arguments.cpp revision 8032:e6d2d68ed87f
175597Ssobomax/* 275597Ssobomax * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 375597Ssobomax * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 475597Ssobomax * 575597Ssobomax * This code is free software; you can redistribute it and/or modify it 675597Ssobomax * under the terms of the GNU General Public License version 2 only, as 775597Ssobomax * published by the Free Software Foundation. 875597Ssobomax * 975597Ssobomax * This code is distributed in the hope that it will be useful, but WITHOUT 1075597Ssobomax * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1175597Ssobomax * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1275597Ssobomax * version 2 for more details (a copy is included in the LICENSE file that 1375597Ssobomax * accompanied this code). 1475597Ssobomax * 1575597Ssobomax * You should have received a copy of the GNU General Public License version 1675597Ssobomax * 2 along with this work; if not, write to the Free Software Foundation, 1775597Ssobomax * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 1875597Ssobomax * 1975597Ssobomax * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 2075597Ssobomax * or visit www.oracle.com if you need additional information or have any 2175597Ssobomax * questions. 2275597Ssobomax * 2375597Ssobomax */ 2475597Ssobomax 2575597Ssobomax#include "precompiled.hpp" 2675597Ssobomax#include "classfile/classLoader.hpp" 2775597Ssobomax#include "classfile/javaAssertions.hpp" 2875597Ssobomax#include "classfile/stringTable.hpp" 2975597Ssobomax#include "classfile/symbolTable.hpp" 3086366Ssobomax#include "compiler/compilerOracle.hpp" 3186366Ssobomax#include "memory/allocation.inline.hpp" 3275597Ssobomax#include "memory/cardTableRS.hpp" 3375597Ssobomax#include "memory/genCollectedHeap.hpp" 3475597Ssobomax#include "memory/referenceProcessor.hpp" 3575597Ssobomax#include "memory/universe.inline.hpp" 3675597Ssobomax#include "oops/oop.inline.hpp" 3775597Ssobomax#include "prims/jvmtiExport.hpp" 3875597Ssobomax#include "runtime/arguments.hpp" 3975597Ssobomax#include "runtime/arguments_ext.hpp" 4075597Ssobomax#include "runtime/globals_extension.hpp" 4175597Ssobomax#include "runtime/java.hpp" 4275597Ssobomax#include "runtime/os.hpp" 4375597Ssobomax#include "runtime/vm_version.hpp" 4475597Ssobomax#include "services/management.hpp" 4575597Ssobomax#include "services/memTracker.hpp" 4675597Ssobomax#include "utilities/defaultStream.hpp" 4775597Ssobomax#include "utilities/macros.hpp" 4875597Ssobomax#include "utilities/stringUtils.hpp" 4975597Ssobomax#include "utilities/taskqueue.hpp" 5075597Ssobomax#if INCLUDE_ALL_GCS 5175597Ssobomax#include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 5275597Ssobomax#include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 5375597Ssobomax#include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 5475597Ssobomax#endif // INCLUDE_ALL_GCS 5575597Ssobomax 5675597Ssobomax// Note: This is a special bug reporting site for the JVM 5775597Ssobomax#define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 5875597Ssobomax#define DEFAULT_JAVA_LAUNCHER "generic" 5986366Ssobomax 6075597Ssobomax#define UNSUPPORTED_GC_OPTION(gc) \ 6186366Ssobomaxdo { \ 6275597Ssobomax if (gc) { \ 6375597Ssobomax if (FLAG_IS_CMDLINE(gc)) { \ 6475597Ssobomax warning(#gc " is not supported in this VM. Using Serial GC."); \ 6575597Ssobomax } \ 6675597Ssobomax FLAG_SET_DEFAULT(gc, false); \ 6775597Ssobomax } \ 6875597Ssobomax} while(0) 6975597Ssobomax 7075597Ssobomaxchar** Arguments::_jvm_flags_array = NULL; 7186366Ssobomaxint Arguments::_num_jvm_flags = 0; 7275597Ssobomaxchar** Arguments::_jvm_args_array = NULL; 7375597Ssobomaxint Arguments::_num_jvm_args = 0; 7475597Ssobomaxchar* Arguments::_java_command = NULL; 7575597SsobomaxSystemProperty* Arguments::_system_properties = NULL; 7675597Ssobomaxconst char* Arguments::_gc_log_filename = NULL; 7775597Ssobomaxbool Arguments::_has_profile = false; 7875597Ssobomaxsize_t Arguments::_conservative_max_heap_alignment = 0; 7975597Ssobomaxsize_t Arguments::_min_heap_size = 0; 8075597Ssobomaxuintx Arguments::_min_heap_free_ratio = 0; 8175597Ssobomaxuintx Arguments::_max_heap_free_ratio = 0; 8275597SsobomaxArguments::Mode Arguments::_mode = _mixed; 8375597Ssobomaxbool Arguments::_java_compiler = false; 8475597Ssobomaxbool Arguments::_xdebug_mode = false; 8575597Ssobomaxconst char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 8675597Ssobomaxconst char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 8775597Ssobomaxint Arguments::_sun_java_launcher_pid = -1; 8875597Ssobomaxbool Arguments::_sun_java_launcher_is_altjvm = false; 8975597Ssobomax 9075597Ssobomax// These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 9175597Ssobomaxbool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 9275597Ssobomaxbool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 9375597Ssobomaxbool Arguments::_BackgroundCompilation = BackgroundCompilation; 9475597Ssobomaxbool Arguments::_ClipInlining = ClipInlining; 9575597Ssobomax 9675597Ssobomaxchar* Arguments::SharedArchivePath = NULL; 9775597Ssobomax 9875597SsobomaxAgentLibraryList Arguments::_libraryList; 9975597SsobomaxAgentLibraryList Arguments::_agentList; 10075597Ssobomax 10175597Ssobomaxabort_hook_t Arguments::_abort_hook = NULL; 10275597Ssobomaxexit_hook_t Arguments::_exit_hook = NULL; 10375597Ssobomaxvfprintf_hook_t Arguments::_vfprintf_hook = NULL; 10475597Ssobomax 10575597Ssobomax 10675597SsobomaxSystemProperty *Arguments::_sun_boot_library_path = NULL; 10775597SsobomaxSystemProperty *Arguments::_java_library_path = NULL; 10875597SsobomaxSystemProperty *Arguments::_java_home = NULL; 10975597SsobomaxSystemProperty *Arguments::_java_class_path = NULL; 11075597SsobomaxSystemProperty *Arguments::_sun_boot_class_path = NULL; 11175597Ssobomax 11275597Ssobomaxchar* Arguments::_ext_dirs = NULL; 11375597Ssobomax 11475597Ssobomax// Check if head of 'option' matches 'name', and sets 'tail' to the remaining 11575597Ssobomax// part of the option string. 11675597Ssobomaxstatic bool match_option(const JavaVMOption *option, const char* name, 11775597Ssobomax const char** tail) { 11875597Ssobomax int len = (int)strlen(name); 11975597Ssobomax if (strncmp(option->optionString, name, len) == 0) { 12075597Ssobomax *tail = option->optionString + len; 12175597Ssobomax return true; 12275597Ssobomax } else { 12375597Ssobomax return false; 12475597Ssobomax } 12575597Ssobomax} 12675597Ssobomax 12775597Ssobomax// Check if 'option' matches 'name'. No "tail" is allowed. 12875597Ssobomaxstatic bool match_option(const JavaVMOption *option, const char* name) { 12975597Ssobomax const char* tail = NULL; 13075597Ssobomax bool result = match_option(option, name, &tail); 13175597Ssobomax if (tail != NULL && *tail == '\0') { 13275597Ssobomax return result; 13375597Ssobomax } else { 13475597Ssobomax return false; 13575597Ssobomax } 13675597Ssobomax} 13775597Ssobomax 13875597Ssobomax// Return true if any of the strings in null-terminated array 'names' matches. 13975597Ssobomax// If tail_allowed is true, then the tail must begin with a colon; otherwise, 14075597Ssobomax// the option must match exactly. 14175597Ssobomaxstatic bool match_option(const JavaVMOption* option, const char** names, const char** tail, 14275597Ssobomax bool tail_allowed) { 14375597Ssobomax for (/* empty */; *names != NULL; ++names) { 14475597Ssobomax if (match_option(option, *names, tail)) { 14575597Ssobomax if (**tail == '\0' || tail_allowed && **tail == ':') { 14675597Ssobomax return true; 14775597Ssobomax } 14875597Ssobomax } 14975597Ssobomax } 15075597Ssobomax return false; 15175597Ssobomax} 15275597Ssobomax 15375597Ssobomaxstatic void logOption(const char* opt) { 15475597Ssobomax if (PrintVMOptions) { 15575597Ssobomax jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 15675597Ssobomax } 15775597Ssobomax} 15886366Ssobomax 15986366Ssobomax// Process java launcher properties. 16075597Ssobomaxvoid Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 16175597Ssobomax // See if sun.java.launcher, sun.java.launcher.is_altjvm or 16275597Ssobomax // sun.java.launcher.pid is defined. 16375597Ssobomax // Must do this before setting up other system properties, 16475597Ssobomax // as some of them may depend on launcher type. 16575597Ssobomax for (int index = 0; index < args->nOptions; index++) { 16675597Ssobomax const JavaVMOption* option = args->options + index; 16775597Ssobomax const char* tail; 16875597Ssobomax 16975597Ssobomax if (match_option(option, "-Dsun.java.launcher=", &tail)) { 17075597Ssobomax process_java_launcher_argument(tail, option->extraInfo); 17175597Ssobomax continue; 17275597Ssobomax } 17375597Ssobomax if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 17475597Ssobomax if (strcmp(tail, "true") == 0) { 17575597Ssobomax _sun_java_launcher_is_altjvm = true; 17675597Ssobomax } 17775597Ssobomax continue; 17875597Ssobomax } 17975597Ssobomax if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 18075597Ssobomax _sun_java_launcher_pid = atoi(tail); 18175597Ssobomax continue; 18275597Ssobomax } 18375597Ssobomax } 18475597Ssobomax} 18575597Ssobomax 18675597Ssobomax// Initialize system properties key and value. 18786366Ssobomaxvoid Arguments::init_system_properties() { 18875597Ssobomax 18986366Ssobomax PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 19075597Ssobomax "Java Virtual Machine Specification", false)); 19175597Ssobomax PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 19275597Ssobomax PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 19375597Ssobomax PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 19475597Ssobomax 19575597Ssobomax // Following are JVMTI agent writable properties. 19675597Ssobomax // Properties values are set to NULL and they are 19775597Ssobomax // os specific they are initialized in os::init_system_properties_values(). 19875597Ssobomax _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 19986366Ssobomax _java_library_path = new SystemProperty("java.library.path", NULL, true); 20075597Ssobomax _java_home = new SystemProperty("java.home", NULL, true); 20175597Ssobomax _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 20275597Ssobomax 20375597Ssobomax _java_class_path = new SystemProperty("java.class.path", "", true); 20475597Ssobomax 20575597Ssobomax // Add to System Property list. 20675597Ssobomax PropertyList_add(&_system_properties, _sun_boot_library_path); 20775597Ssobomax PropertyList_add(&_system_properties, _java_library_path); 20875597Ssobomax PropertyList_add(&_system_properties, _java_home); 20975597Ssobomax PropertyList_add(&_system_properties, _java_class_path); 21075597Ssobomax PropertyList_add(&_system_properties, _sun_boot_class_path); 21175597Ssobomax 21275597Ssobomax // Set OS specific system properties values 21375597Ssobomax os::init_system_properties_values(); 21475597Ssobomax} 21575597Ssobomax 21675597Ssobomax 21775597Ssobomax // Update/Initialize System properties after JDK version number is known 21875597Ssobomaxvoid Arguments::init_version_specific_system_properties() { 21975597Ssobomax enum { bufsz = 16 }; 22075597Ssobomax char buffer[bufsz]; 22175597Ssobomax const char* spec_vendor = "Sun Microsystems Inc."; 22275597Ssobomax uint32_t spec_version = 0; 22375597Ssobomax 22475597Ssobomax spec_vendor = "Oracle Corporation"; 22575597Ssobomax spec_version = JDK_Version::current().major_version(); 22675597Ssobomax jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 22775597Ssobomax 22875597Ssobomax PropertyList_add(&_system_properties, 22975597Ssobomax new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 23075597Ssobomax PropertyList_add(&_system_properties, 23175597Ssobomax new SystemProperty("java.vm.specification.version", buffer, false)); 23275597Ssobomax PropertyList_add(&_system_properties, 23375597Ssobomax new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 23475597Ssobomax} 23575597Ssobomax 23675597Ssobomax/** 23775597Ssobomax * Provide a slightly more user-friendly way of eliminating -XX flags. 23875597Ssobomax * When a flag is eliminated, it can be added to this list in order to 23975597Ssobomax * continue accepting this flag on the command-line, while issuing a warning 24075597Ssobomax * and ignoring the value. Once the JDK version reaches the 'accept_until' 24175597Ssobomax * limit, we flatly refuse to admit the existence of the flag. This allows 24275597Ssobomax * a flag to die correctly over JDK releases using HSX. 24375597Ssobomax */ 24475597Ssobomaxtypedef struct { 24575597Ssobomax const char* name; 24675597Ssobomax JDK_Version obsoleted_in; // when the flag went away 24775597Ssobomax JDK_Version accept_until; // which version to start denying the existence 24875597Ssobomax} ObsoleteFlag; 24975597Ssobomax 25075597Ssobomaxstatic ObsoleteFlag obsolete_jvm_flags[] = { 25175597Ssobomax { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 25275597Ssobomax { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 25375597Ssobomax { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 25475597Ssobomax { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 255 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 256 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 257 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 258 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 259 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 260 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 261 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 262 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 263 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 264 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 265 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 266 { "DefaultInitialRAMFraction", 267 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 268 { "UseDepthFirstScavengeOrder", 269 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 270 { "HandlePromotionFailure", 271 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 272 { "MaxLiveObjectEvacuationRatio", 273 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 274 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 275 { "UseParallelOldGCCompacting", 276 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 277 { "UseParallelDensePrefixUpdate", 278 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 279 { "UseParallelOldGCDensePrefix", 280 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 281 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 282 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 283 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 284 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 285 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 286 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 287 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 288 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 289 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 290 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 291 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 292 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 293 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 294 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 295 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 296 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 297 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 298 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 299 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 300 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 301 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 302 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 303#ifdef PRODUCT 304 { "DesiredMethodLimit", 305 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 306#endif // PRODUCT 307 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 308 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 309 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 310 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 311 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 312 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 313 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) }, 314 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 315 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 316 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 317 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 318 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 319#ifndef ZERO 320 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 321 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 322#endif // ZERO 323 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 324 { "AdaptiveSizePausePolicy", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 325 { "ParallelGCRetainPLAB", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 326 { NULL, JDK_Version(0), JDK_Version(0) } 327}; 328 329// Returns true if the flag is obsolete and fits into the range specified 330// for being ignored. In the case that the flag is ignored, the 'version' 331// value is filled in with the version number when the flag became 332// obsolete so that that value can be displayed to the user. 333bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 334 int i = 0; 335 assert(version != NULL, "Must provide a version buffer"); 336 while (obsolete_jvm_flags[i].name != NULL) { 337 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 338 // <flag>=xxx form 339 // [-|+]<flag> form 340 size_t len = strlen(flag_status.name); 341 if (((strncmp(flag_status.name, s, len) == 0) && 342 (strlen(s) == len)) || 343 ((s[0] == '+' || s[0] == '-') && 344 (strncmp(flag_status.name, &s[1], len) == 0) && 345 (strlen(&s[1]) == len))) { 346 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 347 *version = flag_status.obsoleted_in; 348 return true; 349 } 350 } 351 i++; 352 } 353 return false; 354} 355 356// Constructs the system class path (aka boot class path) from the following 357// components, in order: 358// 359// prefix // from -Xbootclasspath/p:... 360// base // from os::get_system_properties() or -Xbootclasspath= 361// suffix // from -Xbootclasspath/a:... 362// 363// This could be AllStatic, but it isn't needed after argument processing is 364// complete. 365class SysClassPath: public StackObj { 366public: 367 SysClassPath(const char* base); 368 ~SysClassPath(); 369 370 inline void set_base(const char* base); 371 inline void add_prefix(const char* prefix); 372 inline void add_suffix_to_prefix(const char* suffix); 373 inline void add_suffix(const char* suffix); 374 inline void reset_path(const char* base); 375 376 inline const char* get_base() const { return _items[_scp_base]; } 377 inline const char* get_prefix() const { return _items[_scp_prefix]; } 378 inline const char* get_suffix() const { return _items[_scp_suffix]; } 379 380 // Combine all the components into a single c-heap-allocated string; caller 381 // must free the string if/when no longer needed. 382 char* combined_path(); 383 384private: 385 // Utility routines. 386 static char* add_to_path(const char* path, const char* str, bool prepend); 387 static char* add_jars_to_path(char* path, const char* directory); 388 389 inline void reset_item_at(int index); 390 391 // Array indices for the items that make up the sysclasspath. All except the 392 // base are allocated in the C heap and freed by this class. 393 enum { 394 _scp_prefix, // from -Xbootclasspath/p:... 395 _scp_base, // the default sysclasspath 396 _scp_suffix, // from -Xbootclasspath/a:... 397 _scp_nitems // the number of items, must be last. 398 }; 399 400 const char* _items[_scp_nitems]; 401}; 402 403SysClassPath::SysClassPath(const char* base) { 404 memset(_items, 0, sizeof(_items)); 405 _items[_scp_base] = base; 406} 407 408SysClassPath::~SysClassPath() { 409 // Free everything except the base. 410 for (int i = 0; i < _scp_nitems; ++i) { 411 if (i != _scp_base) reset_item_at(i); 412 } 413} 414 415inline void SysClassPath::set_base(const char* base) { 416 _items[_scp_base] = base; 417} 418 419inline void SysClassPath::add_prefix(const char* prefix) { 420 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 421} 422 423inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 424 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 425} 426 427inline void SysClassPath::add_suffix(const char* suffix) { 428 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 429} 430 431inline void SysClassPath::reset_item_at(int index) { 432 assert(index < _scp_nitems && index != _scp_base, "just checking"); 433 if (_items[index] != NULL) { 434 FREE_C_HEAP_ARRAY(char, _items[index]); 435 _items[index] = NULL; 436 } 437} 438 439inline void SysClassPath::reset_path(const char* base) { 440 // Clear the prefix and suffix. 441 reset_item_at(_scp_prefix); 442 reset_item_at(_scp_suffix); 443 set_base(base); 444} 445 446//------------------------------------------------------------------------------ 447 448 449// Combine the bootclasspath elements, some of which may be null, into a single 450// c-heap-allocated string. 451char* SysClassPath::combined_path() { 452 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 453 454 size_t lengths[_scp_nitems]; 455 size_t total_len = 0; 456 457 const char separator = *os::path_separator(); 458 459 // Get the lengths. 460 int i; 461 for (i = 0; i < _scp_nitems; ++i) { 462 if (_items[i] != NULL) { 463 lengths[i] = strlen(_items[i]); 464 // Include space for the separator char (or a NULL for the last item). 465 total_len += lengths[i] + 1; 466 } 467 } 468 assert(total_len > 0, "empty sysclasspath not allowed"); 469 470 // Copy the _items to a single string. 471 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 472 char* cp_tmp = cp; 473 for (i = 0; i < _scp_nitems; ++i) { 474 if (_items[i] != NULL) { 475 memcpy(cp_tmp, _items[i], lengths[i]); 476 cp_tmp += lengths[i]; 477 *cp_tmp++ = separator; 478 } 479 } 480 *--cp_tmp = '\0'; // Replace the extra separator. 481 return cp; 482} 483 484// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 485char* 486SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 487 char *cp; 488 489 assert(str != NULL, "just checking"); 490 if (path == NULL) { 491 size_t len = strlen(str) + 1; 492 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 493 memcpy(cp, str, len); // copy the trailing null 494 } else { 495 const char separator = *os::path_separator(); 496 size_t old_len = strlen(path); 497 size_t str_len = strlen(str); 498 size_t len = old_len + str_len + 2; 499 500 if (prepend) { 501 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 502 char* cp_tmp = cp; 503 memcpy(cp_tmp, str, str_len); 504 cp_tmp += str_len; 505 *cp_tmp = separator; 506 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 507 FREE_C_HEAP_ARRAY(char, path); 508 } else { 509 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 510 char* cp_tmp = cp + old_len; 511 *cp_tmp = separator; 512 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 513 } 514 } 515 return cp; 516} 517 518// Scan the directory and append any jar or zip files found to path. 519// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 520char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 521 DIR* dir = os::opendir(directory); 522 if (dir == NULL) return path; 523 524 char dir_sep[2] = { '\0', '\0' }; 525 size_t directory_len = strlen(directory); 526 const char fileSep = *os::file_separator(); 527 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 528 529 /* Scan the directory for jars/zips, appending them to path. */ 530 struct dirent *entry; 531 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 532 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 533 const char* name = entry->d_name; 534 const char* ext = name + strlen(name) - 4; 535 bool isJarOrZip = ext > name && 536 (os::file_name_strcmp(ext, ".jar") == 0 || 537 os::file_name_strcmp(ext, ".zip") == 0); 538 if (isJarOrZip) { 539 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 540 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 541 path = add_to_path(path, jarpath, false); 542 FREE_C_HEAP_ARRAY(char, jarpath); 543 } 544 } 545 FREE_C_HEAP_ARRAY(char, dbuf); 546 os::closedir(dir); 547 return path; 548} 549 550// Parses a memory size specification string. 551static bool atomull(const char *s, julong* result) { 552 julong n = 0; 553 int args_read = 0; 554 bool is_hex = false; 555 // Skip leading 0[xX] for hexadecimal 556 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) { 557 s += 2; 558 is_hex = true; 559 args_read = sscanf(s, JULONG_FORMAT_X, &n); 560 } else { 561 args_read = sscanf(s, JULONG_FORMAT, &n); 562 } 563 if (args_read != 1) { 564 return false; 565 } 566 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) { 567 s++; 568 } 569 // 4705540: illegal if more characters are found after the first non-digit 570 if (strlen(s) > 1) { 571 return false; 572 } 573 switch (*s) { 574 case 'T': case 't': 575 *result = n * G * K; 576 // Check for overflow. 577 if (*result/((julong)G * K) != n) return false; 578 return true; 579 case 'G': case 'g': 580 *result = n * G; 581 if (*result/G != n) return false; 582 return true; 583 case 'M': case 'm': 584 *result = n * M; 585 if (*result/M != n) return false; 586 return true; 587 case 'K': case 'k': 588 *result = n * K; 589 if (*result/K != n) return false; 590 return true; 591 case '\0': 592 *result = n; 593 return true; 594 default: 595 return false; 596 } 597} 598 599Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 600 if (size < min_size) return arg_too_small; 601 // Check that size will fit in a size_t (only relevant on 32-bit) 602 if (size > max_uintx) return arg_too_big; 603 return arg_in_range; 604} 605 606// Describe an argument out of range error 607void Arguments::describe_range_error(ArgsRange errcode) { 608 switch(errcode) { 609 case arg_too_big: 610 jio_fprintf(defaultStream::error_stream(), 611 "The specified size exceeds the maximum " 612 "representable size.\n"); 613 break; 614 case arg_too_small: 615 case arg_unreadable: 616 case arg_in_range: 617 // do nothing for now 618 break; 619 default: 620 ShouldNotReachHere(); 621 } 622} 623 624static bool set_bool_flag(char* name, bool value, Flag::Flags origin) { 625 return CommandLineFlags::boolAtPut(name, &value, origin); 626} 627 628static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 629 double v; 630 if (sscanf(value, "%lf", &v) != 1) { 631 return false; 632 } 633 634 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 635 return true; 636 } 637 return false; 638} 639 640static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 641 julong v; 642 intx intx_v; 643 bool is_neg = false; 644 // Check the sign first since atomull() parses only unsigned values. 645 if (*value == '-') { 646 if (!CommandLineFlags::intxAt(name, &intx_v)) { 647 return false; 648 } 649 value++; 650 is_neg = true; 651 } 652 if (!atomull(value, &v)) { 653 return false; 654 } 655 intx_v = (intx) v; 656 if (is_neg) { 657 intx_v = -intx_v; 658 } 659 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 660 return true; 661 } 662 uintx uintx_v = (uintx) v; 663 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 664 return true; 665 } 666 uint64_t uint64_t_v = (uint64_t) v; 667 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 668 return true; 669 } 670 size_t size_t_v = (size_t) v; 671 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) { 672 return true; 673 } 674 return false; 675} 676 677static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 678 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 679 // Contract: CommandLineFlags always returns a pointer that needs freeing. 680 FREE_C_HEAP_ARRAY(char, value); 681 return true; 682} 683 684static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 685 const char* old_value = ""; 686 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 687 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 688 size_t new_len = strlen(new_value); 689 const char* value; 690 char* free_this_too = NULL; 691 if (old_len == 0) { 692 value = new_value; 693 } else if (new_len == 0) { 694 value = old_value; 695 } else { 696 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 697 // each new setting adds another LINE to the switch: 698 sprintf(buf, "%s\n%s", old_value, new_value); 699 value = buf; 700 free_this_too = buf; 701 } 702 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 703 // CommandLineFlags always returns a pointer that needs freeing. 704 FREE_C_HEAP_ARRAY(char, value); 705 if (free_this_too != NULL) { 706 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 707 FREE_C_HEAP_ARRAY(char, free_this_too); 708 } 709 return true; 710} 711 712bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 713 714 // range of acceptable characters spelled out for portability reasons 715#define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 716#define BUFLEN 255 717 char name[BUFLEN+1]; 718 char dummy; 719 720 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 721 return set_bool_flag(name, false, origin); 722 } 723 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 724 return set_bool_flag(name, true, origin); 725 } 726 727 char punct; 728 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 729 const char* value = strchr(arg, '=') + 1; 730 Flag* flag = Flag::find_flag(name, strlen(name)); 731 if (flag != NULL && flag->is_ccstr()) { 732 if (flag->ccstr_accumulates()) { 733 return append_to_string_flag(name, value, origin); 734 } else { 735 if (value[0] == '\0') { 736 value = NULL; 737 } 738 return set_string_flag(name, value, origin); 739 } 740 } 741 } 742 743 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 744 const char* value = strchr(arg, '=') + 1; 745 // -XX:Foo:=xxx will reset the string flag to the given value. 746 if (value[0] == '\0') { 747 value = NULL; 748 } 749 return set_string_flag(name, value, origin); 750 } 751 752#define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 753#define SIGNED_NUMBER_RANGE "[-0123456789]" 754#define NUMBER_RANGE "[0123456789]" 755 char value[BUFLEN + 1]; 756 char value2[BUFLEN + 1]; 757 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 758 // Looks like a floating-point number -- try again with more lenient format string 759 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 760 return set_fp_numeric_flag(name, value, origin); 761 } 762 } 763 764#define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 765 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 766 return set_numeric_flag(name, value, origin); 767 } 768 769 return false; 770} 771 772void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 773 assert(bldarray != NULL, "illegal argument"); 774 775 if (arg == NULL) { 776 return; 777 } 778 779 int new_count = *count + 1; 780 781 // expand the array and add arg to the last element 782 if (*bldarray == NULL) { 783 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 784 } else { 785 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 786 } 787 (*bldarray)[*count] = os::strdup_check_oom(arg); 788 *count = new_count; 789} 790 791void Arguments::build_jvm_args(const char* arg) { 792 add_string(&_jvm_args_array, &_num_jvm_args, arg); 793} 794 795void Arguments::build_jvm_flags(const char* arg) { 796 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 797} 798 799// utility function to return a string that concatenates all 800// strings in a given char** array 801const char* Arguments::build_resource_string(char** args, int count) { 802 if (args == NULL || count == 0) { 803 return NULL; 804 } 805 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 806 for (int i = 1; i < count; i++) { 807 length += strlen(args[i]) + 1; // add 1 for a space 808 } 809 char* s = NEW_RESOURCE_ARRAY(char, length); 810 strcpy(s, args[0]); 811 for (int j = 1; j < count; j++) { 812 strcat(s, " "); 813 strcat(s, args[j]); 814 } 815 return (const char*) s; 816} 817 818void Arguments::print_on(outputStream* st) { 819 st->print_cr("VM Arguments:"); 820 if (num_jvm_flags() > 0) { 821 st->print("jvm_flags: "); print_jvm_flags_on(st); 822 } 823 if (num_jvm_args() > 0) { 824 st->print("jvm_args: "); print_jvm_args_on(st); 825 } 826 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 827 if (_java_class_path != NULL) { 828 char* path = _java_class_path->value(); 829 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 830 } 831 st->print_cr("Launcher Type: %s", _sun_java_launcher); 832} 833 834void Arguments::print_jvm_flags_on(outputStream* st) { 835 if (_num_jvm_flags > 0) { 836 for (int i=0; i < _num_jvm_flags; i++) { 837 st->print("%s ", _jvm_flags_array[i]); 838 } 839 st->cr(); 840 } 841} 842 843void Arguments::print_jvm_args_on(outputStream* st) { 844 if (_num_jvm_args > 0) { 845 for (int i=0; i < _num_jvm_args; i++) { 846 st->print("%s ", _jvm_args_array[i]); 847 } 848 st->cr(); 849 } 850} 851 852bool Arguments::process_argument(const char* arg, 853 jboolean ignore_unrecognized, Flag::Flags origin) { 854 855 JDK_Version since = JDK_Version(); 856 857 if (parse_argument(arg, origin) || ignore_unrecognized) { 858 return true; 859 } 860 861 bool has_plus_minus = (*arg == '+' || *arg == '-'); 862 const char* const argname = has_plus_minus ? arg + 1 : arg; 863 if (is_newly_obsolete(arg, &since)) { 864 char version[256]; 865 since.to_string(version, sizeof(version)); 866 warning("ignoring option %s; support was removed in %s", argname, version); 867 return true; 868 } 869 870 // For locked flags, report a custom error message if available. 871 // Otherwise, report the standard unrecognized VM option. 872 873 size_t arg_len; 874 const char* equal_sign = strchr(argname, '='); 875 if (equal_sign == NULL) { 876 arg_len = strlen(argname); 877 } else { 878 arg_len = equal_sign - argname; 879 } 880 881 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 882 if (found_flag != NULL) { 883 char locked_message_buf[BUFLEN]; 884 found_flag->get_locked_message(locked_message_buf, BUFLEN); 885 if (strlen(locked_message_buf) == 0) { 886 if (found_flag->is_bool() && !has_plus_minus) { 887 jio_fprintf(defaultStream::error_stream(), 888 "Missing +/- setting for VM option '%s'\n", argname); 889 } else if (!found_flag->is_bool() && has_plus_minus) { 890 jio_fprintf(defaultStream::error_stream(), 891 "Unexpected +/- setting in VM option '%s'\n", argname); 892 } else { 893 jio_fprintf(defaultStream::error_stream(), 894 "Improperly specified VM option '%s'\n", argname); 895 } 896 } else { 897 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 898 } 899 } else { 900 jio_fprintf(defaultStream::error_stream(), 901 "Unrecognized VM option '%s'\n", argname); 902 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 903 if (fuzzy_matched != NULL) { 904 jio_fprintf(defaultStream::error_stream(), 905 "Did you mean '%s%s%s'? ", 906 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 907 fuzzy_matched->_name, 908 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 909 if (is_newly_obsolete(fuzzy_matched->_name, &since)) { 910 char version[256]; 911 since.to_string(version, sizeof(version)); 912 jio_fprintf(defaultStream::error_stream(), 913 "Warning: support for %s was removed in %s\n", 914 fuzzy_matched->_name, 915 version); 916 } 917 } 918 } 919 920 // allow for commandline "commenting out" options like -XX:#+Verbose 921 return arg[0] == '#'; 922} 923 924bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 925 FILE* stream = fopen(file_name, "rb"); 926 if (stream == NULL) { 927 if (should_exist) { 928 jio_fprintf(defaultStream::error_stream(), 929 "Could not open settings file %s\n", file_name); 930 return false; 931 } else { 932 return true; 933 } 934 } 935 936 char token[1024]; 937 int pos = 0; 938 939 bool in_white_space = true; 940 bool in_comment = false; 941 bool in_quote = false; 942 char quote_c = 0; 943 bool result = true; 944 945 int c = getc(stream); 946 while(c != EOF && pos < (int)(sizeof(token)-1)) { 947 if (in_white_space) { 948 if (in_comment) { 949 if (c == '\n') in_comment = false; 950 } else { 951 if (c == '#') in_comment = true; 952 else if (!isspace(c)) { 953 in_white_space = false; 954 token[pos++] = c; 955 } 956 } 957 } else { 958 if (c == '\n' || (!in_quote && isspace(c))) { 959 // token ends at newline, or at unquoted whitespace 960 // this allows a way to include spaces in string-valued options 961 token[pos] = '\0'; 962 logOption(token); 963 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 964 build_jvm_flags(token); 965 pos = 0; 966 in_white_space = true; 967 in_quote = false; 968 } else if (!in_quote && (c == '\'' || c == '"')) { 969 in_quote = true; 970 quote_c = c; 971 } else if (in_quote && (c == quote_c)) { 972 in_quote = false; 973 } else { 974 token[pos++] = c; 975 } 976 } 977 c = getc(stream); 978 } 979 if (pos > 0) { 980 token[pos] = '\0'; 981 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 982 build_jvm_flags(token); 983 } 984 fclose(stream); 985 return result; 986} 987 988//============================================================================================================= 989// Parsing of properties (-D) 990 991const char* Arguments::get_property(const char* key) { 992 return PropertyList_get_value(system_properties(), key); 993} 994 995bool Arguments::add_property(const char* prop) { 996 const char* eq = strchr(prop, '='); 997 char* key; 998 // ns must be static--its address may be stored in a SystemProperty object. 999 const static char ns[1] = {0}; 1000 char* value = (char *)ns; 1001 1002 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 1003 key = AllocateHeap(key_len + 1, mtInternal); 1004 strncpy(key, prop, key_len); 1005 key[key_len] = '\0'; 1006 1007 if (eq != NULL) { 1008 size_t value_len = strlen(prop) - key_len - 1; 1009 value = AllocateHeap(value_len + 1, mtInternal); 1010 strncpy(value, &prop[key_len + 1], value_len + 1); 1011 } 1012 1013 if (strcmp(key, "java.compiler") == 0) { 1014 process_java_compiler_argument(value); 1015 FreeHeap(key); 1016 if (eq != NULL) { 1017 FreeHeap(value); 1018 } 1019 return true; 1020 } else if (strcmp(key, "sun.java.command") == 0) { 1021 _java_command = value; 1022 1023 // Record value in Arguments, but let it get passed to Java. 1024 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1025 strcmp(key, "sun.java.launcher.pid") == 0) { 1026 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1027 // private and are processed in process_sun_java_launcher_properties(); 1028 // the sun.java.launcher property is passed on to the java application 1029 FreeHeap(key); 1030 if (eq != NULL) { 1031 FreeHeap(value); 1032 } 1033 return true; 1034 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1035 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1036 // its value without going through the property list or making a Java call. 1037 _java_vendor_url_bug = value; 1038 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1039 PropertyList_unique_add(&_system_properties, key, value, true); 1040 return true; 1041 } 1042 // Create new property and add at the end of the list 1043 PropertyList_unique_add(&_system_properties, key, value); 1044 return true; 1045} 1046 1047//=========================================================================================================== 1048// Setting int/mixed/comp mode flags 1049 1050void Arguments::set_mode_flags(Mode mode) { 1051 // Set up default values for all flags. 1052 // If you add a flag to any of the branches below, 1053 // add a default value for it here. 1054 set_java_compiler(false); 1055 _mode = mode; 1056 1057 // Ensure Agent_OnLoad has the correct initial values. 1058 // This may not be the final mode; mode may change later in onload phase. 1059 PropertyList_unique_add(&_system_properties, "java.vm.info", 1060 (char*)VM_Version::vm_info_string(), false); 1061 1062 UseInterpreter = true; 1063 UseCompiler = true; 1064 UseLoopCounter = true; 1065 1066 // Default values may be platform/compiler dependent - 1067 // use the saved values 1068 ClipInlining = Arguments::_ClipInlining; 1069 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1070 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1071 BackgroundCompilation = Arguments::_BackgroundCompilation; 1072 1073 // Change from defaults based on mode 1074 switch (mode) { 1075 default: 1076 ShouldNotReachHere(); 1077 break; 1078 case _int: 1079 UseCompiler = false; 1080 UseLoopCounter = false; 1081 AlwaysCompileLoopMethods = false; 1082 UseOnStackReplacement = false; 1083 break; 1084 case _mixed: 1085 // same as default 1086 break; 1087 case _comp: 1088 UseInterpreter = false; 1089 BackgroundCompilation = false; 1090 ClipInlining = false; 1091 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1092 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1093 // compile a level 4 (C2) and then continue executing it. 1094 if (TieredCompilation) { 1095 Tier3InvokeNotifyFreqLog = 0; 1096 Tier4InvocationThreshold = 0; 1097 } 1098 break; 1099 } 1100} 1101 1102#if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1103// Conflict: required to use shared spaces (-Xshare:on), but 1104// incompatible command line options were chosen. 1105 1106static void no_shared_spaces(const char* message) { 1107 if (RequireSharedSpaces) { 1108 jio_fprintf(defaultStream::error_stream(), 1109 "Class data sharing is inconsistent with other specified options.\n"); 1110 vm_exit_during_initialization("Unable to use shared archive.", message); 1111 } else { 1112 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1113 } 1114} 1115#endif 1116 1117// Returns threshold scaled with the value of scale. 1118// If scale < 0.0, threshold is returned without scaling. 1119intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1120 if (scale == 1.0 || scale < 0.0) { 1121 return threshold; 1122 } else { 1123 return (intx)(threshold * scale); 1124 } 1125} 1126 1127// Returns freq_log scaled with the value of scale. 1128// Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1129// If scale < 0.0, freq_log is returned without scaling. 1130intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1131 // Check if scaling is necessary or if negative value was specified. 1132 if (scale == 1.0 || scale < 0.0) { 1133 return freq_log; 1134 } 1135 // Check values to avoid calculating log2 of 0. 1136 if (scale == 0.0 || freq_log == 0) { 1137 return 0; 1138 } 1139 // Determine the maximum notification frequency value currently supported. 1140 // The largest mask value that the interpreter/C1 can handle is 1141 // of length InvocationCounter::number_of_count_bits. Mask values are always 1142 // one bit shorter then the value of the notification frequency. Set 1143 // max_freq_bits accordingly. 1144 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1145 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1146 if (scaled_freq == 0) { 1147 // Return 0 right away to avoid calculating log2 of 0. 1148 return 0; 1149 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1150 return max_freq_bits; 1151 } else { 1152 return log2_intptr(scaled_freq); 1153 } 1154} 1155 1156void Arguments::set_tiered_flags() { 1157 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1158 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1159 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1160 } 1161 if (CompilationPolicyChoice < 2) { 1162 vm_exit_during_initialization( 1163 "Incompatible compilation policy selected", NULL); 1164 } 1165 // Increase the code cache size - tiered compiles a lot more. 1166 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1167 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1168 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1169 } 1170 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1171 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1172 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1173 1174 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1175 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap) 1176 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) { 1177 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1178 } 1179 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) { 1180 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1181 } 1182 // Check consistency of code heap sizes 1183 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 1184 jio_fprintf(defaultStream::error_stream(), 1185 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 1186 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 1187 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 1188 vm_exit(1); 1189 } 1190 } 1191 } 1192 if (!UseInterpreter) { // -Xcomp 1193 Tier3InvokeNotifyFreqLog = 0; 1194 Tier4InvocationThreshold = 0; 1195 } 1196 1197 if (CompileThresholdScaling < 0) { 1198 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1199 } 1200 1201 // Scale tiered compilation thresholds. 1202 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1203 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1204 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1205 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1206 1207 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1208 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1209 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1210 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1211 1212 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1213 // once these thresholds become supported. 1214 1215 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1216 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1217 1218 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1219 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1220 1221 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1222 1223 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1224 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1225 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1226 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1227 } 1228} 1229 1230/** 1231 * Returns the minimum number of compiler threads needed to run the JVM. The following 1232 * configurations are possible. 1233 * 1234 * 1) The JVM is build using an interpreter only. As a result, the minimum number of 1235 * compiler threads is 0. 1236 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As 1237 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1. 1238 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However, 1239 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only 1240 * C1 can be used, so the minimum number of compiler threads is 1. 1241 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option 1242 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result, 1243 * the minimum number of compiler threads is 2. 1244 */ 1245int Arguments::get_min_number_of_compiler_threads() { 1246#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 1247 return 0; // case 1 1248#else 1249 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) { 1250 return 1; // case 2 or case 3 1251 } 1252 return 2; // case 4 (tiered) 1253#endif 1254} 1255 1256#if INCLUDE_ALL_GCS 1257static void disable_adaptive_size_policy(const char* collector_name) { 1258 if (UseAdaptiveSizePolicy) { 1259 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1260 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1261 collector_name); 1262 } 1263 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1264 } 1265} 1266 1267void Arguments::set_parnew_gc_flags() { 1268 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1269 "control point invariant"); 1270 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1271 assert(UseParNewGC, "ParNew should always be used with CMS"); 1272 1273 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1274 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1275 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1276 } else if (ParallelGCThreads == 0) { 1277 jio_fprintf(defaultStream::error_stream(), 1278 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1279 vm_exit(1); 1280 } 1281 1282 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1283 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1284 // we set them to 1024 and 1024. 1285 // See CR 6362902. 1286 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1287 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1288 } 1289 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1290 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1291 } 1292 1293 // When using compressed oops, we use local overflow stacks, 1294 // rather than using a global overflow list chained through 1295 // the klass word of the object's pre-image. 1296 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1297 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1298 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1299 } 1300 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1301 } 1302 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1303} 1304 1305// Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1306// sparc/solaris for certain applications, but would gain from 1307// further optimization and tuning efforts, and would almost 1308// certainly gain from analysis of platform and environment. 1309void Arguments::set_cms_and_parnew_gc_flags() { 1310 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1311 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1312 assert(UseParNewGC, "ParNew should always be used with CMS"); 1313 1314 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1315 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1316 1317 set_parnew_gc_flags(); 1318 1319 size_t max_heap = align_size_down(MaxHeapSize, 1320 CardTableRS::ct_max_alignment_constraint()); 1321 1322 // Now make adjustments for CMS 1323 intx tenuring_default = (intx)6; 1324 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1325 1326 // Preferred young gen size for "short" pauses: 1327 // upper bound depends on # of threads and NewRatio. 1328 const uintx parallel_gc_threads = 1329 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1330 const size_t preferred_max_new_size_unaligned = 1331 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1332 size_t preferred_max_new_size = 1333 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1334 1335 // Unless explicitly requested otherwise, size young gen 1336 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1337 1338 // If either MaxNewSize or NewRatio is set on the command line, 1339 // assume the user is trying to set the size of the young gen. 1340 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1341 1342 // Set MaxNewSize to our calculated preferred_max_new_size unless 1343 // NewSize was set on the command line and it is larger than 1344 // preferred_max_new_size. 1345 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1346 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1347 } else { 1348 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size); 1349 } 1350 if (PrintGCDetails && Verbose) { 1351 // Too early to use gclog_or_tty 1352 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1353 } 1354 1355 // Code along this path potentially sets NewSize and OldSize 1356 if (PrintGCDetails && Verbose) { 1357 // Too early to use gclog_or_tty 1358 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1359 " initial_heap_size: " SIZE_FORMAT 1360 " max_heap: " SIZE_FORMAT, 1361 min_heap_size(), InitialHeapSize, max_heap); 1362 } 1363 size_t min_new = preferred_max_new_size; 1364 if (FLAG_IS_CMDLINE(NewSize)) { 1365 min_new = NewSize; 1366 } 1367 if (max_heap > min_new && min_heap_size() > min_new) { 1368 // Unless explicitly requested otherwise, make young gen 1369 // at least min_new, and at most preferred_max_new_size. 1370 if (FLAG_IS_DEFAULT(NewSize)) { 1371 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new)); 1372 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize)); 1373 if (PrintGCDetails && Verbose) { 1374 // Too early to use gclog_or_tty 1375 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1376 } 1377 } 1378 // Unless explicitly requested otherwise, size old gen 1379 // so it's NewRatio x of NewSize. 1380 if (FLAG_IS_DEFAULT(OldSize)) { 1381 if (max_heap > NewSize) { 1382 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1383 if (PrintGCDetails && Verbose) { 1384 // Too early to use gclog_or_tty 1385 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1386 } 1387 } 1388 } 1389 } 1390 } 1391 // Unless explicitly requested otherwise, definitely 1392 // promote all objects surviving "tenuring_default" scavenges. 1393 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1394 FLAG_IS_DEFAULT(SurvivorRatio)) { 1395 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1396 } 1397 // If we decided above (or user explicitly requested) 1398 // `promote all' (via MaxTenuringThreshold := 0), 1399 // prefer minuscule survivor spaces so as not to waste 1400 // space for (non-existent) survivors 1401 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1402 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1403 } 1404 1405 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1406 // but rather the number of free blocks of a given size that are used when 1407 // replenishing the local per-worker free list caches. 1408 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1409 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1410 // OldPLAB sizing manually turned off: Use a larger default setting, 1411 // unless it was manually specified. This is because a too-low value 1412 // will slow down scavenges. 1413 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166 1414 } else { 1415 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1416 } 1417 } 1418 1419 // If either of the static initialization defaults have changed, note this 1420 // modification. 1421 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1422 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1423 } 1424 if (PrintGCDetails && Verbose) { 1425 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1426 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1427 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1428 } 1429} 1430#endif // INCLUDE_ALL_GCS 1431 1432void set_object_alignment() { 1433 // Object alignment. 1434 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1435 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1436 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1437 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1438 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1439 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1440 1441 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1442 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1443 1444 // Oop encoding heap max 1445 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1446 1447#if INCLUDE_ALL_GCS 1448 // Set CMS global values 1449 CompactibleFreeListSpace::set_cms_values(); 1450#endif // INCLUDE_ALL_GCS 1451} 1452 1453bool verify_object_alignment() { 1454 // Object alignment. 1455 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1456 jio_fprintf(defaultStream::error_stream(), 1457 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1458 (int)ObjectAlignmentInBytes); 1459 return false; 1460 } 1461 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1462 jio_fprintf(defaultStream::error_stream(), 1463 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1464 (int)ObjectAlignmentInBytes, BytesPerLong); 1465 return false; 1466 } 1467 // It does not make sense to have big object alignment 1468 // since a space lost due to alignment will be greater 1469 // then a saved space from compressed oops. 1470 if ((int)ObjectAlignmentInBytes > 256) { 1471 jio_fprintf(defaultStream::error_stream(), 1472 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1473 (int)ObjectAlignmentInBytes); 1474 return false; 1475 } 1476 // In case page size is very small. 1477 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1478 jio_fprintf(defaultStream::error_stream(), 1479 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1480 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1481 return false; 1482 } 1483 if(SurvivorAlignmentInBytes == 0) { 1484 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1485 } else { 1486 if (!is_power_of_2(SurvivorAlignmentInBytes)) { 1487 jio_fprintf(defaultStream::error_stream(), 1488 "error: SurvivorAlignmentInBytes=%d must be power of 2\n", 1489 (int)SurvivorAlignmentInBytes); 1490 return false; 1491 } 1492 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) { 1493 jio_fprintf(defaultStream::error_stream(), 1494 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n", 1495 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes); 1496 return false; 1497 } 1498 } 1499 return true; 1500} 1501 1502size_t Arguments::max_heap_for_compressed_oops() { 1503 // Avoid sign flip. 1504 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1505 // We need to fit both the NULL page and the heap into the memory budget, while 1506 // keeping alignment constraints of the heap. To guarantee the latter, as the 1507 // NULL page is located before the heap, we pad the NULL page to the conservative 1508 // maximum alignment that the GC may ever impose upon the heap. 1509 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1510 _conservative_max_heap_alignment); 1511 1512 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1513 NOT_LP64(ShouldNotReachHere(); return 0); 1514} 1515 1516bool Arguments::should_auto_select_low_pause_collector() { 1517 if (UseAutoGCSelectPolicy && 1518 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1519 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1520 if (PrintGCDetails) { 1521 // Cannot use gclog_or_tty yet. 1522 tty->print_cr("Automatic selection of the low pause collector" 1523 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1524 } 1525 return true; 1526 } 1527 return false; 1528} 1529 1530void Arguments::set_use_compressed_oops() { 1531#ifndef ZERO 1532#ifdef _LP64 1533 // MaxHeapSize is not set up properly at this point, but 1534 // the only value that can override MaxHeapSize if we are 1535 // to use UseCompressedOops is InitialHeapSize. 1536 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1537 1538 if (max_heap_size <= max_heap_for_compressed_oops()) { 1539#if !defined(COMPILER1) || defined(TIERED) 1540 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1541 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1542 } 1543#endif 1544 } else { 1545 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1546 warning("Max heap size too large for Compressed Oops"); 1547 FLAG_SET_DEFAULT(UseCompressedOops, false); 1548 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1549 } 1550 } 1551#endif // _LP64 1552#endif // ZERO 1553} 1554 1555 1556// NOTE: set_use_compressed_klass_ptrs() must be called after calling 1557// set_use_compressed_oops(). 1558void Arguments::set_use_compressed_klass_ptrs() { 1559#ifndef ZERO 1560#ifdef _LP64 1561 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1562 if (!UseCompressedOops) { 1563 if (UseCompressedClassPointers) { 1564 warning("UseCompressedClassPointers requires UseCompressedOops"); 1565 } 1566 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1567 } else { 1568 // Turn on UseCompressedClassPointers too 1569 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1570 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1571 } 1572 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1573 if (UseCompressedClassPointers) { 1574 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1575 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1576 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1577 } 1578 } 1579 } 1580#endif // _LP64 1581#endif // !ZERO 1582} 1583 1584void Arguments::set_conservative_max_heap_alignment() { 1585 // The conservative maximum required alignment for the heap is the maximum of 1586 // the alignments imposed by several sources: any requirements from the heap 1587 // itself, the collector policy and the maximum page size we may run the VM 1588 // with. 1589 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1590#if INCLUDE_ALL_GCS 1591 if (UseParallelGC) { 1592 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1593 } else if (UseG1GC) { 1594 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1595 } 1596#endif // INCLUDE_ALL_GCS 1597 _conservative_max_heap_alignment = MAX4(heap_alignment, 1598 (size_t)os::vm_allocation_granularity(), 1599 os::max_page_size(), 1600 CollectorPolicy::compute_heap_alignment()); 1601} 1602 1603void Arguments::select_gc_ergonomically() { 1604 if (os::is_server_class_machine()) { 1605 if (should_auto_select_low_pause_collector()) { 1606 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1607 } else { 1608 FLAG_SET_ERGO(bool, UseParallelGC, true); 1609 } 1610 } 1611} 1612 1613void Arguments::select_gc() { 1614 if (!gc_selected()) { 1615 select_gc_ergonomically(); 1616 } 1617} 1618 1619void Arguments::set_ergonomics_flags() { 1620 select_gc(); 1621 1622#ifdef COMPILER2 1623 // Shared spaces work fine with other GCs but causes bytecode rewriting 1624 // to be disabled, which hurts interpreter performance and decreases 1625 // server performance. When -server is specified, keep the default off 1626 // unless it is asked for. Future work: either add bytecode rewriting 1627 // at link time, or rewrite bytecodes in non-shared methods. 1628 if (!DumpSharedSpaces && !RequireSharedSpaces && 1629 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1630 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1631 } 1632#endif 1633 1634 set_conservative_max_heap_alignment(); 1635 1636#ifndef ZERO 1637#ifdef _LP64 1638 set_use_compressed_oops(); 1639 1640 // set_use_compressed_klass_ptrs() must be called after calling 1641 // set_use_compressed_oops(). 1642 set_use_compressed_klass_ptrs(); 1643 1644 // Also checks that certain machines are slower with compressed oops 1645 // in vm_version initialization code. 1646#endif // _LP64 1647#endif // !ZERO 1648} 1649 1650void Arguments::set_parallel_gc_flags() { 1651 assert(UseParallelGC || UseParallelOldGC, "Error"); 1652 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1653 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1654 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1655 } 1656 FLAG_SET_DEFAULT(UseParallelGC, true); 1657 1658 // If no heap maximum was requested explicitly, use some reasonable fraction 1659 // of the physical memory, up to a maximum of 1GB. 1660 FLAG_SET_DEFAULT(ParallelGCThreads, 1661 Abstract_VM_Version::parallel_worker_threads()); 1662 if (ParallelGCThreads == 0) { 1663 jio_fprintf(defaultStream::error_stream(), 1664 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1665 vm_exit(1); 1666 } 1667 1668 if (UseAdaptiveSizePolicy) { 1669 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1670 // unless the user actually sets these flags. 1671 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1672 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1673 _min_heap_free_ratio = MinHeapFreeRatio; 1674 } 1675 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1676 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1677 _max_heap_free_ratio = MaxHeapFreeRatio; 1678 } 1679 } 1680 1681 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1682 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1683 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1684 // See CR 6362902 for details. 1685 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1686 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1687 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1688 } 1689 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1690 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1691 } 1692 } 1693 1694 if (UseParallelOldGC) { 1695 // Par compact uses lower default values since they are treated as 1696 // minimums. These are different defaults because of the different 1697 // interpretation and are not ergonomically set. 1698 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1699 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1700 } 1701 } 1702} 1703 1704void Arguments::set_g1_gc_flags() { 1705 assert(UseG1GC, "Error"); 1706#ifdef COMPILER1 1707 FastTLABRefill = false; 1708#endif 1709 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1710 if (ParallelGCThreads == 0) { 1711 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1712 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1713 } 1714 1715#if INCLUDE_ALL_GCS 1716 if (G1ConcRefinementThreads == 0) { 1717 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads); 1718 } 1719#endif 1720 1721 // MarkStackSize will be set (if it hasn't been set by the user) 1722 // when concurrent marking is initialized. 1723 // Its value will be based upon the number of parallel marking threads. 1724 // But we do set the maximum mark stack size here. 1725 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1726 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1727 } 1728 1729 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1730 // In G1, we want the default GC overhead goal to be higher than 1731 // say in PS. So we set it here to 10%. Otherwise the heap might 1732 // be expanded more aggressively than we would like it to. In 1733 // fact, even 10% seems to not be high enough in some cases 1734 // (especially small GC stress tests that the main thing they do 1735 // is allocation). We might consider increase it further. 1736 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1737 } 1738 1739 if (PrintGCDetails && Verbose) { 1740 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1741 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1742 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1743 } 1744} 1745 1746#if !INCLUDE_ALL_GCS 1747#ifdef ASSERT 1748static bool verify_serial_gc_flags() { 1749 return (UseSerialGC && 1750 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC || 1751 UseParallelGC || UseParallelOldGC)); 1752} 1753#endif // ASSERT 1754#endif // INCLUDE_ALL_GCS 1755 1756void Arguments::set_gc_specific_flags() { 1757#if INCLUDE_ALL_GCS 1758 // Set per-collector flags 1759 if (UseParallelGC || UseParallelOldGC) { 1760 set_parallel_gc_flags(); 1761 } else if (UseConcMarkSweepGC) { 1762 set_cms_and_parnew_gc_flags(); 1763 } else if (UseG1GC) { 1764 set_g1_gc_flags(); 1765 } 1766 check_deprecated_gc_flags(); 1767 if (AssumeMP && !UseSerialGC) { 1768 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 1769 warning("If the number of processors is expected to increase from one, then" 1770 " you should configure the number of parallel GC threads appropriately" 1771 " using -XX:ParallelGCThreads=N"); 1772 } 1773 } 1774 if (MinHeapFreeRatio == 100) { 1775 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1776 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 1777 } 1778#else // INCLUDE_ALL_GCS 1779 assert(verify_serial_gc_flags(), "SerialGC unset"); 1780#endif // INCLUDE_ALL_GCS 1781} 1782 1783julong Arguments::limit_by_allocatable_memory(julong limit) { 1784 julong max_allocatable; 1785 julong result = limit; 1786 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1787 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1788 } 1789 return result; 1790} 1791 1792// Use static initialization to get the default before parsing 1793static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1794 1795void Arguments::set_heap_size() { 1796 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1797 // Deprecated flag 1798 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1799 } 1800 1801 const julong phys_mem = 1802 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1803 : (julong)MaxRAM; 1804 1805 // If the maximum heap size has not been set with -Xmx, 1806 // then set it as fraction of the size of physical memory, 1807 // respecting the maximum and minimum sizes of the heap. 1808 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1809 julong reasonable_max = phys_mem / MaxRAMFraction; 1810 1811 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1812 // Small physical memory, so use a minimum fraction of it for the heap 1813 reasonable_max = phys_mem / MinRAMFraction; 1814 } else { 1815 // Not-small physical memory, so require a heap at least 1816 // as large as MaxHeapSize 1817 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1818 } 1819 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1820 // Limit the heap size to ErgoHeapSizeLimit 1821 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1822 } 1823 if (UseCompressedOops) { 1824 // Limit the heap size to the maximum possible when using compressed oops 1825 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1826 1827 // HeapBaseMinAddress can be greater than default but not less than. 1828 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1829 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1830 // matches compressed oops printing flags 1831 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 1832 jio_fprintf(defaultStream::error_stream(), 1833 "HeapBaseMinAddress must be at least " SIZE_FORMAT 1834 " (" SIZE_FORMAT "G) which is greater than value given " 1835 SIZE_FORMAT "\n", 1836 DefaultHeapBaseMinAddress, 1837 DefaultHeapBaseMinAddress/G, 1838 HeapBaseMinAddress); 1839 } 1840 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1841 } 1842 } 1843 1844 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1845 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1846 // but it should be not less than default MaxHeapSize. 1847 max_coop_heap -= HeapBaseMinAddress; 1848 } 1849 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1850 } 1851 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1852 1853 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1854 // An initial heap size was specified on the command line, 1855 // so be sure that the maximum size is consistent. Done 1856 // after call to limit_by_allocatable_memory because that 1857 // method might reduce the allocation size. 1858 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1859 } 1860 1861 if (PrintGCDetails && Verbose) { 1862 // Cannot use gclog_or_tty yet. 1863 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1864 } 1865 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 1866 } 1867 1868 // If the minimum or initial heap_size have not been set or requested to be set 1869 // ergonomically, set them accordingly. 1870 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1871 julong reasonable_minimum = (julong)(OldSize + NewSize); 1872 1873 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1874 1875 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1876 1877 if (InitialHeapSize == 0) { 1878 julong reasonable_initial = phys_mem / InitialRAMFraction; 1879 1880 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1881 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1882 1883 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1884 1885 if (PrintGCDetails && Verbose) { 1886 // Cannot use gclog_or_tty yet. 1887 tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 1888 } 1889 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 1890 } 1891 // If the minimum heap size has not been set (via -Xms), 1892 // synchronize with InitialHeapSize to avoid errors with the default value. 1893 if (min_heap_size() == 0) { 1894 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1895 if (PrintGCDetails && Verbose) { 1896 // Cannot use gclog_or_tty yet. 1897 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1898 } 1899 } 1900 } 1901} 1902 1903// This must be called after ergonomics because we want bytecode rewriting 1904// if the server compiler is used, or if UseSharedSpaces is disabled. 1905void Arguments::set_bytecode_flags() { 1906 // Better not attempt to store into a read-only space. 1907 if (UseSharedSpaces) { 1908 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1909 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1910 } 1911 1912 if (!RewriteBytecodes) { 1913 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1914 } 1915} 1916 1917// Aggressive optimization flags -XX:+AggressiveOpts 1918void Arguments::set_aggressive_opts_flags() { 1919#ifdef COMPILER2 1920 if (AggressiveUnboxing) { 1921 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1922 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1923 } else if (!EliminateAutoBox) { 1924 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1925 AggressiveUnboxing = false; 1926 } 1927 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1928 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1929 } else if (!DoEscapeAnalysis) { 1930 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1931 AggressiveUnboxing = false; 1932 } 1933 } 1934 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1935 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1936 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1937 } 1938 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1939 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1940 } 1941 1942 // Feed the cache size setting into the JDK 1943 char buffer[1024]; 1944 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1945 add_property(buffer); 1946 } 1947 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1948 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1949 } 1950#endif 1951 1952 if (AggressiveOpts) { 1953// Sample flag setting code 1954// if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1955// FLAG_SET_DEFAULT(EliminateZeroing, true); 1956// } 1957 } 1958} 1959 1960//=========================================================================================================== 1961// Parsing of java.compiler property 1962 1963void Arguments::process_java_compiler_argument(char* arg) { 1964 // For backwards compatibility, Djava.compiler=NONE or "" 1965 // causes us to switch to -Xint mode UNLESS -Xdebug 1966 // is also specified. 1967 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1968 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1969 } 1970} 1971 1972void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1973 _sun_java_launcher = os::strdup_check_oom(launcher); 1974} 1975 1976bool Arguments::created_by_java_launcher() { 1977 assert(_sun_java_launcher != NULL, "property must have value"); 1978 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1979} 1980 1981bool Arguments::sun_java_launcher_is_altjvm() { 1982 return _sun_java_launcher_is_altjvm; 1983} 1984 1985//=========================================================================================================== 1986// Parsing of main arguments 1987 1988bool Arguments::verify_interval(uintx val, uintx min, 1989 uintx max, const char* name) { 1990 // Returns true iff value is in the inclusive interval [min..max] 1991 // false, otherwise. 1992 if (val >= min && val <= max) { 1993 return true; 1994 } 1995 jio_fprintf(defaultStream::error_stream(), 1996 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1997 " and " UINTX_FORMAT "\n", 1998 name, val, min, max); 1999 return false; 2000} 2001 2002bool Arguments::verify_min_value(intx val, intx min, const char* name) { 2003 // Returns true if given value is at least specified min threshold 2004 // false, otherwise. 2005 if (val >= min ) { 2006 return true; 2007 } 2008 jio_fprintf(defaultStream::error_stream(), 2009 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 2010 name, val, min); 2011 return false; 2012} 2013 2014bool Arguments::verify_percentage(uintx value, const char* name) { 2015 if (is_percentage(value)) { 2016 return true; 2017 } 2018 jio_fprintf(defaultStream::error_stream(), 2019 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 2020 name, value); 2021 return false; 2022} 2023 2024// check if do gclog rotation 2025// +UseGCLogFileRotation is a must, 2026// no gc log rotation when log file not supplied or 2027// NumberOfGCLogFiles is 0 2028void check_gclog_consistency() { 2029 if (UseGCLogFileRotation) { 2030 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { 2031 jio_fprintf(defaultStream::output_stream(), 2032 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" 2033 "where num_of_file > 0\n" 2034 "GC log rotation is turned off\n"); 2035 UseGCLogFileRotation = false; 2036 } 2037 } 2038 2039 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { 2040 FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K); 2041 jio_fprintf(defaultStream::output_stream(), 2042 "GCLogFileSize changed to minimum 8K\n"); 2043 } 2044} 2045 2046// This function is called for -Xloggc:<filename>, it can be used 2047// to check if a given file name(or string) conforms to the following 2048// specification: 2049// A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 2050// %p and %t only allowed once. We only limit usage of filename not path 2051bool is_filename_valid(const char *file_name) { 2052 const char* p = file_name; 2053 char file_sep = os::file_separator()[0]; 2054 const char* cp; 2055 // skip prefix path 2056 for (cp = file_name; *cp != '\0'; cp++) { 2057 if (*cp == '/' || *cp == file_sep) { 2058 p = cp + 1; 2059 } 2060 } 2061 2062 int count_p = 0; 2063 int count_t = 0; 2064 while (*p != '\0') { 2065 if ((*p >= '0' && *p <= '9') || 2066 (*p >= 'A' && *p <= 'Z') || 2067 (*p >= 'a' && *p <= 'z') || 2068 *p == '-' || 2069 *p == '_' || 2070 *p == '.') { 2071 p++; 2072 continue; 2073 } 2074 if (*p == '%') { 2075 if(*(p + 1) == 'p') { 2076 p += 2; 2077 count_p ++; 2078 continue; 2079 } 2080 if (*(p + 1) == 't') { 2081 p += 2; 2082 count_t ++; 2083 continue; 2084 } 2085 } 2086 return false; 2087 } 2088 return count_p < 2 && count_t < 2; 2089} 2090 2091bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) { 2092 if (!is_percentage(min_heap_free_ratio)) { 2093 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100"); 2094 return false; 2095 } 2096 if (min_heap_free_ratio > MaxHeapFreeRatio) { 2097 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 2098 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio, 2099 MaxHeapFreeRatio); 2100 return false; 2101 } 2102 // This does not set the flag itself, but stores the value in a safe place for later usage. 2103 _min_heap_free_ratio = min_heap_free_ratio; 2104 return true; 2105} 2106 2107bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) { 2108 if (!is_percentage(max_heap_free_ratio)) { 2109 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100"); 2110 return false; 2111 } 2112 if (max_heap_free_ratio < MinHeapFreeRatio) { 2113 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or " 2114 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio, 2115 MinHeapFreeRatio); 2116 return false; 2117 } 2118 // This does not set the flag itself, but stores the value in a safe place for later usage. 2119 _max_heap_free_ratio = max_heap_free_ratio; 2120 return true; 2121} 2122 2123// Check consistency of GC selection 2124bool Arguments::check_gc_consistency() { 2125 check_gclog_consistency(); 2126 // Ensure that the user has not selected conflicting sets 2127 // of collectors. 2128 uint i = 0; 2129 if (UseSerialGC) i++; 2130 if (UseConcMarkSweepGC) i++; 2131 if (UseParallelGC || UseParallelOldGC) i++; 2132 if (UseG1GC) i++; 2133 if (i > 1) { 2134 jio_fprintf(defaultStream::error_stream(), 2135 "Conflicting collector combinations in option list; " 2136 "please refer to the release notes for the combinations " 2137 "allowed\n"); 2138 return false; 2139 } 2140 2141 if (UseConcMarkSweepGC && !UseParNewGC) { 2142 jio_fprintf(defaultStream::error_stream(), 2143 "It is not possible to combine the DefNew young collector with the CMS collector.\n"); 2144 return false; 2145 } 2146 2147 if (UseParNewGC && !UseConcMarkSweepGC) { 2148 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 2149 // set up UseSerialGC properly, so that can't be used in the check here. 2150 jio_fprintf(defaultStream::error_stream(), 2151 "It is not possible to combine the ParNew young collector with the Serial old collector.\n"); 2152 return false; 2153 } 2154 2155 return true; 2156} 2157 2158void Arguments::check_deprecated_gc_flags() { 2159 if (FLAG_IS_CMDLINE(UseParNewGC)) { 2160 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release"); 2161 } 2162 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 2163 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 2164 "and will likely be removed in future release"); 2165 } 2166 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 2167 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 2168 "Use MaxRAMFraction instead."); 2169 } 2170} 2171 2172// Check stack pages settings 2173bool Arguments::check_stack_pages() 2174{ 2175 bool status = true; 2176 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 2177 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 2178 // greater stack shadow pages can't generate instruction to bang stack 2179 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 2180 return status; 2181} 2182 2183// Check the consistency of vm_init_args 2184bool Arguments::check_vm_args_consistency() { 2185 // Method for adding checks for flag consistency. 2186 // The intent is to warn the user of all possible conflicts, 2187 // before returning an error. 2188 // Note: Needs platform-dependent factoring. 2189 bool status = true; 2190 2191 if (TLABRefillWasteFraction == 0) { 2192 jio_fprintf(defaultStream::error_stream(), 2193 "TLABRefillWasteFraction should be a denominator, " 2194 "not " SIZE_FORMAT "\n", 2195 TLABRefillWasteFraction); 2196 status = false; 2197 } 2198 2199 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 2200 "AdaptiveSizePolicyWeight"); 2201 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 2202 2203 // Divide by bucket size to prevent a large size from causing rollover when 2204 // calculating amount of memory needed to be allocated for the String table. 2205 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2206 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2207 2208 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize, 2209 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size"); 2210 2211 { 2212 // Using "else if" below to avoid printing two error messages if min > max. 2213 // This will also prevent us from reporting both min>100 and max>100 at the 2214 // same time, but that is less annoying than printing two identical errors IMHO. 2215 FormatBuffer<80> err_msg("%s",""); 2216 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) { 2217 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2218 status = false; 2219 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) { 2220 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2221 status = false; 2222 } 2223 } 2224 2225 // Min/MaxMetaspaceFreeRatio 2226 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2227 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2228 2229 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2230 jio_fprintf(defaultStream::error_stream(), 2231 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2232 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2233 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2234 MinMetaspaceFreeRatio, 2235 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2236 MaxMetaspaceFreeRatio); 2237 status = false; 2238 } 2239 2240 // Trying to keep 100% free is not practical 2241 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2242 2243 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2244 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2245 } 2246 2247 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2248 // Settings to encourage splitting. 2249 if (!FLAG_IS_CMDLINE(NewRatio)) { 2250 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2251 } 2252 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2253 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2254 } 2255 } 2256 2257 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2258 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2259 } 2260 2261 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2262 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2263 if (GCTimeLimit == 100) { 2264 // Turn off gc-overhead-limit-exceeded checks 2265 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2266 } 2267 2268 status = status && check_gc_consistency(); 2269 status = status && check_stack_pages(); 2270 2271 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2272 "CMSIncrementalSafetyFactor"); 2273 2274 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2275 // insists that we hold the requisite locks so that the iteration is 2276 // MT-safe. For the verification at start-up and shut-down, we don't 2277 // yet have a good way of acquiring and releasing these locks, 2278 // which are not visible at the CollectedHeap level. We want to 2279 // be able to acquire these locks and then do the iteration rather 2280 // than just disable the lock verification. This will be fixed under 2281 // bug 4788986. 2282 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2283 if (VerifyDuringStartup) { 2284 warning("Heap verification at start-up disabled " 2285 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2286 VerifyDuringStartup = false; // Disable verification at start-up 2287 } 2288 2289 if (VerifyBeforeExit) { 2290 warning("Heap verification at shutdown disabled " 2291 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2292 VerifyBeforeExit = false; // Disable verification at shutdown 2293 } 2294 } 2295 2296 // Note: only executed in non-PRODUCT mode 2297 if (!UseAsyncConcMarkSweepGC && 2298 (ExplicitGCInvokesConcurrent || 2299 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2300 jio_fprintf(defaultStream::error_stream(), 2301 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2302 " with -UseAsyncConcMarkSweepGC"); 2303 status = false; 2304 } 2305 2306 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2307 2308#if INCLUDE_ALL_GCS 2309 if (UseG1GC) { 2310 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent"); 2311 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent"); 2312 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent"); 2313 2314 status = status && verify_percentage(G1ConfidencePercent, "G1ConfidencePercent"); 2315 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2316 "InitiatingHeapOccupancyPercent"); 2317 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2318 "G1RefProcDrainInterval"); 2319 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2320 "G1ConcMarkStepDurationMillis"); 2321 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2322 "G1ConcRSHotCardLimit"); 2323 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2324 "G1ConcRSLogCacheSize"); 2325 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age, 2326 "StringDeduplicationAgeThreshold"); 2327 } 2328 if (UseConcMarkSweepGC) { 2329 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2330 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2331 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2332 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2333 2334 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2335 2336 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2337 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2338 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2339 2340 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2341 2342 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2343 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2344 2345 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2346 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2347 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2348 2349 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2350 2351 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2352 2353 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2354 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2355 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2356 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2357 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2358 } 2359 2360 if (UseParallelGC || UseParallelOldGC) { 2361 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2362 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2363 2364 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2365 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2366 2367 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2368 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2369 2370 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2371 2372 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2373 } 2374#endif // INCLUDE_ALL_GCS 2375 2376 status = status && verify_interval(RefDiscoveryPolicy, 2377 ReferenceProcessor::DiscoveryPolicyMin, 2378 ReferenceProcessor::DiscoveryPolicyMax, 2379 "RefDiscoveryPolicy"); 2380 2381 // Limit the lower bound of this flag to 1 as it is used in a division 2382 // expression. 2383 status = status && verify_interval(TLABWasteTargetPercent, 2384 1, 100, "TLABWasteTargetPercent"); 2385 2386 status = status && verify_object_alignment(); 2387 2388 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2389 "CompressedClassSpaceSize"); 2390 2391 status = status && verify_interval(MarkStackSizeMax, 2392 1, (max_jint - 1), "MarkStackSizeMax"); 2393 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2394 2395 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2396 2397 status = status && verify_min_value(HeapSizePerGCThread, (size_t) os::vm_page_size(), "HeapSizePerGCThread"); 2398 2399 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2400 2401 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2402 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2403 2404 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2405 2406 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2407 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2408 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2409 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2410 2411 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2412 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2413 2414 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2415 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2416 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2417 2418 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2419 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2420 2421 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold"); 2422 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold"); 2423 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2424 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2425 2426 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2427#ifdef COMPILER1 2428 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize"); 2429#endif 2430 status = status && verify_min_value(HeapSearchSteps, 1, "HeapSearchSteps"); 2431 2432 if (PrintNMTStatistics) { 2433#if INCLUDE_NMT 2434 if (MemTracker::tracking_level() == NMT_off) { 2435#endif // INCLUDE_NMT 2436 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2437 PrintNMTStatistics = false; 2438#if INCLUDE_NMT 2439 } 2440#endif 2441 } 2442 2443 // Need to limit the extent of the padding to reasonable size. 2444 // 8K is well beyond the reasonable HW cache line size, even with the 2445 // aggressive prefetching, while still leaving the room for segregating 2446 // among the distinct pages. 2447 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2448 jio_fprintf(defaultStream::error_stream(), 2449 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2450 ContendedPaddingWidth, 0, 8192); 2451 status = false; 2452 } 2453 2454 // Need to enforce the padding not to break the existing field alignments. 2455 // It is sufficient to check against the largest type size. 2456 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2457 jio_fprintf(defaultStream::error_stream(), 2458 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2459 ContendedPaddingWidth, BytesPerLong); 2460 status = false; 2461 } 2462 2463 // Check lower bounds of the code cache 2464 // Template Interpreter code is approximately 3X larger in debug builds. 2465 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2466 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2467 jio_fprintf(defaultStream::error_stream(), 2468 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2469 os::vm_page_size()/K); 2470 status = false; 2471 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2472 jio_fprintf(defaultStream::error_stream(), 2473 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2474 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2475 status = false; 2476 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2477 jio_fprintf(defaultStream::error_stream(), 2478 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2479 min_code_cache_size/K); 2480 status = false; 2481 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2482 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2483 jio_fprintf(defaultStream::error_stream(), 2484 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2485 CODE_CACHE_SIZE_LIMIT/M); 2486 status = false; 2487 } else if (NonNMethodCodeHeapSize < min_code_cache_size){ 2488 jio_fprintf(defaultStream::error_stream(), 2489 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2490 min_code_cache_size/K); 2491 status = false; 2492 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) 2493 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 2494 jio_fprintf(defaultStream::error_stream(), 2495 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 2496 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 2497 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 2498 status = false; 2499 } 2500 2501 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); 2502 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength"); 2503 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize"); 2504 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt"); 2505 2506 2507 int min_number_of_compiler_threads = get_min_number_of_compiler_threads(); 2508 // The default CICompilerCount's value is CI_COMPILER_COUNT. 2509 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number"); 2510 // Check the minimum number of compiler threads 2511 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount"); 2512 2513 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2514 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2515 } 2516 2517 return status; 2518} 2519 2520bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2521 const char* option_type) { 2522 if (ignore) return false; 2523 2524 const char* spacer = " "; 2525 if (option_type == NULL) { 2526 option_type = ++spacer; // Set both to the empty string. 2527 } 2528 2529 if (os::obsolete_option(option)) { 2530 jio_fprintf(defaultStream::error_stream(), 2531 "Obsolete %s%soption: %s\n", option_type, spacer, 2532 option->optionString); 2533 return false; 2534 } else { 2535 jio_fprintf(defaultStream::error_stream(), 2536 "Unrecognized %s%soption: %s\n", option_type, spacer, 2537 option->optionString); 2538 return true; 2539 } 2540} 2541 2542static const char* user_assertion_options[] = { 2543 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2544}; 2545 2546static const char* system_assertion_options[] = { 2547 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2548}; 2549 2550bool Arguments::parse_uintx(const char* value, 2551 uintx* uintx_arg, 2552 uintx min_size) { 2553 2554 // Check the sign first since atomull() parses only unsigned values. 2555 bool value_is_positive = !(*value == '-'); 2556 2557 if (value_is_positive) { 2558 julong n; 2559 bool good_return = atomull(value, &n); 2560 if (good_return) { 2561 bool above_minimum = n >= min_size; 2562 bool value_is_too_large = n > max_uintx; 2563 2564 if (above_minimum && !value_is_too_large) { 2565 *uintx_arg = n; 2566 return true; 2567 } 2568 } 2569 } 2570 return false; 2571} 2572 2573Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2574 julong* long_arg, 2575 julong min_size) { 2576 if (!atomull(s, long_arg)) return arg_unreadable; 2577 return check_memory_size(*long_arg, min_size); 2578} 2579 2580// Parse JavaVMInitArgs structure 2581 2582jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2583 // For components of the system classpath. 2584 SysClassPath scp(Arguments::get_sysclasspath()); 2585 bool scp_assembly_required = false; 2586 2587 // Save default settings for some mode flags 2588 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2589 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2590 Arguments::_ClipInlining = ClipInlining; 2591 Arguments::_BackgroundCompilation = BackgroundCompilation; 2592 2593 // Setup flags for mixed which is the default 2594 set_mode_flags(_mixed); 2595 2596 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2597 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2598 if (result != JNI_OK) { 2599 return result; 2600 } 2601 2602 // Parse JavaVMInitArgs structure passed in 2603 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE); 2604 if (result != JNI_OK) { 2605 return result; 2606 } 2607 2608 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2609 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2610 if (result != JNI_OK) { 2611 return result; 2612 } 2613 2614 // Do final processing now that all arguments have been parsed 2615 result = finalize_vm_init_args(&scp, scp_assembly_required); 2616 if (result != JNI_OK) { 2617 return result; 2618 } 2619 2620 return JNI_OK; 2621} 2622 2623// Checks if name in command-line argument -agent{lib,path}:name[=options] 2624// represents a valid HPROF of JDWP agent. is_path==true denotes that we 2625// are dealing with -agentpath (case where name is a path), otherwise with 2626// -agentlib 2627bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2628 char *_name; 2629 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2630 size_t _len_hprof, _len_jdwp, _len_prefix; 2631 2632 if (is_path) { 2633 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2634 return false; 2635 } 2636 2637 _name++; // skip past last path separator 2638 _len_prefix = strlen(JNI_LIB_PREFIX); 2639 2640 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2641 return false; 2642 } 2643 2644 _name += _len_prefix; 2645 _len_hprof = strlen(_hprof); 2646 _len_jdwp = strlen(_jdwp); 2647 2648 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2649 _name += _len_hprof; 2650 } 2651 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2652 _name += _len_jdwp; 2653 } 2654 else { 2655 return false; 2656 } 2657 2658 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2659 return false; 2660 } 2661 2662 return true; 2663 } 2664 2665 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2666 return true; 2667 } 2668 2669 return false; 2670} 2671 2672jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2673 SysClassPath* scp_p, 2674 bool* scp_assembly_required_p, 2675 Flag::Flags origin) { 2676 // Remaining part of option string 2677 const char* tail; 2678 2679 // iterate over arguments 2680 for (int index = 0; index < args->nOptions; index++) { 2681 bool is_absolute_path = false; // for -agentpath vs -agentlib 2682 2683 const JavaVMOption* option = args->options + index; 2684 2685 if (!match_option(option, "-Djava.class.path", &tail) && 2686 !match_option(option, "-Dsun.java.command", &tail) && 2687 !match_option(option, "-Dsun.java.launcher", &tail)) { 2688 2689 // add all jvm options to the jvm_args string. This string 2690 // is used later to set the java.vm.args PerfData string constant. 2691 // the -Djava.class.path and the -Dsun.java.command options are 2692 // omitted from jvm_args string as each have their own PerfData 2693 // string constant object. 2694 build_jvm_args(option->optionString); 2695 } 2696 2697 // -verbose:[class/gc/jni] 2698 if (match_option(option, "-verbose", &tail)) { 2699 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2700 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2701 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2702 } else if (!strcmp(tail, ":gc")) { 2703 FLAG_SET_CMDLINE(bool, PrintGC, true); 2704 } else if (!strcmp(tail, ":jni")) { 2705 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2706 } 2707 // -da / -ea / -disableassertions / -enableassertions 2708 // These accept an optional class/package name separated by a colon, e.g., 2709 // -da:java.lang.Thread. 2710 } else if (match_option(option, user_assertion_options, &tail, true)) { 2711 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2712 if (*tail == '\0') { 2713 JavaAssertions::setUserClassDefault(enable); 2714 } else { 2715 assert(*tail == ':', "bogus match by match_option()"); 2716 JavaAssertions::addOption(tail + 1, enable); 2717 } 2718 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2719 } else if (match_option(option, system_assertion_options, &tail, false)) { 2720 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2721 JavaAssertions::setSystemClassDefault(enable); 2722 // -bootclasspath: 2723 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2724 scp_p->reset_path(tail); 2725 *scp_assembly_required_p = true; 2726 // -bootclasspath/a: 2727 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2728 scp_p->add_suffix(tail); 2729 *scp_assembly_required_p = true; 2730 // -bootclasspath/p: 2731 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2732 scp_p->add_prefix(tail); 2733 *scp_assembly_required_p = true; 2734 // -Xrun 2735 } else if (match_option(option, "-Xrun", &tail)) { 2736 if (tail != NULL) { 2737 const char* pos = strchr(tail, ':'); 2738 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2739 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2740 name[len] = '\0'; 2741 2742 char *options = NULL; 2743 if(pos != NULL) { 2744 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2745 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2746 } 2747#if !INCLUDE_JVMTI 2748 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2749 jio_fprintf(defaultStream::error_stream(), 2750 "Profiling and debugging agents are not supported in this VM\n"); 2751 return JNI_ERR; 2752 } 2753#endif // !INCLUDE_JVMTI 2754 add_init_library(name, options); 2755 } 2756 // -agentlib and -agentpath 2757 } else if (match_option(option, "-agentlib:", &tail) || 2758 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2759 if(tail != NULL) { 2760 const char* pos = strchr(tail, '='); 2761 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2762 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2763 name[len] = '\0'; 2764 2765 char *options = NULL; 2766 if(pos != NULL) { 2767 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2768 } 2769#if !INCLUDE_JVMTI 2770 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2771 jio_fprintf(defaultStream::error_stream(), 2772 "Profiling and debugging agents are not supported in this VM\n"); 2773 return JNI_ERR; 2774 } 2775#endif // !INCLUDE_JVMTI 2776 add_init_agent(name, options, is_absolute_path); 2777 } 2778 // -javaagent 2779 } else if (match_option(option, "-javaagent:", &tail)) { 2780#if !INCLUDE_JVMTI 2781 jio_fprintf(defaultStream::error_stream(), 2782 "Instrumentation agents are not supported in this VM\n"); 2783 return JNI_ERR; 2784#else 2785 if(tail != NULL) { 2786 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2787 add_init_agent("instrument", options, false); 2788 } 2789#endif // !INCLUDE_JVMTI 2790 // -Xnoclassgc 2791 } else if (match_option(option, "-Xnoclassgc")) { 2792 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2793 // -Xconcgc 2794 } else if (match_option(option, "-Xconcgc")) { 2795 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2796 // -Xnoconcgc 2797 } else if (match_option(option, "-Xnoconcgc")) { 2798 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2799 // -Xbatch 2800 } else if (match_option(option, "-Xbatch")) { 2801 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2802 // -Xmn for compatibility with other JVM vendors 2803 } else if (match_option(option, "-Xmn", &tail)) { 2804 julong long_initial_young_size = 0; 2805 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2806 if (errcode != arg_in_range) { 2807 jio_fprintf(defaultStream::error_stream(), 2808 "Invalid initial young generation size: %s\n", option->optionString); 2809 describe_range_error(errcode); 2810 return JNI_EINVAL; 2811 } 2812 FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size); 2813 FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size); 2814 // -Xms 2815 } else if (match_option(option, "-Xms", &tail)) { 2816 julong long_initial_heap_size = 0; 2817 // an initial heap size of 0 means automatically determine 2818 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2819 if (errcode != arg_in_range) { 2820 jio_fprintf(defaultStream::error_stream(), 2821 "Invalid initial heap size: %s\n", option->optionString); 2822 describe_range_error(errcode); 2823 return JNI_EINVAL; 2824 } 2825 set_min_heap_size((size_t)long_initial_heap_size); 2826 // Currently the minimum size and the initial heap sizes are the same. 2827 // Can be overridden with -XX:InitialHeapSize. 2828 FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size); 2829 // -Xmx 2830 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2831 julong long_max_heap_size = 0; 2832 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2833 if (errcode != arg_in_range) { 2834 jio_fprintf(defaultStream::error_stream(), 2835 "Invalid maximum heap size: %s\n", option->optionString); 2836 describe_range_error(errcode); 2837 return JNI_EINVAL; 2838 } 2839 FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size); 2840 // Xmaxf 2841 } else if (match_option(option, "-Xmaxf", &tail)) { 2842 char* err; 2843 int maxf = (int)(strtod(tail, &err) * 100); 2844 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) { 2845 jio_fprintf(defaultStream::error_stream(), 2846 "Bad max heap free percentage size: %s\n", 2847 option->optionString); 2848 return JNI_EINVAL; 2849 } else { 2850 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2851 } 2852 // Xminf 2853 } else if (match_option(option, "-Xminf", &tail)) { 2854 char* err; 2855 int minf = (int)(strtod(tail, &err) * 100); 2856 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) { 2857 jio_fprintf(defaultStream::error_stream(), 2858 "Bad min heap free percentage size: %s\n", 2859 option->optionString); 2860 return JNI_EINVAL; 2861 } else { 2862 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2863 } 2864 // -Xss 2865 } else if (match_option(option, "-Xss", &tail)) { 2866 julong long_ThreadStackSize = 0; 2867 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2868 if (errcode != arg_in_range) { 2869 jio_fprintf(defaultStream::error_stream(), 2870 "Invalid thread stack size: %s\n", option->optionString); 2871 describe_range_error(errcode); 2872 return JNI_EINVAL; 2873 } 2874 // Internally track ThreadStackSize in units of 1024 bytes. 2875 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2876 round_to((int)long_ThreadStackSize, K) / K); 2877 // -Xoss 2878 } else if (match_option(option, "-Xoss", &tail)) { 2879 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2880 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2881 julong long_CodeCacheExpansionSize = 0; 2882 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2883 if (errcode != arg_in_range) { 2884 jio_fprintf(defaultStream::error_stream(), 2885 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2886 os::vm_page_size()/K); 2887 return JNI_EINVAL; 2888 } 2889 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2890 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2891 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2892 julong long_ReservedCodeCacheSize = 0; 2893 2894 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2895 if (errcode != arg_in_range) { 2896 jio_fprintf(defaultStream::error_stream(), 2897 "Invalid maximum code cache size: %s.\n", option->optionString); 2898 return JNI_EINVAL; 2899 } 2900 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2901 // -XX:NonNMethodCodeHeapSize= 2902 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 2903 julong long_NonNMethodCodeHeapSize = 0; 2904 2905 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 2906 if (errcode != arg_in_range) { 2907 jio_fprintf(defaultStream::error_stream(), 2908 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 2909 return JNI_EINVAL; 2910 } 2911 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize); 2912 // -XX:ProfiledCodeHeapSize= 2913 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 2914 julong long_ProfiledCodeHeapSize = 0; 2915 2916 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 2917 if (errcode != arg_in_range) { 2918 jio_fprintf(defaultStream::error_stream(), 2919 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 2920 return JNI_EINVAL; 2921 } 2922 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize); 2923 // -XX:NonProfiledCodeHeapSizee= 2924 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 2925 julong long_NonProfiledCodeHeapSize = 0; 2926 2927 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 2928 if (errcode != arg_in_range) { 2929 jio_fprintf(defaultStream::error_stream(), 2930 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 2931 return JNI_EINVAL; 2932 } 2933 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize); 2934 //-XX:IncreaseFirstTierCompileThresholdAt= 2935 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2936 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2937 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2938 jio_fprintf(defaultStream::error_stream(), 2939 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2940 option->optionString); 2941 return JNI_EINVAL; 2942 } 2943 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2944 // -green 2945 } else if (match_option(option, "-green")) { 2946 jio_fprintf(defaultStream::error_stream(), 2947 "Green threads support not available\n"); 2948 return JNI_EINVAL; 2949 // -native 2950 } else if (match_option(option, "-native")) { 2951 // HotSpot always uses native threads, ignore silently for compatibility 2952 // -Xsqnopause 2953 } else if (match_option(option, "-Xsqnopause")) { 2954 // EVM option, ignore silently for compatibility 2955 // -Xrs 2956 } else if (match_option(option, "-Xrs")) { 2957 // Classic/EVM option, new functionality 2958 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2959 } else if (match_option(option, "-Xusealtsigs")) { 2960 // change default internal VM signals used - lower case for back compat 2961 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2962 // -Xoptimize 2963 } else if (match_option(option, "-Xoptimize")) { 2964 // EVM option, ignore silently for compatibility 2965 // -Xprof 2966 } else if (match_option(option, "-Xprof")) { 2967#if INCLUDE_FPROF 2968 _has_profile = true; 2969#else // INCLUDE_FPROF 2970 jio_fprintf(defaultStream::error_stream(), 2971 "Flat profiling is not supported in this VM.\n"); 2972 return JNI_ERR; 2973#endif // INCLUDE_FPROF 2974 // -Xconcurrentio 2975 } else if (match_option(option, "-Xconcurrentio")) { 2976 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2977 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2978 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2979 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2980 FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2981 2982 // -Xinternalversion 2983 } else if (match_option(option, "-Xinternalversion")) { 2984 jio_fprintf(defaultStream::output_stream(), "%s\n", 2985 VM_Version::internal_vm_info_string()); 2986 vm_exit(0); 2987#ifndef PRODUCT 2988 // -Xprintflags 2989 } else if (match_option(option, "-Xprintflags")) { 2990 CommandLineFlags::printFlags(tty, false); 2991 vm_exit(0); 2992#endif 2993 // -D 2994 } else if (match_option(option, "-D", &tail)) { 2995 const char* value; 2996 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2997 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2998 // abort if -Djava.endorsed.dirs is set 2999 jio_fprintf(defaultStream::output_stream(), 3000 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 3001 "in modular form will be supported via the concept of upgradeable modules.\n", value); 3002 return JNI_EINVAL; 3003 } 3004 if (match_option(option, "-Djava.ext.dirs=", &value) && 3005 *value != '\0' && strcmp(value, "\"\"") != 0) { 3006 // abort if -Djava.ext.dirs is set 3007 jio_fprintf(defaultStream::output_stream(), 3008 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 3009 return JNI_EINVAL; 3010 } 3011 3012 if (!add_property(tail)) { 3013 return JNI_ENOMEM; 3014 } 3015 // Out of the box management support 3016 if (match_option(option, "-Dcom.sun.management", &tail)) { 3017#if INCLUDE_MANAGEMENT 3018 FLAG_SET_CMDLINE(bool, ManagementServer, true); 3019#else 3020 jio_fprintf(defaultStream::output_stream(), 3021 "-Dcom.sun.management is not supported in this VM.\n"); 3022 return JNI_ERR; 3023#endif 3024 } 3025 // -Xint 3026 } else if (match_option(option, "-Xint")) { 3027 set_mode_flags(_int); 3028 // -Xmixed 3029 } else if (match_option(option, "-Xmixed")) { 3030 set_mode_flags(_mixed); 3031 // -Xcomp 3032 } else if (match_option(option, "-Xcomp")) { 3033 // for testing the compiler; turn off all flags that inhibit compilation 3034 set_mode_flags(_comp); 3035 // -Xshare:dump 3036 } else if (match_option(option, "-Xshare:dump")) { 3037 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 3038 set_mode_flags(_int); // Prevent compilation, which creates objects 3039 // -Xshare:on 3040 } else if (match_option(option, "-Xshare:on")) { 3041 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3042 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3043 // -Xshare:auto 3044 } else if (match_option(option, "-Xshare:auto")) { 3045 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3046 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3047 // -Xshare:off 3048 } else if (match_option(option, "-Xshare:off")) { 3049 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 3050 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3051 // -Xverify 3052 } else if (match_option(option, "-Xverify", &tail)) { 3053 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3054 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 3055 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3056 } else if (strcmp(tail, ":remote") == 0) { 3057 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3058 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3059 } else if (strcmp(tail, ":none") == 0) { 3060 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3061 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 3062 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3063 return JNI_EINVAL; 3064 } 3065 // -Xdebug 3066 } else if (match_option(option, "-Xdebug")) { 3067 // note this flag has been used, then ignore 3068 set_xdebug_mode(true); 3069 // -Xnoagent 3070 } else if (match_option(option, "-Xnoagent")) { 3071 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3072 } else if (match_option(option, "-Xboundthreads")) { 3073 // Bind user level threads to kernel threads (Solaris only) 3074 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 3075 } else if (match_option(option, "-Xloggc:", &tail)) { 3076 // Redirect GC output to the file. -Xloggc:<filename> 3077 // ostream_init_log(), when called will use this filename 3078 // to initialize a fileStream. 3079 _gc_log_filename = os::strdup_check_oom(tail); 3080 if (!is_filename_valid(_gc_log_filename)) { 3081 jio_fprintf(defaultStream::output_stream(), 3082 "Invalid file name for use with -Xloggc: Filename can only contain the " 3083 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 3084 "Note %%p or %%t can only be used once\n", _gc_log_filename); 3085 return JNI_EINVAL; 3086 } 3087 FLAG_SET_CMDLINE(bool, PrintGC, true); 3088 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 3089 3090 // JNI hooks 3091 } else if (match_option(option, "-Xcheck", &tail)) { 3092 if (!strcmp(tail, ":jni")) { 3093#if !INCLUDE_JNI_CHECK 3094 warning("JNI CHECKING is not supported in this VM"); 3095#else 3096 CheckJNICalls = true; 3097#endif // INCLUDE_JNI_CHECK 3098 } else if (is_bad_option(option, args->ignoreUnrecognized, 3099 "check")) { 3100 return JNI_EINVAL; 3101 } 3102 } else if (match_option(option, "vfprintf")) { 3103 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3104 } else if (match_option(option, "exit")) { 3105 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3106 } else if (match_option(option, "abort")) { 3107 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3108 // -XX:+AggressiveHeap 3109 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3110 3111 // This option inspects the machine and attempts to set various 3112 // parameters to be optimal for long-running, memory allocation 3113 // intensive jobs. It is intended for machines with large 3114 // amounts of cpu and memory. 3115 3116 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 3117 // VM, but we may not be able to represent the total physical memory 3118 // available (like having 8gb of memory on a box but using a 32bit VM). 3119 // Thus, we need to make sure we're using a julong for intermediate 3120 // calculations. 3121 julong initHeapSize; 3122 julong total_memory = os::physical_memory(); 3123 3124 if (total_memory < (julong)256*M) { 3125 jio_fprintf(defaultStream::error_stream(), 3126 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 3127 vm_exit(1); 3128 } 3129 3130 // The heap size is half of available memory, or (at most) 3131 // all of possible memory less 160mb (leaving room for the OS 3132 // when using ISM). This is the maximum; because adaptive sizing 3133 // is turned on below, the actual space used may be smaller. 3134 3135 initHeapSize = MIN2(total_memory / (julong)2, 3136 total_memory - (julong)160*M); 3137 3138 initHeapSize = limit_by_allocatable_memory(initHeapSize); 3139 3140 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 3141 FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize); 3142 FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize); 3143 // Currently the minimum size and the initial heap sizes are the same. 3144 set_min_heap_size(initHeapSize); 3145 } 3146 if (FLAG_IS_DEFAULT(NewSize)) { 3147 // Make the young generation 3/8ths of the total heap. 3148 FLAG_SET_CMDLINE(size_t, NewSize, 3149 ((julong)MaxHeapSize / (julong)8) * (julong)3); 3150 FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize); 3151 } 3152 3153#ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3154 FLAG_SET_DEFAULT(UseLargePages, true); 3155#endif 3156 3157 // Increase some data structure sizes for efficiency 3158 FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize); 3159 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3160 FLAG_SET_CMDLINE(size_t, TLABSize, 256*K); 3161 3162 // See the OldPLABSize comment below, but replace 'after promotion' 3163 // with 'after copying'. YoungPLABSize is the size of the survivor 3164 // space per-gc-thread buffers. The default is 4kw. 3165 FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256*K); // Note: this is in words 3166 3167 // OldPLABSize is the size of the buffers in the old gen that 3168 // UseParallelGC uses to promote live data that doesn't fit in the 3169 // survivor spaces. At any given time, there's one for each gc thread. 3170 // The default size is 1kw. These buffers are rarely used, since the 3171 // survivor spaces are usually big enough. For specjbb, however, there 3172 // are occasions when there's lots of live data in the young gen 3173 // and we end up promoting some of it. We don't have a definite 3174 // explanation for why bumping OldPLABSize helps, but the theory 3175 // is that a bigger PLAB results in retaining something like the 3176 // original allocation order after promotion, which improves mutator 3177 // locality. A minor effect may be that larger PLABs reduce the 3178 // number of PLAB allocation events during gc. The value of 8kw 3179 // was arrived at by experimenting with specjbb. 3180 FLAG_SET_CMDLINE(size_t, OldPLABSize, 8*K); // Note: this is in words 3181 3182 // Enable parallel GC and adaptive generation sizing 3183 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 3184 FLAG_SET_DEFAULT(ParallelGCThreads, 3185 Abstract_VM_Version::parallel_worker_threads()); 3186 3187 // Encourage steady state memory management 3188 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 3189 3190 // This appears to improve mutator locality 3191 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3192 3193 // Get around early Solaris scheduling bug 3194 // (affinity vs other jobs on system) 3195 // but disallow DR and offlining (5008695). 3196 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 3197 3198 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3199 // and the last option wins. 3200 } else if (match_option(option, "-XX:+NeverTenure")) { 3201 FLAG_SET_CMDLINE(bool, NeverTenure, true); 3202 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3203 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1); 3204 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3205 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3206 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3207 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 3208 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3209 uintx max_tenuring_thresh = 0; 3210 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3211 jio_fprintf(defaultStream::error_stream(), 3212 "Invalid MaxTenuringThreshold: %s\n", option->optionString); 3213 } 3214 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh); 3215 3216 if (MaxTenuringThreshold == 0) { 3217 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3218 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3219 } else { 3220 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3221 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3222 } 3223 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3224 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3225 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3226 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3227 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3228 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3229 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3230#if defined(DTRACE_ENABLED) 3231 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3232 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3233 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3234 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3235#else // defined(DTRACE_ENABLED) 3236 jio_fprintf(defaultStream::error_stream(), 3237 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3238 return JNI_EINVAL; 3239#endif // defined(DTRACE_ENABLED) 3240#ifdef ASSERT 3241 } else if (match_option(option, "-XX:+FullGCALot")) { 3242 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3243 // disable scavenge before parallel mark-compact 3244 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3245#endif 3246 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3247 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3248 julong stack_size = 0; 3249 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3250 if (errcode != arg_in_range) { 3251 jio_fprintf(defaultStream::error_stream(), 3252 "Invalid mark stack size: %s\n", option->optionString); 3253 describe_range_error(errcode); 3254 return JNI_EINVAL; 3255 } 3256 jio_fprintf(defaultStream::error_stream(), 3257 "Please use -XX:MarkStackSize in place of " 3258 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n"); 3259 FLAG_SET_CMDLINE(size_t, MarkStackSize, stack_size); 3260 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3261 julong max_stack_size = 0; 3262 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3263 if (errcode != arg_in_range) { 3264 jio_fprintf(defaultStream::error_stream(), 3265 "Invalid maximum mark stack size: %s\n", 3266 option->optionString); 3267 describe_range_error(errcode); 3268 return JNI_EINVAL; 3269 } 3270 jio_fprintf(defaultStream::error_stream(), 3271 "Please use -XX:MarkStackSizeMax in place of " 3272 "-XX:CMSMarkStackSizeMax in the future\n"); 3273 FLAG_SET_CMDLINE(size_t, MarkStackSizeMax, max_stack_size); 3274 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3275 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3276 uintx conc_threads = 0; 3277 if (!parse_uintx(tail, &conc_threads, 1)) { 3278 jio_fprintf(defaultStream::error_stream(), 3279 "Invalid concurrent threads: %s\n", option->optionString); 3280 return JNI_EINVAL; 3281 } 3282 jio_fprintf(defaultStream::error_stream(), 3283 "Please use -XX:ConcGCThreads in place of " 3284 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n"); 3285 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3286 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3287 julong max_direct_memory_size = 0; 3288 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3289 if (errcode != arg_in_range) { 3290 jio_fprintf(defaultStream::error_stream(), 3291 "Invalid maximum direct memory size: %s\n", 3292 option->optionString); 3293 describe_range_error(errcode); 3294 return JNI_EINVAL; 3295 } 3296 FLAG_SET_CMDLINE(size_t, MaxDirectMemorySize, max_direct_memory_size); 3297#if !INCLUDE_MANAGEMENT 3298 } else if (match_option(option, "-XX:+ManagementServer")) { 3299 jio_fprintf(defaultStream::error_stream(), 3300 "ManagementServer is not supported in this VM.\n"); 3301 return JNI_ERR; 3302#endif // INCLUDE_MANAGEMENT 3303 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3304 // Skip -XX:Flags= since that case has already been handled 3305 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3306 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3307 return JNI_EINVAL; 3308 } 3309 } 3310 // Unknown option 3311 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3312 return JNI_ERR; 3313 } 3314 } 3315 3316 // PrintSharedArchiveAndExit will turn on 3317 // -Xshare:on 3318 // -XX:+TraceClassPaths 3319 if (PrintSharedArchiveAndExit) { 3320 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3321 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3322 FLAG_SET_CMDLINE(bool, TraceClassPaths, true); 3323 } 3324 3325 // Change the default value for flags which have different default values 3326 // when working with older JDKs. 3327#ifdef LINUX 3328 if (JDK_Version::current().compare_major(6) <= 0 && 3329 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3330 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3331 } 3332#endif // LINUX 3333 fix_appclasspath(); 3334 return JNI_OK; 3335} 3336 3337// Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3338// 3339// This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3340// in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3341// Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3342// path is treated as the current directory. 3343// 3344// This causes problems with CDS, which requires that all directories specified in the classpath 3345// must be empty. In most cases, applications do NOT want to load classes from the current 3346// directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3347// scripts compatible with CDS. 3348void Arguments::fix_appclasspath() { 3349 if (IgnoreEmptyClassPaths) { 3350 const char separator = *os::path_separator(); 3351 const char* src = _java_class_path->value(); 3352 3353 // skip over all the leading empty paths 3354 while (*src == separator) { 3355 src ++; 3356 } 3357 3358 char* copy = AllocateHeap(strlen(src) + 1, mtInternal); 3359 strncpy(copy, src, strlen(src) + 1); 3360 3361 // trim all trailing empty paths 3362 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3363 *tail = '\0'; 3364 } 3365 3366 char from[3] = {separator, separator, '\0'}; 3367 char to [2] = {separator, '\0'}; 3368 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3369 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3370 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3371 } 3372 3373 _java_class_path->set_value(copy); 3374 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3375 } 3376 3377 if (!PrintSharedArchiveAndExit) { 3378 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value()); 3379 } 3380} 3381 3382static bool has_jar_files(const char* directory) { 3383 DIR* dir = os::opendir(directory); 3384 if (dir == NULL) return false; 3385 3386 struct dirent *entry; 3387 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 3388 bool hasJarFile = false; 3389 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3390 const char* name = entry->d_name; 3391 const char* ext = name + strlen(name) - 4; 3392 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3393 } 3394 FREE_C_HEAP_ARRAY(char, dbuf); 3395 os::closedir(dir); 3396 return hasJarFile ; 3397} 3398 3399static int check_non_empty_dirs(const char* path) { 3400 const char separator = *os::path_separator(); 3401 const char* const end = path + strlen(path); 3402 int nonEmptyDirs = 0; 3403 while (path < end) { 3404 const char* tmp_end = strchr(path, separator); 3405 if (tmp_end == NULL) { 3406 if (has_jar_files(path)) { 3407 nonEmptyDirs++; 3408 jio_fprintf(defaultStream::output_stream(), 3409 "Non-empty directory: %s\n", path); 3410 } 3411 path = end; 3412 } else { 3413 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 3414 memcpy(dirpath, path, tmp_end - path); 3415 dirpath[tmp_end - path] = '\0'; 3416 if (has_jar_files(dirpath)) { 3417 nonEmptyDirs++; 3418 jio_fprintf(defaultStream::output_stream(), 3419 "Non-empty directory: %s\n", dirpath); 3420 } 3421 FREE_C_HEAP_ARRAY(char, dirpath); 3422 path = tmp_end + 1; 3423 } 3424 } 3425 return nonEmptyDirs; 3426} 3427 3428jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3429 // check if the default lib/endorsed directory exists; if so, error 3430 char path[JVM_MAXPATHLEN]; 3431 const char* fileSep = os::file_separator(); 3432 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3433 3434 if (CheckEndorsedAndExtDirs) { 3435 int nonEmptyDirs = 0; 3436 // check endorsed directory 3437 nonEmptyDirs += check_non_empty_dirs(path); 3438 // check the extension directories 3439 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3440 if (nonEmptyDirs > 0) { 3441 return JNI_ERR; 3442 } 3443 } 3444 3445 DIR* dir = os::opendir(path); 3446 if (dir != NULL) { 3447 jio_fprintf(defaultStream::output_stream(), 3448 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3449 "in modular form will be supported via the concept of upgradeable modules.\n"); 3450 os::closedir(dir); 3451 return JNI_ERR; 3452 } 3453 3454 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3455 dir = os::opendir(path); 3456 if (dir != NULL) { 3457 jio_fprintf(defaultStream::output_stream(), 3458 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3459 "Use -classpath instead.\n."); 3460 os::closedir(dir); 3461 return JNI_ERR; 3462 } 3463 3464 if (scp_assembly_required) { 3465 // Assemble the bootclasspath elements into the final path. 3466 Arguments::set_sysclasspath(scp_p->combined_path()); 3467 } 3468 3469 // This must be done after all arguments have been processed. 3470 // java_compiler() true means set to "NONE" or empty. 3471 if (java_compiler() && !xdebug_mode()) { 3472 // For backwards compatibility, we switch to interpreted mode if 3473 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3474 // not specified. 3475 set_mode_flags(_int); 3476 } 3477 3478 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3479 // but like -Xint, leave compilation thresholds unaffected. 3480 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3481 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3482 set_mode_flags(_int); 3483 } 3484 3485 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3486 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3487 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3488 } 3489 3490#ifndef COMPILER2 3491 // Don't degrade server performance for footprint 3492 if (FLAG_IS_DEFAULT(UseLargePages) && 3493 MaxHeapSize < LargePageHeapSizeThreshold) { 3494 // No need for large granularity pages w/small heaps. 3495 // Note that large pages are enabled/disabled for both the 3496 // Java heap and the code cache. 3497 FLAG_SET_DEFAULT(UseLargePages, false); 3498 } 3499 3500#else 3501 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3502 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3503 } 3504#endif 3505 3506#ifndef TIERED 3507 // Tiered compilation is undefined. 3508 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3509#endif 3510 3511 // If we are running in a headless jre, force java.awt.headless property 3512 // to be true unless the property has already been set. 3513 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3514 if (os::is_headless_jre()) { 3515 const char* headless = Arguments::get_property("java.awt.headless"); 3516 if (headless == NULL) { 3517 char envbuffer[128]; 3518 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3519 if (!add_property("java.awt.headless=true")) { 3520 return JNI_ENOMEM; 3521 } 3522 } else { 3523 char buffer[256]; 3524 strcpy(buffer, "java.awt.headless="); 3525 strcat(buffer, envbuffer); 3526 if (!add_property(buffer)) { 3527 return JNI_ENOMEM; 3528 } 3529 } 3530 } 3531 } 3532 3533 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) { 3534 // CMS can only be used with ParNew 3535 FLAG_SET_ERGO(bool, UseParNewGC, true); 3536 } 3537 3538 if (!check_vm_args_consistency()) { 3539 return JNI_ERR; 3540 } 3541 3542 return JNI_OK; 3543} 3544 3545jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3546 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3547 scp_assembly_required_p); 3548} 3549 3550jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3551 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3552 scp_assembly_required_p); 3553} 3554 3555jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3556 const int N_MAX_OPTIONS = 64; 3557 const int OPTION_BUFFER_SIZE = 1024; 3558 char buffer[OPTION_BUFFER_SIZE]; 3559 3560 // The variable will be ignored if it exceeds the length of the buffer. 3561 // Don't check this variable if user has special privileges 3562 // (e.g. unix su command). 3563 if (os::getenv(name, buffer, sizeof(buffer)) && 3564 !os::have_special_privileges()) { 3565 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3566 jio_fprintf(defaultStream::error_stream(), 3567 "Picked up %s: %s\n", name, buffer); 3568 char* rd = buffer; // pointer to the input string (rd) 3569 int i; 3570 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3571 while (isspace(*rd)) rd++; // skip whitespace 3572 if (*rd == 0) break; // we re done when the input string is read completely 3573 3574 // The output, option string, overwrites the input string. 3575 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3576 // input string (rd). 3577 char* wrt = rd; 3578 3579 options[i++].optionString = wrt; // Fill in option 3580 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3581 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3582 int quote = *rd; // matching quote to look for 3583 rd++; // don't copy open quote 3584 while (*rd != quote) { // include everything (even spaces) up until quote 3585 if (*rd == 0) { // string termination means unmatched string 3586 jio_fprintf(defaultStream::error_stream(), 3587 "Unmatched quote in %s\n", name); 3588 return JNI_ERR; 3589 } 3590 *wrt++ = *rd++; // copy to option string 3591 } 3592 rd++; // don't copy close quote 3593 } else { 3594 *wrt++ = *rd++; // copy to option string 3595 } 3596 } 3597 // Need to check if we're done before writing a NULL, 3598 // because the write could be to the byte that rd is pointing to. 3599 if (*rd++ == 0) { 3600 *wrt = 0; 3601 break; 3602 } 3603 *wrt = 0; // Zero terminate option 3604 } 3605 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3606 JavaVMInitArgs vm_args; 3607 vm_args.version = JNI_VERSION_1_2; 3608 vm_args.options = options; 3609 vm_args.nOptions = i; 3610 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3611 3612 if (PrintVMOptions) { 3613 const char* tail; 3614 for (int i = 0; i < vm_args.nOptions; i++) { 3615 const JavaVMOption *option = vm_args.options + i; 3616 if (match_option(option, "-XX:", &tail)) { 3617 logOption(tail); 3618 } 3619 } 3620 } 3621 3622 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR)); 3623 } 3624 return JNI_OK; 3625} 3626 3627void Arguments::set_shared_spaces_flags() { 3628 if (DumpSharedSpaces) { 3629 if (RequireSharedSpaces) { 3630 warning("cannot dump shared archive while using shared archive"); 3631 } 3632 UseSharedSpaces = false; 3633#ifdef _LP64 3634 if (!UseCompressedOops || !UseCompressedClassPointers) { 3635 vm_exit_during_initialization( 3636 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3637 } 3638 } else { 3639 if (!UseCompressedOops || !UseCompressedClassPointers) { 3640 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3641 } 3642#endif 3643 } 3644} 3645 3646#if !INCLUDE_ALL_GCS 3647static void force_serial_gc() { 3648 FLAG_SET_DEFAULT(UseSerialGC, true); 3649 UNSUPPORTED_GC_OPTION(UseG1GC); 3650 UNSUPPORTED_GC_OPTION(UseParallelGC); 3651 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3652 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3653 UNSUPPORTED_GC_OPTION(UseParNewGC); 3654} 3655#endif // INCLUDE_ALL_GCS 3656 3657// Sharing support 3658// Construct the path to the archive 3659static char* get_shared_archive_path() { 3660 char *shared_archive_path; 3661 if (SharedArchiveFile == NULL) { 3662 char jvm_path[JVM_MAXPATHLEN]; 3663 os::jvm_path(jvm_path, sizeof(jvm_path)); 3664 char *end = strrchr(jvm_path, *os::file_separator()); 3665 if (end != NULL) *end = '\0'; 3666 size_t jvm_path_len = strlen(jvm_path); 3667 size_t file_sep_len = strlen(os::file_separator()); 3668 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3669 file_sep_len + 20, mtInternal); 3670 if (shared_archive_path != NULL) { 3671 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3672 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3673 strncat(shared_archive_path, "classes.jsa", 11); 3674 } 3675 } else { 3676 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3677 if (shared_archive_path != NULL) { 3678 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3679 } 3680 } 3681 return shared_archive_path; 3682} 3683 3684#ifndef PRODUCT 3685// Determine whether LogVMOutput should be implicitly turned on. 3686static bool use_vm_log() { 3687 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3688 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3689 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3690 PrintAssembly || TraceDeoptimization || TraceDependencies || 3691 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3692 return true; 3693 } 3694 3695#ifdef COMPILER1 3696 if (PrintC1Statistics) { 3697 return true; 3698 } 3699#endif // COMPILER1 3700 3701#ifdef COMPILER2 3702 if (PrintOptoAssembly || PrintOptoStatistics) { 3703 return true; 3704 } 3705#endif // COMPILER2 3706 3707 return false; 3708} 3709#endif // PRODUCT 3710 3711// Parse entry point called from JNI_CreateJavaVM 3712 3713jint Arguments::parse(const JavaVMInitArgs* args) { 3714 3715 // Remaining part of option string 3716 const char* tail; 3717 3718 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3719 const char* hotspotrc = ".hotspotrc"; 3720 bool settings_file_specified = false; 3721 bool needs_hotspotrc_warning = false; 3722 3723 const char* flags_file; 3724 int index; 3725 for (index = 0; index < args->nOptions; index++) { 3726 const JavaVMOption *option = args->options + index; 3727 if (ArgumentsExt::process_options(option)) { 3728 continue; 3729 } 3730 if (match_option(option, "-XX:Flags=", &tail)) { 3731 flags_file = tail; 3732 settings_file_specified = true; 3733 continue; 3734 } 3735 if (match_option(option, "-XX:+PrintVMOptions")) { 3736 PrintVMOptions = true; 3737 continue; 3738 } 3739 if (match_option(option, "-XX:-PrintVMOptions")) { 3740 PrintVMOptions = false; 3741 continue; 3742 } 3743 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3744 IgnoreUnrecognizedVMOptions = true; 3745 continue; 3746 } 3747 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3748 IgnoreUnrecognizedVMOptions = false; 3749 continue; 3750 } 3751 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3752 CommandLineFlags::printFlags(tty, false); 3753 vm_exit(0); 3754 } 3755#if INCLUDE_NMT 3756 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3757 // The launcher did not setup nmt environment variable properly. 3758 if (!MemTracker::check_launcher_nmt_support(tail)) { 3759 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3760 } 3761 3762 // Verify if nmt option is valid. 3763 if (MemTracker::verify_nmt_option()) { 3764 // Late initialization, still in single-threaded mode. 3765 if (MemTracker::tracking_level() >= NMT_summary) { 3766 MemTracker::init(); 3767 } 3768 } else { 3769 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3770 } 3771 continue; 3772 } 3773#endif 3774 3775 3776#ifndef PRODUCT 3777 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3778 CommandLineFlags::printFlags(tty, true); 3779 vm_exit(0); 3780 } 3781#endif 3782 } 3783 3784 if (IgnoreUnrecognizedVMOptions) { 3785 // uncast const to modify the flag args->ignoreUnrecognized 3786 *(jboolean*)(&args->ignoreUnrecognized) = true; 3787 } 3788 3789 // Parse specified settings file 3790 if (settings_file_specified) { 3791 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3792 return JNI_EINVAL; 3793 } 3794 } else { 3795#ifdef ASSERT 3796 // Parse default .hotspotrc settings file 3797 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3798 return JNI_EINVAL; 3799 } 3800#else 3801 struct stat buf; 3802 if (os::stat(hotspotrc, &buf) == 0) { 3803 needs_hotspotrc_warning = true; 3804 } 3805#endif 3806 } 3807 3808 if (PrintVMOptions) { 3809 for (index = 0; index < args->nOptions; index++) { 3810 const JavaVMOption *option = args->options + index; 3811 if (match_option(option, "-XX:", &tail)) { 3812 logOption(tail); 3813 } 3814 } 3815 } 3816 3817 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3818 jint result = parse_vm_init_args(args); 3819 if (result != JNI_OK) { 3820 return result; 3821 } 3822 3823 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3824 SharedArchivePath = get_shared_archive_path(); 3825 if (SharedArchivePath == NULL) { 3826 return JNI_ENOMEM; 3827 } 3828 3829 // Set up VerifySharedSpaces 3830 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 3831 VerifySharedSpaces = true; 3832 } 3833 3834 // Delay warning until here so that we've had a chance to process 3835 // the -XX:-PrintWarnings flag 3836 if (needs_hotspotrc_warning) { 3837 warning("%s file is present but has been ignored. " 3838 "Run with -XX:Flags=%s to load the file.", 3839 hotspotrc, hotspotrc); 3840 } 3841 3842#ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3843 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3844#endif 3845 3846 ArgumentsExt::report_unsupported_options(); 3847 3848#ifndef PRODUCT 3849 if (TraceBytecodesAt != 0) { 3850 TraceBytecodes = true; 3851 } 3852 if (CountCompiledCalls) { 3853 if (UseCounterDecay) { 3854 warning("UseCounterDecay disabled because CountCalls is set"); 3855 UseCounterDecay = false; 3856 } 3857 } 3858#endif // PRODUCT 3859 3860 if (ScavengeRootsInCode == 0) { 3861 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3862 warning("forcing ScavengeRootsInCode non-zero"); 3863 } 3864 ScavengeRootsInCode = 1; 3865 } 3866 3867 if (PrintGCDetails) { 3868 // Turn on -verbose:gc options as well 3869 PrintGC = true; 3870 } 3871 3872 // Set object alignment values. 3873 set_object_alignment(); 3874 3875#if !INCLUDE_ALL_GCS 3876 force_serial_gc(); 3877#endif // INCLUDE_ALL_GCS 3878#if !INCLUDE_CDS 3879 if (DumpSharedSpaces || RequireSharedSpaces) { 3880 jio_fprintf(defaultStream::error_stream(), 3881 "Shared spaces are not supported in this VM\n"); 3882 return JNI_ERR; 3883 } 3884 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3885 warning("Shared spaces are not supported in this VM"); 3886 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3887 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3888 } 3889 no_shared_spaces("CDS Disabled"); 3890#endif // INCLUDE_CDS 3891 3892 return JNI_OK; 3893} 3894 3895jint Arguments::apply_ergo() { 3896 3897 // Set flags based on ergonomics. 3898 set_ergonomics_flags(); 3899 3900 set_shared_spaces_flags(); 3901 3902 // Check the GC selections again. 3903 if (!check_gc_consistency()) { 3904 return JNI_EINVAL; 3905 } 3906 3907 if (TieredCompilation) { 3908 set_tiered_flags(); 3909 } else { 3910 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3911 if (CompilationPolicyChoice >= 2) { 3912 vm_exit_during_initialization( 3913 "Incompatible compilation policy selected", NULL); 3914 } 3915 // Scale CompileThreshold 3916 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 3917 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 3918 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 3919 } 3920 } 3921 3922#ifdef COMPILER2 3923#ifndef PRODUCT 3924 if (PrintIdealGraphLevel > 0) { 3925 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 3926 } 3927#endif 3928#endif 3929 3930 // Set heap size based on available physical memory 3931 set_heap_size(); 3932 3933 ArgumentsExt::set_gc_specific_flags(); 3934 3935 // Initialize Metaspace flags and alignments 3936 Metaspace::ergo_initialize(); 3937 3938 // Set bytecode rewriting flags 3939 set_bytecode_flags(); 3940 3941 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 3942 set_aggressive_opts_flags(); 3943 3944 // Turn off biased locking for locking debug mode flags, 3945 // which are subtly different from each other but neither works with 3946 // biased locking 3947 if (UseHeavyMonitors 3948#ifdef COMPILER1 3949 || !UseFastLocking 3950#endif // COMPILER1 3951 ) { 3952 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3953 // flag set to true on command line; warn the user that they 3954 // can't enable biased locking here 3955 warning("Biased Locking is not supported with locking debug flags" 3956 "; ignoring UseBiasedLocking flag." ); 3957 } 3958 UseBiasedLocking = false; 3959 } 3960 3961#ifdef ZERO 3962 // Clear flags not supported on zero. 3963 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3964 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3965 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3966 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3967#endif // CC_INTERP 3968 3969#ifdef COMPILER2 3970 if (!EliminateLocks) { 3971 EliminateNestedLocks = false; 3972 } 3973 if (!Inline) { 3974 IncrementalInline = false; 3975 } 3976#ifndef PRODUCT 3977 if (!IncrementalInline) { 3978 AlwaysIncrementalInline = false; 3979 } 3980#endif 3981 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 3982 // nothing to use the profiling, turn if off 3983 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 3984 } 3985#endif 3986 3987 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3988 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3989 DebugNonSafepoints = true; 3990 } 3991 3992 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3993 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3994 } 3995 3996#ifndef PRODUCT 3997 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3998 if (use_vm_log()) { 3999 LogVMOutput = true; 4000 } 4001 } 4002#endif // PRODUCT 4003 4004 if (PrintCommandLineFlags) { 4005 CommandLineFlags::printSetFlags(tty); 4006 } 4007 4008 // Apply CPU specific policy for the BiasedLocking 4009 if (UseBiasedLocking) { 4010 if (!VM_Version::use_biased_locking() && 4011 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4012 UseBiasedLocking = false; 4013 } 4014 } 4015#ifdef COMPILER2 4016 if (!UseBiasedLocking || EmitSync != 0) { 4017 UseOptoBiasInlining = false; 4018 } 4019#endif 4020 4021 return JNI_OK; 4022} 4023 4024jint Arguments::adjust_after_os() { 4025 if (UseNUMA) { 4026 if (UseParallelGC || UseParallelOldGC) { 4027 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4028 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4029 } 4030 } 4031 // UseNUMAInterleaving is set to ON for all collectors and 4032 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4033 // such as the parallel collector for Linux and Solaris will 4034 // interleave old gen and survivor spaces on top of NUMA 4035 // allocation policy for the eden space. 4036 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4037 // all platforms and ParallelGC on Windows will interleave all 4038 // of the heap spaces across NUMA nodes. 4039 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4040 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4041 } 4042 } 4043 return JNI_OK; 4044} 4045 4046int Arguments::PropertyList_count(SystemProperty* pl) { 4047 int count = 0; 4048 while(pl != NULL) { 4049 count++; 4050 pl = pl->next(); 4051 } 4052 return count; 4053} 4054 4055const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4056 assert(key != NULL, "just checking"); 4057 SystemProperty* prop; 4058 for (prop = pl; prop != NULL; prop = prop->next()) { 4059 if (strcmp(key, prop->key()) == 0) return prop->value(); 4060 } 4061 return NULL; 4062} 4063 4064const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4065 int count = 0; 4066 const char* ret_val = NULL; 4067 4068 while(pl != NULL) { 4069 if(count >= index) { 4070 ret_val = pl->key(); 4071 break; 4072 } 4073 count++; 4074 pl = pl->next(); 4075 } 4076 4077 return ret_val; 4078} 4079 4080char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4081 int count = 0; 4082 char* ret_val = NULL; 4083 4084 while(pl != NULL) { 4085 if(count >= index) { 4086 ret_val = pl->value(); 4087 break; 4088 } 4089 count++; 4090 pl = pl->next(); 4091 } 4092 4093 return ret_val; 4094} 4095 4096void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4097 SystemProperty* p = *plist; 4098 if (p == NULL) { 4099 *plist = new_p; 4100 } else { 4101 while (p->next() != NULL) { 4102 p = p->next(); 4103 } 4104 p->set_next(new_p); 4105 } 4106} 4107 4108void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 4109 if (plist == NULL) 4110 return; 4111 4112 SystemProperty* new_p = new SystemProperty(k, v, true); 4113 PropertyList_add(plist, new_p); 4114} 4115 4116void Arguments::PropertyList_add(SystemProperty *element) { 4117 PropertyList_add(&_system_properties, element); 4118} 4119 4120// This add maintains unique property key in the list. 4121void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 4122 if (plist == NULL) 4123 return; 4124 4125 // If property key exist then update with new value. 4126 SystemProperty* prop; 4127 for (prop = *plist; prop != NULL; prop = prop->next()) { 4128 if (strcmp(k, prop->key()) == 0) { 4129 if (append) { 4130 prop->append_value(v); 4131 } else { 4132 prop->set_value(v); 4133 } 4134 return; 4135 } 4136 } 4137 4138 PropertyList_add(plist, k, v); 4139} 4140 4141// Copies src into buf, replacing "%%" with "%" and "%p" with pid 4142// Returns true if all of the source pointed by src has been copied over to 4143// the destination buffer pointed by buf. Otherwise, returns false. 4144// Notes: 4145// 1. If the length (buflen) of the destination buffer excluding the 4146// NULL terminator character is not long enough for holding the expanded 4147// pid characters, it also returns false instead of returning the partially 4148// expanded one. 4149// 2. The passed in "buflen" should be large enough to hold the null terminator. 4150bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4151 char* buf, size_t buflen) { 4152 const char* p = src; 4153 char* b = buf; 4154 const char* src_end = &src[srclen]; 4155 char* buf_end = &buf[buflen - 1]; 4156 4157 while (p < src_end && b < buf_end) { 4158 if (*p == '%') { 4159 switch (*(++p)) { 4160 case '%': // "%%" ==> "%" 4161 *b++ = *p++; 4162 break; 4163 case 'p': { // "%p" ==> current process id 4164 // buf_end points to the character before the last character so 4165 // that we could write '\0' to the end of the buffer. 4166 size_t buf_sz = buf_end - b + 1; 4167 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4168 4169 // if jio_snprintf fails or the buffer is not long enough to hold 4170 // the expanded pid, returns false. 4171 if (ret < 0 || ret >= (int)buf_sz) { 4172 return false; 4173 } else { 4174 b += ret; 4175 assert(*b == '\0', "fail in copy_expand_pid"); 4176 if (p == src_end && b == buf_end + 1) { 4177 // reach the end of the buffer. 4178 return true; 4179 } 4180 } 4181 p++; 4182 break; 4183 } 4184 default : 4185 *b++ = '%'; 4186 } 4187 } else { 4188 *b++ = *p++; 4189 } 4190 } 4191 *b = '\0'; 4192 return (p == src_end); // return false if not all of the source was copied 4193} 4194