arguments.cpp revision 9607:c8e212fb27d0
1104862Sru/* 275584Sru * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 375584Sru * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 475584Sru * 5104862Sru * This code is free software; you can redistribute it and/or modify it 6114402Sru * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "precompiled.hpp" 26#include "classfile/classLoader.hpp" 27#include "classfile/javaAssertions.hpp" 28#include "classfile/stringTable.hpp" 29#include "classfile/symbolTable.hpp" 30#include "code/codeCacheExtensions.hpp" 31#include "gc/shared/cardTableRS.hpp" 32#include "gc/shared/genCollectedHeap.hpp" 33#include "gc/shared/referenceProcessor.hpp" 34#include "gc/shared/taskqueue.hpp" 35#include "logging/logConfiguration.hpp" 36#include "memory/allocation.inline.hpp" 37#include "memory/universe.inline.hpp" 38#include "oops/oop.inline.hpp" 39#include "prims/jvmtiExport.hpp" 40#include "runtime/arguments.hpp" 41#include "runtime/arguments_ext.hpp" 42#include "runtime/commandLineFlagConstraintList.hpp" 43#include "runtime/commandLineFlagRangeList.hpp" 44#include "runtime/globals.hpp" 45#include "runtime/globals_extension.hpp" 46#include "runtime/java.hpp" 47#include "runtime/os.hpp" 48#include "runtime/vm_version.hpp" 49#include "services/management.hpp" 50#include "services/memTracker.hpp" 51#include "utilities/defaultStream.hpp" 52#include "utilities/macros.hpp" 53#include "utilities/stringUtils.hpp" 54#if INCLUDE_JVMCI 55#include "jvmci/jvmciRuntime.hpp" 56#endif 57#if INCLUDE_ALL_GCS 58#include "gc/cms/compactibleFreeListSpace.hpp" 59#include "gc/g1/g1CollectedHeap.inline.hpp" 60#include "gc/parallel/parallelScavengeHeap.hpp" 61#endif // INCLUDE_ALL_GCS 62 63// Note: This is a special bug reporting site for the JVM 64#define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 65#define DEFAULT_JAVA_LAUNCHER "generic" 66 67#define UNSUPPORTED_GC_OPTION(gc) \ 68do { \ 69 if (gc) { \ 70 if (FLAG_IS_CMDLINE(gc)) { \ 71 warning(#gc " is not supported in this VM. Using Serial GC."); \ 72 } \ 73 FLAG_SET_DEFAULT(gc, false); \ 74 } \ 75} while(0) 76 77char* Arguments::_jvm_flags_file = NULL; 78char** Arguments::_jvm_flags_array = NULL; 79int Arguments::_num_jvm_flags = 0; 80char** Arguments::_jvm_args_array = NULL; 81int Arguments::_num_jvm_args = 0; 82char* Arguments::_java_command = NULL; 83SystemProperty* Arguments::_system_properties = NULL; 84const char* Arguments::_gc_log_filename = NULL; 85bool Arguments::_has_profile = false; 86size_t Arguments::_conservative_max_heap_alignment = 0; 87size_t Arguments::_min_heap_size = 0; 88Arguments::Mode Arguments::_mode = _mixed; 89bool Arguments::_java_compiler = false; 90bool Arguments::_xdebug_mode = false; 91const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 92const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 93int Arguments::_sun_java_launcher_pid = -1; 94bool Arguments::_sun_java_launcher_is_altjvm = false; 95 96// These parameters are reset in method parse_vm_init_args() 97bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 98bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 99bool Arguments::_BackgroundCompilation = BackgroundCompilation; 100bool Arguments::_ClipInlining = ClipInlining; 101intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 102intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 103 104char* Arguments::SharedArchivePath = NULL; 105 106AgentLibraryList Arguments::_libraryList; 107AgentLibraryList Arguments::_agentList; 108 109abort_hook_t Arguments::_abort_hook = NULL; 110exit_hook_t Arguments::_exit_hook = NULL; 111vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 112 113 114SystemProperty *Arguments::_sun_boot_library_path = NULL; 115SystemProperty *Arguments::_java_library_path = NULL; 116SystemProperty *Arguments::_java_home = NULL; 117SystemProperty *Arguments::_java_class_path = NULL; 118SystemProperty *Arguments::_sun_boot_class_path = NULL; 119 120char* Arguments::_ext_dirs = NULL; 121 122// Check if head of 'option' matches 'name', and sets 'tail' to the remaining 123// part of the option string. 124static bool match_option(const JavaVMOption *option, const char* name, 125 const char** tail) { 126 size_t len = strlen(name); 127 if (strncmp(option->optionString, name, len) == 0) { 128 *tail = option->optionString + len; 129 return true; 130 } else { 131 return false; 132 } 133} 134 135// Check if 'option' matches 'name'. No "tail" is allowed. 136static bool match_option(const JavaVMOption *option, const char* name) { 137 const char* tail = NULL; 138 bool result = match_option(option, name, &tail); 139 if (tail != NULL && *tail == '\0') { 140 return result; 141 } else { 142 return false; 143 } 144} 145 146// Return true if any of the strings in null-terminated array 'names' matches. 147// If tail_allowed is true, then the tail must begin with a colon; otherwise, 148// the option must match exactly. 149static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 150 bool tail_allowed) { 151 for (/* empty */; *names != NULL; ++names) { 152 if (match_option(option, *names, tail)) { 153 if (**tail == '\0' || tail_allowed && **tail == ':') { 154 return true; 155 } 156 } 157 } 158 return false; 159} 160 161static void logOption(const char* opt) { 162 if (PrintVMOptions) { 163 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 164 } 165} 166 167// Process java launcher properties. 168void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 169 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 170 // sun.java.launcher.pid is defined. 171 // Must do this before setting up other system properties, 172 // as some of them may depend on launcher type. 173 for (int index = 0; index < args->nOptions; index++) { 174 const JavaVMOption* option = args->options + index; 175 const char* tail; 176 177 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 178 process_java_launcher_argument(tail, option->extraInfo); 179 continue; 180 } 181 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 182 if (strcmp(tail, "true") == 0) { 183 _sun_java_launcher_is_altjvm = true; 184 } 185 continue; 186 } 187 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 188 _sun_java_launcher_pid = atoi(tail); 189 continue; 190 } 191 } 192} 193 194// Initialize system properties key and value. 195void Arguments::init_system_properties() { 196 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 197 "Java Virtual Machine Specification", false)); 198 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 199 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 200 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 201 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 202 203 // Following are JVMTI agent writable properties. 204 // Properties values are set to NULL and they are 205 // os specific they are initialized in os::init_system_properties_values(). 206 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 207 _java_library_path = new SystemProperty("java.library.path", NULL, true); 208 _java_home = new SystemProperty("java.home", NULL, true); 209 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 210 211 _java_class_path = new SystemProperty("java.class.path", "", true); 212 213 // Add to System Property list. 214 PropertyList_add(&_system_properties, _sun_boot_library_path); 215 PropertyList_add(&_system_properties, _java_library_path); 216 PropertyList_add(&_system_properties, _java_home); 217 PropertyList_add(&_system_properties, _java_class_path); 218 PropertyList_add(&_system_properties, _sun_boot_class_path); 219 220 // Set OS specific system properties values 221 os::init_system_properties_values(); 222 223 JVMCI_ONLY(JVMCIRuntime::init_system_properties(&_system_properties);) 224} 225 226// Update/Initialize System properties after JDK version number is known 227void Arguments::init_version_specific_system_properties() { 228 enum { bufsz = 16 }; 229 char buffer[bufsz]; 230 const char* spec_vendor = "Oracle Corporation"; 231 uint32_t spec_version = JDK_Version::current().major_version(); 232 233 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 234 235 PropertyList_add(&_system_properties, 236 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 237 PropertyList_add(&_system_properties, 238 new SystemProperty("java.vm.specification.version", buffer, false)); 239 PropertyList_add(&_system_properties, 240 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 241} 242 243/* 244 * -XX argument processing: 245 * 246 * -XX arguments are defined in several places, such as: 247 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 248 * -XX arguments are parsed in parse_argument(). 249 * -XX argument bounds checking is done in check_vm_args_consistency(). 250 * 251 * Over time -XX arguments may change. There are mechanisms to handle common cases: 252 * 253 * ALIASED: An option that is simply another name for another option. This is often 254 * part of the process of deprecating a flag, but not all aliases need 255 * to be deprecated. 256 * 257 * Create an alias for an option by adding the old and new option names to the 258 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 259 * 260 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 261 * support may be removed in the future. Both regular and aliased options may be 262 * deprecated. 263 * 264 * Add a deprecation warning for an option (or alias) by adding an entry in the 265 * "special_jvm_flags" table and setting the "deprecated_in" field. 266 * Often an option "deprecated" in one major release will 267 * be made "obsolete" in the next. In this case the entry should also have it's 268 * "obsolete_in" field set. 269 * 270 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 271 * on the command line. A warning is printed to let the user know that option might not 272 * be accepted in the future. 273 * 274 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 275 * table and setting the "obsolete_in" field. 276 * 277 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 278 * to the current JDK version. The system will flatly refuse to admit the existence of 279 * the flag. This allows a flag to die automatically over JDK releases. 280 * 281 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 282 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 283 * - Newly obsolete or expired deprecated options should have their global variable 284 * definitions removed (from globals.hpp, etc) and related implementations removed. 285 * 286 * Recommended approach for removing options: 287 * 288 * To remove options commonly used by customers (e.g. product, commercial -XX options), use 289 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 290 * 291 * To remove internal options (e.g. diagnostic, experimental, develop options), use 292 * a 2-step model adding major release numbers to the obsolete and expire columns. 293 * 294 * To change the name of an option, use the alias table as well as a 2-step 295 * model adding major release numbers to the deprecate and expire columns. 296 * Think twice about aliasing commonly used customer options. 297 * 298 * There are times when it is appropriate to leave a future release number as undefined. 299 * 300 * Tests: Aliases should be tested in VMAliasOptions.java. 301 * Deprecated options should be tested in VMDeprecatedOptions.java. 302 */ 303 304// Obsolete or deprecated -XX flag. 305typedef struct { 306 const char* name; 307 JDK_Version deprecated_in; // When the deprecation warning started (or "undefined"). 308 JDK_Version obsolete_in; // When the obsolete warning started (or "undefined"). 309 JDK_Version expired_in; // When the option expires (or "undefined"). 310} SpecialFlag; 311 312// The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 313// "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 314// When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 315// the command-line as usual, but will issue a warning. 316// When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 317// the command-line, while issuing a warning and ignoring the flag value. 318// Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 319// existence of the flag. 320// 321// MANUAL CLEANUP ON JDK VERSION UPDATES: 322// This table ensures that the handling of options will update automatically when the JDK 323// version is incremented, but the source code needs to be cleanup up manually: 324// - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 325// variable should be removed, as well as users of the variable. 326// - As "deprecated" options age into "obsolete" options, move the entry into the 327// "Obsolete Flags" section of the table. 328// - All expired options should be removed from the table. 329static SpecialFlag const special_jvm_flags[] = { 330 // -------------- Deprecated Flags -------------- 331 // --- Non-alias flags - sorted by obsolete_in then expired_in: 332 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 333 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 334 335 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 336 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 337 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 338 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 339 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 340 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 341 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 342 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 343 344 // -------------- Obsolete Flags - sorted by expired_in -------------- 345 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 346 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 347 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 348 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 349 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 350 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 351 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 352 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 353 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 354 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 355 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 356 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 357 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 358#ifndef ZERO 359 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 360 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 361#endif // ZERO 362 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 363 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 364 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 365 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 366 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 367 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 368 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 369 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 370 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 371 372#ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 373 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 374 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 375 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 376 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 377 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 378 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 379 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() }, 380#endif 381 382 { NULL, JDK_Version(0), JDK_Version(0) } 383}; 384 385// Flags that are aliases for other flags. 386typedef struct { 387 const char* alias_name; 388 const char* real_name; 389} AliasedFlag; 390 391static AliasedFlag const aliased_jvm_flags[] = { 392 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 393 { "CMSMarkStackSizeMax", "MarkStackSizeMax" }, 394 { "CMSMarkStackSize", "MarkStackSize" }, 395 { "G1MarkStackSize", "MarkStackSize" }, 396 { "ParallelMarkingThreads", "ConcGCThreads" }, 397 { "ParallelCMSThreads", "ConcGCThreads" }, 398 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 399 { NULL, NULL} 400}; 401 402// Return true if "v" is less than "other", where "other" may be "undefined". 403static bool version_less_than(JDK_Version v, JDK_Version other) { 404 assert(!v.is_undefined(), "must be defined"); 405 if (!other.is_undefined() && v.compare(other) >= 0) { 406 return false; 407 } else { 408 return true; 409 } 410} 411 412static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 413 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 414 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 415 flag = special_jvm_flags[i]; 416 return true; 417 } 418 } 419 return false; 420} 421 422bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 423 assert(version != NULL, "Must provide a version buffer"); 424 SpecialFlag flag; 425 if (lookup_special_flag(flag_name, flag)) { 426 if (!flag.obsolete_in.is_undefined()) { 427 if (version_less_than(JDK_Version::current(), flag.expired_in)) { 428 *version = flag.obsolete_in; 429 return true; 430 } 431 } 432 } 433 return false; 434} 435 436int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 437 assert(version != NULL, "Must provide a version buffer"); 438 SpecialFlag flag; 439 if (lookup_special_flag(flag_name, flag)) { 440 if (!flag.deprecated_in.is_undefined()) { 441 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 442 version_less_than(JDK_Version::current(), flag.expired_in)) { 443 *version = flag.deprecated_in; 444 return 1; 445 } else { 446 return -1; 447 } 448 } 449 } 450 return 0; 451} 452 453const char* Arguments::real_flag_name(const char *flag_name) { 454 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 455 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 456 if (strcmp(flag_status.alias_name, flag_name) == 0) { 457 return flag_status.real_name; 458 } 459 } 460 return flag_name; 461} 462 463#ifdef ASSERT 464static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 465 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 466 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 467 return true; 468 } 469 } 470 return false; 471} 472 473static bool verify_special_jvm_flags() { 474 bool success = true; 475 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 476 const SpecialFlag& flag = special_jvm_flags[i]; 477 if (lookup_special_flag(flag.name, i)) { 478 warning("Duplicate special flag declaration \"%s\"", flag.name); 479 success = false; 480 } 481 if (flag.deprecated_in.is_undefined() && 482 flag.obsolete_in.is_undefined()) { 483 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 484 success = false; 485 } 486 487 if (!flag.deprecated_in.is_undefined()) { 488 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 489 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 490 success = false; 491 } 492 493 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 494 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 495 success = false; 496 } 497 } 498 499 if (!flag.obsolete_in.is_undefined()) { 500 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 501 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 502 success = false; 503 } 504 505 // if flag has become obsolete it should not have a "globals" flag defined anymore. 506 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 507 if (Flag::find_flag(flag.name) != NULL) { 508 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 509 success = false; 510 } 511 } 512 } 513 514 if (!flag.expired_in.is_undefined()) { 515 // if flag has become expired it should not have a "globals" flag defined anymore. 516 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 517 if (Flag::find_flag(flag.name) != NULL) { 518 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 519 success = false; 520 } 521 } 522 } 523 524 } 525 return success; 526} 527#endif 528 529// Constructs the system class path (aka boot class path) from the following 530// components, in order: 531// 532// prefix // from -Xbootclasspath/p:... 533// base // from os::get_system_properties() or -Xbootclasspath= 534// suffix // from -Xbootclasspath/a:... 535// 536// This could be AllStatic, but it isn't needed after argument processing is 537// complete. 538class SysClassPath: public StackObj { 539public: 540 SysClassPath(const char* base); 541 ~SysClassPath(); 542 543 inline void set_base(const char* base); 544 inline void add_prefix(const char* prefix); 545 inline void add_suffix_to_prefix(const char* suffix); 546 inline void add_suffix(const char* suffix); 547 inline void reset_path(const char* base); 548 549 inline const char* get_base() const { return _items[_scp_base]; } 550 inline const char* get_prefix() const { return _items[_scp_prefix]; } 551 inline const char* get_suffix() const { return _items[_scp_suffix]; } 552 553 // Combine all the components into a single c-heap-allocated string; caller 554 // must free the string if/when no longer needed. 555 char* combined_path(); 556 557private: 558 // Utility routines. 559 static char* add_to_path(const char* path, const char* str, bool prepend); 560 static char* add_jars_to_path(char* path, const char* directory); 561 562 inline void reset_item_at(int index); 563 564 // Array indices for the items that make up the sysclasspath. All except the 565 // base are allocated in the C heap and freed by this class. 566 enum { 567 _scp_prefix, // from -Xbootclasspath/p:... 568 _scp_base, // the default sysclasspath 569 _scp_suffix, // from -Xbootclasspath/a:... 570 _scp_nitems // the number of items, must be last. 571 }; 572 573 const char* _items[_scp_nitems]; 574}; 575 576SysClassPath::SysClassPath(const char* base) { 577 memset(_items, 0, sizeof(_items)); 578 _items[_scp_base] = base; 579} 580 581SysClassPath::~SysClassPath() { 582 // Free everything except the base. 583 for (int i = 0; i < _scp_nitems; ++i) { 584 if (i != _scp_base) reset_item_at(i); 585 } 586} 587 588inline void SysClassPath::set_base(const char* base) { 589 _items[_scp_base] = base; 590} 591 592inline void SysClassPath::add_prefix(const char* prefix) { 593 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 594} 595 596inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 597 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 598} 599 600inline void SysClassPath::add_suffix(const char* suffix) { 601 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 602} 603 604inline void SysClassPath::reset_item_at(int index) { 605 assert(index < _scp_nitems && index != _scp_base, "just checking"); 606 if (_items[index] != NULL) { 607 FREE_C_HEAP_ARRAY(char, _items[index]); 608 _items[index] = NULL; 609 } 610} 611 612inline void SysClassPath::reset_path(const char* base) { 613 // Clear the prefix and suffix. 614 reset_item_at(_scp_prefix); 615 reset_item_at(_scp_suffix); 616 set_base(base); 617} 618 619//------------------------------------------------------------------------------ 620 621 622// Combine the bootclasspath elements, some of which may be null, into a single 623// c-heap-allocated string. 624char* SysClassPath::combined_path() { 625 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 626 627 size_t lengths[_scp_nitems]; 628 size_t total_len = 0; 629 630 const char separator = *os::path_separator(); 631 632 // Get the lengths. 633 int i; 634 for (i = 0; i < _scp_nitems; ++i) { 635 if (_items[i] != NULL) { 636 lengths[i] = strlen(_items[i]); 637 // Include space for the separator char (or a NULL for the last item). 638 total_len += lengths[i] + 1; 639 } 640 } 641 assert(total_len > 0, "empty sysclasspath not allowed"); 642 643 // Copy the _items to a single string. 644 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 645 char* cp_tmp = cp; 646 for (i = 0; i < _scp_nitems; ++i) { 647 if (_items[i] != NULL) { 648 memcpy(cp_tmp, _items[i], lengths[i]); 649 cp_tmp += lengths[i]; 650 *cp_tmp++ = separator; 651 } 652 } 653 *--cp_tmp = '\0'; // Replace the extra separator. 654 return cp; 655} 656 657// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 658char* 659SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 660 char *cp; 661 662 assert(str != NULL, "just checking"); 663 if (path == NULL) { 664 size_t len = strlen(str) + 1; 665 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 666 memcpy(cp, str, len); // copy the trailing null 667 } else { 668 const char separator = *os::path_separator(); 669 size_t old_len = strlen(path); 670 size_t str_len = strlen(str); 671 size_t len = old_len + str_len + 2; 672 673 if (prepend) { 674 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 675 char* cp_tmp = cp; 676 memcpy(cp_tmp, str, str_len); 677 cp_tmp += str_len; 678 *cp_tmp = separator; 679 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 680 FREE_C_HEAP_ARRAY(char, path); 681 } else { 682 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 683 char* cp_tmp = cp + old_len; 684 *cp_tmp = separator; 685 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 686 } 687 } 688 return cp; 689} 690 691// Scan the directory and append any jar or zip files found to path. 692// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 693char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 694 DIR* dir = os::opendir(directory); 695 if (dir == NULL) return path; 696 697 char dir_sep[2] = { '\0', '\0' }; 698 size_t directory_len = strlen(directory); 699 const char fileSep = *os::file_separator(); 700 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 701 702 /* Scan the directory for jars/zips, appending them to path. */ 703 struct dirent *entry; 704 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 705 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 706 const char* name = entry->d_name; 707 const char* ext = name + strlen(name) - 4; 708 bool isJarOrZip = ext > name && 709 (os::file_name_strcmp(ext, ".jar") == 0 || 710 os::file_name_strcmp(ext, ".zip") == 0); 711 if (isJarOrZip) { 712 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 713 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 714 path = add_to_path(path, jarpath, false); 715 FREE_C_HEAP_ARRAY(char, jarpath); 716 } 717 } 718 FREE_C_HEAP_ARRAY(char, dbuf); 719 os::closedir(dir); 720 return path; 721} 722 723// Parses a memory size specification string. 724static bool atomull(const char *s, julong* result) { 725 julong n = 0; 726 int args_read = 0; 727 bool is_hex = false; 728 // Skip leading 0[xX] for hexadecimal 729 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) { 730 s += 2; 731 is_hex = true; 732 args_read = sscanf(s, JULONG_FORMAT_X, &n); 733 } else { 734 args_read = sscanf(s, JULONG_FORMAT, &n); 735 } 736 if (args_read != 1) { 737 return false; 738 } 739 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) { 740 s++; 741 } 742 // 4705540: illegal if more characters are found after the first non-digit 743 if (strlen(s) > 1) { 744 return false; 745 } 746 switch (*s) { 747 case 'T': case 't': 748 *result = n * G * K; 749 // Check for overflow. 750 if (*result/((julong)G * K) != n) return false; 751 return true; 752 case 'G': case 'g': 753 *result = n * G; 754 if (*result/G != n) return false; 755 return true; 756 case 'M': case 'm': 757 *result = n * M; 758 if (*result/M != n) return false; 759 return true; 760 case 'K': case 'k': 761 *result = n * K; 762 if (*result/K != n) return false; 763 return true; 764 case '\0': 765 *result = n; 766 return true; 767 default: 768 return false; 769 } 770} 771 772Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 773 if (size < min_size) return arg_too_small; 774 // Check that size will fit in a size_t (only relevant on 32-bit) 775 if (size > max_uintx) return arg_too_big; 776 return arg_in_range; 777} 778 779// Describe an argument out of range error 780void Arguments::describe_range_error(ArgsRange errcode) { 781 switch(errcode) { 782 case arg_too_big: 783 jio_fprintf(defaultStream::error_stream(), 784 "The specified size exceeds the maximum " 785 "representable size.\n"); 786 break; 787 case arg_too_small: 788 case arg_unreadable: 789 case arg_in_range: 790 // do nothing for now 791 break; 792 default: 793 ShouldNotReachHere(); 794 } 795} 796 797static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) { 798 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) { 799 return true; 800 } else { 801 return false; 802 } 803} 804 805static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) { 806 char* end; 807 errno = 0; 808 double v = strtod(value, &end); 809 if ((errno != 0) || (*end != 0)) { 810 return false; 811 } 812 813 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) { 814 return true; 815 } 816 return false; 817} 818 819static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) { 820 julong v; 821 int int_v; 822 intx intx_v; 823 bool is_neg = false; 824 Flag* result = Flag::find_flag(name, strlen(name)); 825 826 if (result == NULL) { 827 return false; 828 } 829 830 // Check the sign first since atomull() parses only unsigned values. 831 if (*value == '-') { 832 if (!result->is_intx() && !result->is_int()) { 833 return false; 834 } 835 value++; 836 is_neg = true; 837 } 838 if (!atomull(value, &v)) { 839 return false; 840 } 841 if (result->is_int()) { 842 int_v = (int) v; 843 if (is_neg) { 844 int_v = -int_v; 845 } 846 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS; 847 } else if (result->is_uint()) { 848 uint uint_v = (uint) v; 849 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS; 850 } else if (result->is_intx()) { 851 intx_v = (intx) v; 852 if (is_neg) { 853 intx_v = -intx_v; 854 } 855 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS; 856 } else if (result->is_uintx()) { 857 uintx uintx_v = (uintx) v; 858 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS; 859 } else if (result->is_uint64_t()) { 860 uint64_t uint64_t_v = (uint64_t) v; 861 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS; 862 } else if (result->is_size_t()) { 863 size_t size_t_v = (size_t) v; 864 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS; 865 } else { 866 return false; 867 } 868} 869 870static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) { 871 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false; 872 // Contract: CommandLineFlags always returns a pointer that needs freeing. 873 FREE_C_HEAP_ARRAY(char, value); 874 return true; 875} 876 877static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) { 878 const char* old_value = ""; 879 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false; 880 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 881 size_t new_len = strlen(new_value); 882 const char* value; 883 char* free_this_too = NULL; 884 if (old_len == 0) { 885 value = new_value; 886 } else if (new_len == 0) { 887 value = old_value; 888 } else { 889 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 890 // each new setting adds another LINE to the switch: 891 sprintf(buf, "%s\n%s", old_value, new_value); 892 value = buf; 893 free_this_too = buf; 894 } 895 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 896 // CommandLineFlags always returns a pointer that needs freeing. 897 FREE_C_HEAP_ARRAY(char, value); 898 if (free_this_too != NULL) { 899 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 900 FREE_C_HEAP_ARRAY(char, free_this_too); 901 } 902 return true; 903} 904 905const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 906 const char* real_name = real_flag_name(arg); 907 JDK_Version since = JDK_Version(); 908 switch (is_deprecated_flag(arg, &since)) { 909 case -1: 910 return NULL; // obsolete or expired, don't process normally 911 case 0: 912 return real_name; 913 case 1: { 914 if (warn) { 915 char version[256]; 916 since.to_string(version, sizeof(version)); 917 if (real_name != arg) { 918 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 919 arg, version, real_name); 920 } else { 921 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 922 arg, version); 923 } 924 } 925 return real_name; 926 } 927 } 928 ShouldNotReachHere(); 929 return NULL; 930} 931 932bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 933 934 // range of acceptable characters spelled out for portability reasons 935#define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 936#define BUFLEN 255 937 char name[BUFLEN+1]; 938 char dummy; 939 const char* real_name; 940 bool warn_if_deprecated = true; 941 942 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 943 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 944 if (real_name == NULL) { 945 return false; 946 } 947 return set_bool_flag(real_name, false, origin); 948 } 949 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 950 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 951 if (real_name == NULL) { 952 return false; 953 } 954 return set_bool_flag(real_name, true, origin); 955 } 956 957 char punct; 958 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 959 const char* value = strchr(arg, '=') + 1; 960 Flag* flag; 961 962 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 963 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 964 if (real_name == NULL) { 965 return false; 966 } 967 flag = Flag::find_flag(real_name); 968 if (flag != NULL && flag->is_ccstr()) { 969 if (flag->ccstr_accumulates()) { 970 return append_to_string_flag(real_name, value, origin); 971 } else { 972 if (value[0] == '\0') { 973 value = NULL; 974 } 975 return set_string_flag(real_name, value, origin); 976 } 977 } else { 978 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 979 } 980 } 981 982 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 983 const char* value = strchr(arg, '=') + 1; 984 // -XX:Foo:=xxx will reset the string flag to the given value. 985 if (value[0] == '\0') { 986 value = NULL; 987 } 988 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 989 if (real_name == NULL) { 990 return false; 991 } 992 return set_string_flag(real_name, value, origin); 993 } 994 995#define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 996#define SIGNED_NUMBER_RANGE "[-0123456789]" 997#define NUMBER_RANGE "[0123456789eE+-]" 998 char value[BUFLEN + 1]; 999 char value2[BUFLEN + 1]; 1000 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 1001 // Looks like a floating-point number -- try again with more lenient format string 1002 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 1003 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1004 if (real_name == NULL) { 1005 return false; 1006 } 1007 return set_fp_numeric_flag(real_name, value, origin); 1008 } 1009 } 1010 1011#define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 1012 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 1013 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1014 if (real_name == NULL) { 1015 return false; 1016 } 1017 return set_numeric_flag(real_name, value, origin); 1018 } 1019 1020 return false; 1021} 1022 1023void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 1024 assert(bldarray != NULL, "illegal argument"); 1025 1026 if (arg == NULL) { 1027 return; 1028 } 1029 1030 int new_count = *count + 1; 1031 1032 // expand the array and add arg to the last element 1033 if (*bldarray == NULL) { 1034 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 1035 } else { 1036 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 1037 } 1038 (*bldarray)[*count] = os::strdup_check_oom(arg); 1039 *count = new_count; 1040} 1041 1042void Arguments::build_jvm_args(const char* arg) { 1043 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1044} 1045 1046void Arguments::build_jvm_flags(const char* arg) { 1047 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1048} 1049 1050// utility function to return a string that concatenates all 1051// strings in a given char** array 1052const char* Arguments::build_resource_string(char** args, int count) { 1053 if (args == NULL || count == 0) { 1054 return NULL; 1055 } 1056 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 1057 for (int i = 1; i < count; i++) { 1058 length += strlen(args[i]) + 1; // add 1 for a space 1059 } 1060 char* s = NEW_RESOURCE_ARRAY(char, length); 1061 strcpy(s, args[0]); 1062 for (int j = 1; j < count; j++) { 1063 strcat(s, " "); 1064 strcat(s, args[j]); 1065 } 1066 return (const char*) s; 1067} 1068 1069void Arguments::print_on(outputStream* st) { 1070 st->print_cr("VM Arguments:"); 1071 if (num_jvm_flags() > 0) { 1072 st->print("jvm_flags: "); print_jvm_flags_on(st); 1073 st->cr(); 1074 } 1075 if (num_jvm_args() > 0) { 1076 st->print("jvm_args: "); print_jvm_args_on(st); 1077 st->cr(); 1078 } 1079 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1080 if (_java_class_path != NULL) { 1081 char* path = _java_class_path->value(); 1082 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1083 } 1084 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1085} 1086 1087void Arguments::print_summary_on(outputStream* st) { 1088 // Print the command line. Environment variables that are helpful for 1089 // reproducing the problem are written later in the hs_err file. 1090 // flags are from setting file 1091 if (num_jvm_flags() > 0) { 1092 st->print_raw("Settings File: "); 1093 print_jvm_flags_on(st); 1094 st->cr(); 1095 } 1096 // args are the command line and environment variable arguments. 1097 st->print_raw("Command Line: "); 1098 if (num_jvm_args() > 0) { 1099 print_jvm_args_on(st); 1100 } 1101 // this is the classfile and any arguments to the java program 1102 if (java_command() != NULL) { 1103 st->print("%s", java_command()); 1104 } 1105 st->cr(); 1106} 1107 1108void Arguments::print_jvm_flags_on(outputStream* st) { 1109 if (_num_jvm_flags > 0) { 1110 for (int i=0; i < _num_jvm_flags; i++) { 1111 st->print("%s ", _jvm_flags_array[i]); 1112 } 1113 } 1114} 1115 1116void Arguments::print_jvm_args_on(outputStream* st) { 1117 if (_num_jvm_args > 0) { 1118 for (int i=0; i < _num_jvm_args; i++) { 1119 st->print("%s ", _jvm_args_array[i]); 1120 } 1121 } 1122} 1123 1124bool Arguments::process_argument(const char* arg, 1125 jboolean ignore_unrecognized, 1126 Flag::Flags origin) { 1127 JDK_Version since = JDK_Version(); 1128 1129 if (parse_argument(arg, origin)) { 1130 return true; 1131 } 1132 1133 // Determine if the flag has '+', '-', or '=' characters. 1134 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1135 const char* const argname = has_plus_minus ? arg + 1 : arg; 1136 1137 size_t arg_len; 1138 const char* equal_sign = strchr(argname, '='); 1139 if (equal_sign == NULL) { 1140 arg_len = strlen(argname); 1141 } else { 1142 arg_len = equal_sign - argname; 1143 } 1144 1145 // Only make the obsolete check for valid arguments. 1146 if (arg_len <= BUFLEN) { 1147 // Construct a string which consists only of the argument name without '+', '-', or '='. 1148 char stripped_argname[BUFLEN+1]; 1149 strncpy(stripped_argname, argname, arg_len); 1150 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate. 1151 1152 if (is_obsolete_flag(stripped_argname, &since)) { 1153 char version[256]; 1154 since.to_string(version, sizeof(version)); 1155 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1156 return true; 1157 } 1158 } 1159 1160 // For locked flags, report a custom error message if available. 1161 // Otherwise, report the standard unrecognized VM option. 1162 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 1163 if (found_flag != NULL) { 1164 char locked_message_buf[BUFLEN]; 1165 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1166 if (strlen(locked_message_buf) == 0) { 1167 if (found_flag->is_bool() && !has_plus_minus) { 1168 jio_fprintf(defaultStream::error_stream(), 1169 "Missing +/- setting for VM option '%s'\n", argname); 1170 } else if (!found_flag->is_bool() && has_plus_minus) { 1171 jio_fprintf(defaultStream::error_stream(), 1172 "Unexpected +/- setting in VM option '%s'\n", argname); 1173 } else { 1174 jio_fprintf(defaultStream::error_stream(), 1175 "Improperly specified VM option '%s'\n", argname); 1176 } 1177 } else { 1178#ifdef PRODUCT 1179 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1180 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1181 if (ignore_unrecognized && mismatched) { 1182 return true; 1183 } 1184#endif 1185 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1186 } 1187 } else { 1188 if (ignore_unrecognized) { 1189 return true; 1190 } 1191 jio_fprintf(defaultStream::error_stream(), 1192 "Unrecognized VM option '%s'\n", argname); 1193 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 1194 if (fuzzy_matched != NULL) { 1195 jio_fprintf(defaultStream::error_stream(), 1196 "Did you mean '%s%s%s'? ", 1197 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1198 fuzzy_matched->_name, 1199 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1200 } 1201 } 1202 1203 // allow for commandline "commenting out" options like -XX:#+Verbose 1204 return arg[0] == '#'; 1205} 1206 1207bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1208 FILE* stream = fopen(file_name, "rb"); 1209 if (stream == NULL) { 1210 if (should_exist) { 1211 jio_fprintf(defaultStream::error_stream(), 1212 "Could not open settings file %s\n", file_name); 1213 return false; 1214 } else { 1215 return true; 1216 } 1217 } 1218 1219 char token[1024]; 1220 int pos = 0; 1221 1222 bool in_white_space = true; 1223 bool in_comment = false; 1224 bool in_quote = false; 1225 char quote_c = 0; 1226 bool result = true; 1227 1228 int c = getc(stream); 1229 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1230 if (in_white_space) { 1231 if (in_comment) { 1232 if (c == '\n') in_comment = false; 1233 } else { 1234 if (c == '#') in_comment = true; 1235 else if (!isspace(c)) { 1236 in_white_space = false; 1237 token[pos++] = c; 1238 } 1239 } 1240 } else { 1241 if (c == '\n' || (!in_quote && isspace(c))) { 1242 // token ends at newline, or at unquoted whitespace 1243 // this allows a way to include spaces in string-valued options 1244 token[pos] = '\0'; 1245 logOption(token); 1246 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1247 build_jvm_flags(token); 1248 pos = 0; 1249 in_white_space = true; 1250 in_quote = false; 1251 } else if (!in_quote && (c == '\'' || c == '"')) { 1252 in_quote = true; 1253 quote_c = c; 1254 } else if (in_quote && (c == quote_c)) { 1255 in_quote = false; 1256 } else { 1257 token[pos++] = c; 1258 } 1259 } 1260 c = getc(stream); 1261 } 1262 if (pos > 0) { 1263 token[pos] = '\0'; 1264 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1265 build_jvm_flags(token); 1266 } 1267 fclose(stream); 1268 return result; 1269} 1270 1271//============================================================================================================= 1272// Parsing of properties (-D) 1273 1274const char* Arguments::get_property(const char* key) { 1275 return PropertyList_get_value(system_properties(), key); 1276} 1277 1278bool Arguments::add_property(const char* prop) { 1279 const char* eq = strchr(prop, '='); 1280 const char* key; 1281 const char* value = ""; 1282 1283 if (eq == NULL) { 1284 // property doesn't have a value, thus use passed string 1285 key = prop; 1286 } else { 1287 // property have a value, thus extract it and save to the 1288 // allocated string 1289 size_t key_len = eq - prop; 1290 char* tmp_key = AllocateHeap(key_len + 1, mtInternal); 1291 1292 strncpy(tmp_key, prop, key_len); 1293 tmp_key[key_len] = '\0'; 1294 key = tmp_key; 1295 1296 value = &prop[key_len + 1]; 1297 } 1298 1299 if (strcmp(key, "java.compiler") == 0) { 1300 process_java_compiler_argument(value); 1301 // Record value in Arguments, but let it get passed to Java. 1302 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1303 strcmp(key, "sun.java.launcher.pid") == 0) { 1304 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1305 // private and are processed in process_sun_java_launcher_properties(); 1306 // the sun.java.launcher property is passed on to the java application 1307 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1308 PropertyList_unique_add(&_system_properties, key, value, true); 1309 } else { 1310 if (strcmp(key, "sun.java.command") == 0) { 1311 if (_java_command != NULL) { 1312 os::free(_java_command); 1313 } 1314 _java_command = os::strdup_check_oom(value, mtInternal); 1315 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1316 if (_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1317 assert(_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1318 os::free((void *)_java_vendor_url_bug); 1319 } 1320 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1321 // its value without going through the property list or making a Java call. 1322 _java_vendor_url_bug = os::strdup_check_oom(value, mtInternal); 1323 } 1324 1325 // Create new property and add at the end of the list 1326 PropertyList_unique_add(&_system_properties, key, value); 1327 } 1328 1329 if (key != prop) { 1330 // SystemProperty copy passed value, thus free previously allocated 1331 // memory 1332 FreeHeap((void *)key); 1333 } 1334 1335 return true; 1336} 1337 1338//=========================================================================================================== 1339// Setting int/mixed/comp mode flags 1340 1341void Arguments::set_mode_flags(Mode mode) { 1342 // Set up default values for all flags. 1343 // If you add a flag to any of the branches below, 1344 // add a default value for it here. 1345 set_java_compiler(false); 1346 _mode = mode; 1347 1348 // Ensure Agent_OnLoad has the correct initial values. 1349 // This may not be the final mode; mode may change later in onload phase. 1350 PropertyList_unique_add(&_system_properties, "java.vm.info", 1351 VM_Version::vm_info_string(), false); 1352 1353 UseInterpreter = true; 1354 UseCompiler = true; 1355 UseLoopCounter = true; 1356 1357 // Default values may be platform/compiler dependent - 1358 // use the saved values 1359 ClipInlining = Arguments::_ClipInlining; 1360 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1361 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1362 BackgroundCompilation = Arguments::_BackgroundCompilation; 1363 if (TieredCompilation) { 1364 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1365 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1366 } 1367 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1368 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1369 } 1370 } 1371 1372 // Change from defaults based on mode 1373 switch (mode) { 1374 default: 1375 ShouldNotReachHere(); 1376 break; 1377 case _int: 1378 UseCompiler = false; 1379 UseLoopCounter = false; 1380 AlwaysCompileLoopMethods = false; 1381 UseOnStackReplacement = false; 1382 break; 1383 case _mixed: 1384 // same as default 1385 break; 1386 case _comp: 1387 UseInterpreter = false; 1388 BackgroundCompilation = false; 1389 ClipInlining = false; 1390 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1391 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1392 // compile a level 4 (C2) and then continue executing it. 1393 if (TieredCompilation) { 1394 Tier3InvokeNotifyFreqLog = 0; 1395 Tier4InvocationThreshold = 0; 1396 } 1397 break; 1398 } 1399} 1400 1401#if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS 1402// Conflict: required to use shared spaces (-Xshare:on), but 1403// incompatible command line options were chosen. 1404 1405static void no_shared_spaces(const char* message) { 1406 if (RequireSharedSpaces) { 1407 jio_fprintf(defaultStream::error_stream(), 1408 "Class data sharing is inconsistent with other specified options.\n"); 1409 vm_exit_during_initialization("Unable to use shared archive.", message); 1410 } else { 1411 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1412 } 1413} 1414#endif 1415 1416// Returns threshold scaled with the value of scale. 1417// If scale < 0.0, threshold is returned without scaling. 1418intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1419 if (scale == 1.0 || scale < 0.0) { 1420 return threshold; 1421 } else { 1422 return (intx)(threshold * scale); 1423 } 1424} 1425 1426// Returns freq_log scaled with the value of scale. 1427// Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1428// If scale < 0.0, freq_log is returned without scaling. 1429intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1430 // Check if scaling is necessary or if negative value was specified. 1431 if (scale == 1.0 || scale < 0.0) { 1432 return freq_log; 1433 } 1434 // Check values to avoid calculating log2 of 0. 1435 if (scale == 0.0 || freq_log == 0) { 1436 return 0; 1437 } 1438 // Determine the maximum notification frequency value currently supported. 1439 // The largest mask value that the interpreter/C1 can handle is 1440 // of length InvocationCounter::number_of_count_bits. Mask values are always 1441 // one bit shorter then the value of the notification frequency. Set 1442 // max_freq_bits accordingly. 1443 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1444 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1445 if (scaled_freq == 0) { 1446 // Return 0 right away to avoid calculating log2 of 0. 1447 return 0; 1448 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1449 return max_freq_bits; 1450 } else { 1451 return log2_intptr(scaled_freq); 1452 } 1453} 1454 1455void Arguments::set_tiered_flags() { 1456 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1457 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1458 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1459 } 1460 if (CompilationPolicyChoice < 2) { 1461 vm_exit_during_initialization( 1462 "Incompatible compilation policy selected", NULL); 1463 } 1464 // Increase the code cache size - tiered compiles a lot more. 1465 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1466 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1467 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1468 } 1469 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1470 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1471 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1472 } 1473 if (!UseInterpreter) { // -Xcomp 1474 Tier3InvokeNotifyFreqLog = 0; 1475 Tier4InvocationThreshold = 0; 1476 } 1477 1478 if (CompileThresholdScaling < 0) { 1479 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1480 } 1481 1482 // Scale tiered compilation thresholds. 1483 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1484 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1485 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1486 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1487 1488 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1489 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1490 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1491 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1492 1493 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1494 // once these thresholds become supported. 1495 1496 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1497 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1498 1499 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1500 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1501 1502 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1503 1504 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1505 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1506 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1507 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1508 } 1509} 1510 1511#if INCLUDE_ALL_GCS 1512static void disable_adaptive_size_policy(const char* collector_name) { 1513 if (UseAdaptiveSizePolicy) { 1514 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1515 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1516 collector_name); 1517 } 1518 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1519 } 1520} 1521 1522void Arguments::set_parnew_gc_flags() { 1523 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1524 "control point invariant"); 1525 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1526 assert(UseParNewGC, "ParNew should always be used with CMS"); 1527 1528 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1529 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1530 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1531 } else if (ParallelGCThreads == 0) { 1532 jio_fprintf(defaultStream::error_stream(), 1533 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1534 vm_exit(1); 1535 } 1536 1537 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1538 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1539 // we set them to 1024 and 1024. 1540 // See CR 6362902. 1541 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1542 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1543 } 1544 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1545 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1546 } 1547 1548 // When using compressed oops, we use local overflow stacks, 1549 // rather than using a global overflow list chained through 1550 // the klass word of the object's pre-image. 1551 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1552 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1553 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1554 } 1555 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1556 } 1557 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1558} 1559 1560// Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1561// sparc/solaris for certain applications, but would gain from 1562// further optimization and tuning efforts, and would almost 1563// certainly gain from analysis of platform and environment. 1564void Arguments::set_cms_and_parnew_gc_flags() { 1565 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1566 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1567 assert(UseParNewGC, "ParNew should always be used with CMS"); 1568 1569 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1570 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1571 1572 set_parnew_gc_flags(); 1573 1574 size_t max_heap = align_size_down(MaxHeapSize, 1575 CardTableRS::ct_max_alignment_constraint()); 1576 1577 // Now make adjustments for CMS 1578 intx tenuring_default = (intx)6; 1579 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1580 1581 // Preferred young gen size for "short" pauses: 1582 // upper bound depends on # of threads and NewRatio. 1583 const size_t preferred_max_new_size_unaligned = 1584 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads)); 1585 size_t preferred_max_new_size = 1586 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1587 1588 // Unless explicitly requested otherwise, size young gen 1589 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1590 1591 // If either MaxNewSize or NewRatio is set on the command line, 1592 // assume the user is trying to set the size of the young gen. 1593 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1594 1595 // Set MaxNewSize to our calculated preferred_max_new_size unless 1596 // NewSize was set on the command line and it is larger than 1597 // preferred_max_new_size. 1598 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1599 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1600 } else { 1601 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size); 1602 } 1603 if (PrintGCDetails && Verbose) { 1604 // Too early to use gclog_or_tty 1605 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1606 } 1607 1608 // Code along this path potentially sets NewSize and OldSize 1609 if (PrintGCDetails && Verbose) { 1610 // Too early to use gclog_or_tty 1611 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1612 " initial_heap_size: " SIZE_FORMAT 1613 " max_heap: " SIZE_FORMAT, 1614 min_heap_size(), InitialHeapSize, max_heap); 1615 } 1616 size_t min_new = preferred_max_new_size; 1617 if (FLAG_IS_CMDLINE(NewSize)) { 1618 min_new = NewSize; 1619 } 1620 if (max_heap > min_new && min_heap_size() > min_new) { 1621 // Unless explicitly requested otherwise, make young gen 1622 // at least min_new, and at most preferred_max_new_size. 1623 if (FLAG_IS_DEFAULT(NewSize)) { 1624 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new)); 1625 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize)); 1626 if (PrintGCDetails && Verbose) { 1627 // Too early to use gclog_or_tty 1628 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1629 } 1630 } 1631 // Unless explicitly requested otherwise, size old gen 1632 // so it's NewRatio x of NewSize. 1633 if (FLAG_IS_DEFAULT(OldSize)) { 1634 if (max_heap > NewSize) { 1635 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1636 if (PrintGCDetails && Verbose) { 1637 // Too early to use gclog_or_tty 1638 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1639 } 1640 } 1641 } 1642 } 1643 } 1644 // Unless explicitly requested otherwise, definitely 1645 // promote all objects surviving "tenuring_default" scavenges. 1646 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1647 FLAG_IS_DEFAULT(SurvivorRatio)) { 1648 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1649 } 1650 // If we decided above (or user explicitly requested) 1651 // `promote all' (via MaxTenuringThreshold := 0), 1652 // prefer minuscule survivor spaces so as not to waste 1653 // space for (non-existent) survivors 1654 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1655 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1656 } 1657 1658 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1659 // but rather the number of free blocks of a given size that are used when 1660 // replenishing the local per-worker free list caches. 1661 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1662 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1663 // OldPLAB sizing manually turned off: Use a larger default setting, 1664 // unless it was manually specified. This is because a too-low value 1665 // will slow down scavenges. 1666 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166 1667 } else { 1668 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1669 } 1670 } 1671 1672 // If either of the static initialization defaults have changed, note this 1673 // modification. 1674 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1675 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1676 } 1677 1678 if (!ClassUnloading) { 1679 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false); 1680 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false); 1681 } 1682 1683 if (PrintGCDetails && Verbose) { 1684 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1685 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1686 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1687 } 1688} 1689#endif // INCLUDE_ALL_GCS 1690 1691void set_object_alignment() { 1692 // Object alignment. 1693 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1694 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1695 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1696 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1697 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1698 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1699 1700 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1701 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1702 1703 // Oop encoding heap max 1704 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1705 1706 if (SurvivorAlignmentInBytes == 0) { 1707 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1708 } 1709 1710#if INCLUDE_ALL_GCS 1711 // Set CMS global values 1712 CompactibleFreeListSpace::set_cms_values(); 1713#endif // INCLUDE_ALL_GCS 1714} 1715 1716size_t Arguments::max_heap_for_compressed_oops() { 1717 // Avoid sign flip. 1718 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1719 // We need to fit both the NULL page and the heap into the memory budget, while 1720 // keeping alignment constraints of the heap. To guarantee the latter, as the 1721 // NULL page is located before the heap, we pad the NULL page to the conservative 1722 // maximum alignment that the GC may ever impose upon the heap. 1723 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1724 _conservative_max_heap_alignment); 1725 1726 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1727 NOT_LP64(ShouldNotReachHere(); return 0); 1728} 1729 1730bool Arguments::should_auto_select_low_pause_collector() { 1731 if (UseAutoGCSelectPolicy && 1732 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1733 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1734 if (PrintGCDetails) { 1735 // Cannot use gclog_or_tty yet. 1736 tty->print_cr("Automatic selection of the low pause collector" 1737 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1738 } 1739 return true; 1740 } 1741 return false; 1742} 1743 1744void Arguments::set_use_compressed_oops() { 1745#ifndef ZERO 1746#ifdef _LP64 1747 // MaxHeapSize is not set up properly at this point, but 1748 // the only value that can override MaxHeapSize if we are 1749 // to use UseCompressedOops is InitialHeapSize. 1750 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1751 1752 if (max_heap_size <= max_heap_for_compressed_oops()) { 1753#if !defined(COMPILER1) || defined(TIERED) 1754 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1755 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1756 } 1757#endif 1758 } else { 1759 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1760 warning("Max heap size too large for Compressed Oops"); 1761 FLAG_SET_DEFAULT(UseCompressedOops, false); 1762 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1763 } 1764 } 1765#endif // _LP64 1766#endif // ZERO 1767} 1768 1769 1770// NOTE: set_use_compressed_klass_ptrs() must be called after calling 1771// set_use_compressed_oops(). 1772void Arguments::set_use_compressed_klass_ptrs() { 1773#ifndef ZERO 1774#ifdef _LP64 1775 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1776 if (!UseCompressedOops) { 1777 if (UseCompressedClassPointers) { 1778 warning("UseCompressedClassPointers requires UseCompressedOops"); 1779 } 1780 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1781 } else { 1782 // Turn on UseCompressedClassPointers too 1783 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1784 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1785 } 1786 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1787 if (UseCompressedClassPointers) { 1788 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1789 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1790 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1791 } 1792 } 1793 } 1794#endif // _LP64 1795#endif // !ZERO 1796} 1797 1798void Arguments::set_conservative_max_heap_alignment() { 1799 // The conservative maximum required alignment for the heap is the maximum of 1800 // the alignments imposed by several sources: any requirements from the heap 1801 // itself, the collector policy and the maximum page size we may run the VM 1802 // with. 1803 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1804#if INCLUDE_ALL_GCS 1805 if (UseParallelGC) { 1806 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1807 } else if (UseG1GC) { 1808 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1809 } 1810#endif // INCLUDE_ALL_GCS 1811 _conservative_max_heap_alignment = MAX4(heap_alignment, 1812 (size_t)os::vm_allocation_granularity(), 1813 os::max_page_size(), 1814 CollectorPolicy::compute_heap_alignment()); 1815} 1816 1817void Arguments::select_gc_ergonomically() { 1818 if (os::is_server_class_machine()) { 1819 if (should_auto_select_low_pause_collector()) { 1820 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1821 } else { 1822#if defined(JAVASE_EMBEDDED) 1823 FLAG_SET_ERGO(bool, UseParallelGC, true); 1824#else 1825 FLAG_SET_ERGO(bool, UseG1GC, true); 1826#endif 1827 } 1828 } else { 1829 FLAG_SET_ERGO(bool, UseSerialGC, true); 1830 } 1831} 1832 1833void Arguments::select_gc() { 1834 if (!gc_selected()) { 1835 select_gc_ergonomically(); 1836 guarantee(gc_selected(), "No GC selected"); 1837 } 1838} 1839 1840void Arguments::set_ergonomics_flags() { 1841 select_gc(); 1842 1843#if defined(COMPILER2) || INCLUDE_JVMCI 1844 // Shared spaces work fine with other GCs but causes bytecode rewriting 1845 // to be disabled, which hurts interpreter performance and decreases 1846 // server performance. When -server is specified, keep the default off 1847 // unless it is asked for. Future work: either add bytecode rewriting 1848 // at link time, or rewrite bytecodes in non-shared methods. 1849 if (!DumpSharedSpaces && !RequireSharedSpaces && 1850 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1851 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1852 } 1853#endif 1854 1855 set_conservative_max_heap_alignment(); 1856 1857#ifndef ZERO 1858#ifdef _LP64 1859 set_use_compressed_oops(); 1860 1861 // set_use_compressed_klass_ptrs() must be called after calling 1862 // set_use_compressed_oops(). 1863 set_use_compressed_klass_ptrs(); 1864 1865 // Also checks that certain machines are slower with compressed oops 1866 // in vm_version initialization code. 1867#endif // _LP64 1868#endif // !ZERO 1869 1870 CodeCacheExtensions::set_ergonomics_flags(); 1871} 1872 1873void Arguments::set_parallel_gc_flags() { 1874 assert(UseParallelGC || UseParallelOldGC, "Error"); 1875 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1876 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1877 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1878 } 1879 FLAG_SET_DEFAULT(UseParallelGC, true); 1880 1881 // If no heap maximum was requested explicitly, use some reasonable fraction 1882 // of the physical memory, up to a maximum of 1GB. 1883 FLAG_SET_DEFAULT(ParallelGCThreads, 1884 Abstract_VM_Version::parallel_worker_threads()); 1885 if (ParallelGCThreads == 0) { 1886 jio_fprintf(defaultStream::error_stream(), 1887 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1888 vm_exit(1); 1889 } 1890 1891 if (UseAdaptiveSizePolicy) { 1892 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1893 // unless the user actually sets these flags. 1894 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1895 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1896 } 1897 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1898 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1899 } 1900 } 1901 1902 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1903 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1904 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1905 // See CR 6362902 for details. 1906 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1907 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1908 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1909 } 1910 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1911 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1912 } 1913 } 1914 1915 if (UseParallelOldGC) { 1916 // Par compact uses lower default values since they are treated as 1917 // minimums. These are different defaults because of the different 1918 // interpretation and are not ergonomically set. 1919 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1920 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1921 } 1922 } 1923} 1924 1925void Arguments::set_g1_gc_flags() { 1926 assert(UseG1GC, "Error"); 1927#if defined(COMPILER1) || INCLUDE_JVMCI 1928 FastTLABRefill = false; 1929#endif 1930 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1931 if (ParallelGCThreads == 0) { 1932 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1933 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1934 } 1935 1936#if INCLUDE_ALL_GCS 1937 if (G1ConcRefinementThreads == 0) { 1938 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads); 1939 } 1940#endif 1941 1942 // MarkStackSize will be set (if it hasn't been set by the user) 1943 // when concurrent marking is initialized. 1944 // Its value will be based upon the number of parallel marking threads. 1945 // But we do set the maximum mark stack size here. 1946 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1947 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1948 } 1949 1950 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1951 // In G1, we want the default GC overhead goal to be higher than 1952 // say in PS. So we set it here to 10%. Otherwise the heap might 1953 // be expanded more aggressively than we would like it to. In 1954 // fact, even 10% seems to not be high enough in some cases 1955 // (especially small GC stress tests that the main thing they do 1956 // is allocation). We might consider increase it further. 1957 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1958 } 1959 1960 if (PrintGCDetails && Verbose) { 1961 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1962 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1963 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1964 } 1965} 1966 1967#if !INCLUDE_ALL_GCS 1968#ifdef ASSERT 1969static bool verify_serial_gc_flags() { 1970 return (UseSerialGC && 1971 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC || 1972 UseParallelGC || UseParallelOldGC)); 1973} 1974#endif // ASSERT 1975#endif // INCLUDE_ALL_GCS 1976 1977void Arguments::set_gc_specific_flags() { 1978#if INCLUDE_ALL_GCS 1979 // Set per-collector flags 1980 if (UseParallelGC || UseParallelOldGC) { 1981 set_parallel_gc_flags(); 1982 } else if (UseConcMarkSweepGC) { 1983 set_cms_and_parnew_gc_flags(); 1984 } else if (UseG1GC) { 1985 set_g1_gc_flags(); 1986 } 1987 if (AssumeMP && !UseSerialGC) { 1988 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 1989 warning("If the number of processors is expected to increase from one, then" 1990 " you should configure the number of parallel GC threads appropriately" 1991 " using -XX:ParallelGCThreads=N"); 1992 } 1993 } 1994 if (MinHeapFreeRatio == 100) { 1995 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1996 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 1997 } 1998#else // INCLUDE_ALL_GCS 1999 assert(verify_serial_gc_flags(), "SerialGC unset"); 2000#endif // INCLUDE_ALL_GCS 2001} 2002 2003julong Arguments::limit_by_allocatable_memory(julong limit) { 2004 julong max_allocatable; 2005 julong result = limit; 2006 if (os::has_allocatable_memory_limit(&max_allocatable)) { 2007 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 2008 } 2009 return result; 2010} 2011 2012// Use static initialization to get the default before parsing 2013static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 2014 2015void Arguments::set_heap_size() { 2016 const julong phys_mem = 2017 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 2018 : (julong)MaxRAM; 2019 2020 // If the maximum heap size has not been set with -Xmx, 2021 // then set it as fraction of the size of physical memory, 2022 // respecting the maximum and minimum sizes of the heap. 2023 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2024 julong reasonable_max = phys_mem / MaxRAMFraction; 2025 2026 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 2027 // Small physical memory, so use a minimum fraction of it for the heap 2028 reasonable_max = phys_mem / MinRAMFraction; 2029 } else { 2030 // Not-small physical memory, so require a heap at least 2031 // as large as MaxHeapSize 2032 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 2033 } 2034 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 2035 // Limit the heap size to ErgoHeapSizeLimit 2036 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 2037 } 2038 if (UseCompressedOops) { 2039 // Limit the heap size to the maximum possible when using compressed oops 2040 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 2041 2042 // HeapBaseMinAddress can be greater than default but not less than. 2043 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 2044 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 2045 // matches compressed oops printing flags 2046 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 2047 jio_fprintf(defaultStream::error_stream(), 2048 "HeapBaseMinAddress must be at least " SIZE_FORMAT 2049 " (" SIZE_FORMAT "G) which is greater than value given " 2050 SIZE_FORMAT "\n", 2051 DefaultHeapBaseMinAddress, 2052 DefaultHeapBaseMinAddress/G, 2053 HeapBaseMinAddress); 2054 } 2055 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 2056 } 2057 } 2058 2059 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 2060 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 2061 // but it should be not less than default MaxHeapSize. 2062 max_coop_heap -= HeapBaseMinAddress; 2063 } 2064 reasonable_max = MIN2(reasonable_max, max_coop_heap); 2065 } 2066 reasonable_max = limit_by_allocatable_memory(reasonable_max); 2067 2068 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 2069 // An initial heap size was specified on the command line, 2070 // so be sure that the maximum size is consistent. Done 2071 // after call to limit_by_allocatable_memory because that 2072 // method might reduce the allocation size. 2073 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 2074 } 2075 2076 if (PrintGCDetails && Verbose) { 2077 // Cannot use gclog_or_tty yet. 2078 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 2079 } 2080 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 2081 } 2082 2083 // If the minimum or initial heap_size have not been set or requested to be set 2084 // ergonomically, set them accordingly. 2085 if (InitialHeapSize == 0 || min_heap_size() == 0) { 2086 julong reasonable_minimum = (julong)(OldSize + NewSize); 2087 2088 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 2089 2090 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 2091 2092 if (InitialHeapSize == 0) { 2093 julong reasonable_initial = phys_mem / InitialRAMFraction; 2094 2095 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 2096 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 2097 2098 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 2099 2100 if (PrintGCDetails && Verbose) { 2101 // Cannot use gclog_or_tty yet. 2102 tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 2103 } 2104 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 2105 } 2106 // If the minimum heap size has not been set (via -Xms), 2107 // synchronize with InitialHeapSize to avoid errors with the default value. 2108 if (min_heap_size() == 0) { 2109 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 2110 if (PrintGCDetails && Verbose) { 2111 // Cannot use gclog_or_tty yet. 2112 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 2113 } 2114 } 2115 } 2116} 2117 2118// This option inspects the machine and attempts to set various 2119// parameters to be optimal for long-running, memory allocation 2120// intensive jobs. It is intended for machines with large 2121// amounts of cpu and memory. 2122jint Arguments::set_aggressive_heap_flags() { 2123 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2124 // VM, but we may not be able to represent the total physical memory 2125 // available (like having 8gb of memory on a box but using a 32bit VM). 2126 // Thus, we need to make sure we're using a julong for intermediate 2127 // calculations. 2128 julong initHeapSize; 2129 julong total_memory = os::physical_memory(); 2130 2131 if (total_memory < (julong) 256 * M) { 2132 jio_fprintf(defaultStream::error_stream(), 2133 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2134 vm_exit(1); 2135 } 2136 2137 // The heap size is half of available memory, or (at most) 2138 // all of possible memory less 160mb (leaving room for the OS 2139 // when using ISM). This is the maximum; because adaptive sizing 2140 // is turned on below, the actual space used may be smaller. 2141 2142 initHeapSize = MIN2(total_memory / (julong) 2, 2143 total_memory - (julong) 160 * M); 2144 2145 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2146 2147 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2148 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) { 2149 return JNI_EINVAL; 2150 } 2151 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) { 2152 return JNI_EINVAL; 2153 } 2154 // Currently the minimum size and the initial heap sizes are the same. 2155 set_min_heap_size(initHeapSize); 2156 } 2157 if (FLAG_IS_DEFAULT(NewSize)) { 2158 // Make the young generation 3/8ths of the total heap. 2159 if (FLAG_SET_CMDLINE(size_t, NewSize, 2160 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) { 2161 return JNI_EINVAL; 2162 } 2163 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) { 2164 return JNI_EINVAL; 2165 } 2166 } 2167 2168#if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 2169 FLAG_SET_DEFAULT(UseLargePages, true); 2170#endif 2171 2172 // Increase some data structure sizes for efficiency 2173 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) { 2174 return JNI_EINVAL; 2175 } 2176 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) { 2177 return JNI_EINVAL; 2178 } 2179 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) { 2180 return JNI_EINVAL; 2181 } 2182 2183 // See the OldPLABSize comment below, but replace 'after promotion' 2184 // with 'after copying'. YoungPLABSize is the size of the survivor 2185 // space per-gc-thread buffers. The default is 4kw. 2186 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words 2187 return JNI_EINVAL; 2188 } 2189 2190 // OldPLABSize is the size of the buffers in the old gen that 2191 // UseParallelGC uses to promote live data that doesn't fit in the 2192 // survivor spaces. At any given time, there's one for each gc thread. 2193 // The default size is 1kw. These buffers are rarely used, since the 2194 // survivor spaces are usually big enough. For specjbb, however, there 2195 // are occasions when there's lots of live data in the young gen 2196 // and we end up promoting some of it. We don't have a definite 2197 // explanation for why bumping OldPLABSize helps, but the theory 2198 // is that a bigger PLAB results in retaining something like the 2199 // original allocation order after promotion, which improves mutator 2200 // locality. A minor effect may be that larger PLABs reduce the 2201 // number of PLAB allocation events during gc. The value of 8kw 2202 // was arrived at by experimenting with specjbb. 2203 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words 2204 return JNI_EINVAL; 2205 } 2206 2207 // Enable parallel GC and adaptive generation sizing 2208 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) { 2209 return JNI_EINVAL; 2210 } 2211 FLAG_SET_DEFAULT(ParallelGCThreads, 2212 Abstract_VM_Version::parallel_worker_threads()); 2213 2214 // Encourage steady state memory management 2215 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) { 2216 return JNI_EINVAL; 2217 } 2218 2219 // This appears to improve mutator locality 2220 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 2221 return JNI_EINVAL; 2222 } 2223 2224 // Get around early Solaris scheduling bug 2225 // (affinity vs other jobs on system) 2226 // but disallow DR and offlining (5008695). 2227 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) { 2228 return JNI_EINVAL; 2229 } 2230 2231 return JNI_OK; 2232} 2233 2234// This must be called after ergonomics. 2235void Arguments::set_bytecode_flags() { 2236 if (!RewriteBytecodes) { 2237 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 2238 } 2239} 2240 2241// Aggressive optimization flags -XX:+AggressiveOpts 2242jint Arguments::set_aggressive_opts_flags() { 2243#ifdef COMPILER2 2244 if (AggressiveUnboxing) { 2245 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2246 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2247 } else if (!EliminateAutoBox) { 2248 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 2249 AggressiveUnboxing = false; 2250 } 2251 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 2252 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 2253 } else if (!DoEscapeAnalysis) { 2254 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 2255 AggressiveUnboxing = false; 2256 } 2257 } 2258 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2259 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2260 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2261 } 2262 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2263 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 2264 } 2265 2266 // Feed the cache size setting into the JDK 2267 char buffer[1024]; 2268 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2269 if (!add_property(buffer)) { 2270 return JNI_ENOMEM; 2271 } 2272 } 2273 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 2274 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 2275 } 2276#endif 2277 2278 if (AggressiveOpts) { 2279// Sample flag setting code 2280// if (FLAG_IS_DEFAULT(EliminateZeroing)) { 2281// FLAG_SET_DEFAULT(EliminateZeroing, true); 2282// } 2283 } 2284 2285 return JNI_OK; 2286} 2287 2288//=========================================================================================================== 2289// Parsing of java.compiler property 2290 2291void Arguments::process_java_compiler_argument(const char* arg) { 2292 // For backwards compatibility, Djava.compiler=NONE or "" 2293 // causes us to switch to -Xint mode UNLESS -Xdebug 2294 // is also specified. 2295 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2296 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2297 } 2298} 2299 2300void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2301 _sun_java_launcher = os::strdup_check_oom(launcher); 2302} 2303 2304bool Arguments::created_by_java_launcher() { 2305 assert(_sun_java_launcher != NULL, "property must have value"); 2306 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2307} 2308 2309bool Arguments::sun_java_launcher_is_altjvm() { 2310 return _sun_java_launcher_is_altjvm; 2311} 2312 2313//=========================================================================================================== 2314// Parsing of main arguments 2315 2316// check if do gclog rotation 2317// +UseGCLogFileRotation is a must, 2318// no gc log rotation when log file not supplied or 2319// NumberOfGCLogFiles is 0 2320void check_gclog_consistency() { 2321 if (UseGCLogFileRotation) { 2322 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { 2323 jio_fprintf(defaultStream::output_stream(), 2324 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" 2325 "where num_of_file > 0\n" 2326 "GC log rotation is turned off\n"); 2327 UseGCLogFileRotation = false; 2328 } 2329 } 2330 2331 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { 2332 if (FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K) == Flag::SUCCESS) { 2333 jio_fprintf(defaultStream::output_stream(), 2334 "GCLogFileSize changed to minimum 8K\n"); 2335 } 2336 } 2337} 2338 2339// This function is called for -Xloggc:<filename>, it can be used 2340// to check if a given file name(or string) conforms to the following 2341// specification: 2342// A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 2343// %p and %t only allowed once. We only limit usage of filename not path 2344bool is_filename_valid(const char *file_name) { 2345 const char* p = file_name; 2346 char file_sep = os::file_separator()[0]; 2347 const char* cp; 2348 // skip prefix path 2349 for (cp = file_name; *cp != '\0'; cp++) { 2350 if (*cp == '/' || *cp == file_sep) { 2351 p = cp + 1; 2352 } 2353 } 2354 2355 int count_p = 0; 2356 int count_t = 0; 2357 while (*p != '\0') { 2358 if ((*p >= '0' && *p <= '9') || 2359 (*p >= 'A' && *p <= 'Z') || 2360 (*p >= 'a' && *p <= 'z') || 2361 *p == '-' || 2362 *p == '_' || 2363 *p == '.') { 2364 p++; 2365 continue; 2366 } 2367 if (*p == '%') { 2368 if(*(p + 1) == 'p') { 2369 p += 2; 2370 count_p ++; 2371 continue; 2372 } 2373 if (*(p + 1) == 't') { 2374 p += 2; 2375 count_t ++; 2376 continue; 2377 } 2378 } 2379 return false; 2380 } 2381 return count_p < 2 && count_t < 2; 2382} 2383 2384// Check consistency of GC selection 2385bool Arguments::check_gc_consistency() { 2386 check_gclog_consistency(); 2387 // Ensure that the user has not selected conflicting sets 2388 // of collectors. 2389 uint i = 0; 2390 if (UseSerialGC) i++; 2391 if (UseConcMarkSweepGC) i++; 2392 if (UseParallelGC || UseParallelOldGC) i++; 2393 if (UseG1GC) i++; 2394 if (i > 1) { 2395 jio_fprintf(defaultStream::error_stream(), 2396 "Conflicting collector combinations in option list; " 2397 "please refer to the release notes for the combinations " 2398 "allowed\n"); 2399 return false; 2400 } 2401 2402 if (UseConcMarkSweepGC && !UseParNewGC) { 2403 jio_fprintf(defaultStream::error_stream(), 2404 "It is not possible to combine the DefNew young collector with the CMS collector.\n"); 2405 return false; 2406 } 2407 2408 if (UseParNewGC && !UseConcMarkSweepGC) { 2409 jio_fprintf(defaultStream::error_stream(), 2410 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n"); 2411 return false; 2412 } 2413 2414 return true; 2415} 2416 2417// Check the consistency of vm_init_args 2418bool Arguments::check_vm_args_consistency() { 2419 // Method for adding checks for flag consistency. 2420 // The intent is to warn the user of all possible conflicts, 2421 // before returning an error. 2422 // Note: Needs platform-dependent factoring. 2423 bool status = true; 2424 2425 if (TLABRefillWasteFraction == 0) { 2426 jio_fprintf(defaultStream::error_stream(), 2427 "TLABRefillWasteFraction should be a denominator, " 2428 "not " SIZE_FORMAT "\n", 2429 TLABRefillWasteFraction); 2430 status = false; 2431 } 2432 2433 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2434 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2435 } 2436 2437 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2438 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2439 } 2440 2441 if (GCTimeLimit == 100) { 2442 // Turn off gc-overhead-limit-exceeded checks 2443 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2444 } 2445 2446 status = status && check_gc_consistency(); 2447 2448 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2449 // insists that we hold the requisite locks so that the iteration is 2450 // MT-safe. For the verification at start-up and shut-down, we don't 2451 // yet have a good way of acquiring and releasing these locks, 2452 // which are not visible at the CollectedHeap level. We want to 2453 // be able to acquire these locks and then do the iteration rather 2454 // than just disable the lock verification. This will be fixed under 2455 // bug 4788986. 2456 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2457 if (VerifyDuringStartup) { 2458 warning("Heap verification at start-up disabled " 2459 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2460 VerifyDuringStartup = false; // Disable verification at start-up 2461 } 2462 2463 if (VerifyBeforeExit) { 2464 warning("Heap verification at shutdown disabled " 2465 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2466 VerifyBeforeExit = false; // Disable verification at shutdown 2467 } 2468 } 2469 2470 if (PrintNMTStatistics) { 2471#if INCLUDE_NMT 2472 if (MemTracker::tracking_level() == NMT_off) { 2473#endif // INCLUDE_NMT 2474 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2475 PrintNMTStatistics = false; 2476#if INCLUDE_NMT 2477 } 2478#endif 2479 } 2480#if INCLUDE_JVMCI 2481 if (EnableJVMCI) { 2482 if (!ScavengeRootsInCode) { 2483 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled"); 2484 ScavengeRootsInCode = 1; 2485 } 2486 if (FLAG_IS_DEFAULT(TypeProfileLevel)) { 2487 TypeProfileLevel = 0; 2488 } 2489 if (UseJVMCICompiler) { 2490 if (FLAG_IS_DEFAULT(TypeProfileWidth)) { 2491 TypeProfileWidth = 8; 2492 } 2493 } 2494 } 2495#endif 2496 2497 // Check lower bounds of the code cache 2498 // Template Interpreter code is approximately 3X larger in debug builds. 2499 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2500 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2501 jio_fprintf(defaultStream::error_stream(), 2502 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2503 os::vm_page_size()/K); 2504 status = false; 2505 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2506 jio_fprintf(defaultStream::error_stream(), 2507 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2508 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2509 status = false; 2510 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2511 jio_fprintf(defaultStream::error_stream(), 2512 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2513 min_code_cache_size/K); 2514 status = false; 2515 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2516 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2517 jio_fprintf(defaultStream::error_stream(), 2518 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2519 CODE_CACHE_SIZE_LIMIT/M); 2520 status = false; 2521 } else if (NonNMethodCodeHeapSize < min_code_cache_size) { 2522 jio_fprintf(defaultStream::error_stream(), 2523 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2524 min_code_cache_size/K); 2525 status = false; 2526 } 2527 2528 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2529 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2530 } 2531 2532 return status; 2533} 2534 2535bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2536 const char* option_type) { 2537 if (ignore) return false; 2538 2539 const char* spacer = " "; 2540 if (option_type == NULL) { 2541 option_type = ++spacer; // Set both to the empty string. 2542 } 2543 2544 if (os::obsolete_option(option)) { 2545 jio_fprintf(defaultStream::error_stream(), 2546 "Obsolete %s%soption: %s\n", option_type, spacer, 2547 option->optionString); 2548 return false; 2549 } else { 2550 jio_fprintf(defaultStream::error_stream(), 2551 "Unrecognized %s%soption: %s\n", option_type, spacer, 2552 option->optionString); 2553 return true; 2554 } 2555} 2556 2557static const char* user_assertion_options[] = { 2558 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2559}; 2560 2561static const char* system_assertion_options[] = { 2562 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2563}; 2564 2565bool Arguments::parse_uintx(const char* value, 2566 uintx* uintx_arg, 2567 uintx min_size) { 2568 2569 // Check the sign first since atomull() parses only unsigned values. 2570 bool value_is_positive = !(*value == '-'); 2571 2572 if (value_is_positive) { 2573 julong n; 2574 bool good_return = atomull(value, &n); 2575 if (good_return) { 2576 bool above_minimum = n >= min_size; 2577 bool value_is_too_large = n > max_uintx; 2578 2579 if (above_minimum && !value_is_too_large) { 2580 *uintx_arg = n; 2581 return true; 2582 } 2583 } 2584 } 2585 return false; 2586} 2587 2588Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2589 julong* long_arg, 2590 julong min_size) { 2591 if (!atomull(s, long_arg)) return arg_unreadable; 2592 return check_memory_size(*long_arg, min_size); 2593} 2594 2595// Parse JavaVMInitArgs structure 2596 2597jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2598 const JavaVMInitArgs *java_options_args, 2599 const JavaVMInitArgs *cmd_line_args) { 2600 // For components of the system classpath. 2601 SysClassPath scp(Arguments::get_sysclasspath()); 2602 bool scp_assembly_required = false; 2603 2604 // Save default settings for some mode flags 2605 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2606 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2607 Arguments::_ClipInlining = ClipInlining; 2608 Arguments::_BackgroundCompilation = BackgroundCompilation; 2609 if (TieredCompilation) { 2610 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2611 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2612 } 2613 2614 // Setup flags for mixed which is the default 2615 set_mode_flags(_mixed); 2616 2617 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2618 // variable (if present). 2619 jint result = parse_each_vm_init_arg( 2620 java_tool_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR); 2621 if (result != JNI_OK) { 2622 return result; 2623 } 2624 2625 // Parse args structure generated from the command line flags. 2626 result = parse_each_vm_init_arg(cmd_line_args, &scp, &scp_assembly_required, 2627 Flag::COMMAND_LINE); 2628 if (result != JNI_OK) { 2629 return result; 2630 } 2631 2632 // Parse args structure generated from the _JAVA_OPTIONS environment 2633 // variable (if present) (mimics classic VM) 2634 result = parse_each_vm_init_arg( 2635 java_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR); 2636 if (result != JNI_OK) { 2637 return result; 2638 } 2639 2640 // Do final processing now that all arguments have been parsed 2641 result = finalize_vm_init_args(&scp, scp_assembly_required); 2642 if (result != JNI_OK) { 2643 return result; 2644 } 2645 2646 return JNI_OK; 2647} 2648 2649// Checks if name in command-line argument -agent{lib,path}:name[=options] 2650// represents a valid JDWP agent. is_path==true denotes that we 2651// are dealing with -agentpath (case where name is a path), otherwise with 2652// -agentlib 2653bool valid_jdwp_agent(char *name, bool is_path) { 2654 char *_name; 2655 const char *_jdwp = "jdwp"; 2656 size_t _len_jdwp, _len_prefix; 2657 2658 if (is_path) { 2659 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2660 return false; 2661 } 2662 2663 _name++; // skip past last path separator 2664 _len_prefix = strlen(JNI_LIB_PREFIX); 2665 2666 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2667 return false; 2668 } 2669 2670 _name += _len_prefix; 2671 _len_jdwp = strlen(_jdwp); 2672 2673 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2674 _name += _len_jdwp; 2675 } 2676 else { 2677 return false; 2678 } 2679 2680 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2681 return false; 2682 } 2683 2684 return true; 2685 } 2686 2687 if (strcmp(name, _jdwp) == 0) { 2688 return true; 2689 } 2690 2691 return false; 2692} 2693 2694jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2695 SysClassPath* scp_p, 2696 bool* scp_assembly_required_p, 2697 Flag::Flags origin) { 2698 // Remaining part of option string 2699 const char* tail; 2700 2701 // iterate over arguments 2702 for (int index = 0; index < args->nOptions; index++) { 2703 bool is_absolute_path = false; // for -agentpath vs -agentlib 2704 2705 const JavaVMOption* option = args->options + index; 2706 2707 if (!match_option(option, "-Djava.class.path", &tail) && 2708 !match_option(option, "-Dsun.java.command", &tail) && 2709 !match_option(option, "-Dsun.java.launcher", &tail)) { 2710 2711 // add all jvm options to the jvm_args string. This string 2712 // is used later to set the java.vm.args PerfData string constant. 2713 // the -Djava.class.path and the -Dsun.java.command options are 2714 // omitted from jvm_args string as each have their own PerfData 2715 // string constant object. 2716 build_jvm_args(option->optionString); 2717 } 2718 2719 // -verbose:[class/gc/jni] 2720 if (match_option(option, "-verbose", &tail)) { 2721 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2722 if (FLAG_SET_CMDLINE(bool, TraceClassLoading, true) != Flag::SUCCESS) { 2723 return JNI_EINVAL; 2724 } 2725 if (FLAG_SET_CMDLINE(bool, TraceClassUnloading, true) != Flag::SUCCESS) { 2726 return JNI_EINVAL; 2727 } 2728 } else if (!strcmp(tail, ":gc")) { 2729 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) { 2730 return JNI_EINVAL; 2731 } 2732 } else if (!strcmp(tail, ":jni")) { 2733 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) { 2734 return JNI_EINVAL; 2735 } 2736 } 2737 // -da / -ea / -disableassertions / -enableassertions 2738 // These accept an optional class/package name separated by a colon, e.g., 2739 // -da:java.lang.Thread. 2740 } else if (match_option(option, user_assertion_options, &tail, true)) { 2741 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2742 if (*tail == '\0') { 2743 JavaAssertions::setUserClassDefault(enable); 2744 } else { 2745 assert(*tail == ':', "bogus match by match_option()"); 2746 JavaAssertions::addOption(tail + 1, enable); 2747 } 2748 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2749 } else if (match_option(option, system_assertion_options, &tail, false)) { 2750 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2751 JavaAssertions::setSystemClassDefault(enable); 2752 // -bootclasspath: 2753 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2754 scp_p->reset_path(tail); 2755 *scp_assembly_required_p = true; 2756 // -bootclasspath/a: 2757 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2758 scp_p->add_suffix(tail); 2759 *scp_assembly_required_p = true; 2760 // -bootclasspath/p: 2761 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2762 scp_p->add_prefix(tail); 2763 *scp_assembly_required_p = true; 2764 // -Xrun 2765 } else if (match_option(option, "-Xrun", &tail)) { 2766 if (tail != NULL) { 2767 const char* pos = strchr(tail, ':'); 2768 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2769 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2770 name[len] = '\0'; 2771 2772 char *options = NULL; 2773 if(pos != NULL) { 2774 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2775 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2776 } 2777#if !INCLUDE_JVMTI 2778 if (strcmp(name, "jdwp") == 0) { 2779 jio_fprintf(defaultStream::error_stream(), 2780 "Debugging agents are not supported in this VM\n"); 2781 return JNI_ERR; 2782 } 2783#endif // !INCLUDE_JVMTI 2784 add_init_library(name, options); 2785 } 2786 // -agentlib and -agentpath 2787 } else if (match_option(option, "-agentlib:", &tail) || 2788 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2789 if(tail != NULL) { 2790 const char* pos = strchr(tail, '='); 2791 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2792 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2793 name[len] = '\0'; 2794 2795 char *options = NULL; 2796 if(pos != NULL) { 2797 options = os::strdup_check_oom(pos + 1, mtInternal); 2798 } 2799#if !INCLUDE_JVMTI 2800 if (valid_jdwp_agent(name, is_absolute_path)) { 2801 jio_fprintf(defaultStream::error_stream(), 2802 "Debugging agents are not supported in this VM\n"); 2803 return JNI_ERR; 2804 } 2805#endif // !INCLUDE_JVMTI 2806 add_init_agent(name, options, is_absolute_path); 2807 } 2808 // -javaagent 2809 } else if (match_option(option, "-javaagent:", &tail)) { 2810#if !INCLUDE_JVMTI 2811 jio_fprintf(defaultStream::error_stream(), 2812 "Instrumentation agents are not supported in this VM\n"); 2813 return JNI_ERR; 2814#else 2815 if(tail != NULL) { 2816 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2817 add_init_agent("instrument", options, false); 2818 } 2819#endif // !INCLUDE_JVMTI 2820 // -Xnoclassgc 2821 } else if (match_option(option, "-Xnoclassgc")) { 2822 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) { 2823 return JNI_EINVAL; 2824 } 2825 // -Xconcgc 2826 } else if (match_option(option, "-Xconcgc")) { 2827 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) { 2828 return JNI_EINVAL; 2829 } 2830 // -Xnoconcgc 2831 } else if (match_option(option, "-Xnoconcgc")) { 2832 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) { 2833 return JNI_EINVAL; 2834 } 2835 // -Xbatch 2836 } else if (match_option(option, "-Xbatch")) { 2837 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 2838 return JNI_EINVAL; 2839 } 2840 // -Xmn for compatibility with other JVM vendors 2841 } else if (match_option(option, "-Xmn", &tail)) { 2842 julong long_initial_young_size = 0; 2843 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2844 if (errcode != arg_in_range) { 2845 jio_fprintf(defaultStream::error_stream(), 2846 "Invalid initial young generation size: %s\n", option->optionString); 2847 describe_range_error(errcode); 2848 return JNI_EINVAL; 2849 } 2850 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2851 return JNI_EINVAL; 2852 } 2853 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2854 return JNI_EINVAL; 2855 } 2856 // -Xms 2857 } else if (match_option(option, "-Xms", &tail)) { 2858 julong long_initial_heap_size = 0; 2859 // an initial heap size of 0 means automatically determine 2860 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2861 if (errcode != arg_in_range) { 2862 jio_fprintf(defaultStream::error_stream(), 2863 "Invalid initial heap size: %s\n", option->optionString); 2864 describe_range_error(errcode); 2865 return JNI_EINVAL; 2866 } 2867 set_min_heap_size((size_t)long_initial_heap_size); 2868 // Currently the minimum size and the initial heap sizes are the same. 2869 // Can be overridden with -XX:InitialHeapSize. 2870 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) { 2871 return JNI_EINVAL; 2872 } 2873 // -Xmx 2874 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2875 julong long_max_heap_size = 0; 2876 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2877 if (errcode != arg_in_range) { 2878 jio_fprintf(defaultStream::error_stream(), 2879 "Invalid maximum heap size: %s\n", option->optionString); 2880 describe_range_error(errcode); 2881 return JNI_EINVAL; 2882 } 2883 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) { 2884 return JNI_EINVAL; 2885 } 2886 // Xmaxf 2887 } else if (match_option(option, "-Xmaxf", &tail)) { 2888 char* err; 2889 int maxf = (int)(strtod(tail, &err) * 100); 2890 if (*err != '\0' || *tail == '\0') { 2891 jio_fprintf(defaultStream::error_stream(), 2892 "Bad max heap free percentage size: %s\n", 2893 option->optionString); 2894 return JNI_EINVAL; 2895 } else { 2896 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) { 2897 return JNI_EINVAL; 2898 } 2899 } 2900 // Xminf 2901 } else if (match_option(option, "-Xminf", &tail)) { 2902 char* err; 2903 int minf = (int)(strtod(tail, &err) * 100); 2904 if (*err != '\0' || *tail == '\0') { 2905 jio_fprintf(defaultStream::error_stream(), 2906 "Bad min heap free percentage size: %s\n", 2907 option->optionString); 2908 return JNI_EINVAL; 2909 } else { 2910 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) { 2911 return JNI_EINVAL; 2912 } 2913 } 2914 // -Xss 2915 } else if (match_option(option, "-Xss", &tail)) { 2916 julong long_ThreadStackSize = 0; 2917 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2918 if (errcode != arg_in_range) { 2919 jio_fprintf(defaultStream::error_stream(), 2920 "Invalid thread stack size: %s\n", option->optionString); 2921 describe_range_error(errcode); 2922 return JNI_EINVAL; 2923 } 2924 // Internally track ThreadStackSize in units of 1024 bytes. 2925 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, 2926 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) { 2927 return JNI_EINVAL; 2928 } 2929 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs 2930 } else if (match_option(option, "-Xoss", &tail) || 2931 match_option(option, "-Xsqnopause") || 2932 match_option(option, "-Xoptimize") || 2933 match_option(option, "-Xboundthreads") || 2934 match_option(option, "-Xusealtsigs")) { 2935 // All these options are deprecated in JDK 9 and will be removed in a future release 2936 char version[256]; 2937 JDK_Version::jdk(9).to_string(version, sizeof(version)); 2938 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2939 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2940 julong long_CodeCacheExpansionSize = 0; 2941 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2942 if (errcode != arg_in_range) { 2943 jio_fprintf(defaultStream::error_stream(), 2944 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2945 os::vm_page_size()/K); 2946 return JNI_EINVAL; 2947 } 2948 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) { 2949 return JNI_EINVAL; 2950 } 2951 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2952 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2953 julong long_ReservedCodeCacheSize = 0; 2954 2955 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2956 if (errcode != arg_in_range) { 2957 jio_fprintf(defaultStream::error_stream(), 2958 "Invalid maximum code cache size: %s.\n", option->optionString); 2959 return JNI_EINVAL; 2960 } 2961 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) { 2962 return JNI_EINVAL; 2963 } 2964 // -XX:NonNMethodCodeHeapSize= 2965 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 2966 julong long_NonNMethodCodeHeapSize = 0; 2967 2968 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 2969 if (errcode != arg_in_range) { 2970 jio_fprintf(defaultStream::error_stream(), 2971 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 2972 return JNI_EINVAL; 2973 } 2974 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) { 2975 return JNI_EINVAL; 2976 } 2977 // -XX:ProfiledCodeHeapSize= 2978 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 2979 julong long_ProfiledCodeHeapSize = 0; 2980 2981 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 2982 if (errcode != arg_in_range) { 2983 jio_fprintf(defaultStream::error_stream(), 2984 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 2985 return JNI_EINVAL; 2986 } 2987 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) { 2988 return JNI_EINVAL; 2989 } 2990 // -XX:NonProfiledCodeHeapSizee= 2991 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 2992 julong long_NonProfiledCodeHeapSize = 0; 2993 2994 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 2995 if (errcode != arg_in_range) { 2996 jio_fprintf(defaultStream::error_stream(), 2997 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 2998 return JNI_EINVAL; 2999 } 3000 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) { 3001 return JNI_EINVAL; 3002 } 3003 // -green 3004 } else if (match_option(option, "-green")) { 3005 jio_fprintf(defaultStream::error_stream(), 3006 "Green threads support not available\n"); 3007 return JNI_EINVAL; 3008 // -native 3009 } else if (match_option(option, "-native")) { 3010 // HotSpot always uses native threads, ignore silently for compatibility 3011 // -Xrs 3012 } else if (match_option(option, "-Xrs")) { 3013 // Classic/EVM option, new functionality 3014 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) { 3015 return JNI_EINVAL; 3016 } 3017 // -Xprof 3018 } else if (match_option(option, "-Xprof")) { 3019#if INCLUDE_FPROF 3020 _has_profile = true; 3021#else // INCLUDE_FPROF 3022 jio_fprintf(defaultStream::error_stream(), 3023 "Flat profiling is not supported in this VM.\n"); 3024 return JNI_ERR; 3025#endif // INCLUDE_FPROF 3026 // -Xconcurrentio 3027 } else if (match_option(option, "-Xconcurrentio")) { 3028 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) { 3029 return JNI_EINVAL; 3030 } 3031 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 3032 return JNI_EINVAL; 3033 } 3034 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) { 3035 return JNI_EINVAL; 3036 } 3037 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) { 3038 return JNI_EINVAL; 3039 } 3040 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation 3041 return JNI_EINVAL; 3042 } 3043 3044 // -Xinternalversion 3045 } else if (match_option(option, "-Xinternalversion")) { 3046 jio_fprintf(defaultStream::output_stream(), "%s\n", 3047 VM_Version::internal_vm_info_string()); 3048 vm_exit(0); 3049#ifndef PRODUCT 3050 // -Xprintflags 3051 } else if (match_option(option, "-Xprintflags")) { 3052 CommandLineFlags::printFlags(tty, false); 3053 vm_exit(0); 3054#endif 3055 // -D 3056 } else if (match_option(option, "-D", &tail)) { 3057 const char* value; 3058 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 3059 *value!= '\0' && strcmp(value, "\"\"") != 0) { 3060 // abort if -Djava.endorsed.dirs is set 3061 jio_fprintf(defaultStream::output_stream(), 3062 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 3063 "in modular form will be supported via the concept of upgradeable modules.\n", value); 3064 return JNI_EINVAL; 3065 } 3066 if (match_option(option, "-Djava.ext.dirs=", &value) && 3067 *value != '\0' && strcmp(value, "\"\"") != 0) { 3068 // abort if -Djava.ext.dirs is set 3069 jio_fprintf(defaultStream::output_stream(), 3070 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 3071 return JNI_EINVAL; 3072 } 3073 3074 if (!add_property(tail)) { 3075 return JNI_ENOMEM; 3076 } 3077 // Out of the box management support 3078 if (match_option(option, "-Dcom.sun.management", &tail)) { 3079#if INCLUDE_MANAGEMENT 3080 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) { 3081 return JNI_EINVAL; 3082 } 3083#else 3084 jio_fprintf(defaultStream::output_stream(), 3085 "-Dcom.sun.management is not supported in this VM.\n"); 3086 return JNI_ERR; 3087#endif 3088 } 3089 // -Xint 3090 } else if (match_option(option, "-Xint")) { 3091 set_mode_flags(_int); 3092 // -Xmixed 3093 } else if (match_option(option, "-Xmixed")) { 3094 set_mode_flags(_mixed); 3095 // -Xcomp 3096 } else if (match_option(option, "-Xcomp")) { 3097 // for testing the compiler; turn off all flags that inhibit compilation 3098 set_mode_flags(_comp); 3099 // -Xshare:dump 3100 } else if (match_option(option, "-Xshare:dump")) { 3101 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) { 3102 return JNI_EINVAL; 3103 } 3104 set_mode_flags(_int); // Prevent compilation, which creates objects 3105 // -Xshare:on 3106 } else if (match_option(option, "-Xshare:on")) { 3107 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3108 return JNI_EINVAL; 3109 } 3110 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3111 return JNI_EINVAL; 3112 } 3113 // -Xshare:auto 3114 } else if (match_option(option, "-Xshare:auto")) { 3115 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3116 return JNI_EINVAL; 3117 } 3118 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3119 return JNI_EINVAL; 3120 } 3121 // -Xshare:off 3122 } else if (match_option(option, "-Xshare:off")) { 3123 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) { 3124 return JNI_EINVAL; 3125 } 3126 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3127 return JNI_EINVAL; 3128 } 3129 // -Xverify 3130 } else if (match_option(option, "-Xverify", &tail)) { 3131 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3132 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) { 3133 return JNI_EINVAL; 3134 } 3135 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3136 return JNI_EINVAL; 3137 } 3138 } else if (strcmp(tail, ":remote") == 0) { 3139 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3140 return JNI_EINVAL; 3141 } 3142 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3143 return JNI_EINVAL; 3144 } 3145 } else if (strcmp(tail, ":none") == 0) { 3146 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3147 return JNI_EINVAL; 3148 } 3149 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) { 3150 return JNI_EINVAL; 3151 } 3152 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3153 return JNI_EINVAL; 3154 } 3155 // -Xdebug 3156 } else if (match_option(option, "-Xdebug")) { 3157 // note this flag has been used, then ignore 3158 set_xdebug_mode(true); 3159 // -Xnoagent 3160 } else if (match_option(option, "-Xnoagent")) { 3161 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3162 } else if (match_option(option, "-Xloggc:", &tail)) { 3163 // Redirect GC output to the file. -Xloggc:<filename> 3164 // ostream_init_log(), when called will use this filename 3165 // to initialize a fileStream. 3166 _gc_log_filename = os::strdup_check_oom(tail); 3167 if (!is_filename_valid(_gc_log_filename)) { 3168 jio_fprintf(defaultStream::output_stream(), 3169 "Invalid file name for use with -Xloggc: Filename can only contain the " 3170 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 3171 "Note %%p or %%t can only be used once\n", _gc_log_filename); 3172 return JNI_EINVAL; 3173 } 3174 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) { 3175 return JNI_EINVAL; 3176 } 3177 if (FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true) != Flag::SUCCESS) { 3178 return JNI_EINVAL; 3179 } 3180 } else if (match_option(option, "-Xlog", &tail)) { 3181 bool ret = false; 3182 if (strcmp(tail, ":help") == 0) { 3183 LogConfiguration::print_command_line_help(defaultStream::output_stream()); 3184 vm_exit(0); 3185 } else if (strcmp(tail, ":disable") == 0) { 3186 LogConfiguration::disable_logging(); 3187 ret = true; 3188 } else if (*tail == '\0') { 3189 ret = LogConfiguration::parse_command_line_arguments(); 3190 assert(ret, "-Xlog without arguments should never fail to parse"); 3191 } else if (*tail == ':') { 3192 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 3193 } 3194 if (ret == false) { 3195 jio_fprintf(defaultStream::error_stream(), 3196 "Invalid -Xlog option '-Xlog%s'\n", 3197 tail); 3198 return JNI_EINVAL; 3199 } 3200 // JNI hooks 3201 } else if (match_option(option, "-Xcheck", &tail)) { 3202 if (!strcmp(tail, ":jni")) { 3203#if !INCLUDE_JNI_CHECK 3204 warning("JNI CHECKING is not supported in this VM"); 3205#else 3206 CheckJNICalls = true; 3207#endif // INCLUDE_JNI_CHECK 3208 } else if (is_bad_option(option, args->ignoreUnrecognized, 3209 "check")) { 3210 return JNI_EINVAL; 3211 } 3212 } else if (match_option(option, "vfprintf")) { 3213 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3214 } else if (match_option(option, "exit")) { 3215 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3216 } else if (match_option(option, "abort")) { 3217 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3218 // -XX:+AggressiveHeap 3219 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3220 jint result = set_aggressive_heap_flags(); 3221 if (result != JNI_OK) { 3222 return result; 3223 } 3224 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3225 // and the last option wins. 3226 } else if (match_option(option, "-XX:+NeverTenure")) { 3227 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) { 3228 return JNI_EINVAL; 3229 } 3230 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3231 return JNI_EINVAL; 3232 } 3233 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) { 3234 return JNI_EINVAL; 3235 } 3236 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3237 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3238 return JNI_EINVAL; 3239 } 3240 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3241 return JNI_EINVAL; 3242 } 3243 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) { 3244 return JNI_EINVAL; 3245 } 3246 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3247 uintx max_tenuring_thresh = 0; 3248 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3249 jio_fprintf(defaultStream::error_stream(), 3250 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 3251 return JNI_EINVAL; 3252 } 3253 3254 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) { 3255 return JNI_EINVAL; 3256 } 3257 3258 if (MaxTenuringThreshold == 0) { 3259 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3260 return JNI_EINVAL; 3261 } 3262 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3263 return JNI_EINVAL; 3264 } 3265 } else { 3266 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3267 return JNI_EINVAL; 3268 } 3269 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3270 return JNI_EINVAL; 3271 } 3272 } 3273 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3274 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) { 3275 return JNI_EINVAL; 3276 } 3277 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) { 3278 return JNI_EINVAL; 3279 } 3280 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3281 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) { 3282 return JNI_EINVAL; 3283 } 3284 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) { 3285 return JNI_EINVAL; 3286 } 3287 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3288#if defined(DTRACE_ENABLED) 3289 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) { 3290 return JNI_EINVAL; 3291 } 3292 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) { 3293 return JNI_EINVAL; 3294 } 3295 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) { 3296 return JNI_EINVAL; 3297 } 3298 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) { 3299 return JNI_EINVAL; 3300 } 3301#else // defined(DTRACE_ENABLED) 3302 jio_fprintf(defaultStream::error_stream(), 3303 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3304 return JNI_EINVAL; 3305#endif // defined(DTRACE_ENABLED) 3306#ifdef ASSERT 3307 } else if (match_option(option, "-XX:+FullGCALot")) { 3308 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) { 3309 return JNI_EINVAL; 3310 } 3311 // disable scavenge before parallel mark-compact 3312 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 3313 return JNI_EINVAL; 3314 } 3315#endif 3316#if !INCLUDE_MANAGEMENT 3317 } else if (match_option(option, "-XX:+ManagementServer")) { 3318 jio_fprintf(defaultStream::error_stream(), 3319 "ManagementServer is not supported in this VM.\n"); 3320 return JNI_ERR; 3321#endif // INCLUDE_MANAGEMENT 3322 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3323 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 3324 // already been handled 3325 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 3326 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 3327 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3328 return JNI_EINVAL; 3329 } 3330 } 3331 // Unknown option 3332 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3333 return JNI_ERR; 3334 } 3335 } 3336 3337 // PrintSharedArchiveAndExit will turn on 3338 // -Xshare:on 3339 // -XX:+TraceClassPaths 3340 if (PrintSharedArchiveAndExit) { 3341 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3342 return JNI_EINVAL; 3343 } 3344 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3345 return JNI_EINVAL; 3346 } 3347 if (FLAG_SET_CMDLINE(bool, TraceClassPaths, true) != Flag::SUCCESS) { 3348 return JNI_EINVAL; 3349 } 3350 } 3351 3352 // Change the default value for flags which have different default values 3353 // when working with older JDKs. 3354#ifdef LINUX 3355 if (JDK_Version::current().compare_major(6) <= 0 && 3356 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3357 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3358 } 3359#endif // LINUX 3360 fix_appclasspath(); 3361 return JNI_OK; 3362} 3363 3364// Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3365// 3366// This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3367// in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3368// Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3369// path is treated as the current directory. 3370// 3371// This causes problems with CDS, which requires that all directories specified in the classpath 3372// must be empty. In most cases, applications do NOT want to load classes from the current 3373// directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3374// scripts compatible with CDS. 3375void Arguments::fix_appclasspath() { 3376 if (IgnoreEmptyClassPaths) { 3377 const char separator = *os::path_separator(); 3378 const char* src = _java_class_path->value(); 3379 3380 // skip over all the leading empty paths 3381 while (*src == separator) { 3382 src ++; 3383 } 3384 3385 char* copy = os::strdup_check_oom(src, mtInternal); 3386 3387 // trim all trailing empty paths 3388 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3389 *tail = '\0'; 3390 } 3391 3392 char from[3] = {separator, separator, '\0'}; 3393 char to [2] = {separator, '\0'}; 3394 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3395 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3396 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3397 } 3398 3399 _java_class_path->set_value(copy); 3400 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3401 } 3402 3403 if (!PrintSharedArchiveAndExit) { 3404 ClassLoader::trace_class_path(tty, "[classpath: ", _java_class_path->value()); 3405 } 3406} 3407 3408static bool has_jar_files(const char* directory) { 3409 DIR* dir = os::opendir(directory); 3410 if (dir == NULL) return false; 3411 3412 struct dirent *entry; 3413 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 3414 bool hasJarFile = false; 3415 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3416 const char* name = entry->d_name; 3417 const char* ext = name + strlen(name) - 4; 3418 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3419 } 3420 FREE_C_HEAP_ARRAY(char, dbuf); 3421 os::closedir(dir); 3422 return hasJarFile ; 3423} 3424 3425static int check_non_empty_dirs(const char* path) { 3426 const char separator = *os::path_separator(); 3427 const char* const end = path + strlen(path); 3428 int nonEmptyDirs = 0; 3429 while (path < end) { 3430 const char* tmp_end = strchr(path, separator); 3431 if (tmp_end == NULL) { 3432 if (has_jar_files(path)) { 3433 nonEmptyDirs++; 3434 jio_fprintf(defaultStream::output_stream(), 3435 "Non-empty directory: %s\n", path); 3436 } 3437 path = end; 3438 } else { 3439 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 3440 memcpy(dirpath, path, tmp_end - path); 3441 dirpath[tmp_end - path] = '\0'; 3442 if (has_jar_files(dirpath)) { 3443 nonEmptyDirs++; 3444 jio_fprintf(defaultStream::output_stream(), 3445 "Non-empty directory: %s\n", dirpath); 3446 } 3447 FREE_C_HEAP_ARRAY(char, dirpath); 3448 path = tmp_end + 1; 3449 } 3450 } 3451 return nonEmptyDirs; 3452} 3453 3454jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3455 // check if the default lib/endorsed directory exists; if so, error 3456 char path[JVM_MAXPATHLEN]; 3457 const char* fileSep = os::file_separator(); 3458 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3459 3460#if INCLUDE_JVMCI 3461 if (EnableJVMCI) { 3462 JVMCIRuntime::save_options(_system_properties); 3463 } 3464#endif // INCLUDE_JVMCI 3465 3466 if (CheckEndorsedAndExtDirs) { 3467 int nonEmptyDirs = 0; 3468 // check endorsed directory 3469 nonEmptyDirs += check_non_empty_dirs(path); 3470 // check the extension directories 3471 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3472 if (nonEmptyDirs > 0) { 3473 return JNI_ERR; 3474 } 3475 } 3476 3477 DIR* dir = os::opendir(path); 3478 if (dir != NULL) { 3479 jio_fprintf(defaultStream::output_stream(), 3480 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3481 "in modular form will be supported via the concept of upgradeable modules.\n"); 3482 os::closedir(dir); 3483 return JNI_ERR; 3484 } 3485 3486 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3487 dir = os::opendir(path); 3488 if (dir != NULL) { 3489 jio_fprintf(defaultStream::output_stream(), 3490 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3491 "Use -classpath instead.\n."); 3492 os::closedir(dir); 3493 return JNI_ERR; 3494 } 3495 3496 if (scp_assembly_required) { 3497 // Assemble the bootclasspath elements into the final path. 3498 char *combined_path = scp_p->combined_path(); 3499 Arguments::set_sysclasspath(combined_path); 3500 FREE_C_HEAP_ARRAY(char, combined_path); 3501 } 3502 3503 // This must be done after all arguments have been processed. 3504 // java_compiler() true means set to "NONE" or empty. 3505 if (java_compiler() && !xdebug_mode()) { 3506 // For backwards compatibility, we switch to interpreted mode if 3507 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3508 // not specified. 3509 set_mode_flags(_int); 3510 } 3511 3512 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3513 // but like -Xint, leave compilation thresholds unaffected. 3514 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3515 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3516 set_mode_flags(_int); 3517 } 3518 3519 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3520 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3521 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3522 } 3523 3524#if !defined(COMPILER2) && !INCLUDE_JVMCI 3525 // Don't degrade server performance for footprint 3526 if (FLAG_IS_DEFAULT(UseLargePages) && 3527 MaxHeapSize < LargePageHeapSizeThreshold) { 3528 // No need for large granularity pages w/small heaps. 3529 // Note that large pages are enabled/disabled for both the 3530 // Java heap and the code cache. 3531 FLAG_SET_DEFAULT(UseLargePages, false); 3532 } 3533 3534#elif defined(COMPILER2) 3535 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3536 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3537 } 3538#endif 3539 3540#ifndef TIERED 3541 // Tiered compilation is undefined. 3542 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3543#endif 3544 3545 // If we are running in a headless jre, force java.awt.headless property 3546 // to be true unless the property has already been set. 3547 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3548 if (os::is_headless_jre()) { 3549 const char* headless = Arguments::get_property("java.awt.headless"); 3550 if (headless == NULL) { 3551 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3552 if (headless_env == NULL) { 3553 if (!add_property("java.awt.headless=true")) { 3554 return JNI_ENOMEM; 3555 } 3556 } else { 3557 char buffer[256]; 3558 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env); 3559 if (!add_property(buffer)) { 3560 return JNI_ENOMEM; 3561 } 3562 } 3563 } 3564 } 3565 3566 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) { 3567 // CMS can only be used with ParNew 3568 FLAG_SET_ERGO(bool, UseParNewGC, true); 3569 } 3570 3571 if (!check_vm_args_consistency()) { 3572 return JNI_ERR; 3573 } 3574 3575 return JNI_OK; 3576} 3577 3578// Helper class for controlling the lifetime of JavaVMInitArgs 3579// objects. The contents of the JavaVMInitArgs are guaranteed to be 3580// deleted on the destruction of the ScopedVMInitArgs object. 3581class ScopedVMInitArgs : public StackObj { 3582 private: 3583 JavaVMInitArgs _args; 3584 bool _is_set; 3585 3586 public: 3587 ScopedVMInitArgs() { 3588 _args.version = JNI_VERSION_1_2; 3589 _args.nOptions = 0; 3590 _args.options = NULL; 3591 _args.ignoreUnrecognized = false; 3592 _is_set = false; 3593 } 3594 3595 // Populates the JavaVMInitArgs object represented by this 3596 // ScopedVMInitArgs object with the arguments in options. The 3597 // allocated memory is deleted by the destructor. If this method 3598 // returns anything other than JNI_OK, then this object is in a 3599 // partially constructed state, and should be abandoned. 3600 jint set_args(GrowableArray<JavaVMOption>* options) { 3601 _is_set = true; 3602 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3603 JavaVMOption, options->length(), mtInternal); 3604 if (options_arr == NULL) { 3605 return JNI_ENOMEM; 3606 } 3607 _args.options = options_arr; 3608 3609 for (int i = 0; i < options->length(); i++) { 3610 options_arr[i] = options->at(i); 3611 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3612 if (options_arr[i].optionString == NULL) { 3613 // Rely on the destructor to do cleanup. 3614 _args.nOptions = i; 3615 return JNI_ENOMEM; 3616 } 3617 } 3618 3619 _args.nOptions = options->length(); 3620 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3621 return JNI_OK; 3622 } 3623 3624 JavaVMInitArgs* get() { return &_args; } 3625 bool is_set() { return _is_set; } 3626 3627 ~ScopedVMInitArgs() { 3628 if (_args.options == NULL) return; 3629 for (int i = 0; i < _args.nOptions; i++) { 3630 os::free(_args.options[i].optionString); 3631 } 3632 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3633 } 3634 3635 // Insert options into this option list, to replace option at 3636 // vm_options_file_pos (-XX:VMOptionsFile) 3637 jint insert(const JavaVMInitArgs* args, 3638 const JavaVMInitArgs* args_to_insert, 3639 const int vm_options_file_pos) { 3640 assert(_args.options == NULL, "shouldn't be set yet"); 3641 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3642 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3643 3644 int length = args->nOptions + args_to_insert->nOptions - 1; 3645 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) 3646 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3647 for (int i = 0; i < args->nOptions; i++) { 3648 if (i == vm_options_file_pos) { 3649 // insert the new options starting at the same place as the 3650 // -XX:VMOptionsFile option 3651 for (int j = 0; j < args_to_insert->nOptions; j++) { 3652 options->push(args_to_insert->options[j]); 3653 } 3654 } else { 3655 options->push(args->options[i]); 3656 } 3657 } 3658 // make into options array 3659 jint result = set_args(options); 3660 delete options; 3661 return result; 3662 } 3663}; 3664 3665jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3666 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3667} 3668 3669jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3670 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3671} 3672 3673jint Arguments::parse_options_environment_variable(const char* name, 3674 ScopedVMInitArgs* vm_args) { 3675 char *buffer = ::getenv(name); 3676 3677 // Don't check this environment variable if user has special privileges 3678 // (e.g. unix su command). 3679 if (buffer == NULL || os::have_special_privileges()) { 3680 return JNI_OK; 3681 } 3682 3683 if ((buffer = os::strdup(buffer)) == NULL) { 3684 return JNI_ENOMEM; 3685 } 3686 3687 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3688 3689 os::free(buffer); 3690 return retcode; 3691} 3692 3693jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3694 // read file into buffer 3695 int fd = ::open(file_name, O_RDONLY); 3696 if (fd < 0) { 3697 jio_fprintf(defaultStream::error_stream(), 3698 "Could not open options file '%s'\n", 3699 file_name); 3700 return JNI_ERR; 3701 } 3702 3703 struct stat stbuf; 3704 int retcode = os::stat(file_name, &stbuf); 3705 if (retcode != 0) { 3706 jio_fprintf(defaultStream::error_stream(), 3707 "Could not stat options file '%s'\n", 3708 file_name); 3709 os::close(fd); 3710 return JNI_ERR; 3711 } 3712 3713 if (stbuf.st_size == 0) { 3714 // tell caller there is no option data and that is ok 3715 os::close(fd); 3716 return JNI_OK; 3717 } 3718 3719 // '+ 1' for NULL termination even with max bytes 3720 size_t bytes_alloc = stbuf.st_size + 1; 3721 3722 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtInternal); 3723 if (NULL == buf) { 3724 jio_fprintf(defaultStream::error_stream(), 3725 "Could not allocate read buffer for options file parse\n"); 3726 os::close(fd); 3727 return JNI_ENOMEM; 3728 } 3729 3730 memset(buf, 0, bytes_alloc); 3731 3732 // Fill buffer 3733 // Use ::read() instead of os::read because os::read() 3734 // might do a thread state transition 3735 // and it is too early for that here 3736 3737 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3738 os::close(fd); 3739 if (bytes_read < 0) { 3740 FREE_C_HEAP_ARRAY(char, buf); 3741 jio_fprintf(defaultStream::error_stream(), 3742 "Could not read options file '%s'\n", file_name); 3743 return JNI_ERR; 3744 } 3745 3746 if (bytes_read == 0) { 3747 // tell caller there is no option data and that is ok 3748 FREE_C_HEAP_ARRAY(char, buf); 3749 return JNI_OK; 3750 } 3751 3752 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3753 3754 FREE_C_HEAP_ARRAY(char, buf); 3755 return retcode; 3756} 3757 3758jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3759 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array 3760 3761 // some pointers to help with parsing 3762 char *buffer_end = buffer + buf_len; 3763 char *opt_hd = buffer; 3764 char *wrt = buffer; 3765 char *rd = buffer; 3766 3767 // parse all options 3768 while (rd < buffer_end) { 3769 // skip leading white space from the input string 3770 while (rd < buffer_end && isspace(*rd)) { 3771 rd++; 3772 } 3773 3774 if (rd >= buffer_end) { 3775 break; 3776 } 3777 3778 // Remember this is where we found the head of the token. 3779 opt_hd = wrt; 3780 3781 // Tokens are strings of non white space characters separated 3782 // by one or more white spaces. 3783 while (rd < buffer_end && !isspace(*rd)) { 3784 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3785 int quote = *rd; // matching quote to look for 3786 rd++; // don't copy open quote 3787 while (rd < buffer_end && *rd != quote) { 3788 // include everything (even spaces) 3789 // up until the close quote 3790 *wrt++ = *rd++; // copy to option string 3791 } 3792 3793 if (rd < buffer_end) { 3794 rd++; // don't copy close quote 3795 } else { 3796 // did not see closing quote 3797 jio_fprintf(defaultStream::error_stream(), 3798 "Unmatched quote in %s\n", name); 3799 delete options; 3800 return JNI_ERR; 3801 } 3802 } else { 3803 *wrt++ = *rd++; // copy to option string 3804 } 3805 } 3806 3807 // steal a white space character and set it to NULL 3808 *wrt++ = '\0'; 3809 // We now have a complete token 3810 3811 JavaVMOption option; 3812 option.optionString = opt_hd; 3813 option.extraInfo = NULL; 3814 3815 options->append(option); // Fill in option 3816 3817 rd++; // Advance to next character 3818 } 3819 3820 // Fill out JavaVMInitArgs structure. 3821 jint status = vm_args->set_args(options); 3822 3823 delete options; 3824 return status; 3825} 3826 3827void Arguments::set_shared_spaces_flags() { 3828 if (DumpSharedSpaces) { 3829 if (RequireSharedSpaces) { 3830 warning("Cannot dump shared archive while using shared archive"); 3831 } 3832 UseSharedSpaces = false; 3833#ifdef _LP64 3834 if (!UseCompressedOops || !UseCompressedClassPointers) { 3835 vm_exit_during_initialization( 3836 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3837 } 3838 } else { 3839 if (!UseCompressedOops || !UseCompressedClassPointers) { 3840 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3841 } 3842#endif 3843 } 3844} 3845 3846#if !INCLUDE_ALL_GCS 3847static void force_serial_gc() { 3848 FLAG_SET_DEFAULT(UseSerialGC, true); 3849 UNSUPPORTED_GC_OPTION(UseG1GC); 3850 UNSUPPORTED_GC_OPTION(UseParallelGC); 3851 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3852 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3853 UNSUPPORTED_GC_OPTION(UseParNewGC); 3854} 3855#endif // INCLUDE_ALL_GCS 3856 3857// Sharing support 3858// Construct the path to the archive 3859static char* get_shared_archive_path() { 3860 char *shared_archive_path; 3861 if (SharedArchiveFile == NULL) { 3862 char jvm_path[JVM_MAXPATHLEN]; 3863 os::jvm_path(jvm_path, sizeof(jvm_path)); 3864 char *end = strrchr(jvm_path, *os::file_separator()); 3865 if (end != NULL) *end = '\0'; 3866 size_t jvm_path_len = strlen(jvm_path); 3867 size_t file_sep_len = strlen(os::file_separator()); 3868 const size_t len = jvm_path_len + file_sep_len + 20; 3869 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal); 3870 if (shared_archive_path != NULL) { 3871 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 3872 jvm_path, os::file_separator()); 3873 } 3874 } else { 3875 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal); 3876 } 3877 return shared_archive_path; 3878} 3879 3880#ifndef PRODUCT 3881// Determine whether LogVMOutput should be implicitly turned on. 3882static bool use_vm_log() { 3883 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3884 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3885 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3886 PrintAssembly || TraceDeoptimization || TraceDependencies || 3887 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3888 return true; 3889 } 3890 3891#ifdef COMPILER1 3892 if (PrintC1Statistics) { 3893 return true; 3894 } 3895#endif // COMPILER1 3896 3897#ifdef COMPILER2 3898 if (PrintOptoAssembly || PrintOptoStatistics) { 3899 return true; 3900 } 3901#endif // COMPILER2 3902 3903 return false; 3904} 3905 3906#endif // PRODUCT 3907 3908jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3909 char** vm_options_file, 3910 const int vm_options_file_pos, 3911 ScopedVMInitArgs *vm_options_file_args, 3912 ScopedVMInitArgs* args_out) { 3913 jint code = parse_vm_options_file(*vm_options_file, vm_options_file_args); 3914 if (code != JNI_OK) { 3915 return code; 3916 } 3917 3918 if (vm_options_file_args->get()->nOptions < 1) { 3919 return JNI_OK; 3920 } 3921 3922 return args_out->insert(args, vm_options_file_args->get(), 3923 vm_options_file_pos); 3924} 3925 3926jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 3927 char ** vm_options_file, 3928 ScopedVMInitArgs* args_out) { 3929 // Remaining part of option string 3930 const char* tail; 3931 int vm_options_file_pos = -1; 3932 ScopedVMInitArgs vm_options_file_args; 3933 3934 for (int index = 0; index < args->nOptions; index++) { 3935 const JavaVMOption* option = args->options + index; 3936 if (ArgumentsExt::process_options(option)) { 3937 continue; 3938 } 3939 if (match_option(option, "-XX:Flags=", &tail)) { 3940 Arguments::set_jvm_flags_file(tail); 3941 continue; 3942 } 3943 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3944 if (vm_options_file != NULL) { 3945 // The caller accepts -XX:VMOptionsFile 3946 if (*vm_options_file != NULL) { 3947 jio_fprintf(defaultStream::error_stream(), 3948 "The VM Options file can only be specified once and " 3949 "only on the command line.\n"); 3950 return JNI_EINVAL; 3951 } 3952 3953 *vm_options_file = (char *) tail; 3954 vm_options_file_pos = index; // save position of -XX:VMOptionsFile 3955 // If there's a VMOptionsFile, parse that (also can set flags_file) 3956 jint code = insert_vm_options_file(args, vm_options_file, 3957 vm_options_file_pos, 3958 &vm_options_file_args, args_out); 3959 if (code != JNI_OK) { 3960 return code; 3961 } 3962 if (args_out->is_set()) { 3963 // The VMOptions file inserted some options so switch 'args' 3964 // to the new set of options, and continue processing which 3965 // preserves "last option wins" semantics. 3966 args = args_out->get(); 3967 // The first option from the VMOptionsFile replaces the 3968 // current option. So we back track to process the 3969 // replacement option. 3970 index--; 3971 } 3972 } else { 3973 jio_fprintf(defaultStream::error_stream(), 3974 "VM options file is only supported on the command line\n"); 3975 return JNI_EINVAL; 3976 } 3977 continue; 3978 } 3979 if (match_option(option, "-XX:+PrintVMOptions")) { 3980 PrintVMOptions = true; 3981 continue; 3982 } 3983 if (match_option(option, "-XX:-PrintVMOptions")) { 3984 PrintVMOptions = false; 3985 continue; 3986 } 3987 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3988 IgnoreUnrecognizedVMOptions = true; 3989 continue; 3990 } 3991 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3992 IgnoreUnrecognizedVMOptions = false; 3993 continue; 3994 } 3995 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3996 CommandLineFlags::printFlags(tty, false); 3997 vm_exit(0); 3998 } 3999 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 4000#if INCLUDE_NMT 4001 // The launcher did not setup nmt environment variable properly. 4002 if (!MemTracker::check_launcher_nmt_support(tail)) { 4003 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 4004 } 4005 4006 // Verify if nmt option is valid. 4007 if (MemTracker::verify_nmt_option()) { 4008 // Late initialization, still in single-threaded mode. 4009 if (MemTracker::tracking_level() >= NMT_summary) { 4010 MemTracker::init(); 4011 } 4012 } else { 4013 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 4014 } 4015 continue; 4016#else 4017 jio_fprintf(defaultStream::error_stream(), 4018 "Native Memory Tracking is not supported in this VM\n"); 4019 return JNI_ERR; 4020#endif 4021 } 4022 4023#ifndef PRODUCT 4024 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 4025 CommandLineFlags::printFlags(tty, true); 4026 vm_exit(0); 4027 } 4028#endif 4029 } 4030 return JNI_OK; 4031} 4032 4033static void print_options(const JavaVMInitArgs *args) { 4034 const char* tail; 4035 for (int index = 0; index < args->nOptions; index++) { 4036 const JavaVMOption *option = args->options + index; 4037 if (match_option(option, "-XX:", &tail)) { 4038 logOption(tail); 4039 } 4040 } 4041} 4042 4043// Parse entry point called from JNI_CreateJavaVM 4044 4045jint Arguments::parse(const JavaVMInitArgs* args) { 4046 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 4047 4048 // Initialize ranges and constraints 4049 CommandLineFlagRangeList::init(); 4050 CommandLineFlagConstraintList::init(); 4051 4052 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 4053 const char* hotspotrc = ".hotspotrc"; 4054 char* vm_options_file = NULL; 4055 bool settings_file_specified = false; 4056 bool needs_hotspotrc_warning = false; 4057 ScopedVMInitArgs java_tool_options_args; 4058 ScopedVMInitArgs java_options_args; 4059 ScopedVMInitArgs modified_cmd_line_args; 4060 4061 jint code = 4062 parse_java_tool_options_environment_variable(&java_tool_options_args); 4063 if (code != JNI_OK) { 4064 return code; 4065 } 4066 4067 code = parse_java_options_environment_variable(&java_options_args); 4068 if (code != JNI_OK) { 4069 return code; 4070 } 4071 4072 code = match_special_option_and_act(java_tool_options_args.get(), 4073 NULL, NULL); 4074 if (code != JNI_OK) { 4075 return code; 4076 } 4077 4078 code = match_special_option_and_act(args, &vm_options_file, 4079 &modified_cmd_line_args); 4080 if (code != JNI_OK) { 4081 return code; 4082 } 4083 4084 4085 // The command line arguments have been modified to include VMOptionsFile arguments. 4086 if (modified_cmd_line_args.is_set()) { 4087 args = modified_cmd_line_args.get(); 4088 } 4089 4090 code = match_special_option_and_act(java_options_args.get(), 4091 NULL, NULL); 4092 if (code != JNI_OK) { 4093 return code; 4094 } 4095 4096 const char * flags_file = Arguments::get_jvm_flags_file(); 4097 settings_file_specified = (flags_file != NULL); 4098 4099 if (IgnoreUnrecognizedVMOptions) { 4100 // uncast const to modify the flag args->ignoreUnrecognized 4101 *(jboolean*)(&args->ignoreUnrecognized) = true; 4102 java_tool_options_args.get()->ignoreUnrecognized = true; 4103 java_options_args.get()->ignoreUnrecognized = true; 4104 } 4105 4106 // Parse specified settings file 4107 if (settings_file_specified) { 4108 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 4109 return JNI_EINVAL; 4110 } 4111 } else { 4112#ifdef ASSERT 4113 // Parse default .hotspotrc settings file 4114 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 4115 return JNI_EINVAL; 4116 } 4117#else 4118 struct stat buf; 4119 if (os::stat(hotspotrc, &buf) == 0) { 4120 needs_hotspotrc_warning = true; 4121 } 4122#endif 4123 } 4124 4125 if (PrintVMOptions) { 4126 print_options(java_tool_options_args.get()); 4127 print_options(args); 4128 print_options(java_options_args.get()); 4129 } 4130 4131 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 4132 jint result = parse_vm_init_args(java_tool_options_args.get(), 4133 java_options_args.get(), 4134 args); // command line arguments 4135 4136 if (result != JNI_OK) { 4137 return result; 4138 } 4139 4140 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 4141 SharedArchivePath = get_shared_archive_path(); 4142 if (SharedArchivePath == NULL) { 4143 return JNI_ENOMEM; 4144 } 4145 4146 // Set up VerifySharedSpaces 4147 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 4148 VerifySharedSpaces = true; 4149 } 4150 4151 // Delay warning until here so that we've had a chance to process 4152 // the -XX:-PrintWarnings flag 4153 if (needs_hotspotrc_warning) { 4154 warning("%s file is present but has been ignored. " 4155 "Run with -XX:Flags=%s to load the file.", 4156 hotspotrc, hotspotrc); 4157 } 4158 4159#if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 4160 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 4161#endif 4162 4163 ArgumentsExt::report_unsupported_options(); 4164 4165#ifndef PRODUCT 4166 if (TraceBytecodesAt != 0) { 4167 TraceBytecodes = true; 4168 } 4169 if (CountCompiledCalls) { 4170 if (UseCounterDecay) { 4171 warning("UseCounterDecay disabled because CountCalls is set"); 4172 UseCounterDecay = false; 4173 } 4174 } 4175#endif // PRODUCT 4176 4177 if (ScavengeRootsInCode == 0) { 4178 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4179 warning("Forcing ScavengeRootsInCode non-zero"); 4180 } 4181 ScavengeRootsInCode = 1; 4182 } 4183 4184 if (PrintGCDetails) { 4185 // Turn on -verbose:gc options as well 4186 PrintGC = true; 4187 } 4188 4189 // Set object alignment values. 4190 set_object_alignment(); 4191 4192#if !INCLUDE_ALL_GCS 4193 force_serial_gc(); 4194#endif // INCLUDE_ALL_GCS 4195#if !INCLUDE_CDS 4196 if (DumpSharedSpaces || RequireSharedSpaces) { 4197 jio_fprintf(defaultStream::error_stream(), 4198 "Shared spaces are not supported in this VM\n"); 4199 return JNI_ERR; 4200 } 4201 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 4202 warning("Shared spaces are not supported in this VM"); 4203 FLAG_SET_DEFAULT(UseSharedSpaces, false); 4204 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 4205 } 4206 no_shared_spaces("CDS Disabled"); 4207#endif // INCLUDE_CDS 4208 4209 return JNI_OK; 4210} 4211 4212jint Arguments::apply_ergo() { 4213 4214 // Set flags based on ergonomics. 4215 set_ergonomics_flags(); 4216 4217 set_shared_spaces_flags(); 4218 4219 // Check the GC selections again. 4220 if (!check_gc_consistency()) { 4221 return JNI_EINVAL; 4222 } 4223 4224 if (TieredCompilation) { 4225 set_tiered_flags(); 4226 } else { 4227 int max_compilation_policy_choice = 1; 4228#ifdef COMPILER2 4229 max_compilation_policy_choice = 2; 4230#endif 4231 // Check if the policy is valid. 4232 if (CompilationPolicyChoice >= max_compilation_policy_choice) { 4233 vm_exit_during_initialization( 4234 "Incompatible compilation policy selected", NULL); 4235 } 4236 // Scale CompileThreshold 4237 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 4238 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 4239 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 4240 } 4241 } 4242 4243#ifdef COMPILER2 4244#ifndef PRODUCT 4245 if (PrintIdealGraphLevel > 0) { 4246 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 4247 } 4248#endif 4249#endif 4250 4251 // Set heap size based on available physical memory 4252 set_heap_size(); 4253 4254 ArgumentsExt::set_gc_specific_flags(); 4255 4256 // Initialize Metaspace flags and alignments 4257 Metaspace::ergo_initialize(); 4258 4259 // Set bytecode rewriting flags 4260 set_bytecode_flags(); 4261 4262 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 4263 jint code = set_aggressive_opts_flags(); 4264 if (code != JNI_OK) { 4265 return code; 4266 } 4267 4268 // Turn off biased locking for locking debug mode flags, 4269 // which are subtly different from each other but neither works with 4270 // biased locking 4271 if (UseHeavyMonitors 4272#ifdef COMPILER1 4273 || !UseFastLocking 4274#endif // COMPILER1 4275#if INCLUDE_JVMCI 4276 || !JVMCIUseFastLocking 4277#endif 4278 ) { 4279 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4280 // flag set to true on command line; warn the user that they 4281 // can't enable biased locking here 4282 warning("Biased Locking is not supported with locking debug flags" 4283 "; ignoring UseBiasedLocking flag." ); 4284 } 4285 UseBiasedLocking = false; 4286 } 4287 4288#ifdef ZERO 4289 // Clear flags not supported on zero. 4290 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4291 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4292 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4293 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4294#endif // CC_INTERP 4295 4296#ifdef COMPILER2 4297 if (!EliminateLocks) { 4298 EliminateNestedLocks = false; 4299 } 4300 if (!Inline) { 4301 IncrementalInline = false; 4302 } 4303#ifndef PRODUCT 4304 if (!IncrementalInline) { 4305 AlwaysIncrementalInline = false; 4306 } 4307#endif 4308 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 4309 // nothing to use the profiling, turn if off 4310 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 4311 } 4312#endif 4313 4314 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4315 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4316 DebugNonSafepoints = true; 4317 } 4318 4319 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4320 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4321 } 4322 4323#ifndef PRODUCT 4324 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4325 if (use_vm_log()) { 4326 LogVMOutput = true; 4327 } 4328 } 4329#endif // PRODUCT 4330 4331 if (PrintCommandLineFlags) { 4332 CommandLineFlags::printSetFlags(tty); 4333 } 4334 4335 // Apply CPU specific policy for the BiasedLocking 4336 if (UseBiasedLocking) { 4337 if (!VM_Version::use_biased_locking() && 4338 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4339 UseBiasedLocking = false; 4340 } 4341 } 4342#ifdef COMPILER2 4343 if (!UseBiasedLocking || EmitSync != 0) { 4344 UseOptoBiasInlining = false; 4345 } 4346#endif 4347 4348 return JNI_OK; 4349} 4350 4351jint Arguments::adjust_after_os() { 4352 if (UseNUMA) { 4353 if (UseParallelGC || UseParallelOldGC) { 4354 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4355 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4356 } 4357 } 4358 // UseNUMAInterleaving is set to ON for all collectors and 4359 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4360 // such as the parallel collector for Linux and Solaris will 4361 // interleave old gen and survivor spaces on top of NUMA 4362 // allocation policy for the eden space. 4363 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4364 // all platforms and ParallelGC on Windows will interleave all 4365 // of the heap spaces across NUMA nodes. 4366 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4367 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4368 } 4369 } 4370 return JNI_OK; 4371} 4372 4373int Arguments::PropertyList_count(SystemProperty* pl) { 4374 int count = 0; 4375 while(pl != NULL) { 4376 count++; 4377 pl = pl->next(); 4378 } 4379 return count; 4380} 4381 4382const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4383 assert(key != NULL, "just checking"); 4384 SystemProperty* prop; 4385 for (prop = pl; prop != NULL; prop = prop->next()) { 4386 if (strcmp(key, prop->key()) == 0) return prop->value(); 4387 } 4388 return NULL; 4389} 4390 4391const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4392 int count = 0; 4393 const char* ret_val = NULL; 4394 4395 while(pl != NULL) { 4396 if(count >= index) { 4397 ret_val = pl->key(); 4398 break; 4399 } 4400 count++; 4401 pl = pl->next(); 4402 } 4403 4404 return ret_val; 4405} 4406 4407char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4408 int count = 0; 4409 char* ret_val = NULL; 4410 4411 while(pl != NULL) { 4412 if(count >= index) { 4413 ret_val = pl->value(); 4414 break; 4415 } 4416 count++; 4417 pl = pl->next(); 4418 } 4419 4420 return ret_val; 4421} 4422 4423void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4424 SystemProperty* p = *plist; 4425 if (p == NULL) { 4426 *plist = new_p; 4427 } else { 4428 while (p->next() != NULL) { 4429 p = p->next(); 4430 } 4431 p->set_next(new_p); 4432 } 4433} 4434 4435void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v) { 4436 if (plist == NULL) 4437 return; 4438 4439 SystemProperty* new_p = new SystemProperty(k, v, true); 4440 PropertyList_add(plist, new_p); 4441} 4442 4443void Arguments::PropertyList_add(SystemProperty *element) { 4444 PropertyList_add(&_system_properties, element); 4445} 4446 4447// This add maintains unique property key in the list. 4448void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, jboolean append) { 4449 if (plist == NULL) 4450 return; 4451 4452 // If property key exist then update with new value. 4453 SystemProperty* prop; 4454 for (prop = *plist; prop != NULL; prop = prop->next()) { 4455 if (strcmp(k, prop->key()) == 0) { 4456 if (append) { 4457 prop->append_value(v); 4458 } else { 4459 prop->set_value(v); 4460 } 4461 return; 4462 } 4463 } 4464 4465 PropertyList_add(plist, k, v); 4466} 4467 4468// Copies src into buf, replacing "%%" with "%" and "%p" with pid 4469// Returns true if all of the source pointed by src has been copied over to 4470// the destination buffer pointed by buf. Otherwise, returns false. 4471// Notes: 4472// 1. If the length (buflen) of the destination buffer excluding the 4473// NULL terminator character is not long enough for holding the expanded 4474// pid characters, it also returns false instead of returning the partially 4475// expanded one. 4476// 2. The passed in "buflen" should be large enough to hold the null terminator. 4477bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4478 char* buf, size_t buflen) { 4479 const char* p = src; 4480 char* b = buf; 4481 const char* src_end = &src[srclen]; 4482 char* buf_end = &buf[buflen - 1]; 4483 4484 while (p < src_end && b < buf_end) { 4485 if (*p == '%') { 4486 switch (*(++p)) { 4487 case '%': // "%%" ==> "%" 4488 *b++ = *p++; 4489 break; 4490 case 'p': { // "%p" ==> current process id 4491 // buf_end points to the character before the last character so 4492 // that we could write '\0' to the end of the buffer. 4493 size_t buf_sz = buf_end - b + 1; 4494 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4495 4496 // if jio_snprintf fails or the buffer is not long enough to hold 4497 // the expanded pid, returns false. 4498 if (ret < 0 || ret >= (int)buf_sz) { 4499 return false; 4500 } else { 4501 b += ret; 4502 assert(*b == '\0', "fail in copy_expand_pid"); 4503 if (p == src_end && b == buf_end + 1) { 4504 // reach the end of the buffer. 4505 return true; 4506 } 4507 } 4508 p++; 4509 break; 4510 } 4511 default : 4512 *b++ = '%'; 4513 } 4514 } else { 4515 *b++ = *p++; 4516 } 4517 } 4518 *b = '\0'; 4519 return (p == src_end); // return false if not all of the source was copied 4520} 4521