1/* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "precompiled.hpp" 26#include "classfile/classLoader.hpp" 27#include "classfile/javaAssertions.hpp" 28#include "classfile/moduleEntry.hpp" 29#include "classfile/stringTable.hpp" 30#include "classfile/symbolTable.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/log.hpp" 36#include "logging/logConfiguration.hpp" 37#include "logging/logStream.hpp" 38#include "logging/logTag.hpp" 39#include "memory/allocation.inline.hpp" 40#include "memory/universe.inline.hpp" 41#include "oops/oop.inline.hpp" 42#include "prims/jvmtiExport.hpp" 43#include "runtime/arguments.hpp" 44#include "runtime/arguments_ext.hpp" 45#include "runtime/commandLineFlagConstraintList.hpp" 46#include "runtime/commandLineFlagWriteableList.hpp" 47#include "runtime/commandLineFlagRangeList.hpp" 48#include "runtime/globals.hpp" 49#include "runtime/globals_extension.hpp" 50#include "runtime/java.hpp" 51#include "runtime/os.hpp" 52#include "runtime/vm_version.hpp" 53#include "services/management.hpp" 54#include "services/memTracker.hpp" 55#include "utilities/defaultStream.hpp" 56#include "utilities/macros.hpp" 57#include "utilities/stringUtils.hpp" 58#if INCLUDE_JVMCI 59#include "jvmci/jvmciRuntime.hpp" 60#endif 61#if INCLUDE_ALL_GCS 62#include "gc/cms/compactibleFreeListSpace.hpp" 63#include "gc/g1/g1CollectedHeap.inline.hpp" 64#include "gc/parallel/parallelScavengeHeap.hpp" 65#endif // INCLUDE_ALL_GCS 66 67// Note: This is a special bug reporting site for the JVM 68#define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 69#define DEFAULT_JAVA_LAUNCHER "generic" 70 71char* Arguments::_jvm_flags_file = NULL; 72char** Arguments::_jvm_flags_array = NULL; 73int Arguments::_num_jvm_flags = 0; 74char** Arguments::_jvm_args_array = NULL; 75int Arguments::_num_jvm_args = 0; 76char* Arguments::_java_command = NULL; 77SystemProperty* Arguments::_system_properties = NULL; 78const char* Arguments::_gc_log_filename = NULL; 79bool Arguments::_has_profile = false; 80size_t Arguments::_conservative_max_heap_alignment = 0; 81size_t Arguments::_min_heap_size = 0; 82Arguments::Mode Arguments::_mode = _mixed; 83bool Arguments::_java_compiler = false; 84bool Arguments::_xdebug_mode = false; 85const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 86const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 87int Arguments::_sun_java_launcher_pid = -1; 88bool Arguments::_sun_java_launcher_is_altjvm = false; 89 90// These parameters are reset in method parse_vm_init_args() 91bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 92bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 93bool Arguments::_BackgroundCompilation = BackgroundCompilation; 94bool Arguments::_ClipInlining = ClipInlining; 95intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 96intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 97 98char* Arguments::SharedArchivePath = NULL; 99 100AgentLibraryList Arguments::_libraryList; 101AgentLibraryList Arguments::_agentList; 102 103abort_hook_t Arguments::_abort_hook = NULL; 104exit_hook_t Arguments::_exit_hook = NULL; 105vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 106 107 108SystemProperty *Arguments::_sun_boot_library_path = NULL; 109SystemProperty *Arguments::_java_library_path = NULL; 110SystemProperty *Arguments::_java_home = NULL; 111SystemProperty *Arguments::_java_class_path = NULL; 112SystemProperty *Arguments::_jdk_boot_class_path_append = NULL; 113 114GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL; 115PathString *Arguments::_system_boot_class_path = NULL; 116bool Arguments::_has_jimage = false; 117 118char* Arguments::_ext_dirs = NULL; 119 120// Check if head of 'option' matches 'name', and sets 'tail' to the remaining 121// part of the option string. 122static bool match_option(const JavaVMOption *option, const char* name, 123 const char** tail) { 124 size_t len = strlen(name); 125 if (strncmp(option->optionString, name, len) == 0) { 126 *tail = option->optionString + len; 127 return true; 128 } else { 129 return false; 130 } 131} 132 133// Check if 'option' matches 'name'. No "tail" is allowed. 134static bool match_option(const JavaVMOption *option, const char* name) { 135 const char* tail = NULL; 136 bool result = match_option(option, name, &tail); 137 if (tail != NULL && *tail == '\0') { 138 return result; 139 } else { 140 return false; 141 } 142} 143 144// Return true if any of the strings in null-terminated array 'names' matches. 145// If tail_allowed is true, then the tail must begin with a colon; otherwise, 146// the option must match exactly. 147static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 148 bool tail_allowed) { 149 for (/* empty */; *names != NULL; ++names) { 150 if (match_option(option, *names, tail)) { 151 if (**tail == '\0' || tail_allowed && **tail == ':') { 152 return true; 153 } 154 } 155 } 156 return false; 157} 158 159static void logOption(const char* opt) { 160 if (PrintVMOptions) { 161 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 162 } 163} 164 165bool needs_module_property_warning = false; 166 167#define MODULE_PROPERTY_PREFIX "jdk.module." 168#define MODULE_PROPERTY_PREFIX_LEN 11 169#define ADDEXPORTS "addexports" 170#define ADDEXPORTS_LEN 10 171#define ADDREADS "addreads" 172#define ADDREADS_LEN 8 173#define ADDOPENS "addopens" 174#define ADDOPENS_LEN 8 175#define PATCH "patch" 176#define PATCH_LEN 5 177#define ADDMODS "addmods" 178#define ADDMODS_LEN 7 179#define LIMITMODS "limitmods" 180#define LIMITMODS_LEN 9 181#define PATH "path" 182#define PATH_LEN 4 183#define UPGRADE_PATH "upgrade.path" 184#define UPGRADE_PATH_LEN 12 185 186// Return TRUE if option matches 'property', or 'property=', or 'property.'. 187static bool matches_property_suffix(const char* option, const char* property, size_t len) { 188 return ((strncmp(option, property, len) == 0) && 189 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 190} 191 192// Return true if property starts with "jdk.module." and its ensuing chars match 193// any of the reserved module properties. 194// property should be passed without the leading "-D". 195bool Arguments::is_internal_module_property(const char* property) { 196 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 197 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 198 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 199 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 200 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 201 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 202 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 203 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 204 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 205 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 206 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) { 207 return true; 208 } 209 } 210 return false; 211} 212 213// Process java launcher properties. 214void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 215 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 216 // sun.java.launcher.pid is defined. 217 // Must do this before setting up other system properties, 218 // as some of them may depend on launcher type. 219 for (int index = 0; index < args->nOptions; index++) { 220 const JavaVMOption* option = args->options + index; 221 const char* tail; 222 223 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 224 process_java_launcher_argument(tail, option->extraInfo); 225 continue; 226 } 227 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 228 if (strcmp(tail, "true") == 0) { 229 _sun_java_launcher_is_altjvm = true; 230 } 231 continue; 232 } 233 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 234 _sun_java_launcher_pid = atoi(tail); 235 continue; 236 } 237 } 238} 239 240// Initialize system properties key and value. 241void Arguments::init_system_properties() { 242 243 // Set up _system_boot_class_path which is not a property but 244 // relies heavily on argument processing and the jdk.boot.class.path.append 245 // property. It is used to store the underlying system boot class path. 246 _system_boot_class_path = new PathString(NULL); 247 248 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 249 "Java Virtual Machine Specification", false)); 250 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 251 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 252 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 253 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 254 255 // Following are JVMTI agent writable properties. 256 // Properties values are set to NULL and they are 257 // os specific they are initialized in os::init_system_properties_values(). 258 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 259 _java_library_path = new SystemProperty("java.library.path", NULL, true); 260 _java_home = new SystemProperty("java.home", NULL, true); 261 _java_class_path = new SystemProperty("java.class.path", "", true); 262 // jdk.boot.class.path.append is a non-writeable, internal property. 263 // It can only be set by either: 264 // - -Xbootclasspath/a: 265 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 266 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true); 267 268 // Add to System Property list. 269 PropertyList_add(&_system_properties, _sun_boot_library_path); 270 PropertyList_add(&_system_properties, _java_library_path); 271 PropertyList_add(&_system_properties, _java_home); 272 PropertyList_add(&_system_properties, _java_class_path); 273 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 274 275 // Set OS specific system properties values 276 os::init_system_properties_values(); 277} 278 279// Update/Initialize System properties after JDK version number is known 280void Arguments::init_version_specific_system_properties() { 281 enum { bufsz = 16 }; 282 char buffer[bufsz]; 283 const char* spec_vendor = "Oracle Corporation"; 284 uint32_t spec_version = JDK_Version::current().major_version(); 285 286 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 287 288 PropertyList_add(&_system_properties, 289 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 290 PropertyList_add(&_system_properties, 291 new SystemProperty("java.vm.specification.version", buffer, false)); 292 PropertyList_add(&_system_properties, 293 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 294} 295 296/* 297 * -XX argument processing: 298 * 299 * -XX arguments are defined in several places, such as: 300 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 301 * -XX arguments are parsed in parse_argument(). 302 * -XX argument bounds checking is done in check_vm_args_consistency(). 303 * 304 * Over time -XX arguments may change. There are mechanisms to handle common cases: 305 * 306 * ALIASED: An option that is simply another name for another option. This is often 307 * part of the process of deprecating a flag, but not all aliases need 308 * to be deprecated. 309 * 310 * Create an alias for an option by adding the old and new option names to the 311 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 312 * 313 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 314 * support may be removed in the future. Both regular and aliased options may be 315 * deprecated. 316 * 317 * Add a deprecation warning for an option (or alias) by adding an entry in the 318 * "special_jvm_flags" table and setting the "deprecated_in" field. 319 * Often an option "deprecated" in one major release will 320 * be made "obsolete" in the next. In this case the entry should also have it's 321 * "obsolete_in" field set. 322 * 323 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 324 * on the command line. A warning is printed to let the user know that option might not 325 * be accepted in the future. 326 * 327 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 328 * table and setting the "obsolete_in" field. 329 * 330 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 331 * to the current JDK version. The system will flatly refuse to admit the existence of 332 * the flag. This allows a flag to die automatically over JDK releases. 333 * 334 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 335 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 336 * - Newly obsolete or expired deprecated options should have their global variable 337 * definitions removed (from globals.hpp, etc) and related implementations removed. 338 * 339 * Recommended approach for removing options: 340 * 341 * To remove options commonly used by customers (e.g. product, commercial -XX options), use 342 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 343 * 344 * To remove internal options (e.g. diagnostic, experimental, develop options), use 345 * a 2-step model adding major release numbers to the obsolete and expire columns. 346 * 347 * To change the name of an option, use the alias table as well as a 2-step 348 * model adding major release numbers to the deprecate and expire columns. 349 * Think twice about aliasing commonly used customer options. 350 * 351 * There are times when it is appropriate to leave a future release number as undefined. 352 * 353 * Tests: Aliases should be tested in VMAliasOptions.java. 354 * Deprecated options should be tested in VMDeprecatedOptions.java. 355 */ 356 357// The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 358// "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 359// When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 360// the command-line as usual, but will issue a warning. 361// When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 362// the command-line, while issuing a warning and ignoring the flag value. 363// Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 364// existence of the flag. 365// 366// MANUAL CLEANUP ON JDK VERSION UPDATES: 367// This table ensures that the handling of options will update automatically when the JDK 368// version is incremented, but the source code needs to be cleanup up manually: 369// - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 370// variable should be removed, as well as users of the variable. 371// - As "deprecated" options age into "obsolete" options, move the entry into the 372// "Obsolete Flags" section of the table. 373// - All expired options should be removed from the table. 374static SpecialFlag const special_jvm_flags[] = { 375 // -------------- Deprecated Flags -------------- 376 // --- Non-alias flags - sorted by obsolete_in then expired_in: 377 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 378 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 379 { "AutoGCSelectPauseMillis", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 380 { "UseAutoGCSelectPolicy", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 381 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 382 { "ExplicitGCInvokesConcurrentAndUnloadsClasses", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 383 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 384 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 385 386 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 387 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 388 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 389 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 390 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 391 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 392 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 393 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 394 395 // -------------- Obsolete Flags - sorted by expired_in -------------- 396 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 397 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 398 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 399 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 400 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 401 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 402 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 403 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 404 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 405 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 406 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 407 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 408 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 409#ifndef ZERO 410 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 411 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 412#endif // ZERO 413 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 414 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 415 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 416 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 417 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 418 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 419 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 420 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 421 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 422 { "SegmentedHeapDumpThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 423 { "PrintOopAddress", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 424 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::jdk(10) }, 425 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::jdk(10) }, 426 427#ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 428 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 429 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 430 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 431 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 432 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 433 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 434 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() }, 435#endif 436 437 { NULL, JDK_Version(0), JDK_Version(0) } 438}; 439 440// Flags that are aliases for other flags. 441typedef struct { 442 const char* alias_name; 443 const char* real_name; 444} AliasedFlag; 445 446static AliasedFlag const aliased_jvm_flags[] = { 447 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 448 { "CMSMarkStackSizeMax", "MarkStackSizeMax" }, 449 { "CMSMarkStackSize", "MarkStackSize" }, 450 { "G1MarkStackSize", "MarkStackSize" }, 451 { "ParallelMarkingThreads", "ConcGCThreads" }, 452 { "ParallelCMSThreads", "ConcGCThreads" }, 453 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 454 { NULL, NULL} 455}; 456 457// NOTE: A compatibility request will be necessary for each alias to be removed. 458static AliasedLoggingFlag const aliased_logging_flags[] = { 459 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) }, 460 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) }, 461 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) }, 462 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) }, 463 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) }, 464 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) }, 465 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) }, 466 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) }, 467 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) }, 468 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) }, 469 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) }, 470 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) }, 471 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) }, 472 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) } 473}; 474 475#ifndef PRODUCT 476// These options are removed in jdk9. Remove this code for jdk10. 477static AliasedFlag const removed_develop_logging_flags[] = { 478 { "TraceClassInitialization", "-Xlog:class+init" }, 479 { "TraceClassLoaderData", "-Xlog:class+loader+data" }, 480 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" }, 481 { "TraceItables", "-Xlog:itables=debug" }, 482 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" }, 483 { "TraceSafepoint", "-Xlog:safepoint=debug" }, 484 { "TraceStartupTime", "-Xlog:startuptime" }, 485 { "TraceVMOperation", "-Xlog:vmoperation=debug" }, 486 { "PrintVtables", "-Xlog:vtables=debug" }, 487 { "VerboseVerification", "-Xlog:verification" }, 488 { NULL, NULL } 489}; 490#endif //PRODUCT 491 492// Return true if "v" is less than "other", where "other" may be "undefined". 493static bool version_less_than(JDK_Version v, JDK_Version other) { 494 assert(!v.is_undefined(), "must be defined"); 495 if (!other.is_undefined() && v.compare(other) >= 0) { 496 return false; 497 } else { 498 return true; 499 } 500} 501 502extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag); 503 504static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 505 // Allow extensions to have priority 506 if (lookup_special_flag_ext(flag_name, flag)) { 507 return true; 508 } 509 510 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 511 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 512 flag = special_jvm_flags[i]; 513 return true; 514 } 515 } 516 return false; 517} 518 519bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 520 assert(version != NULL, "Must provide a version buffer"); 521 SpecialFlag flag; 522 if (lookup_special_flag(flag_name, flag)) { 523 if (!flag.obsolete_in.is_undefined()) { 524 if (version_less_than(JDK_Version::current(), flag.expired_in)) { 525 *version = flag.obsolete_in; 526 return true; 527 } 528 } 529 } 530 return false; 531} 532 533int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 534 assert(version != NULL, "Must provide a version buffer"); 535 SpecialFlag flag; 536 if (lookup_special_flag(flag_name, flag)) { 537 if (!flag.deprecated_in.is_undefined()) { 538 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 539 version_less_than(JDK_Version::current(), flag.expired_in)) { 540 *version = flag.deprecated_in; 541 return 1; 542 } else { 543 return -1; 544 } 545 } 546 } 547 return 0; 548} 549 550#ifndef PRODUCT 551const char* Arguments::removed_develop_logging_flag_name(const char* name){ 552 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) { 553 const AliasedFlag& flag = removed_develop_logging_flags[i]; 554 if (strcmp(flag.alias_name, name) == 0) { 555 return flag.real_name; 556 } 557 } 558 return NULL; 559} 560#endif // PRODUCT 561 562const char* Arguments::real_flag_name(const char *flag_name) { 563 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 564 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 565 if (strcmp(flag_status.alias_name, flag_name) == 0) { 566 return flag_status.real_name; 567 } 568 } 569 return flag_name; 570} 571 572#ifdef ASSERT 573static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 574 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 575 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 576 return true; 577 } 578 } 579 return false; 580} 581 582static bool verify_special_jvm_flags() { 583 bool success = true; 584 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 585 const SpecialFlag& flag = special_jvm_flags[i]; 586 if (lookup_special_flag(flag.name, i)) { 587 warning("Duplicate special flag declaration \"%s\"", flag.name); 588 success = false; 589 } 590 if (flag.deprecated_in.is_undefined() && 591 flag.obsolete_in.is_undefined()) { 592 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 593 success = false; 594 } 595 596 if (!flag.deprecated_in.is_undefined()) { 597 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 598 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 599 success = false; 600 } 601 602 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 603 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 604 success = false; 605 } 606 } 607 608 if (!flag.obsolete_in.is_undefined()) { 609 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 610 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 611 success = false; 612 } 613 614 // if flag has become obsolete it should not have a "globals" flag defined anymore. 615 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 616 if (Flag::find_flag(flag.name) != NULL) { 617 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 618 success = false; 619 } 620 } 621 } 622 623 if (!flag.expired_in.is_undefined()) { 624 // if flag has become expired it should not have a "globals" flag defined anymore. 625 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 626 if (Flag::find_flag(flag.name) != NULL) { 627 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 628 success = false; 629 } 630 } 631 } 632 633 } 634 return success; 635} 636#endif 637 638// Parses a size specification string. 639bool Arguments::atojulong(const char *s, julong* result) { 640 julong n = 0; 641 642 // First char must be a digit. Don't allow negative numbers or leading spaces. 643 if (!isdigit(*s)) { 644 return false; 645 } 646 647 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')); 648 char* remainder; 649 errno = 0; 650 n = strtoull(s, &remainder, (is_hex ? 16 : 10)); 651 if (errno != 0) { 652 return false; 653 } 654 655 // Fail if no number was read at all or if the remainder contains more than a single non-digit character. 656 if (remainder == s || strlen(remainder) > 1) { 657 return false; 658 } 659 660 switch (*remainder) { 661 case 'T': case 't': 662 *result = n * G * K; 663 // Check for overflow. 664 if (*result/((julong)G * K) != n) return false; 665 return true; 666 case 'G': case 'g': 667 *result = n * G; 668 if (*result/G != n) return false; 669 return true; 670 case 'M': case 'm': 671 *result = n * M; 672 if (*result/M != n) return false; 673 return true; 674 case 'K': case 'k': 675 *result = n * K; 676 if (*result/K != n) return false; 677 return true; 678 case '\0': 679 *result = n; 680 return true; 681 default: 682 return false; 683 } 684} 685 686Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 687 if (size < min_size) return arg_too_small; 688 // Check that size will fit in a size_t (only relevant on 32-bit) 689 if (size > max_uintx) return arg_too_big; 690 return arg_in_range; 691} 692 693// Describe an argument out of range error 694void Arguments::describe_range_error(ArgsRange errcode) { 695 switch(errcode) { 696 case arg_too_big: 697 jio_fprintf(defaultStream::error_stream(), 698 "The specified size exceeds the maximum " 699 "representable size.\n"); 700 break; 701 case arg_too_small: 702 case arg_unreadable: 703 case arg_in_range: 704 // do nothing for now 705 break; 706 default: 707 ShouldNotReachHere(); 708 } 709} 710 711static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) { 712 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) { 713 return true; 714 } else { 715 return false; 716 } 717} 718 719static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) { 720 char* end; 721 errno = 0; 722 double v = strtod(value, &end); 723 if ((errno != 0) || (*end != 0)) { 724 return false; 725 } 726 727 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) { 728 return true; 729 } 730 return false; 731} 732 733static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) { 734 julong v; 735 int int_v; 736 intx intx_v; 737 bool is_neg = false; 738 Flag* result = Flag::find_flag(name, strlen(name)); 739 740 if (result == NULL) { 741 return false; 742 } 743 744 // Check the sign first since atojulong() parses only unsigned values. 745 if (*value == '-') { 746 if (!result->is_intx() && !result->is_int()) { 747 return false; 748 } 749 value++; 750 is_neg = true; 751 } 752 if (!Arguments::atojulong(value, &v)) { 753 return false; 754 } 755 if (result->is_int()) { 756 int_v = (int) v; 757 if (is_neg) { 758 int_v = -int_v; 759 } 760 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS; 761 } else if (result->is_uint()) { 762 uint uint_v = (uint) v; 763 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS; 764 } else if (result->is_intx()) { 765 intx_v = (intx) v; 766 if (is_neg) { 767 intx_v = -intx_v; 768 } 769 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS; 770 } else if (result->is_uintx()) { 771 uintx uintx_v = (uintx) v; 772 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS; 773 } else if (result->is_uint64_t()) { 774 uint64_t uint64_t_v = (uint64_t) v; 775 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS; 776 } else if (result->is_size_t()) { 777 size_t size_t_v = (size_t) v; 778 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS; 779 } else { 780 return false; 781 } 782} 783 784static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) { 785 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false; 786 // Contract: CommandLineFlags always returns a pointer that needs freeing. 787 FREE_C_HEAP_ARRAY(char, value); 788 return true; 789} 790 791static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) { 792 const char* old_value = ""; 793 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false; 794 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 795 size_t new_len = strlen(new_value); 796 const char* value; 797 char* free_this_too = NULL; 798 if (old_len == 0) { 799 value = new_value; 800 } else if (new_len == 0) { 801 value = old_value; 802 } else { 803 size_t length = old_len + 1 + new_len + 1; 804 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 805 // each new setting adds another LINE to the switch: 806 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 807 value = buf; 808 free_this_too = buf; 809 } 810 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 811 // CommandLineFlags always returns a pointer that needs freeing. 812 FREE_C_HEAP_ARRAY(char, value); 813 if (free_this_too != NULL) { 814 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 815 FREE_C_HEAP_ARRAY(char, free_this_too); 816 } 817 return true; 818} 819 820const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 821 const char* real_name = real_flag_name(arg); 822 JDK_Version since = JDK_Version(); 823 switch (is_deprecated_flag(arg, &since)) { 824 case -1: 825 return NULL; // obsolete or expired, don't process normally 826 case 0: 827 return real_name; 828 case 1: { 829 if (warn) { 830 char version[256]; 831 since.to_string(version, sizeof(version)); 832 if (real_name != arg) { 833 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 834 arg, version, real_name); 835 } else { 836 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 837 arg, version); 838 } 839 } 840 return real_name; 841 } 842 } 843 ShouldNotReachHere(); 844 return NULL; 845} 846 847void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) { 848 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5}; 849 // Set tagset string buffer at max size of 256, large enough for any alias tagset 850 const int max_tagset_size = 256; 851 int max_tagset_len = max_tagset_size - 1; 852 char tagset_buffer[max_tagset_size]; 853 tagset_buffer[0] = '\0'; 854 855 // Write tag-set for aliased logging option, in string list form 856 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]); 857 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) { 858 if (i > 0) { 859 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer)); 860 } 861 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer)); 862 } 863 if (!alf.exactMatch) { 864 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer)); 865 } 866 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.", 867 (on) ? "+" : "-", 868 name, 869 tagset_buffer, 870 (on) ? LogLevel::name(alf.level) : "off"); 871} 872 873AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){ 874 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) { 875 const AliasedLoggingFlag& alf = aliased_logging_flags[i]; 876 if (strcmp(alf.alias_name, name) == 0) { 877 log_deprecated_flag(name, on, alf); 878 return alf; 879 } 880 } 881 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)}; 882 return a; 883} 884 885bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 886 887 // range of acceptable characters spelled out for portability reasons 888#define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 889#define BUFLEN 255 890 char name[BUFLEN+1]; 891 char dummy; 892 const char* real_name; 893 bool warn_if_deprecated = true; 894 895 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 896 AliasedLoggingFlag alf = catch_logging_aliases(name, false); 897 if (alf.alias_name != NULL){ 898 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 899 return true; 900 } 901 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 902 if (real_name == NULL) { 903 return false; 904 } 905 return set_bool_flag(real_name, false, origin); 906 } 907 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 908 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 909 if (alf.alias_name != NULL){ 910 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 911 return true; 912 } 913 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 914 if (real_name == NULL) { 915 return false; 916 } 917 return set_bool_flag(real_name, true, origin); 918 } 919 920 char punct; 921 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 922 const char* value = strchr(arg, '=') + 1; 923 Flag* flag; 924 925 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 926 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 927 if (alf.alias_name != NULL) { 928 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 929 return true; 930 } 931 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 932 if (real_name == NULL) { 933 return false; 934 } 935 flag = Flag::find_flag(real_name); 936 if (flag != NULL && flag->is_ccstr()) { 937 if (flag->ccstr_accumulates()) { 938 return append_to_string_flag(real_name, value, origin); 939 } else { 940 if (value[0] == '\0') { 941 value = NULL; 942 } 943 return set_string_flag(real_name, value, origin); 944 } 945 } else { 946 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 947 } 948 } 949 950 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 951 const char* value = strchr(arg, '=') + 1; 952 // -XX:Foo:=xxx will reset the string flag to the given value. 953 if (value[0] == '\0') { 954 value = NULL; 955 } 956 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 957 if (real_name == NULL) { 958 return false; 959 } 960 return set_string_flag(real_name, value, origin); 961 } 962 963#define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 964#define SIGNED_NUMBER_RANGE "[-0123456789]" 965#define NUMBER_RANGE "[0123456789eE+-]" 966 char value[BUFLEN + 1]; 967 char value2[BUFLEN + 1]; 968 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 969 // Looks like a floating-point number -- try again with more lenient format string 970 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 971 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 972 if (real_name == NULL) { 973 return false; 974 } 975 return set_fp_numeric_flag(real_name, value, origin); 976 } 977 } 978 979#define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 980 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 981 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 982 if (real_name == NULL) { 983 return false; 984 } 985 return set_numeric_flag(real_name, value, origin); 986 } 987 988 return false; 989} 990 991void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 992 assert(bldarray != NULL, "illegal argument"); 993 994 if (arg == NULL) { 995 return; 996 } 997 998 int new_count = *count + 1; 999 1000 // expand the array and add arg to the last element 1001 if (*bldarray == NULL) { 1002 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 1003 } else { 1004 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 1005 } 1006 (*bldarray)[*count] = os::strdup_check_oom(arg); 1007 *count = new_count; 1008} 1009 1010void Arguments::build_jvm_args(const char* arg) { 1011 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1012} 1013 1014void Arguments::build_jvm_flags(const char* arg) { 1015 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1016} 1017 1018// utility function to return a string that concatenates all 1019// strings in a given char** array 1020const char* Arguments::build_resource_string(char** args, int count) { 1021 if (args == NULL || count == 0) { 1022 return NULL; 1023 } 1024 size_t length = 0; 1025 for (int i = 0; i < count; i++) { 1026 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 1027 } 1028 char* s = NEW_RESOURCE_ARRAY(char, length); 1029 char* dst = s; 1030 for (int j = 0; j < count; j++) { 1031 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 1032 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 1033 dst += offset; 1034 length -= offset; 1035 } 1036 return (const char*) s; 1037} 1038 1039void Arguments::print_on(outputStream* st) { 1040 st->print_cr("VM Arguments:"); 1041 if (num_jvm_flags() > 0) { 1042 st->print("jvm_flags: "); print_jvm_flags_on(st); 1043 st->cr(); 1044 } 1045 if (num_jvm_args() > 0) { 1046 st->print("jvm_args: "); print_jvm_args_on(st); 1047 st->cr(); 1048 } 1049 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1050 if (_java_class_path != NULL) { 1051 char* path = _java_class_path->value(); 1052 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1053 } 1054 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1055} 1056 1057void Arguments::print_summary_on(outputStream* st) { 1058 // Print the command line. Environment variables that are helpful for 1059 // reproducing the problem are written later in the hs_err file. 1060 // flags are from setting file 1061 if (num_jvm_flags() > 0) { 1062 st->print_raw("Settings File: "); 1063 print_jvm_flags_on(st); 1064 st->cr(); 1065 } 1066 // args are the command line and environment variable arguments. 1067 st->print_raw("Command Line: "); 1068 if (num_jvm_args() > 0) { 1069 print_jvm_args_on(st); 1070 } 1071 // this is the classfile and any arguments to the java program 1072 if (java_command() != NULL) { 1073 st->print("%s", java_command()); 1074 } 1075 st->cr(); 1076} 1077 1078void Arguments::print_jvm_flags_on(outputStream* st) { 1079 if (_num_jvm_flags > 0) { 1080 for (int i=0; i < _num_jvm_flags; i++) { 1081 st->print("%s ", _jvm_flags_array[i]); 1082 } 1083 } 1084} 1085 1086void Arguments::print_jvm_args_on(outputStream* st) { 1087 if (_num_jvm_args > 0) { 1088 for (int i=0; i < _num_jvm_args; i++) { 1089 st->print("%s ", _jvm_args_array[i]); 1090 } 1091 } 1092} 1093 1094bool Arguments::process_argument(const char* arg, 1095 jboolean ignore_unrecognized, 1096 Flag::Flags origin) { 1097 JDK_Version since = JDK_Version(); 1098 1099 if (parse_argument(arg, origin)) { 1100 return true; 1101 } 1102 1103 // Determine if the flag has '+', '-', or '=' characters. 1104 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1105 const char* const argname = has_plus_minus ? arg + 1 : arg; 1106 1107 size_t arg_len; 1108 const char* equal_sign = strchr(argname, '='); 1109 if (equal_sign == NULL) { 1110 arg_len = strlen(argname); 1111 } else { 1112 arg_len = equal_sign - argname; 1113 } 1114 1115 // Only make the obsolete check for valid arguments. 1116 if (arg_len <= BUFLEN) { 1117 // Construct a string which consists only of the argument name without '+', '-', or '='. 1118 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1119 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1120 if (is_obsolete_flag(stripped_argname, &since)) { 1121 char version[256]; 1122 since.to_string(version, sizeof(version)); 1123 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1124 return true; 1125 } 1126#ifndef PRODUCT 1127 else { 1128 const char* replacement; 1129 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){ 1130 log_warning(arguments)("%s has been removed. Please use %s instead.", 1131 stripped_argname, 1132 replacement); 1133 return false; 1134 } 1135 } 1136#endif //PRODUCT 1137 } 1138 1139 // For locked flags, report a custom error message if available. 1140 // Otherwise, report the standard unrecognized VM option. 1141 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 1142 if (found_flag != NULL) { 1143 char locked_message_buf[BUFLEN]; 1144 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1145 if (strlen(locked_message_buf) == 0) { 1146 if (found_flag->is_bool() && !has_plus_minus) { 1147 jio_fprintf(defaultStream::error_stream(), 1148 "Missing +/- setting for VM option '%s'\n", argname); 1149 } else if (!found_flag->is_bool() && has_plus_minus) { 1150 jio_fprintf(defaultStream::error_stream(), 1151 "Unexpected +/- setting in VM option '%s'\n", argname); 1152 } else { 1153 jio_fprintf(defaultStream::error_stream(), 1154 "Improperly specified VM option '%s'\n", argname); 1155 } 1156 } else { 1157#ifdef PRODUCT 1158 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1159 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1160 if (ignore_unrecognized && mismatched) { 1161 return true; 1162 } 1163#endif 1164 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1165 } 1166 } else { 1167 if (ignore_unrecognized) { 1168 return true; 1169 } 1170 jio_fprintf(defaultStream::error_stream(), 1171 "Unrecognized VM option '%s'\n", argname); 1172 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 1173 if (fuzzy_matched != NULL) { 1174 jio_fprintf(defaultStream::error_stream(), 1175 "Did you mean '%s%s%s'? ", 1176 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1177 fuzzy_matched->_name, 1178 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1179 } 1180 } 1181 1182 // allow for commandline "commenting out" options like -XX:#+Verbose 1183 return arg[0] == '#'; 1184} 1185 1186bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1187 FILE* stream = fopen(file_name, "rb"); 1188 if (stream == NULL) { 1189 if (should_exist) { 1190 jio_fprintf(defaultStream::error_stream(), 1191 "Could not open settings file %s\n", file_name); 1192 return false; 1193 } else { 1194 return true; 1195 } 1196 } 1197 1198 char token[1024]; 1199 int pos = 0; 1200 1201 bool in_white_space = true; 1202 bool in_comment = false; 1203 bool in_quote = false; 1204 char quote_c = 0; 1205 bool result = true; 1206 1207 int c = getc(stream); 1208 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1209 if (in_white_space) { 1210 if (in_comment) { 1211 if (c == '\n') in_comment = false; 1212 } else { 1213 if (c == '#') in_comment = true; 1214 else if (!isspace(c)) { 1215 in_white_space = false; 1216 token[pos++] = c; 1217 } 1218 } 1219 } else { 1220 if (c == '\n' || (!in_quote && isspace(c))) { 1221 // token ends at newline, or at unquoted whitespace 1222 // this allows a way to include spaces in string-valued options 1223 token[pos] = '\0'; 1224 logOption(token); 1225 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1226 build_jvm_flags(token); 1227 pos = 0; 1228 in_white_space = true; 1229 in_quote = false; 1230 } else if (!in_quote && (c == '\'' || c == '"')) { 1231 in_quote = true; 1232 quote_c = c; 1233 } else if (in_quote && (c == quote_c)) { 1234 in_quote = false; 1235 } else { 1236 token[pos++] = c; 1237 } 1238 } 1239 c = getc(stream); 1240 } 1241 if (pos > 0) { 1242 token[pos] = '\0'; 1243 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1244 build_jvm_flags(token); 1245 } 1246 fclose(stream); 1247 return result; 1248} 1249 1250//============================================================================================================= 1251// Parsing of properties (-D) 1252 1253const char* Arguments::get_property(const char* key) { 1254 return PropertyList_get_value(system_properties(), key); 1255} 1256 1257bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1258 const char* eq = strchr(prop, '='); 1259 const char* key; 1260 const char* value = ""; 1261 1262 if (eq == NULL) { 1263 // property doesn't have a value, thus use passed string 1264 key = prop; 1265 } else { 1266 // property have a value, thus extract it and save to the 1267 // allocated string 1268 size_t key_len = eq - prop; 1269 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1270 1271 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1272 key = tmp_key; 1273 1274 value = &prop[key_len + 1]; 1275 } 1276 1277 if (strcmp(key, "java.compiler") == 0) { 1278 process_java_compiler_argument(value); 1279 // Record value in Arguments, but let it get passed to Java. 1280 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1281 strcmp(key, "sun.java.launcher.pid") == 0) { 1282 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1283 // private and are processed in process_sun_java_launcher_properties(); 1284 // the sun.java.launcher property is passed on to the java application 1285 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1286 // append is true, writable is true, internal is false 1287 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1288 WriteableProperty, ExternalProperty); 1289 } else { 1290 if (strcmp(key, "sun.java.command") == 0) { 1291 char *old_java_command = _java_command; 1292 _java_command = os::strdup_check_oom(value, mtArguments); 1293 if (old_java_command != NULL) { 1294 os::free(old_java_command); 1295 } 1296 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1297 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1298 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1299 // its value without going through the property list or making a Java call. 1300 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1301 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1302 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1303 os::free((void *)old_java_vendor_url_bug); 1304 } 1305 } 1306 1307 // Create new property and add at the end of the list 1308 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1309 } 1310 1311 if (key != prop) { 1312 // SystemProperty copy passed value, thus free previously allocated 1313 // memory 1314 FreeHeap((void *)key); 1315 } 1316 1317 return true; 1318} 1319 1320#if INCLUDE_CDS 1321void Arguments::check_unsupported_dumping_properties() { 1322 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump"); 1323 const char* unsupported_properties[] = { "jdk.module.main", 1324 "jdk.module.limitmods", 1325 "jdk.module.path", 1326 "jdk.module.upgrade.path", 1327 "jdk.module.addmods.0", 1328 "jdk.module.patch.0" }; 1329 const char* unsupported_options[] = { "-m", // cannot use at dump time 1330 "--limit-modules", // ignored at dump time 1331 "--module-path", // ignored at dump time 1332 "--upgrade-module-path", // ignored at dump time 1333 "--add-modules", // ignored at dump time 1334 "--patch-module" // ignored at dump time 1335 }; 1336 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1337 // If a vm option is found in the unsupported_options array with index less than the info_idx, 1338 // vm will exit with an error message. Otherwise, it will print an informational message if 1339 // PrintSharedSpaces is enabled. 1340 uint info_idx = 1; 1341 SystemProperty* sp = system_properties(); 1342 while (sp != NULL) { 1343 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1344 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1345 if (i < info_idx) { 1346 vm_exit_during_initialization( 1347 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1348 } else { 1349 if (PrintSharedSpaces) { 1350 tty->print_cr( 1351 "Info: the %s option is ignored when dumping the shared archive", unsupported_options[i]); 1352 } 1353 } 1354 } 1355 } 1356 sp = sp->next(); 1357 } 1358 1359 // Check for an exploded module build in use with -Xshare:dump. 1360 if (!has_jimage()) { 1361 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1362 } 1363} 1364#endif 1365 1366//=========================================================================================================== 1367// Setting int/mixed/comp mode flags 1368 1369void Arguments::set_mode_flags(Mode mode) { 1370 // Set up default values for all flags. 1371 // If you add a flag to any of the branches below, 1372 // add a default value for it here. 1373 set_java_compiler(false); 1374 _mode = mode; 1375 1376 // Ensure Agent_OnLoad has the correct initial values. 1377 // This may not be the final mode; mode may change later in onload phase. 1378 PropertyList_unique_add(&_system_properties, "java.vm.info", 1379 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1380 1381 UseInterpreter = true; 1382 UseCompiler = true; 1383 UseLoopCounter = true; 1384 1385 // Default values may be platform/compiler dependent - 1386 // use the saved values 1387 ClipInlining = Arguments::_ClipInlining; 1388 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1389 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1390 BackgroundCompilation = Arguments::_BackgroundCompilation; 1391 if (TieredCompilation) { 1392 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1393 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1394 } 1395 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1396 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1397 } 1398 } 1399 1400 // Change from defaults based on mode 1401 switch (mode) { 1402 default: 1403 ShouldNotReachHere(); 1404 break; 1405 case _int: 1406 UseCompiler = false; 1407 UseLoopCounter = false; 1408 AlwaysCompileLoopMethods = false; 1409 UseOnStackReplacement = false; 1410 break; 1411 case _mixed: 1412 // same as default 1413 break; 1414 case _comp: 1415 UseInterpreter = false; 1416 BackgroundCompilation = false; 1417 ClipInlining = false; 1418 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1419 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1420 // compile a level 4 (C2) and then continue executing it. 1421 if (TieredCompilation) { 1422 Tier3InvokeNotifyFreqLog = 0; 1423 Tier4InvocationThreshold = 0; 1424 } 1425 break; 1426 } 1427} 1428 1429// Conflict: required to use shared spaces (-Xshare:on), but 1430// incompatible command line options were chosen. 1431static void no_shared_spaces(const char* message) { 1432 if (RequireSharedSpaces) { 1433 jio_fprintf(defaultStream::error_stream(), 1434 "Class data sharing is inconsistent with other specified options.\n"); 1435 vm_exit_during_initialization("Unable to use shared archive.", message); 1436 } else { 1437 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1438 } 1439} 1440 1441// Returns threshold scaled with the value of scale. 1442// If scale < 0.0, threshold is returned without scaling. 1443intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1444 if (scale == 1.0 || scale < 0.0) { 1445 return threshold; 1446 } else { 1447 return (intx)(threshold * scale); 1448 } 1449} 1450 1451// Returns freq_log scaled with the value of scale. 1452// Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1453// If scale < 0.0, freq_log is returned without scaling. 1454intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1455 // Check if scaling is necessary or if negative value was specified. 1456 if (scale == 1.0 || scale < 0.0) { 1457 return freq_log; 1458 } 1459 // Check values to avoid calculating log2 of 0. 1460 if (scale == 0.0 || freq_log == 0) { 1461 return 0; 1462 } 1463 // Determine the maximum notification frequency value currently supported. 1464 // The largest mask value that the interpreter/C1 can handle is 1465 // of length InvocationCounter::number_of_count_bits. Mask values are always 1466 // one bit shorter then the value of the notification frequency. Set 1467 // max_freq_bits accordingly. 1468 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1469 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1470 if (scaled_freq == 0) { 1471 // Return 0 right away to avoid calculating log2 of 0. 1472 return 0; 1473 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1474 return max_freq_bits; 1475 } else { 1476 return log2_intptr(scaled_freq); 1477 } 1478} 1479 1480void Arguments::set_tiered_flags() { 1481 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1482 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1483 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1484 } 1485 if (CompilationPolicyChoice < 2) { 1486 vm_exit_during_initialization( 1487 "Incompatible compilation policy selected", NULL); 1488 } 1489 // Increase the code cache size - tiered compiles a lot more. 1490 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1491 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1492 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1493 } 1494 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1495 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1496 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1497 } 1498 if (!UseInterpreter) { // -Xcomp 1499 Tier3InvokeNotifyFreqLog = 0; 1500 Tier4InvocationThreshold = 0; 1501 } 1502 1503 if (CompileThresholdScaling < 0) { 1504 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1505 } 1506 1507 // Scale tiered compilation thresholds. 1508 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1509 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1510 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1511 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1512 1513 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1514 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1515 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1516 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1517 1518 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1519 // once these thresholds become supported. 1520 1521 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1522 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1523 1524 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1525 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1526 1527 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1528 1529 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1530 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1531 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1532 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1533 } 1534} 1535 1536#if INCLUDE_ALL_GCS 1537static void disable_adaptive_size_policy(const char* collector_name) { 1538 if (UseAdaptiveSizePolicy) { 1539 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1540 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1541 collector_name); 1542 } 1543 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1544 } 1545} 1546 1547void Arguments::set_parnew_gc_flags() { 1548 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1549 "control point invariant"); 1550 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1551 assert(UseParNewGC, "ParNew should always be used with CMS"); 1552 1553 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1554 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1555 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1556 } else if (ParallelGCThreads == 0) { 1557 jio_fprintf(defaultStream::error_stream(), 1558 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1559 vm_exit(1); 1560 } 1561 1562 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1563 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1564 // we set them to 1024 and 1024. 1565 // See CR 6362902. 1566 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1567 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1568 } 1569 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1570 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1571 } 1572 1573 // When using compressed oops, we use local overflow stacks, 1574 // rather than using a global overflow list chained through 1575 // the klass word of the object's pre-image. 1576 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1577 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1578 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1579 } 1580 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1581 } 1582 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1583} 1584 1585// Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1586// sparc/solaris for certain applications, but would gain from 1587// further optimization and tuning efforts, and would almost 1588// certainly gain from analysis of platform and environment. 1589void Arguments::set_cms_and_parnew_gc_flags() { 1590 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1591 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1592 assert(UseParNewGC, "ParNew should always be used with CMS"); 1593 1594 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1595 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1596 1597 set_parnew_gc_flags(); 1598 1599 size_t max_heap = align_size_down(MaxHeapSize, 1600 CardTableRS::ct_max_alignment_constraint()); 1601 1602 // Now make adjustments for CMS 1603 intx tenuring_default = (intx)6; 1604 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1605 1606 // Preferred young gen size for "short" pauses: 1607 // upper bound depends on # of threads and NewRatio. 1608 const size_t preferred_max_new_size_unaligned = 1609 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads)); 1610 size_t preferred_max_new_size = 1611 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1612 1613 // Unless explicitly requested otherwise, size young gen 1614 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1615 1616 // If either MaxNewSize or NewRatio is set on the command line, 1617 // assume the user is trying to set the size of the young gen. 1618 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1619 1620 // Set MaxNewSize to our calculated preferred_max_new_size unless 1621 // NewSize was set on the command line and it is larger than 1622 // preferred_max_new_size. 1623 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1624 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1625 } else { 1626 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size); 1627 } 1628 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1629 1630 // Code along this path potentially sets NewSize and OldSize 1631 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT, 1632 min_heap_size(), InitialHeapSize, max_heap); 1633 size_t min_new = preferred_max_new_size; 1634 if (FLAG_IS_CMDLINE(NewSize)) { 1635 min_new = NewSize; 1636 } 1637 if (max_heap > min_new && min_heap_size() > min_new) { 1638 // Unless explicitly requested otherwise, make young gen 1639 // at least min_new, and at most preferred_max_new_size. 1640 if (FLAG_IS_DEFAULT(NewSize)) { 1641 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new)); 1642 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize)); 1643 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1644 } 1645 // Unless explicitly requested otherwise, size old gen 1646 // so it's NewRatio x of NewSize. 1647 if (FLAG_IS_DEFAULT(OldSize)) { 1648 if (max_heap > NewSize) { 1649 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1650 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1651 } 1652 } 1653 } 1654 } 1655 // Unless explicitly requested otherwise, definitely 1656 // promote all objects surviving "tenuring_default" scavenges. 1657 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1658 FLAG_IS_DEFAULT(SurvivorRatio)) { 1659 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1660 } 1661 // If we decided above (or user explicitly requested) 1662 // `promote all' (via MaxTenuringThreshold := 0), 1663 // prefer minuscule survivor spaces so as not to waste 1664 // space for (non-existent) survivors 1665 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1666 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1667 } 1668 1669 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1670 // but rather the number of free blocks of a given size that are used when 1671 // replenishing the local per-worker free list caches. 1672 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1673 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1674 // OldPLAB sizing manually turned off: Use a larger default setting, 1675 // unless it was manually specified. This is because a too-low value 1676 // will slow down scavenges. 1677 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166 1678 } else { 1679 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1680 } 1681 } 1682 1683 // If either of the static initialization defaults have changed, note this 1684 // modification. 1685 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1686 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight); 1687 } 1688 1689 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1690} 1691#endif // INCLUDE_ALL_GCS 1692 1693void set_object_alignment() { 1694 // Object alignment. 1695 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1696 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1697 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1698 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1699 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1700 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1701 1702 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1703 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1704 1705 // Oop encoding heap max 1706 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1707 1708 if (SurvivorAlignmentInBytes == 0) { 1709 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1710 } 1711 1712#if INCLUDE_ALL_GCS 1713 // Set CMS global values 1714 CompactibleFreeListSpace::set_cms_values(); 1715#endif // INCLUDE_ALL_GCS 1716} 1717 1718size_t Arguments::max_heap_for_compressed_oops() { 1719 // Avoid sign flip. 1720 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1721 // We need to fit both the NULL page and the heap into the memory budget, while 1722 // keeping alignment constraints of the heap. To guarantee the latter, as the 1723 // NULL page is located before the heap, we pad the NULL page to the conservative 1724 // maximum alignment that the GC may ever impose upon the heap. 1725 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1726 _conservative_max_heap_alignment); 1727 1728 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1729 NOT_LP64(ShouldNotReachHere(); return 0); 1730} 1731 1732bool Arguments::should_auto_select_low_pause_collector() { 1733 if (UseAutoGCSelectPolicy && 1734 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1735 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1736 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1737 return true; 1738 } 1739 return false; 1740} 1741 1742void Arguments::set_use_compressed_oops() { 1743#ifndef ZERO 1744#ifdef _LP64 1745 // MaxHeapSize is not set up properly at this point, but 1746 // the only value that can override MaxHeapSize if we are 1747 // to use UseCompressedOops is InitialHeapSize. 1748 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1749 1750 if (max_heap_size <= max_heap_for_compressed_oops()) { 1751#if !defined(COMPILER1) || defined(TIERED) 1752 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1753 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1754 } 1755#endif 1756 } else { 1757 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1758 warning("Max heap size too large for Compressed Oops"); 1759 FLAG_SET_DEFAULT(UseCompressedOops, false); 1760 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1761 } 1762 } 1763#endif // _LP64 1764#endif // ZERO 1765} 1766 1767 1768// NOTE: set_use_compressed_klass_ptrs() must be called after calling 1769// set_use_compressed_oops(). 1770void Arguments::set_use_compressed_klass_ptrs() { 1771#ifndef ZERO 1772#ifdef _LP64 1773 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1774 if (!UseCompressedOops) { 1775 if (UseCompressedClassPointers) { 1776 warning("UseCompressedClassPointers requires UseCompressedOops"); 1777 } 1778 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1779 } else { 1780 // Turn on UseCompressedClassPointers too 1781 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1782 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1783 } 1784 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1785 if (UseCompressedClassPointers) { 1786 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1787 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1788 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1789 } 1790 } 1791 } 1792#endif // _LP64 1793#endif // !ZERO 1794} 1795 1796void Arguments::set_conservative_max_heap_alignment() { 1797 // The conservative maximum required alignment for the heap is the maximum of 1798 // the alignments imposed by several sources: any requirements from the heap 1799 // itself, the collector policy and the maximum page size we may run the VM 1800 // with. 1801 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1802#if INCLUDE_ALL_GCS 1803 if (UseParallelGC) { 1804 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1805 } else if (UseG1GC) { 1806 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1807 } 1808#endif // INCLUDE_ALL_GCS 1809 _conservative_max_heap_alignment = MAX4(heap_alignment, 1810 (size_t)os::vm_allocation_granularity(), 1811 os::max_page_size(), 1812 CollectorPolicy::compute_heap_alignment()); 1813} 1814 1815bool Arguments::gc_selected() { 1816#if INCLUDE_ALL_GCS 1817 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC; 1818#else 1819 return UseSerialGC; 1820#endif // INCLUDE_ALL_GCS 1821} 1822 1823#ifdef TIERED 1824bool Arguments::compilation_mode_selected() { 1825 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) || 1826 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler)); 1827 1828} 1829 1830void Arguments::select_compilation_mode_ergonomically() { 1831#if defined(_WINDOWS) && !defined(_LP64) 1832 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) { 1833 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true); 1834 } 1835#endif 1836 if (NeverActAsServerClassMachine) { 1837 set_client_compilation_mode(); 1838 } 1839} 1840#endif //TIERED 1841 1842void Arguments::select_gc_ergonomically() { 1843#if INCLUDE_ALL_GCS 1844 if (os::is_server_class_machine()) { 1845 if (!UseAutoGCSelectPolicy) { 1846 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true); 1847 } else { 1848 if (should_auto_select_low_pause_collector()) { 1849 FLAG_SET_ERGO_IF_DEFAULT(bool, UseConcMarkSweepGC, true); 1850 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParNewGC, true); 1851 } else { 1852 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParallelGC, true); 1853 } 1854 } 1855 } else { 1856 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1857 } 1858#else 1859 UNSUPPORTED_OPTION(UseG1GC); 1860 UNSUPPORTED_OPTION(UseParallelGC); 1861 UNSUPPORTED_OPTION(UseParallelOldGC); 1862 UNSUPPORTED_OPTION(UseConcMarkSweepGC); 1863 UNSUPPORTED_OPTION(UseParNewGC); 1864 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1865#endif // INCLUDE_ALL_GCS 1866} 1867 1868void Arguments::select_gc() { 1869 if (!gc_selected()) { 1870 select_gc_ergonomically(); 1871 if (!gc_selected()) { 1872 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL); 1873 } 1874 } 1875} 1876 1877#if INCLUDE_JVMCI 1878void Arguments::set_jvmci_specific_flags() { 1879 if (UseJVMCICompiler) { 1880 if (FLAG_IS_DEFAULT(TypeProfileWidth)) { 1881 FLAG_SET_DEFAULT(TypeProfileWidth, 8); 1882 } 1883 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) { 1884 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933); 1885 } 1886 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1887 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M); 1888 } 1889 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) { 1890 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M); 1891 } 1892 if (FLAG_IS_DEFAULT(MetaspaceSize)) { 1893 FLAG_SET_DEFAULT(MetaspaceSize, 12*M); 1894 } 1895 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) { 1896 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K); 1897 } 1898 if (TieredStopAtLevel != CompLevel_full_optimization) { 1899 // Currently JVMCI compiler can only work at the full optimization level 1900 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled"); 1901 TieredStopAtLevel = CompLevel_full_optimization; 1902 } 1903 if (FLAG_IS_DEFAULT(TypeProfileLevel)) { 1904 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 1905 } 1906 } 1907} 1908#endif 1909 1910void Arguments::set_ergonomics_flags() { 1911#ifdef TIERED 1912 if (!compilation_mode_selected()) { 1913 select_compilation_mode_ergonomically(); 1914 } 1915#endif 1916 select_gc(); 1917 1918#if defined(COMPILER2) || INCLUDE_JVMCI 1919 // Shared spaces work fine with other GCs but causes bytecode rewriting 1920 // to be disabled, which hurts interpreter performance and decreases 1921 // server performance. When -server is specified, keep the default off 1922 // unless it is asked for. Future work: either add bytecode rewriting 1923 // at link time, or rewrite bytecodes in non-shared methods. 1924 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces && 1925 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1926 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1927 } 1928#endif 1929 1930 set_conservative_max_heap_alignment(); 1931 1932#ifndef ZERO 1933#ifdef _LP64 1934 set_use_compressed_oops(); 1935 1936 // set_use_compressed_klass_ptrs() must be called after calling 1937 // set_use_compressed_oops(). 1938 set_use_compressed_klass_ptrs(); 1939 1940 // Also checks that certain machines are slower with compressed oops 1941 // in vm_version initialization code. 1942#endif // _LP64 1943#endif // !ZERO 1944 1945} 1946 1947void Arguments::set_parallel_gc_flags() { 1948 assert(UseParallelGC || UseParallelOldGC, "Error"); 1949 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1950 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1951 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1952 } 1953 FLAG_SET_DEFAULT(UseParallelGC, true); 1954 1955 // If no heap maximum was requested explicitly, use some reasonable fraction 1956 // of the physical memory, up to a maximum of 1GB. 1957 FLAG_SET_DEFAULT(ParallelGCThreads, 1958 Abstract_VM_Version::parallel_worker_threads()); 1959 if (ParallelGCThreads == 0) { 1960 jio_fprintf(defaultStream::error_stream(), 1961 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1962 vm_exit(1); 1963 } 1964 1965 if (UseAdaptiveSizePolicy) { 1966 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1967 // unless the user actually sets these flags. 1968 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1969 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1970 } 1971 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1972 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1973 } 1974 } 1975 1976 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1977 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1978 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1979 // See CR 6362902 for details. 1980 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1981 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1982 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1983 } 1984 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1985 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1986 } 1987 } 1988 1989 if (UseParallelOldGC) { 1990 // Par compact uses lower default values since they are treated as 1991 // minimums. These are different defaults because of the different 1992 // interpretation and are not ergonomically set. 1993 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1994 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1995 } 1996 } 1997} 1998 1999void Arguments::set_g1_gc_flags() { 2000 assert(UseG1GC, "Error"); 2001#if defined(COMPILER1) || INCLUDE_JVMCI 2002 FastTLABRefill = false; 2003#endif 2004 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 2005 if (ParallelGCThreads == 0) { 2006 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 2007 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 2008 } 2009 2010#if INCLUDE_ALL_GCS 2011 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) { 2012 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads); 2013 } 2014#endif 2015 2016 // MarkStackSize will be set (if it hasn't been set by the user) 2017 // when concurrent marking is initialized. 2018 // Its value will be based upon the number of parallel marking threads. 2019 // But we do set the maximum mark stack size here. 2020 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 2021 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 2022 } 2023 2024 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 2025 // In G1, we want the default GC overhead goal to be higher than 2026 // it is for PS, or the heap might be expanded too aggressively. 2027 // We set it here to ~8%. 2028 FLAG_SET_DEFAULT(GCTimeRatio, 12); 2029 } 2030 2031 // Below, we might need to calculate the pause time interval based on 2032 // the pause target. When we do so we are going to give G1 maximum 2033 // flexibility and allow it to do pauses when it needs to. So, we'll 2034 // arrange that the pause interval to be pause time target + 1 to 2035 // ensure that a) the pause time target is maximized with respect to 2036 // the pause interval and b) we maintain the invariant that pause 2037 // time target < pause interval. If the user does not want this 2038 // maximum flexibility, they will have to set the pause interval 2039 // explicitly. 2040 2041 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { 2042 // The default pause time target in G1 is 200ms 2043 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); 2044 } 2045 2046 // Then, if the interval parameter was not set, set it according to 2047 // the pause time target (this will also deal with the case when the 2048 // pause time target is the default value). 2049 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { 2050 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); 2051 } 2052 2053 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 2054} 2055 2056void Arguments::set_gc_specific_flags() { 2057#if INCLUDE_ALL_GCS 2058 // Set per-collector flags 2059 if (UseParallelGC || UseParallelOldGC) { 2060 set_parallel_gc_flags(); 2061 } else if (UseConcMarkSweepGC) { 2062 set_cms_and_parnew_gc_flags(); 2063 } else if (UseG1GC) { 2064 set_g1_gc_flags(); 2065 } 2066 if (AssumeMP && !UseSerialGC) { 2067 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 2068 warning("If the number of processors is expected to increase from one, then" 2069 " you should configure the number of parallel GC threads appropriately" 2070 " using -XX:ParallelGCThreads=N"); 2071 } 2072 } 2073 if (MinHeapFreeRatio == 100) { 2074 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 2075 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 2076 } 2077 2078 // If class unloading is disabled, also disable concurrent class unloading. 2079 if (!ClassUnloading) { 2080 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false); 2081 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false); 2082 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false); 2083 } 2084#endif // INCLUDE_ALL_GCS 2085} 2086 2087julong Arguments::limit_by_allocatable_memory(julong limit) { 2088 julong max_allocatable; 2089 julong result = limit; 2090 if (os::has_allocatable_memory_limit(&max_allocatable)) { 2091 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 2092 } 2093 return result; 2094} 2095 2096// Use static initialization to get the default before parsing 2097static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 2098 2099void Arguments::set_heap_size() { 2100 julong phys_mem = 2101 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 2102 : (julong)MaxRAM; 2103 2104 // Experimental support for CGroup memory limits 2105 if (UseCGroupMemoryLimitForHeap) { 2106 // This is a rough indicator that a CGroup limit may be in force 2107 // for this process 2108 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes"; 2109 FILE *fp = fopen(lim_file, "r"); 2110 if (fp != NULL) { 2111 julong cgroup_max = 0; 2112 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max); 2113 if (ret == 1 && cgroup_max > 0) { 2114 // If unlimited, cgroup_max will be a very large, but unspecified 2115 // value, so use initial phys_mem as a limit 2116 log_info(gc, heap)("Setting phys_mem to the min of cgroup limit (" 2117 JULONG_FORMAT "MB) and initial phys_mem (" 2118 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M); 2119 phys_mem = MIN2(cgroup_max, phys_mem); 2120 } else { 2121 warning("Unable to read/parse cgroup memory limit from %s: %s", 2122 lim_file, errno != 0 ? strerror(errno) : "unknown error"); 2123 } 2124 fclose(fp); 2125 } else { 2126 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno)); 2127 } 2128 } 2129 2130 // If the maximum heap size has not been set with -Xmx, 2131 // then set it as fraction of the size of physical memory, 2132 // respecting the maximum and minimum sizes of the heap. 2133 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2134 julong reasonable_max = phys_mem / MaxRAMFraction; 2135 2136 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 2137 // Small physical memory, so use a minimum fraction of it for the heap 2138 reasonable_max = phys_mem / MinRAMFraction; 2139 } else { 2140 // Not-small physical memory, so require a heap at least 2141 // as large as MaxHeapSize 2142 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 2143 } 2144 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 2145 // Limit the heap size to ErgoHeapSizeLimit 2146 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 2147 } 2148 if (UseCompressedOops) { 2149 // Limit the heap size to the maximum possible when using compressed oops 2150 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 2151 2152 // HeapBaseMinAddress can be greater than default but not less than. 2153 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 2154 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 2155 // matches compressed oops printing flags 2156 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 2157 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 2158 DefaultHeapBaseMinAddress, 2159 DefaultHeapBaseMinAddress/G, 2160 HeapBaseMinAddress); 2161 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 2162 } 2163 } 2164 2165 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 2166 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 2167 // but it should be not less than default MaxHeapSize. 2168 max_coop_heap -= HeapBaseMinAddress; 2169 } 2170 reasonable_max = MIN2(reasonable_max, max_coop_heap); 2171 } 2172 reasonable_max = limit_by_allocatable_memory(reasonable_max); 2173 2174 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 2175 // An initial heap size was specified on the command line, 2176 // so be sure that the maximum size is consistent. Done 2177 // after call to limit_by_allocatable_memory because that 2178 // method might reduce the allocation size. 2179 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 2180 } 2181 2182 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 2183 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 2184 } 2185 2186 // If the minimum or initial heap_size have not been set or requested to be set 2187 // ergonomically, set them accordingly. 2188 if (InitialHeapSize == 0 || min_heap_size() == 0) { 2189 julong reasonable_minimum = (julong)(OldSize + NewSize); 2190 2191 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 2192 2193 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 2194 2195 if (InitialHeapSize == 0) { 2196 julong reasonable_initial = phys_mem / InitialRAMFraction; 2197 2198 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 2199 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 2200 2201 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 2202 2203 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 2204 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 2205 } 2206 // If the minimum heap size has not been set (via -Xms), 2207 // synchronize with InitialHeapSize to avoid errors with the default value. 2208 if (min_heap_size() == 0) { 2209 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 2210 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 2211 } 2212 } 2213} 2214 2215// This option inspects the machine and attempts to set various 2216// parameters to be optimal for long-running, memory allocation 2217// intensive jobs. It is intended for machines with large 2218// amounts of cpu and memory. 2219jint Arguments::set_aggressive_heap_flags() { 2220 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2221 // VM, but we may not be able to represent the total physical memory 2222 // available (like having 8gb of memory on a box but using a 32bit VM). 2223 // Thus, we need to make sure we're using a julong for intermediate 2224 // calculations. 2225 julong initHeapSize; 2226 julong total_memory = os::physical_memory(); 2227 2228 if (total_memory < (julong) 256 * M) { 2229 jio_fprintf(defaultStream::error_stream(), 2230 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2231 vm_exit(1); 2232 } 2233 2234 // The heap size is half of available memory, or (at most) 2235 // all of possible memory less 160mb (leaving room for the OS 2236 // when using ISM). This is the maximum; because adaptive sizing 2237 // is turned on below, the actual space used may be smaller. 2238 2239 initHeapSize = MIN2(total_memory / (julong) 2, 2240 total_memory - (julong) 160 * M); 2241 2242 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2243 2244 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2245 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) { 2246 return JNI_EINVAL; 2247 } 2248 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) { 2249 return JNI_EINVAL; 2250 } 2251 // Currently the minimum size and the initial heap sizes are the same. 2252 set_min_heap_size(initHeapSize); 2253 } 2254 if (FLAG_IS_DEFAULT(NewSize)) { 2255 // Make the young generation 3/8ths of the total heap. 2256 if (FLAG_SET_CMDLINE(size_t, NewSize, 2257 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) { 2258 return JNI_EINVAL; 2259 } 2260 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) { 2261 return JNI_EINVAL; 2262 } 2263 } 2264 2265#if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 2266 FLAG_SET_DEFAULT(UseLargePages, true); 2267#endif 2268 2269 // Increase some data structure sizes for efficiency 2270 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) { 2271 return JNI_EINVAL; 2272 } 2273 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) { 2274 return JNI_EINVAL; 2275 } 2276 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) { 2277 return JNI_EINVAL; 2278 } 2279 2280 // See the OldPLABSize comment below, but replace 'after promotion' 2281 // with 'after copying'. YoungPLABSize is the size of the survivor 2282 // space per-gc-thread buffers. The default is 4kw. 2283 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words 2284 return JNI_EINVAL; 2285 } 2286 2287 // OldPLABSize is the size of the buffers in the old gen that 2288 // UseParallelGC uses to promote live data that doesn't fit in the 2289 // survivor spaces. At any given time, there's one for each gc thread. 2290 // The default size is 1kw. These buffers are rarely used, since the 2291 // survivor spaces are usually big enough. For specjbb, however, there 2292 // are occasions when there's lots of live data in the young gen 2293 // and we end up promoting some of it. We don't have a definite 2294 // explanation for why bumping OldPLABSize helps, but the theory 2295 // is that a bigger PLAB results in retaining something like the 2296 // original allocation order after promotion, which improves mutator 2297 // locality. A minor effect may be that larger PLABs reduce the 2298 // number of PLAB allocation events during gc. The value of 8kw 2299 // was arrived at by experimenting with specjbb. 2300 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words 2301 return JNI_EINVAL; 2302 } 2303 2304 // Enable parallel GC and adaptive generation sizing 2305 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) { 2306 return JNI_EINVAL; 2307 } 2308 2309 // Encourage steady state memory management 2310 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) { 2311 return JNI_EINVAL; 2312 } 2313 2314 // This appears to improve mutator locality 2315 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 2316 return JNI_EINVAL; 2317 } 2318 2319 // Get around early Solaris scheduling bug 2320 // (affinity vs other jobs on system) 2321 // but disallow DR and offlining (5008695). 2322 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) { 2323 return JNI_EINVAL; 2324 } 2325 2326 return JNI_OK; 2327} 2328 2329// This must be called after ergonomics. 2330void Arguments::set_bytecode_flags() { 2331 if (!RewriteBytecodes) { 2332 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 2333 } 2334} 2335 2336// Aggressive optimization flags -XX:+AggressiveOpts 2337jint Arguments::set_aggressive_opts_flags() { 2338#ifdef COMPILER2 2339 if (AggressiveUnboxing) { 2340 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2341 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2342 } else if (!EliminateAutoBox) { 2343 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 2344 AggressiveUnboxing = false; 2345 } 2346 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 2347 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 2348 } else if (!DoEscapeAnalysis) { 2349 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 2350 AggressiveUnboxing = false; 2351 } 2352 } 2353 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2354 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2355 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2356 } 2357 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2358 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 2359 } 2360 2361 // Feed the cache size setting into the JDK 2362 char buffer[1024]; 2363 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2364 if (!add_property(buffer)) { 2365 return JNI_ENOMEM; 2366 } 2367 } 2368 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 2369 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 2370 } 2371#endif 2372 2373 if (AggressiveOpts) { 2374// Sample flag setting code 2375// if (FLAG_IS_DEFAULT(EliminateZeroing)) { 2376// FLAG_SET_DEFAULT(EliminateZeroing, true); 2377// } 2378 } 2379 2380 return JNI_OK; 2381} 2382 2383//=========================================================================================================== 2384// Parsing of java.compiler property 2385 2386void Arguments::process_java_compiler_argument(const char* arg) { 2387 // For backwards compatibility, Djava.compiler=NONE or "" 2388 // causes us to switch to -Xint mode UNLESS -Xdebug 2389 // is also specified. 2390 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2391 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2392 } 2393} 2394 2395void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2396 _sun_java_launcher = os::strdup_check_oom(launcher); 2397} 2398 2399bool Arguments::created_by_java_launcher() { 2400 assert(_sun_java_launcher != NULL, "property must have value"); 2401 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2402} 2403 2404bool Arguments::sun_java_launcher_is_altjvm() { 2405 return _sun_java_launcher_is_altjvm; 2406} 2407 2408//=========================================================================================================== 2409// Parsing of main arguments 2410 2411#if INCLUDE_JVMCI 2412// Check consistency of jvmci vm argument settings. 2413bool Arguments::check_jvmci_args_consistency() { 2414 return JVMCIGlobals::check_jvmci_flags_are_consistent(); 2415} 2416#endif //INCLUDE_JVMCI 2417 2418// Check consistency of GC selection 2419bool Arguments::check_gc_consistency() { 2420 // Ensure that the user has not selected conflicting sets 2421 // of collectors. 2422 uint i = 0; 2423 if (UseSerialGC) i++; 2424 if (UseConcMarkSweepGC) i++; 2425 if (UseParallelGC || UseParallelOldGC) i++; 2426 if (UseG1GC) i++; 2427 if (i > 1) { 2428 jio_fprintf(defaultStream::error_stream(), 2429 "Conflicting collector combinations in option list; " 2430 "please refer to the release notes for the combinations " 2431 "allowed\n"); 2432 return false; 2433 } 2434 2435 if (UseConcMarkSweepGC && !UseParNewGC) { 2436 jio_fprintf(defaultStream::error_stream(), 2437 "It is not possible to combine the DefNew young collector with the CMS collector.\n"); 2438 return false; 2439 } 2440 2441 if (UseParNewGC && !UseConcMarkSweepGC) { 2442 jio_fprintf(defaultStream::error_stream(), 2443 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n"); 2444 return false; 2445 } 2446 2447 return true; 2448} 2449 2450// Check the consistency of vm_init_args 2451bool Arguments::check_vm_args_consistency() { 2452 // Method for adding checks for flag consistency. 2453 // The intent is to warn the user of all possible conflicts, 2454 // before returning an error. 2455 // Note: Needs platform-dependent factoring. 2456 bool status = true; 2457 2458 if (TLABRefillWasteFraction == 0) { 2459 jio_fprintf(defaultStream::error_stream(), 2460 "TLABRefillWasteFraction should be a denominator, " 2461 "not " SIZE_FORMAT "\n", 2462 TLABRefillWasteFraction); 2463 status = false; 2464 } 2465 2466 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2467 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2468 } 2469 2470 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2471 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2472 } 2473 2474 if (GCTimeLimit == 100) { 2475 // Turn off gc-overhead-limit-exceeded checks 2476 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2477 } 2478 2479 status = status && check_gc_consistency(); 2480 2481 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2482 // insists that we hold the requisite locks so that the iteration is 2483 // MT-safe. For the verification at start-up and shut-down, we don't 2484 // yet have a good way of acquiring and releasing these locks, 2485 // which are not visible at the CollectedHeap level. We want to 2486 // be able to acquire these locks and then do the iteration rather 2487 // than just disable the lock verification. This will be fixed under 2488 // bug 4788986. 2489 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2490 if (VerifyDuringStartup) { 2491 warning("Heap verification at start-up disabled " 2492 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2493 VerifyDuringStartup = false; // Disable verification at start-up 2494 } 2495 2496 if (VerifyBeforeExit) { 2497 warning("Heap verification at shutdown disabled " 2498 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2499 VerifyBeforeExit = false; // Disable verification at shutdown 2500 } 2501 } 2502 2503 if (PrintNMTStatistics) { 2504#if INCLUDE_NMT 2505 if (MemTracker::tracking_level() == NMT_off) { 2506#endif // INCLUDE_NMT 2507 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2508 PrintNMTStatistics = false; 2509#if INCLUDE_NMT 2510 } 2511#endif 2512 } 2513 2514#if INCLUDE_JVMCI 2515 status = status && check_jvmci_args_consistency(); 2516 2517 if (EnableJVMCI) { 2518 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", 2519 AddProperty, UnwriteableProperty, InternalProperty); 2520 2521 if (!ScavengeRootsInCode) { 2522 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled"); 2523 ScavengeRootsInCode = 1; 2524 } 2525 } 2526#endif 2527 2528 // Check lower bounds of the code cache 2529 // Template Interpreter code is approximately 3X larger in debug builds. 2530 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2531 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2532 jio_fprintf(defaultStream::error_stream(), 2533 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2534 os::vm_page_size()/K); 2535 status = false; 2536 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2537 jio_fprintf(defaultStream::error_stream(), 2538 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2539 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2540 status = false; 2541 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2542 jio_fprintf(defaultStream::error_stream(), 2543 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2544 min_code_cache_size/K); 2545 status = false; 2546 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2547 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2548 jio_fprintf(defaultStream::error_stream(), 2549 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2550 CODE_CACHE_SIZE_LIMIT/M); 2551 status = false; 2552 } else if (NonNMethodCodeHeapSize < min_code_cache_size) { 2553 jio_fprintf(defaultStream::error_stream(), 2554 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2555 min_code_cache_size/K); 2556 status = false; 2557 } 2558 2559#ifdef _LP64 2560 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2561 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2562 } 2563#endif 2564 2565#ifndef SUPPORT_RESERVED_STACK_AREA 2566 if (StackReservedPages != 0) { 2567 FLAG_SET_CMDLINE(intx, StackReservedPages, 0); 2568 warning("Reserved Stack Area not supported on this platform"); 2569 } 2570#endif 2571 2572 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) { 2573 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) { 2574 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options."); 2575 } 2576 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2577 } 2578 if (UseCompiler && is_interpreter_only()) { 2579 if (!FLAG_IS_DEFAULT(UseCompiler)) { 2580 warning("UseCompiler disabled due to -Xint."); 2581 } 2582 FLAG_SET_CMDLINE(bool, UseCompiler, false); 2583 } 2584#ifdef COMPILER2 2585 if (PostLoopMultiversioning && !RangeCheckElimination) { 2586 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) { 2587 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled."); 2588 } 2589 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false); 2590 } 2591#endif 2592 return status; 2593} 2594 2595bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2596 const char* option_type) { 2597 if (ignore) return false; 2598 2599 const char* spacer = " "; 2600 if (option_type == NULL) { 2601 option_type = ++spacer; // Set both to the empty string. 2602 } 2603 2604 if (os::obsolete_option(option)) { 2605 jio_fprintf(defaultStream::error_stream(), 2606 "Obsolete %s%soption: %s\n", option_type, spacer, 2607 option->optionString); 2608 return false; 2609 } else { 2610 jio_fprintf(defaultStream::error_stream(), 2611 "Unrecognized %s%soption: %s\n", option_type, spacer, 2612 option->optionString); 2613 return true; 2614 } 2615} 2616 2617static const char* user_assertion_options[] = { 2618 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2619}; 2620 2621static const char* system_assertion_options[] = { 2622 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2623}; 2624 2625bool Arguments::parse_uintx(const char* value, 2626 uintx* uintx_arg, 2627 uintx min_size) { 2628 2629 // Check the sign first since atojulong() parses only unsigned values. 2630 bool value_is_positive = !(*value == '-'); 2631 2632 if (value_is_positive) { 2633 julong n; 2634 bool good_return = atojulong(value, &n); 2635 if (good_return) { 2636 bool above_minimum = n >= min_size; 2637 bool value_is_too_large = n > max_uintx; 2638 2639 if (above_minimum && !value_is_too_large) { 2640 *uintx_arg = n; 2641 return true; 2642 } 2643 } 2644 } 2645 return false; 2646} 2647 2648unsigned int addreads_count = 0; 2649unsigned int addexports_count = 0; 2650unsigned int addopens_count = 0; 2651unsigned int addmods_count = 0; 2652unsigned int patch_mod_count = 0; 2653 2654bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2655 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2656 char* property = AllocateHeap(prop_len, mtArguments); 2657 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2658 if (ret < 0 || ret >= (int)prop_len) { 2659 FreeHeap(property); 2660 return false; 2661 } 2662 bool added = add_property(property, UnwriteableProperty, internal); 2663 FreeHeap(property); 2664 return added; 2665} 2666 2667bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2668 // Make sure count is < 1,000. Otherwise, memory allocation will be too small. 2669 if (count < 1000) { 2670 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + 5; 2671 char* property = AllocateHeap(prop_len, mtArguments); 2672 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2673 if (ret < 0 || ret >= (int)prop_len) { 2674 FreeHeap(property); 2675 return false; 2676 } 2677 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2678 FreeHeap(property); 2679 return added; 2680 } 2681 return false; 2682} 2683 2684Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2685 julong* long_arg, 2686 julong min_size) { 2687 if (!atojulong(s, long_arg)) return arg_unreadable; 2688 return check_memory_size(*long_arg, min_size); 2689} 2690 2691// Parse JavaVMInitArgs structure 2692 2693jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2694 const JavaVMInitArgs *java_options_args, 2695 const JavaVMInitArgs *cmd_line_args) { 2696 bool patch_mod_javabase = false; 2697 2698 // Save default settings for some mode flags 2699 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2700 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2701 Arguments::_ClipInlining = ClipInlining; 2702 Arguments::_BackgroundCompilation = BackgroundCompilation; 2703 if (TieredCompilation) { 2704 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2705 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2706 } 2707 2708 // Setup flags for mixed which is the default 2709 set_mode_flags(_mixed); 2710 2711 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2712 // variable (if present). 2713 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2714 if (result != JNI_OK) { 2715 return result; 2716 } 2717 2718 // Parse args structure generated from the command line flags. 2719 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE); 2720 if (result != JNI_OK) { 2721 return result; 2722 } 2723 2724 // Parse args structure generated from the _JAVA_OPTIONS environment 2725 // variable (if present) (mimics classic VM) 2726 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2727 if (result != JNI_OK) { 2728 return result; 2729 } 2730 2731 // Do final processing now that all arguments have been parsed 2732 result = finalize_vm_init_args(); 2733 if (result != JNI_OK) { 2734 return result; 2735 } 2736 2737#if INCLUDE_CDS 2738 if (UseSharedSpaces && patch_mod_javabase) { 2739 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 2740 } 2741#endif 2742 2743 return JNI_OK; 2744} 2745 2746// Checks if name in command-line argument -agent{lib,path}:name[=options] 2747// represents a valid JDWP agent. is_path==true denotes that we 2748// are dealing with -agentpath (case where name is a path), otherwise with 2749// -agentlib 2750bool valid_jdwp_agent(char *name, bool is_path) { 2751 char *_name; 2752 const char *_jdwp = "jdwp"; 2753 size_t _len_jdwp, _len_prefix; 2754 2755 if (is_path) { 2756 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2757 return false; 2758 } 2759 2760 _name++; // skip past last path separator 2761 _len_prefix = strlen(JNI_LIB_PREFIX); 2762 2763 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2764 return false; 2765 } 2766 2767 _name += _len_prefix; 2768 _len_jdwp = strlen(_jdwp); 2769 2770 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2771 _name += _len_jdwp; 2772 } 2773 else { 2774 return false; 2775 } 2776 2777 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2778 return false; 2779 } 2780 2781 return true; 2782 } 2783 2784 if (strcmp(name, _jdwp) == 0) { 2785 return true; 2786 } 2787 2788 return false; 2789} 2790 2791int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2792 // --patch-module=<module>=<file>(<pathsep><file>)* 2793 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2794 // Find the equal sign between the module name and the path specification 2795 const char* module_equal = strchr(patch_mod_tail, '='); 2796 if (module_equal == NULL) { 2797 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2798 return JNI_ERR; 2799 } else { 2800 // Pick out the module name 2801 size_t module_len = module_equal - patch_mod_tail; 2802 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2803 if (module_name != NULL) { 2804 memcpy(module_name, patch_mod_tail, module_len); 2805 *(module_name + module_len) = '\0'; 2806 // The path piece begins one past the module_equal sign 2807 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2808 FREE_C_HEAP_ARRAY(char, module_name); 2809 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2810 return JNI_ENOMEM; 2811 } 2812 } else { 2813 return JNI_ENOMEM; 2814 } 2815 } 2816 return JNI_OK; 2817} 2818 2819jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) { 2820 // For match_option to return remaining or value part of option string 2821 const char* tail; 2822 2823 // iterate over arguments 2824 for (int index = 0; index < args->nOptions; index++) { 2825 bool is_absolute_path = false; // for -agentpath vs -agentlib 2826 2827 const JavaVMOption* option = args->options + index; 2828 2829 if (!match_option(option, "-Djava.class.path", &tail) && 2830 !match_option(option, "-Dsun.java.command", &tail) && 2831 !match_option(option, "-Dsun.java.launcher", &tail)) { 2832 2833 // add all jvm options to the jvm_args string. This string 2834 // is used later to set the java.vm.args PerfData string constant. 2835 // the -Djava.class.path and the -Dsun.java.command options are 2836 // omitted from jvm_args string as each have their own PerfData 2837 // string constant object. 2838 build_jvm_args(option->optionString); 2839 } 2840 2841 // -verbose:[class/module/gc/jni] 2842 if (match_option(option, "-verbose", &tail)) { 2843 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2844 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2845 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2846 } else if (!strcmp(tail, ":module")) { 2847 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2848 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2849 } else if (!strcmp(tail, ":gc")) { 2850 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2851 } else if (!strcmp(tail, ":jni")) { 2852 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) { 2853 return JNI_EINVAL; 2854 } 2855 } 2856 // -da / -ea / -disableassertions / -enableassertions 2857 // These accept an optional class/package name separated by a colon, e.g., 2858 // -da:java.lang.Thread. 2859 } else if (match_option(option, user_assertion_options, &tail, true)) { 2860 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2861 if (*tail == '\0') { 2862 JavaAssertions::setUserClassDefault(enable); 2863 } else { 2864 assert(*tail == ':', "bogus match by match_option()"); 2865 JavaAssertions::addOption(tail + 1, enable); 2866 } 2867 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2868 } else if (match_option(option, system_assertion_options, &tail, false)) { 2869 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2870 JavaAssertions::setSystemClassDefault(enable); 2871 // -bootclasspath: 2872 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2873 jio_fprintf(defaultStream::output_stream(), 2874 "-Xbootclasspath is no longer a supported option.\n"); 2875 return JNI_EINVAL; 2876 // -bootclasspath/a: 2877 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2878 Arguments::append_sysclasspath(tail); 2879 // -bootclasspath/p: 2880 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2881 jio_fprintf(defaultStream::output_stream(), 2882 "-Xbootclasspath/p is no longer a supported option.\n"); 2883 return JNI_EINVAL; 2884 // -Xrun 2885 } else if (match_option(option, "-Xrun", &tail)) { 2886 if (tail != NULL) { 2887 const char* pos = strchr(tail, ':'); 2888 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2889 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2890 jio_snprintf(name, len + 1, "%s", tail); 2891 2892 char *options = NULL; 2893 if(pos != NULL) { 2894 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2895 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2896 } 2897#if !INCLUDE_JVMTI 2898 if (strcmp(name, "jdwp") == 0) { 2899 jio_fprintf(defaultStream::error_stream(), 2900 "Debugging agents are not supported in this VM\n"); 2901 return JNI_ERR; 2902 } 2903#endif // !INCLUDE_JVMTI 2904 add_init_library(name, options); 2905 } 2906 } else if (match_option(option, "--add-reads=", &tail)) { 2907 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) { 2908 return JNI_ENOMEM; 2909 } 2910 } else if (match_option(option, "--add-exports=", &tail)) { 2911 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) { 2912 return JNI_ENOMEM; 2913 } 2914 } else if (match_option(option, "--add-opens=", &tail)) { 2915 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) { 2916 return JNI_ENOMEM; 2917 } 2918 } else if (match_option(option, "--add-modules=", &tail)) { 2919 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) { 2920 return JNI_ENOMEM; 2921 } 2922 } else if (match_option(option, "--limit-modules=", &tail)) { 2923 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) { 2924 return JNI_ENOMEM; 2925 } 2926 } else if (match_option(option, "--module-path=", &tail)) { 2927 if (!create_property("jdk.module.path", tail, ExternalProperty)) { 2928 return JNI_ENOMEM; 2929 } 2930 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2931 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2932 return JNI_ENOMEM; 2933 } 2934 } else if (match_option(option, "--patch-module=", &tail)) { 2935 // --patch-module=<module>=<file>(<pathsep><file>)* 2936 int res = process_patch_mod_option(tail, patch_mod_javabase); 2937 if (res != JNI_OK) { 2938 return res; 2939 } 2940 } else if (match_option(option, "--illegal-access=", &tail)) { 2941 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) { 2942 return JNI_ENOMEM; 2943 } 2944 // -agentlib and -agentpath 2945 } else if (match_option(option, "-agentlib:", &tail) || 2946 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2947 if(tail != NULL) { 2948 const char* pos = strchr(tail, '='); 2949 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2950 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len); 2951 name[len] = '\0'; 2952 2953 char *options = NULL; 2954 if(pos != NULL) { 2955 options = os::strdup_check_oom(pos + 1, mtArguments); 2956 } 2957#if !INCLUDE_JVMTI 2958 if (valid_jdwp_agent(name, is_absolute_path)) { 2959 jio_fprintf(defaultStream::error_stream(), 2960 "Debugging agents are not supported in this VM\n"); 2961 return JNI_ERR; 2962 } 2963#endif // !INCLUDE_JVMTI 2964 add_init_agent(name, options, is_absolute_path); 2965 } 2966 // -javaagent 2967 } else if (match_option(option, "-javaagent:", &tail)) { 2968#if !INCLUDE_JVMTI 2969 jio_fprintf(defaultStream::error_stream(), 2970 "Instrumentation agents are not supported in this VM\n"); 2971 return JNI_ERR; 2972#else 2973 if (tail != NULL) { 2974 size_t length = strlen(tail) + 1; 2975 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2976 jio_snprintf(options, length, "%s", tail); 2977 add_init_agent("instrument", options, false); 2978 // java agents need module java.instrument 2979 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2980 return JNI_ENOMEM; 2981 } 2982 } 2983#endif // !INCLUDE_JVMTI 2984 // -Xnoclassgc 2985 } else if (match_option(option, "-Xnoclassgc")) { 2986 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) { 2987 return JNI_EINVAL; 2988 } 2989 // -Xconcgc 2990 } else if (match_option(option, "-Xconcgc")) { 2991 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) { 2992 return JNI_EINVAL; 2993 } 2994 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC"); 2995 // -Xnoconcgc 2996 } else if (match_option(option, "-Xnoconcgc")) { 2997 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) { 2998 return JNI_EINVAL; 2999 } 3000 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC"); 3001 // -Xbatch 3002 } else if (match_option(option, "-Xbatch")) { 3003 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 3004 return JNI_EINVAL; 3005 } 3006 // -Xmn for compatibility with other JVM vendors 3007 } else if (match_option(option, "-Xmn", &tail)) { 3008 julong long_initial_young_size = 0; 3009 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 3010 if (errcode != arg_in_range) { 3011 jio_fprintf(defaultStream::error_stream(), 3012 "Invalid initial young generation size: %s\n", option->optionString); 3013 describe_range_error(errcode); 3014 return JNI_EINVAL; 3015 } 3016 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 3017 return JNI_EINVAL; 3018 } 3019 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 3020 return JNI_EINVAL; 3021 } 3022 // -Xms 3023 } else if (match_option(option, "-Xms", &tail)) { 3024 julong long_initial_heap_size = 0; 3025 // an initial heap size of 0 means automatically determine 3026 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 3027 if (errcode != arg_in_range) { 3028 jio_fprintf(defaultStream::error_stream(), 3029 "Invalid initial heap size: %s\n", option->optionString); 3030 describe_range_error(errcode); 3031 return JNI_EINVAL; 3032 } 3033 set_min_heap_size((size_t)long_initial_heap_size); 3034 // Currently the minimum size and the initial heap sizes are the same. 3035 // Can be overridden with -XX:InitialHeapSize. 3036 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) { 3037 return JNI_EINVAL; 3038 } 3039 // -Xmx 3040 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 3041 julong long_max_heap_size = 0; 3042 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 3043 if (errcode != arg_in_range) { 3044 jio_fprintf(defaultStream::error_stream(), 3045 "Invalid maximum heap size: %s\n", option->optionString); 3046 describe_range_error(errcode); 3047 return JNI_EINVAL; 3048 } 3049 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) { 3050 return JNI_EINVAL; 3051 } 3052 // Xmaxf 3053 } else if (match_option(option, "-Xmaxf", &tail)) { 3054 char* err; 3055 int maxf = (int)(strtod(tail, &err) * 100); 3056 if (*err != '\0' || *tail == '\0') { 3057 jio_fprintf(defaultStream::error_stream(), 3058 "Bad max heap free percentage size: %s\n", 3059 option->optionString); 3060 return JNI_EINVAL; 3061 } else { 3062 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) { 3063 return JNI_EINVAL; 3064 } 3065 } 3066 // Xminf 3067 } else if (match_option(option, "-Xminf", &tail)) { 3068 char* err; 3069 int minf = (int)(strtod(tail, &err) * 100); 3070 if (*err != '\0' || *tail == '\0') { 3071 jio_fprintf(defaultStream::error_stream(), 3072 "Bad min heap free percentage size: %s\n", 3073 option->optionString); 3074 return JNI_EINVAL; 3075 } else { 3076 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) { 3077 return JNI_EINVAL; 3078 } 3079 } 3080 // -Xss 3081 } else if (match_option(option, "-Xss", &tail)) { 3082 julong long_ThreadStackSize = 0; 3083 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 3084 if (errcode != arg_in_range) { 3085 jio_fprintf(defaultStream::error_stream(), 3086 "Invalid thread stack size: %s\n", option->optionString); 3087 describe_range_error(errcode); 3088 return JNI_EINVAL; 3089 } 3090 // Internally track ThreadStackSize in units of 1024 bytes. 3091 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, 3092 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) { 3093 return JNI_EINVAL; 3094 } 3095 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs 3096 } else if (match_option(option, "-Xoss", &tail) || 3097 match_option(option, "-Xsqnopause") || 3098 match_option(option, "-Xoptimize") || 3099 match_option(option, "-Xboundthreads") || 3100 match_option(option, "-Xusealtsigs")) { 3101 // All these options are deprecated in JDK 9 and will be removed in a future release 3102 char version[256]; 3103 JDK_Version::jdk(9).to_string(version, sizeof(version)); 3104 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 3105 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 3106 julong long_CodeCacheExpansionSize = 0; 3107 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 3108 if (errcode != arg_in_range) { 3109 jio_fprintf(defaultStream::error_stream(), 3110 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 3111 os::vm_page_size()/K); 3112 return JNI_EINVAL; 3113 } 3114 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) { 3115 return JNI_EINVAL; 3116 } 3117 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 3118 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 3119 julong long_ReservedCodeCacheSize = 0; 3120 3121 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 3122 if (errcode != arg_in_range) { 3123 jio_fprintf(defaultStream::error_stream(), 3124 "Invalid maximum code cache size: %s.\n", option->optionString); 3125 return JNI_EINVAL; 3126 } 3127 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) { 3128 return JNI_EINVAL; 3129 } 3130 // -XX:NonNMethodCodeHeapSize= 3131 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 3132 julong long_NonNMethodCodeHeapSize = 0; 3133 3134 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 3135 if (errcode != arg_in_range) { 3136 jio_fprintf(defaultStream::error_stream(), 3137 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 3138 return JNI_EINVAL; 3139 } 3140 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) { 3141 return JNI_EINVAL; 3142 } 3143 // -XX:ProfiledCodeHeapSize= 3144 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 3145 julong long_ProfiledCodeHeapSize = 0; 3146 3147 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 3148 if (errcode != arg_in_range) { 3149 jio_fprintf(defaultStream::error_stream(), 3150 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 3151 return JNI_EINVAL; 3152 } 3153 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) { 3154 return JNI_EINVAL; 3155 } 3156 // -XX:NonProfiledCodeHeapSizee= 3157 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 3158 julong long_NonProfiledCodeHeapSize = 0; 3159 3160 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 3161 if (errcode != arg_in_range) { 3162 jio_fprintf(defaultStream::error_stream(), 3163 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 3164 return JNI_EINVAL; 3165 } 3166 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) { 3167 return JNI_EINVAL; 3168 } 3169 // -green 3170 } else if (match_option(option, "-green")) { 3171 jio_fprintf(defaultStream::error_stream(), 3172 "Green threads support not available\n"); 3173 return JNI_EINVAL; 3174 // -native 3175 } else if (match_option(option, "-native")) { 3176 // HotSpot always uses native threads, ignore silently for compatibility 3177 // -Xrs 3178 } else if (match_option(option, "-Xrs")) { 3179 // Classic/EVM option, new functionality 3180 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) { 3181 return JNI_EINVAL; 3182 } 3183 // -Xprof 3184 } else if (match_option(option, "-Xprof")) { 3185#if INCLUDE_FPROF 3186 log_warning(arguments)("Option -Xprof was deprecated in version 9 and will likely be removed in a future release."); 3187 _has_profile = true; 3188#else // INCLUDE_FPROF 3189 jio_fprintf(defaultStream::error_stream(), 3190 "Flat profiling is not supported in this VM.\n"); 3191 return JNI_ERR; 3192#endif // INCLUDE_FPROF 3193 // -Xconcurrentio 3194 } else if (match_option(option, "-Xconcurrentio")) { 3195 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) { 3196 return JNI_EINVAL; 3197 } 3198 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 3199 return JNI_EINVAL; 3200 } 3201 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) { 3202 return JNI_EINVAL; 3203 } 3204 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) { 3205 return JNI_EINVAL; 3206 } 3207 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation 3208 return JNI_EINVAL; 3209 } 3210 3211 // -Xinternalversion 3212 } else if (match_option(option, "-Xinternalversion")) { 3213 jio_fprintf(defaultStream::output_stream(), "%s\n", 3214 VM_Version::internal_vm_info_string()); 3215 vm_exit(0); 3216#ifndef PRODUCT 3217 // -Xprintflags 3218 } else if (match_option(option, "-Xprintflags")) { 3219 CommandLineFlags::printFlags(tty, false); 3220 vm_exit(0); 3221#endif 3222 // -D 3223 } else if (match_option(option, "-D", &tail)) { 3224 const char* value; 3225 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 3226 *value!= '\0' && strcmp(value, "\"\"") != 0) { 3227 // abort if -Djava.endorsed.dirs is set 3228 jio_fprintf(defaultStream::output_stream(), 3229 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 3230 "in modular form will be supported via the concept of upgradeable modules.\n", value); 3231 return JNI_EINVAL; 3232 } 3233 if (match_option(option, "-Djava.ext.dirs=", &value) && 3234 *value != '\0' && strcmp(value, "\"\"") != 0) { 3235 // abort if -Djava.ext.dirs is set 3236 jio_fprintf(defaultStream::output_stream(), 3237 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 3238 return JNI_EINVAL; 3239 } 3240 // Check for module related properties. They must be set using the modules 3241 // options. For example: use "--add-modules=java.sql", not 3242 // "-Djdk.module.addmods=java.sql" 3243 if (is_internal_module_property(option->optionString + 2)) { 3244 needs_module_property_warning = true; 3245 continue; 3246 } 3247 3248 if (!add_property(tail)) { 3249 return JNI_ENOMEM; 3250 } 3251 // Out of the box management support 3252 if (match_option(option, "-Dcom.sun.management", &tail)) { 3253#if INCLUDE_MANAGEMENT 3254 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) { 3255 return JNI_EINVAL; 3256 } 3257 // management agent in module jdk.management.agent 3258 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 3259 return JNI_ENOMEM; 3260 } 3261#else 3262 jio_fprintf(defaultStream::output_stream(), 3263 "-Dcom.sun.management is not supported in this VM.\n"); 3264 return JNI_ERR; 3265#endif 3266 } 3267 // -Xint 3268 } else if (match_option(option, "-Xint")) { 3269 set_mode_flags(_int); 3270 // -Xmixed 3271 } else if (match_option(option, "-Xmixed")) { 3272 set_mode_flags(_mixed); 3273 // -Xcomp 3274 } else if (match_option(option, "-Xcomp")) { 3275 // for testing the compiler; turn off all flags that inhibit compilation 3276 set_mode_flags(_comp); 3277 // -Xshare:dump 3278 } else if (match_option(option, "-Xshare:dump")) { 3279 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) { 3280 return JNI_EINVAL; 3281 } 3282 set_mode_flags(_int); // Prevent compilation, which creates objects 3283 // -Xshare:on 3284 } else if (match_option(option, "-Xshare:on")) { 3285 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3286 return JNI_EINVAL; 3287 } 3288 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3289 return JNI_EINVAL; 3290 } 3291 // -Xshare:auto 3292 } else if (match_option(option, "-Xshare:auto")) { 3293 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3294 return JNI_EINVAL; 3295 } 3296 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3297 return JNI_EINVAL; 3298 } 3299 // -Xshare:off 3300 } else if (match_option(option, "-Xshare:off")) { 3301 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) { 3302 return JNI_EINVAL; 3303 } 3304 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3305 return JNI_EINVAL; 3306 } 3307 // -Xverify 3308 } else if (match_option(option, "-Xverify", &tail)) { 3309 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3310 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) { 3311 return JNI_EINVAL; 3312 } 3313 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3314 return JNI_EINVAL; 3315 } 3316 } else if (strcmp(tail, ":remote") == 0) { 3317 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3318 return JNI_EINVAL; 3319 } 3320 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3321 return JNI_EINVAL; 3322 } 3323 } else if (strcmp(tail, ":none") == 0) { 3324 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3325 return JNI_EINVAL; 3326 } 3327 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) { 3328 return JNI_EINVAL; 3329 } 3330 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3331 return JNI_EINVAL; 3332 } 3333 // -Xdebug 3334 } else if (match_option(option, "-Xdebug")) { 3335 // note this flag has been used, then ignore 3336 set_xdebug_mode(true); 3337 // -Xnoagent 3338 } else if (match_option(option, "-Xnoagent")) { 3339 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3340 } else if (match_option(option, "-Xloggc:", &tail)) { 3341 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 3342 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 3343 _gc_log_filename = os::strdup_check_oom(tail); 3344 } else if (match_option(option, "-Xlog", &tail)) { 3345 bool ret = false; 3346 if (strcmp(tail, ":help") == 0) { 3347 LogConfiguration::print_command_line_help(defaultStream::output_stream()); 3348 vm_exit(0); 3349 } else if (strcmp(tail, ":disable") == 0) { 3350 LogConfiguration::disable_logging(); 3351 ret = true; 3352 } else if (*tail == '\0') { 3353 ret = LogConfiguration::parse_command_line_arguments(); 3354 assert(ret, "-Xlog without arguments should never fail to parse"); 3355 } else if (*tail == ':') { 3356 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 3357 } 3358 if (ret == false) { 3359 jio_fprintf(defaultStream::error_stream(), 3360 "Invalid -Xlog option '-Xlog%s'\n", 3361 tail); 3362 return JNI_EINVAL; 3363 } 3364 // JNI hooks 3365 } else if (match_option(option, "-Xcheck", &tail)) { 3366 if (!strcmp(tail, ":jni")) { 3367#if !INCLUDE_JNI_CHECK 3368 warning("JNI CHECKING is not supported in this VM"); 3369#else 3370 CheckJNICalls = true; 3371#endif // INCLUDE_JNI_CHECK 3372 } else if (is_bad_option(option, args->ignoreUnrecognized, 3373 "check")) { 3374 return JNI_EINVAL; 3375 } 3376 } else if (match_option(option, "vfprintf")) { 3377 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3378 } else if (match_option(option, "exit")) { 3379 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3380 } else if (match_option(option, "abort")) { 3381 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3382 // -XX:+AggressiveHeap 3383 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3384 jint result = set_aggressive_heap_flags(); 3385 if (result != JNI_OK) { 3386 return result; 3387 } 3388 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3389 // and the last option wins. 3390 } else if (match_option(option, "-XX:+NeverTenure")) { 3391 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) { 3392 return JNI_EINVAL; 3393 } 3394 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3395 return JNI_EINVAL; 3396 } 3397 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) { 3398 return JNI_EINVAL; 3399 } 3400 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3401 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3402 return JNI_EINVAL; 3403 } 3404 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3405 return JNI_EINVAL; 3406 } 3407 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) { 3408 return JNI_EINVAL; 3409 } 3410 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3411 uintx max_tenuring_thresh = 0; 3412 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3413 jio_fprintf(defaultStream::error_stream(), 3414 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 3415 return JNI_EINVAL; 3416 } 3417 3418 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) { 3419 return JNI_EINVAL; 3420 } 3421 3422 if (MaxTenuringThreshold == 0) { 3423 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3424 return JNI_EINVAL; 3425 } 3426 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3427 return JNI_EINVAL; 3428 } 3429 } else { 3430 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3431 return JNI_EINVAL; 3432 } 3433 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3434 return JNI_EINVAL; 3435 } 3436 } 3437 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3438 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) { 3439 return JNI_EINVAL; 3440 } 3441 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) { 3442 return JNI_EINVAL; 3443 } 3444 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3445 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) { 3446 return JNI_EINVAL; 3447 } 3448 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) { 3449 return JNI_EINVAL; 3450 } 3451 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3452#if defined(DTRACE_ENABLED) 3453 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) { 3454 return JNI_EINVAL; 3455 } 3456 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) { 3457 return JNI_EINVAL; 3458 } 3459 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) { 3460 return JNI_EINVAL; 3461 } 3462 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) { 3463 return JNI_EINVAL; 3464 } 3465#else // defined(DTRACE_ENABLED) 3466 jio_fprintf(defaultStream::error_stream(), 3467 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3468 return JNI_EINVAL; 3469#endif // defined(DTRACE_ENABLED) 3470#ifdef ASSERT 3471 } else if (match_option(option, "-XX:+FullGCALot")) { 3472 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) { 3473 return JNI_EINVAL; 3474 } 3475 // disable scavenge before parallel mark-compact 3476 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 3477 return JNI_EINVAL; 3478 } 3479#endif 3480#if !INCLUDE_MANAGEMENT 3481 } else if (match_option(option, "-XX:+ManagementServer")) { 3482 jio_fprintf(defaultStream::error_stream(), 3483 "ManagementServer is not supported in this VM.\n"); 3484 return JNI_ERR; 3485#endif // INCLUDE_MANAGEMENT 3486 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3487 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 3488 // already been handled 3489 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 3490 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 3491 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3492 return JNI_EINVAL; 3493 } 3494 } 3495 // Unknown option 3496 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3497 return JNI_ERR; 3498 } 3499 } 3500 3501 // PrintSharedArchiveAndExit will turn on 3502 // -Xshare:on 3503 // -Xlog:class+path=info 3504 if (PrintSharedArchiveAndExit) { 3505 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3506 return JNI_EINVAL; 3507 } 3508 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3509 return JNI_EINVAL; 3510 } 3511 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 3512 } 3513 3514 // Change the default value for flags which have different default values 3515 // when working with older JDKs. 3516#ifdef LINUX 3517 if (JDK_Version::current().compare_major(6) <= 0 && 3518 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3519 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3520 } 3521#endif // LINUX 3522 fix_appclasspath(); 3523 return JNI_OK; 3524} 3525 3526void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 3527 // For java.base check for duplicate --patch-module options being specified on the command line. 3528 // This check is only required for java.base, all other duplicate module specifications 3529 // will be checked during module system initialization. The module system initialization 3530 // will throw an ExceptionInInitializerError if this situation occurs. 3531 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 3532 if (*patch_mod_javabase) { 3533 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 3534 } else { 3535 *patch_mod_javabase = true; 3536 } 3537 } 3538 3539 // Create GrowableArray lazily, only if --patch-module has been specified 3540 if (_patch_mod_prefix == NULL) { 3541 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true); 3542 } 3543 3544 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 3545} 3546 3547// Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3548// 3549// This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3550// in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3551// Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3552// path is treated as the current directory. 3553// 3554// This causes problems with CDS, which requires that all directories specified in the classpath 3555// must be empty. In most cases, applications do NOT want to load classes from the current 3556// directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3557// scripts compatible with CDS. 3558void Arguments::fix_appclasspath() { 3559 if (IgnoreEmptyClassPaths) { 3560 const char separator = *os::path_separator(); 3561 const char* src = _java_class_path->value(); 3562 3563 // skip over all the leading empty paths 3564 while (*src == separator) { 3565 src ++; 3566 } 3567 3568 char* copy = os::strdup_check_oom(src, mtArguments); 3569 3570 // trim all trailing empty paths 3571 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3572 *tail = '\0'; 3573 } 3574 3575 char from[3] = {separator, separator, '\0'}; 3576 char to [2] = {separator, '\0'}; 3577 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3578 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3579 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3580 } 3581 3582 _java_class_path->set_writeable_value(copy); 3583 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3584 } 3585} 3586 3587static bool has_jar_files(const char* directory) { 3588 DIR* dir = os::opendir(directory); 3589 if (dir == NULL) return false; 3590 3591 struct dirent *entry; 3592 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments); 3593 bool hasJarFile = false; 3594 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3595 const char* name = entry->d_name; 3596 const char* ext = name + strlen(name) - 4; 3597 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3598 } 3599 FREE_C_HEAP_ARRAY(char, dbuf); 3600 os::closedir(dir); 3601 return hasJarFile ; 3602} 3603 3604static int check_non_empty_dirs(const char* path) { 3605 const char separator = *os::path_separator(); 3606 const char* const end = path + strlen(path); 3607 int nonEmptyDirs = 0; 3608 while (path < end) { 3609 const char* tmp_end = strchr(path, separator); 3610 if (tmp_end == NULL) { 3611 if (has_jar_files(path)) { 3612 nonEmptyDirs++; 3613 jio_fprintf(defaultStream::output_stream(), 3614 "Non-empty directory: %s\n", path); 3615 } 3616 path = end; 3617 } else { 3618 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments); 3619 memcpy(dirpath, path, tmp_end - path); 3620 dirpath[tmp_end - path] = '\0'; 3621 if (has_jar_files(dirpath)) { 3622 nonEmptyDirs++; 3623 jio_fprintf(defaultStream::output_stream(), 3624 "Non-empty directory: %s\n", dirpath); 3625 } 3626 FREE_C_HEAP_ARRAY(char, dirpath); 3627 path = tmp_end + 1; 3628 } 3629 } 3630 return nonEmptyDirs; 3631} 3632 3633jint Arguments::finalize_vm_init_args() { 3634 // check if the default lib/endorsed directory exists; if so, error 3635 char path[JVM_MAXPATHLEN]; 3636 const char* fileSep = os::file_separator(); 3637 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3638 3639 if (CheckEndorsedAndExtDirs) { 3640 int nonEmptyDirs = 0; 3641 // check endorsed directory 3642 nonEmptyDirs += check_non_empty_dirs(path); 3643 // check the extension directories 3644 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3645 if (nonEmptyDirs > 0) { 3646 return JNI_ERR; 3647 } 3648 } 3649 3650 DIR* dir = os::opendir(path); 3651 if (dir != NULL) { 3652 jio_fprintf(defaultStream::output_stream(), 3653 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3654 "in modular form will be supported via the concept of upgradeable modules.\n"); 3655 os::closedir(dir); 3656 return JNI_ERR; 3657 } 3658 3659 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3660 dir = os::opendir(path); 3661 if (dir != NULL) { 3662 jio_fprintf(defaultStream::output_stream(), 3663 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3664 "Use -classpath instead.\n."); 3665 os::closedir(dir); 3666 return JNI_ERR; 3667 } 3668 3669 // This must be done after all arguments have been processed. 3670 // java_compiler() true means set to "NONE" or empty. 3671 if (java_compiler() && !xdebug_mode()) { 3672 // For backwards compatibility, we switch to interpreted mode if 3673 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3674 // not specified. 3675 set_mode_flags(_int); 3676 } 3677 3678 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3679 // but like -Xint, leave compilation thresholds unaffected. 3680 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3681 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3682 set_mode_flags(_int); 3683 } 3684 3685 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3686 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3687 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3688 } 3689 3690#if !defined(COMPILER2) && !INCLUDE_JVMCI 3691 // Don't degrade server performance for footprint 3692 if (FLAG_IS_DEFAULT(UseLargePages) && 3693 MaxHeapSize < LargePageHeapSizeThreshold) { 3694 // No need for large granularity pages w/small heaps. 3695 // Note that large pages are enabled/disabled for both the 3696 // Java heap and the code cache. 3697 FLAG_SET_DEFAULT(UseLargePages, false); 3698 } 3699 3700#elif defined(COMPILER2) 3701 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3702 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3703 } 3704#endif 3705 3706#if !defined(COMPILER2) && !INCLUDE_JVMCI 3707 UNSUPPORTED_OPTION(ProfileInterpreter); 3708 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter)); 3709#endif 3710 3711#ifndef TIERED 3712 // Tiered compilation is undefined. 3713 UNSUPPORTED_OPTION(TieredCompilation); 3714#endif 3715 3716#if INCLUDE_JVMCI 3717 if (EnableJVMCI && 3718 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 3719 return JNI_ENOMEM; 3720 } 3721#endif 3722 3723 // If we are running in a headless jre, force java.awt.headless property 3724 // to be true unless the property has already been set. 3725 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3726 if (os::is_headless_jre()) { 3727 const char* headless = Arguments::get_property("java.awt.headless"); 3728 if (headless == NULL) { 3729 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3730 if (headless_env == NULL) { 3731 if (!add_property("java.awt.headless=true")) { 3732 return JNI_ENOMEM; 3733 } 3734 } else { 3735 char buffer[256]; 3736 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env); 3737 if (!add_property(buffer)) { 3738 return JNI_ENOMEM; 3739 } 3740 } 3741 } 3742 } 3743 3744 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) { 3745 // CMS can only be used with ParNew 3746 FLAG_SET_ERGO(bool, UseParNewGC, true); 3747 } 3748 3749 if (!check_vm_args_consistency()) { 3750 return JNI_ERR; 3751 } 3752 3753#if INCLUDE_JVMCI 3754 if (UseJVMCICompiler) { 3755 Compilation_mode = CompMode_server; 3756 } 3757#endif 3758 3759 return JNI_OK; 3760} 3761 3762// Helper class for controlling the lifetime of JavaVMInitArgs 3763// objects. The contents of the JavaVMInitArgs are guaranteed to be 3764// deleted on the destruction of the ScopedVMInitArgs object. 3765class ScopedVMInitArgs : public StackObj { 3766 private: 3767 JavaVMInitArgs _args; 3768 char* _container_name; 3769 bool _is_set; 3770 char* _vm_options_file_arg; 3771 3772 public: 3773 ScopedVMInitArgs(const char *container_name) { 3774 _args.version = JNI_VERSION_1_2; 3775 _args.nOptions = 0; 3776 _args.options = NULL; 3777 _args.ignoreUnrecognized = false; 3778 _container_name = (char *)container_name; 3779 _is_set = false; 3780 _vm_options_file_arg = NULL; 3781 } 3782 3783 // Populates the JavaVMInitArgs object represented by this 3784 // ScopedVMInitArgs object with the arguments in options. The 3785 // allocated memory is deleted by the destructor. If this method 3786 // returns anything other than JNI_OK, then this object is in a 3787 // partially constructed state, and should be abandoned. 3788 jint set_args(GrowableArray<JavaVMOption>* options) { 3789 _is_set = true; 3790 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3791 JavaVMOption, options->length(), mtArguments); 3792 if (options_arr == NULL) { 3793 return JNI_ENOMEM; 3794 } 3795 _args.options = options_arr; 3796 3797 for (int i = 0; i < options->length(); i++) { 3798 options_arr[i] = options->at(i); 3799 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3800 if (options_arr[i].optionString == NULL) { 3801 // Rely on the destructor to do cleanup. 3802 _args.nOptions = i; 3803 return JNI_ENOMEM; 3804 } 3805 } 3806 3807 _args.nOptions = options->length(); 3808 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3809 return JNI_OK; 3810 } 3811 3812 JavaVMInitArgs* get() { return &_args; } 3813 char* container_name() { return _container_name; } 3814 bool is_set() { return _is_set; } 3815 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3816 char* vm_options_file_arg() { return _vm_options_file_arg; } 3817 3818 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3819 if (_vm_options_file_arg != NULL) { 3820 os::free(_vm_options_file_arg); 3821 } 3822 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3823 } 3824 3825 ~ScopedVMInitArgs() { 3826 if (_vm_options_file_arg != NULL) { 3827 os::free(_vm_options_file_arg); 3828 } 3829 if (_args.options == NULL) return; 3830 for (int i = 0; i < _args.nOptions; i++) { 3831 os::free(_args.options[i].optionString); 3832 } 3833 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3834 } 3835 3836 // Insert options into this option list, to replace option at 3837 // vm_options_file_pos (-XX:VMOptionsFile) 3838 jint insert(const JavaVMInitArgs* args, 3839 const JavaVMInitArgs* args_to_insert, 3840 const int vm_options_file_pos) { 3841 assert(_args.options == NULL, "shouldn't be set yet"); 3842 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3843 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3844 3845 int length = args->nOptions + args_to_insert->nOptions - 1; 3846 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) 3847 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3848 for (int i = 0; i < args->nOptions; i++) { 3849 if (i == vm_options_file_pos) { 3850 // insert the new options starting at the same place as the 3851 // -XX:VMOptionsFile option 3852 for (int j = 0; j < args_to_insert->nOptions; j++) { 3853 options->push(args_to_insert->options[j]); 3854 } 3855 } else { 3856 options->push(args->options[i]); 3857 } 3858 } 3859 // make into options array 3860 jint result = set_args(options); 3861 delete options; 3862 return result; 3863 } 3864}; 3865 3866jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3867 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3868} 3869 3870jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3871 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3872} 3873 3874jint Arguments::parse_options_environment_variable(const char* name, 3875 ScopedVMInitArgs* vm_args) { 3876 char *buffer = ::getenv(name); 3877 3878 // Don't check this environment variable if user has special privileges 3879 // (e.g. unix su command). 3880 if (buffer == NULL || os::have_special_privileges()) { 3881 return JNI_OK; 3882 } 3883 3884 if ((buffer = os::strdup(buffer)) == NULL) { 3885 return JNI_ENOMEM; 3886 } 3887 3888 jio_fprintf(defaultStream::error_stream(), 3889 "Picked up %s: %s\n", name, buffer); 3890 3891 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3892 3893 os::free(buffer); 3894 return retcode; 3895} 3896 3897jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3898 // read file into buffer 3899 int fd = ::open(file_name, O_RDONLY); 3900 if (fd < 0) { 3901 jio_fprintf(defaultStream::error_stream(), 3902 "Could not open options file '%s'\n", 3903 file_name); 3904 return JNI_ERR; 3905 } 3906 3907 struct stat stbuf; 3908 int retcode = os::stat(file_name, &stbuf); 3909 if (retcode != 0) { 3910 jio_fprintf(defaultStream::error_stream(), 3911 "Could not stat options file '%s'\n", 3912 file_name); 3913 os::close(fd); 3914 return JNI_ERR; 3915 } 3916 3917 if (stbuf.st_size == 0) { 3918 // tell caller there is no option data and that is ok 3919 os::close(fd); 3920 return JNI_OK; 3921 } 3922 3923 // '+ 1' for NULL termination even with max bytes 3924 size_t bytes_alloc = stbuf.st_size + 1; 3925 3926 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3927 if (NULL == buf) { 3928 jio_fprintf(defaultStream::error_stream(), 3929 "Could not allocate read buffer for options file parse\n"); 3930 os::close(fd); 3931 return JNI_ENOMEM; 3932 } 3933 3934 memset(buf, 0, bytes_alloc); 3935 3936 // Fill buffer 3937 // Use ::read() instead of os::read because os::read() 3938 // might do a thread state transition 3939 // and it is too early for that here 3940 3941 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3942 os::close(fd); 3943 if (bytes_read < 0) { 3944 FREE_C_HEAP_ARRAY(char, buf); 3945 jio_fprintf(defaultStream::error_stream(), 3946 "Could not read options file '%s'\n", file_name); 3947 return JNI_ERR; 3948 } 3949 3950 if (bytes_read == 0) { 3951 // tell caller there is no option data and that is ok 3952 FREE_C_HEAP_ARRAY(char, buf); 3953 return JNI_OK; 3954 } 3955 3956 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3957 3958 FREE_C_HEAP_ARRAY(char, buf); 3959 return retcode; 3960} 3961 3962jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3963 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array 3964 3965 // some pointers to help with parsing 3966 char *buffer_end = buffer + buf_len; 3967 char *opt_hd = buffer; 3968 char *wrt = buffer; 3969 char *rd = buffer; 3970 3971 // parse all options 3972 while (rd < buffer_end) { 3973 // skip leading white space from the input string 3974 while (rd < buffer_end && isspace(*rd)) { 3975 rd++; 3976 } 3977 3978 if (rd >= buffer_end) { 3979 break; 3980 } 3981 3982 // Remember this is where we found the head of the token. 3983 opt_hd = wrt; 3984 3985 // Tokens are strings of non white space characters separated 3986 // by one or more white spaces. 3987 while (rd < buffer_end && !isspace(*rd)) { 3988 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3989 int quote = *rd; // matching quote to look for 3990 rd++; // don't copy open quote 3991 while (rd < buffer_end && *rd != quote) { 3992 // include everything (even spaces) 3993 // up until the close quote 3994 *wrt++ = *rd++; // copy to option string 3995 } 3996 3997 if (rd < buffer_end) { 3998 rd++; // don't copy close quote 3999 } else { 4000 // did not see closing quote 4001 jio_fprintf(defaultStream::error_stream(), 4002 "Unmatched quote in %s\n", name); 4003 delete options; 4004 return JNI_ERR; 4005 } 4006 } else { 4007 *wrt++ = *rd++; // copy to option string 4008 } 4009 } 4010 4011 // steal a white space character and set it to NULL 4012 *wrt++ = '\0'; 4013 // We now have a complete token 4014 4015 JavaVMOption option; 4016 option.optionString = opt_hd; 4017 option.extraInfo = NULL; 4018 4019 options->append(option); // Fill in option 4020 4021 rd++; // Advance to next character 4022 } 4023 4024 // Fill out JavaVMInitArgs structure. 4025 jint status = vm_args->set_args(options); 4026 4027 delete options; 4028 return status; 4029} 4030 4031void Arguments::set_shared_spaces_flags() { 4032 if (DumpSharedSpaces) { 4033 if (FailOverToOldVerifier) { 4034 // Don't fall back to the old verifier on verification failure. If a 4035 // class fails verification with the split verifier, it might fail the 4036 // CDS runtime verifier constraint check. In that case, we don't want 4037 // to share the class. We only archive classes that pass the split verifier. 4038 FLAG_SET_DEFAULT(FailOverToOldVerifier, false); 4039 } 4040 4041 if (RequireSharedSpaces) { 4042 warning("Cannot dump shared archive while using shared archive"); 4043 } 4044 UseSharedSpaces = false; 4045#ifdef _LP64 4046 if (!UseCompressedOops || !UseCompressedClassPointers) { 4047 vm_exit_during_initialization( 4048 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 4049 } 4050 } else { 4051 if (!UseCompressedOops || !UseCompressedClassPointers) { 4052 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 4053 } 4054#endif 4055 } 4056} 4057 4058// Sharing support 4059// Construct the path to the archive 4060static char* get_shared_archive_path() { 4061 char *shared_archive_path; 4062 if (SharedArchiveFile == NULL) { 4063 char jvm_path[JVM_MAXPATHLEN]; 4064 os::jvm_path(jvm_path, sizeof(jvm_path)); 4065 char *end = strrchr(jvm_path, *os::file_separator()); 4066 if (end != NULL) *end = '\0'; 4067 size_t jvm_path_len = strlen(jvm_path); 4068 size_t file_sep_len = strlen(os::file_separator()); 4069 const size_t len = jvm_path_len + file_sep_len + 20; 4070 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 4071 if (shared_archive_path != NULL) { 4072 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 4073 jvm_path, os::file_separator()); 4074 } 4075 } else { 4076 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments); 4077 } 4078 return shared_archive_path; 4079} 4080 4081#ifndef PRODUCT 4082// Determine whether LogVMOutput should be implicitly turned on. 4083static bool use_vm_log() { 4084 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 4085 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 4086 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 4087 PrintAssembly || TraceDeoptimization || TraceDependencies || 4088 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 4089 return true; 4090 } 4091 4092#ifdef COMPILER1 4093 if (PrintC1Statistics) { 4094 return true; 4095 } 4096#endif // COMPILER1 4097 4098#ifdef COMPILER2 4099 if (PrintOptoAssembly || PrintOptoStatistics) { 4100 return true; 4101 } 4102#endif // COMPILER2 4103 4104 return false; 4105} 4106 4107#endif // PRODUCT 4108 4109bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 4110 for (int index = 0; index < args->nOptions; index++) { 4111 const JavaVMOption* option = args->options + index; 4112 const char* tail; 4113 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4114 return true; 4115 } 4116 } 4117 return false; 4118} 4119 4120jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 4121 const char* vm_options_file, 4122 const int vm_options_file_pos, 4123 ScopedVMInitArgs* vm_options_file_args, 4124 ScopedVMInitArgs* args_out) { 4125 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 4126 if (code != JNI_OK) { 4127 return code; 4128 } 4129 4130 if (vm_options_file_args->get()->nOptions < 1) { 4131 return JNI_OK; 4132 } 4133 4134 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 4135 jio_fprintf(defaultStream::error_stream(), 4136 "A VM options file may not refer to a VM options file. " 4137 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 4138 "options file '%s' in options container '%s' is an error.\n", 4139 vm_options_file_args->vm_options_file_arg(), 4140 vm_options_file_args->container_name()); 4141 return JNI_EINVAL; 4142 } 4143 4144 return args_out->insert(args, vm_options_file_args->get(), 4145 vm_options_file_pos); 4146} 4147 4148// Expand -XX:VMOptionsFile found in args_in as needed. 4149// mod_args and args_out parameters may return values as needed. 4150jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 4151 ScopedVMInitArgs* mod_args, 4152 JavaVMInitArgs** args_out) { 4153 jint code = match_special_option_and_act(args_in, mod_args); 4154 if (code != JNI_OK) { 4155 return code; 4156 } 4157 4158 if (mod_args->is_set()) { 4159 // args_in contains -XX:VMOptionsFile and mod_args contains the 4160 // original options from args_in along with the options expanded 4161 // from the VMOptionsFile. Return a short-hand to the caller. 4162 *args_out = mod_args->get(); 4163 } else { 4164 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 4165 } 4166 return JNI_OK; 4167} 4168 4169jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 4170 ScopedVMInitArgs* args_out) { 4171 // Remaining part of option string 4172 const char* tail; 4173 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 4174 4175 for (int index = 0; index < args->nOptions; index++) { 4176 const JavaVMOption* option = args->options + index; 4177 if (ArgumentsExt::process_options(option)) { 4178 continue; 4179 } 4180 if (match_option(option, "-XX:Flags=", &tail)) { 4181 Arguments::set_jvm_flags_file(tail); 4182 continue; 4183 } 4184 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4185 if (vm_options_file_args.found_vm_options_file_arg()) { 4186 jio_fprintf(defaultStream::error_stream(), 4187 "The option '%s' is already specified in the options " 4188 "container '%s' so the specification of '%s' in the " 4189 "same options container is an error.\n", 4190 vm_options_file_args.vm_options_file_arg(), 4191 vm_options_file_args.container_name(), 4192 option->optionString); 4193 return JNI_EINVAL; 4194 } 4195 vm_options_file_args.set_vm_options_file_arg(option->optionString); 4196 // If there's a VMOptionsFile, parse that 4197 jint code = insert_vm_options_file(args, tail, index, 4198 &vm_options_file_args, args_out); 4199 if (code != JNI_OK) { 4200 return code; 4201 } 4202 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 4203 if (args_out->is_set()) { 4204 // The VMOptions file inserted some options so switch 'args' 4205 // to the new set of options, and continue processing which 4206 // preserves "last option wins" semantics. 4207 args = args_out->get(); 4208 // The first option from the VMOptionsFile replaces the 4209 // current option. So we back track to process the 4210 // replacement option. 4211 index--; 4212 } 4213 continue; 4214 } 4215 if (match_option(option, "-XX:+PrintVMOptions")) { 4216 PrintVMOptions = true; 4217 continue; 4218 } 4219 if (match_option(option, "-XX:-PrintVMOptions")) { 4220 PrintVMOptions = false; 4221 continue; 4222 } 4223 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 4224 IgnoreUnrecognizedVMOptions = true; 4225 continue; 4226 } 4227 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 4228 IgnoreUnrecognizedVMOptions = false; 4229 continue; 4230 } 4231 if (match_option(option, "-XX:+PrintFlagsInitial")) { 4232 CommandLineFlags::printFlags(tty, false); 4233 vm_exit(0); 4234 } 4235 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 4236#if INCLUDE_NMT 4237 // The launcher did not setup nmt environment variable properly. 4238 if (!MemTracker::check_launcher_nmt_support(tail)) { 4239 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 4240 } 4241 4242 // Verify if nmt option is valid. 4243 if (MemTracker::verify_nmt_option()) { 4244 // Late initialization, still in single-threaded mode. 4245 if (MemTracker::tracking_level() >= NMT_summary) { 4246 MemTracker::init(); 4247 } 4248 } else { 4249 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 4250 } 4251 continue; 4252#else 4253 jio_fprintf(defaultStream::error_stream(), 4254 "Native Memory Tracking is not supported in this VM\n"); 4255 return JNI_ERR; 4256#endif 4257 } 4258 4259#ifndef PRODUCT 4260 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 4261 CommandLineFlags::printFlags(tty, true); 4262 vm_exit(0); 4263 } 4264#endif 4265 } 4266 return JNI_OK; 4267} 4268 4269static void print_options(const JavaVMInitArgs *args) { 4270 const char* tail; 4271 for (int index = 0; index < args->nOptions; index++) { 4272 const JavaVMOption *option = args->options + index; 4273 if (match_option(option, "-XX:", &tail)) { 4274 logOption(tail); 4275 } 4276 } 4277} 4278 4279bool Arguments::handle_deprecated_print_gc_flags() { 4280 if (PrintGC) { 4281 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 4282 } 4283 if (PrintGCDetails) { 4284 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 4285 } 4286 4287 if (_gc_log_filename != NULL) { 4288 // -Xloggc was used to specify a filename 4289 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 4290 4291 LogTarget(Error, logging) target; 4292 LogStreamCHeap errstream(target); 4293 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream); 4294 } else if (PrintGC || PrintGCDetails) { 4295 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 4296 } 4297 return true; 4298} 4299 4300void Arguments::handle_extra_cms_flags(const char* msg) { 4301 SpecialFlag flag; 4302 const char *flag_name = "UseConcMarkSweepGC"; 4303 if (lookup_special_flag(flag_name, flag)) { 4304 handle_aliases_and_deprecation(flag_name, /* print warning */ true); 4305 warning("%s", msg); 4306 } 4307} 4308 4309// Parse entry point called from JNI_CreateJavaVM 4310 4311jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 4312 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 4313 4314 // Initialize ranges, constraints and writeables 4315 CommandLineFlagRangeList::init(); 4316 CommandLineFlagConstraintList::init(); 4317 CommandLineFlagWriteableList::init(); 4318 4319 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 4320 const char* hotspotrc = ".hotspotrc"; 4321 bool settings_file_specified = false; 4322 bool needs_hotspotrc_warning = false; 4323 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4324 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 4325 4326 // Pointers to current working set of containers 4327 JavaVMInitArgs* cur_cmd_args; 4328 JavaVMInitArgs* cur_java_options_args; 4329 JavaVMInitArgs* cur_java_tool_options_args; 4330 4331 // Containers for modified/expanded options 4332 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 4333 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4334 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 4335 4336 4337 jint code = 4338 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 4339 if (code != JNI_OK) { 4340 return code; 4341 } 4342 4343 code = parse_java_options_environment_variable(&initial_java_options_args); 4344 if (code != JNI_OK) { 4345 return code; 4346 } 4347 4348 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 4349 &mod_java_tool_options_args, 4350 &cur_java_tool_options_args); 4351 if (code != JNI_OK) { 4352 return code; 4353 } 4354 4355 code = expand_vm_options_as_needed(initial_cmd_args, 4356 &mod_cmd_args, 4357 &cur_cmd_args); 4358 if (code != JNI_OK) { 4359 return code; 4360 } 4361 4362 code = expand_vm_options_as_needed(initial_java_options_args.get(), 4363 &mod_java_options_args, 4364 &cur_java_options_args); 4365 if (code != JNI_OK) { 4366 return code; 4367 } 4368 4369 const char* flags_file = Arguments::get_jvm_flags_file(); 4370 settings_file_specified = (flags_file != NULL); 4371 4372 if (IgnoreUnrecognizedVMOptions) { 4373 cur_cmd_args->ignoreUnrecognized = true; 4374 cur_java_tool_options_args->ignoreUnrecognized = true; 4375 cur_java_options_args->ignoreUnrecognized = true; 4376 } 4377 4378 // Parse specified settings file 4379 if (settings_file_specified) { 4380 if (!process_settings_file(flags_file, true, 4381 cur_cmd_args->ignoreUnrecognized)) { 4382 return JNI_EINVAL; 4383 } 4384 } else { 4385#ifdef ASSERT 4386 // Parse default .hotspotrc settings file 4387 if (!process_settings_file(".hotspotrc", false, 4388 cur_cmd_args->ignoreUnrecognized)) { 4389 return JNI_EINVAL; 4390 } 4391#else 4392 struct stat buf; 4393 if (os::stat(hotspotrc, &buf) == 0) { 4394 needs_hotspotrc_warning = true; 4395 } 4396#endif 4397 } 4398 4399 if (PrintVMOptions) { 4400 print_options(cur_java_tool_options_args); 4401 print_options(cur_cmd_args); 4402 print_options(cur_java_options_args); 4403 } 4404 4405 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 4406 jint result = parse_vm_init_args(cur_java_tool_options_args, 4407 cur_java_options_args, 4408 cur_cmd_args); 4409 4410 if (result != JNI_OK) { 4411 return result; 4412 } 4413 4414 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 4415 SharedArchivePath = get_shared_archive_path(); 4416 if (SharedArchivePath == NULL) { 4417 return JNI_ENOMEM; 4418 } 4419 4420 // Set up VerifySharedSpaces 4421 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 4422 VerifySharedSpaces = true; 4423 } 4424 4425 // Delay warning until here so that we've had a chance to process 4426 // the -XX:-PrintWarnings flag 4427 if (needs_hotspotrc_warning) { 4428 warning("%s file is present but has been ignored. " 4429 "Run with -XX:Flags=%s to load the file.", 4430 hotspotrc, hotspotrc); 4431 } 4432 4433 if (needs_module_property_warning) { 4434 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 4435 " names that are reserved for internal use."); 4436 } 4437 4438#if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 4439 UNSUPPORTED_OPTION(UseLargePages); 4440#endif 4441 4442 ArgumentsExt::report_unsupported_options(); 4443 4444#ifndef PRODUCT 4445 if (TraceBytecodesAt != 0) { 4446 TraceBytecodes = true; 4447 } 4448 if (CountCompiledCalls) { 4449 if (UseCounterDecay) { 4450 warning("UseCounterDecay disabled because CountCalls is set"); 4451 UseCounterDecay = false; 4452 } 4453 } 4454#endif // PRODUCT 4455 4456 if (ScavengeRootsInCode == 0) { 4457 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4458 warning("Forcing ScavengeRootsInCode non-zero"); 4459 } 4460 ScavengeRootsInCode = 1; 4461 } 4462 4463 if (!handle_deprecated_print_gc_flags()) { 4464 return JNI_EINVAL; 4465 } 4466 4467 // Set object alignment values. 4468 set_object_alignment(); 4469 4470#if !INCLUDE_CDS 4471 if (DumpSharedSpaces || RequireSharedSpaces) { 4472 jio_fprintf(defaultStream::error_stream(), 4473 "Shared spaces are not supported in this VM\n"); 4474 return JNI_ERR; 4475 } 4476 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 4477 warning("Shared spaces are not supported in this VM"); 4478 FLAG_SET_DEFAULT(UseSharedSpaces, false); 4479 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 4480 } 4481 no_shared_spaces("CDS Disabled"); 4482#endif // INCLUDE_CDS 4483 4484 return JNI_OK; 4485} 4486 4487jint Arguments::apply_ergo() { 4488 // Set flags based on ergonomics. 4489 set_ergonomics_flags(); 4490 4491#if INCLUDE_JVMCI 4492 set_jvmci_specific_flags(); 4493#endif 4494 4495 set_shared_spaces_flags(); 4496 4497 // Check the GC selections again. 4498 if (!check_gc_consistency()) { 4499 return JNI_EINVAL; 4500 } 4501 4502 if (TieredCompilation) { 4503 set_tiered_flags(); 4504 } else { 4505 int max_compilation_policy_choice = 1; 4506#ifdef COMPILER2 4507 if (is_server_compilation_mode_vm()) { 4508 max_compilation_policy_choice = 2; 4509 } 4510#endif 4511 // Check if the policy is valid. 4512 if (CompilationPolicyChoice >= max_compilation_policy_choice) { 4513 vm_exit_during_initialization( 4514 "Incompatible compilation policy selected", NULL); 4515 } 4516 // Scale CompileThreshold 4517 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 4518 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 4519 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 4520 } 4521 } 4522 4523#ifdef COMPILER2 4524#ifndef PRODUCT 4525 if (PrintIdealGraphLevel > 0) { 4526 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 4527 } 4528#endif 4529#endif 4530 4531 // Set heap size based on available physical memory 4532 set_heap_size(); 4533 4534 ArgumentsExt::set_gc_specific_flags(); 4535 4536 // Initialize Metaspace flags and alignments 4537 Metaspace::ergo_initialize(); 4538 4539 // Set bytecode rewriting flags 4540 set_bytecode_flags(); 4541 4542 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 4543 jint code = set_aggressive_opts_flags(); 4544 if (code != JNI_OK) { 4545 return code; 4546 } 4547 4548 // Turn off biased locking for locking debug mode flags, 4549 // which are subtly different from each other but neither works with 4550 // biased locking 4551 if (UseHeavyMonitors 4552#ifdef COMPILER1 4553 || !UseFastLocking 4554#endif // COMPILER1 4555#if INCLUDE_JVMCI 4556 || !JVMCIUseFastLocking 4557#endif 4558 ) { 4559 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4560 // flag set to true on command line; warn the user that they 4561 // can't enable biased locking here 4562 warning("Biased Locking is not supported with locking debug flags" 4563 "; ignoring UseBiasedLocking flag." ); 4564 } 4565 UseBiasedLocking = false; 4566 } 4567 4568#ifdef CC_INTERP 4569 // Clear flags not supported on zero. 4570 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4571 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4572 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4573 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4574#endif // CC_INTERP 4575 4576#ifdef COMPILER2 4577 if (!EliminateLocks) { 4578 EliminateNestedLocks = false; 4579 } 4580 if (!Inline) { 4581 IncrementalInline = false; 4582 } 4583#ifndef PRODUCT 4584 if (!IncrementalInline) { 4585 AlwaysIncrementalInline = false; 4586 } 4587#endif 4588 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 4589 // nothing to use the profiling, turn if off 4590 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 4591 } 4592#endif 4593 4594 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4595 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4596 DebugNonSafepoints = true; 4597 } 4598 4599 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4600 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4601 } 4602 4603 if (UseOnStackReplacement && !UseLoopCounter) { 4604 warning("On-stack-replacement requires loop counters; enabling loop counters"); 4605 FLAG_SET_DEFAULT(UseLoopCounter, true); 4606 } 4607 4608#ifndef PRODUCT 4609 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4610 if (use_vm_log()) { 4611 LogVMOutput = true; 4612 } 4613 } 4614#endif // PRODUCT 4615 4616 if (PrintCommandLineFlags) { 4617 CommandLineFlags::printSetFlags(tty); 4618 } 4619 4620 // Apply CPU specific policy for the BiasedLocking 4621 if (UseBiasedLocking) { 4622 if (!VM_Version::use_biased_locking() && 4623 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4624 UseBiasedLocking = false; 4625 } 4626 } 4627#ifdef COMPILER2 4628 if (!UseBiasedLocking || EmitSync != 0) { 4629 UseOptoBiasInlining = false; 4630 } 4631#endif 4632 4633 return JNI_OK; 4634} 4635 4636jint Arguments::adjust_after_os() { 4637 if (UseNUMA) { 4638 if (UseParallelGC || UseParallelOldGC) { 4639 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4640 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4641 } 4642 } 4643 // UseNUMAInterleaving is set to ON for all collectors and 4644 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4645 // such as the parallel collector for Linux and Solaris will 4646 // interleave old gen and survivor spaces on top of NUMA 4647 // allocation policy for the eden space. 4648 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4649 // all platforms and ParallelGC on Windows will interleave all 4650 // of the heap spaces across NUMA nodes. 4651 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4652 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4653 } 4654 } 4655 return JNI_OK; 4656} 4657 4658int Arguments::PropertyList_count(SystemProperty* pl) { 4659 int count = 0; 4660 while(pl != NULL) { 4661 count++; 4662 pl = pl->next(); 4663 } 4664 return count; 4665} 4666 4667// Return the number of readable properties. 4668int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4669 int count = 0; 4670 while(pl != NULL) { 4671 if (pl->is_readable()) { 4672 count++; 4673 } 4674 pl = pl->next(); 4675 } 4676 return count; 4677} 4678 4679const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4680 assert(key != NULL, "just checking"); 4681 SystemProperty* prop; 4682 for (prop = pl; prop != NULL; prop = prop->next()) { 4683 if (strcmp(key, prop->key()) == 0) return prop->value(); 4684 } 4685 return NULL; 4686} 4687 4688// Return the value of the requested property provided that it is a readable property. 4689const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4690 assert(key != NULL, "just checking"); 4691 SystemProperty* prop; 4692 // Return the property value if the keys match and the property is not internal or 4693 // it's the special internal property "jdk.boot.class.path.append". 4694 for (prop = pl; prop != NULL; prop = prop->next()) { 4695 if (strcmp(key, prop->key()) == 0) { 4696 if (!prop->internal()) { 4697 return prop->value(); 4698 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4699 return prop->value(); 4700 } else { 4701 // Property is internal and not jdk.boot.class.path.append so return NULL. 4702 return NULL; 4703 } 4704 } 4705 } 4706 return NULL; 4707} 4708 4709const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4710 int count = 0; 4711 const char* ret_val = NULL; 4712 4713 while(pl != NULL) { 4714 if(count >= index) { 4715 ret_val = pl->key(); 4716 break; 4717 } 4718 count++; 4719 pl = pl->next(); 4720 } 4721 4722 return ret_val; 4723} 4724 4725char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4726 int count = 0; 4727 char* ret_val = NULL; 4728 4729 while(pl != NULL) { 4730 if(count >= index) { 4731 ret_val = pl->value(); 4732 break; 4733 } 4734 count++; 4735 pl = pl->next(); 4736 } 4737 4738 return ret_val; 4739} 4740 4741void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4742 SystemProperty* p = *plist; 4743 if (p == NULL) { 4744 *plist = new_p; 4745 } else { 4746 while (p->next() != NULL) { 4747 p = p->next(); 4748 } 4749 p->set_next(new_p); 4750 } 4751} 4752 4753void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4754 bool writeable, bool internal) { 4755 if (plist == NULL) 4756 return; 4757 4758 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4759 PropertyList_add(plist, new_p); 4760} 4761 4762void Arguments::PropertyList_add(SystemProperty *element) { 4763 PropertyList_add(&_system_properties, element); 4764} 4765 4766// This add maintains unique property key in the list. 4767void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4768 PropertyAppendable append, PropertyWriteable writeable, 4769 PropertyInternal internal) { 4770 if (plist == NULL) 4771 return; 4772 4773 // If property key exist then update with new value. 4774 SystemProperty* prop; 4775 for (prop = *plist; prop != NULL; prop = prop->next()) { 4776 if (strcmp(k, prop->key()) == 0) { 4777 if (append == AppendProperty) { 4778 prop->append_value(v); 4779 } else { 4780 prop->set_value(v); 4781 } 4782 return; 4783 } 4784 } 4785 4786 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4787} 4788 4789// Copies src into buf, replacing "%%" with "%" and "%p" with pid 4790// Returns true if all of the source pointed by src has been copied over to 4791// the destination buffer pointed by buf. Otherwise, returns false. 4792// Notes: 4793// 1. If the length (buflen) of the destination buffer excluding the 4794// NULL terminator character is not long enough for holding the expanded 4795// pid characters, it also returns false instead of returning the partially 4796// expanded one. 4797// 2. The passed in "buflen" should be large enough to hold the null terminator. 4798bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4799 char* buf, size_t buflen) { 4800 const char* p = src; 4801 char* b = buf; 4802 const char* src_end = &src[srclen]; 4803 char* buf_end = &buf[buflen - 1]; 4804 4805 while (p < src_end && b < buf_end) { 4806 if (*p == '%') { 4807 switch (*(++p)) { 4808 case '%': // "%%" ==> "%" 4809 *b++ = *p++; 4810 break; 4811 case 'p': { // "%p" ==> current process id 4812 // buf_end points to the character before the last character so 4813 // that we could write '\0' to the end of the buffer. 4814 size_t buf_sz = buf_end - b + 1; 4815 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4816 4817 // if jio_snprintf fails or the buffer is not long enough to hold 4818 // the expanded pid, returns false. 4819 if (ret < 0 || ret >= (int)buf_sz) { 4820 return false; 4821 } else { 4822 b += ret; 4823 assert(*b == '\0', "fail in copy_expand_pid"); 4824 if (p == src_end && b == buf_end + 1) { 4825 // reach the end of the buffer. 4826 return true; 4827 } 4828 } 4829 p++; 4830 break; 4831 } 4832 default : 4833 *b++ = '%'; 4834 } 4835 } else { 4836 *b++ = *p++; 4837 } 4838 } 4839 *b = '\0'; 4840 return (p == src_end); // return false if not all of the source was copied 4841} 4842