| Quellcodebibliothek Statistik Leitseite products/sources/formale Sprachen/Java/Openjdk/src/hotspot/share/runtime/ (Sun/Oracle ©) Datei vom 29.11.2022 mit Größe 147 kB |
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Quelle globals.hpp Sprache: C |
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/*
* Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_RUNTIME_GLOBALS_HPP #define SHARE_RUNTIME_GLOBALS_HPP #include "compiler/compiler_globals_pd.hpp" #include "runtime/globals_shared.hpp" #include "utilities/align.hpp" #include "utilities/globalDefinitions.hpp" #include "utilities/macros.hpp" #include CPU_HEADER(globals) #include OS_HEADER(globals) #include OS_CPU_HEADER(globals) // develop flags are settable / visible only during development and are constant in the PRODUCT // product flags are always settable / visible // notproduct flags are settable / visible only during development and are not declared in the P // develop_pd/product_pd flags are the same as develop/product, except that their default va // are specified in platform-dependent header files. // Flags must be declared with the following number of parameters: // non-pd flags: // (type, name, default_value, doc), or // (type, name, default_value, extra_attrs, doc) // pd flags: // (type, name, doc), or // (type, name, extra_attrs, doc) // A flag must be declared with one of the following types: // bool, int, uint, intx, uintx, size_t, ccstr, ccstrlist, double, or uint64_t. // The type "ccstr" and "ccstrlist" are an alias for "const char*" and is used // only in this file, because the macrology requires single-token type names. // The optional extra_attrs parameter may have one of the following values: // DIAGNOSTIC, EXPERIMENTAL, or MANAGEABLE. Currently extra_attrs can be used // only with product/product_pd flags. // // DIAGNOSTIC options are not meant for VM tuning or for product modes. // They are to be used for VM quality assurance or field diagnosis // of VM bugs. They are hidden so that users will not be encouraged to // try them as if they were VM ordinary execution options. However, they // are available in the product version of the VM. Under instruction // from support engineers, VM customers can turn them on to collect // diagnostic information about VM problems. To use a VM diagnostic // option, you must first specify +UnlockDiagnosticVMOptions. // (This master switch also affects the behavior of -Xprintflags.) // // EXPERIMENTAL flags are in support of features that are not // part of the officially supported product, but are available // for experimenting with. They could, for example, be performance // features that may not have undergone full or rigorous QA, but which may // help performance in some cases and released for experimentation // by the community of users and developers. This flag also allows one to // be able to build a fully supported product that nonetheless also // ships with some unsupported, lightly tested, experimental features. // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding // UnlockExperimentalVMOptions flag, which allows the control and // modification of the experimental flags. // // Nota bene: neither diagnostic nor experimental options should be used casually, // and they are not supported on production loads, except under explicit // direction from support engineers. // // MANAGEABLE flags are writeable external product flags. // They are dynamically writeable through the JDK management interface // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. // These flags are external exported interface (see CSR). The list of // manageable flags can be queried programmatically through the management // interface. // // A flag can be made as "manageable" only if // - the flag is defined in a CSR request as an external exported interface. // - the VM implementation supports dynamic setting of the flag. // This implies that the VM must *always* query the flag variable // and not reuse state related to the flag state at any given time. // - you want the flag to be queried programmatically by the customers. // // // range is a macro that will expand to min and max arguments for range // checking code if provided - see jvmFlagLimit.hpp // // constraint is a macro that will expand to custom function call // for constraint checking if provided - see jvmFlagLimit.hpp // Default and minimum StringTable and SymbolTable size values // Must be powers of 2 const size_t defaultStringTableSize = NOT_LP64(1024) LP64_ONLY(65536); const size_t minimumStringTableSize = 128; const size_t defaultSymbolTableSize = 32768; // 2^15 const size_t minimumSymbolTableSize = 1024; #ifdef _LP64 #define LP64_RUNTIME_FLAGS(develop, \ develop_pd, \ product, \ product_pd, \ notproduct, \ range, \ constraint) \ \ product(bool, UseCompressedOops, false, \ "Use 32-bit object references in 64-bit VM. " \ "lp64_product means flag is always constant in 32 bit VM") \ \ product(bool, UseCompressedClassPointers, false, \ "Use 32-bit class pointers in 64-bit VM. " \ "lp64_product means flag is always constant in 32 bit VM") \ \ product(int, ObjectAlignmentInBytes, 8, \ "Default object alignment in bytes, 8 is minimum") \ range(8, 256) \ constraint(ObjectAlignmentInBytesConstraintFunc, AtParse) #else // !_LP64 #define LP64_RUNTIME_FLAGS(develop, \ develop_pd, \ product, \ product_pd, \ notproduct, \ range, \ constraint) const bool UseCompressedOops = false; const bool UseCompressedClassPointers = false; const int ObjectAlignmentInBytes = 8; #endif // _LP64 #define RUNTIME_FLAGS(develop, \ develop_pd, \ product, \ product_pd, \ notproduct, \ range, \ constraint) \ \ notproduct(bool, CheckCompressedOops, true, \ "Generate checks in encoding/decoding code in debug VM") \ \ product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ "Heap allocation steps through preferred address regions to find" \ " where it can allocate the heap. Number of steps to take per " \ "region.") \ range(1, max_uintx) \ \ product(uint, HandshakeTimeout, 0, DIAGNOSTIC, \ "If nonzero set a timeout in milliseconds for handshakes") \ \ product(bool, AlwaysSafeConstructors, false, EXPERIMENTAL, \ "Force safe construction, as if all fields are final.") \ \ product(bool, UnlockDiagnosticVMOptions, trueInDebug, DIAGNOSTIC, \ "Enable normal processing of flags relating to field diagnostics")\ \ product(bool, UnlockExperimentalVMOptions, false, EXPERIMENTAL, \ "Enable normal processing of flags relating to experimental " \ "features") \ \ product(bool, JavaMonitorsInStackTrace, true, \ "Print information about Java monitor locks when the stacks are " \ "dumped") \ \ product_pd(bool, UseLargePages, \ "Use large page memory") \ \ product_pd(bool, UseLargePagesIndividualAllocation, \ "Allocate large pages individually for better affinity") \ \ develop(bool, LargePagesIndividualAllocationInjectError, false, \ "Fail large pages individual allocation") \ \ product(bool, UseNUMA, false, \ "Use NUMA if available") \ \ product(bool, UseNUMAInterleaving, false, \ "Interleave memory across NUMA nodes if available") \ \ product(size_t, NUMAInterleaveGranularity, 2*M, \ "Granularity to use for NUMA interleaving on Windows OS") \ constraint(NUMAInterleaveGranularityConstraintFunc, AtParse) \ \ product(uintx, NUMAChunkResizeWeight, 20, \ "Percentage (0-100) used to weight the current sample when " \ "computing exponentially decaying average for " \ "AdaptiveNUMAChunkSizing") \ range(0, 100) \ \ product(size_t, NUMASpaceResizeRate, 1*G, \ "Do not reallocate more than this amount per collection") \ range(0, max_uintx) \ \ product(bool, UseAdaptiveNUMAChunkSizing, true, \ "Enable adaptive chunk sizing for NUMA") \ \ product(bool, NUMAStats, false, \ "Print NUMA stats in detailed heap information") \ \ product(uintx, NUMAPageScanRate, 256, \ "Maximum number of pages to include in the page scan procedure") \ range(0, max_uintx) \ \ product(bool, UseAES, false, \ "Control whether AES instructions are used when available") \ \ product(bool, UseFMA, false, \ "Control whether FMA instructions are used when available") \ \ product(bool, UseSHA, false, \ "Control whether SHA instructions are used when available") \ \ product(bool, UseGHASHIntrinsics, false, DIAGNOSTIC, \ "Use intrinsics for GHASH versions of crypto") \ \ product(bool, UseBASE64Intrinsics, false, \ "Use intrinsics for java.util.Base64") \ \ product(bool, UsePoly1305Intrinsics, false, DIAGNOSTIC, \ "Use intrinsics for sun.security.util.math.intpoly") \ \ product(size_t, LargePageSizeInBytes, 0, \ "Maximum large page size used (0 will use the default large " \ "page size for the environment as the maximum)") \ range(0, max_uintx) \ \ product(size_t, LargePageHeapSizeThreshold, 128*M, \ "Use large pages if maximum heap is at least this big") \ range(0, max_uintx) \ \ product(bool, ForceTimeHighResolution, false, \ "Using high time resolution (for Win32 only)") \ \ develop(bool, TracePcPatching, false, \ "Trace usage of frame::patch_pc") \ \ develop(bool, TraceRelocator, false, \ "Trace the bytecode relocator") \ \ \ product(bool, SafepointALot, false, DIAGNOSTIC, \ "Generate a lot of safepoints. This works with " \ "GuaranteedSafepointInterval") \ \ product(bool, HandshakeALot, false, DIAGNOSTIC, \ "Generate a lot of handshakes. This works with " \ "GuaranteedSafepointInterval") \ \ product_pd(bool, BackgroundCompilation, \ "A thread requesting compilation is not blocked during " \ "compilation") \ \ product(bool, MethodFlushing, true, \ "Reclamation of compiled methods") \ \ develop(bool, VerifyStack, false, \ "Verify stack of each thread when it is entering a runtime call") \ \ product(bool, ForceUnreachable, false, DIAGNOSTIC, \ "Make all non code cache addresses to be unreachable by " \ "forcing use of 64bit literal fixups") \ \ develop(bool, TraceDerivedPointers, false, \ "Trace traversal of derived pointers on stack") \ \ notproduct(bool, TraceCodeBlobStacks, false, \ "Trace stack-walk of codeblobs") \ \ notproduct(bool, PrintRewrites, false, \ "Print methods that are being rewritten") \ \ product(bool, UseInlineCaches, true, \ "Use Inline Caches for virtual calls ") \ \ product(bool, InlineArrayCopy, true, DIAGNOSTIC, \ "Inline arraycopy native that is known to be part of " \ "base library DLL") \ \ product(bool, InlineObjectHash, true, DIAGNOSTIC, \ "Inline Object::hashCode() native that is known to be part " \ "of base library DLL") \ \ product(bool, InlineNatives, true, DIAGNOSTIC, \ "Inline natives that are known to be part of base library DLL") \ \ product(bool, InlineMathNatives, true, DIAGNOSTIC, \ "Inline SinD, CosD, etc.") \ \ product(bool, InlineClassNatives, true, DIAGNOSTIC, \ "Inline Class.isInstance, etc") \ \ product(bool, InlineThreadNatives, true, DIAGNOSTIC, \ "Inline Thread.currentThread, etc") \ \ product(bool, InlineUnsafeOps, true, DIAGNOSTIC, \ "Inline memory ops (native methods) from Unsafe") \ \ product(bool, UseAESIntrinsics, false, DIAGNOSTIC, \ "Use intrinsics for AES versions of crypto") \ \ product(bool, UseAESCTRIntrinsics, false, DIAGNOSTIC, \ "Use intrinsics for the paralleled version of AES/CTR crypto") \ \ product(bool, UseChaCha20Intrinsics, false, DIAGNOSTIC, \ "Use intrinsics for the vectorized version of ChaCha20") \ \ product(bool, UseMD5Intrinsics, false, DIAGNOSTIC, \ "Use intrinsics for MD5 crypto hash function") \ \ product(bool, UseSHA1Intrinsics, false, DIAGNOSTIC, \ "Use intrinsics for SHA-1 crypto hash function. " \ "Requires that UseSHA is enabled.") \ \ product(bool, UseSHA256Intrinsics, false, DIAGNOSTIC, \ "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ "Requires that UseSHA is enabled.") \ \ product(bool, UseSHA512Intrinsics, false, DIAGNOSTIC, \ "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ "Requires that UseSHA is enabled.") \ \ product(bool, UseSHA3Intrinsics, false, DIAGNOSTIC, \ "Use intrinsics for SHA3 crypto hash function. " \ "Requires that UseSHA is enabled.") \ \ product(bool, UseCRC32Intrinsics, false, DIAGNOSTIC, \ "use intrinsics for java.util.zip.CRC32") \ \ product(bool, UseCRC32CIntrinsics, false, DIAGNOSTIC, \ "use intrinsics for java.util.zip.CRC32C") \ \ product(bool, UseAdler32Intrinsics, false, DIAGNOSTIC, \ "use intrinsics for java.util.zip.Adler32") \ \ product(bool, UseVectorizedMismatchIntrinsic, false, DIAGNOSTIC, \ "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \ \ product(bool, UseCopySignIntrinsic, false, DIAGNOSTIC, \ "Enables intrinsification of Math.copySign") \ \ product(bool, UseSignumIntrinsic, false, DIAGNOSTIC, \ "Enables intrinsification of Math.signum") \ \ product(ccstrlist, DisableIntrinsic, "", DIAGNOSTIC, \ "do not expand intrinsics whose (internal) names appear here") \ constraint(DisableIntrinsicConstraintFunc,AfterErgo) \ \ product(ccstrlist, ControlIntrinsic, "", DIAGNOSTIC, \ "Control intrinsics using a list of +/- (internal) names, " \ "separated by commas") \ constraint(ControlIntrinsicConstraintFunc,AfterErgo) \ \ develop(bool, TraceCallFixup, false, \ "Trace all call fixups") \ \ develop(bool, DeoptimizeALot, false, \ "Deoptimize at every exit from the runtime system") \ \ notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ "A comma separated list of bcis to deoptimize at") \ \ develop(bool, DeoptimizeRandom, false, \ "Deoptimize random frames on random exit from the runtime system")\ \ notproduct(bool, ZombieALot, false, \ "Create non-entrant nmethods at exit from the runtime system") \ \ notproduct(bool, WalkStackALot, false, \ "Trace stack (no print) at every exit from the runtime system") \ \ develop(bool, DeoptimizeObjectsALot, false, \ "For testing purposes concurrent threads revert optimizations " \ "based on escape analysis at intervals given with " \ "DeoptimizeObjectsALotInterval=n. The thread count is given " \ "with DeoptimizeObjectsALotThreadCountSingle and " \ "DeoptimizeObjectsALotThreadCountAll.") \ \ develop(uint64_t, DeoptimizeObjectsALotInterval, 5, \ "Interval for DeoptimizeObjectsALot.") \ range(0, max_jlong) \ \ develop(int, DeoptimizeObjectsALotThreadCountSingle, 1, \ "The number of threads that revert optimizations based on " \ "escape analysis for a single thread if DeoptimizeObjectsALot " \ "is enabled. The target thread is selected round robin." ) \ range(0, max_jint) \ \ develop(int, DeoptimizeObjectsALotThreadCountAll, 1, \ "The number of threads that revert optimizations based on " \ "escape analysis for all threads if DeoptimizeObjectsALot " \ "is enabled." ) \ range(0, max_jint) \ \ notproduct(bool, VerifyLastFrame, false, \ "Verify oops on last frame on entry to VM") \ \ product(bool, SafepointTimeout, false, \ "Time out and warn or fail after SafepointTimeoutDelay " \ "milliseconds if failed to reach safepoint") \ \ product(bool, AbortVMOnSafepointTimeout, false, DIAGNOSTIC, \ "Abort upon failure to reach safepoint (see SafepointTimeout)") \ \ product(bool, AbortVMOnVMOperationTimeout, false, DIAGNOSTIC, \ "Abort upon failure to complete VM operation promptly") \ \ product(intx, AbortVMOnVMOperationTimeoutDelay, 1000, DIAGNOSTIC, \ "Delay in milliseconds for option AbortVMOnVMOperationTimeout") \ range(0, max_intx) \ \ product(bool, MaxFDLimit, true, \ "Bump the number of file descriptors to maximum (Unix only)") \ \ product(bool, LogEvents, true, DIAGNOSTIC, \ "Enable the various ring buffer event logs") \ \ product(uintx, LogEventsBufferEntries, 20, DIAGNOSTIC, \ "Number of ring buffer event logs") \ range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ \ product(bool, BytecodeVerificationRemote, true, DIAGNOSTIC, \ "Enable the Java bytecode verifier for remote classes") \ \ product(bool, BytecodeVerificationLocal, false, DIAGNOSTIC, \ "Enable the Java bytecode verifier for local classes") \ \ develop(bool, VerifyStackAtCalls, false, \ "Verify that the stack pointer is unchanged after calls") \ \ develop(bool, TraceJavaAssertions, false, \ "Trace java language assertions") \ \ notproduct(bool, VerifyCodeCache, false, \ "Verify code cache on memory allocation/deallocation") \ \ develop(bool, ZapResourceArea, trueInDebug, \ "Zap freed resource/arena space") \ \ notproduct(bool, ZapVMHandleArea, trueInDebug, \ "Zap freed VM handle space") \ \ notproduct(bool, ZapStackSegments, trueInDebug, \ "Zap allocated/freed stack segments") \ \ develop(bool, ZapUnusedHeapArea, trueInDebug, \ "Zap unused heap space") \ \ develop(bool, CheckZapUnusedHeapArea, false, \ "Check zapping of unused heap space") \ \ develop(bool, ZapFillerObjects, trueInDebug, \ "Zap filler objects") \ \ product(bool, ExecutingUnitTests, false, \ "Whether the JVM is running unit tests or not") \ \ develop(uint, ErrorHandlerTest, 0, \ "If > 0, provokes an error after VM initialization; the value " \ "determines which error to provoke. See controlled_crash() " \ "in vmError.cpp.") \ range(0, 17) \ \ develop(uint, TestCrashInErrorHandler, 0, \ "If > 0, provokes an error inside VM error handler (a secondary " \ "crash). see controlled_crash() in vmError.cpp") \ range(0, 17) \ \ develop(bool, TestSafeFetchInErrorHandler, false , \ "If true, tests SafeFetch inside error handler.") \ \ develop(bool, TestUnresponsiveErrorHandler, false, \ "If true, simulates an unresponsive error handler.") \ \ develop(bool, Verbose, false, \ "Print additional debugging information from other modes") \ \ develop(bool, PrintMiscellaneous, false, \ "Print uncategorized debugging information (requires +Verbose)") \ \ develop(bool, WizardMode, false, \ "Print much more debugging information") \ \ product(bool, ShowMessageBoxOnError, false, \ "Keep process alive on VM fatal error") \ \ product(bool, CreateCoredumpOnCrash, true, \ "Create core/mini dump on VM fatal error") \ \ product(uint64_t, ErrorLogTimeout, 2 * 60, \ "Timeout, in seconds, to limit the time spent on writing an " \ "error log in case of a crash.") \ range(0, (uint64_t)max_jlong/1000) \ \ product(bool, ErrorLogSecondaryErrorDetails, false, DIAGNOSTIC, \ "If enabled, show details on secondary crashes in the error log") \ \ develop(intx, TraceDwarfLevel, 0, \ "Debug levels for the dwarf parser") \ range(0, 4) \ \ product(bool, SuppressFatalErrorMessage, false, \ "Report NO fatal error message (avoid deadlock)") \ \ product(ccstrlist, OnError, "", \ "Run user-defined commands on fatal error; see VMError.cpp " \ "for examples") \ \ product(ccstrlist, OnOutOfMemoryError, "", \ "Run user-defined commands on first java.lang.OutOfMemoryError " \ "thrown from JVM") \ \ product(bool, HeapDumpBeforeFullGC, false, MANAGEABLE, \ "Dump heap to file before any major stop-the-world GC") \ \ product(bool, HeapDumpAfterFullGC, false, MANAGEABLE, \ "Dump heap to file after any major stop-the-world GC") \ \ product(bool, HeapDumpOnOutOfMemoryError, false, MANAGEABLE, \ "Dump heap to file when java.lang.OutOfMemoryError is thrown " \ "from JVM") \ \ product(ccstr, HeapDumpPath, NULL, MANAGEABLE, \ "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ "directory) of the dump file (defaults to java_pid "in the working directory)") \ \ product(intx, HeapDumpGzipLevel, 0, MANAGEABLE, \ "When HeapDumpOnOutOfMemoryError is on, the gzip compression " \ "level of the dump file. 0 (the default) disables gzip " \ "compression. Otherwise the level must be between 1 and 9.") \ range(0, 9) \ \ product(ccstr, NativeMemoryTracking, DEBUG_ONLY("summary") NOT_DEBUG("off"), \ "Native memory tracking options") \ \ product(bool, PrintNMTStatistics, false, DIAGNOSTIC, \ "Print native memory tracking summary data if it is on") \ \ product(bool, LogCompilation, false, DIAGNOSTIC, \ "Log compilation activity in detail to LogFile") \ \ product(bool, PrintCompilation, false, \ "Print compilations") \ \ product(intx, RepeatCompilation, 0, DIAGNOSTIC, \ "Repeat compilation without installing code (number of times)") \ range(0, max_jint) \ \ product(bool, PrintExtendedThreadInfo, false, \ "Print more information in thread dump") \ \ product(intx, ScavengeRootsInCode, 2, DIAGNOSTIC, \ "0: do not allow scavengable oops in the code cache; " \ "1: allow scavenging from the code cache; " \ "2: emit as many constants as the compiler can see") \ range(0, 2) \ \ product(bool, AlwaysRestoreFPU, false, \ "Restore the FPU control word after every JNI call (expensive)") \ \ product(bool, PrintCompilation2, false, DIAGNOSTIC, \ "Print additional statistics per compilation") \ \ product(bool, PrintAdapterHandlers, false, DIAGNOSTIC, \ "Print code generated for i2c/c2i adapters") \ \ product(bool, VerifyAdapterCalls, trueInDebug, DIAGNOSTIC, \ "Verify that i2c/c2i adapters are called properly") \ \ develop(bool, VerifyAdapterSharing, false, \ "Verify that the code for shared adapters is the equivalent") \ \ product(bool, PrintAssembly, false, DIAGNOSTIC, \ "Print assembly code (using external disassembler.so)") \ \ product(ccstr, PrintAssemblyOptions, NULL, DIAGNOSTIC, \ "Print options string passed to disassembler.so") \ \ notproduct(bool, PrintNMethodStatistics, false, \ "Print a summary statistic for the generated nmethods") \ \ product(bool, PrintNMethods, false, DIAGNOSTIC, \ "Print assembly code for nmethods when generated") \ \ product(bool, PrintNativeNMethods, false, DIAGNOSTIC, \ "Print assembly code for native nmethods when generated") \ \ develop(bool, PrintDebugInfo, false, \ "Print debug information for all nmethods when generated") \ \ develop(bool, PrintRelocations, false, \ "Print relocation information for all nmethods when generated") \ \ develop(bool, PrintDependencies, false, \ "Print dependency information for all nmethods when generated") \ \ develop(bool, PrintExceptionHandlers, false, \ "Print exception handler tables for all nmethods when generated") \ \ develop(bool, StressCompiledExceptionHandlers, false, \ "Exercise compiled exception handlers") \ \ develop(bool, InterceptOSException, false, \ "Start debugger when an implicit OS (e.g. NULL) " \ "exception happens") \ \ product(bool, PrintCodeCache, false, \ "Print the code cache memory usage when exiting") \ \ develop(bool, PrintCodeCache2, false, \ "Print detailed usage information on the code cache when exiting")\ \ product(bool, PrintCodeCacheOnCompilation, false, \ "Print the code cache memory usage each time a method is " \ "compiled") \ \ product(bool, PrintCodeHeapAnalytics, false, DIAGNOSTIC, \ "Print code heap usage statistics on exit and on full condition") \ \ product(bool, PrintStubCode, false, DIAGNOSTIC, \ "Print generated stub code") \ \ product(bool, StackTraceInThrowable, true, \ "Collect backtrace in throwable when exception happens") \ \ product(bool, OmitStackTraceInFastThrow, true, \ "Omit backtraces for some 'hot' exceptions in optimized code") \ \ product(bool, ShowCodeDetailsInExceptionMessages, true, MANAGEABLE, \ "Show exception messages from RuntimeExceptions that contain " \ "snippets of the failing code. Disable this to improve privacy.") \ \ product(bool, PrintWarnings, true, \ "Print JVM warnings to output stream") \ \ product(bool, RegisterFinalizersAtInit, true, \ "Register finalizable objects at end of Object. "after allocation") \ \ develop(bool, RegisterReferences, true, \ "Tell whether the VM should register soft/weak/final/phantom " \ "references") \ \ develop(bool, PrintCodeCacheExtension, false, \ "Print extension of code cache") \ \ develop(bool, UsePrivilegedStack, true, \ "Enable the security JVM functions") \ \ product(bool, ClassUnloading, true, \ "Do unloading of classes") \ \ product(bool, ClassUnloadingWithConcurrentMark, true, \ "Do unloading of classes with a concurrent marking cycle") \ \ notproduct(bool, PrintSystemDictionaryAtExit, false, \ "Print the system dictionary at exit") \ \ notproduct(bool, PrintClassLoaderDataGraphAtExit, false, \ "Print the class loader data graph at exit") \ \ product(bool, AllowParallelDefineClass, false, \ "Allow parallel defineClass requests for class loaders " \ "registering as parallel capable") \ \ product(bool, EnableWaitForParallelLoad, false, \ "(Deprecated) Enable legacy parallel classloading logic for " \ "class loaders not registered as parallel capable") \ \ product_pd(bool, DontYieldALot, \ "Throw away obvious excess yield calls") \ \ product(bool, DisablePrimordialThreadGuardPages, false, EXPERIMENTAL, \ "Disable the use of stack guard pages if the JVM is loaded " \ "on the primordial process thread") \ \ product(bool, PostVirtualThreadCompatibleLifecycleEvents, true, EXPERIMENTAL, \ "Post virtual thread ThreadStart and ThreadEnd events for " \ "virtual thread unaware agents") \ \ product(bool, DoJVMTIVirtualThreadTransitions, true, EXPERIMENTAL, \ "Do JVMTI virtual thread mount/unmount transitions " \ "(disabling this flag implies no JVMTI events are posted)") \ \ /* notice: the max range value here is max_jint, not max_intx */ \ /* because of overflow issue */ \ product(intx, AsyncDeflationInterval, 250, DIAGNOSTIC, \ "Async deflate idle monitors every so many milliseconds when " \ "MonitorUsedDeflationThreshold is exceeded (0 is off).") \ range(0, max_jint) \ \ product(size_t, AvgMonitorsPerThreadEstimate, 1024, DIAGNOSTIC, \ "Used to estimate a variable ceiling based on number of threads " \ "for use with MonitorUsedDeflationThreshold (0 is off).") \ range(0, max_uintx) \ \ /* notice: the max range value here is max_jint, not max_intx */ \ /* because of overflow issue */ \ product(intx, MonitorDeflationMax, 1000000, DIAGNOSTIC, \ "The maximum number of monitors to deflate, unlink and delete " \ "at one time (minimum is 1024).") \ range(1024, max_jint) \ \ product(intx, MonitorUsedDeflationThreshold, 90, DIAGNOSTIC, \ "Percentage of used monitors before triggering deflation (0 is " \ "off). The check is performed on GuaranteedSafepointInterval " \ "or AsyncDeflationInterval.") \ range(0, 100) \ \ product(uintx, NoAsyncDeflationProgressMax, 3, DIAGNOSTIC, \ "Max number of no progress async deflation attempts to tolerate " \ "before adjusting the in_use_list_ceiling up (0 is off).") \ range(0, max_uintx) \ \ product(intx, hashCode, 5, EXPERIMENTAL, \ "(Unstable) select hashCode generation algorithm") \ \ product(bool, ReduceSignalUsage, false, \ "Reduce the use of OS signals in Java and/or the VM") \ \ develop(bool, LoadLineNumberTables, true, \ "Tell whether the class file parser loads line number tables") \ \ develop(bool, LoadLocalVariableTables, true, \ "Tell whether the class file parser loads local variable tables") \ \ develop(bool, LoadLocalVariableTypeTables, true, \ "Tell whether the class file parser loads local variable type" \ "tables") \ \ product(bool, AllowUserSignalHandlers, false, \ "Application will install primary signal handlers for the JVM " \ "(Unix only)") \ \ product(bool, UseSignalChaining, true, \ "Use signal-chaining to invoke signal handlers installed " \ "by the application (Unix only)") \ \ product(bool, RestoreMXCSROnJNICalls, false, \ "Restore MXCSR when returning from JNI calls") \ \ product(bool, CheckJNICalls, false, \ "Verify all arguments to JNI calls") \ \ product(bool, UseFastJNIAccessors, true, \ "Use optimized versions of Get \ product(intx, MaxJNILocalCapacity, 65536, \ "Maximum allowable local JNI handle capacity to " \ "EnsureLocalCapacity() and PushLocalFrame(), " \ "where <= 0 is unlimited, default: 65536") \ range(min_intx, max_intx) \ \ product(bool, EagerXrunInit, false, \ "Eagerly initialize -Xrun libraries; allows startup profiling, " \ "but not all -Xrun libraries may support the state of the VM " \ "at this time") \ \ product(bool, PreserveAllAnnotations, false, \ "Preserve RuntimeInvisibleAnnotations as well " \ "as RuntimeVisibleAnnotations") \ \ develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ "Number of OutOfMemoryErrors preallocated with backtrace") \ \ product(bool, UseXMMForArrayCopy, false, \ "Use SSE2 MOVQ instruction for Arraycopy") \ \ notproduct(bool, PrintFieldLayout, false, \ "Print field layout for each class") \ \ /* Need to limit the extent of the padding to reasonable size. */\ /* 8K is well beyond the reasonable HW cache line size, even with */\ /* aggressive prefetching, while still leaving the room for segregating */\ /* among the distinct pages. */\ product(intx, ContendedPaddingWidth, 128, \ "How many bytes to pad the fields/classes marked @Contended with")\ range(0, 8192) \ constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ \ product(bool, EnableContended, true, \ "Enable @Contended annotation support") \ \ product(bool, RestrictContended, true, \ "Restrict @Contended to trusted classes") \ \ product(int, DiagnoseSyncOnValueBasedClasses, 0, DIAGNOSTIC, \ "Detect and take action upon identifying synchronization on " \ "value based classes. Modes: " \ "0: off; " \ "1: exit with fatal error; " \ "2: log message to stdout. Output file can be specified with " \ " -Xlog:valuebasedclasses. If JFR is running it will " \ " also generate JFR events.") \ range(0, 2) \ \ product(bool, ExitOnOutOfMemoryError, false, \ "JVM exits on the first occurrence of an out-of-memory error " \ "thrown from JVM") \ \ product(bool, CrashOnOutOfMemoryError, false, \ "JVM aborts, producing an error log and core/mini dump, on the " \ "first occurrence of an out-of-memory error thrown from JVM") \ \ /* tracing */ \ \ develop(bool, StressRewriter, false, \ "Stress linktime bytecode rewriting") \ \ product(ccstr, TraceJVMTI, NULL, \ "Trace flags for JVMTI functions and events") \ \ product(bool, StressLdcRewrite, false, DIAGNOSTIC, \ "Force ldc -> ldc_w rewrite during RedefineClasses. " \ "This option can change an EMCP method into an obsolete method " \ "and can affect tests that expect specific methods to be EMCP. " \ "This option should be used with caution.") \ \ product(bool, AllowRedefinitionToAddDeleteMethods, false, \ "(Deprecated) Allow redefinition to add and delete private " \ "static or final methods for compatibility with old releases") \ \ develop(bool, TraceBytecodes, false, \ "Trace bytecode execution") \ \ develop(bool, TraceICs, false, \ "Trace inline cache changes") \ \ notproduct(bool, TraceInvocationCounterOverflow, false, \ "Trace method invocation counter overflow") \ \ develop(bool, TraceInlineCacheClearing, false, \ "Trace clearing of inline caches in nmethods") \ \ develop(bool, TraceDependencies, false, \ "Trace dependencies") \ \ develop(bool, VerifyDependencies, trueInDebug, \ "Exercise and verify the compilation dependency mechanism") \ \ develop(bool, TraceNewOopMapGeneration, false, \ "Trace OopMapGeneration") \ \ develop(bool, TraceNewOopMapGenerationDetailed, false, \ "Trace OopMapGeneration: print detailed cell states") \ \ develop(bool, TimeOopMap, false, \ "Time calls to GenerateOopMap::compute_map() in sum") \ \ develop(bool, TimeOopMap2, false, \ "Time calls to GenerateOopMap::compute_map() individually") \ \ develop(bool, TraceOopMapRewrites, false, \ "Trace rewriting of methods during oop map generation") \ \ develop(bool, TraceICBuffer, false, \ "Trace usage of IC buffer") \ \ develop(bool, TraceCompiledIC, false, \ "Trace changes of compiled IC") \ \ develop(bool, FLSVerifyDictionary, false, \ "Do lots of (expensive) FLS dictionary verification") \ \ \ notproduct(bool, CheckMemoryInitialization, false, \ "Check memory initialization") \ \ product(uintx, ProcessDistributionStride, 4, \ "Stride through processors when distributing processes") \ --> -------------------- --> maximum size reached --> -------------------- ¤ Dauer der Verarbeitung: 0.29 Sekunden (vorverarbeitet) ¤*© Formatika GbR, Deutschland |
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2026-03-28