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3287 // not specified. 3288 set_mode_flags(_int); 3289 } 3290 3291 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3292 // but like -Xint, leave compilation thresholds unaffected. 3293 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3294 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3295 set_mode_flags(_int); 3296 } 3297 3298 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3299 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3300 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3301 } 3302 3303 #ifndef COMPILER2 3304 // Don't degrade server performance for footprint 3305 if (FLAG_IS_DEFAULT(UseLargePages) && 3306 MaxHeapSize < LargePageHeapSizeThreshold) { 3307 // No need for large granularity pages w/small heaps. 3308 // Note that large pages are enabled/disabled for both the 3309 // Java heap and the code cache. 3310 FLAG_SET_DEFAULT(UseLargePages, false); 3311 } 3312 3313 #else 3314 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3315 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3316 } 3317 #endif 3318 3319 #ifndef TIERED 3320 // Tiered compilation is undefined. 3321 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3322 #endif 3323 3324 // If we are running in a headless jre, force java.awt.headless property 3325 // to be true unless the property has already been set. 3326 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3327 if (os::is_headless_jre()) { 3328 const char* headless = Arguments::get_property("java.awt.headless"); 3329 if (headless == NULL) { 3330 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3331 if (headless_env == NULL) { 3332 if (!add_property("java.awt.headless=true")) { 3333 return JNI_ENOMEM; 3334 } 3335 } else { 3336 char buffer[256]; 3337 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env); 3338 if (!add_property(buffer)) { 3339 return JNI_ENOMEM; 3340 } 3341 } 3342 } 3343 } 3344 3345 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) { 3346 // CMS can only be used with ParNew 3347 FLAG_SET_ERGO(bool, UseParNewGC, true); 3348 } 3349 3350 if (!check_vm_args_consistency()) { 3351 return JNI_ERR; 3352 } 3353 3354 return JNI_OK; 3355 } 3356 3357 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3358 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3359 scp_assembly_required_p); 3360 } 3361 3362 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3363 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3364 scp_assembly_required_p); 3365 } 3366 3367 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3368 char *buffer = ::getenv(name); 3369 3370 // Don't check this variable if user has special privileges 3371 // (e.g. unix su command). 3372 if (buffer == NULL || os::have_special_privileges()) { 3373 return JNI_OK; 3374 } 3375 3376 if ((buffer = os::strdup(buffer)) == NULL) { 3377 return JNI_ENOMEM; 3378 } 3379 3380 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array 3381 jio_fprintf(defaultStream::error_stream(), 3382 "Picked up %s: %s\n", name, buffer); 3383 char* rd = buffer; // pointer to the input string (rd) 3384 while (true) { // repeat for all options in the input string 3385 while (isspace(*rd)) rd++; // skip whitespace 3386 if (*rd == 0) break; // we re done when the input string is read completely 3387 3388 // The output, option string, overwrites the input string. 3389 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3390 // input string (rd). 3391 char* wrt = rd; 3392 3393 JavaVMOption option; 3394 option.optionString = wrt; 3395 options->append(option); // Fill in option 3396 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3397 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3398 int quote = *rd; // matching quote to look for 3399 rd++; // don't copy open quote 3400 while (*rd != quote) { // include everything (even spaces) up until quote 3401 if (*rd == 0) { // string termination means unmatched string 3402 jio_fprintf(defaultStream::error_stream(), 3403 "Unmatched quote in %s\n", name); 3404 delete options; 3405 os::free(buffer); 3406 return JNI_ERR; 3407 } 3408 *wrt++ = *rd++; // copy to option string 3409 } 3410 rd++; // don't copy close quote 3411 } else { 3412 *wrt++ = *rd++; // copy to option string 3413 } 3414 } 3415 // Need to check if we're done before writing a NULL, 3416 // because the write could be to the byte that rd is pointing to. 3417 if (*rd++ == 0) { 3418 *wrt = 0; 3419 break; 3420 } 3421 *wrt = 0; // Zero terminate option 3422 } 3423 JavaVMOption* options_arr = 3424 NEW_C_HEAP_ARRAY_RETURN_NULL(JavaVMOption, options->length(), mtInternal); 3425 if (options_arr == NULL) { 3426 delete options; 3427 os::free(buffer); 3428 return JNI_ENOMEM; 3429 } 3430 for (int i = 0; i < options->length(); i++) { 3431 options_arr[i] = options->at(i); 3432 } 3433 3434 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3435 JavaVMInitArgs vm_args; 3436 vm_args.version = JNI_VERSION_1_2; 3437 vm_args.options = options_arr; 3438 vm_args.nOptions = options->length(); 3439 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3440 3441 if (PrintVMOptions) { 3442 const char* tail; 3443 for (int i = 0; i < vm_args.nOptions; i++) { 3444 const JavaVMOption *option = vm_args.options + i; 3445 if (match_option(option, "-XX:", &tail)) { 3446 logOption(tail); 3447 } 3448 } 3449 } 3450 3451 jint result = parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, 3452 Flag::ENVIRON_VAR); 3453 FREE_C_HEAP_ARRAY(JavaVMOption, options_arr); 3454 delete options; 3455 os::free(buffer); 3456 return result; 3457 } 3458 3459 void Arguments::set_shared_spaces_flags() { 3460 if (DumpSharedSpaces) { 3461 if (RequireSharedSpaces) { 3462 warning("cannot dump shared archive while using shared archive"); 3463 } 3464 UseSharedSpaces = false; 3465 #ifdef _LP64 3466 if (!UseCompressedOops || !UseCompressedClassPointers) { 3467 vm_exit_during_initialization( 3468 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3469 } 3470 } else { 3471 if (!UseCompressedOops || !UseCompressedClassPointers) { 3472 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3473 } 3474 #endif 3475 } 3476 } 3477 3478 #if !INCLUDE_ALL_GCS 3479 static void force_serial_gc() { 3480 FLAG_SET_DEFAULT(UseSerialGC, true); 3481 UNSUPPORTED_GC_OPTION(UseG1GC); 3482 UNSUPPORTED_GC_OPTION(UseParallelGC); 3483 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3484 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3485 UNSUPPORTED_GC_OPTION(UseParNewGC); 3486 } 3487 #endif // INCLUDE_ALL_GCS 3488 3489 // Sharing support 3490 // Construct the path to the archive 3491 static char* get_shared_archive_path() { 3492 char *shared_archive_path; 3493 if (SharedArchiveFile == NULL) { 3494 char jvm_path[JVM_MAXPATHLEN]; 3495 os::jvm_path(jvm_path, sizeof(jvm_path)); 3496 char *end = strrchr(jvm_path, *os::file_separator()); 3497 if (end != NULL) *end = '\0'; 3498 size_t jvm_path_len = strlen(jvm_path); 3499 size_t file_sep_len = strlen(os::file_separator()); 3500 const size_t len = jvm_path_len + file_sep_len + 20; 3501 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal); 3502 if (shared_archive_path != NULL) { 3503 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 3504 jvm_path, os::file_separator()); 3505 } 3506 } else { 3507 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal); 3508 } 3509 return shared_archive_path; 3510 } 3511 3512 #ifndef PRODUCT 3513 // Determine whether LogVMOutput should be implicitly turned on. 3514 static bool use_vm_log() { 3515 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3516 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3517 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3518 PrintAssembly || TraceDeoptimization || TraceDependencies || 3519 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3520 return true; 3521 } 3522 3523 #ifdef COMPILER1 3524 if (PrintC1Statistics) { 3525 return true; 3526 } 3527 #endif // COMPILER1 3528 3529 #ifdef COMPILER2 3530 if (PrintOptoAssembly || PrintOptoStatistics) { 3531 return true; 3532 } 3533 #endif // COMPILER2 3534 3535 return false; 3536 } 3537 #endif // PRODUCT 3538 3539 // Parse entry point called from JNI_CreateJavaVM 3540 3541 jint Arguments::parse(const JavaVMInitArgs* args) { 3542 3543 // Initialize ranges and constraints 3544 CommandLineFlagRangeList::init(); 3545 CommandLineFlagConstraintList::init(); 3546 3547 // Remaining part of option string 3548 const char* tail; 3549 3550 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3551 const char* hotspotrc = ".hotspotrc"; 3552 bool settings_file_specified = false; 3553 bool needs_hotspotrc_warning = false; 3554 3555 const char* flags_file; 3556 int index; 3557 for (index = 0; index < args->nOptions; index++) { 3558 const JavaVMOption *option = args->options + index; 3559 if (ArgumentsExt::process_options(option)) { 3560 continue; 3561 } 3562 if (match_option(option, "-XX:Flags=", &tail)) { 3563 flags_file = tail; 3564 settings_file_specified = true; 3565 continue; 3566 } 3567 if (match_option(option, "-XX:+PrintVMOptions")) { 3568 PrintVMOptions = true; 3569 continue; 3570 } 3571 if (match_option(option, "-XX:-PrintVMOptions")) { 3572 PrintVMOptions = false; 3573 continue; 3574 } 3575 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3576 IgnoreUnrecognizedVMOptions = true; 3577 continue; 3578 } 3579 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3580 IgnoreUnrecognizedVMOptions = false; 3581 continue; 3582 } 3583 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3584 CommandLineFlags::printFlags(tty, false); 3585 vm_exit(0); 3586 } 3587 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3588 #if INCLUDE_NMT 3589 // The launcher did not setup nmt environment variable properly. 3590 if (!MemTracker::check_launcher_nmt_support(tail)) { 3591 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3592 } 3593 3594 // Verify if nmt option is valid. 3595 if (MemTracker::verify_nmt_option()) { 3596 // Late initialization, still in single-threaded mode. 3597 if (MemTracker::tracking_level() >= NMT_summary) { 3598 MemTracker::init(); 3599 } 3600 } else { 3601 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3602 } 3603 continue; 3604 #else 3605 jio_fprintf(defaultStream::error_stream(), 3606 "Native Memory Tracking is not supported in this VM\n"); 3607 return JNI_ERR; 3608 #endif 3609 } 3610 3611 #ifndef PRODUCT 3612 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3613 CommandLineFlags::printFlags(tty, true); 3614 vm_exit(0); 3615 } 3616 #endif 3617 } 3618 3619 if (IgnoreUnrecognizedVMOptions) { 3620 // uncast const to modify the flag args->ignoreUnrecognized 3621 *(jboolean*)(&args->ignoreUnrecognized) = true; 3622 } 3623 3624 // Parse specified settings file 3625 if (settings_file_specified) { 3626 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3627 return JNI_EINVAL; 3628 } 3629 } else { 3630 #ifdef ASSERT 3631 // Parse default .hotspotrc settings file 3632 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3633 return JNI_EINVAL; 3634 } 3635 #else 3636 struct stat buf; 3637 if (os::stat(hotspotrc, &buf) == 0) { 3638 needs_hotspotrc_warning = true; 3639 } 3640 #endif 3641 } 3642 3643 if (PrintVMOptions) { 3644 for (index = 0; index < args->nOptions; index++) { 3645 const JavaVMOption *option = args->options + index; 3646 if (match_option(option, "-XX:", &tail)) { 3647 logOption(tail); 3648 } 3649 } 3650 } 3651 3652 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3653 jint result = parse_vm_init_args(args); 3654 if (result != JNI_OK) { 3655 return result; 3656 } 3657 3658 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3659 SharedArchivePath = get_shared_archive_path(); 3660 if (SharedArchivePath == NULL) { 3661 return JNI_ENOMEM; 3662 } 3663 3664 // Set up VerifySharedSpaces 3665 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 3666 VerifySharedSpaces = true; 3667 } 3668 3669 // Delay warning until here so that we've had a chance to process 3670 // the -XX:-PrintWarnings flag 3671 if (needs_hotspotrc_warning) { 3672 warning("%s file is present but has been ignored. " 3673 "Run with -XX:Flags=%s to load the file.", 3674 hotspotrc, hotspotrc); 3675 } 3676 3677 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 3678 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3679 #endif 3680 3681 ArgumentsExt::report_unsupported_options(); 3682 3683 #ifndef PRODUCT 3684 if (TraceBytecodesAt != 0) { 3685 TraceBytecodes = true; 3686 } 3687 if (CountCompiledCalls) { 3688 if (UseCounterDecay) { 3689 warning("UseCounterDecay disabled because CountCalls is set"); 3690 UseCounterDecay = false; 3691 } 3692 } 3693 #endif // PRODUCT 3694 3695 if (ScavengeRootsInCode == 0) { 3696 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3697 warning("forcing ScavengeRootsInCode non-zero"); 3698 } 3699 ScavengeRootsInCode = 1; 3700 } 3701 3702 if (PrintGCDetails) { 3703 // Turn on -verbose:gc options as well 3704 PrintGC = true; 3705 } 3706 3707 // Set object alignment values. 3708 set_object_alignment(); 3709 3710 #if !INCLUDE_ALL_GCS 3711 force_serial_gc(); 3712 #endif // INCLUDE_ALL_GCS 3713 #if !INCLUDE_CDS 3714 if (DumpSharedSpaces || RequireSharedSpaces) { 3715 jio_fprintf(defaultStream::error_stream(), 3716 "Shared spaces are not supported in this VM\n"); 3717 return JNI_ERR; 3718 } 3719 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3720 warning("Shared spaces are not supported in this VM"); 3721 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3722 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3723 } 3724 no_shared_spaces("CDS Disabled"); 3725 #endif // INCLUDE_CDS 3726 3727 return JNI_OK; 3728 } 3729 3730 jint Arguments::apply_ergo() { 3731 3732 // Set flags based on ergonomics. 3733 set_ergonomics_flags(); 3734 3735 set_shared_spaces_flags(); 3736 3737 // Check the GC selections again. 3738 if (!check_gc_consistency()) { 3739 return JNI_EINVAL; 3740 } 3741 3742 if (TieredCompilation) { 3743 set_tiered_flags(); 3744 } else { 3745 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3746 if (CompilationPolicyChoice >= 2) { 3747 vm_exit_during_initialization( 3748 "Incompatible compilation policy selected", NULL); 3749 } 3750 // Scale CompileThreshold 3751 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 3752 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 3753 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 3754 } 3755 } 3756 3757 #ifdef COMPILER2 3758 #ifndef PRODUCT 3759 if (PrintIdealGraphLevel > 0) { 3760 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 3761 } 3762 #endif 3763 #endif 3764 3765 // Set heap size based on available physical memory 3766 set_heap_size(); 3767 3768 ArgumentsExt::set_gc_specific_flags(); 3769 3770 // Initialize Metaspace flags and alignments 3771 Metaspace::ergo_initialize(); 3772 3773 // Set bytecode rewriting flags 3774 set_bytecode_flags(); 3775 3776 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 3777 set_aggressive_opts_flags(); 3778 3779 // Turn off biased locking for locking debug mode flags, 3780 // which are subtly different from each other but neither works with 3781 // biased locking 3782 if (UseHeavyMonitors 3783 #ifdef COMPILER1 3784 || !UseFastLocking 3785 #endif // COMPILER1 3786 ) { 3787 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3788 // flag set to true on command line; warn the user that they 3789 // can't enable biased locking here 3790 warning("Biased Locking is not supported with locking debug flags" 3791 "; ignoring UseBiasedLocking flag." ); 3792 } 3793 UseBiasedLocking = false; 3794 } 3795 3796 #ifdef ZERO 3797 // Clear flags not supported on zero. 3798 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3799 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3800 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3801 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3802 #endif // CC_INTERP 3803 3804 #ifdef COMPILER2 3805 if (!EliminateLocks) { 3806 EliminateNestedLocks = false; 3807 } 3808 if (!Inline) { 3809 IncrementalInline = false; 3810 } 3811 #ifndef PRODUCT 3812 if (!IncrementalInline) { 3813 AlwaysIncrementalInline = false; 3814 } 3815 #endif 3816 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 3817 // nothing to use the profiling, turn if off 3818 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 3819 } 3820 #endif 3821 3822 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3823 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3824 DebugNonSafepoints = true; 3825 } 3826 3827 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3828 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3829 } 3830 3831 #ifndef PRODUCT 3832 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3833 if (use_vm_log()) { 3834 LogVMOutput = true; 3835 } 3836 } 3837 #endif // PRODUCT 3838 3839 if (PrintCommandLineFlags) { 3840 CommandLineFlags::printSetFlags(tty); 3841 } 3842 3843 // Apply CPU specific policy for the BiasedLocking 3844 if (UseBiasedLocking) { 3845 if (!VM_Version::use_biased_locking() && 3846 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3847 UseBiasedLocking = false; 3848 } 3849 } 3850 #ifdef COMPILER2 3851 if (!UseBiasedLocking || EmitSync != 0) { 3852 UseOptoBiasInlining = false; 3853 } 3854 #endif 3855 3856 return JNI_OK; 3857 } 3858 3859 jint Arguments::adjust_after_os() { 3860 if (UseNUMA) { 3861 if (UseParallelGC || UseParallelOldGC) { 3862 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3863 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3864 } 3865 } 3866 // UseNUMAInterleaving is set to ON for all collectors and 3867 // platforms when UseNUMA is set to ON. NUMA-aware collectors 3868 // such as the parallel collector for Linux and Solaris will 3869 // interleave old gen and survivor spaces on top of NUMA 3870 // allocation policy for the eden space. 3871 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 3872 // all platforms and ParallelGC on Windows will interleave all 3873 // of the heap spaces across NUMA nodes. 3874 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 3875 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 3876 } 3877 } 3878 return JNI_OK; 3879 } 3880 3881 // Any custom code post the final range and constraint check 3882 // can be done here. We pass a flag that specifies whether 3883 // the check passed successfully 3884 void Arguments::post_final_range_and_constraint_check(bool check_passed) { 3885 // This does not set the flag itself, but stores the value in a safe place for later usage. 3886 _min_heap_free_ratio = MinHeapFreeRatio; 3887 _max_heap_free_ratio = MaxHeapFreeRatio; 3888 } 3889 3890 int Arguments::PropertyList_count(SystemProperty* pl) { 3891 int count = 0; 3892 while(pl != NULL) { 3893 count++; 3894 pl = pl->next(); 3895 } 3896 return count; 3897 } 3898 3899 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3900 assert(key != NULL, "just checking"); 3901 SystemProperty* prop; 3902 for (prop = pl; prop != NULL; prop = prop->next()) { 3903 if (strcmp(key, prop->key()) == 0) return prop->value(); 3904 } 3905 return NULL; 3906 } 3907 3908 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3909 int count = 0; 3910 const char* ret_val = NULL; 3911 3912 while(pl != NULL) { 3913 if(count >= index) { 3914 ret_val = pl->key(); 3915 break; 3916 } 3917 count++; 3918 pl = pl->next(); 3919 } 3920 3921 return ret_val; 3922 } 3923 3924 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3925 int count = 0; 3926 char* ret_val = NULL; 3927 3928 while(pl != NULL) { 3929 if(count >= index) { 3930 ret_val = pl->value(); 3931 break; 3932 } 3933 count++; 3934 pl = pl->next(); 3935 } 3936 3937 return ret_val; 3938 } 3939 3940 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3941 SystemProperty* p = *plist; 3942 if (p == NULL) { 3943 *plist = new_p; 3944 } else { 3945 while (p->next() != NULL) { 3946 p = p->next(); 3947 } 3948 p->set_next(new_p); 3949 } 3950 } 3951 3952 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3953 if (plist == NULL) 3954 return; 3955 3956 SystemProperty* new_p = new SystemProperty(k, v, true); 3957 PropertyList_add(plist, new_p); 3958 } 3959 3960 void Arguments::PropertyList_add(SystemProperty *element) { 3961 PropertyList_add(&_system_properties, element); 3962 } 3963 3964 // This add maintains unique property key in the list. 3965 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3966 if (plist == NULL) 3967 return; 3968 3969 // If property key exist then update with new value. 3970 SystemProperty* prop; 3971 for (prop = *plist; prop != NULL; prop = prop->next()) { 3972 if (strcmp(k, prop->key()) == 0) { 3973 if (append) { 3974 prop->append_value(v); 3975 } else { 3976 prop->set_value(v); 3977 } 3978 return; 3979 } 3980 } 3981 3982 PropertyList_add(plist, k, v); 3983 } 3984 3985 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 3986 // Returns true if all of the source pointed by src has been copied over to 3987 // the destination buffer pointed by buf. Otherwise, returns false. 3988 // Notes: 3989 // 1. If the length (buflen) of the destination buffer excluding the 3990 // NULL terminator character is not long enough for holding the expanded 3991 // pid characters, it also returns false instead of returning the partially 3992 // expanded one. 3993 // 2. The passed in "buflen" should be large enough to hold the null terminator. 3994 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3995 char* buf, size_t buflen) { 3996 const char* p = src; 3997 char* b = buf; 3998 const char* src_end = &src[srclen]; 3999 char* buf_end = &buf[buflen - 1]; 4000 4001 while (p < src_end && b < buf_end) { 4002 if (*p == '%') { 4003 switch (*(++p)) { 4004 case '%': // "%%" ==> "%" 4005 *b++ = *p++; 4006 break; 4007 case 'p': { // "%p" ==> current process id 4008 // buf_end points to the character before the last character so 4009 // that we could write '\0' to the end of the buffer. 4010 size_t buf_sz = buf_end - b + 1; 4011 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4012 4013 // if jio_snprintf fails or the buffer is not long enough to hold 4014 // the expanded pid, returns false. 4015 if (ret < 0 || ret >= (int)buf_sz) { 4016 return false; 4017 } else { 4018 b += ret; 4019 assert(*b == '\0', "fail in copy_expand_pid"); 4020 if (p == src_end && b == buf_end + 1) { 4021 // reach the end of the buffer. 4022 return true; 4023 } 4024 } 4025 p++; 4026 break; 4027 } 4028 default : 4029 *b++ = '%'; 4030 } 4031 } else { 4032 *b++ = *p++; 4033 } 4034 } 4035 *b = '\0'; 4036 return (p == src_end); // return false if not all of the source was copied 4037 }