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