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graalvm native image expert options
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| ```bash | |
| GraalVM 22.2.0 Java 17 CE (Java Version 17.0.4+8-jvmci-22.2-b06) | |
| mintozzy@laptop:~$ native-image --expert-options-all | |
| -H:±AOTInline Deprecated. Default: + (enabled). | |
| -H:±AOTTrivialInline Perform trivial method inlining in the AOT compiled native image. Default: + (enabled). | |
| -H:APIFunctionPrefix="graal_" Prefix that is added to the names of API functions. | |
| -H:ASMInstructionProfiling=... Enables instruction profiling on assembler level. Valid values are a comma separated list of supported instructions. | |
| Compare with subclasses of Assembler.InstructionCounter. Default: None | |
| -H:±AbortOnBenchmarkCounterOverflow Abort VM with SIGILL if benchmark counters controlled by the (Generic|Timed|Benchmark)DynamicCounters. Default: - | |
| (disabled). [Extra help available] | |
| -H:±AddAllCharsets Make all hosted charsets available at run time. Default: - (disabled). | |
| -H:±AddAllFileSystemProviders Make all supported providers returned by FileSystemProvider.installedProviders() available at run time. Default: + | |
| (enabled). | |
| -H:AddExports=<string>* Value <module>/<package>=<target-module>(,<target-module>)* updates <module> to export <package> to <target-module>, | |
| regardless of module declaration. <target-module> can be ALL-UNNAMED to export to all unnamed modules. | |
| -H:AddOpens=<string>* Value <module>/<package>=<target-module>(,<target-module>)* updates <module> to open <package> to <target-module>, | |
| regardless of module declaration. | |
| -H:AddReads=<string>* Value <module>=<target-module>(,<target-module>)* updates <module> to read <target-module>, regardless of module | |
| declaration. <target-module> can be ALL-UNNAMED to read all unnamed modules. | |
| -H:AdditionalSecurityProviders=<string>* Comma-separated list of additional security provider fully qualified class names to mark as used.Note that this option | |
| is only necessary if you use custom engine classes not available in JCA that are not JCA compliant. | |
| -H:AdditionalSecurityServiceTypes=<string>* Comma-separated list of additional security service types (fully qualified class names) for automatic registration. Note | |
| that these must be JCA compliant. | |
| -H:AggregatedMetricsFile=... File to which aggregated metrics are dumped at shutdown. A CSV format is used if the file ends with .csv otherwise a | |
| more human readable format is used. If not specified, metrics are dumped to the console. Default: None | |
| -H:±AliasArrayTypeFlows Model all array type flows using a unique elements type flow abstraction. Default: + (enabled). | |
| -H:AlignedHeapChunkSize=1048576 The size of an aligned chunk. | |
| -H:AllocateInstancePrefetchLines=1 Number of cache lines to load after the object address using prefetch instructions. | |
| -H:AllocatePrefetchDistance=192 Sets the size (in bytes) of the prefetch distance for object allocation. Memory about to be written with the value of | |
| new objects is prefetched up to this distance starting from the address of the last allocated object. Each Java thread | |
| has its own allocation point. | |
| -H:AllocatePrefetchInstr=0 Sets the prefetch instruction to prefetch ahead of the allocation pointer. Possible values are from 0 to 3. The actual | |
| instructions behind the values depend on the platform. | |
| -H:AllocatePrefetchLines=4 Number of cache lines to load after the array allocation using prefetch instructions. | |
| -H:AllocatePrefetchStepSize=64 Sets the step size (in bytes) for sequential prefetch instructions. | |
| -H:AllocatePrefetchStyle=1 Generated code style for prefetch instructions: for 0 or less no prefetch instructions are generated and for 1 or more | |
| prefetch instructions are introduced after each allocation. | |
| -H:AllocationBeforePhysicalMemorySize=1048576 | |
| Bytes that can be allocated before (re-)querying the physical memory size. | |
| -H:±AllocationProfiling Enable runtime profiling of allocation. Default: - (disabled). | |
| -H:±AllocationSiteSensitiveHeap A context sensitive heap means that each heap allocated object is modeled by using at least the allocation site. | |
| Default: - (disabled). | |
| -H:±AllowFoldMethods Allow MethodTypeFlow to see @Fold methods. Default: - (disabled). | |
| -H:±AllowIncompleteClasspath Deprecated. Default: - (disabled). | |
| -H:±AllowJRTFileSystem Enable support for reading Java modules (jimage format) and the jrt:// file system. Requires java.home to be set at | |
| runtime. Default: - (disabled). | |
| -H:±AllowVMInspection Enables features that allow the VM to be inspected during runtime. Default: - (disabled). | |
| -H:±AllowVMInternalThreads Determines if VM internal threads (e.g., a dedicated VM operation or reference handling thread) are allowed in this | |
| image. Default: + (enabled). | |
| -H:±AlwaysInlineIntrinsics Unconditionally inline intrinsics. Default: - (disabled). | |
| -H:±AlwaysInlineVTableStubs Default: - (disabled). | |
| -H:AnalysisContextSensitivity="insens" Controls the static analysis context sensitivity. Available values: insens (context insensitive analysis), allocsens | |
| (context insensitive analysis, context insensitive heap, allocation site sensitive heap), _1obj (1 object sensitive | |
| analysis with a context insensitive heap), _2obj1h (2 object sensitive with a 1 context sensitive heap). | |
| -H:AnalysisSizeCutoff=8 The maximum size of type and method profiles returned by the static analysis. -1 indicates no limitation. | |
| -H:AnalysisStatisticsFile=... Analysis results statistics file. Default: None | |
| -H:ArrayRegionEqualsConstantLimit=4096 Array region equality checks will be evaluated at compile time if the receiver is a constant and its length is smaller | |
| than this value. | |
| -H:±AssertInitializationSpecifiedForAllClasses | |
| Assert class initialization is specified for all classes. Default: - (disabled). | |
| -H:±BenchmarkCounterPrintingCutoff Use a cutoff to print only most significant counters. Default: + (enabled). | |
| -H:±BenchmarkCountersDumpDynamic Dump dynamic counters. Default: + (enabled). | |
| -H:±BenchmarkCountersDumpStatic Dump static counters. Default: - (disabled). | |
| -H:BenchmarkCountersFile=... File to which benchmark counters are dumped. A CSV format is used if the file ends with .csv otherwise a more human | |
| readable format is used. The fields in the CSV format are: category, group, name, value. Default: None | |
| -H:BenchmarkDynamicCounters=... Turn on the benchmark counters. The format of this option is:. Default: None [Extra help available] | |
| -H:±BootstrapInitializeOnly Do not compile anything on bootstrap but just initialize the compiler. Default: - (disabled). | |
| -H:BootstrapTimeout=15.0 Maximum time in minutes to spend bootstrapping (0 to disable this limit). | |
| -H:BootstrapWatchDogCriticalRateRatio=0.25 Ratio of the maximum compilation rate below which the bootstrap compilation rate must not fall (0 or less disables | |
| monitoring). | |
| -H:±BuildOutputBreakdowns Show code and heap breakdowns as part of the build output. Default: + (enabled). | |
| -H:±BuildOutputColorful Colorize build output. Default: + (enabled). | |
| -H:±BuildOutputGCWarnings Print GC warnings as part of build output. Default: + (enabled). | |
| -H:±BuildOutputLinks Show links in build output. Default: + (enabled). | |
| -H:±BuildOutputPrefix Prefix build output with '<pid>:<image name>'. Default: - (disabled). | |
| -H:±BuildOutputProgress Report progress in build output. Default: + (enabled). | |
| -H:±BuildOutputUseNewStyle Use new build output style. Default: + (enabled). | |
| -H:CAPCacheDir="" Directory where information generated by the CAnnotation Processor are cached. | |
| -H:CCompilerOption=<string>* Provide custom C compiler option used for query code compilation. | |
| -H:CCompilerPath=... Provide custom path to C compiler used for query code compilation and linking. Default: None | |
| -H:CLibraryPath=<string>* Search path for C libraries passed to the linker (list of comma-separated directories). | |
| -H:CPUFeatures=<string>* Comma separated list of CPU features that will be enabled while building the target executable, irrespective of whether | |
| they are supported by the hosted environment. Note that enabling features not present within the target environment may | |
| result in application crashes. The specific options available are target platform dependent. See --list-cpu-features | |
| for feature list. | |
| -H:CStandard="C89" C standard to use in header files. Possible values are: [C89, C99, C11]. | |
| -H:±CanOmitFrame Default: + (enabled). | |
| -H:±CanonicalGraphStringsCheckConstants Exclude virtual nodes when dumping canonical text for graphs. Default: - (disabled). | |
| -H:±CanonicalGraphStringsExcludeVirtuals Exclude virtual nodes when dumping canonical text for graphs. Default: + (enabled). | |
| -H:±CanonicalGraphStringsRemoveIdentities Attempts to remove object identity hashes when dumping canonical text for graphs. Default: + (enabled). | |
| -H:±CheckRecurringCallbackOnNativeToJavaTransition | |
| Test whether a thread's recurring callback is pending on each transition from native code to Java. Default: - | |
| (disabled). | |
| -H:±CheckToolchain Check if native-toolchain is known to work with native-image. Default: + (enabled). | |
| -H:Class="" Class containing the default entry point method. Optional if --shared is used. | |
| -H:ClassInitialization=<string>* A comma-separated list of classes appended with their initialization strategy (':build_time', ':rerun', or ':run_time'). | |
| -H:±ClearMetricsAfterBootstrap Clear the debug metrics after bootstrap. Default: - (disabled). | |
| -H:CodeAlignment=16 Alignment of AOT and JIT compiled code in bytes. | |
| -H:±CodeCacheCounters Count accesses to the image and runtime code info table. Default: - (disabled). | |
| -H:±CodeInfoEncoderCounters Statistics about code and deoptimization information. Default: - (disabled). | |
| -H:CodeInfoIndexGranularity=256 The granularity of the index for looking up code metadata. Should be a power of 2. Larger values make the index smaller, | |
| but access slower. | |
| -H:±CollectImageBuildStatistics Collect information during image build about devirtualized invokes and bytecode exceptions. Default: - (disabled). | |
| -H:±CompilationBailoutAsFailure Treat compilation bailouts like compilation failures. Default: - (disabled). | |
| -H:CompilationCountLimit=0 The number of compilations allowed for any method before the VM exits (a value of 0 means there is no limit). | |
| -H:CompilationExcludePhases=... Exclude certain phases from compilation, either unconditionally or with a method filter. Multiple exclusions can be | |
| specified separated by ':'. Phase names are matched as substrings, e.g.: | |
| CompilationExcludePhases=PartialEscape:Loop=A.*,B.foo excludes PartialEscapePhase from all compilations and any phase | |
| containing 'Loop' in its name from compilations of all methods in class A and of method B.foo. Default: None | |
| -H:CompilationExpirationPeriod=300 Time limit in seconds before a compilation expires (0 to disable the limit). A non-zero value for this option is doubled | |
| if assertions are enabled and quadrupled if DetailedAsserts is true. | |
| -H:CompilationFailureAction=Silent Specifies the action to take when compilation fails. [Extra help available] | |
| -H:CompilationWatchDogStackTraceInterval=60.0 | |
| Interval in seconds between a watch dog reporting stack traces for long running compilations. | |
| -H:CompilationWatchDogStartDelay=0.0 Delay in seconds before watch dog monitoring a compilation (0 disables monitoring). | |
| -H:±CompileGraalWithC1Only In tiered mode compile Graal and JVMCI using optimized first tier code. Default: + (enabled). | |
| -H:CompilerBackend="lir" Backend used by the compiler. | |
| -H:CompilerConfiguration=... Names the compiler configuration to use. If omitted, the compiler configuration with the highest auto-selection priority | |
| is used. To see the set of available configurations, supply the value 'help' to this option. Default: None | |
| -H:±ConditionalElimination Default: + (enabled). | |
| -H:ConditionalEliminationMaxIterations=4 | |
| -H:ConfigurationFileDirectories=<string>* Directories directly containing configuration files for dynamic features at runtime. | |
| -H:ConfigurationResourceRoots=<string>* Resource path above configuration resources for dynamic features at runtime. | |
| -H:±ConfigureReflectionMetadata Enable runtime instantiation of reflection objects for non-invoked methods. Default: + (enabled). | |
| -H:Count=... Pattern for specifying scopes in which counters are enabled. See the Dump option for the pattern syntax. An empty value | |
| enables all counters unconditionally. Default: None | |
| -H:±CountWriteBarriers Instrument write barriers with counters. Default: - (disabled). | |
| -H:Counters=... Comma separated names of counters that are enabled irrespective of the value for Count option. An empty value enables | |
| all counters unconditionally. Default: None | |
| -H:CrashAt=... Pattern for method(s) that will trigger an exception when compiled. This option exists to test handling compilation | |
| crashes gracefully. See the MethodFilter option for the pattern syntax. A ':Bailout' suffix will raise a bailout | |
| exception and a ':PermanentBailout' suffix will raise a permanent bailout exception. Default: None | |
| -H:±DashboardAll In the dashboard dump, include all available information about the native image (this takes precedence over more | |
| specific flags). Default: - (disabled). | |
| -H:±DashboardBgv Set dashboard to use BGV format for dump. Default: + (enabled). | |
| -H:±DashboardCode In the dashboard dump, include the breakdown of the code size across different packages. Default: - (disabled). | |
| -H:DashboardDump=... Enable dashboard dumps to the specified file. Default: None | |
| -H:±DashboardHeap In the dashboard dump, include the breakdown of the object sizes in the heap across different classes. Default: - | |
| (disabled). | |
| -H:±DashboardJson Set dashboard to use JSON format for dump. Default: - (disabled). | |
| -H:±DashboardPointsTo In the dashboard dump, include the information about the points-to analysis. Default: - (disabled). | |
| -H:±DashboardPretty Set dashboard to use pretty print in JSON format. Default: - (disabled). | |
| -H:±DeadlockWatchdogExitOnTimeout Exit the image builder VM after printing call stacks. Default: + (enabled). | |
| -H:DeadlockWatchdogInterval=10 The interval in minutes between watchdog checks (0 disables the watchdog). | |
| -H:DebugInfoSourceCacheRoot="sources" Directory under which to create source file cache for Application or GraalVM classes. | |
| -H:DebugInfoSourceSearchPath=<string>* Search path for source files for Application or GraalVM classes (list of comma-separated directories or jar files). | |
| -H:±DebugStubsAndSnippets Enable debug output for stub code generation and snippet preparation. Default: - (disabled). | |
| -H:DefaultCharset="UTF-8" Default charset of the image, by the default it is the same as the default charset of the image builder. | |
| -H:DefaultLocale="en-GB" Default locale of the image, by the default it is the same as the default locale of the image builder. | |
| -H:±DeleteLocalSymbols Use linker option to remove all local symbols from image. Default: + (enabled). | |
| -H:±DeoptALot Default: - (disabled). | |
| -H:±DeoptAfterOSR Deoptimize OSR compiled code when the OSR entry loop is finished if there is no mature profile available for the rest of | |
| the method. Default: + (enabled). | |
| -H:±DeoptimizeAll Compiles all methods as deoptimization targets for testing. Default: - (disabled). | |
| -H:DeoptsToDisableOptimisticOptimization=40 | |
| -H:±DetailedAsserts Enable expensive assertions if normal assertions (i.e. -ea or -esa) are enabled. Default: - (disabled). | |
| -H:±DetectUserDirectoriesInImageHeap When set to true, the image generator verifies that the image heap does not contain a home directory as a substring. | |
| Default: - (disabled). | |
| -H:DiagnoseDumpLevel=3 Specify the dump level if CompilationFailureAction#Diagnose is used.See CompilationFailureAction for details. | |
| file:doc-files/CompilationFailureActionHelp.txt. | |
| -H:DiagnosticsDir="reports/diagnostics_20221114_220552" | |
| Sets the dir where diagnostic information is dumped. | |
| -H:±DiagnosticsMode Enables the diagnostic mode. Default: - (disabled). | |
| -H:±DisableIntercept Disable intercepting exceptions in debug scopes. Default: - (disabled). | |
| -H:DisableIntrinsics=... Disable intrinsics matching the given method filter (see MethodFilter option for details). For example, | |
| 'DisableIntrinsics=String.equals' disables intrinsics for any method named 'equals' in a class whose simple name is | |
| 'String'. You can append ':verbose' at the end of the filter value to print out disabled intrinsics as they are | |
| encountered during compilation (e.g., 'String.equals:verbose'). Default: None | |
| -H:±DisableTypeIdResultVerification For internal purposes only. Disables type id result verification even when running with assertions enabled. Default: + | |
| (enabled). | |
| -H:DisableURLProtocols=<string>* List of comma separated URL protocols that must never be included. | |
| -H:±DivertParameterReturningMethod Analysis: Detect methods that return one of their parameters and hardwire the parameter straight to the return. Default: | |
| + (enabled). | |
| -H:Dump=... Filter pattern for specifying scopes in which dumping is enabled. Default: None [Extra help available] | |
| -H:±DumpAfterEveryBCI Dump the current graph after every bci to IGV. Default: - (disabled). | |
| -H:±DumpEndVersusExitLoopFrequencies Debug flag to dump loop frequency differences computed based on loop end or exit nodes.If the frequencies diverge a lot, | |
| this may indicate missing profiles on control flowinside the loop body. Default: - (disabled). | |
| -H:DumpHeap=<string>* Dump the heap at a specific time during image building.The option accepts a list of comma separated phases, any of: | |
| during-analysis, after-analysis, before-compilation. | |
| -H:±DumpOnError Send compiler IR to dump handlers on error. Default: - (disabled). | |
| -H:DumpOnPhaseChange=... Dump a before and after graph if the named phase changes the graph.%nThe argument is substring matched against the | |
| simple name of the phase class. Default: None | |
| -H:DumpPath="graal_dumps" The directory where various Graal dump files are written. | |
| -H:±DumpTargetInfo Show native-toolchain information and image-build settings. Default: - (disabled). | |
| -H:±DumpThreadStacksOnSignal Dumps all thread stacktraces on SIGQUIT/SIGBREAK. Default: - (disabled). | |
| -H:±DumpingErrorsAreFatal Treat any exceptions during dumping as fatal. Default: - (disabled). | |
| -H:±DynamicCountersPrintGroupSeparator Use grouping separators for number printing. Default: + (enabled). | |
| -H:DynamicProxyConfigurationFiles=<string>* One or several (comma-separated) paths to JSON files that specify lists of interfaces that define Java proxy classes. | |
| [Extra help available] | |
| -H:DynamicProxyConfigurationResources=<string>* | |
| Resources describing program elements to be made available for reflection (see ProxyConfigurationFiles). | |
| -H:±DynamicProxyTracing Enable trace logging for dynamic proxy. Default: - (disabled). | |
| -H:±EagerSnippets Eagerly construct extra snippet info. Default: - (disabled). | |
| -H:±EarlyCodeEmissionOrder Enable early code emission order computation instead of late code emission order computation. Default: - (disabled). | |
| -H:±EarlyGVN Perform early global value numbering. Default: - (disabled). | |
| -H:±EarlyLICM Perform early loop invariant code motion. Default: - (disabled). | |
| -H:±EmitStringSubstitutions Emit substitutions for String methods. Default: + (enabled). | |
| -H:±EnableAllSecurityServices Add all security service classes to the generated image. Default: - (disabled). | |
| -H:±EnableLoggingFeature Enable the feature that provides support for logging. Default: + (enabled). | |
| -H:±EnableSecurityServicesFeature Enable automatic registration of security services. Default: + (enabled). | |
| -H:±EnableSignalAPI Enables the signal API (sun.misc.Signal or jdk.internal.misc.Signal). Defaults to false for shared library and true for | |
| executables. | |
| -H:EnableURLProtocols=<string>* List of comma separated URL protocols to enable. | |
| -H:±EnableWildcardExpansion Enable wildcard expansion in command line arguments on Windows. Default: + (enabled). | |
| -H:±EnforceMaxRuntimeCompileMethods Enforce checking of maximum number of methods allowed for runtime compilation. Useful for checking in the gate that the | |
| number of methods does not go up without a good reason. Default: - (disabled). | |
| -H:EntryPointNamePrefix="" Prefix that is added to the names of entry point methods. | |
| -H:EscapeAnalysisIterations=2 | |
| -H:EscapeAnalysisLoopCutoff=20 | |
| -H:EscapeAnalyzeOnly=... Default: None | |
| -H:ExactFullUnrollMaxNodes=800 | |
| -H:ExactPartialUnrollMaxNodes=200 | |
| -H:ExcludeResources=<string>* Regexp to match names of resources to be excluded from the image. | |
| -H:±ExhaustiveHeapScan Scan all objects reachable from roots for analysis. By default false. Default: - (disabled). | |
| -H:±ExitAfterAnalysis Exit after analysis. Default: - (disabled). | |
| -H:±ExitAfterCAPCache Exit image generation after C Annotation Processor Cache creation. Default: - (disabled). | |
| -H:±ExitAfterQueryCodeGeneration Output query code for target platform without executing it. Default: - (disabled). | |
| -H:±ExitAfterRelocatableImageWrite Exit after writing relocatable file. Default: - (disabled). | |
| -H:±ExitVMOnException Alias for CompilationFailureAction=ExitVM. Default: - (disabled). | |
| -H:±ExtendedAsserts Enable extended asserts which slow down analysis. Default: - (disabled). | |
| -H:±FailedLoopExplosionIsFatal Do not bail out but throw an exception on failed loop explosion. Default: - (disabled). | |
| -H:FallbackExecutorClasspath=... Internal option used to specify Classpath for FallbackExecutor. Default: None | |
| -H:FallbackExecutorJavaArg=<string>* Internal option used to specify java arguments for FallbackExecutor. | |
| -H:FallbackExecutorMainClass=... Internal option used to specify MainClass for FallbackExecutor. Default: None | |
| -H:FallbackExecutorSystemProperty=<string>* Internal option used to specify system properties for FallbackExecutor. | |
| -H:FallbackThreshold=5 Define when fallback-image generation should be used. | |
| -H:Features=<string>* A comma-separated list of fully qualified Feature implementation classes. | |
| -H:±FloatingDivNodes Try to float non-constant division operations to expose global value numbering of divisions. Default: + (enabled). | |
| -H:±FoldSecurityManagerGetter Fold SecurityManager getter. Default: + (enabled). | |
| -H:±ForceAdversarialLayout Place N-byte constants in the data section such that they are misaligned with respect to N*2. For example, place 4 byte | |
| constants at offset 4, 12 or 20, etc. This layout is used to detect instructions that load constants with alignment | |
| smaller than the fetch size. For instance, an XORPS instruction that does a 16-byte fetch of a 4-byte float not aligned | |
| to 16 bytes will cause a segfault. Default: - (disabled). | |
| -H:±ForceNoROSectionRelocations Use only a writable native image heap (requires ld.gold linker). Default: - (disabled). | |
| -H:±FullUnroll Default: + (enabled). | |
| -H:FullUnrollConstantCompareBoost=15 | |
| -H:FullUnrollMaxApplication=60 | |
| -H:FullUnrollMaxIterations=600 | |
| -H:FullUnrollMaxNodes=400 | |
| -H:GCDebugStartCycle=-1 Start tracing compiled GC barriers after N garbage collections (disabled if N <= 0). | |
| -H:±GatherSafepointStatistics Gather statistics about each safepoint. Default: - (disabled). | |
| -H:±GenLoopSafepoints Default: + (enabled). | |
| -H:GenerateDebugInfo=0 Insert debug info into the generated native image or library. | |
| -H:±GenericDynamicCounters Turn on the benchmark counters, and displays the results on VM shutdown. Default: - (disabled). | |
| -H:±GraalArithmeticStubs Use Graal arithmetic stubs instead of HotSpot stubs where possible. Default: + (enabled). | |
| -H:GraalCompileOnly=... A filter applied to a method the VM has selected for compilation by Graal. A method not matching the filter is | |
| redirected to a lower tier compiler. The filter format is the same as for the MethodFilter option. Default: None | |
| -H:GraphCompressionThreshold=70 Graal graph compression is performed when percent of live nodes falls below this value. | |
| -H:±GreyToBlackObjRefDemographics Develop demographics of the object references visited. Default: - (disabled). | |
| -H:GreyToBlackObjectVisitorDiagnosticHistory=0 | |
| Length of GreyToBlackObjectVisitor history for diagnostics. 0 implies no history is kept. | |
| -H:±GuardPriorities Default: + (enabled). | |
| -H:HeapChunkHeaderPadding=0 Number of bytes at the beginning of each heap chunk that are not used for payload data, i.e., can be freely used as | |
| metadata by the heap chunk provider. | |
| -H:HeapVerifierVerbosity=0 Control heap verifier verbosity level: 0 - quiet, 1 - info, 2 - warning, 3 - all. | |
| -H:±HotSpotDeoptExplicitExceptions Testing only option that forces deopts for exception throws. Default: - (disabled). | |
| -H:±HotSpotPostOnExceptions Testing only option that forces deopts for exception throws. Default: - (disabled). | |
| -H:±HotSpotPrintInlining Print inlining optimizations. Default: - (disabled). | |
| -H:±HybridStaticContext Enable hybrid context for static methods, i.e. uses invocation site as context for static methods. Default: - | |
| (disabled). | |
| -H:ImageBuildStatisticsFile=... File for printing image build statistics. Default: None | |
| -H:±ImageHeapCardMarking Enables card marking for image heap objects, which arranges them in chunks. Automatically enabled when supported. | |
| -H:ImageObjectTreeExpandRoots="" Override the default suppression of specified roots. See: Reports.md. | |
| -H:ImageObjectTreeExpandTypes="" Override the default suppression of specified types. See: Reports.md. | |
| -H:ImageObjectTreeSuppressRoots="" Suppress the expansion of specified roots. See: Reports.md. | |
| -H:ImageObjectTreeSuppressTypes="" Suppress the expansion of specified types. See: Reports.md. | |
| -H:ImageSymbolsPrefix="" Common prefix used by method symbols in image. | |
| -H:±IncludeAllLocales Make all hosted locales available at run time. Default: - (disabled). | |
| -H:±IncludeAllTimeZones When true, all time zones will be pre-initialized in the image. Default: - (disabled). | |
| -H:±IncludeDebugHelperMethods Determines if debugging-specific helper methods are embedded into the image. Those methods can be called directly from | |
| the debugger to obtain or print additional information. Default: - (disabled). | |
| -H:IncludeLocales=<string>* Comma separated list of locales to be included into the image. The default locale is included in the list automatically | |
| if not present. | |
| -H:±IncludeMethodData Include a list of methods included in the image for runtime inspection. Default: + (enabled). | |
| -H:±IncludeNodeSourcePositions Track NodeSourcePositions during runtime-compilation. Default: - (disabled). | |
| -H:IncludeResourceBundles=<string>* Comma separated list of bundles to be included into the image. | |
| -H:IncludeResources=<string>* Regexp to match names of resources to be included in the image. | |
| -H:IncludeTimeZones="" The time zones, in addition to the default zone of the host, that will be pre-initialized in the image. | |
| -H:InitialCollectionPolicy="Adaptive" The garbage collection policy, either Adaptive (default) or BySpaceAndTime. | |
| -H:±Inline Enable inlining. Default: + (enabled). | |
| -H:±InlineBeforeAnalysis Inline methods before static analysis. Default: + (enabled). | |
| -H:InlineBeforeAnalysisAllowedDepth=20 Maximum number of invokes for method inlined before static analysis. | |
| -H:InlineBeforeAnalysisAllowedInvokes=1 Maximum number of invokes for method inlined before static analysis. | |
| -H:InlineBeforeAnalysisAllowedNodes=1 Maximum number of computation nodes for method inlined before static analysis. | |
| -H:±InlineDuringParsing Inlines trivial methods during bytecode parsing. Default: + (enabled). | |
| -H:InlineDuringParsingMaxDepth=10 Maximum depth when inlining during bytecode parsing. | |
| -H:±InlineEverything Default: - (disabled). | |
| -H:±InlineMegamorphicCalls Inline calls with megamorphic type profile (i.e., not all types could be recorded). Default: + (enabled). | |
| -H:±InlineMonomorphicCalls Inline calls with monomorphic type profile. Default: + (enabled). | |
| -H:±InlinePartialIntrinsicExitDuringParsing Inlines partial intrinsic exits during bytecode parsing when possible. A partial intrinsic exit is a call within an | |
| intrinsic to the method being intrinsified and denotes semantics of the original method that the intrinsic does not | |
| support. Default: + (enabled). | |
| -H:±InlinePolymorphicCalls Inline calls with polymorphic type profile. Default: + (enabled). | |
| -H:±InlineVTableStubs Default: + (enabled). | |
| -H:InliningDepthError=1000 Maximum inlining depth during partial evaluation before reporting an infinite recursion. | |
| -H:InspectServerContentPath="inspect" Path to the contents of the Inspect web server. | |
| -H:±InstallExitHandlers Provide java.lang.Terminator exit handlers. Default: - (disabled). | |
| -H:±InterceptBailout Intercept also bailout exceptions. Default: - (disabled). | |
| -H:±InternalSymbolsAreGlobal Compatibility option to make symbols used for the image heap global. Using global symbols is problematic for shared | |
| libraries because the loader implicitly changes the value when the symbol is already defined in the executable loading | |
| the library. Setting this option to true preserves the broken behavior of old Native Image versions. Default: - | |
| (disabled). | |
| -H:InternalThreadStackSize=2097152 The size of each internal thread stack, in bytes. | |
| -H:±Intrinsify Use compiler intrinsifications. Default: + (enabled). | |
| -H:IsolatedLoopHeaderAlignment=32 Alignment in bytes for loop header blocks that have no fall through paths. | |
| -H:IterativePeelingLimit=2 Allow iterative peeling of loops up to this many times (each time the peeling phase runs). | |
| -H:±JNI Enable Java Native Interface (JNI) support. Default: + (enabled). | |
| -H:JNIConfigurationFiles=<string>* Files describing program elements to be made accessible via JNI (for syntax, see ReflectionConfigurationFiles). | |
| -H:JNIConfigurationResources=<string>* Resources describing program elements to be made accessible via JNI (see JNIConfigurationFiles). | |
| -H:±JNIExportSymbols Export Invocation API symbols. Default: + (enabled). | |
| -H:±JNIVerboseLookupErrors Report information about known JNI elements when lookup fails. Default: - (disabled). | |
| -H:±LIRDynMoveProfileMethod Enable dynamic move profiling per method. Default: - (disabled). | |
| -H:±LIROptConstantLoadOptimization Enable constant load optimization. | |
| -H:±LIROptControlFlowOptimizer | |
| -H:±LIROptEdgeMoveOptimizer | |
| -H:±LIROptLSRAEliminateSpillMoves Enable spill move elimination. | |
| -H:±LIROptLSRAOptimizeSpillPosition Enable spill position optimization. | |
| -H:±LIROptLSStackSlotAllocator Use linear scan stack slot allocation. | |
| -H:±LIROptNullCheckOptimizer | |
| -H:±LIROptRedundantMoveElimination | |
| -H:±LIROptStackMoveOptimizer | |
| -H:±LIROptimization Enable LIR level optimizations. Default: + (enabled). | |
| -H:±LIRProfileMethods Enables profiling of methods. Default: - (disabled). | |
| -H:±LIRProfileMoves Enables profiling of move types on LIR level. Move types are for example stores (register to stack), constant loads | |
| (constant to register) or copies (register to register). Default: - (disabled). | |
| -H:±LSRAOptSplitOnly LSRA optimization: Only split but do not reassign. Default: - (disabled). | |
| -H:±LSRAOptimization Enable LSRA optimization. Default: - (disabled). | |
| -H:LargeArrayThreshold=0 The size at or above which an array will be allocated in its own unaligned chunk. 0 implies (AlignedHeapChunkSize / 8). | |
| -H:LimitInlinedInvokes=5.0 | |
| -H:±LimitObjectArrayLength Enable a limit for the number of objects recorded for each type of a type state before disabling heap sensitivity for | |
| that type. The analysis must be heap sensitive. Default: - (disabled). | |
| -H:LinkAtBuildTime=<string>* Require types to be fully defined at image build-time. If used without args, all classes in scope of the option are | |
| required to be fully defined. [Extra help available] | |
| -H:LinkAtBuildTimePaths=<string>* Require all types in given class or module-path entries to be fully defined at image build-time. [Extra help available] | |
| -H:LinkerRPath=<string>* Path passed to the linker as the -rpath (list of comma-separated directories). | |
| -H:±ListCPUFeatures Show CPU features specific to the target platform and exit. Default: - (disabled). | |
| -H:±ListMetrics Lists on the console at VM shutdown the metric names available to the Timers, Counters and MemUseTrackers options. Note | |
| that this only lists the metrics that were initialized during the VM execution and so will not include metrics for | |
| compiler code that is not executed. Default: - (disabled). | |
| -H:±LoadExceptionObjectInVM Use a VM runtime call to load and clear the exception object from the thread at the start of a compiled exception | |
| handler. Default: - (disabled). | |
| -H:LocalizationCompressBundles=<string>* Regular expressions matching which bundles should be compressed. | |
| -H:±LocalizationCompressInParallel Compress the bundles in parallel. Default: + (enabled). | |
| -H:±LocalizationOptimizedMode Optimize the resource bundle lookup using a simple map. Default: - (disabled). | |
| -H:±LocalizationSubstituteLoadLookup Store the resource bundle content more efficiently in the fallback mode. Default: + (enabled). | |
| -H:Log=... Pattern for specifying scopes in which logging is enabled. See the Dump option for the pattern syntax. Default: None | |
| -H:LogFile=... File to which logging is sent. A %p in the name will be replaced with a string identifying the process, usually the | |
| process id and %t will be replaced by System.currentTimeMillis(). If the current runtime is in an isolate, then %i will | |
| be replaced by '<isolate id>' otherwise %i is removed. An %I is the same as %i except that the replacement is '<isolate | |
| id>@<isolate address>'. Using %o as filename sends logging to System.out whereas %e sends logging to System.err. | |
| Default: None | |
| -H:±LogVerbose Enable more verbose log output when available. Default: - (disabled). | |
| -H:LoopExitVsLoopEndFrequencyDiff=1000.0 Scaling factor of frequency difference computed based on loop ends or exits. | |
| -H:LoopHeaderAlignment=16 Alignment in bytes for loop header blocks. | |
| -H:LoopMaxUnswitch=3 | |
| -H:±LoopPeeling Default: + (enabled). | |
| -H:±LoopPredication Hoists array bounds checks out of simple loops. This is ignored if SpeculativeGuardMovement is enabled. Default: + | |
| (enabled). | |
| -H:±LoopPredicationMainPath Restricts LoopPredication to only focus on array bounds checks that dominate the back edge of a loop. Default: + | |
| (enabled). | |
| -H:±LoopUnswitch Default: + (enabled). | |
| -H:LoopUnswitchFrequencyBoost=10.0 Number of nodes allowed for a loop unswitching per loop frequency. The number of nodes allowed for the unswitching is | |
| proportional to the relative frequency of the loop by this constant. | |
| -H:LoopUnswitchFrequencyMaxFactor=0.95 Maximun value for the frequency factor of an invariant. | |
| -H:LoopUnswitchFrequencyMinFactor=0.05 Minimum value for the frequency factor of an invariant. | |
| -H:LoopUnswitchMaxIncrease=2000 Maximum loop unswitching code size increase in nodes. | |
| -H:LoopUnswitchMinSplitFrequency=1.0 Lower bound for the minimun frequency of an invariant condition to be unswitched. | |
| -H:LoopUnswitchTrivial=10 Number of nodes allowed for a loop unswitching regardless of the loop frequency. | |
| -H:±MatchExpressions Allow backend to match complex expressions. Default: + (enabled). | |
| -H:MaxCallingContextDepth=0 The maximum length of the methods context chains. | |
| -H:MaxCallingContextWidth=0 The maximum number of contexts to record for a method. It only affects the analysis when the max and min calling context | |
| depth are different. | |
| -H:MaxCompilationProblemsPerAction=2 The maximum number of compilation failures to handle with the action specified by CompilationFailureAction before | |
| changing to a less verbose action. This does not apply to the ExitVM action. | |
| -H:MaxConstantObjectsPerType=100 The maximum number of constant objects recorded for each type before merging the constants into one unique constant | |
| object per type. The analysis must be heap sensitive. It has a minimum value of 1. | |
| -H:MaxDuplicationFactor=2.0 Max amount of extra effort to expend handling irreducible loops. A value <= 1 disables support for irreducible loops. | |
| -H:MaxHeapContextDepth=0 The maximum length of the context used to model a heap object in addition to the allocation site; used only when | |
| ContextSensitiveHeap is enabled. | |
| -H:MaxHeapContextWidth=0 The maximum number of contexts to record for a heap object. It only affects the analysis when the max and min calling | |
| context depth are different. | |
| -H:MaxInvokesInTrivialMethod=1 Maximum number of invokes in a method so that it is considered trivial (for testing only). | |
| -H:MaxNodesInTrivialLeafMethod=40 Maximum number of nodes in a method so that it is considered trivial, if it does not have any invokes. | |
| -H:MaxNodesInTrivialMethod=20 Maximum number of nodes in a method so that it is considered trivial. | |
| -H:MaxObjectSetSize=100 The maximum number of objects recorded for each type of a type state before disabling heap sensitivity for that type. | |
| The analysis must be heap sensitive. It has a minimum value of 1. | |
| -H:MaxReachableTypes=-1 Maximum number of types allowed in the image. Used for tests where small number of types is necessary. | |
| -H:MaxRuntimeCompileMethods=<string>* Maximum number of methods allowed for runtime compilation. | |
| -H:MaxSurvivorSpaces=... Maximum number of survivor spaces. Default: None | |
| -H:MaxTemplatesPerSnippet=50 | |
| -H:MaxUnrolledObjectZeroingStores=8 Define the maximum number of stores for which the loop that zeroes out objects is unrolled. | |
| -H:MaximumDesiredSize=20000 Maximum desired size of the compiler graph in nodes. | |
| -H:MaximumEscapeAnalysisArrayLength=128 The maximum length of an array that will be escape analyzed. | |
| -H:MaximumInliningSize=300 Inlining is explored up to this number of nodes in the graph for each call site. | |
| -H:MaximumLoopExplosionCount=10000 Max number of loop explosions per method. | |
| -H:MaximumRecursiveInlining=5 Maximum level of recursive inlining. | |
| -H:MegamorphicInliningMinMethodProbability=0.33 | |
| Minimum probability for methods to be inlined for megamorphic type profiles. | |
| -H:MemUseTrackers=... Comma separated names of memory usage trackers that are enabled irrespective of the value for TrackMemUse option. An | |
| empty value enables all memory usage trackers unconditionally. Default: None | |
| -H:Method="main" Name of the main entry point method. Optional if --shared is used. | |
| -H:MethodFilter=... Pattern for matching methods. The syntax for a pattern is:. Default: None [Extra help available] | |
| -H:±MethodFilterRootOnly Only check MethodFilter against the root method in the context if true, otherwise check all methods. Default: - | |
| (disabled). | |
| -H:MethodInlineBailoutLimit=5000 Per-compilation method inlining exploration limit before giving up (use 0 to disable). | |
| -H:MetricsFile=... File to which metrics are dumped per compilation. Default: None [Extra help available] | |
| -H:MinCallingContextDepth=0 The minimum length of the methods context chains. | |
| -H:MinHeapContextDepth=0 The minimum length of the context used to model a heap object in addition to the allocation site; used only when | |
| ContextSensitiveHeap is enabled. | |
| -H:MinimalBulkZeroingSize=2048 If applicable, use bulk zeroing instructions when the zeroing size in bytes exceeds this threshold. | |
| -H:MinimalGraphNodeSizeCheckSize=1000 Minimal size in NodeSize to check the graph size increases of phases. | |
| -H:MinimumPeelFrequency=0.35 | |
| -H:Module="" Module containing the class that contains the main entry point. Optional if --shared is used. | |
| -H:±MoveGuardsUpwards Move guard nodes to earlier places in the dominator tree if all successors of basic block share a common guard | |
| condition. Default: + (enabled). | |
| -H:±MultiThreaded Enable support for threads and and thread-local variables (disable for single-threaded implementation). Default: + | |
| (enabled). | |
| -H:NDCV=0 Run level for NoDeadCodeVerifyHandler (0 = off, 1 = info, 2 = verbose, 3 = fatal). | |
| -H:Name="" Name of the output file to be generated. | |
| -H:±NativeArchitecture Overrides CPUFeatures and uses the native architecture, i.e., the architecture of a machine that builds an image. | |
| NativeArchitecture takes precedence over CPUFeatures. Default: - (disabled). | |
| -H:NativeLinkerOption=<string>* Pass the provided raw option that will be appended to the linker command to produce the final binary. The possible | |
| options are platform specific and passed through without any validation. | |
| -H:NeverInline=<string>* Pattern for disabling inlining of methods during image generation. [Extra help available] | |
| -H:±NewCAPCache Create a C Annotation Processor Cache. Will erase any previous cache at that same location. Default: - (disabled). | |
| -H:±NodeCounters Counts the number of instances of each node class. Default: - (disabled). | |
| -H:NonFatalIdenticalCompilationSnapshots=20 Number of contiguous identical compiler thread stack traces allowed before the VM exits on the basis of a stuck | |
| compilation. | |
| -H:NumberOfAnalysisThreads=-1 The number of threads to use for analysis during native image generation. The number must be smaller than the | |
| NumberOfThreads. | |
| -H:NumberOfThreads=8 The maximum number of threads to use concurrently during native image generation. | |
| -H:ObjdumpExecutables=... Comma separated list of candidate GNU objdump executables. If not specified, disassembling via GNU objdump is disabled. | |
| Otherwise, the first existing executable in the list is used. Default: None | |
| -H:±OmitHotExceptionStacktrace Default: - (disabled). | |
| -H:±OmitInlinedMethodDebugLineInfo Omit generation of DebugLineInfo originating from inlined methods. Default: + (enabled). | |
| -H:±OptAssumptions Default: + (enabled). | |
| -H:±OptConvertDeoptsToGuards Default: + (enabled). | |
| -H:±OptDeoptimizationGrouping Default: + (enabled). | |
| -H:±OptDevirtualizeInvokesOptimistically Default: + (enabled). | |
| -H:±OptEarlyReadElimination Default: + (enabled). | |
| -H:±OptEliminateGuards Default: + (enabled). | |
| -H:±OptFloatingReads Default: + (enabled). | |
| -H:±OptImplicitNullChecks Default: + (enabled). | |
| -H:±OptReadElimination Default: + (enabled). | |
| -H:±OptScheduleOutOfLoops Default: + (enabled). | |
| -H:±OptStaticFinalFieldFolding Optimize static final fields that get a constant assigned in the class initializer. Default: + (enabled). | |
| -H:Optimize="2" Control native-image code optimizations: b - optimize for shortest build time, 0 - no optimizations, 1 - basic | |
| optimizations, 2 - aggressive optimizations. | |
| -H:PageSize=0 Define PageSize of a machine that runs the image. The default = 0 (== same as host machine page size). | |
| -H:±ParseOnce When true, compiler graphs are parsed only once before static analysis. When false, compiler graphs are parsed for | |
| static analysis and again for AOT compilation. Default: + (enabled). | |
| -H:±ParseRuntimeOptions Parse and consume standard options and system properties from the command line arguments when the VM is created. | |
| Default: + (enabled). | |
| -H:±PartialEscapeAnalysis Default: + (enabled). | |
| -H:±PartialUnroll Default: + (enabled). | |
| -H:Path=... Directory of the image file to be generated. Default: None | |
| -H:±PeelALot Default: - (disabled). | |
| -H:±PlatformInterfaceCompatibilityMode Enable the behavior of old GraalVM versions. When enabled, interfaces not available for the current platform are | |
| filtered. Default: - (disabled). | |
| -H:PredefinedClassesConfigurationFiles=<string>* | |
| Files describing predefined classes that can be loaded at runtime. | |
| -H:PredefinedClassesConfigurationResources=<string>* | |
| Resources describing predefined classes that can be loaded at runtime. | |
| -H:±PreserveFramePointer Saves stack base pointer on the stack on method entry. Default: - (disabled). | |
| -H:±PrintAOTCompilation Print logging information during compilation. Default: - (disabled). | |
| -H:±PrintAnalysisCallTree Print analysis call tree, a breadth-first tree reduction of the call graph. Default: - (disabled). | |
| -H:PrintAnalysisCallTreeType=TXT Change the output format of the analysis call tree, available options are TXT and CSV. See: Reports.md. | |
| -H:±PrintAnalysisStatistics Print analysis results statistics. Default: - (disabled). | |
| -H:±PrintBackendCFG Enable dumping scheduled HIR, LIR, register allocation and code generation info to the C1Visualizer. Default: - | |
| (disabled). | |
| -H:±PrintBlockMapping Enable dumping CFG built during initial BciBlockMapping. Default: - (disabled). | |
| -H:±PrintCallEdges Print call edges with other analysis results statistics. Default: - (disabled). | |
| -H:PrintCanonicalGraphStringFlavor=0 Choose format used when dumping canonical text for graphs: 0 gives a scheduled graph (better for spotting changes | |
| involving the schedule) while 1 gives a CFG containing expressions rooted at fixed nodes (better for spotting small | |
| structure differences). | |
| -H:±PrintCanonicalGraphStrings Enable dumping canonical text from for graphs. Default: - (disabled). | |
| -H:±PrintClassInitialization Prints class initialization info for all classes detected by analysis. Default: - (disabled). | |
| -H:±PrintCompilation Print an informational line to the console for each completed compilation. Default: - (disabled). | |
| -H:±PrintFeatures Print a list of active features. Default: - (disabled). | |
| -H:PrintFlags=... Show available options based on comma-separated option-types (allowed categories: User, Expert, Debug). Default: None | |
| -H:PrintFlagsWithExtraHelp=... Print extra help, if available, based on comma-separated option names. Pass * to show all options that contain extra | |
| help. Default: None | |
| -H:PrintGraph=File Where IdealGraphVisualizer graph dumps triggered by Dump or DumpOnError should be written. [Extra help available] | |
| -H:±PrintGraphFile Setting to true sets PrintGraph=file, setting to false sets PrintGraph=network. Default: + (enabled). | |
| -H:PrintGraphHost="127.0.0.1" Host part of the address to which graphs are dumped. | |
| -H:PrintGraphPort=4445 Port part of the address to which graphs are dumped in binary format. | |
| -H:±PrintGraphWithSchedule Schedule graphs as they are dumped. Default: - (disabled). | |
| -H:±PrintHeapHistogram Print class statistics of native image heap. Default: - (disabled). | |
| -H:±PrintIRWithLIR Print HIR along side LIR as the latter is generated. Default: - (disabled). | |
| -H:±PrintImageElementSizes Print the sizes of the elements of the built image. Default: - (disabled). | |
| -H:±PrintImageHeapPartitionSizes Print the sizes of the native image heap as the image is built. Default: - (disabled). | |
| -H:±PrintImageObjectTree Print image object hierarchy. Default: - (disabled). | |
| -H:±PrintJNIMethods Print JNI methods added to generated image. Default: - (disabled). | |
| -H:±PrintLIRWithAssembly Include the LIR as comments with the final assembly. Default: - (disabled). | |
| -H:±PrintMethodHistogram Print statistics of methods in native image heap. Default: - (disabled). | |
| -H:±PrintPointsToStatistics Report analysis statistics. Default: - (disabled). | |
| -H:±PrintProfilingInformation Print profiling information when parsing a method's bytecode. Default: - (disabled). | |
| -H:±PrintRestrictHeapAccessPath Print path for @RestrictHeapAccess warnings. Default: + (enabled). | |
| -H:±PrintRestrictHeapAccessWarnings Print warnings for @RestrictHeapAccess annotations. Default: + (enabled). | |
| -H:±PrintRuntimeCompileMethods Print call tree of methods available for runtime compilation. Default: - (disabled). | |
| -H:±PrintStaticTruffleBoundaries Print truffle boundaries found during the analysis. Default: - (disabled). | |
| -H:±PrintSynchronizedAnalysis Print types used for Java synchronization. Default: - (disabled). | |
| -H:±PrintUninterruptibleCalleeDOTGraph Print (to stderr) a DOT graph of the @Uninterruptible annotations. Default: - (disabled). | |
| -H:±PrintUniverse Print information about classes, methods, and fields that are present in the native image. Default: - (disabled). | |
| -H:±PrintUnmodifiedGraphs Dump a graph even if it has not changed since it was last dumped. Change detection is based on adding and deleting | |
| nodes or changing inputs. Default: + (enabled). | |
| -H:±ProfileAllocations Enable profiling of allocation sites. Default: - (disabled). | |
| -H:ProfileAllocationsContext=AllocatingMethod | |
| Control the naming and granularity of the counters when using ProfileAllocations. [Extra help available] | |
| -H:±ProfileAnalysisOperations Track the progress of the static analysis. Default: - (disabled). | |
| -H:±ProfileCompiledMethods Default: - (disabled). | |
| -H:±ProfileConstantObjects Track the creation of constant objects. Default: - (disabled). | |
| -H:±ProfileDeoptimization Print logging information during object file writing. Default: - (disabled). | |
| -H:±ProfileMonitors Enable profiling of monitor operations. Default: - (disabled). | |
| -H:QueryCodeDir="" Directory where query code for target platform should be output. | |
| -H:±RawConditionalElimination Default: + (enabled). | |
| -H:ReadEliminationMaxLoopVisits=5 | |
| -H:±ReassociateExpressions Re-associate loop invariants and constants. Default: + (enabled). | |
| -H:±ReduceDCE Disable optional dead code eliminations. Default: + (enabled). | |
| -H:ReflectionConfigurationFiles=<string>* One or several (comma-separated) paths to JSON files that specify which program elements should be made available via | |
| reflection. [Extra help available] | |
| -H:ReflectionConfigurationResources=<string>* | |
| Resources describing program elements to be made available for reflection (see ReflectionConfigurationFiles). | |
| -H:±ReflectionPluginTracing Enable trace logging for reflection plugins. Default: - (disabled). | |
| -H:RegisterPressure=... Comma separated list of registers that register allocation is limited to. Default: None | |
| -H:±RelaxTypeFlowStateConstraints Allow a type flow state to contain types not compatible with its declared type. Default: + (enabled). | |
| -H:±RemoveNeverExecutedCode Default: + (enabled). | |
| -H:±RemoveSaturatedTypeFlows Enable the type flow saturation analysis performance optimization. Default: + (enabled). | |
| -H:±RemoveUnusedSymbols Use linker option to prevent unreferenced symbols in image. Default: + (enabled). | |
| -H:±ReplaceInputsWithConstantsBasedOnStamps Default: + (enabled). | |
| -H:ReportAnalysisForbiddenType=<string>* Report error if <typename>[:<UsageKind>{,<UsageKind>}] is discovered during analysis (valid values for UsageKind: | |
| InHeap, Allocated, Reachable). | |
| -H:±ReportExceptionStackTraces Show exception stack traces for exceptions during image building.). Default: - (disabled). | |
| -H:±ReportPerformedSubstitutions Report performed substitutions. Default: - (disabled). | |
| -H:±ReportUnsafeOffsetWarnings Print unsafe operation offset warnings.). Default: - (disabled). | |
| -H:±ReportUnsupportedElementsAtRuntime Report usage of unsupported methods and fields at run time when they are accessed the first time, instead of as an error | |
| during image building. Default: - (disabled). | |
| -H:ResourceConfigurationFiles=<string>* Files describing Java resources to be included in the image. | |
| -H:ResourceConfigurationResources=<string>* Resources describing Java resources to be included in the image. | |
| -H:±ReturnAfterAnalysis Return after analysis. Default: - (disabled). | |
| -H:±RunReachabilityHandlersConcurrently Run reachability handlers concurrently during analysis. Default: + (enabled). | |
| -H:RuntimeAssertions=<string>* Enable or disable Java assert statements at run time. | |
| -H:RuntimeCheckedCPUFeatures=<string>* Comma separated list of CPU features that will be enabled for runtime checks. The native image may check at run time if | |
| such features are supported by the target CPU, and can optimize certain operations based on this information. If a | |
| feature is not supported at run time, a less optimized variant will be executed. Because of the presence of multiple | |
| code variants, enabling runtime features can result in larger executables. To completely turn off runtime checked CPU | |
| features, set this option to the empty string. The specific options available are target platform dependent. See | |
| --list-cpu-features for feature list. The default values are: AMD64: 'AVX,AVX2'; AArch64: ''. | |
| -H:±RuntimeSystemAssertions Enable or disable Java system assertions at run time. Default: - (disabled). | |
| -H:±ScanObjectsParallel Object scanning in parallel. Default: + (enabled). | |
| -H:SerializationConfigurationFiles=<string>* One or several (comma-separated) paths to JSON files that specify lists of serialization configurations. [Extra help | |
| available] | |
| -H:SerializationConfigurationResources=<string>* | |
| Resources describing program elements to be made available for serialization (see SerializationConfigurationFiles). | |
| -H:SerializationDenyConfigurationFiles=<string>* | |
| One or several (comma-separated) paths to JSON files that specify lists of serialization configurations. [Extra help | |
| available] | |
| -H:SerializationDenyConfigurationResources=<string>* | |
| Resources describing program elements that must not be made available for serialization. | |
| -H:ServiceLoaderFeatureExcludeServiceProviders=<string>* | |
| Comma-separated list of service providers that should be excluded. | |
| -H:ServiceLoaderFeatureExcludeServices=<string>* | |
| Comma-separated list of services that should be excluded. | |
| -H:±SharedLibrary Build shared library. Default: - (disabled). | |
| -H:ShowConfiguration=none Writes to the VM log information about the compiler configuration selected. | |
| -H:±ShowDumpFiles Print the name of each dump file path as it's created. Default: - (disabled). | |
| -H:±ShowSubstitutionSourceInfo Controls whether the source position information of snippets and method substitutions are exposed to HotSpot. Can be | |
| useful when profiling to get more precise position information. Default: - (disabled). | |
| -H:±SimpleFastInflatedLocking Handle simple cases for inflated monitors in the fast-path. Default: + (enabled). | |
| -H:SmallCompiledLowLevelGraphSize=330 If the previous low-level graph size of the method exceeds the threshold, it is not inlined. | |
| -H:±SnippetCounters Enable counters for various paths in snippets. Default: - (disabled). | |
| -H:SoftRefLRUPolicyMSPerMB=1000 Soft references: this number of milliseconds multiplied by the free heap memory in MByte is the time span for which a | |
| soft reference will keep its referent alive after its last access. | |
| -H:±SourceLevelDebug Preserve the local variable information for every Java source line to allow line-by-line stepping in the debugger. Allow | |
| the lookup of Java-level method information, e.g., in stack traces. Default: - (disabled). | |
| -H:SourceLevelDebugFilter=<string>* Constrain debug info generation to the comma-separated list of package prefixes given to this option. | |
| -H:±SpawnIsolates Support multiple isolates. | |
| -H:SpectrePHTBarriers=None Select a strategy to mitigate speculative bounds check bypass (aka Spectre-PHT or Spectre V1). [Extra help available] | |
| -H:±SpectrePHTIndexMasking Mask indices to scope access to allocation size after bounds check. Default: - (disabled). | |
| -H:±SpeculativeGuardMovement Move loop invariant guards (e.g., array bounds checks) out of loops. Default: + (enabled). | |
| -H:StackRedZoneSize=8192 Size (in bytes) of the red zone reserved at the end of the stack. This stack space can only be used by critical VM code | |
| and C code, e.g., to report fatal errors. | |
| -H:±StackTrace Provide method names for stack traces. Default: + (enabled). | |
| -H:StackYellowZoneSize=32768 Size (in bytes) of the yellow zone reserved at the end of the stack. This stack space is reserved for VM use and cannot | |
| be used by the application. | |
| -H:±StaticExecutable Build statically linked executable (requires static libc and zlib). Default: - (disabled). | |
| -H:±StaticExecutableWithDynamicLibC Builds a statically linked executable with libc dynamically linked. Default: - (disabled). | |
| -H:±StressExplicitExceptionCode Stress the code emitting explicit exception throwing code. Default: - (disabled). | |
| -H:±StressInvokeWithExceptionNode Stress the code emitting invokes with explicit exception edges. Default: - (disabled). | |
| -H:±StressTestEarlyReads Stress the code by emitting reads at earliest instead of latest point. Default: - (disabled). | |
| -H:±StrictConfiguration Causes unknown attributes in configuration objects to abort the image build instead of emitting a warning. Default: - | |
| (disabled). | |
| -H:±StrictDeoptInsertionChecks Perform checks that guards and deopts aren't introduced in graphs that should handle exceptions explicitly. Default: - | |
| (disabled). | |
| -H:±StrictQueryCodeCompilation Use strict checks when performing query code compilation. Default: + (enabled). | |
| -H:StringIndexOfConstantLimit=4096 String.indexOf invocations will be evaluated at compile time if the receiver is a constant and its length is smaller | |
| than this value. | |
| -H:SubstrateVirtualThreadsParallelism=... For internal usage. Instead, use the equivalent property 'jdk.virtualThreadScheduler.parallelism' as specified by JEP | |
| 425 Virtual Threads (Project Loom). Default: None | |
| -H:±SupportCompileInIsolates Support runtime compilation in separate isolates (enable at runtime with option CompileInIsolates). | |
| -H:±SupportContinuations Support continuations (without requiring a Project Loom JDK). Default: - (disabled). | |
| -H:±SupportJsrBytecodes Default: + (enabled). | |
| -H:±SupportOSRWithLocks Support OSR compilations with locks. If DeoptAfterOSR is true we can per definition not have unbalanced enter/exits | |
| mappings. If DeoptAfterOSR is false insert artificial monitor enters after the OSRStart to have balanced enter/exits in | |
| the graph. Default: + (enabled). | |
| -H:±SupportPredefinedClasses Enable support for predefining additional classes. Default: + (enabled). | |
| -H:±SupportRecurringCallback Support a per-thread timer that is called at a specific interval. Default: + (enabled). | |
| -H:±SuppressStderr Suppress console error output for unittests. Default: - (disabled). | |
| -H:±SuppressStdout Suppress console normal output for unittests. Default: - (disabled). | |
| -H:TargetPlatform="" Selects native-image compilation target (in <OS>-<architecture> format). Defaults to host's OS-architecture pair. | |
| -H:TempDirectory="" Directory for temporary files generated during native image generation. If this option is specified, the temporary files | |
| are not deleted so that you can inspect them after native image generation. | |
| -H:±ThrowUnsafeOffsetErrors Throw unsafe operation offset errors.). Default: + (enabled). | |
| -H:Time=... Pattern for specifying scopes in which timing is enabled. See the Dump option for the pattern syntax. An empty value | |
| enables all timers unconditionally. Default: None | |
| -H:TimedDynamicCounters=-1 Turn on the benchmark counters, and displays the results every n milliseconds. | |
| -H:Timers=... Comma separated names of timers that are enabled irrespective of the value for Time option. An empty value enables all | |
| timers unconditionally. Default: None | |
| -H:TraceBytecodeParserLevel=0 The trace level for the bytecode parser. A value of 1 enables instruction tracing and any greater value emits a frame | |
| state trace just prior to each instruction trace.Instruction tracing output from multiple compiler threads will be | |
| interleaved so use of this option make most sense for single threaded compilation. The MethodFilter option can be used | |
| to refine tracing to selected methods. | |
| -H:TraceClassInitialization="" Comma-separated list of fully-qualified class names that class initialization is traced for. | |
| -H:±TraceEscapeAnalysis Default: - (disabled). | |
| -H:±TraceExceptionHandlerStub Trace execution of stub used to handle an exception thrown by a callee. Default: - (disabled). | |
| -H:±TraceInlineDuringParsing Traces inlining performed during bytecode parsing. Default: - (disabled). | |
| -H:±TraceInlining Enable tracing of inlining decisions. Default: - (disabled). [Extra help available] | |
| -H:±TraceInliningForStubsAndSnippets Enable inlining decision tracing in stubs and snippets. Default: - (disabled). | |
| -H:TraceLIRGeneratorLevel=0 The trace level for the LIR generator. | |
| -H:±TraceLocalizationFeature When enabled, localization feature details are printed. Default: - (disabled). | |
| -H:±TraceLoggingFeature When enabled, logging feature details are printed. Default: - (disabled). | |
| -H:TraceMonitorsMethodFilter=... Trace monitor operations in methods whose fully qualified name contains this substring. Default: None | |
| -H:TraceMonitorsTypeFilter=... Trace monitor operations on objects whose type contains this substring. Default: None | |
| -H:±TraceNativeToolUsage Trace all native tool invocations as part of image building. Default: - (disabled). | |
| -H:TraceObjectInstantiation="" Comma-separated list of fully-qualified class names that object instantiation is traced for. | |
| -H:±TraceParserPlugins Traces use of plugins during bytecode parsing. Default: - (disabled). | |
| -H:±TraceSecurityServices Enable tracing of security services automatic registration. Default: - (disabled). | |
| -H:±TraceServiceLoaderFeature When enabled, each service loader resource and class will be printed out to standard output. Default: - (disabled). | |
| -H:±TraceUnwindStub Trace execution of the stub that routes an exception to a handler in the calling frame. Default: - (disabled). | |
| -H:±TraceVMOperations Trace VMOperation execution. Default: - (disabled). | |
| -H:±TrackAccessChain Track the callers for methods and accessing methods for fields. Default: - (disabled). | |
| -H:±TrackInputFlows Track the input for type flows. Default: - (disabled). | |
| -H:TrackMemUse=... Pattern for specifying scopes in which memory use tracking is enabled. See the Dump option for the pattern syntax. An | |
| empty value enables all memory use trackers unconditionally. Default: None | |
| -H:±TrackNodeInsertion Track source stack trace where a node was inserted into the graph. Default: - (disabled). | |
| -H:±TrackNodeSourcePosition Track the NodeSourcePosition. Default: - (disabled). | |
| -H:±TreatRuntimeCodeInfoReferencesAsWeak Determines if references from runtime-compiled code to Java heap objects should be treated as strong or weak. Default: + | |
| (enabled). | |
| -H:TrivialInliningSize=10 Graphs with less than this number of nodes are trivial and therefore always inlined. | |
| -H:±TruffleCheckBlackListedMethods Fail if a method known as not suitable for partial evaluation is reachable for runtime compilation. Default: + | |
| (enabled). | |
| -H:±TruffleCheckBlockListMethods Fail if a method known as not suitable for partial evaluation is reachable for runtime compilation. Default: + | |
| (enabled). | |
| -H:±TruffleCheckFrameImplementation Enforce that the Truffle runtime provides the only implementation of Frame. Default: + (enabled). | |
| -H:±TruffleCheckNeverPartOfCompilation Check that CompilerAsserts.neverPartOfCompilation is not reachable for runtime compilation. Default: + (enabled). | |
| -H:TruffleCompilerConfiguration=... Select a compiler configuration for Truffle compilation (default: use Graal system compiler configuration). Default: | |
| None | |
| -H:±TruffleHostInlining Whether Truffle host inlining is enabled. Default: + (enabled). | |
| -H:TruffleHostInliningBaseBudget=5000 Maximum budget for Truffle host inlining for runtime compiled methods. | |
| -H:TruffleHostInliningByteCodeInterpreterBudget=100000 | |
| Maximum budget for Truffle host inlining for runtime compiled methods with a BytecodeInterpreterSwitch annotation. | |
| -H:TruffleHostInliningMaxExplorationDepth=1000 | |
| Determines the maximum call depth for exploration during host inlining. | |
| -H:±TruffleHostInliningPrintExplored When logging is activated for this phase enables printing of only explored, but ultimately not inlined call trees. | |
| Default: - (disabled). | |
| -H:±TruffleInlineDuringParsing Inline trivial methods in Truffle graphs during native image generation. Default: + (enabled). | |
| -H:±TruffleMultiThreaded Enable support for Truffle background compilation. Default: + (enabled). | |
| -H:±TrufflePropagateCompilationErrors Propagate Truffle compilation errors. Default: - (disabled). | |
| -H:±TrustFinalDefaultFields Determines whether to treat final fields with default values as constant. Default: + (enabled). | |
| -H:TypeCheckMaxHints=2 The maximum number of profiled types that will be used when compiling a profiled type check. Note that | |
| TypeCheckMinProfileHitProbability also influences whether profiling info is used in compiled type checks. | |
| -H:TypeCheckMinProfileHitProbability=0.5 If the probability that a type check will hit one the profiled types (up to TypeCheckMaxHints) is below this value, the | |
| type check will be compiled without profiling info. | |
| -H:TypeFlowSaturationCutoff=20 The maximum number of types recorded in a type flow. -1 indicates no limitation. | |
| -H:±UnresolvedIsError Report unresolved elements as errors. Default: + (enabled). | |
| -H:UnrollMaxIterations=16 | |
| -H:UnsafeAutomaticSubstitutionsLogLevel=1 Unsafe automatic substitutions logging level: Disabled=0, Basic=1, Info=2, Debug=3.). | |
| -H:±UnsafeOffsetWarningsAreFatal Print unsafe operation offset warnings.). Default: - (disabled). | |
| -H:±UseApplicationCodeSourceLocation Return the application path as the Class.getProtectionDomain().getCodeSource().getLocation() for all classes that have | |
| no explicit ProtectionDomain. | |
| -H:±UseBranchesWithin32ByteBoundary Force branch instructions to align with 32-bytes boundary, to mitigate the jcc erratum. See | |
| https://www.intel.com/content/dam/support/us/en/documents/processors/mitigations-jump-conditional-code-erratum.pdf for | |
| more details. If not set explicitly, the default value will be determined according to the CPU model. Default: - | |
| (disabled). | |
| -H:±UseCAPCache Indicate the C Annotation Processor to use previously cached native information when generating C Type information. | |
| Default: - (disabled). | |
| -H:±UseCalleeSavedRegisters Use callee saved registers to reduce spilling for low-frequency calls to stubs (if callee saved registers are supported | |
| by the architecture). Default: + (enabled). | |
| -H:±UseCompilationStatistics Enables CompilationStatistics. Default: - (disabled). | |
| -H:±UseCompressedFrameEncodings Use compressed frame encoding for frames without local values. Default: + (enabled). | |
| -H:±UseContainerSupport Enable detection and runtime container configuration support. Default: + (enabled). | |
| -H:±UseDedicatedVMOperationThread Determines if VM operations should be executed in a dedicated thread. Default: - (disabled). | |
| -H:±UseDirectCallTrampolinesALot Force many trampolines to be needed for inter-method calls. Normally trampolines are only used when a method destination | |
| is outside the range of a pc-relative branch instruction. Default: - (disabled). | |
| -H:±UseEpsilonGC Use a no-op GC. Default: - (disabled). | |
| -H:±UseExceptionProbability Default: + (enabled). | |
| -H:±UseGraalStubs Use Graal-generated stubs for complicated LIR operations instead of embedding all the emitted code. Default: + | |
| (enabled). | |
| -H:UseLibC=... Selects the libc implementation to use. Available implementations: glibc, musl, bionic. Default: None | |
| -H:±UseLoom Build with Project Loom JDK. Default: - (disabled). | |
| -H:±UseLoopEndFrequencies Derive loop frequencies only from backedge frequencies instead of from loop exit frequencies. Default: - (disabled). | |
| -H:±UseLoopLimitChecks Default: + (enabled). | |
| -H:±UseNullRegion Determines if a null region is present between the heap base and the image heap. Default: + (enabled). | |
| -H:±UseRememberedSet Determines if a remembered sets is used, which is necessary for collecting the young and old generation independently. | |
| Default: + (enabled). | |
| -H:±UseSerialGC Use a serial GC. Default: + (enabled). | |
| -H:±UseServiceLoaderFeature Automatically register services for run-time lookup using ServiceLoader. Default: + (enabled). | |
| -H:±UseSnippetGraphCache Use a cache for snippet graphs. Default: + (enabled). | |
| -H:±UseSnippetTemplateCache Use a LRU cache for snippet templates. Default: + (enabled). | |
| -H:±UseTrappingNullChecks Use traps for null checks instead of explicit null-checks. Default: + (enabled). | |
| -H:±UseTypeCheckHints Default: + (enabled). | |
| -H:Verify=... Pattern for specifying scopes in which logging is enabled. See the Dump option for the pattern syntax. Default: None | |
| -H:±VerifyBalancedMonitors Emit extra code to dynamically check monitor operations are balanced. Default: - (disabled). | |
| -H:±VerifyDeoptimizationEntryPoints Verify that all possible deoptimization entry points have been properly compiled and registered in the metadata. | |
| Default: - (disabled). | |
| -H:±VerifyGraalGraphEdges Perform expensive verification of graph inputs, usages, successors and predecessors. Default: - (disabled). | |
| -H:±VerifyGraalGraphs Verify graphs often during compilation when assertions are turned on. Default: + (enabled). | |
| -H:±VerifyGraalPhasesSize Verify before - after relation of the relative, computed, code size of a graph. Default: - (disabled). | |
| -H:±VerifyHeap Verify the heap before and after each collection. Default: - (disabled). | |
| -H:±VerifyHeapAtReturn Perform platform dependent validation of the Java heap at returns. Default: - (disabled). | |
| -H:±VerifyKillCFGUnusedNodes Verify that there are no new unused nodes when performing killCFG. Default: - (disabled). | |
| -H:±VerifyNamingConventions Verify naming conventions during image construction. Default: - (disabled). | |
| -H:±VerifyPhases Default: - (disabled). | |
| -H:±VerifyReferences Verify all object references if VerifyHeap is enabled. Default: + (enabled). | |
| -H:±VerifyRememberedSet Verify the remembered set if VerifyHeap is enabled. Default: + (enabled). | |
| -H:±VerifyTypes Verify type states computed by the static analysis at run time. This is useful when diagnosing problems in the static | |
| analysis, but reduces peak performance significantly. Default: - (disabled). | |
| -H:±VerifyWriteBarriers Verify write barriers. Default: - (disabled). | |
| -H:±WarnMissingIntrinsic Print a warning when a missing intrinsic is seen. Default: - (disabled). | |
| -H:±ZapChunks Fill unused memory chunks with a sentinel value. Default: - (disabled). | |
| -H:±ZapConsumedHeapChunks After use, Fill memory chunks with a sentinel value. Default: - (disabled). | |
| -H:±ZapProducedHeapChunks Before use, fill memory chunks with a sentinel value. Default: - (disabled). | |
| -H:±ZapStackOnMethodEntry Default: - (disabled). | |
| -R:ASMInstructionProfiling=... Enables instruction profiling on assembler level. Valid values are a comma separated list of supported instructions. | |
| Compare with subclasses of Assembler.InstructionCounter. Default: None | |
| -R:±AbortOnBenchmarkCounterOverflow Abort VM with SIGILL if benchmark counters controlled by the (Generic|Timed|Benchmark)DynamicCounters. Default: - | |
| (disabled). [Extra help available] | |
| -R:ActiveProcessorCount=-1 Overwrites the available number of processors provided by the OS. Any value <= 0 means using the processor count from | |
| the OS. | |
| -R:AggregatedMetricsFile=... File to which aggregated metrics are dumped at shutdown. A CSV format is used if the file ends with .csv otherwise a | |
| more human readable format is used. If not specified, metrics are dumped to the console. Default: None | |
| -R:±AliasArrayTypeFlows Model all array type flows using a unique elements type flow abstraction. Default: + (enabled). | |
| -R:AllocationProfilingThreshold=1048576 The minimum size in bytes required for printing an allocation profiling entry. | |
| -R:±AllocationSiteSensitiveHeap A context sensitive heap means that each heap allocated object is modeled by using at least the allocation site. | |
| Default: - (disabled). | |
| -R:±AlwaysInlineIntrinsics Unconditionally inline intrinsics. Default: - (disabled). | |
| -R:±AlwaysInlineVTableStubs Default: - (disabled). | |
| -R:AnalysisContextSensitivity="insens" Controls the static analysis context sensitivity. Available values: insens (context insensitive analysis), allocsens | |
| (context insensitive analysis, context insensitive heap, allocation site sensitive heap), _1obj (1 object sensitive | |
| analysis with a context insensitive heap), _2obj1h (2 object sensitive with a 1 context sensitive heap). | |
| -R:AnalysisSizeCutoff=8 The maximum size of type and method profiles returned by the static analysis. -1 indicates no limitation. | |
| -R:AnalysisStatisticsFile=... Analysis results statistics file. Default: None | |
| -R:ArrayRegionEqualsConstantLimit=4096 Array region equality checks will be evaluated at compile time if the receiver is a constant and its length is smaller | |
| than this value. | |
| -R:±AutomaticReferenceHandling Determines if the reference handling is executed automatically or manually. Default: + (enabled). | |
| -R:±BenchmarkCounterPrintingCutoff Use a cutoff to print only most significant counters. Default: + (enabled). | |
| -R:±BenchmarkCountersDumpDynamic Dump dynamic counters. Default: + (enabled). | |
| -R:±BenchmarkCountersDumpStatic Dump static counters. Default: - (disabled). | |
| -R:BenchmarkCountersFile=... File to which benchmark counters are dumped. A CSV format is used if the file ends with .csv otherwise a more human | |
| readable format is used. The fields in the CSV format are: category, group, name, value. Default: None | |
| -R:BenchmarkDynamicCounters=... Turn on the benchmark counters. The format of this option is:. Default: None [Extra help available] | |
| -R:±BootstrapInitializeOnly Do not compile anything on bootstrap but just initialize the compiler. Default: - (disabled). | |
| -R:BootstrapTimeout=15.0 Maximum time in minutes to spend bootstrapping (0 to disable this limit). | |
| -R:BootstrapWatchDogCriticalRateRatio=0.25 Ratio of the maximum compilation rate below which the bootstrap compilation rate must not fall (0 or less disables | |
| monitoring). | |
| -R:±CanOmitFrame Default: + (enabled). | |
| -R:±CanonicalGraphStringsCheckConstants Exclude virtual nodes when dumping canonical text for graphs. Default: - (disabled). | |
| -R:±CanonicalGraphStringsExcludeVirtuals Exclude virtual nodes when dumping canonical text for graphs. Default: + (enabled). | |
| -R:±CanonicalGraphStringsRemoveIdentities Attempts to remove object identity hashes when dumping canonical text for graphs. Default: + (enabled). | |
| -R:±ClearMetricsAfterBootstrap Clear the debug metrics after bootstrap. Default: - (disabled). | |
| -R:±CollectImageBuildStatistics Collect information during image build about devirtualized invokes and bytecode exceptions. Default: - (disabled). | |
| -R:±CollectYoungGenerationSeparately Determines if a full GC collects the young generation separately or together with the old generation. | |
| -R:±CompilationBailoutAsFailure Treat compilation bailouts like compilation failures. Default: - (disabled). | |
| -R:CompilationCountLimit=0 The number of compilations allowed for any method before the VM exits (a value of 0 means there is no limit). | |
| -R:CompilationExcludePhases=... Exclude certain phases from compilation, either unconditionally or with a method filter. Multiple exclusions can be | |
| specified separated by ':'. Phase names are matched as substrings, e.g.: | |
| CompilationExcludePhases=PartialEscape:Loop=A.*,B.foo excludes PartialEscapePhase from all compilations and any phase | |
| containing 'Loop' in its name from compilations of all methods in class A and of method B.foo. Default: None | |
| -R:CompilationExpirationPeriod=300 Time limit in seconds before a compilation expires (0 to disable the limit). A non-zero value for this option is doubled | |
| if assertions are enabled and quadrupled if DetailedAsserts is true. | |
| -R:CompilationFailureAction=Silent Specifies the action to take when compilation fails. [Extra help available] | |
| -R:CompilationIsolateAddressSpaceSize=0 Size of the reserved address space of each compilation isolate (0: default for new isolates). | |
| -R:CompilationWatchDogStackTraceInterval=60.0 | |
| Interval in seconds between a watch dog reporting stack traces for long running compilations. | |
| -R:CompilationWatchDogStartDelay=0.0 Delay in seconds before watch dog monitoring a compilation (0 disables monitoring). | |
| -R:±CompileGraalWithC1Only In tiered mode compile Graal and JVMCI using optimized first tier code. Default: + (enabled). | |
| -R:±CompileInIsolates Activate runtime compilation in separate isolates (enable support during image build with option | |
| SupportCompileInIsolates). Default: + (enabled). | |
| -R:CompilerConfiguration=... Names the compiler configuration to use. If omitted, the compiler configuration with the highest auto-selection priority | |
| is used. To see the set of available configurations, supply the value 'help' to this option. Default: None | |
| -R:±ConditionalElimination Default: + (enabled). | |
| -R:ConditionalEliminationMaxIterations=4 | |
| -R:Count=... Pattern for specifying scopes in which counters are enabled. See the Dump option for the pattern syntax. An empty value | |
| enables all counters unconditionally. Default: None | |
| -R:Counters=... Comma separated names of counters that are enabled irrespective of the value for Count option. An empty value enables | |
| all counters unconditionally. Default: None | |
| -R:CrashAt=... Pattern for method(s) that will trigger an exception when compiled. This option exists to test handling compilation | |
| crashes gracefully. See the MethodFilter option for the pattern syntax. A ':Bailout' suffix will raise a bailout | |
| exception and a ':PermanentBailout' suffix will raise a permanent bailout exception. Default: None | |
| -R:±DebugStubsAndSnippets Enable debug output for stub code generation and snippet preparation. Default: - (disabled). | |
| -R:±DeoptALot Default: - (disabled). | |
| -R:±DeoptAfterOSR Deoptimize OSR compiled code when the OSR entry loop is finished if there is no mature profile available for the rest of | |
| the method. Default: + (enabled). | |
| -R:DeoptsToDisableOptimisticOptimization=40 | |
| -R:±DetailedAsserts Enable expensive assertions if normal assertions (i.e. -ea or -esa) are enabled. Default: - (disabled). | |
| -R:DiagnoseDumpLevel=3 Specify the dump level if CompilationFailureAction#Diagnose is used.See CompilationFailureAction for details. | |
| file:doc-files/CompilationFailureActionHelp.txt. | |
| -R:DiagnosticDetails="" Specifies how many details are printed for certain diagnostic thunks, e.g.: 'DumpThreads:1,DumpRegisters:2'. A value of | |
| 1 will result in the maximum amount of information, higher values will print less information. By default, the most | |
| detailed output is enabled for all diagnostic thunks. Wildcards (*) are supported in the name of the diagnostic thunk. | |
| -R:±DisableExplicitGC Ignore calls to System.gc(). Default: - (disabled). | |
| -R:±DisableIntercept Disable intercepting exceptions in debug scopes. Default: - (disabled). | |
| -R:DisableIntrinsics=... Disable intrinsics matching the given method filter (see MethodFilter option for details). For example, | |
| 'DisableIntrinsics=String.equals' disables intrinsics for any method named 'equals' in a class whose simple name is | |
| 'String'. You can append ':verbose' at the end of the filter value to print out disabled intrinsics as they are | |
| encountered during compilation (e.g., 'String.equals:verbose'). Default: None | |
| -R:±DivertParameterReturningMethod Analysis: Detect methods that return one of their parameters and hardwire the parameter straight to the return. Default: | |
| + (enabled). | |
| -R:Dump=... Filter pattern for specifying scopes in which dumping is enabled. Default: None [Extra help available] | |
| -R:±DumpAfterEveryBCI Dump the current graph after every bci to IGV. Default: - (disabled). | |
| -R:±DumpEndVersusExitLoopFrequencies Debug flag to dump loop frequency differences computed based on loop end or exit nodes.If the frequencies diverge a lot, | |
| this may indicate missing profiles on control flowinside the loop body. Default: - (disabled). | |
| -R:±DumpHeapAndExit Create a heap dump and exit. Default: - (disabled). | |
| -R:±DumpOnError Send compiler IR to dump handlers on error. Default: - (disabled). | |
| -R:DumpOnPhaseChange=... Dump a before and after graph if the named phase changes the graph.%nThe argument is substring matched against the | |
| simple name of the phase class. Default: None | |
| -R:DumpPath="graal_dumps" The directory where various Graal dump files are written. | |
| -R:±DumpingErrorsAreFatal Treat any exceptions during dumping as fatal. Default: - (disabled). | |
| -R:±DynamicCountersPrintGroupSeparator Use grouping separators for number printing. Default: + (enabled). | |
| -R:±EagerSnippets Eagerly construct extra snippet info. Default: - (disabled). | |
| -R:±EarlyCodeEmissionOrder Enable early code emission order computation instead of late code emission order computation. Default: - (disabled). | |
| -R:±EarlyGVN Perform early global value numbering. Default: - (disabled). | |
| -R:±EarlyLICM Perform early loop invariant code motion. Default: - (disabled). | |
| -R:±EmitStringSubstitutions Emit substitutions for String methods. Default: + (enabled). | |
| -R:±EnableSignalHandling Enables signal handling. | |
| -R:EscapeAnalysisIterations=2 | |
| -R:EscapeAnalysisLoopCutoff=20 | |
| -R:EscapeAnalyzeOnly=... Default: None | |
| -R:ExactFullUnrollMaxNodes=800 | |
| -R:ExactPartialUnrollMaxNodes=200 | |
| -R:±ExhaustiveHeapScan Scan all objects reachable from roots for analysis. By default false. Default: - (disabled). | |
| -R:±ExitOnOutOfMemoryError Exit on the first occurrence of an out-of-memory error that is thrown because the Java heap is out of memory. Default: - | |
| (disabled). | |
| -R:±ExitVMOnException Alias for CompilationFailureAction=ExitVM. Default: - (disabled). | |
| -R:±ExtendedAsserts Enable extended asserts which slow down analysis. Default: - (disabled). | |
| -R:±FailedLoopExplosionIsFatal Do not bail out but throw an exception on failed loop explosion. Default: - (disabled). | |
| -R:FallbackExecutorRuntimeJavaArg=<string>* Internal option used to specify runtime java arguments for FallbackExecutor. | |
| -R:±FlightRecorder Enable Java Flight Recorder. Default: - (disabled). | |
| -R:FlightRecorderLogging="all=warning" Usage: -XX:FlightRecorderLogging=[tag1[+tag2...][*][=level][,...]]. [Extra help available] | |
| -R:±FloatingDivNodes Try to float non-constant division operations to expose global value numbering of divisions. Default: + (enabled). | |
| -R:±ForceAdversarialLayout Place N-byte constants in the data section such that they are misaligned with respect to N*2. For example, place 4 byte | |
| constants at offset 4, 12 or 20, etc. This layout is used to detect instructions that load constants with alignment | |
| smaller than the fetch size. For instance, an XORPS instruction that does a 16-byte fetch of a 4-byte float not aligned | |
| to 16 bytes will cause a segfault. Default: - (disabled). | |
| -R:±ForceDumpGraphsBeforeCompilation Force-dump graphs before compilation. Default: - (disabled). | |
| -R:±FullUnroll Default: + (enabled). | |
| -R:FullUnrollConstantCompareBoost=15 | |
| -R:FullUnrollMaxApplication=60 | |
| -R:FullUnrollMaxIterations=600 | |
| -R:FullUnrollMaxNodes=400 | |
| -R:GCDebugStartCycle=-1 Start tracing compiled GC barriers after N garbage collections (disabled if N <= 0). | |
| -R:±GenLoopSafepoints Default: + (enabled). | |
| -R:±GenericDynamicCounters Turn on the benchmark counters, and displays the results on VM shutdown. Default: - (disabled). | |
| -R:±GraalArithmeticStubs Use Graal arithmetic stubs instead of HotSpot stubs where possible. Default: + (enabled). | |
| -R:GraalCompileOnly=... A filter applied to a method the VM has selected for compilation by Graal. A method not matching the filter is | |
| redirected to a lower tier compiler. The filter format is the same as for the MethodFilter option. Default: None | |
| -R:GraphCompressionThreshold=70 Graal graph compression is performed when percent of live nodes falls below this value. | |
| -R:±GuardPriorities Default: + (enabled). | |
| -R:HeapVerifierVerbosity=0 Control heap verifier verbosity level: 0 - quiet, 1 - info, 2 - warning, 3 - all. | |
| -R:±HotSpotDeoptExplicitExceptions Testing only option that forces deopts for exception throws. Default: - (disabled). | |
| -R:±HotSpotPostOnExceptions Testing only option that forces deopts for exception throws. Default: - (disabled). | |
| -R:±HotSpotPrintInlining Print inlining optimizations. Default: - (disabled). | |
| -R:±HybridStaticContext Enable hybrid context for static methods, i.e. uses invocation site as context for static methods. Default: - | |
| (disabled). | |
| -R:ImageBuildStatisticsFile=... File for printing image build statistics. Default: None | |
| -R:ImageObjectTreeExpandRoots="" Override the default suppression of specified roots. See: Reports.md. | |
| -R:ImageObjectTreeExpandTypes="" Override the default suppression of specified types. See: Reports.md. | |
| -R:ImageObjectTreeSuppressRoots="" Suppress the expansion of specified roots. See: Reports.md. | |
| -R:ImageObjectTreeSuppressTypes="" Suppress the expansion of specified types. See: Reports.md. | |
| -R:±Inline Enable inlining. Default: + (enabled). | |
| -R:±InlineBeforeAnalysis Inline methods before static analysis. Default: + (enabled). | |
| -R:±InlineDuringParsing Inlines trivial methods during bytecode parsing. Default: + (enabled). | |
| -R:InlineDuringParsingMaxDepth=10 Maximum depth when inlining during bytecode parsing. | |
| -R:±InlineEverything Default: - (disabled). | |
| -R:±InlineMegamorphicCalls Inline calls with megamorphic type profile (i.e., not all types could be recorded). Default: + (enabled). | |
| -R:±InlineMonomorphicCalls Inline calls with monomorphic type profile. Default: + (enabled). | |
| -R:±InlinePartialIntrinsicExitDuringParsing Inlines partial intrinsic exits during bytecode parsing when possible. A partial intrinsic exit is a call within an | |
| intrinsic to the method being intrinsified and denotes semantics of the original method that the intrinsic does not | |
| support. Default: + (enabled). | |
| -R:±InlinePolymorphicCalls Inline calls with polymorphic type profile. Default: + (enabled). | |
| -R:±InlineVTableStubs Default: + (enabled). | |
| -R:InliningDepthError=1000 Maximum inlining depth during partial evaluation before reporting an infinite recursion. | |
| -R:InspectServerContentPath="inspect" Path to the contents of the Inspect web server. | |
| -R:±InstallSegfaultHandler Install segfault handler that prints register contents and full Java stacktrace. Default: enabled for an executable, | |
| disabled for a shared library. | |
| -R:±InterceptBailout Intercept also bailout exceptions. Default: - (disabled). | |
| -R:±Intrinsify Use compiler intrinsifications. Default: + (enabled). | |
| -R:IsolatedLoopHeaderAlignment=32 Alignment in bytes for loop header blocks that have no fall through paths. | |
| -R:IterativePeelingLimit=2 Allow iterative peeling of loops up to this many times (each time the peeling phase runs). | |
| -R:±LIRDynMoveProfileMethod Enable dynamic move profiling per method. Default: - (disabled). | |
| -R:±LIROptConstantLoadOptimization Enable constant load optimization. | |
| -R:±LIROptControlFlowOptimizer | |
| -R:±LIROptEdgeMoveOptimizer | |
| -R:±LIROptLSRAEliminateSpillMoves Enable spill move elimination. | |
| -R:±LIROptLSRAOptimizeSpillPosition Enable spill position optimization. | |
| -R:±LIROptLSStackSlotAllocator Use linear scan stack slot allocation. | |
| -R:±LIROptNullCheckOptimizer | |
| -R:±LIROptRedundantMoveElimination | |
| -R:±LIROptStackMoveOptimizer | |
| -R:±LIROptimization Enable LIR level optimizations. Default: + (enabled). | |
| -R:±LIRProfileMethods Enables profiling of methods. Default: - (disabled). | |
| -R:±LIRProfileMoves Enables profiling of move types on LIR level. Move types are for example stores (register to stack), constant loads | |
| (constant to register) or copies (register to register). Default: - (disabled). | |
| -R:±LSRAOptSplitOnly LSRA optimization: Only split but do not reassign. Default: - (disabled). | |
| -R:±LSRAOptimization Enable LSRA optimization. Default: - (disabled). | |
| -R:LimitInlinedInvokes=5.0 | |
| -R:±LimitObjectArrayLength Enable a limit for the number of objects recorded for each type of a type state before disabling heap sensitivity for | |
| that type. The analysis must be heap sensitive. Default: - (disabled). | |
| -R:±ListMetrics Lists on the console at VM shutdown the metric names available to the Timers, Counters and MemUseTrackers options. Note | |
| that this only lists the metrics that were initialized during the VM execution and so will not include metrics for | |
| compiler code that is not executed. Default: - (disabled). | |
| -R:±LoadExceptionObjectInVM Use a VM runtime call to load and clear the exception object from the thread at the start of a compiled exception | |
| handler. Default: - (disabled). | |
| -R:Log=... Pattern for specifying scopes in which logging is enabled. See the Dump option for the pattern syntax. Default: None | |
| -R:LogFile=... File to which logging is sent. A %p in the name will be replaced with a string identifying the process, usually the | |
| process id and %t will be replaced by System.currentTimeMillis(). If the current runtime is in an isolate, then %i will | |
| be replaced by '<isolate id>' otherwise %i is removed. An %I is the same as %i except that the replacement is '<isolate | |
| id>@<isolate address>'. Using %o as filename sends logging to System.out whereas %e sends logging to System.err. | |
| Default: None | |
| -R:±LogVerbose Enable more verbose log output when available. Default: - (disabled). | |
| -R:LoopExitVsLoopEndFrequencyDiff=1000.0 Scaling factor of frequency difference computed based on loop ends or exits. | |
| -R:LoopHeaderAlignment=16 Alignment in bytes for loop header blocks. | |
| -R:LoopMaxUnswitch=3 | |
| -R:±LoopOnFatalError Execute an endless loop before printing diagnostics for a fatal error. Default: - (disabled). | |
| -R:±LoopPeeling Default: + (enabled). | |
| -R:±LoopPredication Hoists array bounds checks out of simple loops. This is ignored if SpeculativeGuardMovement is enabled. Default: + | |
| (enabled). | |
| -R:±LoopPredicationMainPath Restricts LoopPredication to only focus on array bounds checks that dominate the back edge of a loop. Default: + | |
| (enabled). | |
| -R:±LoopUnswitch Default: + (enabled). | |
| -R:LoopUnswitchFrequencyBoost=10.0 Number of nodes allowed for a loop unswitching per loop frequency. The number of nodes allowed for the unswitching is | |
| proportional to the relative frequency of the loop by this constant. | |
| -R:LoopUnswitchFrequencyMaxFactor=0.95 Maximun value for the frequency factor of an invariant. | |
| -R:LoopUnswitchFrequencyMinFactor=0.05 Minimum value for the frequency factor of an invariant. | |
| -R:LoopUnswitchMaxIncrease=2000 Maximum loop unswitching code size increase in nodes. | |
| -R:LoopUnswitchMinSplitFrequency=1.0 Lower bound for the minimun frequency of an invariant condition to be unswitched. | |
| -R:LoopUnswitchTrivial=10 Number of nodes allowed for a loop unswitching regardless of the loop frequency. | |
| -R:±MatchExpressions Allow backend to match complex expressions. Default: + (enabled). | |
| -R:MaxCallingContextDepth=0 The maximum length of the methods context chains. | |
| -R:MaxCallingContextWidth=0 The maximum number of contexts to record for a method. It only affects the analysis when the max and min calling context | |
| depth are different. | |
| -R:MaxCompilationProblemsPerAction=2 The maximum number of compilation failures to handle with the action specified by CompilationFailureAction before | |
| changing to a less verbose action. This does not apply to the ExitVM action. | |
| -R:MaxConstantObjectsPerType=100 The maximum number of constant objects recorded for each type before merging the constants into one unique constant | |
| object per type. The analysis must be heap sensitive. It has a minimum value of 1. | |
| -R:MaxDirectMemorySize=0 Maximum total size of NIO direct-buffer allocations. | |
| -R:MaxDuplicationFactor=2.0 Max amount of extra effort to expend handling irreducible loops. A value <= 1 disables support for irreducible loops. | |
| -R:MaxHeapContextDepth=0 The maximum length of the context used to model a heap object in addition to the allocation site; used only when | |
| ContextSensitiveHeap is enabled. | |
| -R:MaxHeapContextWidth=0 The maximum number of contexts to record for a heap object. It only affects the analysis when the max and min calling | |
| context depth are different. | |
| -R:MaxHeapFree=0 The maximum free bytes reserved for allocations, in bytes (0 for automatic according to GC policy). | |
| -R:MaxHeapSize=0 The maximum heap size at run-time, in bytes. | |
| -R:MaxJavaStackTraceDepth=1024 The maximum number of lines in the stack trace for Java exceptions (0 means all). | |
| -R:MaxNewSize=0 The maximum size of the young generation at run-time, in bytes. | |
| -R:MaxObjectSetSize=100 The maximum number of objects recorded for each type of a type state before disabling heap sensitivity for that type. | |
| The analysis must be heap sensitive. It has a minimum value of 1. | |
| -R:MaxTemplatesPerSnippet=50 | |
| -R:MaximumDesiredSize=20000 Maximum desired size of the compiler graph in nodes. | |
| -R:MaximumEscapeAnalysisArrayLength=128 The maximum length of an array that will be escape analyzed. | |
| -R:MaximumHeapSizePercent=80 The maximum heap size as percent of physical memory. | |
| -R:MaximumInliningSize=300 Inlining is explored up to this number of nodes in the graph for each call site. | |
| -R:MaximumLoopExplosionCount=10000 Max number of loop explosions per method. | |
| -R:MaximumRecursiveInlining=5 Maximum level of recursive inlining. | |
| -R:MaximumYoungGenerationSizePercent=10 The maximum size of the young generation as a percentage of the maximum heap size. | |
| -R:MegamorphicInliningMinMethodProbability=0.33 | |
| Minimum probability for methods to be inlined for megamorphic type profiles. | |
| -R:MemUseTrackers=... Comma separated names of memory usage trackers that are enabled irrespective of the value for TrackMemUse option. An | |
| empty value enables all memory usage trackers unconditionally. Default: None | |
| -R:MethodFilter=... Pattern for matching methods. The syntax for a pattern is:. Default: None [Extra help available] | |
| -R:±MethodFilterRootOnly Only check MethodFilter against the root method in the context if true, otherwise check all methods. Default: - | |
| (disabled). | |
| -R:MethodInlineBailoutLimit=5000 Per-compilation method inlining exploration limit before giving up (use 0 to disable). | |
| -R:MetricsFile=... File to which metrics are dumped per compilation. Default: None [Extra help available] | |
| -R:MinCallingContextDepth=0 The minimum length of the methods context chains. | |
| -R:MinHeapContextDepth=0 The minimum length of the context used to model a heap object in addition to the allocation site; used only when | |
| ContextSensitiveHeap is enabled. | |
| -R:MinHeapSize=0 The minimum heap size at run-time, in bytes. | |
| -R:MinimalBulkZeroingSize=2048 If applicable, use bulk zeroing instructions when the zeroing size in bytes exceeds this threshold. | |
| -R:MinimalGraphNodeSizeCheckSize=1000 Minimal size in NodeSize to check the graph size increases of phases. | |
| -R:MinimumPeelFrequency=0.35 | |
| -R:±MoveGuardsUpwards Move guard nodes to earlier places in the dominator tree if all successors of basic block share a common guard | |
| condition. Default: + (enabled). | |
| -R:NDCV=0 Run level for NoDeadCodeVerifyHandler (0 = off, 1 = info, 2 = verbose, 3 = fatal). | |
| -R:±NodeCounters Counts the number of instances of each node class. Default: - (disabled). | |
| -R:NonFatalIdenticalCompilationSnapshots=20 Number of contiguous identical compiler thread stack traces allowed before the VM exits on the basis of a stuck | |
| compilation. | |
| -R:ObjdumpExecutables=... Comma separated list of candidate GNU objdump executables. If not specified, disassembling via GNU objdump is disabled. | |
| Otherwise, the first existing executable in the list is used. Default: None | |
| -R:±OmitHotExceptionStacktrace Default: - (disabled). | |
| -R:±OptAssumptions Default: + (enabled). | |
| -R:±OptConvertDeoptsToGuards Default: + (enabled). | |
| -R:±OptDeoptimizationGrouping Default: + (enabled). | |
| -R:±OptDevirtualizeInvokesOptimistically Default: + (enabled). | |
| -R:±OptEarlyReadElimination Default: + (enabled). | |
| -R:±OptEliminateGuards Default: + (enabled). | |
| -R:±OptFloatingReads Default: + (enabled). | |
| -R:±OptImplicitNullChecks Default: + (enabled). | |
| -R:±OptReadElimination Default: + (enabled). | |
| -R:±OptScheduleOutOfLoops Default: + (enabled). | |
| -R:±PartialEscapeAnalysis Default: + (enabled). | |
| -R:±PartialUnroll Default: + (enabled). | |
| -R:±PeelALot Default: - (disabled). | |
| -R:PercentTimeInIncrementalCollection=50 Percentage of total collection time that should be spent on young generation collections. | |
| -R:±PreferContainerQuotaForCPUCount Calculate the container CPU availability based on the value of quotas (if set), when true. Otherwise, use the CPU shares | |
| value, provided it is less than quota. Default: + (enabled). | |
| -R:±PrintAnalysisCallTree Print analysis call tree, a breadth-first tree reduction of the call graph. Default: - (disabled). | |
| -R:PrintAnalysisCallTreeType=TXT Change the output format of the analysis call tree, available options are TXT and CSV. See: Reports.md. | |
| -R:±PrintAnalysisStatistics Print analysis results statistics. Default: - (disabled). | |
| -R:±PrintBackendCFG Enable dumping scheduled HIR, LIR, register allocation and code generation info to the C1Visualizer. Default: - | |
| (disabled). | |
| -R:±PrintBlockMapping Enable dumping CFG built during initial BciBlockMapping. Default: - (disabled). | |
| -R:±PrintCallEdges Print call edges with other analysis results statistics. Default: - (disabled). | |
| -R:PrintCanonicalGraphStringFlavor=0 Choose format used when dumping canonical text for graphs: 0 gives a scheduled graph (better for spotting changes | |
| involving the schedule) while 1 gives a CFG containing expressions rooted at fixed nodes (better for spotting small | |
| structure differences). | |
| -R:±PrintCanonicalGraphStrings Enable dumping canonical text from for graphs. Default: - (disabled). | |
| -R:±PrintCompilation Print an informational line to the console for each completed compilation. Default: - (disabled). | |
| -R:±PrintDetailedAllocationProfiling Print detailed information for each allocation site. Default: + (enabled). | |
| -R:PrintFlags=... Show available options based on comma-separated option-types (allowed categories: User, Expert, Debug). Default: None | |
| -R:PrintFlagsWithExtraHelp=... Print extra help, if available, based on comma-separated option names. Pass * to show all options that contain extra | |
| help. Default: None | |
| -R:±PrintGC Print summary GC information after each collection. Default: - (disabled). | |
| -R:±PrintGCSummary Print summary GC information after application main method returns. Default: - (disabled). | |
| -R:±PrintGCTimeStamps Print a time stamp at each collection, if +PrintGC or +VerboseGC. Default: - (disabled). | |
| -R:±PrintGCTimes Print the time for each of the phases of each collection, if +VerboseGC. Default: - (disabled). | |
| -R:PrintGraph=File Where IdealGraphVisualizer graph dumps triggered by Dump or DumpOnError should be written. [Extra help available] | |
| -R:±PrintGraphFile Setting to true sets PrintGraph=file, setting to false sets PrintGraph=network. Default: + (enabled). | |
| -R:PrintGraphHost="127.0.0.1" Host part of the address to which graphs are dumped. | |
| -R:PrintGraphPort=4445 Port part of the address to which graphs are dumped in binary format. | |
| -R:±PrintGraphWithSchedule Schedule graphs as they are dumped. Default: - (disabled). | |
| -R:±PrintHeapShape Print the shape of the heap before and after each collection, if +VerboseGC. Default: - (disabled). | |
| -R:±PrintIRWithLIR Print HIR along side LIR as the latter is generated. Default: - (disabled). | |
| -R:±PrintImageObjectTree Print image object hierarchy. Default: - (disabled). | |
| -R:±PrintLIRWithAssembly Include the LIR as comments with the final assembly. Default: - (disabled). | |
| -R:±PrintPointsToStatistics Report analysis statistics. Default: - (disabled). | |
| -R:±PrintProfilingInformation Print profiling information when parsing a method's bytecode. Default: - (disabled). | |
| -R:±PrintSynchronizedAnalysis Print types used for Java synchronization. Default: - (disabled). | |
| -R:±PrintUnmodifiedGraphs Dump a graph even if it has not changed since it was last dumped. Change detection is based on adding and deleting | |
| nodes or changing inputs. Default: + (enabled). | |
| -R:±ProfileAllocations Enable profiling of allocation sites. Default: - (disabled). | |
| -R:ProfileAllocationsContext=AllocatingMethod | |
| Control the naming and granularity of the counters when using ProfileAllocations. [Extra help available] | |
| -R:±ProfileAnalysisOperations Track the progress of the static analysis. Default: - (disabled). | |
| -R:±ProfileCompiledMethods Default: - (disabled). | |
| -R:±ProfileConstantObjects Track the creation of constant objects. Default: - (disabled). | |
| -R:±ProfileMonitors Enable profiling of monitor operations. Default: - (disabled). | |
| -R:±RawConditionalElimination Default: + (enabled). | |
| -R:ReadEliminationMaxLoopVisits=5 | |
| -R:±ReassociateExpressions Re-associate loop invariants and constants. Default: + (enabled). | |
| -R:±ReduceDCE Disable optional dead code eliminations. Default: + (enabled). | |
| -R:RegisterPressure=... Comma separated list of registers that register allocation is limited to. Default: None | |
| -R:±RelaxTypeFlowStateConstraints Allow a type flow state to contain types not compatible with its declared type. Default: + (enabled). | |
| -R:±RemoveNeverExecutedCode Default: + (enabled). | |
| -R:±RemoveSaturatedTypeFlows Enable the type flow saturation analysis performance optimization. Default: + (enabled). | |
| -R:±ReplaceInputsWithConstantsBasedOnStamps Default: + (enabled). | |
| -R:SafepointPromptnessFailureNanos=0 Exit the VM if I can not come to a safepoint in this many nanoseconds. 0 implies forever. | |
| -R:SafepointPromptnessWarningNanos=0 Print a warning if I can not come to a safepoint in this many nanoseconds. 0 implies forever. | |
| -R:±SamplingBasedProfiling Allow sampling-based profiling. Default: disabled in execution. Default: - (disabled). | |
| -R:±ScanObjectsParallel Object scanning in parallel. Default: + (enabled). | |
| -R:ShowConfiguration=none Writes to the VM log information about the compiler configuration selected. | |
| -R:±ShowDumpFiles Print the name of each dump file path as it's created. Default: - (disabled). | |
| -R:±ShowSubstitutionSourceInfo Controls whether the source position information of snippets and method substitutions are exposed to HotSpot. Can be | |
| useful when profiling to get more precise position information. Default: - (disabled). | |
| -R:±SimpleFastInflatedLocking Handle simple cases for inflated monitors in the fast-path. Default: + (enabled). | |
| -R:SmallCompiledLowLevelGraphSize=330 If the previous low-level graph size of the method exceeds the threshold, it is not inlined. | |
| -R:±SnippetCounters Enable counters for various paths in snippets. Default: - (disabled). | |
| -R:SpectrePHTBarriers=None Select a strategy to mitigate speculative bounds check bypass (aka Spectre-PHT or Spectre V1). [Extra help available] | |
| -R:±SpectrePHTIndexMasking Mask indices to scope access to allocation size after bounds check. Default: - (disabled). | |
| -R:±SpeculativeGuardMovement Move loop invariant guards (e.g., array bounds checks) out of loops. Default: + (enabled). | |
| -R:StackSize=0 The size of each thread stack at run-time, in bytes. | |
| -R:StartFlightRecording="" Start flight recording with options. | |
| -R:±StressExplicitExceptionCode Stress the code emitting explicit exception throwing code. Default: - (disabled). | |
| -R:±StressInvokeWithExceptionNode Stress the code emitting invokes with explicit exception edges. Default: - (disabled). | |
| -R:±StressTestEarlyReads Stress the code by emitting reads at earliest instead of latest point. Default: - (disabled). | |
| -R:±StrictDeoptInsertionChecks Perform checks that guards and deopts aren't introduced in graphs that should handle exceptions explicitly. Default: - | |
| (disabled). | |
| -R:StringIndexOfConstantLimit=4096 String.indexOf invocations will be evaluated at compile time if the receiver is a constant and its length is smaller | |
| than this value. | |
| -R:±SupportJsrBytecodes Default: + (enabled). | |
| -R:±SupportOSRWithLocks Support OSR compilations with locks. If DeoptAfterOSR is true we can per definition not have unbalanced enter/exits | |
| mappings. If DeoptAfterOSR is false insert artificial monitor enters after the OSRStart to have balanced enter/exits in | |
| the graph. Default: + (enabled). | |
| -R:TearDownFailureNanos=0 The number of nanoseconds before tearing down an isolate gives a failure message. 0 implies no message. | |
| -R:TearDownWarningNanos=0 The number of nanoseconds before and between which tearing down an isolate gives a warning message. 0 implies no | |
| warning. | |
| -R:Time=... Pattern for specifying scopes in which timing is enabled. See the Dump option for the pattern syntax. An empty value | |
| enables all timers unconditionally. Default: None | |
| -R:TimedDynamicCounters=-1 Turn on the benchmark counters, and displays the results every n milliseconds. | |
| -R:Timers=... Comma separated names of timers that are enabled irrespective of the value for Time option. An empty value enables all | |
| timers unconditionally. Default: None | |
| -R:TraceBytecodeParserLevel=0 The trace level for the bytecode parser. A value of 1 enables instruction tracing and any greater value emits a frame | |
| state trace just prior to each instruction trace.Instruction tracing output from multiple compiler threads will be | |
| interleaved so use of this option make most sense for single threaded compilation. The MethodFilter option can be used | |
| to refine tracing to selected methods. | |
| -R:±TraceCodeCache Print logging information for runtime code cache modifications. Default: - (disabled). | |
| -R:±TraceDeoptimization Print logging information for every deoptimization. Default: - (disabled). | |
| -R:±TraceDeoptimizationDetails Print verbose logging information for every deoptimization. Default: - (disabled). | |
| -R:±TraceEscapeAnalysis Default: - (disabled). | |
| -R:±TraceExceptionHandlerStub Trace execution of stub used to handle an exception thrown by a callee. Default: - (disabled). | |
| -R:±TraceHeapChunks Trace heap chunks during collections, if +VerboseGC and +PrintHeapShape. Default: - (disabled). | |
| -R:±TraceInlineDuringParsing Traces inlining performed during bytecode parsing. Default: - (disabled). | |
| -R:±TraceInlining Enable tracing of inlining decisions. Default: - (disabled). [Extra help available] | |
| -R:±TraceInliningForStubsAndSnippets Enable inlining decision tracing in stubs and snippets. Default: - (disabled). | |
| -R:TraceLIRGeneratorLevel=0 The trace level for the LIR generator. | |
| -R:TraceMonitorsMethodFilter=... Trace monitor operations in methods whose fully qualified name contains this substring. Default: None | |
| -R:TraceMonitorsTypeFilter=... Trace monitor operations on objects whose type contains this substring. Default: None | |
| -R:±TraceParserPlugins Traces use of plugins during bytecode parsing. Default: - (disabled). | |
| -R:±TraceUnwindStub Trace execution of the stub that routes an exception to a handler in the calling frame. Default: - (disabled). | |
| -R:±TrackAccessChain Track the callers for methods and accessing methods for fields. Default: - (disabled). | |
| -R:±TrackInputFlows Track the input for type flows. Default: - (disabled). | |
| -R:TrackMemUse=... Pattern for specifying scopes in which memory use tracking is enabled. See the Dump option for the pattern syntax. An | |
| empty value enables all memory use trackers unconditionally. Default: None | |
| -R:±TrackNodeInsertion Track source stack trace where a node was inserted into the graph. Default: - (disabled). | |
| -R:±TrackNodeSourcePosition Track the NodeSourcePosition. Default: - (disabled). | |
| -R:TrivialInliningSize=10 Graphs with less than this number of nodes are trivial and therefore always inlined. | |
| -R:TruffleCompilerConfiguration=... Select a compiler configuration for Truffle compilation (default: use Graal system compiler configuration). Default: | |
| None | |
| -R:±TruffleHostInlining Whether Truffle host inlining is enabled. Default: + (enabled). | |
| -R:TruffleHostInliningBaseBudget=5000 Maximum budget for Truffle host inlining for runtime compiled methods. | |
| -R:TruffleHostInliningByteCodeInterpreterBudget=100000 | |
| Maximum budget for Truffle host inlining for runtime compiled methods with a BytecodeInterpreterSwitch annotation. | |
| -R:TruffleHostInliningMaxExplorationDepth=1000 | |
| Determines the maximum call depth for exploration during host inlining. | |
| -R:±TruffleHostInliningPrintExplored When logging is activated for this phase enables printing of only explored, but ultimately not inlined call trees. | |
| Default: - (disabled). | |
| -R:±TrustFinalDefaultFields Determines whether to treat final fields with default values as constant. Default: + (enabled). | |
| -R:TypeCheckMaxHints=2 The maximum number of profiled types that will be used when compiling a profiled type check. Note that | |
| TypeCheckMinProfileHitProbability also influences whether profiling info is used in compiled type checks. | |
| -R:TypeCheckMinProfileHitProbability=0.5 If the probability that a type check will hit one the profiled types (up to TypeCheckMaxHints) is below this value, the | |
| type check will be compiled without profiling info. | |
| -R:TypeFlowSaturationCutoff=20 The maximum number of types recorded in a type flow. -1 indicates no limitation. | |
| -R:±UnresolvedIsError Report unresolved elements as errors. Default: + (enabled). | |
| -R:UnrollMaxIterations=16 | |
| -R:±UseBranchesWithin32ByteBoundary Force branch instructions to align with 32-bytes boundary, to mitigate the jcc erratum. See | |
| https://www.intel.com/content/dam/support/us/en/documents/processors/mitigations-jump-conditional-code-erratum.pdf for | |
| more details. If not set explicitly, the default value will be determined according to the CPU model. Default: - | |
| (disabled). | |
| -R:±UseCompilationStatistics Enables CompilationStatistics. Default: - (disabled). | |
| -R:±UseExceptionProbability Default: + (enabled). | |
| -R:±UseGraalStubs Use Graal-generated stubs for complicated LIR operations instead of embedding all the emitted code. Default: + | |
| (enabled). | |
| -R:±UseLoopEndFrequencies Derive loop frequencies only from backedge frequencies instead of from loop exit frequencies. Default: - (disabled). | |
| -R:±UseLoopLimitChecks Default: + (enabled). | |
| -R:±UseSnippetGraphCache Use a cache for snippet graphs. Default: + (enabled). | |
| -R:±UseSnippetTemplateCache Use a LRU cache for snippet templates. Default: + (enabled). | |
| -R:±UseTrappingNullChecks Use traps for null checks instead of explicit null-checks. Default: + (enabled). | |
| -R:±UseTypeCheckHints Default: + (enabled). | |
| -R:±VerboseGC Print more information about the heap before and after each collection. Default: - (disabled). | |
| -R:Verify=... Pattern for specifying scopes in which logging is enabled. See the Dump option for the pattern syntax. Default: None | |
| -R:±VerifyBalancedMonitors Emit extra code to dynamically check monitor operations are balanced. Default: - (disabled). | |
| -R:±VerifyGraalGraphEdges Perform expensive verification of graph inputs, usages, successors and predecessors. Default: - (disabled). | |
| -R:±VerifyGraalGraphs Verify graphs often during compilation when assertions are turned on. Default: + (enabled). | |
| -R:±VerifyGraalPhasesSize Verify before - after relation of the relative, computed, code size of a graph. Default: - (disabled). | |
| -R:±VerifyHeapAtReturn Perform platform dependent validation of the Java heap at returns. Default: - (disabled). | |
| -R:±VerifyKillCFGUnusedNodes Verify that there are no new unused nodes when performing killCFG. Default: - (disabled). | |
| -R:±VerifyPhases Default: - (disabled). | |
| -R:±WarnMissingIntrinsic Print a warning when a missing intrinsic is seen. Default: - (disabled). | |
| -R:±WriteableCodeCache Allocate code cache with write access, allowing inlining of objects. Default: - (disabled). | |
| -R:±ZapStackOnMethodEntry Default: - (disabled). | |
| ``` |
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