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jdk/src/hotspot/share/runtime/globals.hpp
Robbin Ehn 86bd44fe80 8257831: Suspend with handshakes 
Reviewed-by: dcubed, rrich, dholmes, pchilanomate, sspitsyn
2021-04-22 10:30:47 +00:00

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/*
* Copyright (c) 1997, 2021, 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 version
// product flags are always settable / visible
// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
// develop_pd/product_pd flags are the same as develop/product, except that their default values
// 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 CCC). 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 CCC 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(intx, 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 intx 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(size_t, LargePageSizeInBytes, 0, \
"Large page size (0 to let VM choose the page size)") \
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 zombie and not-entrant 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, CriticalJNINatives, false, \
"(Deprecated) Check for critical JNI entry points") \
\
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, 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 zombies (non-entrant) 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, UseMallocOnly, false, \
"Use only malloc/free for allocation (no resource area/arena)") \
\
develop(bool, ZapResourceArea, trueInDebug, \
"Zap freed resource/arena space with 0xABABABAB") \
\
notproduct(bool, ZapVMHandleArea, trueInDebug, \
"Zap freed VM handle space with 0xBCBCBCBC") \
\
notproduct(bool, ZapStackSegments, trueInDebug, \
"Zap allocated/freed stack segments with 0xFADFADED") \
\
develop(bool, ZapUnusedHeapArea, trueInDebug, \
"Zap unused heap space with 0xBAADBABE") \
\
develop(bool, CheckZapUnusedHeapArea, false, \
"Check zapping of unused heap space") \
\
develop(bool, ZapFillerObjects, trueInDebug, \
"Zap filler objects with 0xDEAFBABE") \
\
product(bool, ExecutingUnitTests, false, \
"Whether the JVM is running unit tests or not") \
\
develop(uintx, 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(uintx, 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, 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<pid>.hprof " \
"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, "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.<init> or " \
"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, DynamicallyResizeSystemDictionaries, true, DIAGNOSTIC, \
"Dynamically resize system dictionaries as needed") \
\
product(bool, AlwaysLockClassLoader, false, \
"(Deprecated) Require the VM to acquire the class loader lock " \
"before calling loadClass() even for class loaders registering " \
"as parallel capable") \
\
product(bool, AllowParallelDefineClass, false, \
"Allow parallel defineClass requests for class loaders " \
"registering 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") \
\
/* 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, EXPERIMENTAL, \
"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, FilterSpuriousWakeups, true, \
"When true prevents OS-level spurious, or premature, wakeups " \
"from Object.wait (Ignored for Windows)") \
\
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<Primitive>Field") \
\
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(bool, UseBiasedLocking, false, \
"(Deprecated) Enable biased locking in JVM") \
\
product(intx, BiasedLockingStartupDelay, 0, \
"(Deprecated) Number of milliseconds to wait before enabling " \
"biased locking") \
range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
constraint(BiasedLockingStartupDelayFunc,AfterErgo) \
\
product(bool, PrintBiasedLockingStatistics, false, DIAGNOSTIC, \
"(Deprecated) Print statistics of biased locking in JVM") \
\
product(intx, BiasedLockingBulkRebiasThreshold, 20, \
"(Deprecated) Threshold of number of revocations per type to " \
"try to rebias all objects in the heap of that type") \
range(0, max_intx) \
constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \
\
product(intx, BiasedLockingBulkRevokeThreshold, 40, \
"(Deprecated) Threshold of number of revocations per type to " \
"permanently revoke biases of all objects in the heap of that " \
"type") \
range(0, max_intx) \
constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \
\
product(intx, BiasedLockingDecayTime, 25000, \
"(Deprecated) Decay time (in milliseconds) to re-enable bulk " \
"rebiasing of a type after previous bulk rebias") \
range(500, max_intx) \
constraint(BiasedLockingDecayTimeFunc,AfterErgo) \
\
product(intx, 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") \
range(0, max_juint) \
\
develop(bool, TraceFinalizerRegistration, false, \
"Trace registration of final references") \
\
product(bool, IgnoreEmptyClassPaths, false, \
"Ignore empty path elements in -classpath") \
\
product(bool, PrintHeapAtSIGBREAK, true, \
"Print heap layout in response to SIGBREAK") \
\
product(bool, PrintClassHistogram, false, MANAGEABLE, \
"Print a histogram of class instances") \
\
product(double, ObjectCountCutOffPercent, 0.5, EXPERIMENTAL, \
"The percentage of the used heap that the instances of a class " \
"must occupy for the class to generate a trace event") \
range(0.0, 100.0) \
\
/* JVMTI heap profiling */ \
\
product(bool, VerifyBeforeIteration, false, DIAGNOSTIC, \
"Verify memory system before JVMTI iteration") \
\
/* compiler */ \
\
/* notice: the max range value here is max_jint, not max_intx */ \
/* because of overflow issue */ \
product(intx, CICompilerCount, CI_COMPILER_COUNT, \
"Number of compiler threads to run") \
range(0, max_jint) \
constraint(CICompilerCountConstraintFunc, AfterErgo) \
\
product(bool, UseDynamicNumberOfCompilerThreads, true, \
"Dynamically choose the number of parallel compiler threads") \
\
product(bool, ReduceNumberOfCompilerThreads, true, DIAGNOSTIC, \
"Reduce the number of parallel compiler threads when they " \
"are not used") \
\
product(bool, TraceCompilerThreads, false, DIAGNOSTIC, \
"Trace creation and removal of compiler threads") \
\
develop(bool, InjectCompilerCreationFailure, false, \
"Inject thread creation failures for " \
"UseDynamicNumberOfCompilerThreads") \
\
develop(bool, GenerateSynchronizationCode, true, \
"generate locking/unlocking code for synchronized methods and " \
"monitors") \
\
develop(bool, GenerateRangeChecks, true, \
"Generate range checks for array accesses") \
\
product_pd(bool, ImplicitNullChecks, DIAGNOSTIC, \
"Generate code for implicit null checks") \
\
product_pd(bool, TrapBasedNullChecks, \
"Generate code for null checks that uses a cmp and trap " \
"instruction raising SIGTRAP. This is only used if an access to" \
"null (+offset) will not raise a SIGSEGV, i.e.," \
"ImplicitNullChecks don't work (PPC64).") \
\
product(bool, EnableThreadSMRExtraValidityChecks, true, DIAGNOSTIC, \
"Enable Thread SMR extra validity checks") \
\
product(bool, EnableThreadSMRStatistics, trueInDebug, DIAGNOSTIC, \
"Enable Thread SMR Statistics") \
\
product(bool, UseNotificationThread, true, \
"Use Notification Thread") \
\
product(bool, Inline, true, \
"Enable inlining") \
\
product(bool, ClipInlining, true, \
"Clip inlining if aggregate method exceeds DesiredMethodLimit") \
\
develop(bool, UseCHA, true, \
"Enable CHA") \
\
product(bool, UseTypeProfile, true, \
"Check interpreter profile for historically monomorphic calls") \
\
product(bool, PrintInlining, false, DIAGNOSTIC, \
"Print inlining optimizations") \
\
product(bool, UsePopCountInstruction, false, \
"Use population count instruction") \
\
develop(bool, EagerInitialization, false, \
"Eagerly initialize classes if possible") \
\
product(bool, LogTouchedMethods, false, DIAGNOSTIC, \
"Log methods which have been ever touched in runtime") \
\
product(bool, PrintTouchedMethodsAtExit, false, DIAGNOSTIC, \
"Print all methods that have been ever touched in runtime") \
\
develop(bool, TraceMethodReplacement, false, \
"Print when methods are replaced do to recompilation") \
\
develop(bool, PrintMethodFlushing, false, \
"Print the nmethods being flushed") \
\
product(bool, PrintMethodFlushingStatistics, false, DIAGNOSTIC, \
"print statistics about method flushing") \
\
product(intx, HotMethodDetectionLimit, 100000, DIAGNOSTIC, \
"Number of compiled code invocations after which " \
"the method is considered as hot by the flusher") \
range(1, max_jint) \
\
product(intx, MinPassesBeforeFlush, 10, DIAGNOSTIC, \
"Minimum number of sweeper passes before an nmethod " \
"can be flushed") \
range(0, max_intx) \
\
product(bool, UseCodeAging, true, \
"Insert counter to detect warm methods") \
\
product(bool, StressCodeAging, false, DIAGNOSTIC, \
"Start with counters compiled in") \
\
develop(bool, StressCodeBuffers, false, \
"Exercise code buffer expansion and other rare state changes") \
\
product(bool, DebugNonSafepoints, trueInDebug, DIAGNOSTIC, \
"Generate extra debugging information for non-safepoints in " \
"nmethods") \
\
product(bool, PrintVMOptions, false, \
"Print flags that appeared on the command line") \
\
product(bool, IgnoreUnrecognizedVMOptions, false, \
"Ignore unrecognized VM options") \
\
product(bool, PrintCommandLineFlags, false, \
"Print flags specified on command line or set by ergonomics") \
\
product(bool, PrintFlagsInitial, false, \
"Print all VM flags before argument processing and exit VM") \
\
product(bool, PrintFlagsFinal, false, \
"Print all VM flags after argument and ergonomic processing") \
\
notproduct(bool, PrintFlagsWithComments, false, \
"Print all VM flags with default values and descriptions and " \
"exit") \
\
product(bool, PrintFlagsRanges, false, \
"Print VM flags and their ranges") \
\
product(bool, SerializeVMOutput, true, DIAGNOSTIC, \
"Use a mutex to serialize output to tty and LogFile") \
\
product(bool, DisplayVMOutput, true, DIAGNOSTIC, \
"Display all VM output on the tty, independently of LogVMOutput") \
\
product(bool, LogVMOutput, false, DIAGNOSTIC, \
"Save VM output to LogFile") \
\
product(ccstr, LogFile, NULL, DIAGNOSTIC, \
"If LogVMOutput or LogCompilation is on, save VM output to " \
"this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
\
product(ccstr, ErrorFile, NULL, \
"If an error occurs, save the error data to this file " \
"[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
\
product(bool, ExtensiveErrorReports, \
PRODUCT_ONLY(false) NOT_PRODUCT(true), \
"Error reports are more extensive.") \
\
product(bool, DisplayVMOutputToStderr, false, \
"If DisplayVMOutput is true, display all VM output to stderr") \
\
product(bool, DisplayVMOutputToStdout, false, \
"If DisplayVMOutput is true, display all VM output to stdout") \
\
product(bool, ErrorFileToStderr, false, \
"If true, error data is printed to stderr instead of a file") \
\
product(bool, ErrorFileToStdout, false, \
"If true, error data is printed to stdout instead of a file") \
\
product(bool, UseHeavyMonitors, false, \
"use heavyweight instead of lightweight Java monitors") \
\
product(bool, PrintStringTableStatistics, false, \
"print statistics about the StringTable and SymbolTable") \
\
product(bool, VerifyStringTableAtExit, false, DIAGNOSTIC, \
"verify StringTable contents at exit") \
\
notproduct(bool, PrintSymbolTableSizeHistogram, false, \
"print histogram of the symbol table") \
\
product(ccstr, AbortVMOnException, NULL, DIAGNOSTIC, \
"Call fatal if this exception is thrown. Example: " \
"java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
\
product(ccstr, AbortVMOnExceptionMessage, NULL, DIAGNOSTIC, \
"Call fatal if the exception pointed by AbortVMOnException " \
"has this message") \
\
develop(bool, DebugVtables, false, \
"add debugging code to vtable dispatch") \
\
notproduct(bool, PrintVtableStats, false, \
"print vtables stats at end of run") \
\
develop(bool, TraceCreateZombies, false, \
"trace creation of zombie nmethods") \
\
product(bool, RangeCheckElimination, true, \
"Eliminate range checks") \
\
develop_pd(bool, UncommonNullCast, \
"track occurrences of null in casts; adjust compiler tactics") \
\
develop(bool, TypeProfileCasts, true, \
"treat casts like calls for purposes of type profiling") \
\
develop(bool, TraceLivenessGen, false, \
"Trace the generation of liveness analysis information") \
\
notproduct(bool, TraceLivenessQuery, false, \
"Trace queries of liveness analysis information") \
\
notproduct(bool, CollectIndexSetStatistics, false, \
"Collect information about IndexSets") \
\
develop(bool, UseLoopSafepoints, true, \
"Generate Safepoint nodes in every loop") \
\
develop(intx, FastAllocateSizeLimit, 128*K, \
/* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
"Inline allocations larger than this in doublewords must go slow")\
\
product_pd(bool, CompactStrings, \
"Enable Strings to use single byte chars in backing store") \
\
product_pd(uintx, TypeProfileLevel, \
"=XYZ, with Z: Type profiling of arguments at call; " \
"Y: Type profiling of return value at call; " \
"X: Type profiling of parameters to methods; " \
"X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \
constraint(TypeProfileLevelConstraintFunc, AfterErgo) \
\
product(intx, TypeProfileArgsLimit, 2, \
"max number of call arguments to consider for type profiling") \
range(0, 16) \
\
product(intx, TypeProfileParmsLimit, 2, \
"max number of incoming parameters to consider for type profiling"\
", -1 for all") \
range(-1, 64) \
\
/* statistics */ \
develop(bool, CountCompiledCalls, false, \
"Count method invocations") \
\
notproduct(bool, ICMissHistogram, false, \
"Produce histogram of IC misses") \
\
/* interpreter */ \
product_pd(bool, RewriteBytecodes, \
"Allow rewriting of bytecodes (bytecodes are not immutable)") \
\
product_pd(bool, RewriteFrequentPairs, \
"Rewrite frequently used bytecode pairs into a single bytecode") \
\
product(bool, PrintInterpreter, false, DIAGNOSTIC, \
"Print the generated interpreter code") \
\
product(bool, UseInterpreter, true, \
"Use interpreter for non-compiled methods") \
\
develop(bool, UseFastSignatureHandlers, true, \
"Use fast signature handlers for native calls") \
\
product(bool, UseLoopCounter, true, \
"Increment invocation counter on backward branch") \
\
product_pd(bool, UseOnStackReplacement, \
"Use on stack replacement, calls runtime if invoc. counter " \
"overflows in loop") \
\
notproduct(bool, TraceOnStackReplacement, false, \
"Trace on stack replacement") \
\
product_pd(bool, PreferInterpreterNativeStubs, \
"Use always interpreter stubs for native methods invoked via " \
"interpreter") \
\
develop(bool, CountBytecodes, false, \
"Count number of bytecodes executed") \
\
develop(bool, PrintBytecodeHistogram, false, \
"Print histogram of the executed bytecodes") \
\
develop(bool, PrintBytecodePairHistogram, false, \
"Print histogram of the executed bytecode pairs") \
\
product(bool, PrintSignatureHandlers, false, DIAGNOSTIC, \
"Print code generated for native method signature handlers") \
\
develop(bool, VerifyOops, false, \
"Do plausibility checks for oops") \
\
develop(bool, CheckUnhandledOops, false, \
"Check for unhandled oops in VM code") \
\
develop(bool, VerifyJNIFields, trueInDebug, \
"Verify jfieldIDs for instance fields") \
\
notproduct(bool, VerifyJNIEnvThread, false, \
"Verify JNIEnv.thread == Thread::current() when entering VM " \
"from JNI") \
\
develop(bool, VerifyFPU, false, \
"Verify FPU state (check for NaN's, etc.)") \
\
develop(bool, VerifyThread, false, \
"Watch the thread register for corruption (SPARC only)") \
\
develop(bool, VerifyActivationFrameSize, false, \
"Verify that activation frame didn't become smaller than its " \
"minimal size") \
\
develop(bool, TraceFrequencyInlining, false, \
"Trace frequency based inlining") \
\
develop_pd(bool, InlineIntrinsics, \
"Inline intrinsics that can be statically resolved") \
\
product_pd(bool, ProfileInterpreter, \
"Profile at the bytecode level during interpretation") \
\
develop_pd(bool, ProfileTraps, \
"Profile deoptimization traps at the bytecode level") \
\
product(intx, ProfileMaturityPercentage, 20, \
"number of method invocations/branches (expressed as % of " \
"CompileThreshold) before using the method's profile") \
range(0, 100) \
\
product(bool, PrintMethodData, false, DIAGNOSTIC, \
"Print the results of +ProfileInterpreter at end of run") \
\
develop(bool, VerifyDataPointer, trueInDebug, \
"Verify the method data pointer during interpreter profiling") \
\
notproduct(bool, CrashGCForDumpingJavaThread, false, \
"Manually make GC thread crash then dump java stack trace; " \
"Test only") \
\
/* compilation */ \
product(bool, UseCompiler, true, \
"Use Just-In-Time compilation") \
\
product(bool, UseCounterDecay, true, \
"Adjust recompilation counters") \
\
develop(intx, CounterHalfLifeTime, 30, \
"Half-life time of invocation counters (in seconds)") \
\
develop(intx, CounterDecayMinIntervalLength, 500, \
"The minimum interval (in milliseconds) between invocation of " \
"CounterDecay") \
\
product(bool, AlwaysCompileLoopMethods, false, \
"When using recompilation, never interpret methods " \
"containing loops") \
\
product(intx, AllocatePrefetchStyle, 1, \
"0 = no prefetch, " \
"1 = generate prefetch instructions for each allocation, " \
"2 = use TLAB watermark to gate allocation prefetch, " \
"3 = generate one prefetch instruction per cache line") \
range(0, 3) \
\
product(intx, AllocatePrefetchDistance, -1, \
"Distance to prefetch ahead of allocation pointer. " \
"-1: use system-specific value (automatically determined") \
constraint(AllocatePrefetchDistanceConstraintFunc,AfterMemoryInit)\
\
product(intx, AllocatePrefetchLines, 3, \
"Number of lines to prefetch ahead of array allocation pointer") \
range(1, 64) \
\
product(intx, AllocateInstancePrefetchLines, 1, \
"Number of lines to prefetch ahead of instance allocation " \
"pointer") \
range(1, 64) \
\
product(intx, AllocatePrefetchStepSize, 16, \
"Step size in bytes of sequential prefetch instructions") \
range(1, 512) \
constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
\
product(intx, AllocatePrefetchInstr, 0, \
"Select instruction to prefetch ahead of allocation pointer") \
constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \
\
/* deoptimization */ \
develop(bool, TraceDeoptimization, false, \
"Trace deoptimization") \
\
develop(bool, PrintDeoptimizationDetails, false, \
"Print more information about deoptimization") \
\
develop(bool, DebugDeoptimization, false, \
"Tracing various information while debugging deoptimization") \
\
product(intx, SelfDestructTimer, 0, \
"Will cause VM to terminate after a given time (in minutes) " \
"(0 means off)") \
range(0, max_intx) \
\
product(intx, MaxJavaStackTraceDepth, 1024, \
"The maximum number of lines in the stack trace for Java " \
"exceptions (0 means all)") \
range(0, max_jint/2) \
\
/* notice: the max range value here is max_jint, not max_intx */ \
/* because of overflow issue */ \
product(intx, GuaranteedSafepointInterval, 1000, DIAGNOSTIC, \
"Guarantee a safepoint (at least) every so many milliseconds " \
"(0 means none)") \
range(0, max_jint) \
\
product(intx, SafepointTimeoutDelay, 10000, \
"Delay in milliseconds for option SafepointTimeout") \
range(0, max_intx LP64_ONLY(/MICROUNITS)) \
\
product(intx, NmethodSweepActivity, 10, \
"Removes cold nmethods from code cache if > 0. Higher values " \
"result in more aggressive sweeping") \
range(0, 2000) \
\
notproduct(bool, LogSweeper, false, \
"Keep a ring buffer of sweeper activity") \
\
notproduct(intx, SweeperLogEntries, 1024, \
"Number of records in the ring buffer of sweeper activity") \
\
develop(intx, MallocCatchPtr, -1, \
"Hit breakpoint when mallocing/freeing this pointer") \
\
notproduct(ccstrlist, SuppressErrorAt, "", \
"List of assertions (file:line) to muzzle") \
\
develop(intx, StackPrintLimit, 100, \
"number of stack frames to print in VM-level stack dump") \
\
notproduct(intx, MaxElementPrintSize, 256, \
"maximum number of elements to print") \
\
notproduct(intx, MaxSubklassPrintSize, 4, \
"maximum number of subklasses to print when printing klass") \
\
develop(intx, MaxForceInlineLevel, 100, \
"maximum number of nested calls that are forced for inlining " \
"(using CompileCommand or marked w/ @ForceInline)") \
range(0, max_jint) \
\
product(intx, MinInliningThreshold, 250, \
"The minimum invocation count a method needs to have to be " \
"inlined") \
range(0, max_jint) \
\
develop(intx, MethodHistogramCutoff, 100, \
"The cutoff value for method invocation histogram (+CountCalls)") \
\
develop(intx, DontYieldALotInterval, 10, \
"Interval between which yields will be dropped (milliseconds)") \
\
notproduct(intx, DeoptimizeALotInterval, 5, \
"Number of exits until DeoptimizeALot kicks in") \
\
notproduct(intx, ZombieALotInterval, 5, \
"Number of exits until ZombieALot kicks in") \
\
product(uintx, MallocMaxTestWords, 0, DIAGNOSTIC, \
"If non-zero, maximum number of words that malloc/realloc can " \
"allocate (for testing only)") \
range(0, max_uintx) \
\
product(intx, TypeProfileWidth, 2, \
"Number of receiver types to record in call/cast profile") \
range(0, 8) \
\
develop(intx, BciProfileWidth, 2, \
"Number of return bci's to record in ret profile") \
\
product(intx, PerMethodRecompilationCutoff, 400, \
"After recompiling N times, stay in the interpreter (-1=>'Inf')") \
range(-1, max_intx) \
\
product(intx, PerBytecodeRecompilationCutoff, 200, \
"Per-BCI limit on repeated recompilation (-1=>'Inf')") \
range(-1, max_intx) \
\
product(intx, PerMethodTrapLimit, 100, \
"Limit on traps (of one kind) in a method (includes inlines)") \
range(0, max_jint) \
\
product(intx, PerMethodSpecTrapLimit, 5000, EXPERIMENTAL, \
"Limit on speculative traps (of one kind) in a method " \
"(includes inlines)") \
range(0, max_jint) \
\
product(intx, PerBytecodeTrapLimit, 4, \
"Limit on traps (of one kind) at a particular BCI") \
range(0, max_jint) \
\
product(intx, SpecTrapLimitExtraEntries, 3, EXPERIMENTAL, \
"Extra method data trap entries for speculation") \
\
develop(intx, InlineFrequencyRatio, 20, \
"Ratio of call site execution to caller method invocation") \
range(0, max_jint) \
\
product_pd(intx, InlineFrequencyCount, DIAGNOSTIC, \
"Count of call site execution necessary to trigger frequent " \
"inlining") \
range(0, max_jint) \
\
develop(intx, InlineThrowCount, 50, \
"Force inlining of interpreted methods that throw this often") \
range(0, max_jint) \
\
develop(intx, InlineThrowMaxSize, 200, \
"Force inlining of throwing methods smaller than this") \
range(0, max_jint) \
\
product(size_t, MetaspaceSize, NOT_LP64(16 * M) LP64_ONLY(21 * M), \
"Initial threshold (in bytes) at which a garbage collection " \
"is done to reduce Metaspace usage") \
constraint(MetaspaceSizeConstraintFunc,AfterErgo) \
\
product(size_t, MaxMetaspaceSize, max_uintx, \
"Maximum size of Metaspaces (in bytes)") \
constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \
\
product(size_t, CompressedClassSpaceSize, 1*G, \
"Maximum size of class area in Metaspace when compressed " \
"class pointers are used") \
range(1*M, 3*G) \
\
product(ccstr, MetaspaceReclaimPolicy, "balanced", \
"options: balanced, aggressive, none") \
\
product(bool, PrintMetaspaceStatisticsAtExit, false, DIAGNOSTIC, \
"Print metaspace statistics upon VM exit.") \
\
product(bool, MetaspaceGuardAllocations, false, DIAGNOSTIC, \
"Metapace allocations are guarded.") \
\
product(bool, MetaspaceHandleDeallocations, true, DIAGNOSTIC, \
"Switch off Metapace deallocation handling.") \
\
product(uintx, MinHeapFreeRatio, 40, MANAGEABLE, \
"The minimum percentage of heap free after GC to avoid expansion."\
" For most GCs this applies to the old generation. In G1 and" \
" ParallelGC it applies to the whole heap.") \
range(0, 100) \
constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \
\
product(uintx, MaxHeapFreeRatio, 70, MANAGEABLE, \
"The maximum percentage of heap free after GC to avoid shrinking."\
" For most GCs this applies to the old generation. In G1 and" \
" ParallelGC it applies to the whole heap.") \
range(0, 100) \
constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \
\
product(bool, ShrinkHeapInSteps, true, \
"When disabled, informs the GC to shrink the java heap directly" \
" to the target size at the next full GC rather than requiring" \
" smaller steps during multiple full GCs.") \
\
product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
"Number of milliseconds per MB of free space in the heap") \
range(0, max_intx) \
constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
\
product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
"The minimum change in heap space due to GC (in bytes)") \
range(0, max_uintx) \
\
product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
"The minimum expansion of Metaspace (in bytes)") \
range(0, max_uintx) \
\
product(uintx, MaxMetaspaceFreeRatio, 70, \
"The maximum percentage of Metaspace free after GC to avoid " \
"shrinking") \
range(0, 100) \
constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \
\
product(uintx, MinMetaspaceFreeRatio, 40, \
"The minimum percentage of Metaspace free after GC to avoid " \
"expansion") \
range(0, 99) \
constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \
\
product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
"The maximum expansion of Metaspace without full GC (in bytes)") \
range(0, max_uintx) \
\
/* stack parameters */ \
product_pd(intx, StackYellowPages, \
"Number of yellow zone (recoverable overflows) pages of size " \
"4KB. If pages are bigger yellow zone is aligned up.") \
range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \
\
product_pd(intx, StackRedPages, \
"Number of red zone (unrecoverable overflows) pages of size " \
"4KB. If pages are bigger red zone is aligned up.") \
range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \
\
product_pd(intx, StackReservedPages, \
"Number of reserved zone (reserved to annotated methods) pages" \
" of size 4KB. If pages are bigger reserved zone is aligned up.") \
range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
\
product(bool, RestrictReservedStack, true, \
"Restrict @ReservedStackAccess to trusted classes") \
\
/* greater stack shadow pages can't generate instruction to bang stack */ \
product_pd(intx, StackShadowPages, \
"Number of shadow zone (for overflow checking) pages of size " \
"4KB. If pages are bigger shadow zone is aligned up. " \
"This should exceed the depth of the VM and native call stack.") \
range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \
\
product_pd(intx, ThreadStackSize, \
"Thread Stack Size (in Kbytes)") \
range(0, 1 * M) \
\
product_pd(intx, VMThreadStackSize, \
"Non-Java Thread Stack Size (in Kbytes)") \
range(0, max_intx/(1 * K)) \
\
product_pd(intx, CompilerThreadStackSize, \
"Compiler Thread Stack Size (in Kbytes)") \
range(0, max_intx/(1 * K)) \
\
develop_pd(size_t, JVMInvokeMethodSlack, \
"Stack space (bytes) required for JVM_InvokeMethod to complete") \
\
/* code cache parameters */ \
develop_pd(uintx, CodeCacheSegmentSize, \
"Code cache segment size (in bytes) - smallest unit of " \
"allocation") \
range(1, 1024) \
constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \
\
develop_pd(intx, CodeEntryAlignment, \
"Code entry alignment for generated code (in bytes)") \
constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \
\
product_pd(intx, OptoLoopAlignment, \
"Align inner loops to zero relative to this modulus") \
range(1, 16) \
constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \
\
product_pd(uintx, InitialCodeCacheSize, \
"Initial code cache size (in bytes)") \
constraint(VMPageSizeConstraintFunc, AtParse) \
\
develop_pd(uintx, CodeCacheMinimumUseSpace, \
"Minimum code cache size (in bytes) required to start VM.") \
range(0, max_uintx) \
\
product(bool, SegmentedCodeCache, false, \
"Use a segmented code cache") \
\
product_pd(uintx, ReservedCodeCacheSize, \
"Reserved code cache size (in bytes) - maximum code cache size") \
constraint(VMPageSizeConstraintFunc, AtParse) \
\
product_pd(uintx, NonProfiledCodeHeapSize, \
"Size of code heap with non-profiled methods (in bytes)") \
range(0, max_uintx) \
\
product_pd(uintx, ProfiledCodeHeapSize, \
"Size of code heap with profiled methods (in bytes)") \
range(0, max_uintx) \
\
product_pd(uintx, NonNMethodCodeHeapSize, \
"Size of code heap with non-nmethods (in bytes)") \
constraint(VMPageSizeConstraintFunc, AtParse) \
\
product_pd(uintx, CodeCacheExpansionSize, \
"Code cache expansion size (in bytes)") \
range(32*K, max_uintx) \
\
product_pd(uintx, CodeCacheMinBlockLength, DIAGNOSTIC, \
"Minimum number of segments in a code cache block") \
range(1, 100) \
\
notproduct(bool, ExitOnFullCodeCache, false, \
"Exit the VM if we fill the code cache") \
\
product(bool, UseCodeCacheFlushing, true, \
"Remove cold/old nmethods from the code cache") \
\
product(double, SweeperThreshold, 0.5, \
"Threshold controlling when code cache sweeper is invoked." \
"Value is percentage of ReservedCodeCacheSize.") \
range(0.0, 100.0) \
\
product(uintx, StartAggressiveSweepingAt, 10, \
"Start aggressive sweeping if X[%] of the code cache is free." \
"Segmented code cache: X[%] of the non-profiled heap." \
"Non-segmented code cache: X[%] of the total code cache") \
range(0, 100) \
\
/* AOT parameters */ \
product(bool, UseAOT, false, EXPERIMENTAL, \
"Use AOT compiled files") \
\
product(ccstrlist, AOTLibrary, NULL, EXPERIMENTAL, \
"AOT library") \
\
product(bool, PrintAOT, false, EXPERIMENTAL, \
"Print used AOT klasses and methods") \
\
notproduct(bool, PrintAOTStatistics, false, \
"Print AOT statistics") \
\
product(bool, UseAOTStrictLoading, false, DIAGNOSTIC, \
"Exit the VM if any of the AOT libraries has invalid config") \
\
product(bool, CalculateClassFingerprint, false, \
"Calculate class fingerprint") \
\
/* interpreter debugging */ \
develop(intx, BinarySwitchThreshold, 5, \
"Minimal number of lookupswitch entries for rewriting to binary " \
"switch") \
\
develop(intx, StopInterpreterAt, 0, \
"Stop interpreter execution at specified bytecode number") \
\
develop(intx, TraceBytecodesAt, 0, \
"Trace bytecodes starting with specified bytecode number") \
\
/* Priorities */ \
product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
\
product(intx, ThreadPriorityPolicy, 0, \
"0 : Normal. "\
" VM chooses priorities that are appropriate for normal "\
" applications. "\
" On Windows applications are allowed to use higher native "\
" priorities. However, with ThreadPriorityPolicy=0, VM will "\
" not use the highest possible native priority, "\
" THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\
" system threads. On Linux thread priorities are ignored "\
" because the OS does not support static priority in "\
" SCHED_OTHER scheduling class which is the only choice for "\
" non-root, non-realtime applications. "\
"1 : Aggressive. "\
" Java thread priorities map over to the entire range of "\
" native thread priorities. Higher Java thread priorities map "\
" to higher native thread priorities. This policy should be "\
" used with care, as sometimes it can cause performance "\
" degradation in the application and/or the entire system. On "\
" Linux/BSD/macOS this policy requires root privilege or an "\
" extended capability.") \
range(0, 1) \
\
product(bool, ThreadPriorityVerbose, false, \
"Print priority changes") \
\
product(intx, CompilerThreadPriority, -1, \
"The native priority at which compiler threads should run " \
"(-1 means no change)") \
range(min_jint, max_jint) \
\
product(intx, VMThreadPriority, -1, \
"The native priority at which the VM thread should run " \
"(-1 means no change)") \
range(-1, 127) \
\
product(intx, JavaPriority1_To_OSPriority, -1, \
"Map Java priorities to OS priorities") \
range(-1, 127) \
\
product(intx, JavaPriority2_To_OSPriority, -1, \
"Map Java priorities to OS priorities") \
range(-1, 127) \
\
product(intx, JavaPriority3_To_OSPriority, -1, \
"Map Java priorities to OS priorities") \
range(-1, 127) \
\
product(intx, JavaPriority4_To_OSPriority, -1, \
"Map Java priorities to OS priorities") \
range(-1, 127) \
\
product(intx, JavaPriority5_To_OSPriority, -1, \
"Map Java priorities to OS priorities") \
range(-1, 127) \
\
product(intx, JavaPriority6_To_OSPriority, -1, \
"Map Java priorities to OS priorities") \
range(-1, 127) \
\
product(intx, JavaPriority7_To_OSPriority, -1, \
"Map Java priorities to OS priorities") \
range(-1, 127) \
\
product(intx, JavaPriority8_To_OSPriority, -1, \
"Map Java priorities to OS priorities") \
range(-1, 127) \
\
product(intx, JavaPriority9_To_OSPriority, -1, \
"Map Java priorities to OS priorities") \
range(-1, 127) \
\
product(intx, JavaPriority10_To_OSPriority,-1, \
"Map Java priorities to OS priorities") \
range(-1, 127) \
\
product(bool, UseCriticalJavaThreadPriority, false, EXPERIMENTAL, \
"Java thread priority 10 maps to critical scheduling priority") \
\
product(bool, UseCriticalCompilerThreadPriority, false, EXPERIMENTAL, \
"Compiler thread(s) run at critical scheduling priority") \
\
develop(intx, NewCodeParameter, 0, \
"Testing Only: Create a dedicated integer parameter before " \
"putback") \
\
/* new oopmap storage allocation */ \
develop(intx, MinOopMapAllocation, 8, \
"Minimum number of OopMap entries in an OopMapSet") \
\
/* recompilation */ \
product_pd(intx, CompileThreshold, \
"number of interpreted method invocations before (re-)compiling") \
constraint(CompileThresholdConstraintFunc, AfterErgo) \
\
product_pd(bool, TieredCompilation, \
"Enable tiered compilation") \
\
/* Properties for Java libraries */ \
\
product(uint64_t, MaxDirectMemorySize, 0, \
"Maximum total size of NIO direct-buffer allocations") \
range(0, max_jlong) \
\
/* Flags used for temporary code during development */ \
\
product(bool, UseNewCode, false, DIAGNOSTIC, \
"Testing Only: Use the new version while testing") \
\
product(bool, UseNewCode2, false, DIAGNOSTIC, \
"Testing Only: Use the new version while testing") \
\
product(bool, UseNewCode3, false, DIAGNOSTIC, \
"Testing Only: Use the new version while testing") \
\
notproduct(bool, UseDebuggerErgo, false, \
"Debugging Only: Adjust the VM to be more debugger-friendly. " \
"Turns on the other UseDebuggerErgo* flags") \
\
notproduct(bool, UseDebuggerErgo1, false, \
"Debugging Only: Enable workarounds for debugger induced " \
"os::processor_id() >= os::processor_count() problems") \
\
notproduct(bool, UseDebuggerErgo2, false, \
"Debugging Only: Limit the number of spawned JVM threads") \
\
notproduct(bool, EnableJVMTIStackDepthAsserts, true, \
"Enable JVMTI asserts related to stack depth checks") \
\
/* flags for performance data collection */ \
\
product(bool, UsePerfData, true, \
"Flag to disable jvmstat instrumentation for performance testing "\
"and problem isolation purposes") \
\
product(bool, PerfDataSaveToFile, false, \
"Save PerfData memory to hsperfdata_<pid> file on exit") \
\
product(ccstr, PerfDataSaveFile, NULL, \
"Save PerfData memory to the specified absolute pathname. " \
"The string %p in the file name (if present) " \
"will be replaced by pid") \
\
product(intx, PerfDataSamplingInterval, 50, \
"Data sampling interval (in milliseconds)") \
range(PeriodicTask::min_interval, max_jint) \
constraint(PerfDataSamplingIntervalFunc, AfterErgo) \
\
product(bool, PerfDisableSharedMem, false, \
"Store performance data in standard memory") \
\
product(intx, PerfDataMemorySize, 32*K, \
"Size of performance data memory region. Will be rounded " \
"up to a multiple of the native os page size.") \
range(128, 32*64*K) \
\
product(intx, PerfMaxStringConstLength, 1024, \
"Maximum PerfStringConstant string length before truncation") \
range(32, 32*K) \
\
product(bool, PerfAllowAtExitRegistration, false, \
"Allow registration of atexit() methods") \
\
product(bool, PerfBypassFileSystemCheck, false, \
"Bypass Win32 file system criteria checks (Windows Only)") \
\
product(intx, UnguardOnExecutionViolation, 0, \
"Unguard page and retry on no-execute fault (Win32 only) " \
"0=off, 1=conservative, 2=aggressive") \
range(0, 2) \
\
/* Serviceability Support */ \
\
product(bool, ManagementServer, false, \
"Create JMX Management Server") \
\
product(bool, DisableAttachMechanism, false, \
"Disable mechanism that allows tools to attach to this VM") \
\
product(bool, StartAttachListener, false, \
"Always start Attach Listener at VM startup") \
\
product(bool, EnableDynamicAgentLoading, true, \
"Allow tools to load agents with the attach mechanism") \
\
product(bool, PrintConcurrentLocks, false, MANAGEABLE, \
"Print java.util.concurrent locks in thread dump") \
\
/* Shared spaces */ \
\
product(bool, UseSharedSpaces, true, \
"Use shared spaces for metadata") \
\
product(bool, VerifySharedSpaces, false, \
"Verify integrity of shared spaces") \
\
product(bool, RequireSharedSpaces, false, \
"Require shared spaces for metadata") \
\
product(bool, DumpSharedSpaces, false, \
"Special mode: JVM reads a class list, loads classes, builds " \
"shared spaces, and dumps the shared spaces to a file to be " \
"used in future JVM runs") \
\
product(bool, DynamicDumpSharedSpaces, false, \
"Dynamic archive") \
\
product(bool, RecordDynamicDumpInfo, false, \
"Record class info for jcmd VM.cds dynamic_dump") \
\
product(bool, PrintSharedArchiveAndExit, false, \
"Print shared archive file contents") \
\
product(bool, PrintSharedDictionary, false, \
"If PrintSharedArchiveAndExit is true, also print the shared " \
"dictionary") \
\
product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \
NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
"Address to allocate shared memory region for class data") \
range(0, SIZE_MAX) \
\
product(ccstr, SharedArchiveConfigFile, NULL, \
"Data to add to the CDS archive file") \
\
product(uintx, SharedSymbolTableBucketSize, 4, \
"Average number of symbols per bucket in shared table") \
range(2, 246) \
\
product(bool, AllowArchivingWithJavaAgent, false, DIAGNOSTIC, \
"Allow Java agent to be run with CDS dumping") \
\
product(bool, PrintMethodHandleStubs, false, DIAGNOSTIC, \
"Print generated stub code for method handles") \
\
product(bool, VerifyMethodHandles, trueInDebug, DIAGNOSTIC, \
"perform extra checks when constructing method handles") \
\
product(bool, ShowHiddenFrames, false, DIAGNOSTIC, \
"show method handle implementation frames (usually hidden)") \
\
product(bool, TrustFinalNonStaticFields, false, EXPERIMENTAL, \
"trust final non-static declarations for constant folding") \
\
product(bool, FoldStableValues, true, DIAGNOSTIC, \
"Optimize loads from stable fields (marked w/ @Stable)") \
\
product(int, UseBootstrapCallInfo, 1, DIAGNOSTIC, \
"0: when resolving InDy or ConDy, force all BSM arguments to be " \
"resolved before the bootstrap method is called; 1: when a BSM " \
"that may accept a BootstrapCallInfo is detected, use that API " \
"to pass BSM arguments, which allows the BSM to delay their " \
"resolution; 2+: stress test the BCI API by calling more BSMs " \
"via that API, instead of with the eagerly-resolved array.") \
\
product(bool, PauseAtStartup, false, DIAGNOSTIC, \
"Causes the VM to pause at startup time and wait for the pause " \
"file to be removed (default: ./vm.paused.<pid>)") \
\
product(ccstr, PauseAtStartupFile, NULL, DIAGNOSTIC, \
"The file to create and for whose removal to await when pausing " \
"at startup. (default: ./vm.paused.<pid>)") \
\
product(bool, PauseAtExit, false, DIAGNOSTIC, \
"Pause and wait for keypress on exit if a debugger is attached") \
\
product(bool, ExtendedDTraceProbes, false, \
"Enable performance-impacting dtrace probes") \
\
product(bool, DTraceMethodProbes, false, \
"Enable dtrace probes for method-entry and method-exit") \
\
product(bool, DTraceAllocProbes, false, \
"Enable dtrace probes for object allocation") \
\
product(bool, DTraceMonitorProbes, false, \
"Enable dtrace probes for monitor events") \
\
product(bool, RelaxAccessControlCheck, false, \
"Relax the access control checks in the verifier") \
\
product(uintx, StringTableSize, defaultStringTableSize, \
"Number of buckets in the interned String table " \
"(will be rounded to nearest higher power of 2)") \
range(minimumStringTableSize, 16777216ul /* 2^24 */) \
\
product(uintx, SymbolTableSize, defaultSymbolTableSize, EXPERIMENTAL, \
"Number of buckets in the JVM internal Symbol table") \
range(minimumSymbolTableSize, 16777216ul /* 2^24 */) \
\
product(bool, UseStringDeduplication, false, \
"Use string deduplication") \
\
product(uintx, StringDeduplicationAgeThreshold, 3, \
"A string must reach this age (or be promoted to an old region) " \
"to be considered for deduplication") \
range(1, markWord::max_age) \
\
product(bool, StringDeduplicationResizeALot, false, DIAGNOSTIC, \
"Force table resize every time the table is scanned") \
\
product(bool, StringDeduplicationRehashALot, false, DIAGNOSTIC, \
"Force table rehash every time the table is scanned") \
\
product(bool, WhiteBoxAPI, false, DIAGNOSTIC, \
"Enable internal testing APIs") \
\
product(ccstr, DumpLoadedClassList, NULL, \
"Dump the names all loaded classes, that could be stored into " \
"the CDS archive, in the specified file") \
\
product(ccstr, SharedClassListFile, NULL, \
"Override the default CDS class list") \
\
product(ccstr, SharedArchiveFile, NULL, \
"Override the default location of the CDS archive file") \
\
product(ccstr, ArchiveClassesAtExit, NULL, \
"The path and name of the dynamic archive file") \
\
product(ccstr, ExtraSharedClassListFile, NULL, \
"Extra classlist for building the CDS archive file") \
\
product(intx, ArchiveRelocationMode, 0, DIAGNOSTIC, \
"(0) first map at preferred address, and if " \
"unsuccessful, map at alternative address (default); " \
"(1) always map at alternative address; " \
"(2) always map at preferred address, and if unsuccessful, " \
"do not map the archive") \
range(0, 2) \
\
product(size_t, ArrayAllocatorMallocLimit, (size_t)-1, EXPERIMENTAL, \
"Allocation less than this value will be allocated " \
"using malloc. Larger allocations will use mmap.") \
\
product(bool, AlwaysAtomicAccesses, false, EXPERIMENTAL, \
"Accesses to all variables should always be atomic") \
\
product(bool, UseUnalignedAccesses, false, DIAGNOSTIC, \
"Use unaligned memory accesses in Unsafe") \
\
product_pd(bool, PreserveFramePointer, \
"Use the FP register for holding the frame pointer " \
"and not as a general purpose register.") \
\
product(bool, CheckIntrinsics, true, DIAGNOSTIC, \
"When a class C is loaded, check that " \
"(1) all intrinsics defined by the VM for class C are present "\
"in the loaded class file and are marked with the " \
"@IntrinsicCandidate annotation, that " \
"(2) there is an intrinsic registered for all loaded methods " \
"that are annotated with the @IntrinsicCandidate annotation, " \
"and that " \
"(3) no orphan methods exist for class C (i.e., methods for " \
"which the VM declares an intrinsic but that are not declared "\
"in the loaded class C. " \
"Check (3) is available only in debug builds.") \
\
product_pd(intx, InitArrayShortSize, DIAGNOSTIC, \
"Threshold small size (in bytes) for clearing arrays. " \
"Anything this size or smaller may get converted to discrete " \
"scalar stores.") \
range(0, max_intx) \
constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \
\
product(ccstr, AllocateHeapAt, NULL, \
"Path to the directory where a temporary file will be created " \
"to use as the backing store for Java Heap.") \
\
develop(int, VerifyMetaspaceInterval, DEBUG_ONLY(500) NOT_DEBUG(0), \
"Run periodic metaspace verifications (0 - none, " \
"1 - always, >1 every nth interval)") \
\
product(bool, ShowRegistersOnAssert, true, DIAGNOSTIC, \
"On internal errors, include registers in error report.") \
\
product(bool, UseSwitchProfiling, true, DIAGNOSTIC, \
"leverage profiling for table/lookup switch") \
\
develop(bool, TraceMemoryWriteback, false, \
"Trace memory writeback operations") \
\
JFR_ONLY(product(bool, FlightRecorder, false, \
"(Deprecated) Enable Flight Recorder")) \
\
JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL, \
"Flight Recorder options")) \
\
JFR_ONLY(product(ccstr, StartFlightRecording, NULL, \
"Start flight recording with options")) \
\
product(bool, UseFastUnorderedTimeStamps, false, EXPERIMENTAL, \
"Use platform unstable time where supported for timestamps only") \
\
product(bool, UseEmptySlotsInSupers, true, \
"Allow allocating fields in empty slots of super-classes") \
\
product(bool, DeoptimizeNMethodBarriersALot, false, DIAGNOSTIC, \
"Make nmethod barriers deoptimise a lot.") \
\
develop(bool, VerifyCrossModifyFence, \
false AARCH64_ONLY(DEBUG_ONLY(||true)), \
"Mark all threads after a safepoint, and clear on a modify " \
"fence. Add cleanliness checks.") \
// end of RUNTIME_FLAGS
DECLARE_FLAGS(LP64_RUNTIME_FLAGS)
DECLARE_ARCH_FLAGS(ARCH_FLAGS)
DECLARE_FLAGS(RUNTIME_FLAGS)
DECLARE_FLAGS(RUNTIME_OS_FLAGS)
#endif // SHARE_RUNTIME_GLOBALS_HPP
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