arguments.cpp revision 8233:5bad519a0fd0
1/* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "precompiled.hpp" 26#include "classfile/classLoader.hpp" 27#include "classfile/javaAssertions.hpp" 28#include "classfile/stringTable.hpp" 29#include "classfile/symbolTable.hpp" 30#include "compiler/compilerOracle.hpp" 31#include "memory/allocation.inline.hpp" 32#include "memory/cardTableRS.hpp" 33#include "memory/genCollectedHeap.hpp" 34#include "memory/referenceProcessor.hpp" 35#include "memory/universe.inline.hpp" 36#include "oops/oop.inline.hpp" 37#include "prims/jvmtiExport.hpp" 38#include "runtime/arguments.hpp" 39#include "runtime/arguments_ext.hpp" 40#include "runtime/globals_extension.hpp" 41#include "runtime/java.hpp" 42#include "runtime/os.hpp" 43#include "runtime/vm_version.hpp" 44#include "services/management.hpp" 45#include "services/memTracker.hpp" 46#include "utilities/defaultStream.hpp" 47#include "utilities/macros.hpp" 48#include "utilities/stringUtils.hpp" 49#include "utilities/taskqueue.hpp" 50#if INCLUDE_ALL_GCS 51#include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 52#include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 53#include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 54#endif // INCLUDE_ALL_GCS 55 56// Note: This is a special bug reporting site for the JVM 57#define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 58#define DEFAULT_JAVA_LAUNCHER "generic" 59 60#define UNSUPPORTED_GC_OPTION(gc) \ 61do { \ 62 if (gc) { \ 63 if (FLAG_IS_CMDLINE(gc)) { \ 64 warning(#gc " is not supported in this VM. Using Serial GC."); \ 65 } \ 66 FLAG_SET_DEFAULT(gc, false); \ 67 } \ 68} while(0) 69 70char** Arguments::_jvm_flags_array = NULL; 71int Arguments::_num_jvm_flags = 0; 72char** Arguments::_jvm_args_array = NULL; 73int Arguments::_num_jvm_args = 0; 74char* Arguments::_java_command = NULL; 75SystemProperty* Arguments::_system_properties = NULL; 76const char* Arguments::_gc_log_filename = NULL; 77bool Arguments::_has_profile = false; 78size_t Arguments::_conservative_max_heap_alignment = 0; 79size_t Arguments::_min_heap_size = 0; 80uintx Arguments::_min_heap_free_ratio = 0; 81uintx Arguments::_max_heap_free_ratio = 0; 82Arguments::Mode Arguments::_mode = _mixed; 83bool Arguments::_java_compiler = false; 84bool Arguments::_xdebug_mode = false; 85const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 86const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 87int Arguments::_sun_java_launcher_pid = -1; 88bool Arguments::_sun_java_launcher_is_altjvm = false; 89 90// These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 91bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 92bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 93bool Arguments::_BackgroundCompilation = BackgroundCompilation; 94bool Arguments::_ClipInlining = ClipInlining; 95intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 96intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 97 98char* Arguments::SharedArchivePath = NULL; 99 100AgentLibraryList Arguments::_libraryList; 101AgentLibraryList Arguments::_agentList; 102 103abort_hook_t Arguments::_abort_hook = NULL; 104exit_hook_t Arguments::_exit_hook = NULL; 105vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 106 107 108SystemProperty *Arguments::_sun_boot_library_path = NULL; 109SystemProperty *Arguments::_java_library_path = NULL; 110SystemProperty *Arguments::_java_home = NULL; 111SystemProperty *Arguments::_java_class_path = NULL; 112SystemProperty *Arguments::_sun_boot_class_path = NULL; 113 114char* Arguments::_ext_dirs = NULL; 115 116// Check if head of 'option' matches 'name', and sets 'tail' to the remaining 117// part of the option string. 118static bool match_option(const JavaVMOption *option, const char* name, 119 const char** tail) { 120 int len = (int)strlen(name); 121 if (strncmp(option->optionString, name, len) == 0) { 122 *tail = option->optionString + len; 123 return true; 124 } else { 125 return false; 126 } 127} 128 129// Check if 'option' matches 'name'. No "tail" is allowed. 130static bool match_option(const JavaVMOption *option, const char* name) { 131 const char* tail = NULL; 132 bool result = match_option(option, name, &tail); 133 if (tail != NULL && *tail == '\0') { 134 return result; 135 } else { 136 return false; 137 } 138} 139 140// Return true if any of the strings in null-terminated array 'names' matches. 141// If tail_allowed is true, then the tail must begin with a colon; otherwise, 142// the option must match exactly. 143static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 144 bool tail_allowed) { 145 for (/* empty */; *names != NULL; ++names) { 146 if (match_option(option, *names, tail)) { 147 if (**tail == '\0' || tail_allowed && **tail == ':') { 148 return true; 149 } 150 } 151 } 152 return false; 153} 154 155static void logOption(const char* opt) { 156 if (PrintVMOptions) { 157 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 158 } 159} 160 161// Process java launcher properties. 162void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 163 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 164 // sun.java.launcher.pid is defined. 165 // Must do this before setting up other system properties, 166 // as some of them may depend on launcher type. 167 for (int index = 0; index < args->nOptions; index++) { 168 const JavaVMOption* option = args->options + index; 169 const char* tail; 170 171 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 172 process_java_launcher_argument(tail, option->extraInfo); 173 continue; 174 } 175 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 176 if (strcmp(tail, "true") == 0) { 177 _sun_java_launcher_is_altjvm = true; 178 } 179 continue; 180 } 181 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 182 _sun_java_launcher_pid = atoi(tail); 183 continue; 184 } 185 } 186} 187 188// Initialize system properties key and value. 189void Arguments::init_system_properties() { 190 191 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 192 "Java Virtual Machine Specification", false)); 193 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 194 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 195 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 196 197 // Following are JVMTI agent writable properties. 198 // Properties values are set to NULL and they are 199 // os specific they are initialized in os::init_system_properties_values(). 200 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 201 _java_library_path = new SystemProperty("java.library.path", NULL, true); 202 _java_home = new SystemProperty("java.home", NULL, true); 203 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 204 205 _java_class_path = new SystemProperty("java.class.path", "", true); 206 207 // Add to System Property list. 208 PropertyList_add(&_system_properties, _sun_boot_library_path); 209 PropertyList_add(&_system_properties, _java_library_path); 210 PropertyList_add(&_system_properties, _java_home); 211 PropertyList_add(&_system_properties, _java_class_path); 212 PropertyList_add(&_system_properties, _sun_boot_class_path); 213 214 // Set OS specific system properties values 215 os::init_system_properties_values(); 216} 217 218 219 // Update/Initialize System properties after JDK version number is known 220void Arguments::init_version_specific_system_properties() { 221 enum { bufsz = 16 }; 222 char buffer[bufsz]; 223 const char* spec_vendor = "Sun Microsystems Inc."; 224 uint32_t spec_version = 0; 225 226 spec_vendor = "Oracle Corporation"; 227 spec_version = JDK_Version::current().major_version(); 228 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 229 230 PropertyList_add(&_system_properties, 231 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 232 PropertyList_add(&_system_properties, 233 new SystemProperty("java.vm.specification.version", buffer, false)); 234 PropertyList_add(&_system_properties, 235 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 236} 237 238/** 239 * Provide a slightly more user-friendly way of eliminating -XX flags. 240 * When a flag is eliminated, it can be added to this list in order to 241 * continue accepting this flag on the command-line, while issuing a warning 242 * and ignoring the value. Once the JDK version reaches the 'accept_until' 243 * limit, we flatly refuse to admit the existence of the flag. This allows 244 * a flag to die correctly over JDK releases using HSX. 245 * But now that HSX is no longer supported only options with a future 246 * accept_until value need to be listed, and the list can be pruned 247 * on each major release. 248 */ 249typedef struct { 250 const char* name; 251 JDK_Version obsoleted_in; // when the flag went away 252 JDK_Version accept_until; // which version to start denying the existence 253} ObsoleteFlag; 254 255static ObsoleteFlag obsolete_jvm_flags[] = { 256 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 257 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 258 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 259 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 260 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 261 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 262 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 263 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) }, 264 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 265 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 266 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 267 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 268 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 269#ifndef ZERO 270 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 271 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 272#endif // ZERO 273 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 274 { "AdaptiveSizePausePolicy", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 275 { "ParallelGCRetainPLAB", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 276 { NULL, JDK_Version(0), JDK_Version(0) } 277}; 278 279// Returns true if the flag is obsolete and fits into the range specified 280// for being ignored. In the case that the flag is ignored, the 'version' 281// value is filled in with the version number when the flag became 282// obsolete so that that value can be displayed to the user. 283bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 284 int i = 0; 285 assert(version != NULL, "Must provide a version buffer"); 286 while (obsolete_jvm_flags[i].name != NULL) { 287 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 288 // <flag>=xxx form 289 // [-|+]<flag> form 290 size_t len = strlen(flag_status.name); 291 if ((strncmp(flag_status.name, s, len) == 0) && 292 (strlen(s) == len)){ 293 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 294 *version = flag_status.obsoleted_in; 295 return true; 296 } 297 } 298 i++; 299 } 300 return false; 301} 302 303// Constructs the system class path (aka boot class path) from the following 304// components, in order: 305// 306// prefix // from -Xbootclasspath/p:... 307// base // from os::get_system_properties() or -Xbootclasspath= 308// suffix // from -Xbootclasspath/a:... 309// 310// This could be AllStatic, but it isn't needed after argument processing is 311// complete. 312class SysClassPath: public StackObj { 313public: 314 SysClassPath(const char* base); 315 ~SysClassPath(); 316 317 inline void set_base(const char* base); 318 inline void add_prefix(const char* prefix); 319 inline void add_suffix_to_prefix(const char* suffix); 320 inline void add_suffix(const char* suffix); 321 inline void reset_path(const char* base); 322 323 inline const char* get_base() const { return _items[_scp_base]; } 324 inline const char* get_prefix() const { return _items[_scp_prefix]; } 325 inline const char* get_suffix() const { return _items[_scp_suffix]; } 326 327 // Combine all the components into a single c-heap-allocated string; caller 328 // must free the string if/when no longer needed. 329 char* combined_path(); 330 331private: 332 // Utility routines. 333 static char* add_to_path(const char* path, const char* str, bool prepend); 334 static char* add_jars_to_path(char* path, const char* directory); 335 336 inline void reset_item_at(int index); 337 338 // Array indices for the items that make up the sysclasspath. All except the 339 // base are allocated in the C heap and freed by this class. 340 enum { 341 _scp_prefix, // from -Xbootclasspath/p:... 342 _scp_base, // the default sysclasspath 343 _scp_suffix, // from -Xbootclasspath/a:... 344 _scp_nitems // the number of items, must be last. 345 }; 346 347 const char* _items[_scp_nitems]; 348}; 349 350SysClassPath::SysClassPath(const char* base) { 351 memset(_items, 0, sizeof(_items)); 352 _items[_scp_base] = base; 353} 354 355SysClassPath::~SysClassPath() { 356 // Free everything except the base. 357 for (int i = 0; i < _scp_nitems; ++i) { 358 if (i != _scp_base) reset_item_at(i); 359 } 360} 361 362inline void SysClassPath::set_base(const char* base) { 363 _items[_scp_base] = base; 364} 365 366inline void SysClassPath::add_prefix(const char* prefix) { 367 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 368} 369 370inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 371 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 372} 373 374inline void SysClassPath::add_suffix(const char* suffix) { 375 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 376} 377 378inline void SysClassPath::reset_item_at(int index) { 379 assert(index < _scp_nitems && index != _scp_base, "just checking"); 380 if (_items[index] != NULL) { 381 FREE_C_HEAP_ARRAY(char, _items[index]); 382 _items[index] = NULL; 383 } 384} 385 386inline void SysClassPath::reset_path(const char* base) { 387 // Clear the prefix and suffix. 388 reset_item_at(_scp_prefix); 389 reset_item_at(_scp_suffix); 390 set_base(base); 391} 392 393//------------------------------------------------------------------------------ 394 395 396// Combine the bootclasspath elements, some of which may be null, into a single 397// c-heap-allocated string. 398char* SysClassPath::combined_path() { 399 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 400 401 size_t lengths[_scp_nitems]; 402 size_t total_len = 0; 403 404 const char separator = *os::path_separator(); 405 406 // Get the lengths. 407 int i; 408 for (i = 0; i < _scp_nitems; ++i) { 409 if (_items[i] != NULL) { 410 lengths[i] = strlen(_items[i]); 411 // Include space for the separator char (or a NULL for the last item). 412 total_len += lengths[i] + 1; 413 } 414 } 415 assert(total_len > 0, "empty sysclasspath not allowed"); 416 417 // Copy the _items to a single string. 418 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 419 char* cp_tmp = cp; 420 for (i = 0; i < _scp_nitems; ++i) { 421 if (_items[i] != NULL) { 422 memcpy(cp_tmp, _items[i], lengths[i]); 423 cp_tmp += lengths[i]; 424 *cp_tmp++ = separator; 425 } 426 } 427 *--cp_tmp = '\0'; // Replace the extra separator. 428 return cp; 429} 430 431// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 432char* 433SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 434 char *cp; 435 436 assert(str != NULL, "just checking"); 437 if (path == NULL) { 438 size_t len = strlen(str) + 1; 439 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 440 memcpy(cp, str, len); // copy the trailing null 441 } else { 442 const char separator = *os::path_separator(); 443 size_t old_len = strlen(path); 444 size_t str_len = strlen(str); 445 size_t len = old_len + str_len + 2; 446 447 if (prepend) { 448 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 449 char* cp_tmp = cp; 450 memcpy(cp_tmp, str, str_len); 451 cp_tmp += str_len; 452 *cp_tmp = separator; 453 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 454 FREE_C_HEAP_ARRAY(char, path); 455 } else { 456 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 457 char* cp_tmp = cp + old_len; 458 *cp_tmp = separator; 459 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 460 } 461 } 462 return cp; 463} 464 465// Scan the directory and append any jar or zip files found to path. 466// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 467char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 468 DIR* dir = os::opendir(directory); 469 if (dir == NULL) return path; 470 471 char dir_sep[2] = { '\0', '\0' }; 472 size_t directory_len = strlen(directory); 473 const char fileSep = *os::file_separator(); 474 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 475 476 /* Scan the directory for jars/zips, appending them to path. */ 477 struct dirent *entry; 478 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 479 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 480 const char* name = entry->d_name; 481 const char* ext = name + strlen(name) - 4; 482 bool isJarOrZip = ext > name && 483 (os::file_name_strcmp(ext, ".jar") == 0 || 484 os::file_name_strcmp(ext, ".zip") == 0); 485 if (isJarOrZip) { 486 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 487 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 488 path = add_to_path(path, jarpath, false); 489 FREE_C_HEAP_ARRAY(char, jarpath); 490 } 491 } 492 FREE_C_HEAP_ARRAY(char, dbuf); 493 os::closedir(dir); 494 return path; 495} 496 497// Parses a memory size specification string. 498static bool atomull(const char *s, julong* result) { 499 julong n = 0; 500 int args_read = 0; 501 bool is_hex = false; 502 // Skip leading 0[xX] for hexadecimal 503 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) { 504 s += 2; 505 is_hex = true; 506 args_read = sscanf(s, JULONG_FORMAT_X, &n); 507 } else { 508 args_read = sscanf(s, JULONG_FORMAT, &n); 509 } 510 if (args_read != 1) { 511 return false; 512 } 513 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) { 514 s++; 515 } 516 // 4705540: illegal if more characters are found after the first non-digit 517 if (strlen(s) > 1) { 518 return false; 519 } 520 switch (*s) { 521 case 'T': case 't': 522 *result = n * G * K; 523 // Check for overflow. 524 if (*result/((julong)G * K) != n) return false; 525 return true; 526 case 'G': case 'g': 527 *result = n * G; 528 if (*result/G != n) return false; 529 return true; 530 case 'M': case 'm': 531 *result = n * M; 532 if (*result/M != n) return false; 533 return true; 534 case 'K': case 'k': 535 *result = n * K; 536 if (*result/K != n) return false; 537 return true; 538 case '\0': 539 *result = n; 540 return true; 541 default: 542 return false; 543 } 544} 545 546Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 547 if (size < min_size) return arg_too_small; 548 // Check that size will fit in a size_t (only relevant on 32-bit) 549 if (size > max_uintx) return arg_too_big; 550 return arg_in_range; 551} 552 553// Describe an argument out of range error 554void Arguments::describe_range_error(ArgsRange errcode) { 555 switch(errcode) { 556 case arg_too_big: 557 jio_fprintf(defaultStream::error_stream(), 558 "The specified size exceeds the maximum " 559 "representable size.\n"); 560 break; 561 case arg_too_small: 562 case arg_unreadable: 563 case arg_in_range: 564 // do nothing for now 565 break; 566 default: 567 ShouldNotReachHere(); 568 } 569} 570 571static bool set_bool_flag(char* name, bool value, Flag::Flags origin) { 572 return CommandLineFlags::boolAtPut(name, &value, origin); 573} 574 575static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 576 double v; 577 if (sscanf(value, "%lf", &v) != 1) { 578 return false; 579 } 580 581 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 582 return true; 583 } 584 return false; 585} 586 587static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 588 julong v; 589 intx intx_v; 590 bool is_neg = false; 591 // Check the sign first since atomull() parses only unsigned values. 592 if (*value == '-') { 593 if (!CommandLineFlags::intxAt(name, &intx_v)) { 594 return false; 595 } 596 value++; 597 is_neg = true; 598 } 599 if (!atomull(value, &v)) { 600 return false; 601 } 602 intx_v = (intx) v; 603 if (is_neg) { 604 intx_v = -intx_v; 605 } 606 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 607 return true; 608 } 609 uintx uintx_v = (uintx) v; 610 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 611 return true; 612 } 613 uint64_t uint64_t_v = (uint64_t) v; 614 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 615 return true; 616 } 617 size_t size_t_v = (size_t) v; 618 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) { 619 return true; 620 } 621 return false; 622} 623 624static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 625 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 626 // Contract: CommandLineFlags always returns a pointer that needs freeing. 627 FREE_C_HEAP_ARRAY(char, value); 628 return true; 629} 630 631static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 632 const char* old_value = ""; 633 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 634 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 635 size_t new_len = strlen(new_value); 636 const char* value; 637 char* free_this_too = NULL; 638 if (old_len == 0) { 639 value = new_value; 640 } else if (new_len == 0) { 641 value = old_value; 642 } else { 643 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 644 // each new setting adds another LINE to the switch: 645 sprintf(buf, "%s\n%s", old_value, new_value); 646 value = buf; 647 free_this_too = buf; 648 } 649 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 650 // CommandLineFlags always returns a pointer that needs freeing. 651 FREE_C_HEAP_ARRAY(char, value); 652 if (free_this_too != NULL) { 653 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 654 FREE_C_HEAP_ARRAY(char, free_this_too); 655 } 656 return true; 657} 658 659bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 660 661 // range of acceptable characters spelled out for portability reasons 662#define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 663#define BUFLEN 255 664 char name[BUFLEN+1]; 665 char dummy; 666 667 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 668 return set_bool_flag(name, false, origin); 669 } 670 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 671 return set_bool_flag(name, true, origin); 672 } 673 674 char punct; 675 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 676 const char* value = strchr(arg, '=') + 1; 677 Flag* flag = Flag::find_flag(name, strlen(name)); 678 if (flag != NULL && flag->is_ccstr()) { 679 if (flag->ccstr_accumulates()) { 680 return append_to_string_flag(name, value, origin); 681 } else { 682 if (value[0] == '\0') { 683 value = NULL; 684 } 685 return set_string_flag(name, value, origin); 686 } 687 } 688 } 689 690 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 691 const char* value = strchr(arg, '=') + 1; 692 // -XX:Foo:=xxx will reset the string flag to the given value. 693 if (value[0] == '\0') { 694 value = NULL; 695 } 696 return set_string_flag(name, value, origin); 697 } 698 699#define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 700#define SIGNED_NUMBER_RANGE "[-0123456789]" 701#define NUMBER_RANGE "[0123456789]" 702 char value[BUFLEN + 1]; 703 char value2[BUFLEN + 1]; 704 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 705 // Looks like a floating-point number -- try again with more lenient format string 706 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 707 return set_fp_numeric_flag(name, value, origin); 708 } 709 } 710 711#define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 712 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 713 return set_numeric_flag(name, value, origin); 714 } 715 716 return false; 717} 718 719void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 720 assert(bldarray != NULL, "illegal argument"); 721 722 if (arg == NULL) { 723 return; 724 } 725 726 int new_count = *count + 1; 727 728 // expand the array and add arg to the last element 729 if (*bldarray == NULL) { 730 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 731 } else { 732 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 733 } 734 (*bldarray)[*count] = os::strdup_check_oom(arg); 735 *count = new_count; 736} 737 738void Arguments::build_jvm_args(const char* arg) { 739 add_string(&_jvm_args_array, &_num_jvm_args, arg); 740} 741 742void Arguments::build_jvm_flags(const char* arg) { 743 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 744} 745 746// utility function to return a string that concatenates all 747// strings in a given char** array 748const char* Arguments::build_resource_string(char** args, int count) { 749 if (args == NULL || count == 0) { 750 return NULL; 751 } 752 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 753 for (int i = 1; i < count; i++) { 754 length += strlen(args[i]) + 1; // add 1 for a space 755 } 756 char* s = NEW_RESOURCE_ARRAY(char, length); 757 strcpy(s, args[0]); 758 for (int j = 1; j < count; j++) { 759 strcat(s, " "); 760 strcat(s, args[j]); 761 } 762 return (const char*) s; 763} 764 765void Arguments::print_on(outputStream* st) { 766 st->print_cr("VM Arguments:"); 767 if (num_jvm_flags() > 0) { 768 st->print("jvm_flags: "); print_jvm_flags_on(st); 769 } 770 if (num_jvm_args() > 0) { 771 st->print("jvm_args: "); print_jvm_args_on(st); 772 } 773 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 774 if (_java_class_path != NULL) { 775 char* path = _java_class_path->value(); 776 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 777 } 778 st->print_cr("Launcher Type: %s", _sun_java_launcher); 779} 780 781void Arguments::print_jvm_flags_on(outputStream* st) { 782 if (_num_jvm_flags > 0) { 783 for (int i=0; i < _num_jvm_flags; i++) { 784 st->print("%s ", _jvm_flags_array[i]); 785 } 786 st->cr(); 787 } 788} 789 790void Arguments::print_jvm_args_on(outputStream* st) { 791 if (_num_jvm_args > 0) { 792 for (int i=0; i < _num_jvm_args; i++) { 793 st->print("%s ", _jvm_args_array[i]); 794 } 795 st->cr(); 796 } 797} 798 799bool Arguments::process_argument(const char* arg, 800 jboolean ignore_unrecognized, Flag::Flags origin) { 801 802 JDK_Version since = JDK_Version(); 803 804 if (parse_argument(arg, origin) || ignore_unrecognized) { 805 return true; 806 } 807 808 // Determine if the flag has '+', '-', or '=' characters. 809 bool has_plus_minus = (*arg == '+' || *arg == '-'); 810 const char* const argname = has_plus_minus ? arg + 1 : arg; 811 812 size_t arg_len; 813 const char* equal_sign = strchr(argname, '='); 814 if (equal_sign == NULL) { 815 arg_len = strlen(argname); 816 } else { 817 arg_len = equal_sign - argname; 818 } 819 820 // Construct a string which consists only of the argument name without '+', '-', or '='. 821 char stripped_argname[256]; 822 strncpy(stripped_argname, argname, arg_len); 823 stripped_argname[arg_len] = '\0'; //strncpy doesn't null terminate. 824 825 if (is_newly_obsolete(stripped_argname, &since)) { 826 char version[256]; 827 since.to_string(version, sizeof(version)); 828 warning("ignoring option %s; support was removed in %s", stripped_argname, version); 829 return true; 830 } 831 832 // For locked flags, report a custom error message if available. 833 // Otherwise, report the standard unrecognized VM option. 834 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 835 if (found_flag != NULL) { 836 char locked_message_buf[BUFLEN]; 837 found_flag->get_locked_message(locked_message_buf, BUFLEN); 838 if (strlen(locked_message_buf) == 0) { 839 if (found_flag->is_bool() && !has_plus_minus) { 840 jio_fprintf(defaultStream::error_stream(), 841 "Missing +/- setting for VM option '%s'\n", argname); 842 } else if (!found_flag->is_bool() && has_plus_minus) { 843 jio_fprintf(defaultStream::error_stream(), 844 "Unexpected +/- setting in VM option '%s'\n", argname); 845 } else { 846 jio_fprintf(defaultStream::error_stream(), 847 "Improperly specified VM option '%s'\n", argname); 848 } 849 } else { 850 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 851 } 852 } else { 853 jio_fprintf(defaultStream::error_stream(), 854 "Unrecognized VM option '%s'\n", argname); 855 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 856 if (fuzzy_matched != NULL) { 857 jio_fprintf(defaultStream::error_stream(), 858 "Did you mean '%s%s%s'? ", 859 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 860 fuzzy_matched->_name, 861 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 862 } 863 } 864 865 // allow for commandline "commenting out" options like -XX:#+Verbose 866 return arg[0] == '#'; 867} 868 869bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 870 FILE* stream = fopen(file_name, "rb"); 871 if (stream == NULL) { 872 if (should_exist) { 873 jio_fprintf(defaultStream::error_stream(), 874 "Could not open settings file %s\n", file_name); 875 return false; 876 } else { 877 return true; 878 } 879 } 880 881 char token[1024]; 882 int pos = 0; 883 884 bool in_white_space = true; 885 bool in_comment = false; 886 bool in_quote = false; 887 char quote_c = 0; 888 bool result = true; 889 890 int c = getc(stream); 891 while(c != EOF && pos < (int)(sizeof(token)-1)) { 892 if (in_white_space) { 893 if (in_comment) { 894 if (c == '\n') in_comment = false; 895 } else { 896 if (c == '#') in_comment = true; 897 else if (!isspace(c)) { 898 in_white_space = false; 899 token[pos++] = c; 900 } 901 } 902 } else { 903 if (c == '\n' || (!in_quote && isspace(c))) { 904 // token ends at newline, or at unquoted whitespace 905 // this allows a way to include spaces in string-valued options 906 token[pos] = '\0'; 907 logOption(token); 908 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 909 build_jvm_flags(token); 910 pos = 0; 911 in_white_space = true; 912 in_quote = false; 913 } else if (!in_quote && (c == '\'' || c == '"')) { 914 in_quote = true; 915 quote_c = c; 916 } else if (in_quote && (c == quote_c)) { 917 in_quote = false; 918 } else { 919 token[pos++] = c; 920 } 921 } 922 c = getc(stream); 923 } 924 if (pos > 0) { 925 token[pos] = '\0'; 926 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 927 build_jvm_flags(token); 928 } 929 fclose(stream); 930 return result; 931} 932 933//============================================================================================================= 934// Parsing of properties (-D) 935 936const char* Arguments::get_property(const char* key) { 937 return PropertyList_get_value(system_properties(), key); 938} 939 940bool Arguments::add_property(const char* prop) { 941 const char* eq = strchr(prop, '='); 942 char* key; 943 // ns must be static--its address may be stored in a SystemProperty object. 944 const static char ns[1] = {0}; 945 char* value = (char *)ns; 946 947 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 948 key = AllocateHeap(key_len + 1, mtInternal); 949 strncpy(key, prop, key_len); 950 key[key_len] = '\0'; 951 952 if (eq != NULL) { 953 size_t value_len = strlen(prop) - key_len - 1; 954 value = AllocateHeap(value_len + 1, mtInternal); 955 strncpy(value, &prop[key_len + 1], value_len + 1); 956 } 957 958 if (strcmp(key, "java.compiler") == 0) { 959 process_java_compiler_argument(value); 960 FreeHeap(key); 961 if (eq != NULL) { 962 FreeHeap(value); 963 } 964 return true; 965 } else if (strcmp(key, "sun.java.command") == 0) { 966 _java_command = value; 967 968 // Record value in Arguments, but let it get passed to Java. 969 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 970 strcmp(key, "sun.java.launcher.pid") == 0) { 971 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 972 // private and are processed in process_sun_java_launcher_properties(); 973 // the sun.java.launcher property is passed on to the java application 974 FreeHeap(key); 975 if (eq != NULL) { 976 FreeHeap(value); 977 } 978 return true; 979 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 980 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 981 // its value without going through the property list or making a Java call. 982 _java_vendor_url_bug = value; 983 } else if (strcmp(key, "sun.boot.library.path") == 0) { 984 PropertyList_unique_add(&_system_properties, key, value, true); 985 return true; 986 } 987 // Create new property and add at the end of the list 988 PropertyList_unique_add(&_system_properties, key, value); 989 return true; 990} 991 992//=========================================================================================================== 993// Setting int/mixed/comp mode flags 994 995void Arguments::set_mode_flags(Mode mode) { 996 // Set up default values for all flags. 997 // If you add a flag to any of the branches below, 998 // add a default value for it here. 999 set_java_compiler(false); 1000 _mode = mode; 1001 1002 // Ensure Agent_OnLoad has the correct initial values. 1003 // This may not be the final mode; mode may change later in onload phase. 1004 PropertyList_unique_add(&_system_properties, "java.vm.info", 1005 (char*)VM_Version::vm_info_string(), false); 1006 1007 UseInterpreter = true; 1008 UseCompiler = true; 1009 UseLoopCounter = true; 1010 1011 // Default values may be platform/compiler dependent - 1012 // use the saved values 1013 ClipInlining = Arguments::_ClipInlining; 1014 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1015 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1016 BackgroundCompilation = Arguments::_BackgroundCompilation; 1017 if (TieredCompilation) { 1018 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1019 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1020 } 1021 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1022 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1023 } 1024 } 1025 1026 // Change from defaults based on mode 1027 switch (mode) { 1028 default: 1029 ShouldNotReachHere(); 1030 break; 1031 case _int: 1032 UseCompiler = false; 1033 UseLoopCounter = false; 1034 AlwaysCompileLoopMethods = false; 1035 UseOnStackReplacement = false; 1036 break; 1037 case _mixed: 1038 // same as default 1039 break; 1040 case _comp: 1041 UseInterpreter = false; 1042 BackgroundCompilation = false; 1043 ClipInlining = false; 1044 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1045 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1046 // compile a level 4 (C2) and then continue executing it. 1047 if (TieredCompilation) { 1048 Tier3InvokeNotifyFreqLog = 0; 1049 Tier4InvocationThreshold = 0; 1050 } 1051 break; 1052 } 1053} 1054 1055#if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1056// Conflict: required to use shared spaces (-Xshare:on), but 1057// incompatible command line options were chosen. 1058 1059static void no_shared_spaces(const char* message) { 1060 if (RequireSharedSpaces) { 1061 jio_fprintf(defaultStream::error_stream(), 1062 "Class data sharing is inconsistent with other specified options.\n"); 1063 vm_exit_during_initialization("Unable to use shared archive.", message); 1064 } else { 1065 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1066 } 1067} 1068#endif 1069 1070// Returns threshold scaled with the value of scale. 1071// If scale < 0.0, threshold is returned without scaling. 1072intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1073 if (scale == 1.0 || scale < 0.0) { 1074 return threshold; 1075 } else { 1076 return (intx)(threshold * scale); 1077 } 1078} 1079 1080// Returns freq_log scaled with the value of scale. 1081// Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1082// If scale < 0.0, freq_log is returned without scaling. 1083intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1084 // Check if scaling is necessary or if negative value was specified. 1085 if (scale == 1.0 || scale < 0.0) { 1086 return freq_log; 1087 } 1088 // Check values to avoid calculating log2 of 0. 1089 if (scale == 0.0 || freq_log == 0) { 1090 return 0; 1091 } 1092 // Determine the maximum notification frequency value currently supported. 1093 // The largest mask value that the interpreter/C1 can handle is 1094 // of length InvocationCounter::number_of_count_bits. Mask values are always 1095 // one bit shorter then the value of the notification frequency. Set 1096 // max_freq_bits accordingly. 1097 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1098 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1099 if (scaled_freq == 0) { 1100 // Return 0 right away to avoid calculating log2 of 0. 1101 return 0; 1102 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1103 return max_freq_bits; 1104 } else { 1105 return log2_intptr(scaled_freq); 1106 } 1107} 1108 1109void Arguments::set_tiered_flags() { 1110 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1111 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1112 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1113 } 1114 if (CompilationPolicyChoice < 2) { 1115 vm_exit_during_initialization( 1116 "Incompatible compilation policy selected", NULL); 1117 } 1118 // Increase the code cache size - tiered compiles a lot more. 1119 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1120 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1121 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1122 } 1123 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1124 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1125 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1126 1127 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1128 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap) 1129 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) { 1130 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1131 } 1132 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) { 1133 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1134 } 1135 // Check consistency of code heap sizes 1136 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 1137 jio_fprintf(defaultStream::error_stream(), 1138 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 1139 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 1140 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 1141 vm_exit(1); 1142 } 1143 } 1144 } 1145 if (!UseInterpreter) { // -Xcomp 1146 Tier3InvokeNotifyFreqLog = 0; 1147 Tier4InvocationThreshold = 0; 1148 } 1149 1150 if (CompileThresholdScaling < 0) { 1151 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1152 } 1153 1154 // Scale tiered compilation thresholds. 1155 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1156 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1157 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1158 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1159 1160 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1161 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1162 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1163 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1164 1165 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1166 // once these thresholds become supported. 1167 1168 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1169 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1170 1171 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1172 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1173 1174 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1175 1176 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1177 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1178 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1179 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1180 } 1181} 1182 1183/** 1184 * Returns the minimum number of compiler threads needed to run the JVM. The following 1185 * configurations are possible. 1186 * 1187 * 1) The JVM is build using an interpreter only. As a result, the minimum number of 1188 * compiler threads is 0. 1189 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As 1190 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1. 1191 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However, 1192 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only 1193 * C1 can be used, so the minimum number of compiler threads is 1. 1194 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option 1195 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result, 1196 * the minimum number of compiler threads is 2. 1197 */ 1198int Arguments::get_min_number_of_compiler_threads() { 1199#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 1200 return 0; // case 1 1201#else 1202 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) { 1203 return 1; // case 2 or case 3 1204 } 1205 return 2; // case 4 (tiered) 1206#endif 1207} 1208 1209#if INCLUDE_ALL_GCS 1210static void disable_adaptive_size_policy(const char* collector_name) { 1211 if (UseAdaptiveSizePolicy) { 1212 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1213 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1214 collector_name); 1215 } 1216 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1217 } 1218} 1219 1220void Arguments::set_parnew_gc_flags() { 1221 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1222 "control point invariant"); 1223 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1224 assert(UseParNewGC, "ParNew should always be used with CMS"); 1225 1226 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1227 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1228 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1229 } else if (ParallelGCThreads == 0) { 1230 jio_fprintf(defaultStream::error_stream(), 1231 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1232 vm_exit(1); 1233 } 1234 1235 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1236 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1237 // we set them to 1024 and 1024. 1238 // See CR 6362902. 1239 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1240 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1241 } 1242 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1243 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1244 } 1245 1246 // When using compressed oops, we use local overflow stacks, 1247 // rather than using a global overflow list chained through 1248 // the klass word of the object's pre-image. 1249 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1250 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1251 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1252 } 1253 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1254 } 1255 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1256} 1257 1258// Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1259// sparc/solaris for certain applications, but would gain from 1260// further optimization and tuning efforts, and would almost 1261// certainly gain from analysis of platform and environment. 1262void Arguments::set_cms_and_parnew_gc_flags() { 1263 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1264 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1265 assert(UseParNewGC, "ParNew should always be used with CMS"); 1266 1267 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1268 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1269 1270 set_parnew_gc_flags(); 1271 1272 size_t max_heap = align_size_down(MaxHeapSize, 1273 CardTableRS::ct_max_alignment_constraint()); 1274 1275 // Now make adjustments for CMS 1276 intx tenuring_default = (intx)6; 1277 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1278 1279 // Preferred young gen size for "short" pauses: 1280 // upper bound depends on # of threads and NewRatio. 1281 const uintx parallel_gc_threads = 1282 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1283 const size_t preferred_max_new_size_unaligned = 1284 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1285 size_t preferred_max_new_size = 1286 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1287 1288 // Unless explicitly requested otherwise, size young gen 1289 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1290 1291 // If either MaxNewSize or NewRatio is set on the command line, 1292 // assume the user is trying to set the size of the young gen. 1293 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1294 1295 // Set MaxNewSize to our calculated preferred_max_new_size unless 1296 // NewSize was set on the command line and it is larger than 1297 // preferred_max_new_size. 1298 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1299 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1300 } else { 1301 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size); 1302 } 1303 if (PrintGCDetails && Verbose) { 1304 // Too early to use gclog_or_tty 1305 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1306 } 1307 1308 // Code along this path potentially sets NewSize and OldSize 1309 if (PrintGCDetails && Verbose) { 1310 // Too early to use gclog_or_tty 1311 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1312 " initial_heap_size: " SIZE_FORMAT 1313 " max_heap: " SIZE_FORMAT, 1314 min_heap_size(), InitialHeapSize, max_heap); 1315 } 1316 size_t min_new = preferred_max_new_size; 1317 if (FLAG_IS_CMDLINE(NewSize)) { 1318 min_new = NewSize; 1319 } 1320 if (max_heap > min_new && min_heap_size() > min_new) { 1321 // Unless explicitly requested otherwise, make young gen 1322 // at least min_new, and at most preferred_max_new_size. 1323 if (FLAG_IS_DEFAULT(NewSize)) { 1324 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new)); 1325 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize)); 1326 if (PrintGCDetails && Verbose) { 1327 // Too early to use gclog_or_tty 1328 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1329 } 1330 } 1331 // Unless explicitly requested otherwise, size old gen 1332 // so it's NewRatio x of NewSize. 1333 if (FLAG_IS_DEFAULT(OldSize)) { 1334 if (max_heap > NewSize) { 1335 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1336 if (PrintGCDetails && Verbose) { 1337 // Too early to use gclog_or_tty 1338 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1339 } 1340 } 1341 } 1342 } 1343 } 1344 // Unless explicitly requested otherwise, definitely 1345 // promote all objects surviving "tenuring_default" scavenges. 1346 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1347 FLAG_IS_DEFAULT(SurvivorRatio)) { 1348 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1349 } 1350 // If we decided above (or user explicitly requested) 1351 // `promote all' (via MaxTenuringThreshold := 0), 1352 // prefer minuscule survivor spaces so as not to waste 1353 // space for (non-existent) survivors 1354 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1355 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1356 } 1357 1358 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1359 // but rather the number of free blocks of a given size that are used when 1360 // replenishing the local per-worker free list caches. 1361 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1362 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1363 // OldPLAB sizing manually turned off: Use a larger default setting, 1364 // unless it was manually specified. This is because a too-low value 1365 // will slow down scavenges. 1366 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166 1367 } else { 1368 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1369 } 1370 } 1371 1372 // If either of the static initialization defaults have changed, note this 1373 // modification. 1374 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1375 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1376 } 1377 if (PrintGCDetails && Verbose) { 1378 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1379 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1380 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1381 } 1382} 1383#endif // INCLUDE_ALL_GCS 1384 1385void set_object_alignment() { 1386 // Object alignment. 1387 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1388 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1389 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1390 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1391 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1392 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1393 1394 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1395 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1396 1397 // Oop encoding heap max 1398 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1399 1400#if INCLUDE_ALL_GCS 1401 // Set CMS global values 1402 CompactibleFreeListSpace::set_cms_values(); 1403#endif // INCLUDE_ALL_GCS 1404} 1405 1406bool verify_object_alignment() { 1407 // Object alignment. 1408 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1409 jio_fprintf(defaultStream::error_stream(), 1410 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1411 (int)ObjectAlignmentInBytes); 1412 return false; 1413 } 1414 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1415 jio_fprintf(defaultStream::error_stream(), 1416 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1417 (int)ObjectAlignmentInBytes, BytesPerLong); 1418 return false; 1419 } 1420 // It does not make sense to have big object alignment 1421 // since a space lost due to alignment will be greater 1422 // then a saved space from compressed oops. 1423 if ((int)ObjectAlignmentInBytes > 256) { 1424 jio_fprintf(defaultStream::error_stream(), 1425 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1426 (int)ObjectAlignmentInBytes); 1427 return false; 1428 } 1429 // In case page size is very small. 1430 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1431 jio_fprintf(defaultStream::error_stream(), 1432 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1433 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1434 return false; 1435 } 1436 if(SurvivorAlignmentInBytes == 0) { 1437 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1438 } else { 1439 if (!is_power_of_2(SurvivorAlignmentInBytes)) { 1440 jio_fprintf(defaultStream::error_stream(), 1441 "error: SurvivorAlignmentInBytes=%d must be power of 2\n", 1442 (int)SurvivorAlignmentInBytes); 1443 return false; 1444 } 1445 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) { 1446 jio_fprintf(defaultStream::error_stream(), 1447 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n", 1448 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes); 1449 return false; 1450 } 1451 } 1452 return true; 1453} 1454 1455size_t Arguments::max_heap_for_compressed_oops() { 1456 // Avoid sign flip. 1457 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1458 // We need to fit both the NULL page and the heap into the memory budget, while 1459 // keeping alignment constraints of the heap. To guarantee the latter, as the 1460 // NULL page is located before the heap, we pad the NULL page to the conservative 1461 // maximum alignment that the GC may ever impose upon the heap. 1462 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1463 _conservative_max_heap_alignment); 1464 1465 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1466 NOT_LP64(ShouldNotReachHere(); return 0); 1467} 1468 1469bool Arguments::should_auto_select_low_pause_collector() { 1470 if (UseAutoGCSelectPolicy && 1471 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1472 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1473 if (PrintGCDetails) { 1474 // Cannot use gclog_or_tty yet. 1475 tty->print_cr("Automatic selection of the low pause collector" 1476 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1477 } 1478 return true; 1479 } 1480 return false; 1481} 1482 1483void Arguments::set_use_compressed_oops() { 1484#ifndef ZERO 1485#ifdef _LP64 1486 // MaxHeapSize is not set up properly at this point, but 1487 // the only value that can override MaxHeapSize if we are 1488 // to use UseCompressedOops is InitialHeapSize. 1489 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1490 1491 if (max_heap_size <= max_heap_for_compressed_oops()) { 1492#if !defined(COMPILER1) || defined(TIERED) 1493 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1494 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1495 } 1496#endif 1497 } else { 1498 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1499 warning("Max heap size too large for Compressed Oops"); 1500 FLAG_SET_DEFAULT(UseCompressedOops, false); 1501 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1502 } 1503 } 1504#endif // _LP64 1505#endif // ZERO 1506} 1507 1508 1509// NOTE: set_use_compressed_klass_ptrs() must be called after calling 1510// set_use_compressed_oops(). 1511void Arguments::set_use_compressed_klass_ptrs() { 1512#ifndef ZERO 1513#ifdef _LP64 1514 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1515 if (!UseCompressedOops) { 1516 if (UseCompressedClassPointers) { 1517 warning("UseCompressedClassPointers requires UseCompressedOops"); 1518 } 1519 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1520 } else { 1521 // Turn on UseCompressedClassPointers too 1522 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1523 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1524 } 1525 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1526 if (UseCompressedClassPointers) { 1527 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1528 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1529 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1530 } 1531 } 1532 } 1533#endif // _LP64 1534#endif // !ZERO 1535} 1536 1537void Arguments::set_conservative_max_heap_alignment() { 1538 // The conservative maximum required alignment for the heap is the maximum of 1539 // the alignments imposed by several sources: any requirements from the heap 1540 // itself, the collector policy and the maximum page size we may run the VM 1541 // with. 1542 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1543#if INCLUDE_ALL_GCS 1544 if (UseParallelGC) { 1545 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1546 } else if (UseG1GC) { 1547 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1548 } 1549#endif // INCLUDE_ALL_GCS 1550 _conservative_max_heap_alignment = MAX4(heap_alignment, 1551 (size_t)os::vm_allocation_granularity(), 1552 os::max_page_size(), 1553 CollectorPolicy::compute_heap_alignment()); 1554} 1555 1556void Arguments::select_gc_ergonomically() { 1557 if (os::is_server_class_machine()) { 1558 if (should_auto_select_low_pause_collector()) { 1559 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1560 } else { 1561 FLAG_SET_ERGO(bool, UseParallelGC, true); 1562 } 1563 } 1564} 1565 1566void Arguments::select_gc() { 1567 if (!gc_selected()) { 1568 select_gc_ergonomically(); 1569 } 1570} 1571 1572void Arguments::set_ergonomics_flags() { 1573 select_gc(); 1574 1575#ifdef COMPILER2 1576 // Shared spaces work fine with other GCs but causes bytecode rewriting 1577 // to be disabled, which hurts interpreter performance and decreases 1578 // server performance. When -server is specified, keep the default off 1579 // unless it is asked for. Future work: either add bytecode rewriting 1580 // at link time, or rewrite bytecodes in non-shared methods. 1581 if (!DumpSharedSpaces && !RequireSharedSpaces && 1582 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1583 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1584 } 1585#endif 1586 1587 set_conservative_max_heap_alignment(); 1588 1589#ifndef ZERO 1590#ifdef _LP64 1591 set_use_compressed_oops(); 1592 1593 // set_use_compressed_klass_ptrs() must be called after calling 1594 // set_use_compressed_oops(). 1595 set_use_compressed_klass_ptrs(); 1596 1597 // Also checks that certain machines are slower with compressed oops 1598 // in vm_version initialization code. 1599#endif // _LP64 1600#endif // !ZERO 1601} 1602 1603void Arguments::set_parallel_gc_flags() { 1604 assert(UseParallelGC || UseParallelOldGC, "Error"); 1605 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1606 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1607 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1608 } 1609 FLAG_SET_DEFAULT(UseParallelGC, true); 1610 1611 // If no heap maximum was requested explicitly, use some reasonable fraction 1612 // of the physical memory, up to a maximum of 1GB. 1613 FLAG_SET_DEFAULT(ParallelGCThreads, 1614 Abstract_VM_Version::parallel_worker_threads()); 1615 if (ParallelGCThreads == 0) { 1616 jio_fprintf(defaultStream::error_stream(), 1617 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1618 vm_exit(1); 1619 } 1620 1621 if (UseAdaptiveSizePolicy) { 1622 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1623 // unless the user actually sets these flags. 1624 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1625 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1626 _min_heap_free_ratio = MinHeapFreeRatio; 1627 } 1628 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1629 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1630 _max_heap_free_ratio = MaxHeapFreeRatio; 1631 } 1632 } 1633 1634 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1635 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1636 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1637 // See CR 6362902 for details. 1638 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1639 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1640 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1641 } 1642 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1643 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1644 } 1645 } 1646 1647 if (UseParallelOldGC) { 1648 // Par compact uses lower default values since they are treated as 1649 // minimums. These are different defaults because of the different 1650 // interpretation and are not ergonomically set. 1651 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1652 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1653 } 1654 } 1655} 1656 1657void Arguments::set_g1_gc_flags() { 1658 assert(UseG1GC, "Error"); 1659#ifdef COMPILER1 1660 FastTLABRefill = false; 1661#endif 1662 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1663 if (ParallelGCThreads == 0) { 1664 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1665 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1666 } 1667 1668#if INCLUDE_ALL_GCS 1669 if (G1ConcRefinementThreads == 0) { 1670 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads); 1671 } 1672#endif 1673 1674 // MarkStackSize will be set (if it hasn't been set by the user) 1675 // when concurrent marking is initialized. 1676 // Its value will be based upon the number of parallel marking threads. 1677 // But we do set the maximum mark stack size here. 1678 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1679 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1680 } 1681 1682 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1683 // In G1, we want the default GC overhead goal to be higher than 1684 // say in PS. So we set it here to 10%. Otherwise the heap might 1685 // be expanded more aggressively than we would like it to. In 1686 // fact, even 10% seems to not be high enough in some cases 1687 // (especially small GC stress tests that the main thing they do 1688 // is allocation). We might consider increase it further. 1689 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1690 } 1691 1692 if (PrintGCDetails && Verbose) { 1693 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1694 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1695 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1696 } 1697} 1698 1699#if !INCLUDE_ALL_GCS 1700#ifdef ASSERT 1701static bool verify_serial_gc_flags() { 1702 return (UseSerialGC && 1703 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC || 1704 UseParallelGC || UseParallelOldGC)); 1705} 1706#endif // ASSERT 1707#endif // INCLUDE_ALL_GCS 1708 1709void Arguments::set_gc_specific_flags() { 1710#if INCLUDE_ALL_GCS 1711 // Set per-collector flags 1712 if (UseParallelGC || UseParallelOldGC) { 1713 set_parallel_gc_flags(); 1714 } else if (UseConcMarkSweepGC) { 1715 set_cms_and_parnew_gc_flags(); 1716 } else if (UseG1GC) { 1717 set_g1_gc_flags(); 1718 } 1719 check_deprecated_gc_flags(); 1720 if (AssumeMP && !UseSerialGC) { 1721 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 1722 warning("If the number of processors is expected to increase from one, then" 1723 " you should configure the number of parallel GC threads appropriately" 1724 " using -XX:ParallelGCThreads=N"); 1725 } 1726 } 1727 if (MinHeapFreeRatio == 100) { 1728 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1729 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 1730 } 1731#else // INCLUDE_ALL_GCS 1732 assert(verify_serial_gc_flags(), "SerialGC unset"); 1733#endif // INCLUDE_ALL_GCS 1734} 1735 1736julong Arguments::limit_by_allocatable_memory(julong limit) { 1737 julong max_allocatable; 1738 julong result = limit; 1739 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1740 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1741 } 1742 return result; 1743} 1744 1745// Use static initialization to get the default before parsing 1746static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1747 1748void Arguments::set_heap_size() { 1749 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1750 // Deprecated flag 1751 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1752 } 1753 1754 const julong phys_mem = 1755 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1756 : (julong)MaxRAM; 1757 1758 // If the maximum heap size has not been set with -Xmx, 1759 // then set it as fraction of the size of physical memory, 1760 // respecting the maximum and minimum sizes of the heap. 1761 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1762 julong reasonable_max = phys_mem / MaxRAMFraction; 1763 1764 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1765 // Small physical memory, so use a minimum fraction of it for the heap 1766 reasonable_max = phys_mem / MinRAMFraction; 1767 } else { 1768 // Not-small physical memory, so require a heap at least 1769 // as large as MaxHeapSize 1770 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1771 } 1772 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1773 // Limit the heap size to ErgoHeapSizeLimit 1774 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1775 } 1776 if (UseCompressedOops) { 1777 // Limit the heap size to the maximum possible when using compressed oops 1778 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1779 1780 // HeapBaseMinAddress can be greater than default but not less than. 1781 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1782 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1783 // matches compressed oops printing flags 1784 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 1785 jio_fprintf(defaultStream::error_stream(), 1786 "HeapBaseMinAddress must be at least " SIZE_FORMAT 1787 " (" SIZE_FORMAT "G) which is greater than value given " 1788 SIZE_FORMAT "\n", 1789 DefaultHeapBaseMinAddress, 1790 DefaultHeapBaseMinAddress/G, 1791 HeapBaseMinAddress); 1792 } 1793 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1794 } 1795 } 1796 1797 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1798 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1799 // but it should be not less than default MaxHeapSize. 1800 max_coop_heap -= HeapBaseMinAddress; 1801 } 1802 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1803 } 1804 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1805 1806 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1807 // An initial heap size was specified on the command line, 1808 // so be sure that the maximum size is consistent. Done 1809 // after call to limit_by_allocatable_memory because that 1810 // method might reduce the allocation size. 1811 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1812 } 1813 1814 if (PrintGCDetails && Verbose) { 1815 // Cannot use gclog_or_tty yet. 1816 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1817 } 1818 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 1819 } 1820 1821 // If the minimum or initial heap_size have not been set or requested to be set 1822 // ergonomically, set them accordingly. 1823 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1824 julong reasonable_minimum = (julong)(OldSize + NewSize); 1825 1826 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1827 1828 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1829 1830 if (InitialHeapSize == 0) { 1831 julong reasonable_initial = phys_mem / InitialRAMFraction; 1832 1833 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1834 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1835 1836 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1837 1838 if (PrintGCDetails && Verbose) { 1839 // Cannot use gclog_or_tty yet. 1840 tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 1841 } 1842 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 1843 } 1844 // If the minimum heap size has not been set (via -Xms), 1845 // synchronize with InitialHeapSize to avoid errors with the default value. 1846 if (min_heap_size() == 0) { 1847 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1848 if (PrintGCDetails && Verbose) { 1849 // Cannot use gclog_or_tty yet. 1850 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1851 } 1852 } 1853 } 1854} 1855 1856// This must be called after ergonomics. 1857void Arguments::set_bytecode_flags() { 1858 if (!RewriteBytecodes) { 1859 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1860 } 1861} 1862 1863// Aggressive optimization flags -XX:+AggressiveOpts 1864void Arguments::set_aggressive_opts_flags() { 1865#ifdef COMPILER2 1866 if (AggressiveUnboxing) { 1867 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1868 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1869 } else if (!EliminateAutoBox) { 1870 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1871 AggressiveUnboxing = false; 1872 } 1873 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1874 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1875 } else if (!DoEscapeAnalysis) { 1876 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1877 AggressiveUnboxing = false; 1878 } 1879 } 1880 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1881 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1882 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1883 } 1884 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1885 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1886 } 1887 1888 // Feed the cache size setting into the JDK 1889 char buffer[1024]; 1890 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1891 add_property(buffer); 1892 } 1893 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1894 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1895 } 1896#endif 1897 1898 if (AggressiveOpts) { 1899// Sample flag setting code 1900// if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1901// FLAG_SET_DEFAULT(EliminateZeroing, true); 1902// } 1903 } 1904} 1905 1906//=========================================================================================================== 1907// Parsing of java.compiler property 1908 1909void Arguments::process_java_compiler_argument(char* arg) { 1910 // For backwards compatibility, Djava.compiler=NONE or "" 1911 // causes us to switch to -Xint mode UNLESS -Xdebug 1912 // is also specified. 1913 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1914 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1915 } 1916} 1917 1918void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1919 _sun_java_launcher = os::strdup_check_oom(launcher); 1920} 1921 1922bool Arguments::created_by_java_launcher() { 1923 assert(_sun_java_launcher != NULL, "property must have value"); 1924 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1925} 1926 1927bool Arguments::sun_java_launcher_is_altjvm() { 1928 return _sun_java_launcher_is_altjvm; 1929} 1930 1931//=========================================================================================================== 1932// Parsing of main arguments 1933 1934bool Arguments::verify_interval(uintx val, uintx min, 1935 uintx max, const char* name) { 1936 // Returns true iff value is in the inclusive interval [min..max] 1937 // false, otherwise. 1938 if (val >= min && val <= max) { 1939 return true; 1940 } 1941 jio_fprintf(defaultStream::error_stream(), 1942 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1943 " and " UINTX_FORMAT "\n", 1944 name, val, min, max); 1945 return false; 1946} 1947 1948bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1949 // Returns true if given value is at least specified min threshold 1950 // false, otherwise. 1951 if (val >= min ) { 1952 return true; 1953 } 1954 jio_fprintf(defaultStream::error_stream(), 1955 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1956 name, val, min); 1957 return false; 1958} 1959 1960bool Arguments::verify_percentage(uintx value, const char* name) { 1961 if (is_percentage(value)) { 1962 return true; 1963 } 1964 jio_fprintf(defaultStream::error_stream(), 1965 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1966 name, value); 1967 return false; 1968} 1969 1970// check if do gclog rotation 1971// +UseGCLogFileRotation is a must, 1972// no gc log rotation when log file not supplied or 1973// NumberOfGCLogFiles is 0 1974void check_gclog_consistency() { 1975 if (UseGCLogFileRotation) { 1976 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { 1977 jio_fprintf(defaultStream::output_stream(), 1978 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" 1979 "where num_of_file > 0\n" 1980 "GC log rotation is turned off\n"); 1981 UseGCLogFileRotation = false; 1982 } 1983 } 1984 1985 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { 1986 FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K); 1987 jio_fprintf(defaultStream::output_stream(), 1988 "GCLogFileSize changed to minimum 8K\n"); 1989 } 1990} 1991 1992// This function is called for -Xloggc:<filename>, it can be used 1993// to check if a given file name(or string) conforms to the following 1994// specification: 1995// A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 1996// %p and %t only allowed once. We only limit usage of filename not path 1997bool is_filename_valid(const char *file_name) { 1998 const char* p = file_name; 1999 char file_sep = os::file_separator()[0]; 2000 const char* cp; 2001 // skip prefix path 2002 for (cp = file_name; *cp != '\0'; cp++) { 2003 if (*cp == '/' || *cp == file_sep) { 2004 p = cp + 1; 2005 } 2006 } 2007 2008 int count_p = 0; 2009 int count_t = 0; 2010 while (*p != '\0') { 2011 if ((*p >= '0' && *p <= '9') || 2012 (*p >= 'A' && *p <= 'Z') || 2013 (*p >= 'a' && *p <= 'z') || 2014 *p == '-' || 2015 *p == '_' || 2016 *p == '.') { 2017 p++; 2018 continue; 2019 } 2020 if (*p == '%') { 2021 if(*(p + 1) == 'p') { 2022 p += 2; 2023 count_p ++; 2024 continue; 2025 } 2026 if (*(p + 1) == 't') { 2027 p += 2; 2028 count_t ++; 2029 continue; 2030 } 2031 } 2032 return false; 2033 } 2034 return count_p < 2 && count_t < 2; 2035} 2036 2037bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) { 2038 if (!is_percentage(min_heap_free_ratio)) { 2039 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100"); 2040 return false; 2041 } 2042 if (min_heap_free_ratio > MaxHeapFreeRatio) { 2043 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 2044 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio, 2045 MaxHeapFreeRatio); 2046 return false; 2047 } 2048 // This does not set the flag itself, but stores the value in a safe place for later usage. 2049 _min_heap_free_ratio = min_heap_free_ratio; 2050 return true; 2051} 2052 2053bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) { 2054 if (!is_percentage(max_heap_free_ratio)) { 2055 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100"); 2056 return false; 2057 } 2058 if (max_heap_free_ratio < MinHeapFreeRatio) { 2059 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or " 2060 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio, 2061 MinHeapFreeRatio); 2062 return false; 2063 } 2064 // This does not set the flag itself, but stores the value in a safe place for later usage. 2065 _max_heap_free_ratio = max_heap_free_ratio; 2066 return true; 2067} 2068 2069// Check consistency of GC selection 2070bool Arguments::check_gc_consistency() { 2071 check_gclog_consistency(); 2072 // Ensure that the user has not selected conflicting sets 2073 // of collectors. 2074 uint i = 0; 2075 if (UseSerialGC) i++; 2076 if (UseConcMarkSweepGC) i++; 2077 if (UseParallelGC || UseParallelOldGC) i++; 2078 if (UseG1GC) i++; 2079 if (i > 1) { 2080 jio_fprintf(defaultStream::error_stream(), 2081 "Conflicting collector combinations in option list; " 2082 "please refer to the release notes for the combinations " 2083 "allowed\n"); 2084 return false; 2085 } 2086 2087 if (UseConcMarkSweepGC && !UseParNewGC) { 2088 jio_fprintf(defaultStream::error_stream(), 2089 "It is not possible to combine the DefNew young collector with the CMS collector.\n"); 2090 return false; 2091 } 2092 2093 if (UseParNewGC && !UseConcMarkSweepGC) { 2094 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 2095 // set up UseSerialGC properly, so that can't be used in the check here. 2096 jio_fprintf(defaultStream::error_stream(), 2097 "It is not possible to combine the ParNew young collector with the Serial old collector.\n"); 2098 return false; 2099 } 2100 2101 return true; 2102} 2103 2104void Arguments::check_deprecated_gc_flags() { 2105 if (FLAG_IS_CMDLINE(UseParNewGC)) { 2106 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release"); 2107 } 2108 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 2109 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 2110 "and will likely be removed in future release"); 2111 } 2112 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 2113 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 2114 "Use MaxRAMFraction instead."); 2115 } 2116} 2117 2118// Check stack pages settings 2119bool Arguments::check_stack_pages() 2120{ 2121 bool status = true; 2122 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 2123 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 2124 // greater stack shadow pages can't generate instruction to bang stack 2125 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 2126 return status; 2127} 2128 2129// Check the consistency of vm_init_args 2130bool Arguments::check_vm_args_consistency() { 2131 // Method for adding checks for flag consistency. 2132 // The intent is to warn the user of all possible conflicts, 2133 // before returning an error. 2134 // Note: Needs platform-dependent factoring. 2135 bool status = true; 2136 2137 if (TLABRefillWasteFraction == 0) { 2138 jio_fprintf(defaultStream::error_stream(), 2139 "TLABRefillWasteFraction should be a denominator, " 2140 "not " SIZE_FORMAT "\n", 2141 TLABRefillWasteFraction); 2142 status = false; 2143 } 2144 2145 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 2146 "AdaptiveSizePolicyWeight"); 2147 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 2148 2149 // Divide by bucket size to prevent a large size from causing rollover when 2150 // calculating amount of memory needed to be allocated for the String table. 2151 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2152 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2153 2154 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize, 2155 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size"); 2156 2157 { 2158 // Using "else if" below to avoid printing two error messages if min > max. 2159 // This will also prevent us from reporting both min>100 and max>100 at the 2160 // same time, but that is less annoying than printing two identical errors IMHO. 2161 FormatBuffer<80> err_msg("%s",""); 2162 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) { 2163 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2164 status = false; 2165 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) { 2166 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2167 status = false; 2168 } 2169 } 2170 2171 // Min/MaxMetaspaceFreeRatio 2172 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2173 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2174 2175 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2176 jio_fprintf(defaultStream::error_stream(), 2177 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2178 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2179 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2180 MinMetaspaceFreeRatio, 2181 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2182 MaxMetaspaceFreeRatio); 2183 status = false; 2184 } 2185 2186 // Trying to keep 100% free is not practical 2187 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2188 2189 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2190 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2191 } 2192 2193 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2194 // Settings to encourage splitting. 2195 if (!FLAG_IS_CMDLINE(NewRatio)) { 2196 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2197 } 2198 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2199 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2200 } 2201 } 2202 2203 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2204 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2205 } 2206 2207 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2208 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2209 if (GCTimeLimit == 100) { 2210 // Turn off gc-overhead-limit-exceeded checks 2211 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2212 } 2213 2214 status = status && check_gc_consistency(); 2215 status = status && check_stack_pages(); 2216 2217 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2218 "CMSIncrementalSafetyFactor"); 2219 2220 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2221 // insists that we hold the requisite locks so that the iteration is 2222 // MT-safe. For the verification at start-up and shut-down, we don't 2223 // yet have a good way of acquiring and releasing these locks, 2224 // which are not visible at the CollectedHeap level. We want to 2225 // be able to acquire these locks and then do the iteration rather 2226 // than just disable the lock verification. This will be fixed under 2227 // bug 4788986. 2228 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2229 if (VerifyDuringStartup) { 2230 warning("Heap verification at start-up disabled " 2231 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2232 VerifyDuringStartup = false; // Disable verification at start-up 2233 } 2234 2235 if (VerifyBeforeExit) { 2236 warning("Heap verification at shutdown disabled " 2237 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2238 VerifyBeforeExit = false; // Disable verification at shutdown 2239 } 2240 } 2241 2242 // Note: only executed in non-PRODUCT mode 2243 if (!UseAsyncConcMarkSweepGC && 2244 (ExplicitGCInvokesConcurrent || 2245 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2246 jio_fprintf(defaultStream::error_stream(), 2247 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2248 " with -UseAsyncConcMarkSweepGC"); 2249 status = false; 2250 } 2251 2252 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2253 2254#if INCLUDE_ALL_GCS 2255 if (UseG1GC) { 2256 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent"); 2257 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent"); 2258 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent"); 2259 2260 status = status && verify_percentage(G1ConfidencePercent, "G1ConfidencePercent"); 2261 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2262 "InitiatingHeapOccupancyPercent"); 2263 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2264 "G1RefProcDrainInterval"); 2265 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2266 "G1ConcMarkStepDurationMillis"); 2267 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2268 "G1ConcRSHotCardLimit"); 2269 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2270 "G1ConcRSLogCacheSize"); 2271 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age, 2272 "StringDeduplicationAgeThreshold"); 2273 } 2274 if (UseConcMarkSweepGC) { 2275 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2276 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2277 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2278 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2279 2280 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2281 2282 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2283 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2284 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2285 2286 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2287 2288 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2289 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2290 2291 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2292 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2293 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2294 2295 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2296 2297 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2298 2299 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2300 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2301 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2302 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2303 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2304 } 2305 2306 if (UseParallelGC || UseParallelOldGC) { 2307 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2308 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2309 2310 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2311 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2312 2313 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2314 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2315 2316 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2317 2318 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2319 } 2320#endif // INCLUDE_ALL_GCS 2321 2322 status = status && verify_interval(RefDiscoveryPolicy, 2323 ReferenceProcessor::DiscoveryPolicyMin, 2324 ReferenceProcessor::DiscoveryPolicyMax, 2325 "RefDiscoveryPolicy"); 2326 2327 // Limit the lower bound of this flag to 1 as it is used in a division 2328 // expression. 2329 status = status && verify_interval(TLABWasteTargetPercent, 2330 1, 100, "TLABWasteTargetPercent"); 2331 2332 status = status && verify_object_alignment(); 2333 2334 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2335 "CompressedClassSpaceSize"); 2336 2337 status = status && verify_interval(MarkStackSizeMax, 2338 1, (max_jint - 1), "MarkStackSizeMax"); 2339 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2340 2341 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2342 2343 status = status && verify_min_value(HeapSizePerGCThread, (size_t) os::vm_page_size(), "HeapSizePerGCThread"); 2344 2345 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2346 2347 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2348 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2349 2350 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2351 2352 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2353 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2354 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2355 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2356 2357 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2358 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2359 2360 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2361 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2362 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2363 2364 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2365 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2366 2367 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold"); 2368 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold"); 2369 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2370 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2371 2372 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2373#ifdef COMPILER1 2374 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize"); 2375#endif 2376 status = status && verify_min_value(HeapSearchSteps, 1, "HeapSearchSteps"); 2377 2378 if (PrintNMTStatistics) { 2379#if INCLUDE_NMT 2380 if (MemTracker::tracking_level() == NMT_off) { 2381#endif // INCLUDE_NMT 2382 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2383 PrintNMTStatistics = false; 2384#if INCLUDE_NMT 2385 } 2386#endif 2387 } 2388 2389 // Need to limit the extent of the padding to reasonable size. 2390 // 8K is well beyond the reasonable HW cache line size, even with the 2391 // aggressive prefetching, while still leaving the room for segregating 2392 // among the distinct pages. 2393 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2394 jio_fprintf(defaultStream::error_stream(), 2395 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2396 ContendedPaddingWidth, 0, 8192); 2397 status = false; 2398 } 2399 2400 // Need to enforce the padding not to break the existing field alignments. 2401 // It is sufficient to check against the largest type size. 2402 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2403 jio_fprintf(defaultStream::error_stream(), 2404 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2405 ContendedPaddingWidth, BytesPerLong); 2406 status = false; 2407 } 2408 2409 // Check lower bounds of the code cache 2410 // Template Interpreter code is approximately 3X larger in debug builds. 2411 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2412 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2413 jio_fprintf(defaultStream::error_stream(), 2414 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2415 os::vm_page_size()/K); 2416 status = false; 2417 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2418 jio_fprintf(defaultStream::error_stream(), 2419 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2420 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2421 status = false; 2422 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2423 jio_fprintf(defaultStream::error_stream(), 2424 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2425 min_code_cache_size/K); 2426 status = false; 2427 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2428 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2429 jio_fprintf(defaultStream::error_stream(), 2430 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2431 CODE_CACHE_SIZE_LIMIT/M); 2432 status = false; 2433 } else if (NonNMethodCodeHeapSize < min_code_cache_size){ 2434 jio_fprintf(defaultStream::error_stream(), 2435 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2436 min_code_cache_size/K); 2437 status = false; 2438 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) 2439 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 2440 jio_fprintf(defaultStream::error_stream(), 2441 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 2442 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 2443 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 2444 status = false; 2445 } 2446 2447 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); 2448 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength"); 2449 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize"); 2450 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt"); 2451 2452 2453 int min_number_of_compiler_threads = get_min_number_of_compiler_threads(); 2454 // The default CICompilerCount's value is CI_COMPILER_COUNT. 2455 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number"); 2456 // Check the minimum number of compiler threads 2457 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount"); 2458 2459 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2460 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2461 } 2462 2463 return status; 2464} 2465 2466bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2467 const char* option_type) { 2468 if (ignore) return false; 2469 2470 const char* spacer = " "; 2471 if (option_type == NULL) { 2472 option_type = ++spacer; // Set both to the empty string. 2473 } 2474 2475 if (os::obsolete_option(option)) { 2476 jio_fprintf(defaultStream::error_stream(), 2477 "Obsolete %s%soption: %s\n", option_type, spacer, 2478 option->optionString); 2479 return false; 2480 } else { 2481 jio_fprintf(defaultStream::error_stream(), 2482 "Unrecognized %s%soption: %s\n", option_type, spacer, 2483 option->optionString); 2484 return true; 2485 } 2486} 2487 2488static const char* user_assertion_options[] = { 2489 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2490}; 2491 2492static const char* system_assertion_options[] = { 2493 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2494}; 2495 2496bool Arguments::parse_uintx(const char* value, 2497 uintx* uintx_arg, 2498 uintx min_size) { 2499 2500 // Check the sign first since atomull() parses only unsigned values. 2501 bool value_is_positive = !(*value == '-'); 2502 2503 if (value_is_positive) { 2504 julong n; 2505 bool good_return = atomull(value, &n); 2506 if (good_return) { 2507 bool above_minimum = n >= min_size; 2508 bool value_is_too_large = n > max_uintx; 2509 2510 if (above_minimum && !value_is_too_large) { 2511 *uintx_arg = n; 2512 return true; 2513 } 2514 } 2515 } 2516 return false; 2517} 2518 2519Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2520 julong* long_arg, 2521 julong min_size) { 2522 if (!atomull(s, long_arg)) return arg_unreadable; 2523 return check_memory_size(*long_arg, min_size); 2524} 2525 2526// Parse JavaVMInitArgs structure 2527 2528jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2529 // For components of the system classpath. 2530 SysClassPath scp(Arguments::get_sysclasspath()); 2531 bool scp_assembly_required = false; 2532 2533 // Save default settings for some mode flags 2534 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2535 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2536 Arguments::_ClipInlining = ClipInlining; 2537 Arguments::_BackgroundCompilation = BackgroundCompilation; 2538 if (TieredCompilation) { 2539 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2540 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2541 } 2542 2543 // Setup flags for mixed which is the default 2544 set_mode_flags(_mixed); 2545 2546 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2547 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2548 if (result != JNI_OK) { 2549 return result; 2550 } 2551 2552 // Parse JavaVMInitArgs structure passed in 2553 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE); 2554 if (result != JNI_OK) { 2555 return result; 2556 } 2557 2558 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2559 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2560 if (result != JNI_OK) { 2561 return result; 2562 } 2563 2564 // Do final processing now that all arguments have been parsed 2565 result = finalize_vm_init_args(&scp, scp_assembly_required); 2566 if (result != JNI_OK) { 2567 return result; 2568 } 2569 2570 return JNI_OK; 2571} 2572 2573// Checks if name in command-line argument -agent{lib,path}:name[=options] 2574// represents a valid HPROF of JDWP agent. is_path==true denotes that we 2575// are dealing with -agentpath (case where name is a path), otherwise with 2576// -agentlib 2577bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2578 char *_name; 2579 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2580 size_t _len_hprof, _len_jdwp, _len_prefix; 2581 2582 if (is_path) { 2583 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2584 return false; 2585 } 2586 2587 _name++; // skip past last path separator 2588 _len_prefix = strlen(JNI_LIB_PREFIX); 2589 2590 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2591 return false; 2592 } 2593 2594 _name += _len_prefix; 2595 _len_hprof = strlen(_hprof); 2596 _len_jdwp = strlen(_jdwp); 2597 2598 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2599 _name += _len_hprof; 2600 } 2601 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2602 _name += _len_jdwp; 2603 } 2604 else { 2605 return false; 2606 } 2607 2608 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2609 return false; 2610 } 2611 2612 return true; 2613 } 2614 2615 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2616 return true; 2617 } 2618 2619 return false; 2620} 2621 2622jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2623 SysClassPath* scp_p, 2624 bool* scp_assembly_required_p, 2625 Flag::Flags origin) { 2626 // Remaining part of option string 2627 const char* tail; 2628 2629 // iterate over arguments 2630 for (int index = 0; index < args->nOptions; index++) { 2631 bool is_absolute_path = false; // for -agentpath vs -agentlib 2632 2633 const JavaVMOption* option = args->options + index; 2634 2635 if (!match_option(option, "-Djava.class.path", &tail) && 2636 !match_option(option, "-Dsun.java.command", &tail) && 2637 !match_option(option, "-Dsun.java.launcher", &tail)) { 2638 2639 // add all jvm options to the jvm_args string. This string 2640 // is used later to set the java.vm.args PerfData string constant. 2641 // the -Djava.class.path and the -Dsun.java.command options are 2642 // omitted from jvm_args string as each have their own PerfData 2643 // string constant object. 2644 build_jvm_args(option->optionString); 2645 } 2646 2647 // -verbose:[class/gc/jni] 2648 if (match_option(option, "-verbose", &tail)) { 2649 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2650 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2651 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2652 } else if (!strcmp(tail, ":gc")) { 2653 FLAG_SET_CMDLINE(bool, PrintGC, true); 2654 } else if (!strcmp(tail, ":jni")) { 2655 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2656 } 2657 // -da / -ea / -disableassertions / -enableassertions 2658 // These accept an optional class/package name separated by a colon, e.g., 2659 // -da:java.lang.Thread. 2660 } else if (match_option(option, user_assertion_options, &tail, true)) { 2661 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2662 if (*tail == '\0') { 2663 JavaAssertions::setUserClassDefault(enable); 2664 } else { 2665 assert(*tail == ':', "bogus match by match_option()"); 2666 JavaAssertions::addOption(tail + 1, enable); 2667 } 2668 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2669 } else if (match_option(option, system_assertion_options, &tail, false)) { 2670 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2671 JavaAssertions::setSystemClassDefault(enable); 2672 // -bootclasspath: 2673 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2674 scp_p->reset_path(tail); 2675 *scp_assembly_required_p = true; 2676 // -bootclasspath/a: 2677 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2678 scp_p->add_suffix(tail); 2679 *scp_assembly_required_p = true; 2680 // -bootclasspath/p: 2681 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2682 scp_p->add_prefix(tail); 2683 *scp_assembly_required_p = true; 2684 // -Xrun 2685 } else if (match_option(option, "-Xrun", &tail)) { 2686 if (tail != NULL) { 2687 const char* pos = strchr(tail, ':'); 2688 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2689 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2690 name[len] = '\0'; 2691 2692 char *options = NULL; 2693 if(pos != NULL) { 2694 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2695 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2696 } 2697#if !INCLUDE_JVMTI 2698 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2699 jio_fprintf(defaultStream::error_stream(), 2700 "Profiling and debugging agents are not supported in this VM\n"); 2701 return JNI_ERR; 2702 } 2703#endif // !INCLUDE_JVMTI 2704 add_init_library(name, options); 2705 } 2706 // -agentlib and -agentpath 2707 } else if (match_option(option, "-agentlib:", &tail) || 2708 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2709 if(tail != NULL) { 2710 const char* pos = strchr(tail, '='); 2711 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2712 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2713 name[len] = '\0'; 2714 2715 char *options = NULL; 2716 if(pos != NULL) { 2717 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2718 } 2719#if !INCLUDE_JVMTI 2720 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2721 jio_fprintf(defaultStream::error_stream(), 2722 "Profiling and debugging agents are not supported in this VM\n"); 2723 return JNI_ERR; 2724 } 2725#endif // !INCLUDE_JVMTI 2726 add_init_agent(name, options, is_absolute_path); 2727 } 2728 // -javaagent 2729 } else if (match_option(option, "-javaagent:", &tail)) { 2730#if !INCLUDE_JVMTI 2731 jio_fprintf(defaultStream::error_stream(), 2732 "Instrumentation agents are not supported in this VM\n"); 2733 return JNI_ERR; 2734#else 2735 if(tail != NULL) { 2736 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2737 add_init_agent("instrument", options, false); 2738 } 2739#endif // !INCLUDE_JVMTI 2740 // -Xnoclassgc 2741 } else if (match_option(option, "-Xnoclassgc")) { 2742 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2743 // -Xconcgc 2744 } else if (match_option(option, "-Xconcgc")) { 2745 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2746 // -Xnoconcgc 2747 } else if (match_option(option, "-Xnoconcgc")) { 2748 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2749 // -Xbatch 2750 } else if (match_option(option, "-Xbatch")) { 2751 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2752 // -Xmn for compatibility with other JVM vendors 2753 } else if (match_option(option, "-Xmn", &tail)) { 2754 julong long_initial_young_size = 0; 2755 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2756 if (errcode != arg_in_range) { 2757 jio_fprintf(defaultStream::error_stream(), 2758 "Invalid initial young generation size: %s\n", option->optionString); 2759 describe_range_error(errcode); 2760 return JNI_EINVAL; 2761 } 2762 FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size); 2763 FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size); 2764 // -Xms 2765 } else if (match_option(option, "-Xms", &tail)) { 2766 julong long_initial_heap_size = 0; 2767 // an initial heap size of 0 means automatically determine 2768 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2769 if (errcode != arg_in_range) { 2770 jio_fprintf(defaultStream::error_stream(), 2771 "Invalid initial heap size: %s\n", option->optionString); 2772 describe_range_error(errcode); 2773 return JNI_EINVAL; 2774 } 2775 set_min_heap_size((size_t)long_initial_heap_size); 2776 // Currently the minimum size and the initial heap sizes are the same. 2777 // Can be overridden with -XX:InitialHeapSize. 2778 FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size); 2779 // -Xmx 2780 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2781 julong long_max_heap_size = 0; 2782 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2783 if (errcode != arg_in_range) { 2784 jio_fprintf(defaultStream::error_stream(), 2785 "Invalid maximum heap size: %s\n", option->optionString); 2786 describe_range_error(errcode); 2787 return JNI_EINVAL; 2788 } 2789 FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size); 2790 // Xmaxf 2791 } else if (match_option(option, "-Xmaxf", &tail)) { 2792 char* err; 2793 int maxf = (int)(strtod(tail, &err) * 100); 2794 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) { 2795 jio_fprintf(defaultStream::error_stream(), 2796 "Bad max heap free percentage size: %s\n", 2797 option->optionString); 2798 return JNI_EINVAL; 2799 } else { 2800 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2801 } 2802 // Xminf 2803 } else if (match_option(option, "-Xminf", &tail)) { 2804 char* err; 2805 int minf = (int)(strtod(tail, &err) * 100); 2806 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) { 2807 jio_fprintf(defaultStream::error_stream(), 2808 "Bad min heap free percentage size: %s\n", 2809 option->optionString); 2810 return JNI_EINVAL; 2811 } else { 2812 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2813 } 2814 // -Xss 2815 } else if (match_option(option, "-Xss", &tail)) { 2816 julong long_ThreadStackSize = 0; 2817 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2818 if (errcode != arg_in_range) { 2819 jio_fprintf(defaultStream::error_stream(), 2820 "Invalid thread stack size: %s\n", option->optionString); 2821 describe_range_error(errcode); 2822 return JNI_EINVAL; 2823 } 2824 // Internally track ThreadStackSize in units of 1024 bytes. 2825 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2826 round_to((int)long_ThreadStackSize, K) / K); 2827 // -Xoss 2828 } else if (match_option(option, "-Xoss", &tail)) { 2829 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2830 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2831 julong long_CodeCacheExpansionSize = 0; 2832 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2833 if (errcode != arg_in_range) { 2834 jio_fprintf(defaultStream::error_stream(), 2835 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2836 os::vm_page_size()/K); 2837 return JNI_EINVAL; 2838 } 2839 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2840 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2841 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2842 julong long_ReservedCodeCacheSize = 0; 2843 2844 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2845 if (errcode != arg_in_range) { 2846 jio_fprintf(defaultStream::error_stream(), 2847 "Invalid maximum code cache size: %s.\n", option->optionString); 2848 return JNI_EINVAL; 2849 } 2850 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2851 // -XX:NonNMethodCodeHeapSize= 2852 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 2853 julong long_NonNMethodCodeHeapSize = 0; 2854 2855 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 2856 if (errcode != arg_in_range) { 2857 jio_fprintf(defaultStream::error_stream(), 2858 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 2859 return JNI_EINVAL; 2860 } 2861 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize); 2862 // -XX:ProfiledCodeHeapSize= 2863 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 2864 julong long_ProfiledCodeHeapSize = 0; 2865 2866 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 2867 if (errcode != arg_in_range) { 2868 jio_fprintf(defaultStream::error_stream(), 2869 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 2870 return JNI_EINVAL; 2871 } 2872 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize); 2873 // -XX:NonProfiledCodeHeapSizee= 2874 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 2875 julong long_NonProfiledCodeHeapSize = 0; 2876 2877 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 2878 if (errcode != arg_in_range) { 2879 jio_fprintf(defaultStream::error_stream(), 2880 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 2881 return JNI_EINVAL; 2882 } 2883 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize); 2884 //-XX:IncreaseFirstTierCompileThresholdAt= 2885 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2886 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2887 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2888 jio_fprintf(defaultStream::error_stream(), 2889 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2890 option->optionString); 2891 return JNI_EINVAL; 2892 } 2893 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2894 // -green 2895 } else if (match_option(option, "-green")) { 2896 jio_fprintf(defaultStream::error_stream(), 2897 "Green threads support not available\n"); 2898 return JNI_EINVAL; 2899 // -native 2900 } else if (match_option(option, "-native")) { 2901 // HotSpot always uses native threads, ignore silently for compatibility 2902 // -Xsqnopause 2903 } else if (match_option(option, "-Xsqnopause")) { 2904 // EVM option, ignore silently for compatibility 2905 // -Xrs 2906 } else if (match_option(option, "-Xrs")) { 2907 // Classic/EVM option, new functionality 2908 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2909 } else if (match_option(option, "-Xusealtsigs")) { 2910 // change default internal VM signals used - lower case for back compat 2911 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2912 // -Xoptimize 2913 } else if (match_option(option, "-Xoptimize")) { 2914 // EVM option, ignore silently for compatibility 2915 // -Xprof 2916 } else if (match_option(option, "-Xprof")) { 2917#if INCLUDE_FPROF 2918 _has_profile = true; 2919#else // INCLUDE_FPROF 2920 jio_fprintf(defaultStream::error_stream(), 2921 "Flat profiling is not supported in this VM.\n"); 2922 return JNI_ERR; 2923#endif // INCLUDE_FPROF 2924 // -Xconcurrentio 2925 } else if (match_option(option, "-Xconcurrentio")) { 2926 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2927 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2928 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2929 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2930 FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2931 2932 // -Xinternalversion 2933 } else if (match_option(option, "-Xinternalversion")) { 2934 jio_fprintf(defaultStream::output_stream(), "%s\n", 2935 VM_Version::internal_vm_info_string()); 2936 vm_exit(0); 2937#ifndef PRODUCT 2938 // -Xprintflags 2939 } else if (match_option(option, "-Xprintflags")) { 2940 CommandLineFlags::printFlags(tty, false); 2941 vm_exit(0); 2942#endif 2943 // -D 2944 } else if (match_option(option, "-D", &tail)) { 2945 const char* value; 2946 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2947 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2948 // abort if -Djava.endorsed.dirs is set 2949 jio_fprintf(defaultStream::output_stream(), 2950 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2951 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2952 return JNI_EINVAL; 2953 } 2954 if (match_option(option, "-Djava.ext.dirs=", &value) && 2955 *value != '\0' && strcmp(value, "\"\"") != 0) { 2956 // abort if -Djava.ext.dirs is set 2957 jio_fprintf(defaultStream::output_stream(), 2958 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2959 return JNI_EINVAL; 2960 } 2961 2962 if (!add_property(tail)) { 2963 return JNI_ENOMEM; 2964 } 2965 // Out of the box management support 2966 if (match_option(option, "-Dcom.sun.management", &tail)) { 2967#if INCLUDE_MANAGEMENT 2968 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2969#else 2970 jio_fprintf(defaultStream::output_stream(), 2971 "-Dcom.sun.management is not supported in this VM.\n"); 2972 return JNI_ERR; 2973#endif 2974 } 2975 // -Xint 2976 } else if (match_option(option, "-Xint")) { 2977 set_mode_flags(_int); 2978 // -Xmixed 2979 } else if (match_option(option, "-Xmixed")) { 2980 set_mode_flags(_mixed); 2981 // -Xcomp 2982 } else if (match_option(option, "-Xcomp")) { 2983 // for testing the compiler; turn off all flags that inhibit compilation 2984 set_mode_flags(_comp); 2985 // -Xshare:dump 2986 } else if (match_option(option, "-Xshare:dump")) { 2987 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2988 set_mode_flags(_int); // Prevent compilation, which creates objects 2989 // -Xshare:on 2990 } else if (match_option(option, "-Xshare:on")) { 2991 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2992 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2993 // -Xshare:auto 2994 } else if (match_option(option, "-Xshare:auto")) { 2995 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2996 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2997 // -Xshare:off 2998 } else if (match_option(option, "-Xshare:off")) { 2999 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 3000 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3001 // -Xverify 3002 } else if (match_option(option, "-Xverify", &tail)) { 3003 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3004 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 3005 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3006 } else if (strcmp(tail, ":remote") == 0) { 3007 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3008 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3009 } else if (strcmp(tail, ":none") == 0) { 3010 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3011 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 3012 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3013 return JNI_EINVAL; 3014 } 3015 // -Xdebug 3016 } else if (match_option(option, "-Xdebug")) { 3017 // note this flag has been used, then ignore 3018 set_xdebug_mode(true); 3019 // -Xnoagent 3020 } else if (match_option(option, "-Xnoagent")) { 3021 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3022 } else if (match_option(option, "-Xboundthreads")) { 3023 // Bind user level threads to kernel threads (Solaris only) 3024 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 3025 } else if (match_option(option, "-Xloggc:", &tail)) { 3026 // Redirect GC output to the file. -Xloggc:<filename> 3027 // ostream_init_log(), when called will use this filename 3028 // to initialize a fileStream. 3029 _gc_log_filename = os::strdup_check_oom(tail); 3030 if (!is_filename_valid(_gc_log_filename)) { 3031 jio_fprintf(defaultStream::output_stream(), 3032 "Invalid file name for use with -Xloggc: Filename can only contain the " 3033 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 3034 "Note %%p or %%t can only be used once\n", _gc_log_filename); 3035 return JNI_EINVAL; 3036 } 3037 FLAG_SET_CMDLINE(bool, PrintGC, true); 3038 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 3039 3040 // JNI hooks 3041 } else if (match_option(option, "-Xcheck", &tail)) { 3042 if (!strcmp(tail, ":jni")) { 3043#if !INCLUDE_JNI_CHECK 3044 warning("JNI CHECKING is not supported in this VM"); 3045#else 3046 CheckJNICalls = true; 3047#endif // INCLUDE_JNI_CHECK 3048 } else if (is_bad_option(option, args->ignoreUnrecognized, 3049 "check")) { 3050 return JNI_EINVAL; 3051 } 3052 } else if (match_option(option, "vfprintf")) { 3053 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3054 } else if (match_option(option, "exit")) { 3055 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3056 } else if (match_option(option, "abort")) { 3057 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3058 // -XX:+AggressiveHeap 3059 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3060 3061 // This option inspects the machine and attempts to set various 3062 // parameters to be optimal for long-running, memory allocation 3063 // intensive jobs. It is intended for machines with large 3064 // amounts of cpu and memory. 3065 3066 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 3067 // VM, but we may not be able to represent the total physical memory 3068 // available (like having 8gb of memory on a box but using a 32bit VM). 3069 // Thus, we need to make sure we're using a julong for intermediate 3070 // calculations. 3071 julong initHeapSize; 3072 julong total_memory = os::physical_memory(); 3073 3074 if (total_memory < (julong)256*M) { 3075 jio_fprintf(defaultStream::error_stream(), 3076 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 3077 vm_exit(1); 3078 } 3079 3080 // The heap size is half of available memory, or (at most) 3081 // all of possible memory less 160mb (leaving room for the OS 3082 // when using ISM). This is the maximum; because adaptive sizing 3083 // is turned on below, the actual space used may be smaller. 3084 3085 initHeapSize = MIN2(total_memory / (julong)2, 3086 total_memory - (julong)160*M); 3087 3088 initHeapSize = limit_by_allocatable_memory(initHeapSize); 3089 3090 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 3091 FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize); 3092 FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize); 3093 // Currently the minimum size and the initial heap sizes are the same. 3094 set_min_heap_size(initHeapSize); 3095 } 3096 if (FLAG_IS_DEFAULT(NewSize)) { 3097 // Make the young generation 3/8ths of the total heap. 3098 FLAG_SET_CMDLINE(size_t, NewSize, 3099 ((julong)MaxHeapSize / (julong)8) * (julong)3); 3100 FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize); 3101 } 3102 3103#if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 3104 FLAG_SET_DEFAULT(UseLargePages, true); 3105#endif 3106 3107 // Increase some data structure sizes for efficiency 3108 FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize); 3109 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3110 FLAG_SET_CMDLINE(size_t, TLABSize, 256*K); 3111 3112 // See the OldPLABSize comment below, but replace 'after promotion' 3113 // with 'after copying'. YoungPLABSize is the size of the survivor 3114 // space per-gc-thread buffers. The default is 4kw. 3115 FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256*K); // Note: this is in words 3116 3117 // OldPLABSize is the size of the buffers in the old gen that 3118 // UseParallelGC uses to promote live data that doesn't fit in the 3119 // survivor spaces. At any given time, there's one for each gc thread. 3120 // The default size is 1kw. These buffers are rarely used, since the 3121 // survivor spaces are usually big enough. For specjbb, however, there 3122 // are occasions when there's lots of live data in the young gen 3123 // and we end up promoting some of it. We don't have a definite 3124 // explanation for why bumping OldPLABSize helps, but the theory 3125 // is that a bigger PLAB results in retaining something like the 3126 // original allocation order after promotion, which improves mutator 3127 // locality. A minor effect may be that larger PLABs reduce the 3128 // number of PLAB allocation events during gc. The value of 8kw 3129 // was arrived at by experimenting with specjbb. 3130 FLAG_SET_CMDLINE(size_t, OldPLABSize, 8*K); // Note: this is in words 3131 3132 // Enable parallel GC and adaptive generation sizing 3133 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 3134 FLAG_SET_DEFAULT(ParallelGCThreads, 3135 Abstract_VM_Version::parallel_worker_threads()); 3136 3137 // Encourage steady state memory management 3138 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 3139 3140 // This appears to improve mutator locality 3141 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3142 3143 // Get around early Solaris scheduling bug 3144 // (affinity vs other jobs on system) 3145 // but disallow DR and offlining (5008695). 3146 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 3147 3148 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3149 // and the last option wins. 3150 } else if (match_option(option, "-XX:+NeverTenure")) { 3151 FLAG_SET_CMDLINE(bool, NeverTenure, true); 3152 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3153 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1); 3154 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3155 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3156 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3157 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 3158 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3159 uintx max_tenuring_thresh = 0; 3160 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3161 jio_fprintf(defaultStream::error_stream(), 3162 "Improperly specified VM option 'MaxTenuringThreshold=%s'\n", tail); 3163 return JNI_EINVAL; 3164 } 3165 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh); 3166 3167 if (MaxTenuringThreshold == 0) { 3168 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3169 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3170 } else { 3171 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3172 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3173 } 3174 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3175 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3176 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3177 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3178 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3179 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3180 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3181#if defined(DTRACE_ENABLED) 3182 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3183 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3184 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3185 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3186#else // defined(DTRACE_ENABLED) 3187 jio_fprintf(defaultStream::error_stream(), 3188 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3189 return JNI_EINVAL; 3190#endif // defined(DTRACE_ENABLED) 3191#ifdef ASSERT 3192 } else if (match_option(option, "-XX:+FullGCALot")) { 3193 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3194 // disable scavenge before parallel mark-compact 3195 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3196#endif 3197 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3198 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3199 julong stack_size = 0; 3200 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3201 if (errcode != arg_in_range) { 3202 jio_fprintf(defaultStream::error_stream(), 3203 "Invalid mark stack size: %s\n", option->optionString); 3204 describe_range_error(errcode); 3205 return JNI_EINVAL; 3206 } 3207 jio_fprintf(defaultStream::error_stream(), 3208 "Please use -XX:MarkStackSize in place of " 3209 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n"); 3210 FLAG_SET_CMDLINE(size_t, MarkStackSize, stack_size); 3211 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3212 julong max_stack_size = 0; 3213 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3214 if (errcode != arg_in_range) { 3215 jio_fprintf(defaultStream::error_stream(), 3216 "Invalid maximum mark stack size: %s\n", 3217 option->optionString); 3218 describe_range_error(errcode); 3219 return JNI_EINVAL; 3220 } 3221 jio_fprintf(defaultStream::error_stream(), 3222 "Please use -XX:MarkStackSizeMax in place of " 3223 "-XX:CMSMarkStackSizeMax in the future\n"); 3224 FLAG_SET_CMDLINE(size_t, MarkStackSizeMax, max_stack_size); 3225 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3226 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3227 uintx conc_threads = 0; 3228 if (!parse_uintx(tail, &conc_threads, 1)) { 3229 jio_fprintf(defaultStream::error_stream(), 3230 "Invalid concurrent threads: %s\n", option->optionString); 3231 return JNI_EINVAL; 3232 } 3233 jio_fprintf(defaultStream::error_stream(), 3234 "Please use -XX:ConcGCThreads in place of " 3235 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n"); 3236 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3237 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3238 julong max_direct_memory_size = 0; 3239 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3240 if (errcode != arg_in_range) { 3241 jio_fprintf(defaultStream::error_stream(), 3242 "Invalid maximum direct memory size: %s\n", 3243 option->optionString); 3244 describe_range_error(errcode); 3245 return JNI_EINVAL; 3246 } 3247 FLAG_SET_CMDLINE(size_t, MaxDirectMemorySize, max_direct_memory_size); 3248#if !INCLUDE_MANAGEMENT 3249 } else if (match_option(option, "-XX:+ManagementServer")) { 3250 jio_fprintf(defaultStream::error_stream(), 3251 "ManagementServer is not supported in this VM.\n"); 3252 return JNI_ERR; 3253#endif // INCLUDE_MANAGEMENT 3254 // CreateMinidumpOnCrash is removed, and replaced by CreateCoredumpOnCrash 3255 } else if (match_option(option, "-XX:+CreateMinidumpOnCrash")) { 3256 FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, true); 3257 jio_fprintf(defaultStream::output_stream(), 3258 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is on\n"); 3259 } else if (match_option(option, "-XX:-CreateMinidumpOnCrash")) { 3260 FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, false); 3261 jio_fprintf(defaultStream::output_stream(), 3262 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is off\n"); 3263 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3264 // Skip -XX:Flags= since that case has already been handled 3265 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3266 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3267 return JNI_EINVAL; 3268 } 3269 } 3270 // Unknown option 3271 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3272 return JNI_ERR; 3273 } 3274 } 3275 3276 // PrintSharedArchiveAndExit will turn on 3277 // -Xshare:on 3278 // -XX:+TraceClassPaths 3279 if (PrintSharedArchiveAndExit) { 3280 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3281 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3282 FLAG_SET_CMDLINE(bool, TraceClassPaths, true); 3283 } 3284 3285 // Change the default value for flags which have different default values 3286 // when working with older JDKs. 3287#ifdef LINUX 3288 if (JDK_Version::current().compare_major(6) <= 0 && 3289 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3290 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3291 } 3292#endif // LINUX 3293 fix_appclasspath(); 3294 return JNI_OK; 3295} 3296 3297// Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3298// 3299// This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3300// in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3301// Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3302// path is treated as the current directory. 3303// 3304// This causes problems with CDS, which requires that all directories specified in the classpath 3305// must be empty. In most cases, applications do NOT want to load classes from the current 3306// directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3307// scripts compatible with CDS. 3308void Arguments::fix_appclasspath() { 3309 if (IgnoreEmptyClassPaths) { 3310 const char separator = *os::path_separator(); 3311 const char* src = _java_class_path->value(); 3312 3313 // skip over all the leading empty paths 3314 while (*src == separator) { 3315 src ++; 3316 } 3317 3318 char* copy = AllocateHeap(strlen(src) + 1, mtInternal); 3319 strncpy(copy, src, strlen(src) + 1); 3320 3321 // trim all trailing empty paths 3322 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3323 *tail = '\0'; 3324 } 3325 3326 char from[3] = {separator, separator, '\0'}; 3327 char to [2] = {separator, '\0'}; 3328 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3329 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3330 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3331 } 3332 3333 _java_class_path->set_value(copy); 3334 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3335 } 3336 3337 if (!PrintSharedArchiveAndExit) { 3338 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value()); 3339 } 3340} 3341 3342static bool has_jar_files(const char* directory) { 3343 DIR* dir = os::opendir(directory); 3344 if (dir == NULL) return false; 3345 3346 struct dirent *entry; 3347 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 3348 bool hasJarFile = false; 3349 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3350 const char* name = entry->d_name; 3351 const char* ext = name + strlen(name) - 4; 3352 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3353 } 3354 FREE_C_HEAP_ARRAY(char, dbuf); 3355 os::closedir(dir); 3356 return hasJarFile ; 3357} 3358 3359static int check_non_empty_dirs(const char* path) { 3360 const char separator = *os::path_separator(); 3361 const char* const end = path + strlen(path); 3362 int nonEmptyDirs = 0; 3363 while (path < end) { 3364 const char* tmp_end = strchr(path, separator); 3365 if (tmp_end == NULL) { 3366 if (has_jar_files(path)) { 3367 nonEmptyDirs++; 3368 jio_fprintf(defaultStream::output_stream(), 3369 "Non-empty directory: %s\n", path); 3370 } 3371 path = end; 3372 } else { 3373 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 3374 memcpy(dirpath, path, tmp_end - path); 3375 dirpath[tmp_end - path] = '\0'; 3376 if (has_jar_files(dirpath)) { 3377 nonEmptyDirs++; 3378 jio_fprintf(defaultStream::output_stream(), 3379 "Non-empty directory: %s\n", dirpath); 3380 } 3381 FREE_C_HEAP_ARRAY(char, dirpath); 3382 path = tmp_end + 1; 3383 } 3384 } 3385 return nonEmptyDirs; 3386} 3387 3388jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3389 // check if the default lib/endorsed directory exists; if so, error 3390 char path[JVM_MAXPATHLEN]; 3391 const char* fileSep = os::file_separator(); 3392 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3393 3394 if (CheckEndorsedAndExtDirs) { 3395 int nonEmptyDirs = 0; 3396 // check endorsed directory 3397 nonEmptyDirs += check_non_empty_dirs(path); 3398 // check the extension directories 3399 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3400 if (nonEmptyDirs > 0) { 3401 return JNI_ERR; 3402 } 3403 } 3404 3405 DIR* dir = os::opendir(path); 3406 if (dir != NULL) { 3407 jio_fprintf(defaultStream::output_stream(), 3408 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3409 "in modular form will be supported via the concept of upgradeable modules.\n"); 3410 os::closedir(dir); 3411 return JNI_ERR; 3412 } 3413 3414 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3415 dir = os::opendir(path); 3416 if (dir != NULL) { 3417 jio_fprintf(defaultStream::output_stream(), 3418 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3419 "Use -classpath instead.\n."); 3420 os::closedir(dir); 3421 return JNI_ERR; 3422 } 3423 3424 if (scp_assembly_required) { 3425 // Assemble the bootclasspath elements into the final path. 3426 Arguments::set_sysclasspath(scp_p->combined_path()); 3427 } 3428 3429 // This must be done after all arguments have been processed. 3430 // java_compiler() true means set to "NONE" or empty. 3431 if (java_compiler() && !xdebug_mode()) { 3432 // For backwards compatibility, we switch to interpreted mode if 3433 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3434 // not specified. 3435 set_mode_flags(_int); 3436 } 3437 3438 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3439 // but like -Xint, leave compilation thresholds unaffected. 3440 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3441 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3442 set_mode_flags(_int); 3443 } 3444 3445 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3446 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3447 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3448 } 3449 3450#ifndef COMPILER2 3451 // Don't degrade server performance for footprint 3452 if (FLAG_IS_DEFAULT(UseLargePages) && 3453 MaxHeapSize < LargePageHeapSizeThreshold) { 3454 // No need for large granularity pages w/small heaps. 3455 // Note that large pages are enabled/disabled for both the 3456 // Java heap and the code cache. 3457 FLAG_SET_DEFAULT(UseLargePages, false); 3458 } 3459 3460#else 3461 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3462 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3463 } 3464#endif 3465 3466#ifndef TIERED 3467 // Tiered compilation is undefined. 3468 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3469#endif 3470 3471 // If we are running in a headless jre, force java.awt.headless property 3472 // to be true unless the property has already been set. 3473 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3474 if (os::is_headless_jre()) { 3475 const char* headless = Arguments::get_property("java.awt.headless"); 3476 if (headless == NULL) { 3477 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3478 if (headless_env == NULL) { 3479 if (!add_property("java.awt.headless=true")) { 3480 return JNI_ENOMEM; 3481 } 3482 } else { 3483 char buffer[256]; 3484 const char *key = "java.awt.headless="; 3485 strcpy(buffer, key); 3486 strncat(buffer, headless_env, 256 - strlen(key) - 1); 3487 if (!add_property(buffer)) { 3488 return JNI_ENOMEM; 3489 } 3490 } 3491 } 3492 } 3493 3494 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) { 3495 // CMS can only be used with ParNew 3496 FLAG_SET_ERGO(bool, UseParNewGC, true); 3497 } 3498 3499 if (!check_vm_args_consistency()) { 3500 return JNI_ERR; 3501 } 3502 3503 return JNI_OK; 3504} 3505 3506jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3507 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3508 scp_assembly_required_p); 3509} 3510 3511jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3512 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3513 scp_assembly_required_p); 3514} 3515 3516jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3517 char *buffer = ::getenv(name); 3518 3519 // Don't check this variable if user has special privileges 3520 // (e.g. unix su command). 3521 if (buffer == NULL || os::have_special_privileges()) { 3522 return JNI_OK; 3523 } 3524 3525 if ((buffer = os::strdup(buffer)) == NULL) { 3526 return JNI_ENOMEM; 3527 } 3528 3529 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array 3530 jio_fprintf(defaultStream::error_stream(), 3531 "Picked up %s: %s\n", name, buffer); 3532 char* rd = buffer; // pointer to the input string (rd) 3533 while (true) { // repeat for all options in the input string 3534 while (isspace(*rd)) rd++; // skip whitespace 3535 if (*rd == 0) break; // we re done when the input string is read completely 3536 3537 // The output, option string, overwrites the input string. 3538 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3539 // input string (rd). 3540 char* wrt = rd; 3541 3542 JavaVMOption option; 3543 option.optionString = wrt; 3544 options->append(option); // Fill in option 3545 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3546 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3547 int quote = *rd; // matching quote to look for 3548 rd++; // don't copy open quote 3549 while (*rd != quote) { // include everything (even spaces) up until quote 3550 if (*rd == 0) { // string termination means unmatched string 3551 jio_fprintf(defaultStream::error_stream(), 3552 "Unmatched quote in %s\n", name); 3553 delete options; 3554 os::free(buffer); 3555 return JNI_ERR; 3556 } 3557 *wrt++ = *rd++; // copy to option string 3558 } 3559 rd++; // don't copy close quote 3560 } else { 3561 *wrt++ = *rd++; // copy to option string 3562 } 3563 } 3564 // Need to check if we're done before writing a NULL, 3565 // because the write could be to the byte that rd is pointing to. 3566 if (*rd++ == 0) { 3567 *wrt = 0; 3568 break; 3569 } 3570 *wrt = 0; // Zero terminate option 3571 } 3572 JavaVMOption* options_arr = 3573 NEW_C_HEAP_ARRAY_RETURN_NULL(JavaVMOption, options->length(), mtInternal); 3574 if (options_arr == NULL) { 3575 delete options; 3576 os::free(buffer); 3577 return JNI_ENOMEM; 3578 } 3579 for (int i = 0; i < options->length(); i++) { 3580 options_arr[i] = options->at(i); 3581 } 3582 3583 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3584 JavaVMInitArgs vm_args; 3585 vm_args.version = JNI_VERSION_1_2; 3586 vm_args.options = options_arr; 3587 vm_args.nOptions = options->length(); 3588 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3589 3590 if (PrintVMOptions) { 3591 const char* tail; 3592 for (int i = 0; i < vm_args.nOptions; i++) { 3593 const JavaVMOption *option = vm_args.options + i; 3594 if (match_option(option, "-XX:", &tail)) { 3595 logOption(tail); 3596 } 3597 } 3598 } 3599 3600 jint result = parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, 3601 Flag::ENVIRON_VAR); 3602 FREE_C_HEAP_ARRAY(JavaVMOption, options_arr); 3603 delete options; 3604 os::free(buffer); 3605 return result; 3606} 3607 3608void Arguments::set_shared_spaces_flags() { 3609 if (DumpSharedSpaces) { 3610 if (RequireSharedSpaces) { 3611 warning("cannot dump shared archive while using shared archive"); 3612 } 3613 UseSharedSpaces = false; 3614#ifdef _LP64 3615 if (!UseCompressedOops || !UseCompressedClassPointers) { 3616 vm_exit_during_initialization( 3617 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3618 } 3619 } else { 3620 if (!UseCompressedOops || !UseCompressedClassPointers) { 3621 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3622 } 3623#endif 3624 } 3625} 3626 3627#if !INCLUDE_ALL_GCS 3628static void force_serial_gc() { 3629 FLAG_SET_DEFAULT(UseSerialGC, true); 3630 UNSUPPORTED_GC_OPTION(UseG1GC); 3631 UNSUPPORTED_GC_OPTION(UseParallelGC); 3632 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3633 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3634 UNSUPPORTED_GC_OPTION(UseParNewGC); 3635} 3636#endif // INCLUDE_ALL_GCS 3637 3638// Sharing support 3639// Construct the path to the archive 3640static char* get_shared_archive_path() { 3641 char *shared_archive_path; 3642 if (SharedArchiveFile == NULL) { 3643 char jvm_path[JVM_MAXPATHLEN]; 3644 os::jvm_path(jvm_path, sizeof(jvm_path)); 3645 char *end = strrchr(jvm_path, *os::file_separator()); 3646 if (end != NULL) *end = '\0'; 3647 size_t jvm_path_len = strlen(jvm_path); 3648 size_t file_sep_len = strlen(os::file_separator()); 3649 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3650 file_sep_len + 20, mtInternal); 3651 if (shared_archive_path != NULL) { 3652 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3653 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3654 strncat(shared_archive_path, "classes.jsa", 11); 3655 } 3656 } else { 3657 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3658 if (shared_archive_path != NULL) { 3659 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3660 } 3661 } 3662 return shared_archive_path; 3663} 3664 3665#ifndef PRODUCT 3666// Determine whether LogVMOutput should be implicitly turned on. 3667static bool use_vm_log() { 3668 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3669 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3670 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3671 PrintAssembly || TraceDeoptimization || TraceDependencies || 3672 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3673 return true; 3674 } 3675 3676#ifdef COMPILER1 3677 if (PrintC1Statistics) { 3678 return true; 3679 } 3680#endif // COMPILER1 3681 3682#ifdef COMPILER2 3683 if (PrintOptoAssembly || PrintOptoStatistics) { 3684 return true; 3685 } 3686#endif // COMPILER2 3687 3688 return false; 3689} 3690#endif // PRODUCT 3691 3692// Parse entry point called from JNI_CreateJavaVM 3693 3694jint Arguments::parse(const JavaVMInitArgs* args) { 3695 3696 // Remaining part of option string 3697 const char* tail; 3698 3699 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3700 const char* hotspotrc = ".hotspotrc"; 3701 bool settings_file_specified = false; 3702 bool needs_hotspotrc_warning = false; 3703 3704 const char* flags_file; 3705 int index; 3706 for (index = 0; index < args->nOptions; index++) { 3707 const JavaVMOption *option = args->options + index; 3708 if (ArgumentsExt::process_options(option)) { 3709 continue; 3710 } 3711 if (match_option(option, "-XX:Flags=", &tail)) { 3712 flags_file = tail; 3713 settings_file_specified = true; 3714 continue; 3715 } 3716 if (match_option(option, "-XX:+PrintVMOptions")) { 3717 PrintVMOptions = true; 3718 continue; 3719 } 3720 if (match_option(option, "-XX:-PrintVMOptions")) { 3721 PrintVMOptions = false; 3722 continue; 3723 } 3724 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3725 IgnoreUnrecognizedVMOptions = true; 3726 continue; 3727 } 3728 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3729 IgnoreUnrecognizedVMOptions = false; 3730 continue; 3731 } 3732 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3733 CommandLineFlags::printFlags(tty, false); 3734 vm_exit(0); 3735 } 3736 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3737#if INCLUDE_NMT 3738 // The launcher did not setup nmt environment variable properly. 3739 if (!MemTracker::check_launcher_nmt_support(tail)) { 3740 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3741 } 3742 3743 // Verify if nmt option is valid. 3744 if (MemTracker::verify_nmt_option()) { 3745 // Late initialization, still in single-threaded mode. 3746 if (MemTracker::tracking_level() >= NMT_summary) { 3747 MemTracker::init(); 3748 } 3749 } else { 3750 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3751 } 3752 continue; 3753#else 3754 jio_fprintf(defaultStream::error_stream(), 3755 "Native Memory Tracking is not supported in this VM\n"); 3756 return JNI_ERR; 3757#endif 3758 } 3759 3760#ifndef PRODUCT 3761 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3762 CommandLineFlags::printFlags(tty, true); 3763 vm_exit(0); 3764 } 3765#endif 3766 } 3767 3768 if (IgnoreUnrecognizedVMOptions) { 3769 // uncast const to modify the flag args->ignoreUnrecognized 3770 *(jboolean*)(&args->ignoreUnrecognized) = true; 3771 } 3772 3773 // Parse specified settings file 3774 if (settings_file_specified) { 3775 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3776 return JNI_EINVAL; 3777 } 3778 } else { 3779#ifdef ASSERT 3780 // Parse default .hotspotrc settings file 3781 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3782 return JNI_EINVAL; 3783 } 3784#else 3785 struct stat buf; 3786 if (os::stat(hotspotrc, &buf) == 0) { 3787 needs_hotspotrc_warning = true; 3788 } 3789#endif 3790 } 3791 3792 if (PrintVMOptions) { 3793 for (index = 0; index < args->nOptions; index++) { 3794 const JavaVMOption *option = args->options + index; 3795 if (match_option(option, "-XX:", &tail)) { 3796 logOption(tail); 3797 } 3798 } 3799 } 3800 3801 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3802 jint result = parse_vm_init_args(args); 3803 if (result != JNI_OK) { 3804 return result; 3805 } 3806 3807 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3808 SharedArchivePath = get_shared_archive_path(); 3809 if (SharedArchivePath == NULL) { 3810 return JNI_ENOMEM; 3811 } 3812 3813 // Set up VerifySharedSpaces 3814 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 3815 VerifySharedSpaces = true; 3816 } 3817 3818 // Delay warning until here so that we've had a chance to process 3819 // the -XX:-PrintWarnings flag 3820 if (needs_hotspotrc_warning) { 3821 warning("%s file is present but has been ignored. " 3822 "Run with -XX:Flags=%s to load the file.", 3823 hotspotrc, hotspotrc); 3824 } 3825 3826#if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 3827 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3828#endif 3829 3830 ArgumentsExt::report_unsupported_options(); 3831 3832#ifndef PRODUCT 3833 if (TraceBytecodesAt != 0) { 3834 TraceBytecodes = true; 3835 } 3836 if (CountCompiledCalls) { 3837 if (UseCounterDecay) { 3838 warning("UseCounterDecay disabled because CountCalls is set"); 3839 UseCounterDecay = false; 3840 } 3841 } 3842#endif // PRODUCT 3843 3844 if (ScavengeRootsInCode == 0) { 3845 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3846 warning("forcing ScavengeRootsInCode non-zero"); 3847 } 3848 ScavengeRootsInCode = 1; 3849 } 3850 3851 if (PrintGCDetails) { 3852 // Turn on -verbose:gc options as well 3853 PrintGC = true; 3854 } 3855 3856 // Set object alignment values. 3857 set_object_alignment(); 3858 3859#if !INCLUDE_ALL_GCS 3860 force_serial_gc(); 3861#endif // INCLUDE_ALL_GCS 3862#if !INCLUDE_CDS 3863 if (DumpSharedSpaces || RequireSharedSpaces) { 3864 jio_fprintf(defaultStream::error_stream(), 3865 "Shared spaces are not supported in this VM\n"); 3866 return JNI_ERR; 3867 } 3868 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3869 warning("Shared spaces are not supported in this VM"); 3870 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3871 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3872 } 3873 no_shared_spaces("CDS Disabled"); 3874#endif // INCLUDE_CDS 3875 3876 return JNI_OK; 3877} 3878 3879jint Arguments::apply_ergo() { 3880 3881 // Set flags based on ergonomics. 3882 set_ergonomics_flags(); 3883 3884 set_shared_spaces_flags(); 3885 3886 // Check the GC selections again. 3887 if (!check_gc_consistency()) { 3888 return JNI_EINVAL; 3889 } 3890 3891 if (TieredCompilation) { 3892 set_tiered_flags(); 3893 } else { 3894 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3895 if (CompilationPolicyChoice >= 2) { 3896 vm_exit_during_initialization( 3897 "Incompatible compilation policy selected", NULL); 3898 } 3899 // Scale CompileThreshold 3900 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 3901 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 3902 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 3903 } 3904 } 3905 3906#ifdef COMPILER2 3907#ifndef PRODUCT 3908 if (PrintIdealGraphLevel > 0) { 3909 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 3910 } 3911#endif 3912#endif 3913 3914 // Set heap size based on available physical memory 3915 set_heap_size(); 3916 3917 ArgumentsExt::set_gc_specific_flags(); 3918 3919 // Initialize Metaspace flags and alignments 3920 Metaspace::ergo_initialize(); 3921 3922 // Set bytecode rewriting flags 3923 set_bytecode_flags(); 3924 3925 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 3926 set_aggressive_opts_flags(); 3927 3928 // Turn off biased locking for locking debug mode flags, 3929 // which are subtly different from each other but neither works with 3930 // biased locking 3931 if (UseHeavyMonitors 3932#ifdef COMPILER1 3933 || !UseFastLocking 3934#endif // COMPILER1 3935 ) { 3936 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3937 // flag set to true on command line; warn the user that they 3938 // can't enable biased locking here 3939 warning("Biased Locking is not supported with locking debug flags" 3940 "; ignoring UseBiasedLocking flag." ); 3941 } 3942 UseBiasedLocking = false; 3943 } 3944 3945#ifdef ZERO 3946 // Clear flags not supported on zero. 3947 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3948 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3949 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3950 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3951#endif // CC_INTERP 3952 3953#ifdef COMPILER2 3954 if (!EliminateLocks) { 3955 EliminateNestedLocks = false; 3956 } 3957 if (!Inline) { 3958 IncrementalInline = false; 3959 } 3960#ifndef PRODUCT 3961 if (!IncrementalInline) { 3962 AlwaysIncrementalInline = false; 3963 } 3964#endif 3965 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 3966 // nothing to use the profiling, turn if off 3967 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 3968 } 3969#endif 3970 3971 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3972 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3973 DebugNonSafepoints = true; 3974 } 3975 3976 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3977 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3978 } 3979 3980#ifndef PRODUCT 3981 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3982 if (use_vm_log()) { 3983 LogVMOutput = true; 3984 } 3985 } 3986#endif // PRODUCT 3987 3988 if (PrintCommandLineFlags) { 3989 CommandLineFlags::printSetFlags(tty); 3990 } 3991 3992 // Apply CPU specific policy for the BiasedLocking 3993 if (UseBiasedLocking) { 3994 if (!VM_Version::use_biased_locking() && 3995 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3996 UseBiasedLocking = false; 3997 } 3998 } 3999#ifdef COMPILER2 4000 if (!UseBiasedLocking || EmitSync != 0) { 4001 UseOptoBiasInlining = false; 4002 } 4003#endif 4004 4005 return JNI_OK; 4006} 4007 4008jint Arguments::adjust_after_os() { 4009 if (UseNUMA) { 4010 if (UseParallelGC || UseParallelOldGC) { 4011 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4012 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4013 } 4014 } 4015 // UseNUMAInterleaving is set to ON for all collectors and 4016 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4017 // such as the parallel collector for Linux and Solaris will 4018 // interleave old gen and survivor spaces on top of NUMA 4019 // allocation policy for the eden space. 4020 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4021 // all platforms and ParallelGC on Windows will interleave all 4022 // of the heap spaces across NUMA nodes. 4023 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4024 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4025 } 4026 } 4027 return JNI_OK; 4028} 4029 4030int Arguments::PropertyList_count(SystemProperty* pl) { 4031 int count = 0; 4032 while(pl != NULL) { 4033 count++; 4034 pl = pl->next(); 4035 } 4036 return count; 4037} 4038 4039const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4040 assert(key != NULL, "just checking"); 4041 SystemProperty* prop; 4042 for (prop = pl; prop != NULL; prop = prop->next()) { 4043 if (strcmp(key, prop->key()) == 0) return prop->value(); 4044 } 4045 return NULL; 4046} 4047 4048const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4049 int count = 0; 4050 const char* ret_val = NULL; 4051 4052 while(pl != NULL) { 4053 if(count >= index) { 4054 ret_val = pl->key(); 4055 break; 4056 } 4057 count++; 4058 pl = pl->next(); 4059 } 4060 4061 return ret_val; 4062} 4063 4064char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4065 int count = 0; 4066 char* ret_val = NULL; 4067 4068 while(pl != NULL) { 4069 if(count >= index) { 4070 ret_val = pl->value(); 4071 break; 4072 } 4073 count++; 4074 pl = pl->next(); 4075 } 4076 4077 return ret_val; 4078} 4079 4080void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4081 SystemProperty* p = *plist; 4082 if (p == NULL) { 4083 *plist = new_p; 4084 } else { 4085 while (p->next() != NULL) { 4086 p = p->next(); 4087 } 4088 p->set_next(new_p); 4089 } 4090} 4091 4092void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 4093 if (plist == NULL) 4094 return; 4095 4096 SystemProperty* new_p = new SystemProperty(k, v, true); 4097 PropertyList_add(plist, new_p); 4098} 4099 4100void Arguments::PropertyList_add(SystemProperty *element) { 4101 PropertyList_add(&_system_properties, element); 4102} 4103 4104// This add maintains unique property key in the list. 4105void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 4106 if (plist == NULL) 4107 return; 4108 4109 // If property key exist then update with new value. 4110 SystemProperty* prop; 4111 for (prop = *plist; prop != NULL; prop = prop->next()) { 4112 if (strcmp(k, prop->key()) == 0) { 4113 if (append) { 4114 prop->append_value(v); 4115 } else { 4116 prop->set_value(v); 4117 } 4118 return; 4119 } 4120 } 4121 4122 PropertyList_add(plist, k, v); 4123} 4124 4125// Copies src into buf, replacing "%%" with "%" and "%p" with pid 4126// Returns true if all of the source pointed by src has been copied over to 4127// the destination buffer pointed by buf. Otherwise, returns false. 4128// Notes: 4129// 1. If the length (buflen) of the destination buffer excluding the 4130// NULL terminator character is not long enough for holding the expanded 4131// pid characters, it also returns false instead of returning the partially 4132// expanded one. 4133// 2. The passed in "buflen" should be large enough to hold the null terminator. 4134bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4135 char* buf, size_t buflen) { 4136 const char* p = src; 4137 char* b = buf; 4138 const char* src_end = &src[srclen]; 4139 char* buf_end = &buf[buflen - 1]; 4140 4141 while (p < src_end && b < buf_end) { 4142 if (*p == '%') { 4143 switch (*(++p)) { 4144 case '%': // "%%" ==> "%" 4145 *b++ = *p++; 4146 break; 4147 case 'p': { // "%p" ==> current process id 4148 // buf_end points to the character before the last character so 4149 // that we could write '\0' to the end of the buffer. 4150 size_t buf_sz = buf_end - b + 1; 4151 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4152 4153 // if jio_snprintf fails or the buffer is not long enough to hold 4154 // the expanded pid, returns false. 4155 if (ret < 0 || ret >= (int)buf_sz) { 4156 return false; 4157 } else { 4158 b += ret; 4159 assert(*b == '\0', "fail in copy_expand_pid"); 4160 if (p == src_end && b == buf_end + 1) { 4161 // reach the end of the buffer. 4162 return true; 4163 } 4164 } 4165 p++; 4166 break; 4167 } 4168 default : 4169 *b++ = '%'; 4170 } 4171 } else { 4172 *b++ = *p++; 4173 } 4174 } 4175 *b = '\0'; 4176 return (p == src_end); // return false if not all of the source was copied 4177} 4178