arguments.cpp revision 1879:f95d63e2154a
1/* 2 * Copyright (c) 1997, 2010, 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/javaAssertions.hpp" 27#include "compiler/compilerOracle.hpp" 28#include "memory/allocation.inline.hpp" 29#include "memory/cardTableRS.hpp" 30#include "memory/referenceProcessor.hpp" 31#include "memory/universe.inline.hpp" 32#include "oops/oop.inline.hpp" 33#include "prims/jvmtiExport.hpp" 34#include "runtime/arguments.hpp" 35#include "runtime/globals_extension.hpp" 36#include "runtime/java.hpp" 37#include "services/management.hpp" 38#include "utilities/defaultStream.hpp" 39#include "utilities/taskqueue.hpp" 40#ifdef TARGET_ARCH_x86 41# include "vm_version_x86.hpp" 42#endif 43#ifdef TARGET_ARCH_sparc 44# include "vm_version_sparc.hpp" 45#endif 46#ifdef TARGET_ARCH_zero 47# include "vm_version_zero.hpp" 48#endif 49#ifdef TARGET_OS_FAMILY_linux 50# include "os_linux.inline.hpp" 51#endif 52#ifdef TARGET_OS_FAMILY_solaris 53# include "os_solaris.inline.hpp" 54#endif 55#ifdef TARGET_OS_FAMILY_windows 56# include "os_windows.inline.hpp" 57#endif 58#ifndef SERIALGC 59#include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 60#endif 61 62#define DEFAULT_VENDOR_URL_BUG "http://java.sun.com/webapps/bugreport/crash.jsp" 63#define DEFAULT_JAVA_LAUNCHER "generic" 64 65char** Arguments::_jvm_flags_array = NULL; 66int Arguments::_num_jvm_flags = 0; 67char** Arguments::_jvm_args_array = NULL; 68int Arguments::_num_jvm_args = 0; 69char* Arguments::_java_command = NULL; 70SystemProperty* Arguments::_system_properties = NULL; 71const char* Arguments::_gc_log_filename = NULL; 72bool Arguments::_has_profile = false; 73bool Arguments::_has_alloc_profile = false; 74uintx Arguments::_min_heap_size = 0; 75Arguments::Mode Arguments::_mode = _mixed; 76bool Arguments::_java_compiler = false; 77bool Arguments::_xdebug_mode = false; 78const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 79const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 80int Arguments::_sun_java_launcher_pid = -1; 81 82// These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 83bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 84bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 85bool Arguments::_BackgroundCompilation = BackgroundCompilation; 86bool Arguments::_ClipInlining = ClipInlining; 87 88char* Arguments::SharedArchivePath = NULL; 89 90AgentLibraryList Arguments::_libraryList; 91AgentLibraryList Arguments::_agentList; 92 93abort_hook_t Arguments::_abort_hook = NULL; 94exit_hook_t Arguments::_exit_hook = NULL; 95vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 96 97 98SystemProperty *Arguments::_java_ext_dirs = NULL; 99SystemProperty *Arguments::_java_endorsed_dirs = NULL; 100SystemProperty *Arguments::_sun_boot_library_path = NULL; 101SystemProperty *Arguments::_java_library_path = NULL; 102SystemProperty *Arguments::_java_home = NULL; 103SystemProperty *Arguments::_java_class_path = NULL; 104SystemProperty *Arguments::_sun_boot_class_path = NULL; 105 106char* Arguments::_meta_index_path = NULL; 107char* Arguments::_meta_index_dir = NULL; 108 109static bool force_client_mode = false; 110 111// Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 112 113static bool match_option(const JavaVMOption *option, const char* name, 114 const char** tail) { 115 int len = (int)strlen(name); 116 if (strncmp(option->optionString, name, len) == 0) { 117 *tail = option->optionString + len; 118 return true; 119 } else { 120 return false; 121 } 122} 123 124static void logOption(const char* opt) { 125 if (PrintVMOptions) { 126 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 127 } 128} 129 130// Process java launcher properties. 131void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 132 // See if sun.java.launcher or sun.java.launcher.pid is defined. 133 // Must do this before setting up other system properties, 134 // as some of them may depend on launcher type. 135 for (int index = 0; index < args->nOptions; index++) { 136 const JavaVMOption* option = args->options + index; 137 const char* tail; 138 139 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 140 process_java_launcher_argument(tail, option->extraInfo); 141 continue; 142 } 143 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 144 _sun_java_launcher_pid = atoi(tail); 145 continue; 146 } 147 } 148} 149 150// Initialize system properties key and value. 151void Arguments::init_system_properties() { 152 153 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 154 "Java Virtual Machine Specification", false)); 155 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 156 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 157 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 158 159 // following are JVMTI agent writeable properties. 160 // Properties values are set to NULL and they are 161 // os specific they are initialized in os::init_system_properties_values(). 162 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 163 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 164 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 165 _java_library_path = new SystemProperty("java.library.path", NULL, true); 166 _java_home = new SystemProperty("java.home", NULL, true); 167 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 168 169 _java_class_path = new SystemProperty("java.class.path", "", true); 170 171 // Add to System Property list. 172 PropertyList_add(&_system_properties, _java_ext_dirs); 173 PropertyList_add(&_system_properties, _java_endorsed_dirs); 174 PropertyList_add(&_system_properties, _sun_boot_library_path); 175 PropertyList_add(&_system_properties, _java_library_path); 176 PropertyList_add(&_system_properties, _java_home); 177 PropertyList_add(&_system_properties, _java_class_path); 178 PropertyList_add(&_system_properties, _sun_boot_class_path); 179 180 // Set OS specific system properties values 181 os::init_system_properties_values(); 182} 183 184 185 // Update/Initialize System properties after JDK version number is known 186void Arguments::init_version_specific_system_properties() { 187 enum { bufsz = 16 }; 188 char buffer[bufsz]; 189 const char* spec_vendor = "Sun Microsystems Inc."; 190 uint32_t spec_version = 0; 191 192 if (JDK_Version::is_gte_jdk17x_version()) { 193 spec_vendor = "Oracle Corporation"; 194 spec_version = JDK_Version::current().major_version(); 195 } 196 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 197 198 PropertyList_add(&_system_properties, 199 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 200 PropertyList_add(&_system_properties, 201 new SystemProperty("java.vm.specification.version", buffer, false)); 202 PropertyList_add(&_system_properties, 203 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 204} 205 206/** 207 * Provide a slightly more user-friendly way of eliminating -XX flags. 208 * When a flag is eliminated, it can be added to this list in order to 209 * continue accepting this flag on the command-line, while issuing a warning 210 * and ignoring the value. Once the JDK version reaches the 'accept_until' 211 * limit, we flatly refuse to admit the existence of the flag. This allows 212 * a flag to die correctly over JDK releases using HSX. 213 */ 214typedef struct { 215 const char* name; 216 JDK_Version obsoleted_in; // when the flag went away 217 JDK_Version accept_until; // which version to start denying the existence 218} ObsoleteFlag; 219 220static ObsoleteFlag obsolete_jvm_flags[] = { 221 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 222 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 223 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 224 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 225 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 226 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 227 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 228 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 229 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 230 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 231 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 232 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 233 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 234 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 235 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 236 { "DefaultInitialRAMFraction", 237 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 238 { "UseDepthFirstScavengeOrder", 239 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 240 { "HandlePromotionFailure", 241 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 242 { "MaxLiveObjectEvacuationRatio", 243 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 244 { NULL, JDK_Version(0), JDK_Version(0) } 245}; 246 247// Returns true if the flag is obsolete and fits into the range specified 248// for being ignored. In the case that the flag is ignored, the 'version' 249// value is filled in with the version number when the flag became 250// obsolete so that that value can be displayed to the user. 251bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 252 int i = 0; 253 assert(version != NULL, "Must provide a version buffer"); 254 while (obsolete_jvm_flags[i].name != NULL) { 255 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 256 // <flag>=xxx form 257 // [-|+]<flag> form 258 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 259 ((s[0] == '+' || s[0] == '-') && 260 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 261 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 262 *version = flag_status.obsoleted_in; 263 return true; 264 } 265 } 266 i++; 267 } 268 return false; 269} 270 271// Constructs the system class path (aka boot class path) from the following 272// components, in order: 273// 274// prefix // from -Xbootclasspath/p:... 275// endorsed // the expansion of -Djava.endorsed.dirs=... 276// base // from os::get_system_properties() or -Xbootclasspath= 277// suffix // from -Xbootclasspath/a:... 278// 279// java.endorsed.dirs is a list of directories; any jar or zip files in the 280// directories are added to the sysclasspath just before the base. 281// 282// This could be AllStatic, but it isn't needed after argument processing is 283// complete. 284class SysClassPath: public StackObj { 285public: 286 SysClassPath(const char* base); 287 ~SysClassPath(); 288 289 inline void set_base(const char* base); 290 inline void add_prefix(const char* prefix); 291 inline void add_suffix_to_prefix(const char* suffix); 292 inline void add_suffix(const char* suffix); 293 inline void reset_path(const char* base); 294 295 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 296 // property. Must be called after all command-line arguments have been 297 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 298 // combined_path(). 299 void expand_endorsed(); 300 301 inline const char* get_base() const { return _items[_scp_base]; } 302 inline const char* get_prefix() const { return _items[_scp_prefix]; } 303 inline const char* get_suffix() const { return _items[_scp_suffix]; } 304 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 305 306 // Combine all the components into a single c-heap-allocated string; caller 307 // must free the string if/when no longer needed. 308 char* combined_path(); 309 310private: 311 // Utility routines. 312 static char* add_to_path(const char* path, const char* str, bool prepend); 313 static char* add_jars_to_path(char* path, const char* directory); 314 315 inline void reset_item_at(int index); 316 317 // Array indices for the items that make up the sysclasspath. All except the 318 // base are allocated in the C heap and freed by this class. 319 enum { 320 _scp_prefix, // from -Xbootclasspath/p:... 321 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 322 _scp_base, // the default sysclasspath 323 _scp_suffix, // from -Xbootclasspath/a:... 324 _scp_nitems // the number of items, must be last. 325 }; 326 327 const char* _items[_scp_nitems]; 328 DEBUG_ONLY(bool _expansion_done;) 329}; 330 331SysClassPath::SysClassPath(const char* base) { 332 memset(_items, 0, sizeof(_items)); 333 _items[_scp_base] = base; 334 DEBUG_ONLY(_expansion_done = false;) 335} 336 337SysClassPath::~SysClassPath() { 338 // Free everything except the base. 339 for (int i = 0; i < _scp_nitems; ++i) { 340 if (i != _scp_base) reset_item_at(i); 341 } 342 DEBUG_ONLY(_expansion_done = false;) 343} 344 345inline void SysClassPath::set_base(const char* base) { 346 _items[_scp_base] = base; 347} 348 349inline void SysClassPath::add_prefix(const char* prefix) { 350 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 351} 352 353inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 354 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 355} 356 357inline void SysClassPath::add_suffix(const char* suffix) { 358 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 359} 360 361inline void SysClassPath::reset_item_at(int index) { 362 assert(index < _scp_nitems && index != _scp_base, "just checking"); 363 if (_items[index] != NULL) { 364 FREE_C_HEAP_ARRAY(char, _items[index]); 365 _items[index] = NULL; 366 } 367} 368 369inline void SysClassPath::reset_path(const char* base) { 370 // Clear the prefix and suffix. 371 reset_item_at(_scp_prefix); 372 reset_item_at(_scp_suffix); 373 set_base(base); 374} 375 376//------------------------------------------------------------------------------ 377 378void SysClassPath::expand_endorsed() { 379 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 380 381 const char* path = Arguments::get_property("java.endorsed.dirs"); 382 if (path == NULL) { 383 path = Arguments::get_endorsed_dir(); 384 assert(path != NULL, "no default for java.endorsed.dirs"); 385 } 386 387 char* expanded_path = NULL; 388 const char separator = *os::path_separator(); 389 const char* const end = path + strlen(path); 390 while (path < end) { 391 const char* tmp_end = strchr(path, separator); 392 if (tmp_end == NULL) { 393 expanded_path = add_jars_to_path(expanded_path, path); 394 path = end; 395 } else { 396 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1); 397 memcpy(dirpath, path, tmp_end - path); 398 dirpath[tmp_end - path] = '\0'; 399 expanded_path = add_jars_to_path(expanded_path, dirpath); 400 FREE_C_HEAP_ARRAY(char, dirpath); 401 path = tmp_end + 1; 402 } 403 } 404 _items[_scp_endorsed] = expanded_path; 405 DEBUG_ONLY(_expansion_done = true;) 406} 407 408// Combine the bootclasspath elements, some of which may be null, into a single 409// c-heap-allocated string. 410char* SysClassPath::combined_path() { 411 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 412 assert(_expansion_done, "must call expand_endorsed() first."); 413 414 size_t lengths[_scp_nitems]; 415 size_t total_len = 0; 416 417 const char separator = *os::path_separator(); 418 419 // Get the lengths. 420 int i; 421 for (i = 0; i < _scp_nitems; ++i) { 422 if (_items[i] != NULL) { 423 lengths[i] = strlen(_items[i]); 424 // Include space for the separator char (or a NULL for the last item). 425 total_len += lengths[i] + 1; 426 } 427 } 428 assert(total_len > 0, "empty sysclasspath not allowed"); 429 430 // Copy the _items to a single string. 431 char* cp = NEW_C_HEAP_ARRAY(char, total_len); 432 char* cp_tmp = cp; 433 for (i = 0; i < _scp_nitems; ++i) { 434 if (_items[i] != NULL) { 435 memcpy(cp_tmp, _items[i], lengths[i]); 436 cp_tmp += lengths[i]; 437 *cp_tmp++ = separator; 438 } 439 } 440 *--cp_tmp = '\0'; // Replace the extra separator. 441 return cp; 442} 443 444// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 445char* 446SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 447 char *cp; 448 449 assert(str != NULL, "just checking"); 450 if (path == NULL) { 451 size_t len = strlen(str) + 1; 452 cp = NEW_C_HEAP_ARRAY(char, len); 453 memcpy(cp, str, len); // copy the trailing null 454 } else { 455 const char separator = *os::path_separator(); 456 size_t old_len = strlen(path); 457 size_t str_len = strlen(str); 458 size_t len = old_len + str_len + 2; 459 460 if (prepend) { 461 cp = NEW_C_HEAP_ARRAY(char, len); 462 char* cp_tmp = cp; 463 memcpy(cp_tmp, str, str_len); 464 cp_tmp += str_len; 465 *cp_tmp = separator; 466 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 467 FREE_C_HEAP_ARRAY(char, path); 468 } else { 469 cp = REALLOC_C_HEAP_ARRAY(char, path, len); 470 char* cp_tmp = cp + old_len; 471 *cp_tmp = separator; 472 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 473 } 474 } 475 return cp; 476} 477 478// Scan the directory and append any jar or zip files found to path. 479// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 480char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 481 DIR* dir = os::opendir(directory); 482 if (dir == NULL) return path; 483 484 char dir_sep[2] = { '\0', '\0' }; 485 size_t directory_len = strlen(directory); 486 const char fileSep = *os::file_separator(); 487 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 488 489 /* Scan the directory for jars/zips, appending them to path. */ 490 struct dirent *entry; 491 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory)); 492 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 493 const char* name = entry->d_name; 494 const char* ext = name + strlen(name) - 4; 495 bool isJarOrZip = ext > name && 496 (os::file_name_strcmp(ext, ".jar") == 0 || 497 os::file_name_strcmp(ext, ".zip") == 0); 498 if (isJarOrZip) { 499 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name)); 500 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 501 path = add_to_path(path, jarpath, false); 502 FREE_C_HEAP_ARRAY(char, jarpath); 503 } 504 } 505 FREE_C_HEAP_ARRAY(char, dbuf); 506 os::closedir(dir); 507 return path; 508} 509 510// Parses a memory size specification string. 511static bool atomull(const char *s, julong* result) { 512 julong n = 0; 513 int args_read = sscanf(s, os::julong_format_specifier(), &n); 514 if (args_read != 1) { 515 return false; 516 } 517 while (*s != '\0' && isdigit(*s)) { 518 s++; 519 } 520 // 4705540: illegal if more characters are found after the first non-digit 521 if (strlen(s) > 1) { 522 return false; 523 } 524 switch (*s) { 525 case 'T': case 't': 526 *result = n * G * K; 527 // Check for overflow. 528 if (*result/((julong)G * K) != n) return false; 529 return true; 530 case 'G': case 'g': 531 *result = n * G; 532 if (*result/G != n) return false; 533 return true; 534 case 'M': case 'm': 535 *result = n * M; 536 if (*result/M != n) return false; 537 return true; 538 case 'K': case 'k': 539 *result = n * K; 540 if (*result/K != n) return false; 541 return true; 542 case '\0': 543 *result = n; 544 return true; 545 default: 546 return false; 547 } 548} 549 550Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 551 if (size < min_size) return arg_too_small; 552 // Check that size will fit in a size_t (only relevant on 32-bit) 553 if (size > max_uintx) return arg_too_big; 554 return arg_in_range; 555} 556 557// Describe an argument out of range error 558void Arguments::describe_range_error(ArgsRange errcode) { 559 switch(errcode) { 560 case arg_too_big: 561 jio_fprintf(defaultStream::error_stream(), 562 "The specified size exceeds the maximum " 563 "representable size.\n"); 564 break; 565 case arg_too_small: 566 case arg_unreadable: 567 case arg_in_range: 568 // do nothing for now 569 break; 570 default: 571 ShouldNotReachHere(); 572 } 573} 574 575static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) { 576 return CommandLineFlags::boolAtPut(name, &value, origin); 577} 578 579static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 580 double v; 581 if (sscanf(value, "%lf", &v) != 1) { 582 return false; 583 } 584 585 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 586 return true; 587 } 588 return false; 589} 590 591static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 592 julong v; 593 intx intx_v; 594 bool is_neg = false; 595 // Check the sign first since atomull() parses only unsigned values. 596 if (*value == '-') { 597 if (!CommandLineFlags::intxAt(name, &intx_v)) { 598 return false; 599 } 600 value++; 601 is_neg = true; 602 } 603 if (!atomull(value, &v)) { 604 return false; 605 } 606 intx_v = (intx) v; 607 if (is_neg) { 608 intx_v = -intx_v; 609 } 610 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 611 return true; 612 } 613 uintx uintx_v = (uintx) v; 614 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 615 return true; 616 } 617 uint64_t uint64_t_v = (uint64_t) v; 618 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 619 return true; 620 } 621 return false; 622} 623 624static bool set_string_flag(char* name, const char* value, FlagValueOrigin 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, FlagValueOrigin 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); 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, FlagValueOrigin 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 "[-kmgtKMGT0123456789]" 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 index = *count; 727 728 // expand the array and add arg to the last element 729 (*count)++; 730 if (*bldarray == NULL) { 731 *bldarray = NEW_C_HEAP_ARRAY(char*, *count); 732 } else { 733 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count); 734 } 735 (*bldarray)[index] = strdup(arg); 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 st->print_cr("Launcher Type: %s", _sun_java_launcher); 775} 776 777void Arguments::print_jvm_flags_on(outputStream* st) { 778 if (_num_jvm_flags > 0) { 779 for (int i=0; i < _num_jvm_flags; i++) { 780 st->print("%s ", _jvm_flags_array[i]); 781 } 782 st->print_cr(""); 783 } 784} 785 786void Arguments::print_jvm_args_on(outputStream* st) { 787 if (_num_jvm_args > 0) { 788 for (int i=0; i < _num_jvm_args; i++) { 789 st->print("%s ", _jvm_args_array[i]); 790 } 791 st->print_cr(""); 792 } 793} 794 795bool Arguments::process_argument(const char* arg, 796 jboolean ignore_unrecognized, FlagValueOrigin origin) { 797 798 JDK_Version since = JDK_Version(); 799 800 if (parse_argument(arg, origin)) { 801 // do nothing 802 } else if (is_newly_obsolete(arg, &since)) { 803 enum { bufsize = 256 }; 804 char buffer[bufsize]; 805 since.to_string(buffer, bufsize); 806 jio_fprintf(defaultStream::error_stream(), 807 "Warning: The flag %s has been EOL'd as of %s and will" 808 " be ignored\n", arg, buffer); 809 } else { 810 if (!ignore_unrecognized) { 811 jio_fprintf(defaultStream::error_stream(), 812 "Unrecognized VM option '%s'\n", arg); 813 // allow for commandline "commenting out" options like -XX:#+Verbose 814 if (strlen(arg) == 0 || arg[0] != '#') { 815 return false; 816 } 817 } 818 } 819 return true; 820} 821 822bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 823 FILE* stream = fopen(file_name, "rb"); 824 if (stream == NULL) { 825 if (should_exist) { 826 jio_fprintf(defaultStream::error_stream(), 827 "Could not open settings file %s\n", file_name); 828 return false; 829 } else { 830 return true; 831 } 832 } 833 834 char token[1024]; 835 int pos = 0; 836 837 bool in_white_space = true; 838 bool in_comment = false; 839 bool in_quote = false; 840 char quote_c = 0; 841 bool result = true; 842 843 int c = getc(stream); 844 while(c != EOF) { 845 if (in_white_space) { 846 if (in_comment) { 847 if (c == '\n') in_comment = false; 848 } else { 849 if (c == '#') in_comment = true; 850 else if (!isspace(c)) { 851 in_white_space = false; 852 token[pos++] = c; 853 } 854 } 855 } else { 856 if (c == '\n' || (!in_quote && isspace(c))) { 857 // token ends at newline, or at unquoted whitespace 858 // this allows a way to include spaces in string-valued options 859 token[pos] = '\0'; 860 logOption(token); 861 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 862 build_jvm_flags(token); 863 pos = 0; 864 in_white_space = true; 865 in_quote = false; 866 } else if (!in_quote && (c == '\'' || c == '"')) { 867 in_quote = true; 868 quote_c = c; 869 } else if (in_quote && (c == quote_c)) { 870 in_quote = false; 871 } else { 872 token[pos++] = c; 873 } 874 } 875 c = getc(stream); 876 } 877 if (pos > 0) { 878 token[pos] = '\0'; 879 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 880 build_jvm_flags(token); 881 } 882 fclose(stream); 883 return result; 884} 885 886//============================================================================================================= 887// Parsing of properties (-D) 888 889const char* Arguments::get_property(const char* key) { 890 return PropertyList_get_value(system_properties(), key); 891} 892 893bool Arguments::add_property(const char* prop) { 894 const char* eq = strchr(prop, '='); 895 char* key; 896 // ns must be static--its address may be stored in a SystemProperty object. 897 const static char ns[1] = {0}; 898 char* value = (char *)ns; 899 900 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 901 key = AllocateHeap(key_len + 1, "add_property"); 902 strncpy(key, prop, key_len); 903 key[key_len] = '\0'; 904 905 if (eq != NULL) { 906 size_t value_len = strlen(prop) - key_len - 1; 907 value = AllocateHeap(value_len + 1, "add_property"); 908 strncpy(value, &prop[key_len + 1], value_len + 1); 909 } 910 911 if (strcmp(key, "java.compiler") == 0) { 912 process_java_compiler_argument(value); 913 FreeHeap(key); 914 if (eq != NULL) { 915 FreeHeap(value); 916 } 917 return true; 918 } else if (strcmp(key, "sun.java.command") == 0) { 919 _java_command = value; 920 921 // don't add this property to the properties exposed to the java application 922 FreeHeap(key); 923 return true; 924 } else if (strcmp(key, "sun.java.launcher.pid") == 0) { 925 // launcher.pid property is private and is processed 926 // in process_sun_java_launcher_properties(); 927 // the sun.java.launcher property is passed on to the java application 928 FreeHeap(key); 929 if (eq != NULL) { 930 FreeHeap(value); 931 } 932 return true; 933 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 934 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 935 // its value without going through the property list or making a Java call. 936 _java_vendor_url_bug = value; 937 } else if (strcmp(key, "sun.boot.library.path") == 0) { 938 PropertyList_unique_add(&_system_properties, key, value, true); 939 return true; 940 } 941 // Create new property and add at the end of the list 942 PropertyList_unique_add(&_system_properties, key, value); 943 return true; 944} 945 946//=========================================================================================================== 947// Setting int/mixed/comp mode flags 948 949void Arguments::set_mode_flags(Mode mode) { 950 // Set up default values for all flags. 951 // If you add a flag to any of the branches below, 952 // add a default value for it here. 953 set_java_compiler(false); 954 _mode = mode; 955 956 // Ensure Agent_OnLoad has the correct initial values. 957 // This may not be the final mode; mode may change later in onload phase. 958 PropertyList_unique_add(&_system_properties, "java.vm.info", 959 (char*)Abstract_VM_Version::vm_info_string(), false); 960 961 UseInterpreter = true; 962 UseCompiler = true; 963 UseLoopCounter = true; 964 965 // Default values may be platform/compiler dependent - 966 // use the saved values 967 ClipInlining = Arguments::_ClipInlining; 968 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 969 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 970 BackgroundCompilation = Arguments::_BackgroundCompilation; 971 972 // Change from defaults based on mode 973 switch (mode) { 974 default: 975 ShouldNotReachHere(); 976 break; 977 case _int: 978 UseCompiler = false; 979 UseLoopCounter = false; 980 AlwaysCompileLoopMethods = false; 981 UseOnStackReplacement = false; 982 break; 983 case _mixed: 984 // same as default 985 break; 986 case _comp: 987 UseInterpreter = false; 988 BackgroundCompilation = false; 989 ClipInlining = false; 990 break; 991 } 992} 993 994// Conflict: required to use shared spaces (-Xshare:on), but 995// incompatible command line options were chosen. 996 997static void no_shared_spaces() { 998 if (RequireSharedSpaces) { 999 jio_fprintf(defaultStream::error_stream(), 1000 "Class data sharing is inconsistent with other specified options.\n"); 1001 vm_exit_during_initialization("Unable to use shared archive.", NULL); 1002 } else { 1003 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1004 } 1005} 1006 1007void Arguments::check_compressed_oops_compat() { 1008#ifdef _LP64 1009 assert(UseCompressedOops, "Precondition"); 1010# if defined(COMPILER1) && !defined(TIERED) 1011 // Until c1 supports compressed oops turn them off. 1012 FLAG_SET_DEFAULT(UseCompressedOops, false); 1013# else 1014 // Is it on by default or set on ergonomically 1015 bool is_on_by_default = FLAG_IS_DEFAULT(UseCompressedOops) || FLAG_IS_ERGO(UseCompressedOops); 1016 1017 // Tiered currently doesn't work with compressed oops 1018 if (TieredCompilation) { 1019 if (is_on_by_default) { 1020 FLAG_SET_DEFAULT(UseCompressedOops, false); 1021 return; 1022 } else { 1023 vm_exit_during_initialization( 1024 "Tiered compilation is not supported with compressed oops yet", NULL); 1025 } 1026 } 1027 1028 // If dumping an archive or forcing its use, disable compressed oops if possible 1029 if (DumpSharedSpaces || RequireSharedSpaces) { 1030 if (is_on_by_default) { 1031 FLAG_SET_DEFAULT(UseCompressedOops, false); 1032 return; 1033 } else { 1034 vm_exit_during_initialization( 1035 "Class Data Sharing is not supported with compressed oops yet", NULL); 1036 } 1037 } else if (UseSharedSpaces) { 1038 // UseSharedSpaces is on by default. With compressed oops, we turn it off. 1039 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1040 } 1041 1042# endif // defined(COMPILER1) && !defined(TIERED) 1043#endif // _LP64 1044} 1045 1046void Arguments::set_tiered_flags() { 1047 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1048 FLAG_SET_DEFAULT(CompilationPolicyChoice, 2); 1049 } 1050 if (CompilationPolicyChoice < 2) { 1051 vm_exit_during_initialization( 1052 "Incompatible compilation policy selected", NULL); 1053 } 1054 // Increase the code cache size - tiered compiles a lot more. 1055 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1056 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2); 1057 } 1058} 1059 1060#ifndef KERNEL 1061// If the user has chosen ParallelGCThreads > 0, we set UseParNewGC 1062// if it's not explictly set or unset. If the user has chosen 1063// UseParNewGC and not explicitly set ParallelGCThreads we 1064// set it, unless this is a single cpu machine. 1065void Arguments::set_parnew_gc_flags() { 1066 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1067 "control point invariant"); 1068 assert(UseParNewGC, "Error"); 1069 1070 // Turn off AdaptiveSizePolicy by default for parnew until it is 1071 // complete. 1072 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) { 1073 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1074 } 1075 1076 if (ParallelGCThreads == 0) { 1077 FLAG_SET_DEFAULT(ParallelGCThreads, 1078 Abstract_VM_Version::parallel_worker_threads()); 1079 if (ParallelGCThreads == 1) { 1080 FLAG_SET_DEFAULT(UseParNewGC, false); 1081 FLAG_SET_DEFAULT(ParallelGCThreads, 0); 1082 } 1083 } 1084 if (UseParNewGC) { 1085 // CDS doesn't work with ParNew yet 1086 no_shared_spaces(); 1087 1088 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1089 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1090 // we set them to 1024 and 1024. 1091 // See CR 6362902. 1092 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1093 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1094 } 1095 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1096 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1097 } 1098 1099 // AlwaysTenure flag should make ParNew promote all at first collection. 1100 // See CR 6362902. 1101 if (AlwaysTenure) { 1102 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0); 1103 } 1104 // When using compressed oops, we use local overflow stacks, 1105 // rather than using a global overflow list chained through 1106 // the klass word of the object's pre-image. 1107 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1108 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1109 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1110 } 1111 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1112 } 1113 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1114 } 1115} 1116 1117// Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1118// sparc/solaris for certain applications, but would gain from 1119// further optimization and tuning efforts, and would almost 1120// certainly gain from analysis of platform and environment. 1121void Arguments::set_cms_and_parnew_gc_flags() { 1122 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1123 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1124 1125 // If we are using CMS, we prefer to UseParNewGC, 1126 // unless explicitly forbidden. 1127 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1128 FLAG_SET_ERGO(bool, UseParNewGC, true); 1129 } 1130 1131 // Turn off AdaptiveSizePolicy by default for cms until it is 1132 // complete. 1133 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) { 1134 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1135 } 1136 1137 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1138 // as needed. 1139 if (UseParNewGC) { 1140 set_parnew_gc_flags(); 1141 } 1142 1143 // Now make adjustments for CMS 1144 size_t young_gen_per_worker; 1145 intx new_ratio; 1146 size_t min_new_default; 1147 intx tenuring_default; 1148 if (CMSUseOldDefaults) { // old defaults: "old" as of 6.0 1149 if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) { 1150 FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M); 1151 } 1152 young_gen_per_worker = 4*M; 1153 new_ratio = (intx)15; 1154 min_new_default = 4*M; 1155 tenuring_default = (intx)0; 1156 } else { // new defaults: "new" as of 6.0 1157 young_gen_per_worker = CMSYoungGenPerWorker; 1158 new_ratio = (intx)7; 1159 min_new_default = 16*M; 1160 tenuring_default = (intx)4; 1161 } 1162 1163 // Preferred young gen size for "short" pauses 1164 const uintx parallel_gc_threads = 1165 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1166 const size_t preferred_max_new_size_unaligned = 1167 ScaleForWordSize(young_gen_per_worker * parallel_gc_threads); 1168 const size_t preferred_max_new_size = 1169 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1170 1171 // Unless explicitly requested otherwise, size young gen 1172 // for "short" pauses ~ 4M*ParallelGCThreads 1173 1174 // If either MaxNewSize or NewRatio is set on the command line, 1175 // assume the user is trying to set the size of the young gen. 1176 1177 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1178 1179 // Set MaxNewSize to our calculated preferred_max_new_size unless 1180 // NewSize was set on the command line and it is larger than 1181 // preferred_max_new_size. 1182 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1183 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1184 } else { 1185 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1186 } 1187 if (PrintGCDetails && Verbose) { 1188 // Too early to use gclog_or_tty 1189 tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1190 } 1191 1192 // Unless explicitly requested otherwise, prefer a large 1193 // Old to Young gen size so as to shift the collection load 1194 // to the old generation concurrent collector 1195 1196 // If this is only guarded by FLAG_IS_DEFAULT(NewRatio) 1197 // then NewSize and OldSize may be calculated. That would 1198 // generally lead to some differences with ParNewGC for which 1199 // there was no obvious reason. Also limit to the case where 1200 // MaxNewSize has not been set. 1201 1202 FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio)); 1203 1204 // Code along this path potentially sets NewSize and OldSize 1205 1206 // Calculate the desired minimum size of the young gen but if 1207 // NewSize has been set on the command line, use it here since 1208 // it should be the final value. 1209 size_t min_new; 1210 if (FLAG_IS_DEFAULT(NewSize)) { 1211 min_new = align_size_up(ScaleForWordSize(min_new_default), 1212 os::vm_page_size()); 1213 } else { 1214 min_new = NewSize; 1215 } 1216 size_t prev_initial_size = InitialHeapSize; 1217 if (prev_initial_size != 0 && prev_initial_size < min_new + OldSize) { 1218 FLAG_SET_ERGO(uintx, InitialHeapSize, min_new + OldSize); 1219 // Currently minimum size and the initial heap sizes are the same. 1220 set_min_heap_size(InitialHeapSize); 1221 if (PrintGCDetails && Verbose) { 1222 warning("Initial heap size increased to " SIZE_FORMAT " M from " 1223 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.", 1224 InitialHeapSize/M, prev_initial_size/M); 1225 } 1226 } 1227 1228 // MaxHeapSize is aligned down in collectorPolicy 1229 size_t max_heap = 1230 align_size_down(MaxHeapSize, 1231 CardTableRS::ct_max_alignment_constraint()); 1232 1233 if (PrintGCDetails && Verbose) { 1234 // Too early to use gclog_or_tty 1235 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1236 " initial_heap_size: " SIZE_FORMAT 1237 " max_heap: " SIZE_FORMAT, 1238 min_heap_size(), InitialHeapSize, max_heap); 1239 } 1240 if (max_heap > min_new) { 1241 // Unless explicitly requested otherwise, make young gen 1242 // at least min_new, and at most preferred_max_new_size. 1243 if (FLAG_IS_DEFAULT(NewSize)) { 1244 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1245 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1246 if (PrintGCDetails && Verbose) { 1247 // Too early to use gclog_or_tty 1248 tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize); 1249 } 1250 } 1251 // Unless explicitly requested otherwise, size old gen 1252 // so that it's at least 3X of NewSize to begin with; 1253 // later NewRatio will decide how it grows; see above. 1254 if (FLAG_IS_DEFAULT(OldSize)) { 1255 if (max_heap > NewSize) { 1256 FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize)); 1257 if (PrintGCDetails && Verbose) { 1258 // Too early to use gclog_or_tty 1259 tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize); 1260 } 1261 } 1262 } 1263 } 1264 } 1265 // Unless explicitly requested otherwise, definitely 1266 // promote all objects surviving "tenuring_default" scavenges. 1267 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1268 FLAG_IS_DEFAULT(SurvivorRatio)) { 1269 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default); 1270 } 1271 // If we decided above (or user explicitly requested) 1272 // `promote all' (via MaxTenuringThreshold := 0), 1273 // prefer minuscule survivor spaces so as not to waste 1274 // space for (non-existent) survivors 1275 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1276 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio)); 1277 } 1278 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1279 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1280 // This is done in order to make ParNew+CMS configuration to work 1281 // with YoungPLABSize and OldPLABSize options. 1282 // See CR 6362902. 1283 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1284 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1285 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1286 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1287 // the value (either from the command line or ergonomics) of 1288 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1289 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1290 } else { 1291 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1292 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1293 // we'll let it to take precedence. 1294 jio_fprintf(defaultStream::error_stream(), 1295 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1296 " options are specified for the CMS collector." 1297 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1298 } 1299 } 1300 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1301 // OldPLAB sizing manually turned off: Use a larger default setting, 1302 // unless it was manually specified. This is because a too-low value 1303 // will slow down scavenges. 1304 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1305 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1306 } 1307 } 1308 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1309 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1310 // If either of the static initialization defaults have changed, note this 1311 // modification. 1312 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1313 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1314 } 1315 if (PrintGCDetails && Verbose) { 1316 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1317 MarkStackSize / K, MarkStackSizeMax / K); 1318 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1319 } 1320} 1321#endif // KERNEL 1322 1323void set_object_alignment() { 1324 // Object alignment. 1325 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1326 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1327 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1328 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1329 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1330 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1331 1332 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1333 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1334 1335 // Oop encoding heap max 1336 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1337 1338#ifndef KERNEL 1339 // Set CMS global values 1340 CompactibleFreeListSpace::set_cms_values(); 1341#endif // KERNEL 1342} 1343 1344bool verify_object_alignment() { 1345 // Object alignment. 1346 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1347 jio_fprintf(defaultStream::error_stream(), 1348 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1349 (int)ObjectAlignmentInBytes); 1350 return false; 1351 } 1352 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1353 jio_fprintf(defaultStream::error_stream(), 1354 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1355 (int)ObjectAlignmentInBytes, BytesPerLong); 1356 return false; 1357 } 1358 // It does not make sense to have big object alignment 1359 // since a space lost due to alignment will be greater 1360 // then a saved space from compressed oops. 1361 if ((int)ObjectAlignmentInBytes > 256) { 1362 jio_fprintf(defaultStream::error_stream(), 1363 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n", 1364 (int)ObjectAlignmentInBytes); 1365 return false; 1366 } 1367 // In case page size is very small. 1368 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1369 jio_fprintf(defaultStream::error_stream(), 1370 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n", 1371 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1372 return false; 1373 } 1374 return true; 1375} 1376 1377inline uintx max_heap_for_compressed_oops() { 1378 // Avoid sign flip. 1379 if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) { 1380 return 0; 1381 } 1382 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size()); 1383 NOT_LP64(ShouldNotReachHere(); return 0); 1384} 1385 1386bool Arguments::should_auto_select_low_pause_collector() { 1387 if (UseAutoGCSelectPolicy && 1388 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1389 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1390 if (PrintGCDetails) { 1391 // Cannot use gclog_or_tty yet. 1392 tty->print_cr("Automatic selection of the low pause collector" 1393 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1394 } 1395 return true; 1396 } 1397 return false; 1398} 1399 1400void Arguments::set_ergonomics_flags() { 1401 // Parallel GC is not compatible with sharing. If one specifies 1402 // that they want sharing explicitly, do not set ergonomics flags. 1403 if (DumpSharedSpaces || ForceSharedSpaces) { 1404 return; 1405 } 1406 1407 if (os::is_server_class_machine() && !force_client_mode ) { 1408 // If no other collector is requested explicitly, 1409 // let the VM select the collector based on 1410 // machine class and automatic selection policy. 1411 if (!UseSerialGC && 1412 !UseConcMarkSweepGC && 1413 !UseG1GC && 1414 !UseParNewGC && 1415 !DumpSharedSpaces && 1416 FLAG_IS_DEFAULT(UseParallelGC)) { 1417 if (should_auto_select_low_pause_collector()) { 1418 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1419 } else { 1420 FLAG_SET_ERGO(bool, UseParallelGC, true); 1421 } 1422 no_shared_spaces(); 1423 } 1424 } 1425 1426#ifndef ZERO 1427#ifdef _LP64 1428 // Check that UseCompressedOops can be set with the max heap size allocated 1429 // by ergonomics. 1430 if (MaxHeapSize <= max_heap_for_compressed_oops()) { 1431#if !defined(COMPILER1) || defined(TIERED) 1432 if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) { 1433 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1434 } 1435#endif 1436#ifdef _WIN64 1437 if (UseLargePages && UseCompressedOops) { 1438 // Cannot allocate guard pages for implicit checks in indexed addressing 1439 // mode, when large pages are specified on windows. 1440 // This flag could be switched ON if narrow oop base address is set to 0, 1441 // see code in Universe::initialize_heap(). 1442 Universe::set_narrow_oop_use_implicit_null_checks(false); 1443 } 1444#endif // _WIN64 1445 } else { 1446 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1447 warning("Max heap size too large for Compressed Oops"); 1448 FLAG_SET_DEFAULT(UseCompressedOops, false); 1449 } 1450 } 1451 // Also checks that certain machines are slower with compressed oops 1452 // in vm_version initialization code. 1453#endif // _LP64 1454#endif // !ZERO 1455} 1456 1457void Arguments::set_parallel_gc_flags() { 1458 assert(UseParallelGC || UseParallelOldGC, "Error"); 1459 // If parallel old was requested, automatically enable parallel scavenge. 1460 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) { 1461 FLAG_SET_DEFAULT(UseParallelGC, true); 1462 } 1463 1464 // If no heap maximum was requested explicitly, use some reasonable fraction 1465 // of the physical memory, up to a maximum of 1GB. 1466 if (UseParallelGC) { 1467 FLAG_SET_ERGO(uintx, ParallelGCThreads, 1468 Abstract_VM_Version::parallel_worker_threads()); 1469 1470 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1471 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1472 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1473 // See CR 6362902 for details. 1474 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1475 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1476 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1477 } 1478 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1479 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1480 } 1481 } 1482 1483 if (UseParallelOldGC) { 1484 // Par compact uses lower default values since they are treated as 1485 // minimums. These are different defaults because of the different 1486 // interpretation and are not ergonomically set. 1487 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1488 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1489 } 1490 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) { 1491 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5); 1492 } 1493 } 1494 } 1495} 1496 1497void Arguments::set_g1_gc_flags() { 1498 assert(UseG1GC, "Error"); 1499#ifdef COMPILER1 1500 FastTLABRefill = false; 1501#endif 1502 FLAG_SET_DEFAULT(ParallelGCThreads, 1503 Abstract_VM_Version::parallel_worker_threads()); 1504 if (ParallelGCThreads == 0) { 1505 FLAG_SET_DEFAULT(ParallelGCThreads, 1506 Abstract_VM_Version::parallel_worker_threads()); 1507 } 1508 no_shared_spaces(); 1509 1510 if (FLAG_IS_DEFAULT(MarkStackSize)) { 1511 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE); 1512 } 1513 if (PrintGCDetails && Verbose) { 1514 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1515 MarkStackSize / K, MarkStackSizeMax / K); 1516 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1517 } 1518 1519 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1520 // In G1, we want the default GC overhead goal to be higher than 1521 // say in PS. So we set it here to 10%. Otherwise the heap might 1522 // be expanded more aggressively than we would like it to. In 1523 // fact, even 10% seems to not be high enough in some cases 1524 // (especially small GC stress tests that the main thing they do 1525 // is allocation). We might consider increase it further. 1526 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1527 } 1528} 1529 1530void Arguments::set_heap_size() { 1531 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1532 // Deprecated flag 1533 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1534 } 1535 1536 const julong phys_mem = 1537 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1538 : (julong)MaxRAM; 1539 1540 // If the maximum heap size has not been set with -Xmx, 1541 // then set it as fraction of the size of physical memory, 1542 // respecting the maximum and minimum sizes of the heap. 1543 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1544 julong reasonable_max = phys_mem / MaxRAMFraction; 1545 1546 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1547 // Small physical memory, so use a minimum fraction of it for the heap 1548 reasonable_max = phys_mem / MinRAMFraction; 1549 } else { 1550 // Not-small physical memory, so require a heap at least 1551 // as large as MaxHeapSize 1552 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1553 } 1554 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1555 // Limit the heap size to ErgoHeapSizeLimit 1556 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1557 } 1558 if (UseCompressedOops) { 1559 // Limit the heap size to the maximum possible when using compressed oops 1560 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1561 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1562 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1563 // but it should be not less than default MaxHeapSize. 1564 max_coop_heap -= HeapBaseMinAddress; 1565 } 1566 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1567 } 1568 reasonable_max = os::allocatable_physical_memory(reasonable_max); 1569 1570 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1571 // An initial heap size was specified on the command line, 1572 // so be sure that the maximum size is consistent. Done 1573 // after call to allocatable_physical_memory because that 1574 // method might reduce the allocation size. 1575 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1576 } 1577 1578 if (PrintGCDetails && Verbose) { 1579 // Cannot use gclog_or_tty yet. 1580 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1581 } 1582 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1583 } 1584 1585 // If the initial_heap_size has not been set with InitialHeapSize 1586 // or -Xms, then set it as fraction of the size of physical memory, 1587 // respecting the maximum and minimum sizes of the heap. 1588 if (FLAG_IS_DEFAULT(InitialHeapSize)) { 1589 julong reasonable_minimum = (julong)(OldSize + NewSize); 1590 1591 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1592 1593 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum); 1594 1595 julong reasonable_initial = phys_mem / InitialRAMFraction; 1596 1597 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum); 1598 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1599 1600 reasonable_initial = os::allocatable_physical_memory(reasonable_initial); 1601 1602 if (PrintGCDetails && Verbose) { 1603 // Cannot use gclog_or_tty yet. 1604 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1605 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum); 1606 } 1607 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1608 set_min_heap_size((uintx)reasonable_minimum); 1609 } 1610} 1611 1612// This must be called after ergonomics because we want bytecode rewriting 1613// if the server compiler is used, or if UseSharedSpaces is disabled. 1614void Arguments::set_bytecode_flags() { 1615 // Better not attempt to store into a read-only space. 1616 if (UseSharedSpaces) { 1617 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1618 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1619 } 1620 1621 if (!RewriteBytecodes) { 1622 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1623 } 1624} 1625 1626// Aggressive optimization flags -XX:+AggressiveOpts 1627void Arguments::set_aggressive_opts_flags() { 1628#ifdef COMPILER2 1629 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1630 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1631 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1632 } 1633 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1634 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1635 } 1636 1637 // Feed the cache size setting into the JDK 1638 char buffer[1024]; 1639 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1640 add_property(buffer); 1641 } 1642 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1643 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1644 } 1645 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1646 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1647 } 1648 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeStringConcat)) { 1649 FLAG_SET_DEFAULT(OptimizeStringConcat, true); 1650 } 1651 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeFill)) { 1652 FLAG_SET_DEFAULT(OptimizeFill, true); 1653 } 1654#endif 1655 1656 if (AggressiveOpts) { 1657// Sample flag setting code 1658// if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1659// FLAG_SET_DEFAULT(EliminateZeroing, true); 1660// } 1661 } 1662} 1663 1664//=========================================================================================================== 1665// Parsing of java.compiler property 1666 1667void Arguments::process_java_compiler_argument(char* arg) { 1668 // For backwards compatibility, Djava.compiler=NONE or "" 1669 // causes us to switch to -Xint mode UNLESS -Xdebug 1670 // is also specified. 1671 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1672 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1673 } 1674} 1675 1676void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1677 _sun_java_launcher = strdup(launcher); 1678} 1679 1680bool Arguments::created_by_java_launcher() { 1681 assert(_sun_java_launcher != NULL, "property must have value"); 1682 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1683} 1684 1685//=========================================================================================================== 1686// Parsing of main arguments 1687 1688bool Arguments::verify_interval(uintx val, uintx min, 1689 uintx max, const char* name) { 1690 // Returns true iff value is in the inclusive interval [min..max] 1691 // false, otherwise. 1692 if (val >= min && val <= max) { 1693 return true; 1694 } 1695 jio_fprintf(defaultStream::error_stream(), 1696 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1697 " and " UINTX_FORMAT "\n", 1698 name, val, min, max); 1699 return false; 1700} 1701 1702bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1703 // Returns true if given value is greater than specified min threshold 1704 // false, otherwise. 1705 if (val >= min ) { 1706 return true; 1707 } 1708 jio_fprintf(defaultStream::error_stream(), 1709 "%s of " INTX_FORMAT " is invalid; must be greater than " INTX_FORMAT "\n", 1710 name, val, min); 1711 return false; 1712} 1713 1714bool Arguments::verify_percentage(uintx value, const char* name) { 1715 if (value <= 100) { 1716 return true; 1717 } 1718 jio_fprintf(defaultStream::error_stream(), 1719 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1720 name, value); 1721 return false; 1722} 1723 1724static void force_serial_gc() { 1725 FLAG_SET_DEFAULT(UseSerialGC, true); 1726 FLAG_SET_DEFAULT(UseParNewGC, false); 1727 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false); 1728 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 1729 FLAG_SET_DEFAULT(UseParallelGC, false); 1730 FLAG_SET_DEFAULT(UseParallelOldGC, false); 1731 FLAG_SET_DEFAULT(UseG1GC, false); 1732} 1733 1734static bool verify_serial_gc_flags() { 1735 return (UseSerialGC && 1736 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1737 UseParallelGC || UseParallelOldGC)); 1738} 1739 1740// Check consistency of GC selection 1741bool Arguments::check_gc_consistency() { 1742 bool status = true; 1743 // Ensure that the user has not selected conflicting sets 1744 // of collectors. [Note: this check is merely a user convenience; 1745 // collectors over-ride each other so that only a non-conflicting 1746 // set is selected; however what the user gets is not what they 1747 // may have expected from the combination they asked for. It's 1748 // better to reduce user confusion by not allowing them to 1749 // select conflicting combinations. 1750 uint i = 0; 1751 if (UseSerialGC) i++; 1752 if (UseConcMarkSweepGC || UseParNewGC) i++; 1753 if (UseParallelGC || UseParallelOldGC) i++; 1754 if (UseG1GC) i++; 1755 if (i > 1) { 1756 jio_fprintf(defaultStream::error_stream(), 1757 "Conflicting collector combinations in option list; " 1758 "please refer to the release notes for the combinations " 1759 "allowed\n"); 1760 status = false; 1761 } 1762 1763 return status; 1764} 1765 1766// Check stack pages settings 1767bool Arguments::check_stack_pages() 1768{ 1769 bool status = true; 1770 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 1771 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 1772 // greater stack shadow pages can't generate instruction to bang stack 1773 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 1774 return status; 1775} 1776 1777// Check the consistency of vm_init_args 1778bool Arguments::check_vm_args_consistency() { 1779 // Method for adding checks for flag consistency. 1780 // The intent is to warn the user of all possible conflicts, 1781 // before returning an error. 1782 // Note: Needs platform-dependent factoring. 1783 bool status = true; 1784 1785#if ( (defined(COMPILER2) && defined(SPARC))) 1786 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init 1787 // on sparc doesn't require generation of a stub as is the case on, e.g., 1788 // x86. Normally, VM_Version_init must be called from init_globals in 1789 // init.cpp, which is called by the initial java thread *after* arguments 1790 // have been parsed. VM_Version_init gets called twice on sparc. 1791 extern void VM_Version_init(); 1792 VM_Version_init(); 1793 if (!VM_Version::has_v9()) { 1794 jio_fprintf(defaultStream::error_stream(), 1795 "V8 Machine detected, Server requires V9\n"); 1796 status = false; 1797 } 1798#endif /* COMPILER2 && SPARC */ 1799 1800 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 1801 // builds so the cost of stack banging can be measured. 1802#if (defined(PRODUCT) && defined(SOLARIS)) 1803 if (!UseBoundThreads && !UseStackBanging) { 1804 jio_fprintf(defaultStream::error_stream(), 1805 "-UseStackBanging conflicts with -UseBoundThreads\n"); 1806 1807 status = false; 1808 } 1809#endif 1810 1811 if (TLABRefillWasteFraction == 0) { 1812 jio_fprintf(defaultStream::error_stream(), 1813 "TLABRefillWasteFraction should be a denominator, " 1814 "not " SIZE_FORMAT "\n", 1815 TLABRefillWasteFraction); 1816 status = false; 1817 } 1818 1819 status = status && verify_percentage(AdaptiveSizePolicyWeight, 1820 "AdaptiveSizePolicyWeight"); 1821 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight"); 1822 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 1823 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 1824 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 1825 1826 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 1827 jio_fprintf(defaultStream::error_stream(), 1828 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1829 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 1830 MinHeapFreeRatio, MaxHeapFreeRatio); 1831 status = false; 1832 } 1833 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1834 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 1835 1836 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 1837 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 1838 } 1839 1840 if (UseParallelOldGC && ParallelOldGCSplitALot) { 1841 // Settings to encourage splitting. 1842 if (!FLAG_IS_CMDLINE(NewRatio)) { 1843 FLAG_SET_CMDLINE(intx, NewRatio, 2); 1844 } 1845 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 1846 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 1847 } 1848 } 1849 1850 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1851 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 1852 if (GCTimeLimit == 100) { 1853 // Turn off gc-overhead-limit-exceeded checks 1854 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 1855 } 1856 1857 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1858 1859 // Check whether user-specified sharing option conflicts with GC or page size. 1860 // Both sharing and large pages are enabled by default on some platforms; 1861 // large pages override sharing only if explicitly set on the command line. 1862 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode || 1863 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC || 1864 UseLargePages && FLAG_IS_CMDLINE(UseLargePages); 1865 if (cannot_share) { 1866 // Either force sharing on by forcing the other options off, or 1867 // force sharing off. 1868 if (DumpSharedSpaces || ForceSharedSpaces) { 1869 jio_fprintf(defaultStream::error_stream(), 1870 "Using Serial GC and default page size because of %s\n", 1871 ForceSharedSpaces ? "-Xshare:on" : "-Xshare:dump"); 1872 force_serial_gc(); 1873 FLAG_SET_DEFAULT(UseLargePages, false); 1874 } else { 1875 if (UseSharedSpaces && Verbose) { 1876 jio_fprintf(defaultStream::error_stream(), 1877 "Turning off use of shared archive because of " 1878 "choice of garbage collector or large pages\n"); 1879 } 1880 no_shared_spaces(); 1881 } 1882 } else if (UseLargePages && (UseSharedSpaces || DumpSharedSpaces)) { 1883 FLAG_SET_DEFAULT(UseLargePages, false); 1884 } 1885 1886 status = status && check_gc_consistency(); 1887 status = status && check_stack_pages(); 1888 1889 if (_has_alloc_profile) { 1890 if (UseParallelGC || UseParallelOldGC) { 1891 jio_fprintf(defaultStream::error_stream(), 1892 "error: invalid argument combination.\n" 1893 "Allocation profiling (-Xaprof) cannot be used together with " 1894 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n"); 1895 status = false; 1896 } 1897 if (UseConcMarkSweepGC) { 1898 jio_fprintf(defaultStream::error_stream(), 1899 "error: invalid argument combination.\n" 1900 "Allocation profiling (-Xaprof) cannot be used together with " 1901 "the CMS collector (-XX:+UseConcMarkSweepGC).\n"); 1902 status = false; 1903 } 1904 } 1905 1906 if (CMSIncrementalMode) { 1907 if (!UseConcMarkSweepGC) { 1908 jio_fprintf(defaultStream::error_stream(), 1909 "error: invalid argument combination.\n" 1910 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 1911 "selected in order\nto use CMSIncrementalMode.\n"); 1912 status = false; 1913 } else { 1914 status = status && verify_percentage(CMSIncrementalDutyCycle, 1915 "CMSIncrementalDutyCycle"); 1916 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 1917 "CMSIncrementalDutyCycleMin"); 1918 status = status && verify_percentage(CMSIncrementalSafetyFactor, 1919 "CMSIncrementalSafetyFactor"); 1920 status = status && verify_percentage(CMSIncrementalOffset, 1921 "CMSIncrementalOffset"); 1922 status = status && verify_percentage(CMSExpAvgFactor, 1923 "CMSExpAvgFactor"); 1924 // If it was not set on the command line, set 1925 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 1926 if (CMSInitiatingOccupancyFraction < 0) { 1927 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 1928 } 1929 } 1930 } 1931 1932 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 1933 // insists that we hold the requisite locks so that the iteration is 1934 // MT-safe. For the verification at start-up and shut-down, we don't 1935 // yet have a good way of acquiring and releasing these locks, 1936 // which are not visible at the CollectedHeap level. We want to 1937 // be able to acquire these locks and then do the iteration rather 1938 // than just disable the lock verification. This will be fixed under 1939 // bug 4788986. 1940 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 1941 if (VerifyGCStartAt == 0) { 1942 warning("Heap verification at start-up disabled " 1943 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1944 VerifyGCStartAt = 1; // Disable verification at start-up 1945 } 1946 if (VerifyBeforeExit) { 1947 warning("Heap verification at shutdown disabled " 1948 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1949 VerifyBeforeExit = false; // Disable verification at shutdown 1950 } 1951 } 1952 1953 // Note: only executed in non-PRODUCT mode 1954 if (!UseAsyncConcMarkSweepGC && 1955 (ExplicitGCInvokesConcurrent || 1956 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 1957 jio_fprintf(defaultStream::error_stream(), 1958 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts" 1959 " with -UseAsyncConcMarkSweepGC"); 1960 status = false; 1961 } 1962 1963 if (UseG1GC) { 1964 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 1965 "InitiatingHeapOccupancyPercent"); 1966 } 1967 1968 status = status && verify_interval(RefDiscoveryPolicy, 1969 ReferenceProcessor::DiscoveryPolicyMin, 1970 ReferenceProcessor::DiscoveryPolicyMax, 1971 "RefDiscoveryPolicy"); 1972 1973 // Limit the lower bound of this flag to 1 as it is used in a division 1974 // expression. 1975 status = status && verify_interval(TLABWasteTargetPercent, 1976 1, 100, "TLABWasteTargetPercent"); 1977 1978 status = status && verify_object_alignment(); 1979 1980 return status; 1981} 1982 1983bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 1984 const char* option_type) { 1985 if (ignore) return false; 1986 1987 const char* spacer = " "; 1988 if (option_type == NULL) { 1989 option_type = ++spacer; // Set both to the empty string. 1990 } 1991 1992 if (os::obsolete_option(option)) { 1993 jio_fprintf(defaultStream::error_stream(), 1994 "Obsolete %s%soption: %s\n", option_type, spacer, 1995 option->optionString); 1996 return false; 1997 } else { 1998 jio_fprintf(defaultStream::error_stream(), 1999 "Unrecognized %s%soption: %s\n", option_type, spacer, 2000 option->optionString); 2001 return true; 2002 } 2003} 2004 2005static const char* user_assertion_options[] = { 2006 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2007}; 2008 2009static const char* system_assertion_options[] = { 2010 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2011}; 2012 2013// Return true if any of the strings in null-terminated array 'names' matches. 2014// If tail_allowed is true, then the tail must begin with a colon; otherwise, 2015// the option must match exactly. 2016static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2017 bool tail_allowed) { 2018 for (/* empty */; *names != NULL; ++names) { 2019 if (match_option(option, *names, tail)) { 2020 if (**tail == '\0' || tail_allowed && **tail == ':') { 2021 return true; 2022 } 2023 } 2024 } 2025 return false; 2026} 2027 2028bool Arguments::parse_uintx(const char* value, 2029 uintx* uintx_arg, 2030 uintx min_size) { 2031 2032 // Check the sign first since atomull() parses only unsigned values. 2033 bool value_is_positive = !(*value == '-'); 2034 2035 if (value_is_positive) { 2036 julong n; 2037 bool good_return = atomull(value, &n); 2038 if (good_return) { 2039 bool above_minimum = n >= min_size; 2040 bool value_is_too_large = n > max_uintx; 2041 2042 if (above_minimum && !value_is_too_large) { 2043 *uintx_arg = n; 2044 return true; 2045 } 2046 } 2047 } 2048 return false; 2049} 2050 2051Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2052 julong* long_arg, 2053 julong min_size) { 2054 if (!atomull(s, long_arg)) return arg_unreadable; 2055 return check_memory_size(*long_arg, min_size); 2056} 2057 2058// Parse JavaVMInitArgs structure 2059 2060jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2061 // For components of the system classpath. 2062 SysClassPath scp(Arguments::get_sysclasspath()); 2063 bool scp_assembly_required = false; 2064 2065 // Save default settings for some mode flags 2066 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2067 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2068 Arguments::_ClipInlining = ClipInlining; 2069 Arguments::_BackgroundCompilation = BackgroundCompilation; 2070 2071 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2072 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2073 if (result != JNI_OK) { 2074 return result; 2075 } 2076 2077 // Parse JavaVMInitArgs structure passed in 2078 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE); 2079 if (result != JNI_OK) { 2080 return result; 2081 } 2082 2083 if (AggressiveOpts) { 2084 // Insert alt-rt.jar between user-specified bootclasspath 2085 // prefix and the default bootclasspath. os::set_boot_path() 2086 // uses meta_index_dir as the default bootclasspath directory. 2087 const char* altclasses_jar = "alt-rt.jar"; 2088 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 + 2089 strlen(altclasses_jar); 2090 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len); 2091 strcpy(altclasses_path, get_meta_index_dir()); 2092 strcat(altclasses_path, altclasses_jar); 2093 scp.add_suffix_to_prefix(altclasses_path); 2094 scp_assembly_required = true; 2095 FREE_C_HEAP_ARRAY(char, altclasses_path); 2096 } 2097 2098 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2099 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2100 if (result != JNI_OK) { 2101 return result; 2102 } 2103 2104 // Do final processing now that all arguments have been parsed 2105 result = finalize_vm_init_args(&scp, scp_assembly_required); 2106 if (result != JNI_OK) { 2107 return result; 2108 } 2109 2110 return JNI_OK; 2111} 2112 2113jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2114 SysClassPath* scp_p, 2115 bool* scp_assembly_required_p, 2116 FlagValueOrigin origin) { 2117 // Remaining part of option string 2118 const char* tail; 2119 2120 // iterate over arguments 2121 for (int index = 0; index < args->nOptions; index++) { 2122 bool is_absolute_path = false; // for -agentpath vs -agentlib 2123 2124 const JavaVMOption* option = args->options + index; 2125 2126 if (!match_option(option, "-Djava.class.path", &tail) && 2127 !match_option(option, "-Dsun.java.command", &tail) && 2128 !match_option(option, "-Dsun.java.launcher", &tail)) { 2129 2130 // add all jvm options to the jvm_args string. This string 2131 // is used later to set the java.vm.args PerfData string constant. 2132 // the -Djava.class.path and the -Dsun.java.command options are 2133 // omitted from jvm_args string as each have their own PerfData 2134 // string constant object. 2135 build_jvm_args(option->optionString); 2136 } 2137 2138 // -verbose:[class/gc/jni] 2139 if (match_option(option, "-verbose", &tail)) { 2140 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2141 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2142 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2143 } else if (!strcmp(tail, ":gc")) { 2144 FLAG_SET_CMDLINE(bool, PrintGC, true); 2145 } else if (!strcmp(tail, ":jni")) { 2146 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2147 } 2148 // -da / -ea / -disableassertions / -enableassertions 2149 // These accept an optional class/package name separated by a colon, e.g., 2150 // -da:java.lang.Thread. 2151 } else if (match_option(option, user_assertion_options, &tail, true)) { 2152 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2153 if (*tail == '\0') { 2154 JavaAssertions::setUserClassDefault(enable); 2155 } else { 2156 assert(*tail == ':', "bogus match by match_option()"); 2157 JavaAssertions::addOption(tail + 1, enable); 2158 } 2159 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2160 } else if (match_option(option, system_assertion_options, &tail, false)) { 2161 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2162 JavaAssertions::setSystemClassDefault(enable); 2163 // -bootclasspath: 2164 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2165 scp_p->reset_path(tail); 2166 *scp_assembly_required_p = true; 2167 // -bootclasspath/a: 2168 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2169 scp_p->add_suffix(tail); 2170 *scp_assembly_required_p = true; 2171 // -bootclasspath/p: 2172 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2173 scp_p->add_prefix(tail); 2174 *scp_assembly_required_p = true; 2175 // -Xrun 2176 } else if (match_option(option, "-Xrun", &tail)) { 2177 if (tail != NULL) { 2178 const char* pos = strchr(tail, ':'); 2179 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2180 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len); 2181 name[len] = '\0'; 2182 2183 char *options = NULL; 2184 if(pos != NULL) { 2185 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2186 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2); 2187 } 2188#ifdef JVMTI_KERNEL 2189 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2190 warning("profiling and debugging agents are not supported with Kernel VM"); 2191 } else 2192#endif // JVMTI_KERNEL 2193 add_init_library(name, options); 2194 } 2195 // -agentlib and -agentpath 2196 } else if (match_option(option, "-agentlib:", &tail) || 2197 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2198 if(tail != NULL) { 2199 const char* pos = strchr(tail, '='); 2200 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2201 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len); 2202 name[len] = '\0'; 2203 2204 char *options = NULL; 2205 if(pos != NULL) { 2206 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1); 2207 } 2208#ifdef JVMTI_KERNEL 2209 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2210 warning("profiling and debugging agents are not supported with Kernel VM"); 2211 } else 2212#endif // JVMTI_KERNEL 2213 add_init_agent(name, options, is_absolute_path); 2214 2215 } 2216 // -javaagent 2217 } else if (match_option(option, "-javaagent:", &tail)) { 2218 if(tail != NULL) { 2219 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail); 2220 add_init_agent("instrument", options, false); 2221 } 2222 // -Xnoclassgc 2223 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2224 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2225 // -Xincgc: i-CMS 2226 } else if (match_option(option, "-Xincgc", &tail)) { 2227 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2228 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2229 // -Xnoincgc: no i-CMS 2230 } else if (match_option(option, "-Xnoincgc", &tail)) { 2231 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2232 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2233 // -Xconcgc 2234 } else if (match_option(option, "-Xconcgc", &tail)) { 2235 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2236 // -Xnoconcgc 2237 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2238 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2239 // -Xbatch 2240 } else if (match_option(option, "-Xbatch", &tail)) { 2241 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2242 // -Xmn for compatibility with other JVM vendors 2243 } else if (match_option(option, "-Xmn", &tail)) { 2244 julong long_initial_eden_size = 0; 2245 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1); 2246 if (errcode != arg_in_range) { 2247 jio_fprintf(defaultStream::error_stream(), 2248 "Invalid initial eden size: %s\n", option->optionString); 2249 describe_range_error(errcode); 2250 return JNI_EINVAL; 2251 } 2252 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size); 2253 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size); 2254 // -Xms 2255 } else if (match_option(option, "-Xms", &tail)) { 2256 julong long_initial_heap_size = 0; 2257 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1); 2258 if (errcode != arg_in_range) { 2259 jio_fprintf(defaultStream::error_stream(), 2260 "Invalid initial heap size: %s\n", option->optionString); 2261 describe_range_error(errcode); 2262 return JNI_EINVAL; 2263 } 2264 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2265 // Currently the minimum size and the initial heap sizes are the same. 2266 set_min_heap_size(InitialHeapSize); 2267 // -Xmx 2268 } else if (match_option(option, "-Xmx", &tail)) { 2269 julong long_max_heap_size = 0; 2270 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2271 if (errcode != arg_in_range) { 2272 jio_fprintf(defaultStream::error_stream(), 2273 "Invalid maximum heap size: %s\n", option->optionString); 2274 describe_range_error(errcode); 2275 return JNI_EINVAL; 2276 } 2277 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2278 // Xmaxf 2279 } else if (match_option(option, "-Xmaxf", &tail)) { 2280 int maxf = (int)(atof(tail) * 100); 2281 if (maxf < 0 || maxf > 100) { 2282 jio_fprintf(defaultStream::error_stream(), 2283 "Bad max heap free percentage size: %s\n", 2284 option->optionString); 2285 return JNI_EINVAL; 2286 } else { 2287 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2288 } 2289 // Xminf 2290 } else if (match_option(option, "-Xminf", &tail)) { 2291 int minf = (int)(atof(tail) * 100); 2292 if (minf < 0 || minf > 100) { 2293 jio_fprintf(defaultStream::error_stream(), 2294 "Bad min heap free percentage size: %s\n", 2295 option->optionString); 2296 return JNI_EINVAL; 2297 } else { 2298 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2299 } 2300 // -Xss 2301 } else if (match_option(option, "-Xss", &tail)) { 2302 julong long_ThreadStackSize = 0; 2303 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2304 if (errcode != arg_in_range) { 2305 jio_fprintf(defaultStream::error_stream(), 2306 "Invalid thread stack size: %s\n", option->optionString); 2307 describe_range_error(errcode); 2308 return JNI_EINVAL; 2309 } 2310 // Internally track ThreadStackSize in units of 1024 bytes. 2311 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2312 round_to((int)long_ThreadStackSize, K) / K); 2313 // -Xoss 2314 } else if (match_option(option, "-Xoss", &tail)) { 2315 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2316 // -Xmaxjitcodesize 2317 } else if (match_option(option, "-Xmaxjitcodesize", &tail)) { 2318 julong long_ReservedCodeCacheSize = 0; 2319 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 2320 (size_t)InitialCodeCacheSize); 2321 if (errcode != arg_in_range) { 2322 jio_fprintf(defaultStream::error_stream(), 2323 "Invalid maximum code cache size: %s\n", 2324 option->optionString); 2325 describe_range_error(errcode); 2326 return JNI_EINVAL; 2327 } 2328 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2329 // -green 2330 } else if (match_option(option, "-green", &tail)) { 2331 jio_fprintf(defaultStream::error_stream(), 2332 "Green threads support not available\n"); 2333 return JNI_EINVAL; 2334 // -native 2335 } else if (match_option(option, "-native", &tail)) { 2336 // HotSpot always uses native threads, ignore silently for compatibility 2337 // -Xsqnopause 2338 } else if (match_option(option, "-Xsqnopause", &tail)) { 2339 // EVM option, ignore silently for compatibility 2340 // -Xrs 2341 } else if (match_option(option, "-Xrs", &tail)) { 2342 // Classic/EVM option, new functionality 2343 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2344 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2345 // change default internal VM signals used - lower case for back compat 2346 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2347 // -Xoptimize 2348 } else if (match_option(option, "-Xoptimize", &tail)) { 2349 // EVM option, ignore silently for compatibility 2350 // -Xprof 2351 } else if (match_option(option, "-Xprof", &tail)) { 2352#ifndef FPROF_KERNEL 2353 _has_profile = true; 2354#else // FPROF_KERNEL 2355 // do we have to exit? 2356 warning("Kernel VM does not support flat profiling."); 2357#endif // FPROF_KERNEL 2358 // -Xaprof 2359 } else if (match_option(option, "-Xaprof", &tail)) { 2360 _has_alloc_profile = true; 2361 // -Xconcurrentio 2362 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2363 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2364 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2365 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2366 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2367 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2368 2369 // -Xinternalversion 2370 } else if (match_option(option, "-Xinternalversion", &tail)) { 2371 jio_fprintf(defaultStream::output_stream(), "%s\n", 2372 VM_Version::internal_vm_info_string()); 2373 vm_exit(0); 2374#ifndef PRODUCT 2375 // -Xprintflags 2376 } else if (match_option(option, "-Xprintflags", &tail)) { 2377 CommandLineFlags::printFlags(); 2378 vm_exit(0); 2379#endif 2380 // -D 2381 } else if (match_option(option, "-D", &tail)) { 2382 if (!add_property(tail)) { 2383 return JNI_ENOMEM; 2384 } 2385 // Out of the box management support 2386 if (match_option(option, "-Dcom.sun.management", &tail)) { 2387 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2388 } 2389 // -Xint 2390 } else if (match_option(option, "-Xint", &tail)) { 2391 set_mode_flags(_int); 2392 // -Xmixed 2393 } else if (match_option(option, "-Xmixed", &tail)) { 2394 set_mode_flags(_mixed); 2395 // -Xcomp 2396 } else if (match_option(option, "-Xcomp", &tail)) { 2397 // for testing the compiler; turn off all flags that inhibit compilation 2398 set_mode_flags(_comp); 2399 2400 // -Xshare:dump 2401 } else if (match_option(option, "-Xshare:dump", &tail)) { 2402#ifdef TIERED 2403 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2404 set_mode_flags(_int); // Prevent compilation, which creates objects 2405#elif defined(COMPILER2) 2406 vm_exit_during_initialization( 2407 "Dumping a shared archive is not supported on the Server JVM.", NULL); 2408#elif defined(KERNEL) 2409 vm_exit_during_initialization( 2410 "Dumping a shared archive is not supported on the Kernel JVM.", NULL); 2411#else 2412 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2413 set_mode_flags(_int); // Prevent compilation, which creates objects 2414#endif 2415 // -Xshare:on 2416 } else if (match_option(option, "-Xshare:on", &tail)) { 2417 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2418 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2419#ifdef TIERED 2420 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true); 2421#endif // TIERED 2422 // -Xshare:auto 2423 } else if (match_option(option, "-Xshare:auto", &tail)) { 2424 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2425 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2426 // -Xshare:off 2427 } else if (match_option(option, "-Xshare:off", &tail)) { 2428 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2429 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2430 2431 // -Xverify 2432 } else if (match_option(option, "-Xverify", &tail)) { 2433 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2434 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2435 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2436 } else if (strcmp(tail, ":remote") == 0) { 2437 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2438 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2439 } else if (strcmp(tail, ":none") == 0) { 2440 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2441 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2442 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2443 return JNI_EINVAL; 2444 } 2445 // -Xdebug 2446 } else if (match_option(option, "-Xdebug", &tail)) { 2447 // note this flag has been used, then ignore 2448 set_xdebug_mode(true); 2449 // -Xnoagent 2450 } else if (match_option(option, "-Xnoagent", &tail)) { 2451 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2452 } else if (match_option(option, "-Xboundthreads", &tail)) { 2453 // Bind user level threads to kernel threads (Solaris only) 2454 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2455 } else if (match_option(option, "-Xloggc:", &tail)) { 2456 // Redirect GC output to the file. -Xloggc:<filename> 2457 // ostream_init_log(), when called will use this filename 2458 // to initialize a fileStream. 2459 _gc_log_filename = strdup(tail); 2460 FLAG_SET_CMDLINE(bool, PrintGC, true); 2461 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2462 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2463 2464 // JNI hooks 2465 } else if (match_option(option, "-Xcheck", &tail)) { 2466 if (!strcmp(tail, ":jni")) { 2467 CheckJNICalls = true; 2468 } else if (is_bad_option(option, args->ignoreUnrecognized, 2469 "check")) { 2470 return JNI_EINVAL; 2471 } 2472 } else if (match_option(option, "vfprintf", &tail)) { 2473 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2474 } else if (match_option(option, "exit", &tail)) { 2475 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2476 } else if (match_option(option, "abort", &tail)) { 2477 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2478 // -XX:+AggressiveHeap 2479 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2480 2481 // This option inspects the machine and attempts to set various 2482 // parameters to be optimal for long-running, memory allocation 2483 // intensive jobs. It is intended for machines with large 2484 // amounts of cpu and memory. 2485 2486 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2487 // VM, but we may not be able to represent the total physical memory 2488 // available (like having 8gb of memory on a box but using a 32bit VM). 2489 // Thus, we need to make sure we're using a julong for intermediate 2490 // calculations. 2491 julong initHeapSize; 2492 julong total_memory = os::physical_memory(); 2493 2494 if (total_memory < (julong)256*M) { 2495 jio_fprintf(defaultStream::error_stream(), 2496 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2497 vm_exit(1); 2498 } 2499 2500 // The heap size is half of available memory, or (at most) 2501 // all of possible memory less 160mb (leaving room for the OS 2502 // when using ISM). This is the maximum; because adaptive sizing 2503 // is turned on below, the actual space used may be smaller. 2504 2505 initHeapSize = MIN2(total_memory / (julong)2, 2506 total_memory - (julong)160*M); 2507 2508 // Make sure that if we have a lot of memory we cap the 32 bit 2509 // process space. The 64bit VM version of this function is a nop. 2510 initHeapSize = os::allocatable_physical_memory(initHeapSize); 2511 2512 // The perm gen is separate but contiguous with the 2513 // object heap (and is reserved with it) so subtract it 2514 // from the heap size. 2515 if (initHeapSize > MaxPermSize) { 2516 initHeapSize = initHeapSize - MaxPermSize; 2517 } else { 2518 warning("AggressiveHeap and MaxPermSize values may conflict"); 2519 } 2520 2521 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2522 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2523 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2524 // Currently the minimum size and the initial heap sizes are the same. 2525 set_min_heap_size(initHeapSize); 2526 } 2527 if (FLAG_IS_DEFAULT(NewSize)) { 2528 // Make the young generation 3/8ths of the total heap. 2529 FLAG_SET_CMDLINE(uintx, NewSize, 2530 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2531 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2532 } 2533 2534 FLAG_SET_DEFAULT(UseLargePages, true); 2535 2536 // Increase some data structure sizes for efficiency 2537 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2538 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2539 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2540 2541 // See the OldPLABSize comment below, but replace 'after promotion' 2542 // with 'after copying'. YoungPLABSize is the size of the survivor 2543 // space per-gc-thread buffers. The default is 4kw. 2544 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2545 2546 // OldPLABSize is the size of the buffers in the old gen that 2547 // UseParallelGC uses to promote live data that doesn't fit in the 2548 // survivor spaces. At any given time, there's one for each gc thread. 2549 // The default size is 1kw. These buffers are rarely used, since the 2550 // survivor spaces are usually big enough. For specjbb, however, there 2551 // are occasions when there's lots of live data in the young gen 2552 // and we end up promoting some of it. We don't have a definite 2553 // explanation for why bumping OldPLABSize helps, but the theory 2554 // is that a bigger PLAB results in retaining something like the 2555 // original allocation order after promotion, which improves mutator 2556 // locality. A minor effect may be that larger PLABs reduce the 2557 // number of PLAB allocation events during gc. The value of 8kw 2558 // was arrived at by experimenting with specjbb. 2559 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2560 2561 // CompilationPolicyChoice=0 causes the server compiler to adopt 2562 // a more conservative which-method-do-I-compile policy when one 2563 // of the counters maintained by the interpreter trips. The 2564 // result is reduced startup time and improved specjbb and 2565 // alacrity performance. Zero is the default, but we set it 2566 // explicitly here in case the default changes. 2567 // See runtime/compilationPolicy.*. 2568 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0); 2569 2570 // Enable parallel GC and adaptive generation sizing 2571 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2572 FLAG_SET_DEFAULT(ParallelGCThreads, 2573 Abstract_VM_Version::parallel_worker_threads()); 2574 2575 // Encourage steady state memory management 2576 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2577 2578 // This appears to improve mutator locality 2579 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2580 2581 // Get around early Solaris scheduling bug 2582 // (affinity vs other jobs on system) 2583 // but disallow DR and offlining (5008695). 2584 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 2585 2586 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 2587 // The last option must always win. 2588 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 2589 FLAG_SET_CMDLINE(bool, NeverTenure, true); 2590 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 2591 // The last option must always win. 2592 FLAG_SET_CMDLINE(bool, NeverTenure, false); 2593 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 2594 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 2595 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 2596 jio_fprintf(defaultStream::error_stream(), 2597 "Please use CMSClassUnloadingEnabled in place of " 2598 "CMSPermGenSweepingEnabled in the future\n"); 2599 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 2600 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 2601 jio_fprintf(defaultStream::error_stream(), 2602 "Please use -XX:+UseGCOverheadLimit in place of " 2603 "-XX:+UseGCTimeLimit in the future\n"); 2604 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 2605 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 2606 jio_fprintf(defaultStream::error_stream(), 2607 "Please use -XX:-UseGCOverheadLimit in place of " 2608 "-XX:-UseGCTimeLimit in the future\n"); 2609 // The TLE options are for compatibility with 1.3 and will be 2610 // removed without notice in a future release. These options 2611 // are not to be documented. 2612 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 2613 // No longer used. 2614 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 2615 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 2616 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 2617 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2618 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 2619 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 2620 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 2621 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 2622 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 2623 // No longer used. 2624 } else if (match_option(option, "-XX:TLESize=", &tail)) { 2625 julong long_tlab_size = 0; 2626 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 2627 if (errcode != arg_in_range) { 2628 jio_fprintf(defaultStream::error_stream(), 2629 "Invalid TLAB size: %s\n", option->optionString); 2630 describe_range_error(errcode); 2631 return JNI_EINVAL; 2632 } 2633 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 2634 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 2635 // No longer used. 2636 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 2637 FLAG_SET_CMDLINE(bool, UseTLAB, true); 2638 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 2639 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2640SOLARIS_ONLY( 2641 } else if (match_option(option, "-XX:+UsePermISM", &tail)) { 2642 warning("-XX:+UsePermISM is obsolete."); 2643 FLAG_SET_CMDLINE(bool, UseISM, true); 2644 } else if (match_option(option, "-XX:-UsePermISM", &tail)) { 2645 FLAG_SET_CMDLINE(bool, UseISM, false); 2646) 2647 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 2648 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 2649 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 2650 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 2651 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 2652 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 2653 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 2654#ifdef SOLARIS 2655 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 2656 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 2657 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 2658 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 2659#else // ndef SOLARIS 2660 jio_fprintf(defaultStream::error_stream(), 2661 "ExtendedDTraceProbes flag is only applicable on Solaris\n"); 2662 return JNI_EINVAL; 2663#endif // ndef SOLARIS 2664#ifdef ASSERT 2665 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 2666 FLAG_SET_CMDLINE(bool, FullGCALot, true); 2667 // disable scavenge before parallel mark-compact 2668 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2669#endif 2670 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 2671 julong cms_blocks_to_claim = (julong)atol(tail); 2672 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2673 jio_fprintf(defaultStream::error_stream(), 2674 "Please use -XX:OldPLABSize in place of " 2675 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 2676 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 2677 julong cms_blocks_to_claim = (julong)atol(tail); 2678 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2679 jio_fprintf(defaultStream::error_stream(), 2680 "Please use -XX:OldPLABSize in place of " 2681 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 2682 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 2683 julong old_plab_size = 0; 2684 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 2685 if (errcode != arg_in_range) { 2686 jio_fprintf(defaultStream::error_stream(), 2687 "Invalid old PLAB size: %s\n", option->optionString); 2688 describe_range_error(errcode); 2689 return JNI_EINVAL; 2690 } 2691 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 2692 jio_fprintf(defaultStream::error_stream(), 2693 "Please use -XX:OldPLABSize in place of " 2694 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 2695 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 2696 julong young_plab_size = 0; 2697 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 2698 if (errcode != arg_in_range) { 2699 jio_fprintf(defaultStream::error_stream(), 2700 "Invalid young PLAB size: %s\n", option->optionString); 2701 describe_range_error(errcode); 2702 return JNI_EINVAL; 2703 } 2704 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 2705 jio_fprintf(defaultStream::error_stream(), 2706 "Please use -XX:YoungPLABSize in place of " 2707 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 2708 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 2709 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 2710 julong stack_size = 0; 2711 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 2712 if (errcode != arg_in_range) { 2713 jio_fprintf(defaultStream::error_stream(), 2714 "Invalid mark stack size: %s\n", option->optionString); 2715 describe_range_error(errcode); 2716 return JNI_EINVAL; 2717 } 2718 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 2719 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 2720 julong max_stack_size = 0; 2721 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 2722 if (errcode != arg_in_range) { 2723 jio_fprintf(defaultStream::error_stream(), 2724 "Invalid maximum mark stack size: %s\n", 2725 option->optionString); 2726 describe_range_error(errcode); 2727 return JNI_EINVAL; 2728 } 2729 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 2730 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 2731 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 2732 uintx conc_threads = 0; 2733 if (!parse_uintx(tail, &conc_threads, 1)) { 2734 jio_fprintf(defaultStream::error_stream(), 2735 "Invalid concurrent threads: %s\n", option->optionString); 2736 return JNI_EINVAL; 2737 } 2738 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 2739 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2740 // Skip -XX:Flags= since that case has already been handled 2741 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 2742 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2743 return JNI_EINVAL; 2744 } 2745 } 2746 // Unknown option 2747 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2748 return JNI_ERR; 2749 } 2750 } 2751 // Change the default value for flags which have different default values 2752 // when working with older JDKs. 2753 if (JDK_Version::current().compare_major(6) <= 0 && 2754 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) { 2755 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true); 2756 } 2757#ifdef LINUX 2758 if (JDK_Version::current().compare_major(6) <= 0 && 2759 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 2760 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 2761 } 2762#endif // LINUX 2763 return JNI_OK; 2764} 2765 2766jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 2767 // This must be done after all -D arguments have been processed. 2768 scp_p->expand_endorsed(); 2769 2770 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 2771 // Assemble the bootclasspath elements into the final path. 2772 Arguments::set_sysclasspath(scp_p->combined_path()); 2773 } 2774 2775 // This must be done after all arguments have been processed. 2776 // java_compiler() true means set to "NONE" or empty. 2777 if (java_compiler() && !xdebug_mode()) { 2778 // For backwards compatibility, we switch to interpreted mode if 2779 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 2780 // not specified. 2781 set_mode_flags(_int); 2782 } 2783 if (CompileThreshold == 0) { 2784 set_mode_flags(_int); 2785 } 2786 2787#ifndef COMPILER2 2788 // Don't degrade server performance for footprint 2789 if (FLAG_IS_DEFAULT(UseLargePages) && 2790 MaxHeapSize < LargePageHeapSizeThreshold) { 2791 // No need for large granularity pages w/small heaps. 2792 // Note that large pages are enabled/disabled for both the 2793 // Java heap and the code cache. 2794 FLAG_SET_DEFAULT(UseLargePages, false); 2795 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false)); 2796 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false)); 2797 } 2798 2799 // Tiered compilation is undefined with C1. 2800 TieredCompilation = false; 2801#else 2802 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 2803 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 2804 } 2805 // Temporary disable bulk zeroing reduction with G1. See CR 6627983. 2806 if (UseG1GC) { 2807 FLAG_SET_DEFAULT(ReduceBulkZeroing, false); 2808 } 2809#endif 2810 2811 // If we are running in a headless jre, force java.awt.headless property 2812 // to be true unless the property has already been set. 2813 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 2814 if (os::is_headless_jre()) { 2815 const char* headless = Arguments::get_property("java.awt.headless"); 2816 if (headless == NULL) { 2817 char envbuffer[128]; 2818 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 2819 if (!add_property("java.awt.headless=true")) { 2820 return JNI_ENOMEM; 2821 } 2822 } else { 2823 char buffer[256]; 2824 strcpy(buffer, "java.awt.headless="); 2825 strcat(buffer, envbuffer); 2826 if (!add_property(buffer)) { 2827 return JNI_ENOMEM; 2828 } 2829 } 2830 } 2831 } 2832 2833 if (!check_vm_args_consistency()) { 2834 return JNI_ERR; 2835 } 2836 2837 return JNI_OK; 2838} 2839 2840jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2841 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 2842 scp_assembly_required_p); 2843} 2844 2845jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2846 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 2847 scp_assembly_required_p); 2848} 2849 2850jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 2851 const int N_MAX_OPTIONS = 64; 2852 const int OPTION_BUFFER_SIZE = 1024; 2853 char buffer[OPTION_BUFFER_SIZE]; 2854 2855 // The variable will be ignored if it exceeds the length of the buffer. 2856 // Don't check this variable if user has special privileges 2857 // (e.g. unix su command). 2858 if (os::getenv(name, buffer, sizeof(buffer)) && 2859 !os::have_special_privileges()) { 2860 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 2861 jio_fprintf(defaultStream::error_stream(), 2862 "Picked up %s: %s\n", name, buffer); 2863 char* rd = buffer; // pointer to the input string (rd) 2864 int i; 2865 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 2866 while (isspace(*rd)) rd++; // skip whitespace 2867 if (*rd == 0) break; // we re done when the input string is read completely 2868 2869 // The output, option string, overwrites the input string. 2870 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 2871 // input string (rd). 2872 char* wrt = rd; 2873 2874 options[i++].optionString = wrt; // Fill in option 2875 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 2876 if (*rd == '\'' || *rd == '"') { // handle a quoted string 2877 int quote = *rd; // matching quote to look for 2878 rd++; // don't copy open quote 2879 while (*rd != quote) { // include everything (even spaces) up until quote 2880 if (*rd == 0) { // string termination means unmatched string 2881 jio_fprintf(defaultStream::error_stream(), 2882 "Unmatched quote in %s\n", name); 2883 return JNI_ERR; 2884 } 2885 *wrt++ = *rd++; // copy to option string 2886 } 2887 rd++; // don't copy close quote 2888 } else { 2889 *wrt++ = *rd++; // copy to option string 2890 } 2891 } 2892 // Need to check if we're done before writing a NULL, 2893 // because the write could be to the byte that rd is pointing to. 2894 if (*rd++ == 0) { 2895 *wrt = 0; 2896 break; 2897 } 2898 *wrt = 0; // Zero terminate option 2899 } 2900 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 2901 JavaVMInitArgs vm_args; 2902 vm_args.version = JNI_VERSION_1_2; 2903 vm_args.options = options; 2904 vm_args.nOptions = i; 2905 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 2906 2907 if (PrintVMOptions) { 2908 const char* tail; 2909 for (int i = 0; i < vm_args.nOptions; i++) { 2910 const JavaVMOption *option = vm_args.options + i; 2911 if (match_option(option, "-XX:", &tail)) { 2912 logOption(tail); 2913 } 2914 } 2915 } 2916 2917 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR)); 2918 } 2919 return JNI_OK; 2920} 2921 2922 2923// Parse entry point called from JNI_CreateJavaVM 2924 2925jint Arguments::parse(const JavaVMInitArgs* args) { 2926 2927 // Sharing support 2928 // Construct the path to the archive 2929 char jvm_path[JVM_MAXPATHLEN]; 2930 os::jvm_path(jvm_path, sizeof(jvm_path)); 2931#ifdef TIERED 2932 if (strstr(jvm_path, "client") != NULL) { 2933 force_client_mode = true; 2934 } 2935#endif // TIERED 2936 char *end = strrchr(jvm_path, *os::file_separator()); 2937 if (end != NULL) *end = '\0'; 2938 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) + 2939 strlen(os::file_separator()) + 20); 2940 if (shared_archive_path == NULL) return JNI_ENOMEM; 2941 strcpy(shared_archive_path, jvm_path); 2942 strcat(shared_archive_path, os::file_separator()); 2943 strcat(shared_archive_path, "classes"); 2944 DEBUG_ONLY(strcat(shared_archive_path, "_g");) 2945 strcat(shared_archive_path, ".jsa"); 2946 SharedArchivePath = shared_archive_path; 2947 2948 // Remaining part of option string 2949 const char* tail; 2950 2951 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 2952 bool settings_file_specified = false; 2953 const char* flags_file; 2954 int index; 2955 for (index = 0; index < args->nOptions; index++) { 2956 const JavaVMOption *option = args->options + index; 2957 if (match_option(option, "-XX:Flags=", &tail)) { 2958 flags_file = tail; 2959 settings_file_specified = true; 2960 } 2961 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 2962 PrintVMOptions = true; 2963 } 2964 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 2965 PrintVMOptions = false; 2966 } 2967 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 2968 IgnoreUnrecognizedVMOptions = true; 2969 } 2970 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 2971 IgnoreUnrecognizedVMOptions = false; 2972 } 2973 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 2974 CommandLineFlags::printFlags(); 2975 vm_exit(0); 2976 } 2977 2978#ifndef PRODUCT 2979 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 2980 CommandLineFlags::printFlags(true); 2981 vm_exit(0); 2982 } 2983#endif 2984 } 2985 2986 if (IgnoreUnrecognizedVMOptions) { 2987 // uncast const to modify the flag args->ignoreUnrecognized 2988 *(jboolean*)(&args->ignoreUnrecognized) = true; 2989 } 2990 2991 // Parse specified settings file 2992 if (settings_file_specified) { 2993 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 2994 return JNI_EINVAL; 2995 } 2996 } 2997 2998 // Parse default .hotspotrc settings file 2999 if (!settings_file_specified) { 3000 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3001 return JNI_EINVAL; 3002 } 3003 } 3004 3005 if (PrintVMOptions) { 3006 for (index = 0; index < args->nOptions; index++) { 3007 const JavaVMOption *option = args->options + index; 3008 if (match_option(option, "-XX:", &tail)) { 3009 logOption(tail); 3010 } 3011 } 3012 } 3013 3014 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3015 jint result = parse_vm_init_args(args); 3016 if (result != JNI_OK) { 3017 return result; 3018 } 3019 3020#ifndef PRODUCT 3021 if (TraceBytecodesAt != 0) { 3022 TraceBytecodes = true; 3023 } 3024 if (CountCompiledCalls) { 3025 if (UseCounterDecay) { 3026 warning("UseCounterDecay disabled because CountCalls is set"); 3027 UseCounterDecay = false; 3028 } 3029 } 3030#endif // PRODUCT 3031 3032 if (EnableInvokeDynamic && !EnableMethodHandles) { 3033 if (!FLAG_IS_DEFAULT(EnableMethodHandles)) { 3034 warning("forcing EnableMethodHandles true because EnableInvokeDynamic is true"); 3035 } 3036 EnableMethodHandles = true; 3037 } 3038 if (EnableMethodHandles && !AnonymousClasses) { 3039 if (!FLAG_IS_DEFAULT(AnonymousClasses)) { 3040 warning("forcing AnonymousClasses true because EnableMethodHandles is true"); 3041 } 3042 AnonymousClasses = true; 3043 } 3044 if ((EnableMethodHandles || AnonymousClasses) && ScavengeRootsInCode == 0) { 3045 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3046 warning("forcing ScavengeRootsInCode non-zero because EnableMethodHandles or AnonymousClasses is true"); 3047 } 3048 ScavengeRootsInCode = 1; 3049 } 3050#ifdef COMPILER2 3051 if (EnableInvokeDynamic && DoEscapeAnalysis) { 3052 // TODO: We need to find rules for invokedynamic and EA. For now, 3053 // simply disable EA by default. 3054 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 3055 DoEscapeAnalysis = false; 3056 } 3057 } 3058#endif 3059 3060 if (PrintGCDetails) { 3061 // Turn on -verbose:gc options as well 3062 PrintGC = true; 3063 } 3064 3065 // Set object alignment values. 3066 set_object_alignment(); 3067 3068#ifdef SERIALGC 3069 force_serial_gc(); 3070#endif // SERIALGC 3071#ifdef KERNEL 3072 no_shared_spaces(); 3073#endif // KERNEL 3074 3075 // Set flags based on ergonomics. 3076 set_ergonomics_flags(); 3077 3078#ifdef _LP64 3079 if (UseCompressedOops) { 3080 check_compressed_oops_compat(); 3081 } 3082#endif 3083 3084 // Check the GC selections again. 3085 if (!check_gc_consistency()) { 3086 return JNI_EINVAL; 3087 } 3088 3089 if (TieredCompilation) { 3090 set_tiered_flags(); 3091 } else { 3092 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3093 if (CompilationPolicyChoice >= 2) { 3094 vm_exit_during_initialization( 3095 "Incompatible compilation policy selected", NULL); 3096 } 3097 } 3098 3099#ifndef KERNEL 3100 if (UseConcMarkSweepGC) { 3101 // Set flags for CMS and ParNew. Check UseConcMarkSweep first 3102 // to ensure that when both UseConcMarkSweepGC and UseParNewGC 3103 // are true, we don't call set_parnew_gc_flags() as well. 3104 set_cms_and_parnew_gc_flags(); 3105 } else { 3106 // Set heap size based on available physical memory 3107 set_heap_size(); 3108 // Set per-collector flags 3109 if (UseParallelGC || UseParallelOldGC) { 3110 set_parallel_gc_flags(); 3111 } else if (UseParNewGC) { 3112 set_parnew_gc_flags(); 3113 } else if (UseG1GC) { 3114 set_g1_gc_flags(); 3115 } 3116 } 3117#endif // KERNEL 3118 3119#ifdef SERIALGC 3120 assert(verify_serial_gc_flags(), "SerialGC unset"); 3121#endif // SERIALGC 3122 3123 // Set bytecode rewriting flags 3124 set_bytecode_flags(); 3125 3126 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 3127 set_aggressive_opts_flags(); 3128 3129#ifdef CC_INTERP 3130 // Clear flags not supported by the C++ interpreter 3131 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3132 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3133 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3134#endif // CC_INTERP 3135 3136#ifdef COMPILER2 3137 if (!UseBiasedLocking || EmitSync != 0) { 3138 UseOptoBiasInlining = false; 3139 } 3140#endif 3141 3142 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3143 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3144 DebugNonSafepoints = true; 3145 } 3146 3147#ifndef PRODUCT 3148 if (CompileTheWorld) { 3149 // Force NmethodSweeper to sweep whole CodeCache each time. 3150 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3151 NmethodSweepFraction = 1; 3152 } 3153 } 3154#endif 3155 3156 if (PrintCommandLineFlags) { 3157 CommandLineFlags::printSetFlags(); 3158 } 3159 3160 // Apply CPU specific policy for the BiasedLocking 3161 if (UseBiasedLocking) { 3162 if (!VM_Version::use_biased_locking() && 3163 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3164 UseBiasedLocking = false; 3165 } 3166 } 3167 3168 return JNI_OK; 3169} 3170 3171int Arguments::PropertyList_count(SystemProperty* pl) { 3172 int count = 0; 3173 while(pl != NULL) { 3174 count++; 3175 pl = pl->next(); 3176 } 3177 return count; 3178} 3179 3180const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3181 assert(key != NULL, "just checking"); 3182 SystemProperty* prop; 3183 for (prop = pl; prop != NULL; prop = prop->next()) { 3184 if (strcmp(key, prop->key()) == 0) return prop->value(); 3185 } 3186 return NULL; 3187} 3188 3189const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3190 int count = 0; 3191 const char* ret_val = NULL; 3192 3193 while(pl != NULL) { 3194 if(count >= index) { 3195 ret_val = pl->key(); 3196 break; 3197 } 3198 count++; 3199 pl = pl->next(); 3200 } 3201 3202 return ret_val; 3203} 3204 3205char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3206 int count = 0; 3207 char* ret_val = NULL; 3208 3209 while(pl != NULL) { 3210 if(count >= index) { 3211 ret_val = pl->value(); 3212 break; 3213 } 3214 count++; 3215 pl = pl->next(); 3216 } 3217 3218 return ret_val; 3219} 3220 3221void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3222 SystemProperty* p = *plist; 3223 if (p == NULL) { 3224 *plist = new_p; 3225 } else { 3226 while (p->next() != NULL) { 3227 p = p->next(); 3228 } 3229 p->set_next(new_p); 3230 } 3231} 3232 3233void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3234 if (plist == NULL) 3235 return; 3236 3237 SystemProperty* new_p = new SystemProperty(k, v, true); 3238 PropertyList_add(plist, new_p); 3239} 3240 3241// This add maintains unique property key in the list. 3242void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3243 if (plist == NULL) 3244 return; 3245 3246 // If property key exist then update with new value. 3247 SystemProperty* prop; 3248 for (prop = *plist; prop != NULL; prop = prop->next()) { 3249 if (strcmp(k, prop->key()) == 0) { 3250 if (append) { 3251 prop->append_value(v); 3252 } else { 3253 prop->set_value(v); 3254 } 3255 return; 3256 } 3257 } 3258 3259 PropertyList_add(plist, k, v); 3260} 3261 3262#ifdef KERNEL 3263char *Arguments::get_kernel_properties() { 3264 // Find properties starting with kernel and append them to string 3265 // We need to find out how long they are first because the URL's that they 3266 // might point to could get long. 3267 int length = 0; 3268 SystemProperty* prop; 3269 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 3270 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 3271 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D =" 3272 } 3273 } 3274 // Add one for null terminator. 3275 char *props = AllocateHeap(length + 1, "get_kernel_properties"); 3276 if (length != 0) { 3277 int pos = 0; 3278 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 3279 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 3280 jio_snprintf(&props[pos], length-pos, 3281 "-D%s=%s ", prop->key(), prop->value()); 3282 pos = strlen(props); 3283 } 3284 } 3285 } 3286 // null terminate props in case of null 3287 props[length] = '\0'; 3288 return props; 3289} 3290#endif // KERNEL 3291 3292// Copies src into buf, replacing "%%" with "%" and "%p" with pid 3293// Returns true if all of the source pointed by src has been copied over to 3294// the destination buffer pointed by buf. Otherwise, returns false. 3295// Notes: 3296// 1. If the length (buflen) of the destination buffer excluding the 3297// NULL terminator character is not long enough for holding the expanded 3298// pid characters, it also returns false instead of returning the partially 3299// expanded one. 3300// 2. The passed in "buflen" should be large enough to hold the null terminator. 3301bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3302 char* buf, size_t buflen) { 3303 const char* p = src; 3304 char* b = buf; 3305 const char* src_end = &src[srclen]; 3306 char* buf_end = &buf[buflen - 1]; 3307 3308 while (p < src_end && b < buf_end) { 3309 if (*p == '%') { 3310 switch (*(++p)) { 3311 case '%': // "%%" ==> "%" 3312 *b++ = *p++; 3313 break; 3314 case 'p': { // "%p" ==> current process id 3315 // buf_end points to the character before the last character so 3316 // that we could write '\0' to the end of the buffer. 3317 size_t buf_sz = buf_end - b + 1; 3318 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3319 3320 // if jio_snprintf fails or the buffer is not long enough to hold 3321 // the expanded pid, returns false. 3322 if (ret < 0 || ret >= (int)buf_sz) { 3323 return false; 3324 } else { 3325 b += ret; 3326 assert(*b == '\0', "fail in copy_expand_pid"); 3327 if (p == src_end && b == buf_end + 1) { 3328 // reach the end of the buffer. 3329 return true; 3330 } 3331 } 3332 p++; 3333 break; 3334 } 3335 default : 3336 *b++ = '%'; 3337 } 3338 } else { 3339 *b++ = *p++; 3340 } 3341 } 3342 *b = '\0'; 3343 return (p == src_end); // return false if not all of the source was copied 3344} 3345